ays-engineering

Xyloscan: 3D Surface Mapping for Bulk Storage Silo

aysengrg@ays-eng.com (AYS Engineering) — Mon, 30 Aug 2021 14:33:29 GMT

AUMUND takes over KoWey Aftersales Service

Mon, 26 Jul 2021 07:28:13 GMT

With effect of 30 June 2021, KoWey GmbH & Co. KG, Kamp-Lintfort (Germany) has ceased its business operations worldwide.

AUMUND Fördertechnik GmbH takes over the After Sales Service from KoWey (Germany) and from KCT Engineering (India) on all machinery including original spare parts, retrofits and conversions and site services with regards to the bucket elevators and conveying systems supplied worldwide.

AUMUND PREMAS® Services for preventive and predictive maintenance are highly recommended for all installed KoWey machines to check on the operating and machine conditions to avoid premature equipment breakdown, causing production disruption. For further support or information, all former KoWey customers are invited to contact us for further details.

AUMUND: PREMAS 4.0 Predictive Maintenance Solution

Sat, 08 May 2021 14:40:26 GMT

Predictive Maintenance Solution for Conveying Technology

AUMUND introduces the Predictive Maintenance Solution, PREMAS® 4.0 to further enhance its service support to customers. Reactive or insufficient maintenance often leads to unplanned stops, high maintenance costs and huge losses due to production halts. This can be avoided by having a predictive maintenance system in which, the system could predict potential failures that the plant users can rely on for uninterrupted operation and maximum production. AUMUND now would be able to extend the proven physical inspections by introducing the all-new online monitoring system named PREMAS® 4.0 Predictive Maintenance Solution.

PREMAS® 4.0 could provide early detection of wear and aging of important machine components to the plant operators. The latest sensor technologies are combined with real-time data acquisition and analysis to enable permanent online condition monitoring of the machine on any mobile device. In addition to the condition of the machine, PREMAS® 4.0 also provides an estimation of the remaining service life of critical machine components.

The Predictive Maintenance Solution is specially made for conveying equipment in the heavy industry. Every machine receives a hardware package. Provided field sensors as well as some existing signals from the plant control system (motor current, level switch, speed switch, drift warning) will be connected to the IoT Box, which sends the collected data through mobile connectivity to the PREMAS® Cloud. There, the data will be analyzed based on the latest technologies for predictive analytics (e.g. algorithms, machine learning …). The PREMAS® Portal visualizes and provides all relevant data for a complete online condition monitoring, securely online accessible to authorized users 24/7 through any mobile or desktop device.

New Generation STORMAJOR® combines SAMSON Mobile Material Feeder with Outloading Boom

Fri, 12 Mar 2021 07:50:14 GMT

AUMUND Asia Ltd, located in Hong Kong China, is acting in the Asia Pacific Area and sells AUMUND, SCHADE and SAMSON equipment in all kinds of key industries such as Cement, Mining & Minerals, Chemical and Fertilizer Industry, Ports & Terminals and many others more. Synergies within the AUMUND Group of companies consistently lead to successful outcomes: In May 2020 AUMUND Hong Kong won an order from PT Asahimas Chemical, Java/Indonesia, for the New Generation of STORMAJOR®. The project was technically supported by SAMSON Materials Handling Ltd/UK leading product company in the AUMUND Group for mobile bulk handling solutions. The pre-assembly of the STORMAJOR® takes place in the workshops of AUMUND Foerdertechnik GmbH, Rheinberg/Germany. The delivery is planned for December 2020.

New Generation STORMAJOR® with Outloading Boom

(drawing and pre-assembly AUMUND Foerdertechnik GmbH)

The new designed STORMAJOR® is the combination of a Mobile SAMSON Material Feeder and an Outloading Boom, both mounted on the same chassis. The diverse options for stockpiling and loading offered by the STORMAJOR®were the compelling factor in the order from PT Asahimas Chemical, a company which operates several chemical production plants in Cilegon in Banten Province, Java, Indonesia. In 2018 it built its own power plant, where the first New Generation STORMAJOR® will operate, serving an important purpose in minimising spontaneous combustion of coal by stockpiling the coal externally and bringing it back inside once it has cooled down.

Challenge: Danger of smouldering coal fires caused by glowing nests

PT Asahimas Chemical is concerned about embedded hot bodies, which occur frequently causing the coal to catch fire in covered storage areas of the power plant. Currently the glowing nests are removed with diggers from the stockpiled coal and transferred to an external storage area about 50 m away by dump trucks, where the coal is left to cool down before being taken back into the covered storage areas using the same diggers and dump trucks.

The new generation of STORMAJOR®both simplifies and speeds up the process of moving the coal. The machine is placed centrally between the stockpile and the covered storage area, from where it can both receive the coal from the diggers and stockpile it outside the covered storage area via the STORMAJOR®Outloading Boom. When the coal has cooled down the STORMAJOR® turns in the opposite direction, receiving the coal back from the digger and transporting it back into the covered storage area. This new process of utilising the STORMAJOR® also decreases the amount of times the coal has to be handled, which reduces the material degradation keeping the quality of the coal intact, whilst operating at 300 tonnes per hour. The STORMAJOR®therefore increases the efficiency and productivity of the complete process cycle.

PT Asahimas Chemical selected a 450 Series STORMAJOR®, which is the medium-sized model, for its operation in Indonesia. The bucket capacity for material discharge is approximately 4.5 t and a conveying length of 11.5 m.The Outloading Boom is 27 m long, has a luffing range from 2 to 30 degrees and a slewing range of 80 degrees (40 degrees in each direction). ThisSTORMAJOR® forms stockpiles of up to 11.75 m in height

AUMUND delivers SAMSON Eco Hopper EH 45 and EH 60 worldwide

Fri, 12 Mar 2021 07:05:05 GMT

Cost-effective and short delivery time. From now AUMUND Machinery Technology (Beijing) Ltd offers worldwide two types of SAMSON Eco Hoppers designed on a new economical and technical concept by saving all advantages and benefits of the product. The standardization of the Eco Hopper type EH45 (inlet 4.5x4.5m) and type EH60 (inlet 6.0x6.0m), available on rails, wheeled or fixed, enables a more effective assambling of the components, a lower price level and shorter delivery times. EH 45 and EH 60will be produced in China and can be ordered worldwide from AUMUND China directly.

The SAMSON Eco Hopper series applies a variety of dust and environmental control technologies, such as crosswind turbulence reduction system, Flex-Flap dust seal system, integral cartridge dust filter Units, etc. It is an economical and ecologically sensitive solution fulfilling all needs for the efficient import of dry bulk cargoes. The Hoppers are designed to suit the characteristics and flow properties of virtually any bulk material such as Clinler, Bauxite, Limestone, Iron Ore, Gypsum, Slag, Coal, and many others. Rates to 3000 tons per hour may be achieved subject to the grab crane performance. The open size and height of top shroud, the angle of lower hopper, the thickness and the type of wear material are all customized for the client’s specific product and process.

Eco Hopper Overall Dimensions

Effective Dust Control Technologies

Top Shroud - Crosswind Turbulence Reduction System

The Eco Hopper includes a top shroud designed to allow for the crane Grabs to be lowered within the reception area before opening. This system is designed to reduce the wind turbulence above and within the Inlet Shroud which is commonly caused by cross winds. As a result this system reduces the filtration airflow requirements

SAMSON Flex-Flap System - One-way Non-return Valve System

The Flex-Flap was first developed by AUMUND based on the Burnley Baffle principle, which is a mechanism similar to a one-way non-return valve composed of steel and rubber, and used to reduce the volume of air necessary to control dust from the opening grab and displaced air from material falling into the inner hopper below.

Cartridge Dust Filter Units – Efficient and Compact Dust Collector

The SAMSON Eco Hopper employs a fully integrated dust filtration suction system operating below the inlet grating for fugitive dust control. Individual dust filter units are integrated into three sides of the Hopper only. The highly efficient SAMSON Eco Hopper design means that the waterside of the Hopper (closest to the vessel) does not require a filter unit. This feature means that the SAMSON Eco Hopper is extremely compact and offers:

A reduced distance for the grab to travel
Resulting in faster grab cycle times
Reduced grab operating costs

Discharge Options

To Client‘s Belt directly

Discharge from the Eco Hopper may be direct to a belt conveyor for a fixed installation. In this case the bulk material is reclamed by a gravity discharge unit (rod gate) which permits to feed the material onto the conveyor at the requseted output rate.

With Extraction Conveyor

The SAMSON Eco Hopper can be mounted onto tracks to match the mobile crane on some ports. In this case a separate extraction conveyor integrated on the Hopper is often equipped. The conveyor can be designed for single or bi-directional discharging according to the client‘s material handling process and the layout of the quay belt conveyor.

Structure of the Product Number

Plant report: BIGBOSS Cement, Philippines

Fri, 12 Mar 2021 06:28:29 GMT

Global Cement speaks to BIGBOSS Cement’s Ishmael Ordonez about the company’s background, its unusual production process and local market conditions, with a focus on its recently-commissioned Gebr. Pfeiffer ready2grind modular grinding system.

Ishmael Ordonez is Senior Vice President for Administration at BIGBOSS Cement. He joined the company in 2017. He was previously also responsible for operations, including the project to construct the company’s plant in Porac. Prior to BIGBOSS Cement, he worked in the beverage and pharmaceutical sectors and, most recently, as Chief Administration Officer for International Care Ministries, a non-governmental organisation that cares for the poorest in Filipino society.

Global Cement (GC): Please could you introduce BIGBOSS Cement?

Ishmael Ordonez (IO): BIGBOSS Cement is a 100% Filipino-owned producer of cementitious materials that was established in 2017. It was named after the ultimate Big Boss, God Almighty, and is dedicated to carrying out the work of Jesus Christ on Earth. The major shareholder is Henry Sy Jr.

GC: Can you expand on the founding and development of the company?

IO: Henry Sy Jr. is co-vice chairman of SM Investments, a major conglomerate in the Philippines. He also serves as chairman of SM Prime, the group’s property arm, which has interests in malls, residences, offices, hotels and convention centres. Due to the continued strong demand for such facilities in the Philippines, he decided to develop captive cement production capacity. BIGBOSS Cement is the result of that dream. The plant itself is located in Porac, in Pampanga, Luzon. It is around 100km north of Manila, the capital of the Philippines, in the north of the country. It uses an unusual production process that makes use of a volcanic material, lahar, which resulted from a major eruption of the nearby Mount Pinatubo in 1991. The lahar is a very siliceous material that is found at the surface in a 25mthick layer. It extends for many square kilometres in the area surrounding the plant. The lahar is the primary ingredient for BIGBOSS’ cement. It is mainly SiO2 and, if you analyse it using X-ray diffraction (XRD) it bears a strong resemblance to cement clinker. However, as it lies in the ground, the lahar is not activated. This is why our President and key innovator, Eng. Gilbert Cruz, developed a patent-pending process that activates this material, turning it cementitious.

GC: How does the BIGBOSS process differ from conventional cement production?

IO: You can think of the BIGBOSS Cement plant as being somewhere between a conventional integrated facility and a grinding plant. This is because there is a low-temperature heating step. In this patent-pending process, the lahar is heated to above 200°C in a diesel-fired chamber. This activates the material, converting it to what we term Granulated Activated Sand by Heating (GASH).

The G ASH, plus some imported clinker, gypsum, limestone and slag, are then ground in our three mills. There are two ball mills from a Chinese supplier. These have a shared capacity of 110t/hr and came online in 2018 and 2019 respectively. The third is a 70t/hr modular ready2grind vertical roller mill from Gebr. Pfeiffer, which was commissioned in December 2020. These three mills combine to produce around 4320t/day (1.4Mt/yr) of low-clinker cement.

GC: How do you distribute these products?

IO: We have two bagging lines, a Chinese one for the two Chinese mills and a Haver & Boecker line for the ready2grind mill. They pack the products into 40kg bags, which are sold to hardware stores via our sales team and a network of dealers. This is how we have chosen to enter the market. We are helped by the green credentials of our products, which emit around half the CO2 per tonne as conventional cement products.

With the resources at his disposal, Henry Sy Jr. could have simply bought another cement producer. There have been plenty of opportunities to do so in the Philippines recently. However, he was looking to enter a niche, while also doing some good. Indeed, our company motto is ‘Green is Good.’ The less clinker the better.

The crater lake at the top of Mount Pinatubo. The volcano, which erupted in 1991, is a source of lahar, the main raw material used by BIGBOSS Cement.

The ready2grind system comes largely pre-assembled, resulting in lower installation times.

GC: Why did BIGBOSS decide to change supplier for the third mill?

IO: When we decided to expand the plant, we also wanted to ‘level up.’ Gebr. Pfeiffer is a long-standing company in the cement mill business, with an incredible history and reference list. It dealt with us directly, not via a third party and shared our enthusiasm to develop the Philippines.

The ready2grind modular mill concept was chosen due to its short construction time. We had estimated that the new mill would be commissioned within eight months of the start of civil works, but restrictions surrounding the Covid-19 pandemic ultimately extended this to around 12 months.

GC: How do you distribute these products?

IO: The contract was signed in mid 2019 and civil works started in early 2020. The machinery was installed in mid 2020 and cold commissioning began in October 2020. Hot commissioning took place in late November 2020 and the ready2grind mill was fully up and running in early December 2020.

As I mentioned, there were some delays due to the pandemic. However, we were still able to receive parts during the spring and summer as the government classified projects such as this as ‘essential.’

GC: Were there any issues during commissioning and how were they overcome?

IO: The inability for Gebr. Pfeiffer’s experts to travel between Europe and the Philippines was a major reason for the delays I mentioned in my answer above. BIGBOSS and its local partners had to undertake parts of the project with Gebr. Pfeiffer assisting from a distance. Online meetings have been a big help in this regard. A lot of pictures were sent back and forth to Germany. In late November 2020, Gebr. Pfeiffer’s team were finally able to travel to the Philippines to assist with final commissioning and start-up. We are grateful for a fruitful collaboration and were able to keep going with the project during a difficult period.

GC: What are the differences between grinding G ASH with a ball mill compared to a vertical roller mill?

We grind our products to a fineness of around 4200cm2/g according to Blaine. However, the G ASH is easier to grind than clinker. In a ball mill this means that the different components have a tendency to separate as they progress through the mill.

However, due to the nature of a vertical roller mill, this effect is significantly diminished. We worked closely with Gebr. Pfeiffer to ensure that we developed a mill that was capable of 70t/hr

GC: What’s next for BIGBOSS Cement?

IO: BIGBOSS has plans to enter the bulk distribution market, either via packing in Big Bags or via bulk road tankers. The silos and systems are in place, as this has always been part of our long-term plan. However, to enter the bulk sector, we need to optimise our formulation to achieve a higher compressive strength. The bagged formulations currently reach 24-28MPa after 28 days. To be used in bulk projects, we need to achieve more than 40MPa. It is something we are working on right now.

We are also thinking about the next plant(s). Manila is a good source of customers and so we are looking to cover the market to the south, around Batangas. We are also looking at locations for plants further north in Luzon. We will very strongly consider Gebr. Pfeiffer as a supplier for these plants. Beyond this, we have longer-term plans to build plants in the Visayas and Mindanao regions, in central and southern Philippines respectively

GC: Would these plants also be based on the G ASH process?

IO: We would again intend to use volcanic residues as the main raw material at any future plant. These are available in many locations within the Philippines due to the high levels of volcanic activity.

GC: Is the Philippines still Build Build Building?

IO: The government’s Build Build Build programme was hampered by the Covid-19 pandemic in 2020. However, there is a strong underlying drive for major new roads and infrastructure projects, housing developments and so on, with some improvement in the market since September 2020. This is thanks to the adoption of new working protocols, which have enabled a return to some kind of normality. Construction workers are now tested for Covid-19 and wear PPE on site, for example.

GC: How have sales changed since the plant was established?

IO: The plant only began to sell products at the end of 2018, so there has only been one full ‘normal’ year in the history of the company - 2019. Obviously, construction work was limited at points during 2020 due to limits on the number of workers allowed on worksites.

GC: How was production at the plant affected?

IO: Parts of 2020 were very difficult. We were forced to close the plant for a period in March and April due to a government mandate. However, we successfully put forward a case to grind our remaining clinker stocks, which otherwise would have spoiled. This was done using a skeleton staff.

We also had to lockdown the plant. During this period, the plant was in operation but nobody could enter or leave. Of our 200 staff, 100 were on site and 100 were off site. We provided necessary provisions, accommodation and a hardship allowance to those on site and a retention allowance to those not able to work. The corporate team was able to work from home in most cases, with the occasional visit to our head office in Manila

GC: What are the biggest future challenges for BIGBOSS Cement?

IO: We are somewhat reliant on imported raw material costs, particularly clinker. It is possible that these could rise in the future. That said, we could adapt our blend to use no clinker. The resulting product would be able to meet the same strength as we do at present. However, it would not be classified as a commonly recognized cement blend, which might represent a commercial downside. As the user of a the captive bunker-fuel-fired power plant, we are also exposed to changes in international prices.

Imported cement, mainly from China and Vietnam, is also a threat to some extent. The market needs this imported material at present, and so as long as the government maintains appropriate import tariffs, importers will continue to complement, rather than threaten domestic producers

GC: What is the biggest opportunity for the company?

IO: BIGBOSS Cement has huge potential to expand to other areas of the country. On top of the government’s Build Build Build programme, there is rising cement demand from the 105 million people that call the Philippines home. Small housing projects, schools, hospitals and commercial spaces are all required, which will benefit all cement producers. As a young and green producer of cementitious products, BIGBOSS Cement is well positioned to leverage existing trends to expand rapidly in the coming years.

GC: Thank you. We look forward to following BIGBOSS Cement as it grows.

IO: You are very welcome indeed.

MPS mills for coal grinding

Fri, 12 Mar 2021 02:26:37 GMT

1 Introduction

Two mill systems are employed for most coal grinding applications in the cement industry. These are, on the one hand, vertical roller mills (VRM) that have achieved a share of almost 90% and, on the other hand, ball mills whose share decreased to just over 10%.

Gebr. Pfeiffer SE supplies stand-alone MPS coal grinding mills as well as complete coal grinding-drying systems. Both mill and grinding system can be operated under pressure or suction as well as under air or inert gas atmosphere. System configurations cover grinding plants with temporary storage of the pulverized coal in silos (for cement plants, or in blast-furnaces for steel plants, etc.) and installations with direct injection into the combustion system (for power generating plants). For over 40 years, the MPS mills for power stations have been manufactured under license of Hitachi Power Europe GmbH (formerly Babcock Borsig AG), headquartered in Oberhausen, Germany. .

2 Design features of MPS mills for coal grinding

Depending on the material to be ground, throughput rates of 5-200 t/h can be achieved in a fineness range between 1% R0.063 mm and 25% R0.090 mm. Thus, the MPS coal grinding mill device for fresh material is arranged in this area where the fresh feed is also mixed with the grits rejected from the classifier (Figure 1). The main difference of an MPS mill for solid fuels to other MPS mills lies in its pressure-shock resistance. Mill and classifier housing, feed unit and expansion joints are designed to be pressure-shock resistant. To avoid accumulations of coal dust as a source of spontaneous combustion all surfaces in the grinding and classifying zone are vertically oriented or at least steeply inclined.

The key features of a coal grinding plant in a cement works are:

special layout of the plant to avoid coal dust deposits
pressure-shock resistant design of mill and classifier housing, filter and pulverized coal silos
use of rapid action flaps, rupture disks and explosion vents in certain parts of the plant
monitoring of O2, CO and dust concentration levels in critical places
supply of CO2in the event of safety-relevant limit values being exceeded
reducing the O2concentration level in the dust-laden gases to 8-12% by using exhaust gas from the rotary kiln, if possible, and by minimizing the amount of false air
automated linking of all safety-relevant data and process control features of the entire plant

3 Legal basis and plant layout

The European Directive 94/9EG dated 23.04.1994 (ATEX) defines basic health and safety requirements relating to non-electric equipment intended for use in areas with danger of explosion. This applies to the protection of workers against risks with a high drying capacity is very suitable for grinding lignite with feed moistures of as much as 45%. Depending on this high feed moisture the mill rating is determined by the drying process whereas for anthracite, hard coal and petcoke the rating of the mill is determined by the grinding process. The great variety of solid fuel properties, such as grindability, ash content, volatiles as well as the required product fineness, calls for a wide range of operating states. The hydropneumatic tension system allows the stepless adjustment of roller force to suit the wide range of solid fuel feed materials. In combination with the adjustable air

flow rate the mill control range is between 30 and 100%. Part-load operation may become necessary as a result of load variations in injection-type grinding mills installed in power plants, changing fuel qualities and a grindability other than that specified in the design criteria for the mill.

The MPS vertical roller mill is characterized by its statically determinate system which consists of the pressure frame, the 3 rollers and the 3 external pull rods and ensures that the load is uniformly distributed to the grinding table. The grinding table is driven via an electric motor and a gearbox. During start-up and maintenance the rollers can be lifted by tensioning cylinders.

A high-efficiency classifier of the type SLS is mounted above the grinding zone. The feeding arising from the use of equipment and protective systems in potentially explosive atmospheres. The range of member states includes EU-countries, EFTA-countries (e.g. Norway, Switzerland) and countries with special agreements (such as Turkey). The ATEX requirements apply not only to the mill but also to the components supplied along with such as for example rotary feeders or safety dampers. In particular the protective systems, e.g. the quick-acting damper, have to comply with the requirements listed in this directive. The requirements are based on the zone classification specified for the individual plants.

The grinding plant may be operated under non-inert conditions, when grinding low explosive coal types. With non-inert operation exhaust air from the clinker cooler could be used for drying the coal. As a common safety precaution the coal grinding system is operated under inert conditions. This can be achieved by using exhaust gases from the kiln preheater in a cement plant. Figure 2 shows a general plant layout. The coal is fed into the mill through a pressure shock-resistant, self-purifying rotary feeder. After being dried, ground and classified in the mill system, the finished product extracted from the classifier is collected in a bag filter, discharged via screw conveyors and a rotary feeder. The product is then conveyed pneumatically to the coal intermediate silo. Quick-acting dampers are installed in the gas ducts before and after the mill, serving as a safety system in addition to the mill, filter and silo being rendered inert with CO2. The filter and silos are equipped with pressure relief valves to vent the shock wave and to release possible flames into the atmosphere in case of an explosion. Measurements of CO, O2 and dust are taken downstream of the filter for monitoring the grinding plant. CO and temperature are monitored in the pulverized coal silo. If the preset limits of CO and O2 concentration are reached, the safety systems, such as safety dampers, CO2 inertization of the mill, filter and silo are activated.

4 Rating of MPS mills for coal grinding

The most reliable and comprehensive basis for layout and design is provided by pilot-scale grinding tests of the project-relevant materials. At the GPSE test station, extensive test series with the semi-industrial mill type MPS 40 B (refer to Figure 3) are conducted for the grinding of different solid fuels to determine the basic rating data. With this mill, a pilot plant is available that can be used for the determination of solid fuel material characteristics and project-related data, i.e. specific power consumption, gas volume requirements and specific wear rate. Significant differences occur in material properties and specific mill performance data between the different solid fuels such as anthracite, hard coal, lignite and petcoke. Even within a single fuel type the deviation is quite high for grindability, ash content, volatiles, moisture and abrasiveness. The layout and design of a grinding system for solid fuels with low to medium moisture contents is generally determined by grinding, whereas the mill rating for lignite with feed moistures of up to 45% is determined by drying.

An alternative to a grinding test performed in a pilot plant with an MPS 40 B is the well-known Hardgrove grindability procedure (refer to Figure 4). The Hardgrove Index gives less information than a grinding test in a pilot plant provides. The specific wear rate for predicting the lifetime of roller tires can – by performing a Hardgrove Index – only be based on assumptions. The small quantity of material used for the test requires the highest precision during the sampling procedure. Despite all constraints a resilient correlation between Hardgrove indices and MPS mill throughputs has been released for mill rating. Only in lignite grinding a precise design has to be based on a grinding test in the pilot plant.

Industry

5 Operating references

More than 1000 MPS mills are in use for grinding various types of solid fuels (lignite to petcoke), including different types of hard coal and anthracite all over the world. Table 1 shows the distribution of MPS mills in different industries exemplarily for the years 1990 to 2013. More than 75% of them are installed in the cement industry, 20% in the steel industry and a small part is established in specialized industrial sectors (e.g. zinc melting plant).

Over the years the mill sizes ordered have become larger due to changed market requirements. So far, the biggest mill for lignite coal grinding will be delivered to Cemindo’s Bayah plant in Indonesia. This MPS 4500 BK has been ordered for grinding lignite with a maximum moisture of 37% and it is able to produce a throughput rate of minimum 100 t/h at a residue of 15% R0.09 mm. The installed power for the mill main drive is 1300 kW. The specific energy consumption is set at 11.4kWh/t for the main mill drive plus theseparator rotor drive. Delivery time is 12 months, so the mill will be commissioned in late autumn 2014.

Commissioning of many coal mills is currently in progress.

In the Ukraine an MPS 200 BK for coal grinding was commissioned in early 2013. All performance warranties were fulfilled. The warranties were based on a Hardgrove index of 40, the performance tests were performed with a coal/anthracite mix with a Hardgrove index of about 65 which caused a 40% higher throughput (21.2 t/h vs. 15.0 t/h) at a lower specific energy consumption (6 kWh/t vs. 15 kWh/t).

An MPS 3070 BK installed in India produces 64 t/h of hardcoal with a fineness of 10.8% R0.090 mm. The hardcoal has a Hardgrove index of 61. The specific wear rate for the roller parts (made of chromium cast alloy) was shown to be nearly 25 g/t.

Petcoke with a Hardgrove index of 35 is ground in an MPS 250 BK (refer to Figure 5). This mill is installed in the US and in operation since 2002. The production rate is 24 t/h with a power consumption of 16.8 kWh/t at a fineness of 5% R0.090 mm. As second product coal is ground to 8.5% R0.090 mm with a production rate of 34 t/h and 7.3 kWh/t specific energy consumption for the mill main motor.

These data show the wide range of application for MPS coal grinding mills. Petcokes with low volatile contents need a significantly higher product fineness compared to hard coal and lignites to achieve the optimum burnout performance. Additional figures for different mills are given in Tab

6 Conclusion

Consequent development of design and process criteria is an ongoing issue for MPS mills for grinding solid fuels such as coal, anthracite, petcoke and lignite. This is essential to meet the market demands for flexible grinding and drying of a broad range of materials. The vertical roller mill is today the standard solution for any kind of coal grinding installations. With a high reliability, low installation costs and a wide range of sizes, the MPS series provides a proven and economic solution in this regard.

AUMUND supplies full clinker conveying equipment to cement plants in Algeria

Thu, 11 Mar 2021 09:54:37 GMT

The successful partnership between AUMUND France and AUMUND China has resulted in large orders for AUMUND in Algeria for two new cement plants at Zahana and Bechar. Decades of customer support, in particular strong after-sales service by AUMUND France in Algeria, as well as the close relationship of AUMUND China to the Sinoma Group, have culminated in this achievement.

The two orders together comprise 26 Belt and Chain Bucket Elevators, two Bucket Apron Conveyors, ten Pan Conveyors and ten Drag Chain Conveyors.The Société des Ciments de Zahana (SCIZ) plant, which has a capacity of 4,500 tpd, is near Oran, around 450 km from the capital Algiers. Here three Chain Bucket Elevators with centre distances ranging from 22.5 to 34.9 m, and capacities from 50 to 220 tph, will be used to convey cement and clinker. Eleven Belt Bucket Elevators (cc 22.5 -116.1 m) will convey raw meal, cement and clinker with capacities between 190 and 680 tph.

The AUMUND Bucket Apron Conveyor with a centre distance of 61.1 m and a capacity of 360 tph will join the five AUMUND Pan Conveyors (cc 18.3 -106.8 m, capacity 300 - 360 tph) in conveying clinker. The ten AUMUND Drag Chain Conveyors with centre distances between 6.1 and 33.8 m will be used in clinker dust extraction and are designed for conveying capacities from 15 to 80 tph.

The second order for Algeria, for the Bechar cement plant, was placed by CBMI to AUMUND Beijing with support from AUMUND France. This plant has a capacity of 3,200 tpd and will operate 15 AUMUND Belt and Chain Bucket Elevators, five AUMUND Pan Conveyors and an AUMUND Bucket Apron Conveyor for its bulk materials handling. The Bucket Elevators with their centre distances ranging from 11 to 102.9 m will convey raw meal, cement and clinker with capacities from 70 to 480 tph. The five Pan Conveyors, with centre distances from 22.2 to 89.8 m, will convey their loads at up to 480 tph.The AUMUND Bucket Apron Conveyor in Bechar (center distance 88.5 m, capacity 200 tph) will also convey clinker.

AUMUND France commissions complete solution for LafargeHolcim

Mon, 16 Sep 2019 15:02:07 GMT

Some of the leading cement producers in West Africa are companies which belong to the globally operating LafargeHolcim Group. AUMUND S.A.R.L. in Paris, France, is the responsible AUMUND Group entity for this region. AUMUND France has supplied a complete solution package to LafargeHolcim Côte d’Ivoire for clinker discharge from a new silo with a capacity of 75,000t, and commissioned the equipment in the summer of 2020 despite restrictions caused by the coronavirus pandemic.

LafargeHolcim Côte d’Ivoire had placed a large order with AUMUND S.A.R.L. for its plant in Abidjan, the largest metropolitan area of the country. The supply consisted of the silo, two AUMUND Pan Conveyors type KZB with ten Gravity Discharge Gates, four AUMUND Belt Conveyors type GF, a dedusting system comprising five filters, as well as the complete electrics and automation package for the new Discharge System, which supplies clinker to three cement mills automatically. AUMUND France also received the order for the supervision of installation and commissioning, which was completed at the end of June this year.

AUMUND Equipment for clinker discharge from the silo (photos AUMUND)