lm vertical roller mill, vertical mill manufacturer
LM Vertical Grinding Mill integrates five functions of crushing, grinding, powder selection, drying and material conveying. It is characterized by centralized technological process, small occupational area, low investment, high efficiency, energy conservation and environment protection. LM Series Vertical Roller Mill is used to pulverize materials, material can be pulverized into 80-400Mesh with this mill.
Feed particle size: 0-70mm
Production capacity: 4-300 tons / hour
Applicable materials: limestone, coal, feldspar, calcite, fluorite, talc, iron ore, copper ore, phosphate rock, graphite, quartz, slag, etc.
Full set of LM grinding equipment includes main unit, bucket elevator, raw material warehouse, belt conveyor, iron separator, intermediate bunker, closed type quantitative feeder, special pulse filter, fan, air valve, hot blast stove.
LM130M high-efficiency pulverized coal production line has high efficiency and environmental protection, processes coal into high-efficiency pulverized coal for steel mills, which benefits customers greatly.
In 2016, we established an efficient and clean production line for a state-owned energy company in Gansu Province, with an annual capacity of 300,000 tons, which has become the focus of high-efficiency pulverized coal industrial boilers in the city and surrounding areas.
Power generation industry studies have shown that coal pulverizers are an area where improved equipment reliability is badly needed. The Electric Research Institute (EPRI) has determined that 1% of plant availability is lost on average due to pulverizerrelated problems.1 EPRI also identified oil contamination and excessive leakage as two areas where pulverizer drive train failures account for 53% of pulverizer problems.
Pulverization is currently the favored method of preparing coal for burning. Mechanically pulverizing coal into a fine powder enables it to be burned like a gas, thus allowing more efficient combustion. Transported by an air or an air/gas mixture, pulverized coal can be introduced directly into the boiler for combustion.
This type of mill consists of a rotating tube filled with cast alloy balls. Coal is introduced through two hollow trunnions on each side of the tube. As the tube rotates, the balls tumble onto the coal, crushing and pulverizing it.
Grinding Action is carried out by a series of hinged or fixed hammers revolving in an enclosed chamber with wear resistant plates. The hammers impact on the coal, crushing it against the plates. Further pulverization is achieved as the smaller coal particles are ground through attrition against each other and the grinding face.
This mill uses hydraulically loaded vertical rollers resembling large tires to pulverize raw coal fed down onto a rotating table. As the table rotates, the raw coal is pulverized as it passes underneath the rollers. Hot air forced through the bottom of the pulverizing chamber removes unwanted moisture and transports the pulverized coal dust up through the top of the pulverizer and out the exhaust pipes directly to the burner. The more recent coal pulverizer designs are Vertical Roller Mills. Figure 2 shows a cutaway view of a Babcock and Wilcox MPS Pulverizer.
Mills A ball or roller between two races or rings provides the grinding surfaces on which pulverization occurs. One or both of the races may rotate against a ball or roll (in a Ring-Roll Mill the rolls may rotate while the ring is stationary). Ring-Roll (Bowl-Mill) and Ball-Race Mills comprise the majority of coal pulverizers currently in service at power generating facilities.
In this design the grinding rolls are stationary, while the ring (or bowl, as it is sometimes called) is rotated by a worm gear drive. Powerful springs force the grinding rolls against the ring, providing the pressure required to pulverize the coal.
Raw coal enters the top of the pulverizer through the raw coal feed pipe. The raw coal is then pulverized between the roll and rotating ring. Hot air is forced in through the bottom of the pulverizing chamber to remove unwanted moisture and transport the coal dust up through the top of the pulverizer and out the exhaust pipe directly to the burner. Coal that has not been pulverized into fine enough particles cannot be blown out of the top of the unit; it falls back to the ring and roll to be further pulverized.
The gears and bearings in the gearbox are oil lubricated. Fine coal particles and wear metals from grinding surfaces enter the lube oil through worn bearing and shaft seals, as well as being inhaled through reservoir vents. Historically, the design of pulverizers has been based on the expectation of few drive system problems under prescribed operation and maintenance. In practice, this has often been found not to be true.
Many coal pulverizer designs do not incorporate any filtration in their lube circuits. The pulverizers that do not incorporate filtration use coarse filtration such as 40-micron cleanable mesh or 200-micron cleanable, stacked disk filters. Such OEM-supplied filtration is often unable to keep up with the inherently high ingression rate. This results in contamination levels often exceeding ISO code 30/30, particularly on older designs. This high level of contamination can severely diminish bearing, gear, pump, and seal life, leading to premature need for replacement or rework. Coal pulverizer downtime can be a major factor in reducing overall plant availability and reliability.
Upgrade to Achieve Total Cleanliness Control (See diagrams on back page) The majority of pulverized coal particles are in the 4-30m range, with 70% of these particles smaller than 10m. Ingression rates vary with manufacturer, model, and age ofunit, with older units usually admitting contaminants faster than newer ones. Particulate contamination in the lube system can result in rapid damage to critical components.
In order to protect the coal pulverizer lube system components, Pall recommends maintaining a fluid cleanliness level of ISO 16/13 or better. This can be accomplished through the use of Ultipleat SRT AS grade (12(c) 1000) or finer filters. Ultipleat SRT filters, with their high particle removal efficiency and dirt-holding capacity, are ideally suited to cost-effectively control contamination in this high-ingression application.
When upgrading in-line filtration, a Pall Duplex Assembly is recommended so that elements can be changed out while the pulverizer is operating. Although putting filtration in-line is preferred, difficulty in getting system specifications from the OEM, combined with the typically low pump pressure associated with this application, may make kidney loop filtration a more viable alternative. Reservoir volumes typically vary from 15-300 gallons.
A 20% reservoir volume per minute flow through a kidney loop is generally sufficient to overcome the ingression rate of most applications. The high-viscosityof gear lube oil (2,200 SUS at operating temperature) along with the inherently rapid ingression rate usually associated with these units makes it necessary in most cases to utilize at least one UR619 housing with a UE619 element (12(c) 1000 or finer) for every 50 gpm of flow to provide superior filtration with long element life. Since the pulverizers come on- and off-line, it is important to size the system for the oil viscosity at the coldest possible ambient plant temperatures. Line diameters in the kidney loop should be large enough to facilitate flow of highly viscous lube oil.
Other applications where Pall high-performance filtration is useful include coal-carrying cars and conveyor belts. Many of these applications have both hydraulic and lube systems that are vulnerable to coal dust contamination. This equipment is required to transport the coal stored on-site to the coal pulverizers. Because this equipment is essential to theoperation of the power plant, it is critical that this equipment be free from contamination-related failure.
In March 2003, a major Canadian utility derated its Unit 4 due to a failure of the B mill. The mill was expected to be out of service for about a month. With lost production of approximately 864 MWh per day, the total estimated revenue loss was around $2,000,000. Repair costs for this outage added up to more than $400,000 due to the severity of the damage to drive train components. An analysis concluded that there were multiple causes of this problem, including poor predictive/preventive maintenance practices and poor oil cleanliness.
Pall provided a filter housing for a sixmonth trial to show that oil cleanliness could be improved to industry standards and maintained without the incurrence of substantial element costs. Oil cleanliness went from 20/19/17 to 18/16/13 in approximately 2 hours and has been maintained at this level since.
long-lasting coal mill for efficient grinding | flsmidth
Our ATOX Coal Mill is a compact vertical roller mill that can grind almost any type of raw coal. The coal mill utilises compression and shear force generated between the large rollers and the rotating table to crush and grind raw coal, removing the need for a separate piece of equipment for crushing. The coal mill can also grind petroleum coke and anthracite down to a fineness below 5% +90 micromillimeters (mm) when coupled with a variable speed mill motor.
As the feed material is added to the mill, the moisture evaporates almost immediately. A continuous gas stream from the nozzle carries the finer particles to the separator, where they will be assessed for the specified fineness. For safety reasons, the coal mill is designed with no external recirculation of materials. Material is prevented from spilling over the edge of the dam ring as both the dam ring height and grinding pressure are adjustable.
The ATOX Coal Mills efficient separator allows material that has reached the required fineness to leave the grinding mill and sends oversized material back for further grinding. The fineness is controlled by adjusting the rotor speed. The high efficiency of the separator is due to the rotor being equipped with an outer ring of louvre plates that are hardfaced for longevity.
The durable grinding mill can handle virtually any type of raw coal and has been designed to grind feed materials with varying moisture levels. The ATOX Coal Mill handles feed materials with less than one percent moisture and up to 25 percent moisture, where abrasiveness and stickiness is not an issue for grinding.
The materials used to produce the ATOX Coal Mills segmented wear surfaces are durable and therefore, last longer. The reversal of liner segment option maximises use of these hard surfaces, making sure every surface is exploited while helping to address uneven wear at the same time.
The separator, with the highest mill capacity, ensures high separation efficiency through having a low bypass to reject. An efficient separator leads to a number of benefits including low specific power consumption for the mill motor, low vibrations, energy savings due to minimal pressure loss, and optimised airflow.
Long-lasting durability is extended to the separator where the inside of the reject cone and outlet top section are faced with Densit. The wear plates for the louvres are also hardfaced to maximise wear life.
The ATOX Coal Mills equipment is located at or above floor level for easy maintenance and cleaning. There are easy-access doors for inspection and maintenance of all of its parts, where roller replacement can occur while still inside the mill. For comprehensive maintenance, the large door is removable for crane access.
Our coal mill offers the flexibility of non-inert and inert operation, depending on the exploding potential of your coal type. The tailored layout considers your coal grinding needs, ensuring simple and optimised operation. For example, the availability of heat sources to dry raw coal helps determine the final layout.
Liner segments can be reversed so that the wear, which normally occurs on the outer edge, can be spread evenly, making use of the entire segment surface. The coal mills liner segments can also be repeatedly hardfaced for maximal longevity.
The heated rotary feed sluice ensures uniform flow of feed into the ATOX Coal Mill for optimum mill operation including minimising power consumption. It is the right solution for a sticky feed material as hot gas from the mill inlet is guided through the rotor, preventing the sticky
FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.
coal mill,reliable coal mill supplier
Coal mill, which is also known as coal grinding mill or coal milling machine, is used to pulverize and dry coal before it is blown into the power plant furnace in the coal-fired power plants. Coal mill is an important auxiliary equipment for coal-powder furnace, it has three methods to crush the coal lump and grind them into powder,it is crushing, impacting and grinding.
Coal mill is used to grind, pulverize and dry coal before the coal is transmitted the boiler. The coal is feed into the coal mill via a inlet pipe so that the roller coal mill such as ball mill or vertical mill can pulverize the coal into particles.
Air swept coal mill is the main equipment in cement plant for both drying and grinding of the powders. Compared with the ordinary ball mill, it has advantages of higher capacity, more convenient operation, safer usage, and more reliable performance.
The raw coal enters the mill via an airtight feed screw and is discharged onto the centre of the rotating grinding table. The rotation of the table accelerates the flow of material towards the grinding track where the coal is ground between the table and the three rollers. The coal then continues over the dam ring and is entrained in the hot drying air that enters the mill house through the nozzle ring.
The air lifts the coarser particles back onto the grinding table and sweeps the finer particles up to the separator that lets the final product proceed to the mill outlet while returning the coarse fraction to the table for further grinding.Having left the mill at the top, the final product continues with the air to a cyclone or a bag filter where it is collected.
coal vertical roller mill
ChaengVertical Coal Mill has simple process, compact structure,and ithas less dust, low noise, high efficiency granular composition, and excellent combustion performance due to its special design and structure.
It is widely used in Cement Plant, Steel Mill, Thermal Power Plant ,electricity field, metallurgy sector, building material industry, chemical industry, etc. It is an ideal device that integrates crushing, drying, grinding, and grading conveying all together.
According to the display of material production measured data, it can be saving electricity above 30% use of vertical roller mill production per ton raw material than traditional ball mill, and power saving effect is very remarkable.
The material through the feed tube fell into the center of grinding plate, and then the materials outwards the surrounding area of grinding plate at centrifugal force, to forms a certain thick layer of materials bed, at the same time material was crushed by number of rollers. The materials continuous moving to the outer edge of the grinding plate, off the grinding plate materials rising with the hot air which enter from wind ring into the vertical roller mill, through the vertical roller mill shell into the middle of the separator, in this course materials and hot gas got a fully heat exchange, the water quickly evaporates. Separator controls the finished product output size, greater than the specified size are separated and fall back to the plate, while meet the fineness demands are brought through the separator into the finished product warehouse.
Project name: Great Wall machinery slag powder demonstration and training base with annual production of 600,000t
Project address: Great Wall Road, Mengzhuang Town, Huixian City, Henan Province
Contracting mode: General contracting---...
Project company: Xinxiang Huaxin Power Group Co., LTD
Project address: NO. 184, Baoshan Road, Fengquan District, Xinxiang City
Main engine: 3.213 m three-cabin clinker ball mill
Production capacity: unknown...
industrial coal pulverizes - used pulverizing mills | wabash power
Wabash maintains the largest inventory of used & reconditioned Raymond mills in the United States. The Raymond brand is considered the gold standard for pulverizing coal and minerals. Wabash has been an industry leader for over 40 years supplying refurbished mills and components for a variety of industries including cement, lime, mineral aggregates, and power generation worldwide. Our inventory of mills and related components can be inspected in our 85,000 square foot facility located in Saginaw, Michigan. Our equipment is finished and ready to ship whether you are expanding capacity or in an unexpected emergency situation.
roller briquette press machine technology and specification
For BIOMASS BRIQUETTE, we recommend to use other briquette machines, like the log briquette maker, screw bio briquettes machine, wood chip compactor and biomass brick briquetter. Find them in our briquette machine center.
In the roller briquette press process, the materials need to add binder before briquetting, we have different consideration for the binders, for example, if your material is too wet to briquette, we usually need to dry it, but if the moisture is not that high, we solve the problem by adding some dry binder not only for briquetting also for moisture controlling. The proportion of binder is different for different materials.
Two kinds of roller materials are usually used, 65Mn and 9Cr2Mo. The 65Mn roller is a kind of steel castings material with low cost and the 9Cr2Mo roller ishigh chromium alloy material which cost more but with higher wear resistance.
All of the two rollers are treated with our special heat treatment to make it withhigh wear resistance. For different briquette materials, you should choose roller by your condition. Generally, the 65Mn roller is used in small briquette machine with soft material, such as coal, charcoal, carbon, etc. And the 9Cr2Mo roller is usually used in the big briquette machine with materials such as mineral, iron powder,laterite, etc.
Crusher: If your material is too big, generally, a crusher must be needed, or else that will reduce the working life of the roller. Furthermore get proper size material is also a wayto makewell binder mixed material;
hlm vertical roller mill
The motor drives the reducer to rotate the millstone, the raw material are send into the center of the millstone from the air lock rotary feeder. Under the effect of centrifugal force, the material moves to the edge of the millstone. Material than be ground by the force of the roller and smashed under extrusion, grinding and cutting. At the same time, hot air is blew up around the millstone and bring up the ground material. The hot air will dry the floating material and blow the coarse material back to the millstone. The fine powder will be brought to the classifier, and then, the qualified fine powder will flow out the mill and be collected by dust collector, other coarse powder will be brought down to the millstone by the blade of classifier and be ground again. The circulation like this is the overall process of grinding.
With scientific & reasonable design and its unique advantages, HLM vertical roller mills are applied widely in power, metallurgical, cement, chemical and non-metallic industry, for grinding of various materials, such as cement raw material, clinker, limestone, slag, manganese, gypsum, coal, barite, calcite etc.. The grinding field is wide and grinding type is abundant.
1. Humidity of grinding materials: from materials of 20-30% humidity(such as carbide, lignite, chalk, etc.) to materials of humidity less than 1% (such as cement clinker), wide range of materials. 2. Grindability of materials: from high grindability(such as quartz sand, steel slag, mining slag, pyrophyllite, iron ore etc.) to low grindability (such as gypsum, calcite, etc). 3. Fineness of grinding product: from 2-5mm(such as raw shale for making brich in new wall material industry, sand for construction industry, etc) Product fineness is easy to adjust and simple operation.
HLM vertical Mill uses standard modules to design and fabricate pressurization device. With the increase in mill capacity, there is an increase in roller numbers (we can use 2,3 or 4 rollers, 6 rollers maximum) in proper permutation and combination to form the series of equipment of various capacitieswith minimum standard parts in order to meet the requirements of different materials, finenessand outputs.
A cyclone filter is used for collection of product. This arrangement can help to reduce negative working pressure and air volnme of system. Both EP and bag filter can be used as final prodnct collector.
The equipment features in a combination of crushing, drying, grinding, and conveying, simple process flow, reasonable and compact layout, space-saving (50% less than ball mill), lower foundation cost and workshop cost in the field;
(3)Vertical mill is the better equipment to lower power consumption in the mill industry, which is also what the country advocate and a must to increase the enterprise competitiveness in China powder industry.
(1) Vertical mill features in high trying ability with hot air direct contact with the material in the mill, maximalfeeding moisture of 15% is workable. A separatedrying machine and energy for the mill system can be both saved. The vertical mill can satisfy the materials in different humidity by adjusting the hot air temperature.
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