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1,000,000TPY Coal Grinding Line

Material: Coal Capacity: 1,000,000TPY Input Size: <50mm Output Size: 200mesh D80
Equipment: 4 sets of MTW215 Euro-type Mill (the second phase), the auxiliary feeding, pulverizing, dust removal, powder collecting, transportation, storage and nitrogen protection devices.

Project Overview

Design Scheme --- Installation and commissioning

The energy company is a research and development base focusing on the efficient and clean use of coal in Shandong Province. The technology of micro coal atomization, its result of independent research and development, can boost the transformation and upgrading of coal industry effectively. The so-called micro coal refers to the coal powder meeting the standard of fineness after coal is ground by mills. Through the technology of micro coal atomization, the fuel can mix with air fully to form a rotary vortex and then the fuel enters the industrial boilers and burns in suspension inside. The use of thermal system, monitoring and controlling system and exhaust purifying system achieves the efficient combustion with emissions reaching the emission standards of gas. Except for the increase of input-output ratio, the clean coal production which used our 4 MTW215 European Mill (Secondary Phase) and other auxiliary machines reduced the emission of dust, SO2 and nitrogen oxides greatly.

Project Background

According to the report released by China National Coal Association, over 70% coal companies are suffering financial losses. The severe situation of coal industry makes transformation and upgrading urgent. So, under the premise of controlling coal consumption, how to increase economic profits of tradition coal firms, how to use coal resource efficiently and cleanly and how to reduce environment pollution incurred by coal combustion have been the common problems among coal companies.

(1)Depression of Coal Enterprises

According to the report released by China National Coal Association, over 70% coal companies are suffering financial losses. The operation faces difficulties and the situation of this industry is severe. Meanwhile, China actively advocates and supports the market-oriented reform and structural management in coal industry by releasing related policies. Under the condition of balancing supply and demand, it is urgent for coal industry to upgrade.

(2) Support of National Policies

The Action Plan of Clean Use of Coal (2015-2020) released by China National Energy Bureau clearly stipulates that by 2020 the use ratio of efficient boilers must reach 50% at least in some areas. According to the fifth plenary of CPC’s 18th Central Committee, the clean use of fossil energy must be put on the schedule, coal included. So it can be concluded that the promotion of efficient and environmental coal powder boiler will be a key energy-saving technology in China.

(3) Support from Local Government

To stimulate transformation and upgrading, Shandong government subsidized some major PPP projects. Meanwhile, Shandong province launched an action plan (2015-2018) to promote efficient and environmental coal powder boilers. The plan showed that the efficient coal powder boilers can be used for heat supply and steam supply and therefore the boilers should be popularized and applied as soon as possible.

(4) Environmental Pressure

Using coal briquette as the fuel, traditional industrial boilers discharge a great deal of dust and contaminant. However the use of coal powder makes local area free from pollution with all emissions below the national standards. The emission of dust is ≤30mg/m3, SO2 ≤100mg/m3, nitrogen oxides ≤200mg/m3.

(5) Economic and Environmental Profits Brought by Combustion of Coal Powder

The use of coal powder boilers can burn over 98% of coal powder. Meanwhile, compared to the traditional boilers, the coal powder boilers can save energy by over 30% while heat efficiency keeps above 90%. The operation costs can be reduced by 20-30%. What’s more, the unit cost of fuel of coal powder boilers occupies one third of that of gas boilers only.

Design Scheme

Project Site: Shandong, China

Equipment: 4 MTW215 European Mills (Secondary Phase) and other auxiliary machines used for feeding, powder preparation, dust removal, powder collection, transportation, storage and nitrogen protection

Material: Coal

Finished Product: Coal powder

Input Size: <50mm

Output Size: 200meshes, D80

Capacity: 1,000,000TPY

Configuration of Production Line

Main Equipment of Coal Preparation System

4 MTW European Mills (Secondary Phase)

The complete system of MTW Series European Mills is advanced. The mill is equipped with the bevel gear integral transmission device, inner thin-oil lubrication system, monitor of oil temperature. Meanwhile, the mill boasts small occupation of land, low total investments, low operation costs, high efficiency and environment protection./p>

Compositions of Coal Preparation System: Raw material bin, weighing coal feeder, MTW European Mill, powder collector (anti-explosive dust collector), fan, de-iron separator, drying system, conveying system, etc.

Process Analysis

Raw coal is sent by quantified feeder to the scrapper conveyor which then sends coal to the dryer for moisture removal. Then the coal enters the closed storage bin through closed scrapper conveyor. The coal is then transferred to the raw material bin of powder preparation system and by weighing coal feeder the coal is fed into MTW215 European Mill. After that, the coal powder undergoes the classification and following this step the coal powder enters into the powder collector along the tube (The remaining air is collected by impulse dust collector). The finished coal powder collected enters the elevator under the action of spiral conveyor. Finally, the coal powder is elevated to the coal powder storage bin. And if there is any need, the finished coal powder will be transported by the tanker. The complete set of this system is equipped with the nitrogen making system and CO2 system to avoid explosion and to extinguish the fire if necessary. Meanwhile, anti-explosive valves are installed at the key parts in avoidance of possible damage to the equipment.

Project Advantages

(1) Turnkey Project

To save construction time and investment costs, the coal powder preparation system took the EPC service. EPC service belongs to a turnkey service specially designed and offered to bring convenience to our customers. The service covers every and each stage of a project including the topographic survey, design of production line, test of raw material, the analysis of requirements on finished product, calculation of investment costs, installation of machines, and commissioning, etc. It helps customers avoid some unnecessary problems like the insufficiency of building materials and labors. EPC service makes the operation more convenient and it is available for those customers who need put production into operation in a short time. BTW, this customer from Shandong spoke highly of our EPC service after he chose the service.

(2) Easy Operation

To make the operation of the coal powder preparation production line easier, we took unique two-step method. Specifically, the two-step method refers to the solution which separates the drying process and powder preparation process. The relatively cooler grinding cavity is the special technology owned by MTW European Mill. The system is simple and easy to be controlled, which guarantees the safe operation to some extent.

Compositions of System: Storage bin of raw coal, Dryer, Weighing coal feeder, MTW European Mill, Impulse dust remover, Powder collector, Fan, Storage bin of finished coal 9. Storage bin of coal powder 10. Monitoring system 11. Centralized control system

(3) Low Investments

The MTW Series European Mill is equipped with the bevel gear integral transmission device, inner thin-oil lubrication system, monitor of oil temperature. Meanwhile, the mill boasts small occupation of land, low total investments, low operation costs, high efficiency and environment protection.

(4) Safe and Environmental

To ensure safe operation during the coal powder preparation, the production line is equipped with nitrogen making system and CO2 fire extinguishing system in avoidance of explosion and fire accidents.

Meanwhile, some effective measures are taken to control the emissions. The content of dust meets the stipulated standards. The use of advanced impulse dust collector reduces the negative impact on surroundings.

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