According to a report of the China Coal Industry Association, the industry situation is really severe, with nearly 70% coal enterprises suffering a loss, and the transformation of the coal industry is extremely urgent. Therefore, on the precondition of controlling the total coal consumption volume, how to improve the economic benefits of traditional coal enterprises, how to utilize the coal resource efficiently and cleanly, and how to reduce the coal pollution to the environment have become the studying issues of numerous enterprises.
Customer address: Shandong
Material: Coal
Output Size: 200mesh D80
Capacity: 1,000,000TPY (Phase-II)
Equipment: Four MTW215 European Grinders (phase-II) and supporting feeding, pulverized coal production, dust extraction, pulverized coal collection, conveyance, storage, and nitrogen protection devices.
4 MTW European Mills (Phase-II)
The MTW series European Mill is a new generation of grinding machines. This machine adopts multiple advanced technologies, including integral bevel gear drive, internal thin oil lubrication system, and online measurement of oil temperature, and boasts multiple proprietary patented technological property rights, characterized by small occupational area, low investment cost, low operating cost, high efficiency, and environmental protection.
System composition:
RaRaw material bin, enclosed constant weight feeder (optional), MTW European Grinder, pulverized coal collector (explosive-proof precipitator for coal grinder), fan, de-ironing separator, drying system, and conveyance system.
The air is compressed by the compressor and, after a majority of oil, water, and dust is removed by the high-efficiency de-oiler, a mass of water content is removed by the refrigeration type compressed air drier, and the dust is removed by the dust fine filter. Then the air is buffered by the air reservoir and enters into the pressure swing adsorption oxygen-nitrogen separation system (namely nitrogen preparation unit) filled with absorbent. The clean compressed air is fed from the bottom of absorption tower and, after being diffused by the air diffuser, the air is input evenly into the absorption tower. After the oxygen-nitrogen absorption separation, the nitrogen is output from the outlet and enters into the nitrogen stabilizing tank.
When the temperature within the protection zone exceeds the pre-set alarm temperature value, the alarm signal is transmitted to the alarm unit which sends a command to the alarm bell to start alarming. The CO concentration alarm signal is also connected to the fire alarm unit via signal wire. When the CO concentration exceeds the pre-set value, the alarm unit sends a command to the sound-light alarm to start alarming. Then, the alarm unit starts the 30s' countdown. When the countdown is completed, the alarm unit sends a signal to the CO2 fire extinguishing system so that the nitrogen starting cylinder battery opens the corresponding solenoid valve and the nitrogen starts the CO2 fire extinguishing system to extinguish the fire for the alarm zone. The system has four control modes, automatic, manual, mechanically emergency manual, and emergency start/stop mode respectively.
The pneumatic conveyance system mainly functions as conveying the pulverized coal into the finished product tank and long-distance conveyance is available.
With the industrial computer as the core unit of the entire system, the central control system reads the PLC or ECS by multiple communication technologies to collect the conditions of the site equipment and, based on the conditions of site equipment, computer sends commands to control the site equipment to realize the functions, including remote control of equipment, record analysis of equipment information, and printed operation report.
The MTW European Mill has the intelligent control system developed and designed especially as the pulverized coal mill and adopts the ESC intelligent control system to realize the centralized control and the remote monitoring function---observing the running conditions of production line via mobile terminal equipment such as mobile phone and iPad, can also be realized.
The raw coal in the bin is fed by belt feeder into the scraper conveyor constantly and evenly by which the raw coal is then sent into the dryer for baking. After baking, the raw coal is conveyed by the enclosed scraper conveyor to the enclosed storage bin. Transferred by truck to the raw material bin of pulverization system, the raw coal then is fed by belt conveyor into the MTW215 European Mill. The pulverized coal, graded by the pulverized coal separator, is supplied along the pipeline into the pulverized coal collector (The residual gas is collected by pulse dust collector). The finished pulverized coal collected is fed by screw conveyance system into the pulverized coal elevator to finished product bin for storage. The pulverized coal is transported by the tanker truck depending on the actual needs. The entire system is equipped with nitrogen generator system and CO2 system for explosion-proof and fire-extinguishing protections and its critical parts are installed with explosion-proof valve to guard equipment against damage.
To minimize the project construction period and reduce the customer's investment, this pulverized coal preparation project adopts the EPC service. It is a turnkey service designed by SBM to bring convenience to our customers. This service runs through all projects steps, including site terrain & environment survey and investigation, production line process design, raw material inspection and testing, finished product analysis, investment budget analysis, and equipment installation and commissioning, which can prevent downtime and delay of production caused by inadequate preparation of construction materials and labor shortage. The EPC service realized the maximum production convenience for the customer, met the customer's need of urgent production schedule, and won the high appraisal from the Shandong customer.
Operation ConvenienceTo promote the operation convenience of pulverized coal production line, this production line adopts the unique two-step (baking and pulverizing) operation method. The two-step pulverized coal preparation system is a solution with baking and pulverizing separated. With relatively low temperature inner the grinding chamber, it's the unique pulverized coal production process of MTW European Mill. This process system features simple and easy control and can remarkably improve the safety performance of the production line.
1. Raw coal bin 2. Dryer 3. Weighing coal feeder 4. MTW European Grinder 5. Pulse dust collector 6. Pulverized coal collector 7. Fan 8. Finished coal bin 9. Pulverized coal bin 10. Monitoring system 11. Explosion-proof system 12. Central control system Low InvestmentThe MTW series European Mill adopts multiple advanced technologies, including integral bevel gear drive, internal thin oil lubrication system, and online measurement of oil temperature, and boasts multiple proprietary patented technological property rights, characterized by small occupational area, low comprehensive investment, low operating cost, high efficiency, and environmental protection.
Safe and Environment-FriendlyTo be fire-proof and explosion-proof during the pulverized coal production, the production line is equipped with nitrogen system, CO, and CO2 fire extinguishing system to guarantee running safety and stability of equipment to the maximum extent.
Meanwhile, the effective measures are taken to strictly control the dust concentration of exhaust gas within the national specified range. The production line adopts the pulse dust collector manufactured with advanced technologies to reduce the influence on the surrounding environment to the maximum extent.
EPC Service
two-step (baking and pulverizing) method
Pulse dust collector
Due to large scale of this pulverized coal production line and strict quality requirement on pulverized coal, through extremely careful selection of manufacturers and the long-time multi-aspects investigation, we finally selected the equipment manufactured by SBM. From the site investigation to the installation and commissioning, we received professional solutions and services and four coal pulverization mills (Phase-II) are running well, with the production capacity exceeding the design capacity.
The core of this technology is the "pulverized coal configuration and multiple vortex atomization", namely the high-speed air vortex is mixed with grained coal of 200 mesh into the vortex atomizer so that the pulverized coal and the air are sufficiently mixed and atomized to form a vortex and are fed into the boiler for floating combustion to realize high-efficiency combustion via thermodynamic system, measurement and control system, and exhaust gas purification system, with the emission meeting the emission standard of natural gas.
The pulverized coal used in the high-efficiency pulverized coal boiler system is selected, dried, and ground to be pulverized coal of 200 mesh for centralized management and distribution, which can effectively guarantee the quality stability of pulverized coal and eliminate the scattered coal piles and reduce the surrounding pollution, featuring high efficiency and energy conservation, clean emission, high automation level, environmental-friendliness, and outstanding economic, environmental, and energy conservancy benefits. The vigorous development, promotion and application of high-efficiency and environmental-friendly pulverized coal boilers is of important significance to boost the clean and efficient coal utilization, improve the atmospheric environment, and develop the energy conservation and environment protection industry.
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Economic Benefit
A coal-fired boiler reformed by pulverized coal atomization technology can promote the combustion efficiency to 98%, the thermal efficiency to >90%, and steam output per ton from 5.5T to >9T. Compared with a traditional coal-fired boiler, it can save coal by >30%, electricity by 20%, water by 10%, land by 60%, and manpower by 50%. The pulverized coal produced realized RMB 800 million of sales volume and RMB 100 million of profit and tax.
Social Benefit
After atomization, the pulverized coal produced by this production line is supplied to the industrial boiler for combustion, which breaks the traditional combustion method by block coal. The efficient and clean use of coal boosts the transformation and upgrading of coal industry. It's of enlightening significance for the coal enterprise to successfully live through this severe situation.
Environmental Benefit
Emission of all atmospheric pollutants is equal to the emission standard of the natural gas boiler---no dust, coal slag, and smoke.