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1、The feasibility study report of coal moisture control projectCoal moisture control technology development in the past 30 years, has now developed into hot flue gas as the heating medium, dehydrated in a fluidized bed for equipment form third generation moisture control technology. The companys coal
2、moisture control technology both in the investment cost, or in the integrated processing performance, operation and maintenance have more advantages. Through the implementation of the project, and the technical achievements to the coking industry application, not only can make the enterprise with a
3、smaller investment to achieve energy saving effect is good and obtained better economic benefit, promote technological progress, but also strong support for scientific research units of technical achievements, form a benign circulation, thus with the development policy of national industry structure
4、 adjustment policy and related technology, achieve win-win situation.Coal moisture control (Coal Moisture Control CMC) is moisture of charging coal control process for short, is a part of coking coal for removal of water in the oven before installing, keep the moisture of charging coal stable at aro
5、und 8.5% (tamping coke oven) or 8.5% (top), then the furnace coking.CMC is different from the coal preheating and drying. Coal is preheated to the coal in the furnace to decompose before starting temperature with gas heat carrier or solid heat carrier heating (150-250 ), when the moisture content of
6、 coal is zero, then install the furnace coking; coal drying without water control measures strictly; after drying the moisture change with coal branch moisture changes. Coal moisture control strict water control measures, to ensure that the water content of coal into furnace constant.To reduce and s
7、tability control of coal moisture through direct or indirect heating, do not pursue to maximize the removal of furnace coal moisture, and the water stability at a relatively low level,Not only can increase benefit, and not because of the low moisture content caused by coke oven and recovery system o
8、peration, make the coal density increases, coke and chemical products production, reduce the amount of coke oven heating gas, coke quality improvement and coke oven operation and stable effect.In the past 10 years of coal moisture control technology has got great development, has developed the three
9、 generation of coal moisture control technology. The first generation is the thermal medium oil drying method. Sensible heat, using thermal oil recovery coke oven flue gas waste heat and coke oven ascending pipe and then, in a multi-tube rotary dryer, heat conducting oil of coal indirect heating, so
10、 that the coal drying.The second generation is steam drying method. The use of other low pressure steam CDQ steam generation after the back-pressure steam or within the plant as a source of heat, in multiple rotary dryer, the steam of coking coal indirect heating drying.The third generation of fluid
11、ized bed device is the latest generation, using dry flue gas of coke oven heating on it. The technology of coal moisture control can reduce furnace coal moisture, the moisture control in a suitable target value, reduce the heat consumption in coking coal into the furnace, increase bulk density, to i
12、mprove the quality of coke. The technology is the Tangshan Tak Technology Co., independent research and development, with independent intellectual property rights, and has made many patent technology. Successful application is now in a company, and achieved good economic benefit.Coal moisture contro
13、l technology application effectBecause of lower moisture of charging coal, so coal bulk density increased, carbonization time is shortened, the production capacity of coke can be improved 7%-11%;Coal moisture decrease 1%, (dry heat consumption in coking coal) to reduce 62MJ/t. When the moisture cont
14、ent of coal fell from 11% to 8.5% (dry, heat consumption in coking coal) is equivalent to saving 155MJ/t.Improve the quality of coke. The M15150 can improve 1%-1.5%, coke strength after reaction of 1%-3% can be improved; the coke quality guaranteed under the condition of invariable, but more weakly
15、caking coal 8%-10%, cost of 20-40 yuan / ton coke decreased.To reduce the moisture of coal material can reduce the residual ammonia water 20-30%, a corresponding reduction in 20-30% ammonia steam consumption, but also reduce the amount of wastewater treatment. Reduce the cost of waste water treatmen
16、t.The social effect of energy saving is to reduce the greenhouse effect, when the use of coke oven flue gas as heat source, the average per ton of coal into the furnace can be reduced about 35.8kg/t CO2.Moisture of coal material stability can be maintained for coke oven operation stability, prolong
17、the service life of coke oven.The main problems existing in Chinas coking plant: the production capacity of Chinas existing coke oven is bigger, occupy the first place of the world, but the high moisture and high quality coking coal and shortage, the main problems as below:High-quality coking coal s
18、hortage;High moisture content, high heat consumption in coking;Coking coal is composed of a variety of coal, composition and properties of the particle size of coal in the same kind of coal are not the same, some of these very different kinds of coal; properties of different coals are different. Cok
19、ing coal production requirements between different size differences as small as possible, and the current coal preparation process routine cannot meet this requirement.二 The main technical data of fluidized bed dryer:The dried material name: 50 m 6mm pulverized coal (about 80%)Feed speed: kg/hDischa
20、rge rate: .74kg/hFluidized bed water evaporation: 5312.692kg/hProduct initial moisture contents: 11%The final moisture content: 8.5%The material into the bed temperature: 20 The material out of bed temperature : 60 Hot air entrance temperature: 260 Exhaust temperature: the average temperature of 100
21、 Thermal calculations:Here omittedDesign capacity: 200 tons / hour; (design capacity of tons / year of dry coke, coal tons / year).This project construction technical scheme includes a general scheme, process flow, coal moisture control main device and blowing and induced draft fan system, safety mo
22、nitoring and control system, pipeline and coal conveying system, dust removal equipment, auxiliary production facilities etc.三 The overall project plan:1.Use of 260 (300 oven flue gas temperature, 40 reducing conveying approximate moderation) coke oven flue gas waste heat boiler emissions hot air he
23、ating coal, the water content is reduced from 11% to 8.5% is sent to the tower, furnace coking coal. Waste heat recovery, energy saving purposes.2.Process flow and layout:Will be crushed before loading quantitative, furnace coal continuously transported to the drying room humidity, and then transfer
24、red to the wet coal for coking coal production. The system is mainly composed of a coal scuttle, belt conveyor and gallery, wet, dry, fluidized bed coal bunker, dry, wet dust collector, a hot air pipeline, drum (Draft) fan, etc.Figure 1 is a process flow chart:Here omitted3. Device of coal moisture
25、control: (1)By 260 oven flue gas waste heat boiler emissions hot air heating coal (2)Flue gas composition (percentage by volume) CO2: 6.41%； H2O: 20.06%； O2: 3.68%； N2 : 69.85%； (3)Raw coal size distribution and water content:（3-1）Grain size（mm）0.50.51166%28.813.13028.1（3-2）Coal moisture content: 11
26、%（4） The specific heat values of coal: 1.26 kJ/kg. (5)Blower parameters are as belows:315kW，380v，P=4000Pa；(Frequency conversion motor) flowQ=NM3/H；Included draft fan parameters are as belows:315kW，380v，P=4000Pa；Q=NM3/H；4. dryer:Processing capacity of 200t/h fluidized bed conditioning machine, coal c
27、onveying coal system shipped to wet, wet coal by belt conveyor to charging coal conveying system for existing coal tower for coke oven coke production. In the dryer direct heat exchange after the cold and wet coal through the ventilation system will be out of the wind temperature up to 80 -100 , the
28、 cyclone dust collector, bag dust catcher dust through the chimney emissions.5. Others:（1） Coal conveying system of belt conveyor.（2） Belt conveyor dryer chamber and are respectively arranged on the belt weigher,: online moisture tester, temperature monitor system.（3） Safety monitoring and control s
29、ystem:Safety monitoring system:System of oxygen content on-line detecting instrument, which can output a high alarm signal, related equipment and the high level signal interlocking. When the oxygen content is high alarm signal, the system will automatically filled with nitrogen or steam; when a high
30、 level signal, conditioning system equipment according to the interlock shutdown. Humidity control system in micro positive pressure operation, not from the atmosphere to the equipment is charged with oxygen.（4） he exhaust fan of all flue gas pipeline, circulating air flue gas pipeline, fine-grained
31、 recovery device all adopt heating measure, the quality of small, low thermal conductivity of the thermal insulation material. Heat medium with 300 flue gas. According to the change of fine-grained recovery device of entrance flue gas temperature, by mixing to fill gas, timely adjustment, to ensure
32、stable and reliable operation of fine-grained recovery device.（5） Dryer and fine-grained recovery device are provided with a venting device, ensure the abnormal conditions, timely equipment inside the pressure drop, and the protection of the environment safety.Control system:(1) Changes in humidity
33、of coking coal moisture and grain size distribution, temperature and supply the hot flue gas volume will cause fluctuation of humidity effect, the system automatically adjusts the feeder feeding amount and humidifying device discharging speed through the establishment of static data tables in the co
34、ntrol strategy, to control the water to. At the same time, the conveyor belt is arranged on-line moisture analyzer in the products of coal, the actual detection of moisture value feedback correction data tables, achieve the goal of optimizing control, stable operation.(2) The fluidized bed coal mois
35、ture control equipment using Siemens PLC S7-300 (314) as an industrial controller, the system is stable, suitable for all kinds of production site; system by changing the values of various testing equipment for real-time detection of hot air flow rate, temperature, pressure, processing capacity, the
36、 coal, water classification variables, by changing the amount of feedback, automatic adjustment of the valve opening degree, increase or decrease the hot air flow rate and bed height blast, to achieve automatic control, to ensure the stable operation of the equipment and the use of coal water mainta
37、ined at about 8.5%.(3) The touch screen control system, the operation is more simple, fast, user-friendly. Realization of remote monitoring and data communication, can realize the technical personnel to realize start-stop operation, monitoring equipment in various parts of the control action and eac
38、h actuator devices in the control room can, configuration screen configuration computer system can real-time monitor control system running status and can realize the report function, easy to maintain and repair equipment.(4) The touch screen configuration control systemThe configuration control sys
39、tem:here omitted6. Pipeline and coal conveying system:(1) Pipeline system:According to the system requirement is calculated and combined with a large number of experiments to the total gas pipeline design:The pipe diameter of D=2.5 meters. Carbon steel, 10 mm wall thickness.Each branch pipeline pipe
40、 diameter D=0.6 meters. Pipeline are made of carbon steel materials, wall thickness of 8mm.Heating flue gas fan: pipe diameter D=1.5 meters. Carbon steel, wall thickness of 10mm.The rest of the carbon steel pipe, wall thickness 10 mm.(2) The coal conveying system:Coal conveying system of the conveyo
41、r sent to the high water content of wet coal in fluidized bed, removing a portion of the water by the feeding device, the discharging device. Loading to the conveyer belt, and then sent to the coal for coking tower, furnace.Coal conveying system comprises a bunker, belt conveyor and the corridor, cl
42、osed design.In view of the waste heat flue gas quantity is limited, in order to make full use of the hot flue gas, should guarantee the humidity adjusting device for continuous operation, therefore, wet coal materials and humidity after coal to continuous, a humidifying device.7. Dust removal device
43、:(1) Cyclone dust collector:The cyclone dust collector is a device by the centrifugal force produced by the rotating flow dust particles from air separation, mainly used for the separation of particle size is larger than the particles of 50 m above. Its characteristics are: simple structure, small o
44、ccupied area, low investment, convenient operation and repair, but the pressure loss is larger, the power consumption is large. Combined with the characteristics of this project, considering the separation efficiency, one-time investment of size and power consumption, the cyclone dust collector is a
45、dded after the bag dust collector, and optimum design.The cyclone body is made of carbon steel, thickness 6mm, lining wear resistant stainless steel plate wear. External thermal insulation device.(2) Bag dust collector：Through the gas cyclone separation after also contains a large number of fine pul
46、verized coal, the use of bag filter dust after further purification,through the chimney emissions.8. Power supply:The project of electricity load of about 700KW, 380V or 10KV power supply, the power supply scheme remains to be further implemented with your company.9.Safety and fire protection:(1)The
47、 main area of hidden dangerThe operator station in various running beside the equipment such as machine, charging and discharging devices are mechanical injury caused personal injury risk, this is unsafe factors in the production of.(2) Humidifying device is higher, higher position of the platform a
48、re designed to meet the needs of equipment installation or operation, may happen, object crash.(3) The installation or maintenance of equipment, can produce collision process of hoisting equipment spare parts.(4) The high temperature gas, high temperature equipment and pipeline may produce the scald accident.(5) All electrical equipment and facilities may cause casualties because of false touch, may also be due to electric spark caused by fire.(6) The construction process is easy to cause the main potential areas of danger construction electrical wiring, the scene of various electrical