Application of coal processing and comprehensive utilization of low-temperature waste heat power generation technology in kiln decomposition kiln Xia Junsheng (Xinwen Mining Group Huafeng Coal Mine, Shandong Xintai 271413) potential, process, social and economic benefits; analysis believes that The low-temperature waste heat power generation project is conducive to improving resource utilization and reducing environmental pollution. It is an effective way to save energy and reduce consumption in the cement industry. The cement industry is a large energy consumer, and the energy consumption in cement production costs accounts for more than 30% of the production cost. In view of the shortage of energy in cement production, high cost and low efficiency, since the 1980s, China's cement companies have done a lot of energy-saving work in the aspects of calcination, grinding, drying, waste heat utilization, and electricity saving, and achieved remarkable results. But there is still a big gap compared to the level of advanced countries. With the continuous improvement of the technology and equipment level of the cement industry, the decomposition outside the kiln is becoming more and more popular, and the temperature of the exhaust gas is low. How to economically and reasonably utilize the thermal resources contained in this part of the exhaust gas for power generation has been listed as a key scientific and technological development project by the state. Xinwen Mining Group Huafeng Coal Mine has a new dry-process cement clinker production line with 2500t/d cement clinker decomposed outside the kiln. The new 5000t/d dry-process cement clinker production line under construction will be put into operation in the near future. After the merger of the first and second phases, 400,000 tons of coal gangue and 480,000 tons of fly ash can be used annually, and the annual output of clinker is 2.4 million tons. The annual output of Pu-P.042.5 and P.032.5 cement is 3 million tons. Thermal energy in cement production process, reducing production cost Huafeng Coal Mine has analyzed and demonstrated that it adopts flash-composite power generation technology, that is, waste heat from exhaust gas discharged from kiln head cooler and waste heat from kiln preheater to recover heat energy in production process. It is used for power generation, which not only improves the utilization rate of coal, but also transforms it into high-quality energy-electric power, supplements production electricity, and more effectively reduces cement production costs. It is an effective way for energy saving and consumption reduction in cement industry. He graduated from Shandong University of Science and Technology with a bachelor's degree in mechanical engineering and an engineer from Huawen Coal Mine Management Information Center of Xinwen Mining Group Corporation. Tel: 1 Huafeng Mine Cement Plant Waste Heat Power Resource Condition Cement Kiln Decomposition Kiln, Low Temperature Waste Heat Steam/Heat The water flash evaporation project is to use the 7500t/d cement dry process to produce waste heat from the decomposition kiln outside the kiln, convert it into electric energy, and then supply it to the production system of the cement kiln, which accounts for more than 30% of the total system electricity consumption. It can greatly compensate for the huge power consumption of cement kiln. The power generation system is simple. The utilization rate of the power generation equipment is almost synchronous with the production of cement. The heat resources come from the waste heat of the cement kiln head and the kiln tail. It is a medium- and low-grade high-quality heat source continuously and stably provided with the operation of the cement kiln. The waste heat power generation complete set can be arranged around the cement kiln without having to choose another site. The transportation and installation of power generation equipment can utilize the original conditions without additional investment. Water and electricity (including the start-up electricity) of the power generation unit must be supplied by the water and power supply of the original cement plant. 2 Waste heat power generation process The waste heat power generation system is different from the conventional thermal power generation system. Its power generation heat source comes from the mother equipment of the cement kiln, that is, the waste heat from the kiln head cooler and the waste heat from the kiln preheater. The two waste heats enter the waste heat boiler of the kiln head and the kiln tail respectively, and heat the working water of the heating surface of the furnace, so that most of the working medium becomes superheated steam, and part of it becomes underheated water. The underheated water passes through the secondary flasher, producing two pressures of saturated steam. The main steam (superheated steam) and the two kinds of saturated steam are used as working medium to enter the three steam turbine generator sets to generate electricity. The steam that the steam turbine exhausts into the condenser condenses and enters the deaerator to remove oxygen together with the saturated water discharged from the flasher. The feed water pump is input into the waste heat boiler to form a closed circuit of the working fluid. Exhausted by waste heat boilers; t Xia Junsheng: Application of medium and low temperature waste heat power generation technology in the kiln decomposition kiln to discuss the cooled exhaust gas, in the kiln tail part, according to the cement process requirements into the raw material mill as a desiccant, in the kiln head part Then, it is discharged into the atmosphere after passing through the electrostatic precipitator of the existing system. A cooling tower is arranged near the main building. The monitoring of the power generation system is controlled by computer, and the CRT and printer are arranged in the central control room of the existing cement kiln for monitoring and operation. The construction of the additional power generation unit is carried out without affecting the normal production of the cement kiln. After the installation of the complete set of equipment, the connection of the power generation system and the parent body is completed by the connection of the pipeline, so that the kiln stop time is compressed to the shortest. The power of the waste heat power generation is connected to the power grid of the plant, and the external power supply is used as a backup. According to the above process, a complete power generation unit is installed near the 7500t/d cement kiln, mainly consisting of a PH waste heat boiler and an AQC waste heat boiler, a set of three steam turbine generator sets and two flashers. composition. The rated power generation of waste heat power generation is 13950kW, and the annual power generation capacity is 112.95 million yuan. 3 Investment and Benefit Analysis 3.1 The investment is 101.8 million yuan and the working capital is 17.6 million yuan. 3.2 Benefit Analysis 106kW. The electricity price is 0.488 yuan. h (including basic electricity price) annual income of 5,281,600 yuan. 50,000 yuan; wages and welfare: 52 employees, annual average salary of 12,000 yuan, total annual salary of 624,000 yuan; depreciation: fixed assets investment of 101.8 million yuan, depreciation period of 18a years of depreciation of 5.65 million yuan 5 yuan, the annual management fee is 378,700 yuan; 007 yuan eight W 4i ten, the annual amount is 950,000 yuan. The medium and low temperature waste heat power generation project is a pure waste heat power generation project. Since the waste heat utilization does not cause any pollution, it is equivalent to reducing the harmful substances (including dust, S2, NOx and emissions emitted by the power plant under the same power generation conditions for the environment). C2, etc., alleviate the pollution to the environment; at the same time, because the higher exhaust gas temperature is reduced to about 90C by the power generation mode, the thermal pollution to the environment is also reduced; in addition, especially for the kiln exhaust gas, the exhaust gas is not After passing through the wet tower, in addition to saving water resources and part of the power, it also improves the dust removal effect of the discharged low-temperature dry flue gas in the dust collector. It can be seen that the social and environmental benefits of the medium and low temperature waste heat power generation projects are extremely significant. 4 Conclusions 7500t/d cement kiln external decomposition kiln medium and low temperature waste heat flashing composite power generation project, the waste heat has been fully utilized, the total annual power generation is 112 106kW. The annual sales income is 5,281,600 yuan, and the annual net profit is 5,590. 60,000 yuan, annual profit and tax of 61.714 million yuan, 52 resettlement personnel, not only save energy, but also greatly reduce the cost of cement production is the best way to save energy and reduce consumption in the cement industry, will be the development of cement enterprises structural adjustment and energy conservation work Play a positive role. In addition, there are no dust, S2, C2 and other harmful substances emitted by coal-fired power plants, which reduce the pollution to the environment, truly achieve the goal of comprehensive utilization of resources and energy-saving, and have good social and economic benefits. China has identified 13 large coal bases and 13 large coal bases planned for construction in China have been identified. These 13 bases involve 14 provinces and districts with a total area of ​​103,400 km2. The coal reserves of more than 40 major mining areas (coal fields) accounted for 709.8 billion tons of coal reserves. 70. The target of large coal base construction is: By 2005, coal production reached 1.1 billion tons, accounting for 57% of the country's coal output of 1.93 billion tons, forming a large-scale enterprise group with a production capacity of 2-3 billion tons and 6-7 batches of 50 million tons of production capacity. Large-scale enterprises; by 2010, coal production reached 1.7 billion tons, accounting for 78% of the national coal output of 2.17 billion tons, forming a large-scale enterprise group with a capacity of 5 to 600 million tons and 5-6 sets of 50 million tons of production capacity. Large enterprise. (é’±ä¼¯ç« ) Curtain Wall Roll Forming Machine Curtain Wall,Windows And Curtain Walls,Processing And Manufacturing,Exterior Wall Curtain Wall Huai'an Senyu Intelligent Technology Co., LTD , https://www.jshasyzn.com