Application of Air Compressor Heat Recovery System in Huibaoling Iron Mine

Application of AM 揠 air compressor heat recovery system in Huibaoling Iron Mine Cao Guanghai (Shandong Energy Lining Group Linyi Huibaoling Iron Mine Co., Ltd., Cangshan 277712, Shandong Province) provides a basis for the recovery and utilization of similar heat exchangers in mines.

1 Composition of heat recovery system 1.1 Energy loss of screw air compressor Overview Four water-cooled screw air compressors are installed in Baoling Iron Mine Air Compressor Room, each with a power of 330kW. The screw air compressor has its own design structure and working principle. It is decided that the adiabatic efficiency of the pressure fan is between 0.65 and 0.85. For the air compressor, the design oil supply temperature is generally 50~60*C, and the actual exhaust gas temperature is often 80, the high exhaust temperature. It will cause more lubricating oil to be in the gas phase, which will increase the difficulty of oil and gas separation and reduce the service life of lubricating oil. In addition to the energy loss caused by mechanical wear, it is mainly due to the thermal energy loss of thermal energy conversion during compressed air. The adiabatic efficiency of the compressor is only 60-80%. Usually only 20-30% of the energy in the actual operation of the compressor becomes the air potential energy. Most of the energy is consumed in various forms, most of which become heat released into the air.

1.2 Working principle of waste heat recovery machine of heat blower The heat energy recovery machine is a machine that uses high temperature oil and gas heat energy in air compressor to transfer heat energy to normal temperature water through heat exchange to realize energy recovery. The main purpose is to connect the high-temperature circulating oil (and high-temperature compressed gas) into the heat recovery unit, and fully absorb the heat energy generated during the operation of the air compressor, and heat the water. In this process, the heat medium oil and the compressed air are cooled, and the cold medium water is heated, and the circulating water pump is passed through to ensure that the hot water reaches the set temperature and then the hot water is sent to the water storage tank for use. The system is also equipped with constant temperature heating control to ensure that the hot water in the water tank can always meet the requirements.

1.3 Thermal energy recovery system The thermal energy recovery system utilizes two sets of air compressors, which are designed in parallel. The system is put into equipment and materials: the air compressor waste heat recovery machine and the energy recovery machine are connected to the air compressor system, and the circulating water pump is connected to the original pressure fan system. Booster pump frequency conversion power distribution system; water level electrode, temperature probe, water supply solenoid valve, heat preservation water pipe, double-layer stainless steel circulating insulation water tank and auxiliary materials.

-), male, engineer, university degree, graduated from Shandong University of Science and Technology, majoring in automation, and now works in the engineering department of Linyi Huiling Iron Mine Co., Ltd.

1.4 The use of hot water The pressure of the circulating water pump is used to pass the cold water through the air compressor waste heat recovery machine, and the heated hot water is sent to the heat preservation water tank, and the temperature of the circulating water pump is automatically regulated by the temperature probe in the water tank, and the water level in the water tank is controlled. The interlocking control hydration solenoid valve keeps the temperature of the water tank within the shower temperature range.

2 System operation characteristics 2.1 Energy-saving and environmentally friendly air compressor The heat energy recovery system has the characteristics of no noise and no pollution. As long as the air compressor is running, hot water can be extracted at any time without the need for regular metering by other heating equipment.

2.2 Equipment safety maintenance Less products adopt advanced high-efficiency heat transfer technology and mature detection means, which greatly reduces the pressure loss on the oil circuit and ensures the normal operation of the air compressor system. The series heating system process ensures that the heat recovery unit does not affect the normal operation of the air compressor when it stops or fails.

2.3 Improve air compressor operation and improve air purification quality The air volume of screw air compressor will decrease with the increase of unit operating temperature. The air compressor heat recovery system can reduce the air compressor temperature by 8~12*C, which can improve The gas production is about 8%. Due to the increase in production, the number of movements of pneumatic components will be improved and more precise, sensitive and stable, so that the production line will be increased accordingly, and the quality of the products will also provide a reliable guarantee.

2.4 Improve the service life of the air compressor The air compressor heat recovery system reduces the compressor operating temperature, reduces the machine failure rate, extends the service life of the equipment, and reduces the maintenance cost.

3 Calculating energy consumption and energy saving situation After a year of operation, Baoling Iron Mine will consume 50 tons of water per day for employees, and the annual average temperature rise will be 5~55*C, with an average of 50*C, and the average energy consumption per hour is 435,417kJ/h. , about 121kWh, 330 days of energy saving 957,917 kWh, can save electricity costs 689,700 yuan, the annual energy saving is equivalent to standard coal 141.6t. AM揠 Shandong Heze coal gangue power plant 12th Five-Year Plan Zhou Haibin, Liu Jing (Jinan Design Institute of Coal Industry Co., Ltd., Jinan 250031, Shandong, China) The level of use achieved the purpose of waste utilization, energy saving and emission reduction.

1 Necessity of project construction Coal gangue is solid waste generated during coal mining, washing and processing, and is also a resource that can be utilized. At present, China's coal gangue has reached more than 3 billion tons. There are more than 1,500 meteorites in state-owned coal mines, covering an area of ​​12,000 hm2, accounting for more than 40% of China's total industrial solid waste discharge.

With the continuous increase of national environmental protection law enforcement, people's environmental quality requirements have been improved, and the problem of solving coal gangue pollution has become more and more prominent. Coal gangue power generation is to make full use of the effective heat component of coal gangue, turning waste into treasure and solving An effective way of pollution.

2 Overview of coal resources in Heze area Heze City mainly includes Juye Coalfield, Liangbaosi Coalfield (Heze Part) and Danxian Coalfield. The mine development in the jurisdiction is relatively late, and many pairs of mines are in the construction stage. The coal seam is thick and the coal quality is excellent. It is the coal production base of Shandong Province. The proven coal-bearing area of ​​the city is 1039.66km2, and the accumulated proven reserves of coal and natural coke are 5.342 billion tons. During the 12th Five-Year Plan period, the development stage of coal mine construction in Heze City will be completed and put into operation in this period. 18.3 million t/a. 3 Electricity Demand Shandong Province is an important province with large population, a large resource province and a large economic province. According to Shandong's economic development situation and power demand, to 2015-), male, engineer, graduated from the Electrical Engineering Department of Shandong University of Science and Technology in 2001, and now Jinan Coal Design Institute is engaged in electrical professional design.

4 Conclusion The scope of application of the system: wet screw air compressor, refrigeration compressor, process compressor and so on. The total investment of the system is about 400,000 yuan. The thermal energy recovery of the Huibaoling iron ore pressure fan is used in the cold water heating system. The economic benefit is remarkable. The air compressor heat recovery system is iron t, and the annual power generation is 4.5 billion kWh. Saving 732,000 tons of standard coal, improving the resource comprehensive profit year, it is estimated that the maximum load of the power grid will reach 82,500 MW. Considering the approved outside calls, the power shortages in 2012 and 2015 are still: 7860 MW, 26514 MW. The average annual growth of load is 15.3% and 15.7%. During the “Twelfth Five-Year Plan” period, the average annual growth rate of the total social power consumption and net supply in Heze City is 15%. By 2015, the total electricity consumption in Heze City reached 19.7 billion kWh. The maximum load is 3,820 MW. According to the load forecast and installation plan, the balance of Heze 220kV power grid is shown in Table 1. It can be seen from Table 1 that the power shortage of 220kV power grid in Heze in 2010 is 390~720MW; Zhaolou coal gangue power plant, Guodian Longgu coal gangue power plant After operation, it can guarantee the surplus of Heze 220kV power grid. Therefore, the construction of two coal gangue power plants is indispensable for the Heze power grid.

4 Project Planning According to the Heze City Mining Area Arrangement Plan, two coal gangue comprehensive utilization power generation projects will be constructed during the period from 2011 to 2015, which will be the second phase project of Zhaolou Coal Gangue Comprehensive Utilization Power Plant (1x300MW) and Guodian Longgu Coal Gangue in Juye Mining Area. Use power plant (2X300MW). Both power plants rely on the mine construction pit power plant, which is a new power plant and uses a circulating fluidized bed boiler. The planned total installed capacity is 900MW, and the annual power generation is 4.5 billion kWh. 4.1 Zhaolou Power Plant According to the fuel profile, the power plant is planned to use fuel as washing and mixing coal: slime: coal gangue: natural coke is mixed in a ratio of 0.2:0.26:0.34:0.2. The low calorific value of fuel is about 12. The power plant needs about 2.6 million tons of fuel per year, including 518,200 tons of coal blended, 673,200 tons of coal mud, 789,000 tons of coal gangue, and 518,200 tons of natural coke. It satisfies the bathing of employees throughout the company. The annual energy saving is equivalent to 150t of standard coal, and it also increases the exhaust volume and reduces the fan operation. The energy saving cost of its own operation exceeds 20,000 yuan per year, and its energy saving and emission reduction effect is very obvious. The national energy conservation and environmental protection policy provides a reliable basis for the thermal energy utilization of similar mine pressure fans.

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