The use of coal technology and air-to-air machines is feasible. 4, Qi Shiwei, Yang Liufeng, Yang Peipei (Pangzhuang Coal Mine of Xuzhou Mining Group Co., Ltd., Xuzhou, Jiangsu 221006), also affects the quality of compressed air; Discharging its heat not only wastes energy, but also causes thermal pollution. The recycling of heat energy not only has a positive effect on the service life of the air compressor and the quality of the compressed air, but also enables the enterprise to obtain the required hot water, thereby reducing energy consumption, saving costs and improving economic efficiency.

1Proposal proposed Xuzhou Mining Group Co., Ltd. Pangzhuang Coal Mine Zhang Xiaolou well ground pressure fan room has a total of four MM200-2S screw compressor. In the working process of the air compressor, about 80% of the input electric energy becomes heat, and about 20% becomes the final compressed air energy. After the electric energy consumed by the compressor in the working process is converted into heat, most of the compressed air is compressed. The oil and gas mixture is carried away by the cooling medium (water or air) in the oil cooler and the air cooler, and the heat is wasted.

In order to do a good job in energy conservation and emission reduction, with the core of improving energy efficiency and reducing pollutant discharge, it was decided to use air compressor heat recovery system to achieve energy saving and emission reduction effects. Combined with the current status of the energy consumption of Zhang Xiaolou well bathroom, the feasibility of using the air compressor heat energy in Zhang Xiaolou well bathroom was proposed.

According to statistics, the annual steam consumption of Zhang Xiaolou's staff and staff is about 33,200 m3; the equivalent cost is about 8 million yuan.

2 waste heat recovery and utilization scheme 1 waste heat recovery and utilization technology principle The working principle of screw air compressor: air filters the dust or impurities in the atmosphere through the air inlet filter, and then enters the compressor main body through the intake control valve. The medium is mixed with the injected cooling lubricating oil, and the compressed mixed gas is discharged from the compression chamber into the oil and gas separation tank, thereby obtaining high temperature and high pressure oil and gas, respectively. And then sent to their respective cooling system, wherein the high temperature and high pressure lubricating oil is cooled by the cooler, and then returned to the oil circuit to enter the next cycle; and the compressed air is cooled by the cooler and finally sent to the pressure air use system. The heat of high temperature and high pressure oil and gas is roughly equivalent to 3/4 of the power of air compressor, and the temperature is usually between 80 and 100 feet.

The screw air compressor waste heat recovery system uses the heat energy conversion principle to convert the heat recovery from the air compressor into the water. After the water absorbs the heat, the water temperature will rise, which will lower the operating temperature of the air compressor unit, which not only improves the operating efficiency of the air compressor, but also prolongs the service life of the air compressor oil, and the heat generated by the air compressor can be obtained. Use, thereby reducing unit production costs and improving business efficiency.

2.2 Composition of waste heat recovery system A complete heat recovery system consists of heat exchange end, circulation end, hot end and system monitoring (see).

Temperature control valve oil circuit heat exchanger boiler preheating water remnant heat recovery system (1) heat exchange end: for different types of units, the recovery principle is different, the recovery rate is not the same. The oil screw machine utilizes the direct heat exchange of oil/water to directly displace the heat, and the recovery efficiency can reach 60% of the operating power of the unit. (2) The circulating end: according to the actual load ratio and the applied temperature requirement. Targeted design. According to the structure, it is generally divided into two types: straight-through heat transfer or cyclic heating. According to the control mode, it can be divided into fixed temperature control, constant temperature difference control and constant flow control.

(3) Application side: According to different application systems, the automatic switching between systems is reasonable.

Improvement of the replacement of the first rope in the auxiliary shaft hoist of coal double-well coal mine Zhang Hui\Wang Qiwang\Gao Hong 2 (1. Production Technology Department of Xuzhou Mining Group Co., Ltd., Xuzhou 221006, China; 2. Electromechanical installation of Xuzhou Mining Group Co., Ltd. Department. Jiangsu Xuzhou 221006) Rope, composite board, retractor, hydraulic motor drive rope roller application, using the old rope with new rope replacement program, implemented a new process of replacing the rope. The rope change time is more than 1/2 save than the traditional process, which is safe and reliable.

Replacing the floor-type friction hoist wire rope is one of the key maintenance projects for large-scale coal mine equipment. It has complex procedures, high labor intensity, high risk factor and long maintenance time. It is the largest maintenance project. If the construction is improper or the rope replacement process is wrong, the wire rope will be twisted and twisted, and the new wire rope and the old wire rope or the new wire rope and the new wire rope will be twisted together, resulting in damage to the new rope, seriously affecting the quality of the rope change, and may even The wire rope slips and breaks, causing a serious accident such as a falling tank.

(4) System control: It belongs to the high-end configuration and customization options of the system, including the automatic monitoring of multi-measurement monitoring, metering and related control components, and the online statistics function of energy recovery.

3 heat recovery expected effect Zhang Xiaolou well air compressor has 4 sets of MM200-2S screw compressor, motor power is 200 kW, the average air compressor runs 20h every day. According to the actual test data statistical analysis, air compressor function Lubricating oil containing 75% high temperature and high pressure is dissipated through the cooler. Calculated according to the air compressor running rate of 100% and the recovery rate of 90%, each MM200-2S air compressor can recover the heat load per hour to 200x75%x1%. X90%=135kW according to the heat calculation formula c water specific heat capacity J / kg - Zhang; AT temperature difference, Zhang.

According to the inlet water temperature of 10* and the production hot water temperature of 60 ft, the air volume generated per hour by each air compressor is about 2.3t; then the four new air shafts of the empty double-story coal mine are double-layered. Car (1t) cage, diameter of wellbore 6. 5m, wellbore bottom -750m, upper wellhead elevation +38.5m, truss derrick; JKMD-3.5x4 (IE) E-type floor-standing multi-rope friction hoist, maximum static The tension is 470kN, the maximum static tension difference is 140kN, the hoisting rope is 6VX37S+FC-36-1670, 4 pieces, 960m/root, 5279kg/root, the cage weight is 10500kg. The upper wheel center is higher than the ground elevation +28.5m, the lower wheel center is relatively The ground elevation is +21.5m, and the wellbore tank is a spheroidal steel combination tank.

The press can provide an average of 18.4t of hot water per day. The total number of employees in Zhangxiaolou is 2,000. In the coldest winter, the average daily hot water per person (>60 ft) is 70 kg, and the coldest workers in winter. The total amount of hot water required for the bathroom every day is 14 so that the hot water produced by the four air compressors can fully meet the needs of the Zhang Xiaolou staff.

4 Conclusion The air compressor heat recovery scheme can efficiently and safely and reliably recover the heat generated by the compressor by reasonably increasing the heat exchange equipment and control system and the externally added water chestnut and pipeline. The automation degree is high and the operation safety is safe. To reduce the emission of heat energy, to achieve energy conservation and cost reduction, to bring economic benefits and social benefits to enterprises.

He graduated from Hebei University of Technology, majoring in automation, master of China University of Mining and Technology, and assistant engineer of Pangzhuang Coal Mine of Xuzhou Mining Group Co., Ltd.

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