To Changwei, Wang Jianbing (Shanxi Company, China Coal Comprehensive Utilization Group Corporation, Taiyuan 030002, China) Today, energy conservation has been mentioned as a very important height. Some people even call energy conservation "second energy." The implementation of energy-saving improvements by enterprises not only can alleviate the government's energy supply and construction pressure, reduce the pollution of waste gas to protect the environment, and more importantly, it can enable enterprises to reduce energy consumption and reduce their own operating costs.

For this purpose, our company focuses on the energy consumption research of enterprises, and establishes a relatively comprehensive resource utilization plan for the waste of residual heat and energy in the production process. After the waste heat is utilized, it is generally used in the fields of power generation, hot water for employees of enterprises, or fluid preheating for enterprise production. This paper is mainly for the waste heat recovery and utilization of air compressors. After use, it is used to heat the boiler feed water temperature, employees bathing, heating and production heat. This scheme is only for enterprises.

Air compressors are essential equipment for various factories, road construction, mining and construction industries. They are mainly used to provide a steady stream of compressed air to meet the requirements of the process. Among the many types of air compressors, screw air compressors have great market potential and are widely used in many industries.

Air compressor is one of the main production equipments necessary for China Coal's coal production enterprises. It is also one of the main power-consuming equipments, accounting for about one-tenth of the electricity consumption of enterprises.

The working process of the screw air compressor is divided into four processes of suction, sealing and conveying, compression and exhaust. When the screw rotates in the housing, the screw meshes with the groove of the housing, the air is sucked in by the air inlet, and the oil is also sucked in, and the sucked oil is sealed and transported to the exhaust port due to the rotation of the meshing surface; During the process, the meshing gap of the tooth groove gradually becomes smaller, and the oil and gas is compressed; when the meshing surface of the tooth groove rotates to the exhaust port of the casing, the higher pressure oil and gas mixed gas is discharged from the body. The schematic diagram of the air compressor structure is as follows ().

Machine 1 / E 绾 % When the air compressor is continuously running, the compressor body and oil temperature will rise.

Air compressor oil not only acts as lubrication, anti-pound, cleaning, sealing and buffering in the air compressor system, but also plays a role of cooling. When the oil temperature reaches a certain level (such as 80 fans start running, to reduce the host operating temperature.

The fan runs for a period of time, and the oil temperature drops, which is lower than the 751 Feng machine.

It can be seen that a large amount of energy input from the air compressor converts part of the mechanical energy of the prime mover into pressure energy of the gas through intense compression, and a large amount of heat is discharged as heat of compression while producing high-pressure air, and this part of heat accumulates in The oil, oil and gas and the body are taken away by the fan and discharged into the environment.

According to preliminary statistics, the oil and oil take away about 75% of the heat, the compressed air takes away about 10% of the heat, and the air compressor body takes away 5% of the heat. See below.

The power consumption is slightly 10Q%, the heat that can be recovered is about 90%, the heat of the motor is about 5%, the heat of the oil is about 75%, the compressed air is taken away, the heat is about 1, the non-recoverable loss is 1CJ%, and the air compressor is used to propose the air compressor. The temperature of the oil and gas mixture discharged from the body is generally as high as 80~951. If the heat cannot be discharged in time, it will cause serious damage to the equipment and affect the gas production efficiency; when the oil temperature upper limit is reached, it will also have a protective shutdown. Therefore, the air compressor is equipped with an air-cooled or water-cooled system for cooling. This process of forced cooling is actually a process of wasting energy.

Based on this situation, quite a number of enterprises realize the recycling of heat energy by adjusting the heat transfer mode. This kind of transformation can not only maximize energy recovery, reduce energy consumption, but also improve the gas production efficiency of the air compressor and prolong the life of the air compressor equipment.

Fourth, air compressor waste heat recoverable heat calculation (250kw as an example) Recently, the 250kw screw air compressor in the coal mine is investigated as an example, the college automatic control principle is professional, engaged in energy saving and emission reduction work.

Wang Jianbing (1980-), male, from Xingxian County, Shanxi Province, China Coal Comprehensive Utilization Group Corporation Shanxi Company, graduated from Taiyuan University of Technology, majoring in control theory and control engineering, engaged in energy conservation and emission reduction.

To Changwei et al.: The research and application of air compressor waste heat recovery are as follows: 1. Calculation conditions (1) The load rate is conservatively estimated by 0.65%; (2) The loading time is conservatively estimated according to 95% of the running time; (3) Power conversion The proportion of heat energy is conservatively estimated by 65%; (4) the heat exchanger efficiency is estimated by 90%; (5) the inlet water temperature is conservatively estimated by 5C; the estimated is 50L; (7) the winter heating heat load is estimated by 70w/m2.

2. Calculate the heat that can be recovered by the air compressor per hour. It is well known that the effect of water cooling is better than that of air cooling. Therefore, after the project is rebuilt, it will not affect the normal operation of the air compressor, and it can be extended. The operating life of the press reduces the amount of oil consumed and reduces the amount of maintenance.

The medium temperature water obtained by heat exchange of the water cooling system can be used as bath water or other domestic hot water. Thereby, the recovery of waste heat resources is realized.

The waste heat utilization project is mainly composed of four parts: (1) heat-efficiency heat exchange equipment, (2) intelligent control equipment, (3) water storage equipment, and (4) water supply equipment.

The air compressor transformation process diagram is shown below.

Check the unit conversion table to know that lkwh=860kcal, the heat supply for a single air compressor is: 3. The amount of heat recovered for the number of employees taking a bath is 40C hot water per hour: m=Q/(c* t) 4. The recovered heat is used to measure the heat recovered by the heating area. The heating area is: after the waste heat is recovered, it can meet the area heating of 1,290 m2.

V. Feasibility analysis of waste heat utilization technology 1. Design of waste heat utilization scheme Install a three-way electric valve on the air compressor oil cooling circuit to take out the oil pipeline, that is, the oil cooler of the air compressor is externally installed, and the original wind will be taken. The residual heat recovery of the air compressor of the cold system is mainly realized by the way of connecting the heat exchanger (tube-shell or plate type) into the original oil pipeline. A three-way solenoid valve is installed at the inlet and outlet of the crude oil road system, and the oil is taken out and then heat exchange is realized through the heat exchanger. In order to improve the safety factor, the scheme retains the original air-cooling system, that is, the air compressor waste heat recovery system is connected in parallel with the original cooling system. After separation by oil and gas, the separated high temperature gas directly leads to the original gas cooling system, and the separated high temperature oil is detected by the temperature sensor: if the high temperature oil temperature is lower than 76X:, no heat exchange is required, directly Through the filter to the oil circulation system, if the temperature of the high temperature oil is higher than 76C, heat exchange is required before entering the oil circulation system.

The system is equipped with a heat preservation water tank and a water storage tank (note: the water storage tank is not shown), and is respectively transformed into a water cooling system. The original air-cooling system continues to remain, still serving as a water supply tank and user water tank for the cooling system.

spare. The schematic is shown below. In addition, the control system has also established a series of guarantee measures such as the normal working mode and the special situation, the emergency treatment mode under the low oil, and the water quality and antifreeze.

VI. Conclusion In the past many times the country advocated energy conservation and emission reduction, with the innovation of science and technology, the research on energy conservation in the field of waste heat recovery has been rapidly developed, and the waste heat recovery of air compressors has been substantially developed and utilized. . Air compressor waste heat recovery has many successful cases in Shandong Energy Group and Yangmei Group. It turns out that the use of air compressor waste heat supply will not affect the normal operation of the air compressor, and it is very beneficial to the operation of the air compressor system. After the waste heat is recovered, the coal consumption is reduced, the pollution to the atmospheric environment is reduced, and the operating cost is very low, and the investment is endless. This technology is worthy of promotion in the enterprise, laying a foundation for creating a resource-saving and good-looking enterprise.

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