The conclusion that the application of energy saving and emission reduction measures should be emphasized in the design of air compressor system is mentioned.
1 Overview Compressed air is one of the most widely used sources of power in the industrial field.
It has many advantages such as safety, good regulation performance, convenient transportation, etc. It is widely used in industrial fields such as modernization and automation. To get good quality compressed air, it takes energy. However, most compressed air systems have low operating efficiency and serious energy waste due to various reasons. This requires us to have energy-saving concepts and measures in the design and equipment selection of compressed air systems, and fundamentally reduce energy consumption, which is in line with the requirements of domestic energy-saving emission reduction, and also meets the development trend of low-carbon economy in the world.
One of the main directions for energy saving in compressed air systems is the waste heat recovery of air compressors.
The necessity and feasibility of heat recovery The heat utilization that we generally use in design is to heat the compressed air exhaust vents and discharge them indoors during the winter. This exhaust air temperature is about 40C, and can only be released into the room. As a supplement to the heating load, because the outlet pressure is very low, only 6mm water column can not meet the resistance loss of any heat exchanger. impossible.
The heat recovery referred to herein refers to the heat recovery of the compressed heat of the compressed air body.
According to industry survey and analysis, in the composition of air compressor system operating costs, electricity consumption (electricity) accounts for about 77%, and almost all system waste is ultimately reflected in electricity bills.
When the air compressor is running, a large amount of heat of compression will be generated. The energy consumed by the compression heat accounts for 85% of the operating power of the unit. If this part of the heat of compression is not exchanged, it can cause high temperature of the motor and high temperature of the exhaust gas, which not only affects the use of the air compressor. Lifespan affects the quality of compressed air. If the heat is directly discharged from the cooling system, it will not only waste energy but also cause thermal pollution.
For example, according to the structure and principle of different types of compressors, properly reforming them, recovering heat, and combining them with the actual conditions of the factory, then it can turn waste into treasure, and collect and use the heat that was originally discharged into the environment, which can be reduced. Fuel consumption.
Air compressor waste heat is mainly used in the following aspects: it can be used as heating for other liquid media;) can be used as preheating for boiler hydration;) into central air conditioning system; domestic hot water and floor heating water.
Principle and composition of the heat recovery system The heat recovery system includes a heat exchange system, a pressurization system, a water source, and an insulation storage system. Because the air compressor's on/off switch is not uniform, it has a lot to do with equipment configuration and plant usage. Therefore, it can be considered that the heat source is messy per unit time, but it is a stable heat source in the long run. At the same time, the heating and sanitary hot water load is also uneven. Therefore, in order to alleviate the contradiction, there must be sufficient insulation preservation method, that is, the heat preservation water tank. The heat recovery system is a redundant system. When the water temperature of the insulated water tank reaches the set temperature or is stopped, the cooling of the air compressor can be switched to the original air-cooled or water-cooled form. see.
In a factory in Suzhou, two air-cooled fuel injection screw air compressors were selected, one electric power was 37kw power frequency, and one was 37kw frequency conversion. The two air compressors run from 7:30 to 16:30 per day, with a running time of 9 hours and an average loading rate of 80%. The residual heat of the two air compressors is recovered, and the hot water with the highest temperature of 80C is produced, which fully meets 60. People need to take a shower after work. Workers wash bath water storage temperature 60C, average bath hot water volume 80L / person; summer hydration temperature 2 heat energy recovery rate of shaft power 6 4.3 thermodynamic analysis day; 3) air compressor recyclable waste heat: Q2> Q1, so Recycling the residual heat of the two air compressors can meet the requirements.
4.4 see the system form.
4.5 Analysis of Investment Return 4.6 Effect After installing the heat recovery system and after preliminary operation, according to the understanding of the use of the site, the actual water temperature of the water storage tank can meet the design requirements, sometimes up to 80C, and the heat stored after one day of operation of the air compressor It is fully capable of meeting the intended use requirements. The goal of energy saving and emission reduction has been achieved.
Safe, hygienic, convenient and practical. It does not produce carbon monoxide, sulfur dioxide, black smoke and noise, oil, etc., and does not pollute the atmosphere.
Economic Operation. Improve the operating efficiency of the air compressor and implement the economic operation of the air compressor.
Reduce air compressor maintenance costs. The reduction of the working temperature of the air compressor reduces the failure of the machine, prolongs the service life of the equipment and reduces the maintenance cost.
d Possible disadvantages and disadvantages of the heat recovery system 1) When the air compressor does not work for a certain period of time, the heat source cannot be provided, and if there is heat supply demand, it may not be satisfied. In the summer, the air compressor has a large heat output, but at this time, the hot water demand is less, and the heat recovery device utilization rate is lowered.
Pipeline loss, air compressor room because of noise and other reasons, often placed close to the gas point but away from the office and living area, so transport losses need to be considered.
Compressed air system is a simple system in power engineering design, but energy saving measures can be applied in all aspects of this system, as long as we pay attention to observation in the design process, seriously summarize, in line with people-oriented, energy saving and emission reduction By effectively linking the air compressor system with other systems, it can reduce the cost of the enterprise, save energy consumption, improve the working environment of employees, and reduce carbon emissions, waste heat emissions, and pollutant emissions.
Xing Zhitao, male, engineer, graduated from Shanghai University of Technology in 2000 with a major in refrigeration and cryogenics. He is currently working for China Aviation Planning and Construction Development Co., Ltd.
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