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Heat recovery analysis of air compressor system

time:2017-09-06 16:13:32source:Ziqi compressorauthor: 赵疆昆Clicks: 0
Compressed air is one of the most widely used power sources in the industrial field. With safety, good performance, easy delivery and many other advantages, in the modernization, automation and other industrial fields is extremely wide range of applicatio

 压缩空气系统热回收分析

 

  The conclusion that the application of energy saving and emission reduction measures should be paid attention to in the design process of air pressure system.

  An overview of compressed air is one of the most widely used power sources in the industrial field.

  It has many advantages, such as safety, good regulation performance, convenient transportation and so on. It is widely used in the industrial fields of modernization, automation and so on. To get high-quality compressed air, we need to consume energy, but most of the compressed air systems are inefficient due to various reasons, and the energy consumption is serious. This requires us to have the concept and measures of energy saving in the design and equipment selection of compressed air system, and fundamentally reduce energy consumption. This is not only in line with the requirements of domestic energy saving and emission reduction, but also in line with the development trend of low-carbon economy worldwide.

  The main direction of the energy saving of the compressed air system is the waste heat recovery of the air compressor.

  The necessity and feasibility of heat recovery is usually used in design when we use residual heat, which is to discharge heat from compressed air outlet to the indoor part in winter. The exhaust temperature is about 40C, and it can only be released into the indoor area, which is a supplement to heating load. Because its outlet pressure is very low, only 6mm water column can not meet any resistance loss of heat exchangers, so it is impossible to rely on heat transfer.

  The heat recovery referred to here refers to the heat recovery of compressed air in the compressed air.

  According to the industry investigation and analysis, in the air compressor system operation cost composition, electricity consumption accounts for 77%. Almost all system waste is ultimately reflected in the electricity bill.

  Air compressor operation will produce a lot of heat of compression, compression heat energy consumption accounted for 85% of the power plant operation, this part of the heat exchange compression if not out, can cause the motor temperature and exhaust temperature, not only affects the service life of the air compressor, affecting the quality of compressed air from the cooling system; such as direct heat emission. Not only a waste of energy, it will cause thermal pollution.

  For example, according to the structure and principle of different types of compressors, and retrofit them properly, heat recovery will be combined with the actual situation of factories, so that we can turn waste into treasure. We can collect and utilize the heat that was originally discharged into the environment, so that we can reduce fuel consumption.

  The residual heat of air compressor is mainly used for the following aspects: heating can be used as other liquid medium; it can be used as pre heating of boiler's water supply; it's used in central air conditioning system, hot water and warm water.

  The principle of the heat recovery system and the composition of the heat recovery system include the heat exchange system, the pressure system, the water source and the preservation and preservation system. Because the switchgear of air compressor is not uniform, it has great relationship with equipment configuration and plant usage. Therefore, it can be considered that heat source is chaotic in unit time, but in the long run, it is a steady heat source. At the same time heating and sanitary hot water load is not uniform, so in order to ease the contradiction, it is necessary to have enough preservation methods, that is, heat preservation water tank. The heat recovery system is a redundant system. When the water temperature of the heat preservation tank reaches the set temperature or stops, the cooling of the air compressor can be switched to the original air-cooled or water-cooled form. See.

  A factory in Suzhou, selected 2 typhoons cold injection screw air compressor, an electric power of 37KW power frequency, one for 37KW frequency conversion. The two air compressors run for 7:30~16:30 every day, the running time is 9 hours, and the average loading rate is 80%. After recovering the remaining heat of the two air compressors, the hot water with the highest temperature of 80C can meet the needs of 60 people after bathing after work. The workers wash storage water temperature 60C, average bath water content 80L/ million; 64.3 water temperature in summer 2 thermodynamic heat recovery rate of shaft power analysis on air compressor waste heat; 3) Recyclable: Q2>Q1, so the heat recovery of two air compressors can meet the requirements of.

  4.4 system form.

  4.5 return on investment analysis of 4.6 effect heat recovery system and installed after the initial operation, according to the use condition of the site to understand, the actual temperature of the storage tank can meet the design requirements, sometimes can reach 80C, a day after the storage operation of compressor heat can completely reach the predetermined requirements. The purpose of energy saving and emission reduction is achieved.

  It is safe, sanitary, convenient and practical. No carbon monoxide, sulfur dioxide, black smoke, noise, oil pollution and so on, no pollution to the atmosphere.

  Economic operation. The operation efficiency of the air compressor is improved and the economic operation of the air compressor is carried out.

  Reduce the maintenance cost of air compressor. The lowering 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.

  There are some shortcomings and shortcomings in the D heat recovery system. 1) when the air compressor does not work at a certain time, it cannot provide heat source. If there is heating demand, it may not be able to meet it. In the summer, the air compressor has a large amount of heat, but the demand for hot water is less, and the utilization rate of the heat recovery unit is decreased.

  Pipeline loss, air compressor room because of noise and other reasons, often set in close to the gas point, but away from the office and living area, so transportation loss needs to be considered.

  The compressed air system is a simple system in power engineering design, but such measures can be applied in all aspects of the system, as long as we observe in the design process, conscientiously sum up, people-oriented, energy saving and emission reduction targets, the air pressure system and other related system, will be able to reduce the enterprise cost, save energy, improve the working environment, reduce


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