Power Xing Zhitao Li Wei China Aviation Vision Fantasy Development has a conclusion that the application of energy saving and emission reduction measures should be emphasized in the design of air compressor system.
2 Overview Compressed air is the most widely used power source in the industrial field.
It has many advantages such as good safety regulation performance and convenient transportation. It is widely used in industrial fields such as modern 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.
The main direction of energy saving in compressed air systems is the waste heat recovery of air compressors.
Necessity and Feasibility of Heat Recovery The waste heat used in our design is to dissipate the heat from the compressed air exhaust vents to the interior during the winter. This exhaust air temperature is about 401, can only be released into the room, as a supplement to the heating load, because its outlet pressure is very low, only 6, water column, can not meet the resistance loss of any heat exchanger, rely on its heat transfer It is 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 air compressor system operating cost composition, electricity consumption electricity costs accounted for about 77, almost all system waste is ultimately reflected in the electricity bill.
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 service life of the air compressor. It also affects the quality of compressed air. If the direct cooling system discharges heat, 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.
The residual heat of air compressor is mainly used for heating other liquid media in the following aspects; it can be used as preheating for boiler hydration; it can be used in central air conditioning system; domestic hot water and floor heating water.
The original flavor of the flight, the principle and composition of the heat recovery system The heat recovery system includes the water source of the heat exchanger system pressurization system and the heat preservation and 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 stops using, the cooling of the air compressor can be switched to the original natural gas calorific value of 8500阢4102 3, the unit price is 2.2 yuan 舢3 summer hydration temperature 25 winter 5 Spring and Autumn 15, the heat recovery rate is 60% of the shaft power; 4.3 Thermodynamic analysis of the residual heat of the air compressor can be recovered 4 engineering examples, 2, therefore, the waste heat of the two air compressors can be recovered to meet the 4.1 project overview of a factory in Suzhou, select 2 Typhoon cold injection oil screw air compressor, the power of the station is 37kw power frequency, and the stage is 37kw frequency conversion. The two air compressors run at a daily time of 73,016,30, 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 a maximum temperature of 801 is generated, which fully meets the needs of 60 people to take a shower after work. Workers wash 4.2 analysis based on the heat required for each ton of water to increase; bath water storage temperature 60., the average bath hot water volume 801 person times; requirements.
After the heat recovery system is installed 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, and sometimes the heat stored after the operation of the 80 air compressor can reach the predetermined use requirements. The goal of energy saving and emission reduction has been achieved.
Safe and sanitary is convenient and practical. It does not produce oxidized carbon sulphur 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.
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 summer, the air compressor has a large heat output, but at this time, the hot water demand is less, and the utilization rate of the heat recovery device decreases.
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 as the goal, By effectively linking the air compressor system with other systems, it is possible to reduce the cost of the enterprise, save energy consumption, improve the working environment of employees, and reduce emissions of waste heat from carbon emissions. Xing Zhitao, engineer, graduated from Shanghai University of Technology in 2000. Low temperature technology, now working for China Aviation Planning Construction Development Co., Ltd.
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