The method of hot water knowing the technology and the method of living hot water, the production of speculation continues to expand people today. Large energy consumption has increasingly become a point of attention for people. How to save energy and improve costs will become an urgent lesson. To save energy, a good energy-optimized design is a prerequisite for reducing energy consumption during operation. Here I have encountered the design examples I have talked about in the industrial plant air compressor compression heat heat 1 air compressor heat calculation air compressor is a constant power equipment, it and the air conditioning chiller are the factory's large power consumption. Usually, the air compressor is discharged but the tower is released into the atmosphere. This part of the energy is converted by electric energy and Song is wasted.
The gas compression process of the air compressor can be regarded as an adiabatic compression process, and the temperature relationship is calculated as follows: the absolute temperature of the air before the T-clamping. 1 The absolute pressure of the gas after Pz compression is the absolute pressure of the air before the compression of Pi. For the medium gas, the cooling process of the medium gas after the 1.41 card shrinkage is constant pressure cooling, and the heat release amount is calculated by the following formula to calculate the body enthalpy of the gas sucked by K. q, the constant pressure ratio of medium gas is 1.05; the temperature of air after tQ cooling, that is, the exhaust temperature of air compressor. Generally than the ring, the temperature of the air before cooling t2, 2 = 273.
For example, a narrow press with a table power of 250 free displacement and a discharge force of 7.510 is used. Calculate it, the heat takes the ambient temperature 20, the card force is 9.81 plus, the relevant data is substituted into the above formula, and the cooling of the machine can be calculated. The heat is 2141, and the temperature before the compressed air is cooled up to 265 can be seen. The cooling and cooling of the machine is not only large, but also high in temperature and completely recyclable.
2 Recycling of air compressor heat dissipation In the design process of a semiconductor packaging factory, the author made full use of this part of the heat in the air conditioning winter fresh air preheating, the pure water preparation process raw water winter preheating, etc. There are 4 empty card machines with a discharge pressure of 7.51, and 3 of them are used. According to the previous calculations, the three air compressors will have 6421 heat dissipation at the same time.
This part of the heat is recycled in the winter, used to heat and heat the air conditioning fresh air for the raw water to prepare pure water. The heat load of the pure water workshop is 3501, and the fresh air heat load of the air conditioner is 280. The total of 630 is changed to ensure the normal operation of the air compressor in the season. In the cooling tower system system setting, the cooling ± bridge is still selected according to the heat dissipation of the three air compressors at full load to cope with the heat dissipation requirement when the above-mentioned thermal load is zero.
It can be seen from 1 that compared with the simple air compressor cooling system, the system has added control devices such as pumps and heat exchangers and valves to control the switching device, so that the initial investment of the equipment is slightly increased, but the recycling with the 6301 tearing The heat is completely negligible.
3Using the heat dissipation of air compressor to realize the regenerative electronics of the adsorption dryer, the quality of compressed air is relatively high. In addition to the limitation of impurities such as particulate matter, it is also very sensitive to the water content of the gas. Most processes require atmospheric pressure. The dew point is below 40, and the requirement is high or even lower than 70. In this case, a suction drier must be used. And the suction of the rigid dryer, two ways. You are born with a fever and a fever. No heat regeneration requires a certain amount of compressed air. Usually, for the dew point 40, the average air consumption of the dryer regeneration is about skill. This is not a small power consumption. If the heat is collected, then the heat source is needed. Air compressor compression heat comes in handy. The partially compressed high-temperature compressed air that has not been cooled by the air compressor aftercooler is taken out and sent to the adsorbent of the dryer for regeneration. After the regeneration, the high-temperature gas containing the large test moisture is cooled and dried. With the dry compressed household dry process 2.
Now some manufacturers of air compressors have integrated the above benefits in their products. Corresponding hot air take-off interface and lead-in interface are respectively set on the compacting machine and the ten-dryer, so that the system becomes simple and the installer only needs to connect the two. 3 is a printed circuit board factory using this type of air compressor and ten dryer and the heat of the cooling water into the recovery of the hot air 2004, the energy project, the heat in this case, reflected in the gas system And cooling water system two aspects. The temperature of the compressed air required to enter the adsorption dryer should not be too high. Therefore, a stage after-cooler is added to the outlet of the air compressor, and the temperature of the process cooling water of the project is cooled by 18, respectively. The temperature of the gas entering the dryer does not exceed 35 water system. According to the temperature of the hot user, the two-stage heat is applied. The air conditioning hot water with water temperature of 90, 60 is heated first, and the remaining heat is used. To preheat the supplementary water of domestic hot water. The setting of the two-stage cooling tower fully ensures that the water supply temperature of the cooling water does not exceed 35.
4 Summary recovery, used for winter air conditioning fresh air preheating, pure water workshop heating and preheating of domestic hot water, etc., can also be used as control drying device for adsorption dryer equipment and doors, inevitably, added Jiji investment And the layout of the road is complicated, which is very worthy of 1 writing group compared with the economic and social benefits brought by heat recovery. Compressed air station design manual elbow. Beijing Machinery Industry Press. 1993.
2 Qiu Xinli. Lian Leming. Li Li can. Engineering thermodynamics elbow. Beijing China Building Industry Press, 1992.
A large number of air compressors in industrial plants can be reported to the state to introduce tax incentives to encourage wind power generation. With the approval of the State Council, the Ministry of Finance and the State Administration of Taxation jointly issued a document to implement the preferential policy for power generation, which should be reduced by half.
According to the new tax policy, China's wind power prices will drop by an average of 1 on the power of China. The power of the power generation is 60.9 yuan per kWh, making it difficult for wind power generation to compete with conventional power, coal, electricity and hydropower.
The cost of wind power generation is mainly the investment cost of fixed assets, accounting for more than 85 of the total investment. According to China's VAT deduction policy, the value-added tax on fixed assets investment cannot be deducted. Wind power implementation 17 This wind power actual tax rate is significantly higher than thermal power generation.
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