Feasibility analysis of waste heat utilization of Laigang Steel Air Compressor Di Peng, Pan Xinqing, Li Kehai, Zhu Shenghua (Energy Power Plant) can meet the requirements of subsequent processing. Molecular sieve regeneration gas requires higher temperature, electric heater has higher power and high energy consumption. The air residual heat of the air compressor is used to heat the regeneration gas of the molecular sieve by adding a preheater after the air compressor to reduce the power of the molecular sieve electric heater and reduce the energy consumption.
0 刖 èƒ½æº Energy Power Plant Tianyuan Gas Company is mainly responsible for the supply of oxygen, nitrogen and argon in various hotline plants of Laiwu Steel and the supply of various liquids. The oxygen generator adopts air as raw material, and is subjected to air compressor compression, molecular sieve adsorption purification, expander expansion refrigeration, and main tower rectification to obtain qualified gas and liquid products. The energy consumption in the production process is huge. Therefore, the waste heat recovery and utilization of air separation equipment and the reduction of energy consumption are of great significance for vigorously developing the circular economy.
1 Status 1.1 Air compressor gas temperature The air temperature of the high air compressor can reach about 100*C, and the air temperature of the air separation unit is not higher than 17 * C. Therefore, it is necessary to use an intercooler and an air cooling tower to lower the air temperature. Below 17C, this requires about 400 m3/h of circulating cooling water for cooling. It is also necessary to strictly control the temperature of the cooling water and the calcium and magnesium ion content. In order to reduce the temperature of the cooling water, it must be realized by a cold water tower and a freezer.
The cold water tower is a mixed heat exchanger. The higher temperature water is sprayed downward from the top of the cold water tower, and the sewage nitrogen from the main heat exchanger flows from bottom to top, and the two directly contact and heat and mass transfer. In terms of using the lower temperature of the sewage nitrogen to lower the water temperature; on the other hand, using the unsaturation of the nitrogen, the water molecules continuously evaporate and diffuse into the nitrogen, and the water evaporation process needs to absorb a large amount of latent heat of vaporization, the water temperature is continuously reduced, and the nitrogen is replaced. Directly vent after heat. This process requires a large amount of contaminated nitrogen and causes a lot of waste. The cold water tower supporting the freezer is powered by electricity-), male, graduated from Yantai University in 2007 with a major in thermal energy and power engineering. Assistant engineer, mainly engaged in cryogenic technology management.
It can reduce the temperature of the water at the bottom of the cold water tower to help regulate the water temperature. This process also consumes a lot of electric energy.
1.2 Molecular sieve regeneration gas heating air separation process requires molecular sieve adsorber to adsorb impurities in the air to prevent moisture and carbon dioxide in the air from freezing and depositing in the heat exchanger or distillation tower, blocking passages, pipelines and valves, while absorbing Hydrocarbons prevent their accumulation in liquid oxygen and create an explosion hazard. When two molecular sieves work alternately on the table, the other uses high temperature gas for regeneration. Therefore, the electric heater is designed to warm the regeneration gas in the process, so that the regeneration gas reaches the temperature required by the process. The regeneration gas flow rate is large, the gas temperature is high, the electric heater power is high, and the energy consumption is serious.
In summary, a heat exchanger is installed in front of the air cooling tower to increase the temperature of the molecular sieve regeneration gas by enriching a large amount of heat energy in the compressed air, thereby reducing the power of the molecular sieve electric heater while reducing the temperature of the raw material air. To achieve energy conservation and consumption reduction, and to develop a circular economy.
2 Feasibility analysis 1) Take 10 oxygen generator as an example, the parameters of air compressor outlet and molecular sieve regeneration gas are shown in Table 1. Table 1 Air compressor outlet and molecular sieve regeneration gas parameters Ten air compressor air compressor sewage nitrogen pollution Nitrogen Influent Nitrogen Temperature Electric Addition Molecular Sieve Molecular Sieve Molecular Sieve Cooler Oxygen Pressure Flow Temperature Warming Pressure Heating Flow Cold Blowing Pressure Blowing Flow Power Design Value Actual 0.49 Value 2) Gas Heat Transfer Schematic See Raw Gas for Full Heat Exchange, Utilization The residual heat of the air compressor heats the temperature of the molecular sieve regeneration gas, and reduces the power of the molecular sieve electric heater while reducing the gas temperature of the air compressor, thereby achieving the purpose of energy saving and consumption reduction.
3 Heat exchanger selection and pipeline design The fins of common plate-fin heat exchangers are available in straight, sawtooth and porous forms. Straight fins are suitable for heat transfer between high temperature fluids and low temperature fluids. Big situation. Sawtooth fins are mostly used in switching heat exchangers with low temperature difference between high and low temperature fluids. Porous fins are often used as baffles and in applications where the fluid has a phase change. Combined with the above situation, the straight-type high-efficiency plate-fin heat exchanger can better meet the needs of the waste heat utilization of the air compressor. The investment is small and the benefits are good.
4 Conclusion After the project is put into operation, the energy consumption can be greatly reduced and the economic benefits can be improved while ensuring the normal operation of the equipment. While reducing the oxygen consumption of oxygen production, it can also greatly reduce the amount of circulating water, which is of great significance for the development of circular economy.
| A STARTER (ALSO SELF-STARTER, SELF, CRANKING MOTOR, OR STARTER MOTOR) IS A DEVICE USED TO ROTATE (CRANK) AN INTERNAL-COMBUSTION ENGINE SO AS TO INITIATE THE ENGINE'S OPERATION UNDER ITS OWN POWER. STARTERS CAN BE ELECTRIC, PNEUMATIC, OR HYDRAULIC. IN THE CASE OF VERY LARGE ENGINES, THE STARTER CAN EVEN BE ANOTHER INTERNAL-COMBUSTION ENGINE. |
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