排汽余热利用的理论可行性（The theoretical feasibility of exhaust gas waste heat utilization）.docVIP

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排汽余热利用的理论可行性（The theoretical feasibility of exhaust gas waste heat utilization）.doc

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排汽余热利用的理论可行性（The theoretical feasibility of exhaust gas waste heat utilization）

排汽余热利用的理论可行性（The theoretical feasibility of exhaust gas waste heat utilization） 1. Theoretical feasibility of exhaust gas waste heat utilization Thermal power plant power generation are the root cause of low efficiency is taken away by circulating water heat loss is as high as 50.5% ~ 61.5%, and the partial loss of supercooling released steam heat of vaporization, its temperature is well below the boiling point of water, water is lost as heat transfer medium meaning. Therefore, to use this part of the waste heat power generation, it must choose a new heat transfer medium, which is a liquid at room temperature, slightly higher than normal temperature can vaporize the new medium, the use of steam turbine exhaust waste heat power generation theory problem solved. Choice of media The medium that satisfies the above conditions is ammonia. The objectifying property of ammonia is as follows: (1) it is easy to dissolve in water at normal temperature. A volume of water dissolves 700 volumes of ammonia. Produce a hydrated ammonia: NH3 · H2O. The bonds are hydrogen bonds, which are very unstable, and they are decomposed into ammonia and water. The NH3 · H2O (2) under normal pressure ammonia liquid temperature is 35.35 ℃; When pressurized to 0.7 ~ 0.8mpa, it will also liquefy at normal temperature. (3) ammonia gasification takes a lot of heat, but when ammonia and water break down, the amount of heat absorbed is not much, under 41.86 kJ · mol - 1. (4) after ammonia dissolves into water, the liquid is formed and the heat of vaporization is released in the form of chemical energy, so it is not necessary to take the medium of ammonia boiling point as a cold reservoir to take away the heat of vaporization. (5) ammonia is not corrosive to metal and is used as a refrigerant. But if there is water, it is very corrosive to copper. Therefore, the heat exchanger should not be made of copper and its alloy. (6) from ammonia I - s figure reflects the fact that when the pressure is 1.6 MPa a