Method and system for recycling waste heat of ammonia water

Abstract

The invention provides a method and a system for recycling waste heat of ammonia water. The method comprises the following steps: circulating circulatory ammonia water into a gas collecting pipe of a coke oven, cooling raw gas for the first time, heating the circulatory ammonia water, feeding the heated circulatory ammonia water into a heat exchange device, and heating the circulating water in the heat exchange device; circulating the circulating water heated in the heat exchange device into a lithium-bromide absorption-type refrigerating machine as a heat source to refrigerate frozen water in the lithium-bromide absorption-type refrigerating machine; meanwhile, circulating a refrigerant into the lithium-bromide absorption-type refrigerating machine; and feeding the cooled circulating water to the heat exchange device and heating again. According to the method provided by the invention, the waste heat in the circulatory ammonia water is effectively recycled and is used for refrigeration, the waste heat recovery rate of the circulatory ammonia water is improved, and the waste of the energy is effectively avoided.

Description

technical field [0001] The invention relates to the field of coking, in particular to a method and system for recycling waste heat of ammonia water. Background technique [0002] Coking enterprises are important energy production departments. Coking is a process in which coking coal is heated to about 1000°C under air-isolated conditions, and coke, coke oven gas and coking chemical products are produced through high-temperature dry distillation. Among the coking products, red-hot coke and raw coal gas are both in a high-temperature state and contain a large amount of heat energy. Therefore, it is necessary to feed raw coal gas into the coke oven gas collection pipe, and the coke oven gas collection pipe is set in the ammonia water circulation loop. The ammonia water is sent into the coke oven gas collection pipe through the ammonia water circulation pump, and then passes through the coke oven Constantly spray ammonia water to cool down the raw gas, and then transfer a large...

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Problems solved by technology

[0004] First of all, the recovered recycled ammonia waste heat is used for heating, which is only useful in winter, while coking enterprises usually produce throughout the year, so the recycling rate of recycled ammonia waste heat is low

[0005] Secondly, heating equipment needs to allocate heating circulating water pipelines to each user, and coking enterprises are mostly far away from living areas. In this way, the pipeline laying distance is long and the investment is too large, which is not practical for most coking enterprises

[0006] Finally, due to the certain corrosiveness of circulating ammonia water, if the circulating ammonia water leaks into the heating circulating water due to corrosion or other reasons, it will cause harm to the health of heating users, and its reliability is not high

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