Method and system for combined treatment of boiler smoke and alkaline waste water and waste heat utilization

Abstract

The invention discloses a method and system for combined treatment of boiler smoke and alkaline waste water and waste heat utilization. The method belongs to a waste water and exhaust gas processing method. Firstly, alkaline waste water is sent into an alkali liquor pool so as to evenly stir water quality and water amount; then, the obtained mixture is sent into an integral desulfuration dust collector; the waste water discharged from the desulfuration dust collector is sent to a water-water heat exchanger or is directly sent to an effluent pool after being detected by a temperature sensor; meanwhile, boiler smoke is sent to the integral desulfuration dust collector for desulfuration and dust collection after being subjected to waste heat recovery. Different from the traditional smoke desulfuration and dust collection method, the method provided by the invention has the advantages that an aeration mode is adopted to cause the smoke and the waste water to intensively contact, thereby overcoming the problems of big capital construction investment and high operation cost or low desulfuration efficiency of the traditional method; meanwhile, smoke desulfuration, dust collection, smoke waste heat recovery and waste water waste heat recovery are cooperatively controlled; and low-grade waste heat is effectively recovered while the high-efficiency desulfuration and dust collection effect is guaranteed.

Description

technical field [0001] The invention provides a method and system for combined treatment of boiler flue gas and alkaline waste water and utilization of waste heat, in particular to a joint treatment of coal-fired boiler flue gas with high sulfur content and alkaline industrial waste water, realizing waste treatment The waste method realizes the recovery and utilization of waste heat while treating waste. Background technique [0002] The flue gas produced by coal-fired boilers and oil-fired boilers contains a large amount of SO 2 . At present, the wet method is usually used to desulfurize the flue gas, and 90% of the wet method is the lime / limestone-gypsum wet method, and the desulfurization efficiency is relatively high. However, there has been no breakthrough in this technology in my country. The system is mainly imported from Japan, and 70% of small and medium-sized boiler companies (1 ton to 35 tons) in China cannot afford the massive infrastructure investment and high...

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Problems solved by technology

[0004] The purpose of the present invention is to design a boiler flue gas desulfurization and dust removal method with small capital investment, low operating cost and high desulfurization efficiency in view of the problems of large capital investment, high operating cost or low desulfurization efficiency of the existing desulfurization and dust removal process, so as to realize Effectively recycle waste heat from waste water and flue gas while treating waste

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