Wastewater treatment zero-emission method of household garbage incineration power plant

Abstract

The invention discloses a wastewater treatment zero emission method for a household garbage incineration power plant. The wastewater treatment zero emission of the household garbage incineration power plant is realized. Heat energy of high-temperature flue gas generated by waste incineration and purified by flue gas purification equipment is fully utilized, the heat energy passes through a gas-water indirect type heat exchanger, precipitated wastewater generated in a gas-water direct contact type heat exchanger is heated to about 60 DEG C, then the heated wastewater is introduced into a negative-pressure flash tank, and the waste water is discharged from the negative-pressure flash tank. Water in the wastewater is separated out in the form of water vapor, then the wastewater is introduced into a condensation tank with the same negative pressure for condensation, condensate water is conveyed to a condensation water tank through a booster pump, and finally the condensate water is input into a whole plant water system for utilization; after the concentrated liquid in the flash tank is neutralized by simply adding alkaline substances, the concentrated liquid is pumped into the incinerator through the booster pump to be incinerated, so that harmless treatment is realized, and zero emission of pollutants is achieved.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a wastewater treatment method in waste heat utilization of waste incineration boiler flue gas. Background technique [0002] The flue gas discharged from the boiler that incinerates domestic waste needs to be treated by a series of flue gas purification systems. The flue gas after treatment has the characteristics of high temperature and high humidity, and the volume fraction of water vapor in the exhaust flue gas can reach 15%-40%. , the final exhaust gas temperature is also as high as 140°C-150°C. The existing method of directly discharging the treated flue gas has the problems of high exhaust temperature, serious smoke white fog, and serious waste of secondary energy; in addition , due to the difference in the quality of incineration waste, after the domestic waste incineration boiler passes through the flue gas treatment system, most of the sensible heat and latent heat of vap...

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Problems solved by technology

[0002] The flue gas discharged from the boiler that incinerates domestic waste needs to be treated by a series of flue gas purification systems. The flue gas after treatment has the characteristics of high temperature and high humidity, and the volume fraction of water vapor in the exhaust flue gas can reach 15%-40%. , the final exhaust gas temperature is also as high as 140°C-150°C. The existing method of directly discharging the treated flue gas has the problems of high exhaust temperature, serious smoke white fog, and serious waste of secondary energy; in addition , due to the difference in the quality of incineration waste, after the domestic waste incineration boiler passes through the flue gas treatment system, most of the sensible heat and latent heat of vaporization contained in the flue gas are wasted with the flue gas discharge; The cascade deep recycling of waste heat is a technical problem that needs to be solved on site; waste water will be generated in the recovery and utilization of flue gas waste heat, how to deal with this waste water, so that the waste-to-energy plant can achieve zero discharge of waste water treatment, has become a problem that needs to be solved on site Another question

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