Wet process smoke washing wastewater main flue evaporation method

Abstract

The invention discloses a wet-process smoke washing wastewater main flue evaporation method. The method comprises the following steps: collecting smoke washing wastewater into a smoke washing wastewater tank; adjusting the pH value of the smoke washing wastewater in the smoke washing wastewater tank; feeding the smoke washing wastewater with the adjusted pH value into a bag filter for filtering; conveying the filtered smoke washing wastewater from the bag filter to a wastewater filtering pipeline; whether the cooling spray gun system breaks down or not is judged, if yes, the smoke washing waste water is conveyed to an atomizer system, and the atomizer system sprays the smoke washing waste water into the semi-dry reaction tower; otherwise, conveying the smoke washing wastewater to a cooling spray gun system, and spraying the smoke washing wastewater into the semi-dry reaction tower by the cooling spray gun system; the smoke washing wastewater is used for deacidifying and cooling the smoke in the spraying process in the semi-dry reaction tower, and is consumed due to high-temperature evaporation. According to the method, the smoke washing performance of the reaction tower is optimized through the method that the smoke washing wastewater is sprayed back to the atomizer system or the cooling spray gun system, the good cooling and smoke washing effect can be achieved, and meanwhile the smoke washing wastewater can be consumed through high-temperature evaporation of the reaction tower.

Description

technical field [0001] The invention belongs to the field of waste water treatment of smoke, and in particular relates to a method for evaporating a main flue of waste water from wet washing smoke. Background technique [0002] The composition of the smoke washing wastewater generated during the flue gas purification process of waste incineration is very complex, mainly including toxic and harmful pollutants such as ammonia nitrogen, HCl, HF, SOx, various heavy metals, suspended solids, and residual organic matter, and the water volume is relatively large. Thorough treatment will have a serious impact on the surrounding environment. At present, there are two main treatment methods for the smoke washing wastewater produced by domestic waste incineration power plants: 1. Internal consumption, such as water for fly ash solidification mixing, slag cooling water and pulping water. Its disadvantages are: the content of chlorine ion in tobacco washing wastewater is high, about 20,...

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Problems solved by technology

Its disadvantages are: the content of chlorine ion in tobacco washing wastewater is high, about 20,000 mg / L. Since the content of chloride ion is positively correlated with the concentration of heavy metal leaching, if it is used for mixing water for fly ash solidification, it will cause the leach toxicity test of fly ash solidified block to fail to meet the standard. , cannot enter the landfill for sanitary landfill; if it is used for slag cooling water, the chloride ions in the smoke washing wastewater will corrode the slag discharge system and affect the operation stability of the slag discharge system; due to the presence of a large amount of heavy metal ions in the smoke wash wastewater, if used For pulping water, after adding lime, the pH will reach strong alkalinity, which will cause heavy metal precipitation to block the lime slurry conveying system and atomizer system, affecting the smoke cleaning efficiency of the semi-dry system, and at the same time affecting the atomizer body and atomizing plate Also has a strong corrosion effect, increasing maintenance costs

Its disadvantages: the waste water treatment system designed according to the chemical coagulation and sedimentation method has a high treatment cost, about 32 yuan / ton, and has certain requirements on the parameters such as conductivity and pH value of the waste water from washing, which cannot be processed if it exceeds the range. Abnormal operating conditions will directly affect the inability to purify the smoke washing wastewater. Therefore, it has become a research direction to provide low-cost, high-efficiency, and able to reduce the corrosion of the smoke washing wastewater treatment equipment.

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