Semi-dry process smoke eliminator with independent temperature-reducing column

Abstract

The invention relates to a smoke gas purification device by a semidry process, which is provided with an independent desuperheating tower, comprising a reaction tower provided with an smoke inlet box, a smoke gas outlet, a venturi tube type tower wall arranged on a tower bottom, a water injector arranged on the tower wall and a nozzle for lime dry powder and revert dust; and the smoke gas outlet is connected with an inertia separator, an activated carbon mixer, a bag-type dust remover and a draught fan. The invention is characterized in that the invention is also provided with the desuperheating tower which is provided with a boiler smoke gas inlet manifold, a single-stage water injector, an ash bucket with an ash hole and a gas flue; the gas flue of the desuperheating tower is connected with the smoke inlet box into one unit. The boiler smoke gas disperses within the two towers for cooling, thereby improving the adaptability of a system to a load; the boiler smoke gas particularly can be cooled down urgently to a set temperature in the desuperheating tower; and the reaction tower can be humidified only by evaporation with a little water to complete a deacidifying reaction and remove dioxin, thereby avoiding the disadvantages of scale formation on the tower wall of the prior reaction tower and bag burning of the bag-type dust remover, guaranteeing a sustaining and stable smoke purification process and having the advantages of good purification effect and low energy consumption.

Description

technical field [0001] The invention relates to a semi-dry flue gas purification device, in particular to a device capable of effectively preventing fouling on the inner wall of its reaction tower and pasting bags of a bag dust collector, thereby ensuring continuous and stable flue gas purification process, good purification effect and low energy consumption A semi-dry flue gas purification device with an independent desuperheating tower. technical background [0002] At present, the flue gas purification device used for domestic waste incineration is a semi-dry flue gas purification device including a reaction tower for flue gas deacidification and a bag filter for dust removal. For example, the application number in the Chinese patent is 200610052126.9 "Flue Gas Purification Device of Domestic Waste Incinerator", which includes a reaction tower with a flue gas inlet pipe, a slag outlet, a nozzle for dry lime powder and returned ash, and a flue gas outlet, and a set of reac...

AI Technical Summary

Problems solved by technology

The existing flue gas purification device sprays desuperheating water and lime dry powder or slurry into the reaction tower at the same time, removes HCL, SOx, and HF through neutralization reaction, and then removes heavy metals and dioxins by reducing the temperature and adsorbing activated carbon. A better flue gas purification effect is achieved; but it also has the following problems in use: 1) The current waste incineration boiler can only use a higher exhaust gas temperature in order to prevent corrosion of the heating surface at the tail of the waste heat boiler, resulting in The temperature of the flue gas purification device is very high; however, it has been confirmed from relevant theories and experiments that whether it is the neutralization and deacidification reaction of the flue gas or the removal of dioxins and heavy metals in the flue gas, their effects are all with the flue gas Decrease with increasing temperature

Therefore, for the neutralization and deacidification reaction tower in the existing flue gas purification device, a large amount of desuperheating water must be added for cooling; etc., and with the rotation of the airflow, it is thrown to the tower wall, and the fly ash bridges or sticks into scale on the inner wall of the reaction tower; the result not only affects the quality of flue gas purification, but also increases the resistance of flue gas movement, so that the flue gas The energy consumption of gas purification increases; 2) A large amount of desuperheating water entering the reaction tower also increases the humidity of the flue gas coming out of the reaction tower, resulting in further increase in the resistance of the subsequent bag filter and flue gas purification. The purification process cannot continue due to the severe bagging of the bag filter

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