Harmless treatment system and method for waste incineration flue gas

Abstract

The invention discloses a harmless treatment system and method for waste incineration flue gas. The harmless treatment system comprises a dust removal mechanism and a purification mechanism, and the interior of the dust removal mechanism communicates with the interior of the purification mechanism through a gas guide pipe. According to the harmless treatment system for the waste incineration flue gas, impurities on the surfaces of a coarse filter screen and a fine filter screen are cleaned through a cleaning brush, so that the problem that meshes in the coarse filter screen and the fine filter screen are blocked by the impurities can be effectively avoided, and the filtering effect of the filtering assembly on solid particle impurities in the flue gas is ensured, and the treatment effect on dust and solid particle impurities in the flue gas is improved. Sulfides in the flue gas is purified through flue gas purification treatment liquid in a purification box, sodium alkali serves as a desulfurizing agent, lime serves as a regenerant, and calcium sulfite and sodium alkali and calcium sulfite precipitates are generated by adding lime into a circulating water system; the calcium sulfite is precipitated, the sodium alkali is recycled along with the desulfurization circulating water, so that the problem of easy scaling of a lime method is effectively solved, and meanwhile, the advantage of high desulfurization efficiency of a sodium alkali method is achieved.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a system and method for the harmless treatment of waste incineration flue gas. Background technique [0002] Waste incineration technology is a high-temperature pyrolysis treatment technology, which can simultaneously realize the reduction, recycling and harmless treatment of waste. The characteristics of incineration treatment are rapid and thorough waste treatment, large capacity reduction, effective control of secondary pollution, high energy conversion rate, and good comprehensive utilization. It is a waste treatment method commonly used in developed countries. However, waste incineration will produce secondary pollution, and each ton of waste incineration will produce about 4000-5000Nm 3 The exhaust gas, the acidic pollutants in the exhaust gas are mainly HCl and SO 2 , its content can reach 1200mg / Nm 3 and 600mg / Nm 3 about. Therefore, in order to prevent sec...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a system and method for harmless treatment of waste incineration flue gas. By cleaning the impurities on the surface of the coarse filter and the fine filter with the cleaning brush, it is possible to effectively prevent impurities from affecting the coarse filter. The problem of blockage caused by the mesh holes on the fine filter net ensures the filtering effect of the filter component on the solid particle impurities in the flue gas, improves the treatment effect on the dust and solid particle impurities in the flue gas, and solves the current harmless treatment of flue gas The system has the problems of high cost, large floor space, and complicated operating procedures. In addition, after a period of treatment of dust pollutants contained in the flue gas, the dust removal parts in the bag filter are easily blocked by dust accumulation.

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