Integrated desulfuration and dust removal method for medium and small boiler flue gas

Abstract

The invention discloses an integrated desulfuration and dust removal method for medium and small boiler flue gas, which comprises that: after the boiler flue gas is subjected to dust removal through an electric dust remover, the boiler flue gas is tangentially fed into a desulfuration tower under the traction of a draft fan to perform desulfuration reaction, the desulfurized and water mist removed flue gas can be directly fed into a flue and discharged by a chimney; and a mode of circular absorption in the tower is adopted for the desulfuration solution, kettle solution of the desulfuration tower flows into a circulation tank through a pipeline, the solution is first added into a crystallization tank, crystal seeds are added to induce the crystallization of gypsum, the crystallized circulation solution is fed into a regeneration tank for regeneration, the regenerated desulfuration solution is added into a sedimentation tank for sedimentation, and the supernate and the desulfuration solution fed into the crystallization tank are pumped into the desulfuration tower in a certain ratio through a circulating pump and serve as desulfuration solution for the desulfuration reaction.

Description

technical field [0001] The invention relates to a flue gas integrated desulfurization and dust removal method for medium and small boilers. Background technique [0002] The flue gas desulfurization of small and medium-sized coal-fired boilers is an environmental governance project faced by many enterprises. [0003] At present, there are more than 500,000 industrial boilers in my country, 80% of which are small and medium boilers (1t / h ~ 35t / h). According to statistics, among the dust removal equipment installed in these boilers, wet dust removal devices (water film and rinsing, etc.) account for about 25% to 35%. [0004] Due to the shortage of water in northern my country and abundant water sources in the south, the proportion of wet dust removal devices installed in the south is greater than that in the north. These wet dust collectors consume a lot of tap water every year. Taking a 10t / h boiler as an example, the annual consumption of tap water (including water for du...

AI Technical Summary

Problems solved by technology

[0020] The technical problem to be solved in the present invention is to overcome the defects of the prior art and provide an integrated desulfurization and dust removal method for small and medium-sized boiler flue gas. Before the regeneration reaction, a crystallization pool is added, crystal seeds are added to induce gypsum crystallization, and supersaturation is avoided. The solution enters the absorption system to prevent scaling and blockage caused by gypsum added to the desulfurization tower for crystallization