Composite desulfurization tower for ultra-low emission of coal-fired power plant

Abstract

The invention relates to a composite desulfurization tower for the ultra-low emission of a coal-fired power plant, and the tower comprises a tower body; the tower body internally comprises an oxidation crystallization section, a coarse desulfurization and dust removal section, a fine desulfurization and dust removal section and a horizontal demisting section from bottom to top, and also comprises a tower top flushing layer in the tower body and a reuse water system outside the tower body; the tower top washing layer is arranged between the fine desulfurization and dust removal section and the horizontal demisting section; the reuse water system comprises a clarifier, a flocculant box and a reuse water tank, an inlet of the clarifier is connected with a branch pipe of an outlet pipe of the liquid holding layer circulating pump, a clear liquid outlet of the clarifier is connected with an inlet of the reuse water tank, a bottom outlet of the clarifier is connected with a desulfurizing tower slurry pool, an outlet of the reuse water tank is connected with the tower top flushing layer, and an outlet of the flocculant box is connected with the inlet of the clarifier. The water balance problem is solved by additionally arranging the water recycling system on the basis of the liquid holding layer device, so the tower wall and the tower cap are fully flushed, the liquid holding layer thin slurry operation is realized, and the problems of deposition, blockage and dust are solved.

Description

technical field [0001] The invention belongs to the technical field of flue gas ultra-ultra-low emission treatment, and in particular relates to a composite desulfurization tower used for ultra-ultra-low emission in coal-fired power plants. Background technique [0002] Coal-fired power generation is the "cleanest" way to utilize coal resources, and it is undoubtedly the most correct choice to concentrate the use of coal on thermal coal. The application of ultra-low emission technology in coal-fired power plants has achieved remarkable results. The emission concentration of gas pollutants in power plants after ultra-low emission transformation has basically reached the emission limit of gas turbine units, and the smoke and dust ≤ 10mg / Nm 3 , SO 2 ≤35mg / Nm 3 , NO x ≤50mg / Nm 3 , which greatly enhanced the public's confidence in the clean utilization of coal. [0003] According to the current technological development, the International Energy Agency has formulated a coal-...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a composite desulfurization tower for ultra-ultra-low emissions in coal-fired power plants in view of the above-mentioned deficiencies in the prior art, and solve the water balance by adding a recycling water system on the basis of the liquid-holding layer device problems, so that the tower wall and tower cap can be fully flushed, and the liquid-holding layer slurry operation can be realized, and the problems of sedimentation clogging and dust can be solved at the same time

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