Flue gas desulfurization technology with effect of ultra-clean emission

Abstract

The invention discloses an ultra-clean emission technology for removing ammonia sulfate chemical fertilizer as an SO2 byproduct in flue gas, and belongs to a desulfurization and denitrification technology for air contaminant treatment in the field of environmental protection. According to the technology, ammonia is taken as a desulfurizing agent, high-temperature flue gas is cooled to 50-70 DEG Cthrough a concentration section of an absorption tower and then enters an absorption section of the absorption tower, an absorption liquid in the absorption section is subjected to a reaction with SO2in the flue gas to finish the desulfurization process, the absorption liquid obtained after the reaction flows to an absorption circulating tank automatically, the absorption liquid in the absorptioncirculating tank is subjected to a reaction with ammonia, ammonium sulfite is generated, part of ammonium sulfite is taken as the absorption liquid to return to the absorption section, part of ammonium sulfite is oxidized into ammonium sulfate, an ammonium sulfate solution is sent to the concentration section to exchange heat with the flue gas, ammonium sulfate crystals are separated out, a suspension containing the ammonium sulfate crystals is subjected to swirling flow treatment and filtered, solids are dried to be a finished product, and a liquid returns to the concentration section; the desulfurized flue gas passes through a folded plate type demister and then enters a desulfurized flue gas deep purification section at the upper part of the absorption tower for treatment, and accordingly, the flue gas meets the ultra-clean emission standard.

Description

Technical field: [0001] The invention relates to air pollution control desulfurization and denitrification technology in the field of environmental protection, in particular to a flue gas desulfurization process with ultra-clean emission. Background technique: [0002] Existing similar technology and existing deficiency are as follows: [0003] The current wet ammonia desulfurization ultra-clean emission technologies mainly include ammonia desulfurization + wet electric demister method, ammonia desulfurization + tube bundle demister method, ammonia desulfurization + multi-stage water washing method. [0004] 1. Ammonia desulfurization + wet electrostatic demister method [0005] Ammonia water is used as the desulfurization agent, and the ammonia and ammonium sulfite solution and the SO 2 Reaction to remove SO 2 , to generate ammonium sulfate and ammonium sulfite as by-products, and use air aeration at the bottom of the desulfurization tower to oxidize ammonium sulfite int...

AI Technical Summary

Problems solved by technology

[0019] Aiming at the problems existing in the prior art, the present invention proposes a flue gas desulfurization process with ultra-clean emissions to solve the problems of high energy consumption, large investment, and the inability of clean flue gas to achieve ultra-low emissions in the prior art. The design is reasonable, the energy consumption is low, and the net flue gas reaches the ultra-clean emission standard

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