Desulfurization, denitration and dust removal integrated process

Abstract

The invention relates to a desulfurization, denitrification and dust removal integrated process. According to the process, flue gas is fed into a desulfurization, denitrification and dust removal integrated tower by an induced draft fan, the flue gas moves from bottom to top, spraying liquid moves from top to bottom, an electroactive substance is selected as a catalytic reaction medium when a gas-liquid phase of the flue gas passes through an electrocatalytic reaction layer, under the effect of an electric field, an electro-catalytic reaction is carried out on the surface area of the electroactive substance, ammonia or urea in the circulating liquid is absorbed as a reducing agent to enable NOx to generate N2, meanwhile, desulfurization is carried out, then the flue gas passes through a liquid film washing layer to achieve the dust removal effect, and the purified flue gas is sent to a chimney for up-to-standard emission. The desulfurization, denitrification and dust removal integrated process has the following beneficial effects: (1) desulfurization, denitrification and dust removal cooperate with each other, and the problem of flue gas treatment is solved with high efficiency and low cost; (2) a high-consumption and high-pollution process is changed into a production process with product value; (3) denitration is not limited by temperature; (4) the problems of entrainment, soluble salt taking-out and ammonia escape in wet desulphurization are solved; and (5) the occupied area is small, and the investment cost is low.

Description

technical field [0001] The invention belongs to the field of boiler tail gas treatment. The invention relates to an integrated process of desulfurization, denitrification and dust removal, which is used to remove SO in flue gas 2 , NOx and dust, more specifically, the desulfurization, denitrification and dust removal are completed in a main absorption tower equipment, which occupies a small area, has a small investment in equipment, and has good effects. net emission standards. Background technique [0002] At present, the most widely used desulfurization technology is the wet lime-gypsum method, which has the following problems: 1) The desulfurization pipeline is easily blocked; 2) The utilization rate of absorbent raw materials is low; 3) Calcium sulfite is difficult to oxidize, and the power consumption of the oxidation fan is large; 4) The by-product calcium sulfate is viscous, difficult to filter, and has a high water content; 5) The quality of the by-product calcium ...

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Problems solved by technology

[0002] At present, the most widely used desulfurization technology is the wet lime-gypsum method, which has the following problems: 1) The desulfurization pipeline is easily blocked; 2) The utilization rate of absorbent raw materials is low; 3) Calcium sulfite is difficult to oxidize, and the power consumption of the oxidation fan is large; 4) The by-product calcium sulfate is viscous, difficult to filter, and has a high water content; 5) The quality of the by-product calcium sulfate is low;

[0003] At present, the most widely used denitrification technology at home and abroad is medium-high temperature SCR denitrification. The application characteristic of this method is that it needs a suitable temperature zone. , there is no temperature zone required for medium and high temperature SCR denitration. This method has three major problems in the treatment of flue gas in these industries: 1) heating is required, which consumes huge energy; 2) heat exchange and other facilities need to be installed, which prolongs the process and expands the capacity Investment; 3) Catalyst consumption is large and loss is large

[0004] For the dust removal ultra-low emission transformation, the "wet electricity" process is generally used, and there are three major problems: 1) The effect of wet electricity is greatly affected by the desulfurization system, and the demisting function itself is gradually reduced; 2) The addition of wet electricity dust removal requires high investment and low operation High cost; 3) Wet electricity requires a high-voltage electric field, and the risk of combustion and explosion is high

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