Composite flue gas denitrification oxidizing agent and application method of composite flue gas denitrification oxidizing agent

An oxidant and denitrification technology, applied in the field of flue gas denitrification agent, can solve the problem of oxidant to be further developed, and achieve the effects of low equipment investment and maintenance costs, high denitration efficiency and mild conditions

Active Publication Date: 2018-01-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many different types of oxidants have been applied in flue gas wet denitrification technology, cheap and efficient oxidants still need to be further developed

Method used

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  • Composite flue gas denitrification oxidizing agent and application method of composite flue gas denitrification oxidizing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Potassium persulfate complex (2KHSO 5 ·KHSO 4 ·K 2 SO 4 ), trichloroisocyanuric acid and sodium hypochlorite mixed solution to oxidize NO and Na 2 CO 3 Alkaline solution absorption denitrification

[0018] The flue gas containing NOx after pre-dust removal and desulfurization treatment is sent from the bottom of the oxidation absorption tower by a fan, and 0.5wt% potassium hydrogen persulfate compound (2KHSO 5 ·KHSO 4 ·K 2 SO 4 ), 1wt% trichloroisocyanuric acid and 3wt% sodium hypochlorite solution to oxidize NO. The oxidized flue gas is sent to the bottom of the alkaline absorption tower through the fan, and the 2 CO 3 Alkaline solution absorption. Contains NO x The residence time of the gas in the oxidation absorption tower and the alkaline absorption tower is 8s and 10s respectively, the operating temperature of the oxidation absorption tower is 60°C and the liquid-gas ratio is 10L / m 3 , the liquid-gas ratio of the alkaline absorption tower...

Embodiment 2

[0019] Embodiment 2: trichloroisocyanuric acid and sodium hypochlorite mixed solution oxidation NO and Na 2 CO 3 Alkaline solution absorption denitrification

[0020] The NOx-containing flue gas that has been pre-dusted and desulfurized is sent from the bottom of the oxidation absorption tower by a fan, and the NO is oxidized by using 1wt% trichloroisocyanuric acid and 10wt% sodium hypochlorite solution. The oxidized flue gas is sent to the bottom of the alkaline absorption tower through the blower fan, and the 15wt% Na 2 CO 3 Alkaline solution absorption. Contains NO x The residence time of the gas in the oxidation absorption tower and alkaline absorption tower is 10s and 15s respectively, the operating temperature of the oxidation absorption tower is 50°C and the liquid-gas ratio is 10L / m 3 , the liquid-gas ratio of the alkaline absorption tower is 20L / m 3 . The final denitrification efficiency can reach 96%.

Embodiment 3

[0021] Embodiment 3: Potassium persulfate complex (2KHSO 5 ·KHSO 4 ·K 2 SO 4 ) and trichloroisocyanuric acid mixed solution to oxidize NO and Na 2 CO 3 Alkaline solution absorption denitrification

[0022] Will be pre-dusted and desulfurized to contain NO x The flue gas is sent from the bottom of the oxidation absorption tower by the fan, and 2wt% potassium hydrogen persulfate compound (2KHSO 5 ·KHSO 4 ·K 2 SO 4 ) and 1wt% trichloroisocyanuric acid solution to oxidize NO. The oxidized flue gas is sent to the bottom of the alkaline absorption tower through the blower fan, and the 20wt% Na 2 CO 3 Alkaline solution absorption. Contains NO x The residence time of the gas in the oxidation absorption tower and the alkaline absorption tower is 5s and 10s respectively, and the operating temperature of the oxidation absorption tower is 45°C and the liquid-gas ratio is 5L / m 3 , the liquid-gas ratio of the alkaline absorption tower is 15L / m 3 . The final denitrification e...

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Abstract

The invention belongs to the technical field of flue gas denitrification agents, and particularly relates to a composite flue gas denitrification oxidizing agent and application method of the composite flue gas denitrification oxidizing agent. The composite flue gas denitrification oxidizing agent comprises a mixed aqueous solution of two or more than two of potassium hydrogen persulfate (2KHSO5.KHSO4.K2SO4), trichloroisocyanuric acid and sodium hypochlorite. The composite denitrification oxidizing agent is used to denitrate the flue gas, the NO in the flue gas is in contact with the compositedenitrification oxidizing agent in an absorption tower and is oxidized into NO2, then the generated NO2 is absorbed through an alkaline solution in another absorption tower, nitrate and nitrite are generated, and the purpose of denitrification is reached. The denitrification efficiency of the used denitrification mixed solution is high, the removal rate of the NO is up to more than 90%, the investment cost of equipment is low, and the operation is simple.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification agents, and in particular relates to a composite flue gas denitrification oxidant and an application method thereof. Background technique [0002] my country is a large coal consumption country, and the coal combustion process produces a large amount of pollutants every year, among which NO X It is one of the air pollutants that need to be controlled. NO X It will lead to the formation of acid rain and photochemical smog, which is extremely harmful to the ecological environment and human production and life. Therefore, the control and purification of nitrogen oxides produced in the process of coal combustion are very important. [0003] At present, the common flue gas denitrification technologies in China include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). Both of these denitrification methods use ammonia or urea as the reducing agent to r...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/56B01D53/75
Inventor 杜中田李幸霏孙小万肖楚红
Owner DALIAN UNIV OF TECH
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