In-situ regeneration method of ammonium sulfate poisoning denitration catalyst

A denitration catalyst, in-situ regeneration technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve problems such as limited application, poisoning and deactivation of ammonium sulfate, and achieve short regeneration time. , The effect of low regeneration cost and saving regeneration cost

Inactive Publication Date: 2016-06-22
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to ammonium sulfate poisoning and deactivation of the catalyst during low temperature operation (≤300°C), the application of SCR technology in industrial flue gas denitrification is limited, such as coke oven flue gas, catalytic cracking regeneration gas, etc.

Method used

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  • In-situ regeneration method of ammonium sulfate poisoning denitration catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the SCR main reactor, the fresh catalyst is at normal pressure, the temperature is 200°C, SO 2 The concentration is 2000mg / m 3 , NO concentration is 800mg / m 3 , the ammonia nitrogen ratio is 1.0, and the space velocity is 5000h -1 The denitrification efficiency of the catalyst dropped from 90.5% to 50% after running for 1000 hours under the flue gas condition.

[0031] Process flow of the present invention such as figure 1 As shown, when the concentration of nitrogen oxides in the flue gas is close to the emission limit, the flue gas is switched to the SCR standby reactor, and the hot air is passed into the SCR main reactor, wherein the space velocity of the air is 1000h -1 , the temperature is 350° C.; after the hot air is purged for 4 hours, the feeding is stopped, and the regeneration of the denitration catalyst of the present invention is completed.

[0032] The flue gas was switched back to the SCR main reactor, and the concentration of nitrogen oxides at th...

Embodiment 2

[0034] In the SCR main reactor, the fresh catalyst is at normal pressure, the temperature is 200°C, SO 2 The concentration is 2000mg / m 3 , NO concentration is 800mg / m 3 , the ammonia nitrogen ratio is 1.0, and the space velocity is 5000h -1 The denitrification efficiency of the catalyst dropped from 90.5% to 50% after running for 1000 hours under the flue gas condition.

[0035] Process flow of the present invention such as figure 1 As shown, when the concentration of nitrogen oxides in the flue gas is close to the emission limit, the flue gas is switched to the SCR standby reactor, and the hot air is passed into the SCR main reactor, wherein the space velocity of the air is 2000h -1 , the temperature is 400° C.; after the hot air is purged for 2.0 hours, the feeding is stopped, and the regeneration of the denitration catalyst of the present invention is completed.

[0036] The flue gas was switched back to the SCR main reactor, and the concentration of nitrogen oxides at ...

Embodiment 3

[0038] In the SCR main reactor, the fresh catalyst is at normal pressure, the temperature is 200°C, SO 2 The concentration is 2000mg / m 3 , NO concentration is 800mg / m 3 , the ammonia nitrogen ratio is 1.0, and the space velocity is 5000h -1 The denitrification efficiency of the catalyst dropped from 90.5% to 50% after running for 1000 hours under the flue gas condition.

[0039] Process flow of the present invention such as figure 1 As shown, when the concentration of nitrogen oxides in the flue gas is close to the emission limit, the flue gas is switched to the SCR standby reactor, and the hot nitrogen is passed into the SCR main reactor, wherein the space velocity of nitrogen is 1000h -1 , the temperature is 350° C.; after the hot nitrogen is purged for 4.0 h, the feeding is stopped, and the regeneration of the denitration catalyst of the present invention is completed.

[0040] The flue gas is switched back to the SCR main reactor, and the concentration of nitrogen oxid...

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Abstract

The invention relates to an in-situ regeneration method of an ammonium sulfate poisoning denitration catalyst and belongs to the technical field of an industrial denitration catalyst. The in-situ regeneration method comprises the following steps: (1) when the concentration of nitrogen oxide in outlet flue gas of an SCR (Semiconductor Control Rectifier) main reactor is close to an emission limit value, switching the flue gas to an SCR reserved reactor; (2) introducing hot gas flow into the SCR main reactor and decomposing an ammonium sulfate layer deposited on the surface of the catalyst under the action of the hot gas flow; continuously introducing the hot gas flow for 1 hour to 8 hours to finish regeneration of the denitration catalyst; (3) switching the flue gas back to the SCR main reactor and continually carrying out a denitration reaction. Under the action of the hot gas flow, ammonium sulfate is decomposed into ammonia gas, sulfur trioxide and water steam and is removed along the flowing of the hot gas flow, so that the denitration performance of the catalyst can be recovered. The in-situ regeneration method of the ammonium sulfate poisoning denitration catalyst has the advantages of simplicity in operation, short regeneration time, low regeneration cost, safety and environmental friendliness, high denitration efficiency of the regenerated catalyst, and no changes of the strength and pore structure of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of industrial denitrification catalysts, in particular to an in-situ regeneration method for ammonium sulfate poisoned denitrification catalysts. Background technique [0002] In recent years, my country's NOx emissions have risen rapidly. Without proper control, nitrogen oxide emissions will reach 30 million tons in 2020, posing a huge threat to my country's atmospheric environment. In view of the adverse effects of nitrogen oxides on the atmospheric environment and the severe situation of nitrogen oxide emission control, the Ministry of Environmental Protection has issued new nitrogen oxide emission standards for power plants, boilers, coking, cement, glass, steel, petroleum refining and other industries. The successive implementation of new standards has greatly stimulated the denitrification industry, including related equipment manufacturing, catalyst manufacturing and recycling of spent catalysts. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92B01J23/30B01D53/96
CPCB01J23/002B01D53/96B01D2255/20707B01D2255/20723B01D2255/20776B01D2255/40B01J23/30B01J23/92B01J2523/00B01J2523/47B01J2523/55B01J2523/69
Inventor 李敬张新波胡洧冰王磊张向辉王蕾何洋
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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