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Novel SCR denitration system based on ammonia escape catalytic removal

A technology of ammonia escape and ammonia gas removal, applied in the field of new SCR denitrification system, can solve the problems of large resistance loss, blockage of adsorption and desorption bed, inability to adapt to the operating conditions of power plants, etc., achieve small changes, low cost, and reduce overall operation Cost and Effect of Overhaul

Inactive Publication Date: 2016-12-07
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the activated carbon fiber adsorption material works in the high-dust flue gas, not only the resistance loss along the process is very large, but also the adsorption-desorption bed will soon be blocked by the dust, which cannot adapt to the actual operating conditions of the power plant.

Method used

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  • Novel SCR denitration system based on ammonia escape catalytic removal
  • Novel SCR denitration system based on ammonia escape catalytic removal
  • Novel SCR denitration system based on ammonia escape catalytic removal

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The new SCR denitrification system and process flow used in Example 1 are as described above and will not be repeated. Among them, this embodiment is an overall transformation of the denitration system of a 600MW unit in a coal-fired power plant. On the basis of the original three layers of SCR denitration catalyst layer 8, an additional layer of ammonia gas removal catalyst layer 9 is installed. The ammonia gas removal catalyst layer 9 specifically adopts an ammonia gas decomposition catalyst, the main active component of the ammonia gas decomposition catalyst is a Ru-based compound, and the specification shape of the ammonia gas decomposition catalyst is honeycomb. In order to verify the actual working performance of the new SCR denitrification system based on ammonia slip catalytic removal after modification, the NO in the flue gas x Under the 100% rated load with the maximum concentration and ammonia injection volume, the denitrification performance test of the new ...

Embodiment 2

[0047] The new SCR denitrification system and process flow used in Example 2 are the same as those in Example 1, and will not be repeated. Example 2 is an overall transformation of the denitrification system of a 350MW unit in a coal-fired power plant. On the basis of the original three layers of SCR denitration catalyst layer 8, an additional layer of ammonia gas removal catalyst layer 9 is installed. The ammonia gas removal catalyst layer 9 is specifically an ammonia oxidation catalyst, the main active component of which is a modified compound of noble metal Pt, and the specification shape of the ammonia oxidation catalyst is honeycomb.

[0048] In order to verify the actual working performance of the new SCR denitrification system based on ammonia slip catalytic removal after modification, the NO in the flue gas x Under the 100% rated load with the maximum concentration and ammonia injection volume, the denitrification performance test of the new SCR denitrification system ...

Embodiment 3

[0053] The new SCR denitrification system and process flow used in Example 3 are the same as those in Example 2, and will not be repeated. Example 3 is an overall transformation of the denitrification system of a 660MW unit in a coal-fired power plant. On the basis of the original three layers of SCR denitration catalyst layer 8, an additional layer of ammonia gas removal catalyst layer 9 is installed. The ammonia gas removal catalyst layer 9 is specifically an ammonia oxidation catalyst, the main active component of which is a modified compound of noble metal Pt, and the specification shape of the ammonia oxidation catalyst is honeycomb.

[0054] In order to verify the actual working performance of the new SCR denitrification system based on ammonia slip catalytic removal after modification, the NO in the flue gas xThe test was carried out under the condition that the concentration and the amount of ammonia injection changed the most. The load of the unit was reduced from 100...

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Abstract

The invention discloses a novel SCR denitration system based on ammonia escape catalytic removal. The novel SCR denitration system comprises an SCR denitration reactor, a denitration system inlet flue arranged on the top of the SCR denitration reactor, and a denitration system outlet flue arranged on the bottom of the SCR denitration reactor, wherein the denitration system inlet flue is connected with an economizer outlet flue of a boiler system, and the denitration system outlet flue is connected with an inlet of the air pre-heater of the boiler system; the denitration system inlet flue comprises a horizontal flue body and a vertical flue body, an ash bucket is arranged on the bottom of the vertical flue body, and an ammonia spraying grating is arranged in the vertical flue body; guide vanes, a rectification grating, an SCR denitration catalyst layer and an ammonia removal catalyst layer are arranged in the SCR denitration reactor from top to bottom in sequence, and the SCR denitration catalyst layer and the ammonia removal catalyst layer are provided with soot blower systems. By the adoption of the novel SCR denitration system, construction is easy, cost is low, ammonia removal rate can reach 90-99%, and ammonia escape concentration at an outlet of the denitration system can be controlled to be below 3 ppm.

Description

technical field [0001] The invention belongs to the technical field of controlling air pollutants discharged from coal-fired boilers, and in particular relates to a novel SCR denitrification system based on ammonia escape catalytic decomposition. Background technique [0002] Coal-fired power generation is still the most important source of electric energy in my country at this stage, but coal will emit a large amount of pollutant gases during the combustion process, such as SO 2 , NO x Wait. of which NO x It is also the main factor causing severe weather such as photochemical smog, PM2.5 and acid rain. In order to reduce NO x The emission of pollutants, each coal-fired power plant is equipped with denitrification devices, among which the Selective Catalytic Reduction (SCR) denitrification process has begun to be widely used due to its high denitrification efficiency, mature technology, and simple operation and maintenance. It is used in the flue gas treatment of advanc...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56B01D53/58
CPCB01D53/8631B01D53/8634B01D53/90B01D2255/202B01D2255/20723B01D2255/20753B01D2255/20776
Inventor 董锐锋王锋涛张小霓吴文龙
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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