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Low-temperature SCR (selective catalytic reduction) fixed bed fume denitration device for horizontal waste heat boiler

A waste heat boiler and fixed bed technology, applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., to achieve the effects of small overall layout impact, low reaction temperature, and low renovation costs

Inactive Publication Date: 2012-09-12
NORTH CHINA POWER ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no flue gas denitrification device designed for low temperature denitrification reaction

Method used

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  • Low-temperature SCR (selective catalytic reduction) fixed bed fume denitration device for horizontal waste heat boiler
  • Low-temperature SCR (selective catalytic reduction) fixed bed fume denitration device for horizontal waste heat boiler
  • Low-temperature SCR (selective catalytic reduction) fixed bed fume denitration device for horizontal waste heat boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] See Figure 1A , 1B As shown in , it is a structural schematic diagram of a low-temperature SCR fixed-bed flue gas denitrification device modified from an existing horizontal waste heat boiler.

[0033] The device comprises a waste heat boiler 1, the waste heat boiler 1 is connected to a chimney 8, and a connecting flue 6 is arranged on the outside of the chimney 8, and the chimney 8 has an upper inlet 81 and a lower outlet 82, and the connecting flue 6 is connected to the upper inlet 81 and the lower outlet 82. It is connected through; it is also provided with an ammonia / air mixer 2, an ammonia injection mixing device 4 and a low-temperature SCR reactor 5. The ammonia injection mixing device 4 generally includes an ammonia injection grid and a static mixing grid or a vortex mixer. The air mixer 2 is located outside the connecting flue 6, the ammonia injection mixing device 4 and the low-temperature SCR reactor 5 are located inside the connecting flue 6; the ammonia / air...

Embodiment example 2

[0038] See Figure 2A , 2B As shown in , it is a structural schematic diagram of a low-temperature SCR fixed-bed flue gas denitrification device modified from an existing horizontal waste heat boiler.

[0039] The device comprises a waste heat boiler 1, the waste heat boiler 1 is connected to a chimney 8, and a connecting flue 6 is arranged on the outside of the chimney 8, and the chimney 8 has an upper inlet 81 and a lower outlet 82, and the connecting flue 6 is connected to the upper inlet 81 and the lower outlet 82. Connected through; also provided with ammonia / air mixer 2, injection-ammonia mixing device 4 and low-temperature SCR reactor 5, the ammonia / air mixer 2 is located outside the connecting flue 6, the ammonia injection mixing device 4 and low-temperature SCR The reactor 5 is arranged inside the connecting flue 6; the ammonia / air mixer 2 is connected to the ammonia injection mixing device 4, and the ammonia injection mixing device 4 is arranged below the low-temper...

Embodiment example 3

[0043] See Figure 3A , 3B As shown in , it is a structural schematic diagram of a low-temperature SCR fixed-bed flue gas denitrification device modified from an existing horizontal waste heat boiler.

[0044] The device comprises a waste heat boiler 1, the waste heat boiler 1 is connected to a chimney 8, and a connecting flue 6 is arranged on the outside of the chimney 8, and the chimney 8 has an upper inlet 81 and a lower outlet 82, and the connecting flue 6 is connected to the upper inlet 81 and the lower outlet 82. Connected through; also provided with ammonia / air mixer 2, ammonia injection mixing device 4 and low-temperature SCR reactor 5, the ammonia / air mixer 2 is located outside the connecting flue 6, the ammonia injection mixing device 4 and low-temperature SCR reaction The device 5 is arranged inside the connecting flue 6; the ammonia / air mixer 2 is connected to the ammonia injection mixing device 4, and the ammonia injection mixing device 4 is arranged below the lo...

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Abstract

The invention relates to a low-temperature SCR (selective catalytic reduction) fixed bed fume denitration device for a horizontal waste heat boiler, which comprises a waste heat boiler and a chimney connected with the waste heat boiler. The invention is structurally characterized in that the outer side of the chimney is provided with a connection flue, an ammonia / air mixer, an ammonia spray mixing device and a low-temperature SCR reactor, wherein the chimney is provided with a lower outlet and an upper inlet, and the connection flue is connected and communicated with the lower outlet and the upper inlet; the ammonia / air mixer is arranged outside the connection flue; the ammonia spray mixing device and the low-temperature SCR reactor are arranged in the connection flue; the ammonia / air mixer is connected with the ammonia spray mixing device; the ammonia spray mixing device is arranged below the low-temperature SCR reactor; a baffle is arranged between the lower outlet and the upper inlet of the chimney; and the low-temperature SCR reactor comprises a denitration reaction space in which a low-temperature catalyst is arranged. The invention is also structurally characterized in that the ammonia spray mixing device and the low-temperature SCR reactor are arranged between the waste heat boiler and the chimney. The low-temperature SCR fixed bed fume denitration device for a horizontal waste heat boiler is obtained according to the two structures.

Description

technical field [0001] The invention belongs to the field of boiler flue gas denitrification, in particular to a low-temperature SCR fixed-bed flue gas denitrification device for a horizontal waste heat boiler. Background technique [0002] GB 13223-2011 "Emission Standards of Air Pollutants for Thermal Power Plants", which was officially implemented on January 1, 2012, adjusted the emission concentration limits of air pollutants; stipulated the time limit for existing thermal power boilers to reach more stringent emission concentration limits ; The emission concentration limit of air pollutants from gas-fired boilers was added; the special emission limit of air pollutants was added. The implementation of the new standard puts forward stricter requirements for all enterprises with emissions. [0003] At present, the measures to control flue gas nitrogen oxide emissions can be mainly divided into three categories. The first category is low-nitrogen oxide combustion technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
Inventor 徐清李新春孙永斌
Owner NORTH CHINA POWER ENG
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