System and method for improving uniformity of selective catalytic reduction (SCR) flow field

A technology of uniformity and flow field, which is applied in the system field of improving the uniformity of SCR flow field, can solve the problems of uneven flow field in the flue, and the inability to adjust the flow field in the flue, so as to reduce the area of ​​flue gas flow, reduce blockage, Effect of reducing flue gas velocity

Active Publication Date: 2017-09-26
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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Problems solved by technology

However, due to the complexity of flue gas turbulent flow in the flue and the limitations of numerical simulation and cold-state physical model test, after the installation of the SCR system, there will also be uneven flow fields in the flue when the coal type and load are changed. At this time, because all internal structures have been fixed and installed, it is no longer possible to adjust the flow field in the flue

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  • System and method for improving uniformity of selective catalytic reduction (SCR) flow field
  • System and method for improving uniformity of selective catalytic reduction (SCR) flow field
  • System and method for improving uniformity of selective catalytic reduction (SCR) flow field

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Embodiment Construction

[0038] Attached below figure 1 , attached figure 2 , attached image 3 The present invention will be further described.

[0039]A system for improving the uniformity of the SCR flow field, comprising: a flue 1, which has a π-shaped structure, the lower end of the front of the flue 1 is the first corner 2, the upper end of the front is the second corner 3, and the upper end of the rear is the third corner 4. The lower end behind it is the fourth corner 5; a number of arc-shaped primary deflectors 6 are evenly spaced along the diagonal direction of the first corner 2; several arc-shaped secondary deflectors 8, It is arranged at even intervals along the diagonal direction of the second corner 3; the ammonia injection grill 7 is arranged between the first corner 2 and the second corner 3; N three-stage deflectors 9 are arranged along the third corner 4 The diagonal direction of each is uniformly spaced, N is a natural number greater than or equal to 3 and less than or equal to...

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Abstract

The invention relates to a system and a method for improving the uniformity of a selective catalytic reduction (SCR) flow field. The system comprises a flue, a plurality of circular arc-shaped primary guide plates, a plurality of circular arc-shaped secondary guide plates, an ammonia injection grid, N tertiary guide plates, a plurality of catalyst layers, and M sets of differential pressure measurement components which are horizontally arranged along the width direction of the flue and are positioned between the catalyst layers and the tertiary guide plates, wherein each set of differential pressure measurement component is evenly provided with N differential pressure detection devices arranged at intervals along the depth direction of the flue. The system and the method can improve the flue gas flow field in front of the catalyst layers, guarantees the speed uniformity of an SCR system, and effectively reduces the phenomenon that the catalyst layers are blocked or worn.

Description

technical field [0001] The invention relates to the field of an SCR denitrification system for a coal-fired boiler, in particular to a system and a method for improving the uniformity of an SCR flow field. Background technique [0002] Most of the SCR denitrification systems of coal-fired boilers in my country were installed after the release of GB 13223-2011 "Emission Standards of Air Pollutants for Thermal Power Plants". Since the installation space was not considered in the early stage of unit design, this led to the installation of SCR out-of-stock systems. The layout of the flue is very irregular, the internal flue gas flow field is seriously uneven, and the local catalyst layer is severely worn and collapsed, which eventually leads to a decrease in the efficiency of the denitration system and an increase in the ammonia escape rate, which poses a more serious safety threat to downstream equipment. [0003] At this stage, the main method to solve the uneven flow field of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56G05B19/05
CPCB01D53/8631B01D53/90B01D2258/0283G05B19/054
Inventor 张利孟董信光车刚侯凡军刘科崔福兴
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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