Selective catalytic reduction (SCR) denitration ammonia injection grid
An ammonia injection grid and denitrification technology, which is applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of uneven ammonia injection, shortage and blockage, and achieve the effect of uniform ammonia injection.
Active Publication Date: 2015-04-29
大连贝斯特环境工程设备有限公司
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Problems solved by technology
Improper design of ammonia injection grid or uneven distribution of flue gas flow will easily cause uneven mixing and reaction of NOx and NH3, which not only affects denitrification efficiency and economy, but also easily causes excessive ammonia injection locally
The traditional ammonia injection grid device has the disadvantages of wear and blockage, especially uneven ammonia injection, excessive or insufficient local ammonia injection, etc., which limits its popularization and application
Method used
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[0012] Modular design of 310 material is adopted. Each group of upper and lower gas collecting and distributing pipes 3 is equipped with two ammonia spraying short pipes 1 and two ammonia spraying long pipes 2. N nozzles 4 are set according to the smooth simulation. The nozzle branch pipe 6 on the short ammonia pipe 1 and the long ammonia injection pipe 2 is arranged obliquely at 90°, facing away from the flue gas flow direction, and a strip-shaped ash baffle 5 is arranged on the back to prevent the clogging and wear of the nozzle 4 by ash; The nozzle branch pipe 6 is provided with a hole cap 7, and the hole cap 7 is equipped with a flow regulating orifice 8 to adjust the ammonia flow rate and prevent insufficient or excessive ammonia spraying. The combination of short ammonia injection pipe 1 and long ammonia injection pipe 2 is used to reduce the static pressure characteristics of the header and ensure uniform ammonia injection in the depth direction of the flue; the nozzle 4...
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The invention provides a selective catalytic reduction (SCR) denitration ammonia injection grid. The SCR denitration ammonia injection grid comprises gas collecting and distributing pipes, wherein each gas collecting and distributing pipe is connected with multiple groups of ammonia injection pipes, each ammonia injection pipe is connected with a plurality of nozzle branch pipes, and each nozzle branch pipe is connected with a nozzle. The SCR denitration ammonia injection grid is characterized in that the multiple groups of ammonia injection pipes consist of multiple groups of ammonia injection short pipes and multiple groups of ammonia injection long pipes, the ammonia injection short pipes and the ammonia injection long pipes are mutually alternatively and uniformly distributed in a flue, each nozzle is back to the flow direction of smoke, a hole cap and a flow adjusting pore plate are mounted on each nozzle, and a strip-shaped ash blocking plate is arranged on the back of each nozzle. The SCR denitration ammonia injection grid has the advantages of uniformity in ammonia injection, blocking prevention and abrasion resistance.
Description
technical field [0001] The invention belongs to the technical field of selective catalytic reduction (SCR) denitrification, and relates to an SCR denitrification ammonia injection grid device, which is suitable for mixing ammonia and flue gas in SCR denitrification projects of industrial enterprise boilers and kilns, and for other gases The injection device and so on. Background technique [0002] In the flue gas denitration device, the diffusion of ammonia and the uniformity of mixing with the flue gas are one of the key factors affecting the denitrification efficiency. At present, the SCR denitrification process has various forms and structures according to the injection device ammonia injection grid (AIG). Ammonia Injection Grid (AIG) is usually designed by dividing the flue section into several control areas, and each control area has several injection holes. The ammonia injection grill includes ammonia injection pipes, supports, fittings and ammonia gas distribution d...
Claims
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Inventor 曲芳
Owner 大连贝斯特环境工程设备有限公司