Needle-shaped rotary-type SCR (Selective Catalytic Reduction) dynamic mixing and anti-ash-deposition nozzle device
A technology of dynamic mixing and nozzle devices, which is applied in injection devices, gas treatment, membrane technology, etc., can solve problems such as nozzle dust accumulation, uneven distribution, and denitrification efficiency cannot be guaranteed, so as to prevent nozzle mouth dust accumulation and prevent Ammonia escape is too high, safe and stable and the effect of operation
Pending Publication Date: 2018-08-17
DATANG ENVIRONMENT IND GRP
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Problems solved by technology
At present, the SCR system is affected by the transformation space of the power plant. Generally, there are many variable cross-sections and diverting flues. The flow field and ash field in front of the ammonia injection grid often have poor uniformity, resulting in low-velocity ammonia (NH 3 ) The nozzles are seriously fouled, making the NH downstream of the ammonia injection grid 3 / NO x uneven distribution
in NH 3 / NO x Where it is too high, the escape rate of ammonia will increase, and in severe cases, it may cause blockage of the air preheater or subsequent equipment
in NH 3 / NO x Where it is too low, the denitrification efficiency cannot be guaranteed
Method used
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[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0025] A needle-shaped rotary SCR dynamic mixing and anti-fouling nozzle device, such as Figure 1-5 As shown, the nozzle device is arranged at the ammonia injection grill 7, including: a nozzle 3, a coupling 2, a moving blade device 1, a pine needle dust remover 4, an ammonia injection main pipe 5 and a spring 6;
[0026] Nozzle 3, a plurality of nozzles 3 are evenly arranged on the ammonia injection mother pipe 5 placed horizontally, and are vertically fixedly connected with the ammonia injection mother pipe 5; the nozzles 3 are all cylindrical and are arranged vertically upward;
[002...
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The invention relates to the technical field of gas mixing and anti-ash-deposition and in particular to a needle-shaped rotary-type SCR (Selective Catalytic Reduction) dynamic mixing and anti-ash-deposition nozzle device. The needle-shaped rotary-type SCR dynamic mixing and anti-ash-deposition nozzle device is positioned at an ammonia spraying grid, and comprises multiple nozzles which are uniformly installed on a horizontally placed ammonia spraying mother tube, and vertically connected with the ammonia spraying mother tube. The nozzles are of cylinder-shaped. A coupling is positioned at a center line of the nozzle cylinder. A moveable blade device is positioned at a top end position of the coupling. The moveable blade device is provided with multiple moveable blades. The top end of a spring is fixed on the bottom end of the coupling, the bottom end of the spring is fixed on the ammonia spraying mother tube through a controllable nut. A needle-shaped ash remover is installed on the part, positioned in the nozzles, of the coupling. The needle-shaped rotary-type SCR dynamic mixing and anti-ash-deposition nozzle device is capable of preventing the excessive high local ammonia escaperate of a catalyst outlet or the excessive low denitration efficiency, preventing the ash deposition of a nozzle opening, and enabling an SCR system to safely, stably and efficiently operate.
Description
technical field [0001] The invention relates to the technical field of gas mixing and fouling prevention, in particular to a needle-shaped rotary SCR dynamic mixing and fouling prevention nozzle device. Background technique [0002] Selective Catalytic Reduction (SCR) is currently the most widely used and most mature flue gas denitrification method in China. SCR uses ammonia (NH 3 ) As a reducing agent, ammonia gas with a volume concentration of 5% is injected into the flue gas with a temperature of 300 ° C ~ 420 ° C through an injection device. Under the action of a catalyst, ammonia (NH 3 ) converts the nitrogen monoxide (NO) and nitrogen dioxide (NO) in the flue gas 2 ) is reduced to pollution-free nitrogen (N 2 ) and water (H 2 O). [0003] Ammonia (NH 3 ) injection device is one of the important components of SCR system, mostly composed of ammonia injection grid and static mixer. At present, the SCR system is affected by the transformation space of the power plan...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B01D53/90B01D53/56B05B15/50
CPCB01D53/8631B01D53/90B05B15/50B01D2258/0283B01D2251/2062
Inventor 包文运
Owner DATANG ENVIRONMENT IND GRP