Front-end atomizing automatic-stretching spray gun of SNCR (Selective Non-Catalytic Reduction) system

Abstract

The invention discloses a front-end atomizing automatic-stretching spray gun of an SNCR (Selective Non-Catalytic Reduction) system. The front-end atomizing automatic-stretching spray gun comprises a spray pipe, a nozzle, an adjustment lead screw, a cylinder assembly, a pneumatic assembly, a compressed air source assembly and a base, wherein the cylinder assembly, the pneumatic assembly and the compressed air source assembly are connected, the cylinder assembly comprises a rodless cylinder; the spray pipe is fixed to a slipway of the rodless cylinder through the adjustment lead screw; and the movement of the slipway is controlled, so that the action that the spray pipe is put in a furnace chamber or stretches from the furnace chamber is realized. The front-end atomizing automatic-stretching spray gun of the SNCR system has the following beneficial effects that compressed air is used for replacing a centrifugal fan as an atomizing air source, and the structure of the spray gun is matched, so that the atomizing effect of a urea solution is increased, the spraying uniformity is improved, the spraying distance is enlarged, the denitration effect of the SNCR system is effectively guaranteed and improved, normal operation of a garbage incineration plant is guaranteed, and the disorderly closedown rate is reduced; the service life of the spray gun is prolonged; and the occurrence frequency of blocking of the nozzle is reduced.

Description

technical field [0001] The invention is applicable to the flue gas treatment in the garbage incineration industry - the selective non-catalytic reduction method denitrification system, which is used to atomize the denitrification agent into a specified particle size and evenly spray it into the flue cross section, specifically a front end of an SNCR system Atomizing automatic retractable spray gun. Background technique [0002] The concentrated incineration method has gradually become the main way of domestic waste treatment in my country. A certain amount of nitrogen oxides——NOx (NO, NO 2 , N 2 O, N 2 o 3 , N 2 o 4 , N 2 o 5 Nitrogen oxides, etc.), with the enhancement of national awareness of environmental protection, with the full implementation of the "Pollution Control Standards for Domestic Waste Incineration" (GB18485-2014) since January 1, 2016, the waste incinerator flue gas emissions The NOx concentration limit has been raised to 250mg / m 3 Next, new requir...

AI Technical Summary

Problems solved by technology

In actual use, the main problems are: 1) The atomizing air pressure is low, the solution blowing distance is relatively short, and it is difficult for the solution to cover the entire flue section

2) The urea solution mainly relies on the single-fluid nozzle structure to achieve atomization and spray angle distribution. The nozzle structure is complex and is easily blocked by the accumulation of impurities in the flue gas

3) The atomization effect of the solution is poor, resulting in a large deviation of the distribution of urea molecules in the cross section of the flue

4) Long-term exposure of spray gun tube and nozzle to high temperature and corrosive flue gas environment is easy to cause thermal deformation and short service life

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