A built-in sncr spray gun

Abstract

The invention provides a built-in SNCR spray gun. The built-in SNCR spray gun has the advantages of light weight, unlimited length, simple structure and capability of avoiding deformation of spray gun. The built-in SNCR spray gun comprises a SNCR spray gun main body, an evaporative cooling medium outlet, an evaporative cooling medium inlet, a plurality of pipe clamps and an evaporative cooling medium, wherein the SNCR spray gun main body is inserted into a boiler body from a boiler wall; the evaporative cooling medium outlet and the evaporative cooling medium inlet are communicated with the SNCR spray gun main body; the pipe clamps are sleeved on the SNCR spray gun main body at intervals; the evaporative cooling medium is circulated between the evaporative cooling medium outlet and the evaporative cooling medium inlet and has a boiling point at below 100 DEG C; the external sides of the pipe clamps are fixed on the corresponding heated walls in the boiler; the evaporative cooling medium entering into the evaporative cooling medium inlet is in liquid phase form; the evaporative cooling medium flowing out of the evaporative cooling medium outlet is in vapor phase; and the spray gun is fixed on the heated wall in the boiler through the pipe clamps, so that the limitation on the spray gun length is avoided, the gaps are arranged between the pipe clamps and the spray gun and the heated free expansion of the spray gun can be realized.

Description

technical field [0001] The invention relates to a spray gun in SNCR, in particular to a built-in SNCR spray gun. Background technique [0002] SNCR denitrification process is a kind of working fluid (-NH 2 Reducing agent), a denitrification method that reduces NOx in the furnace. At present, the SNCR spray gun is less than 8 meters long and adopts a retractable design. When put into operation, the spray gun is inserted into the furnace through the pre-opened hole of the boiler furnace wall by the actuator. The spray gun is pulled out by the actuator when it is out of service. Since the temperature in the boiler furnace is about 1000°C, the spray gun needs to be cooled. The current cooling method is to use process water as the cooling medium, as follows figure 1 shown. In the prior art, for large-scale coal-fired units, the width of the boiler reaches more than 30 meters. The current structure of the spray gun is difficult to meet the requirements. The structural desig...

AI Technical Summary

Problems solved by technology

In the prior art, for large-scale coal-fired units, the width of the boiler reaches more than 30 meters. The current structure of the spray gun is difficult to meet the requirements. The structural design also greatly increases the volume of the boiler itself, which is difficult to meet the process requirements

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