Selective non-catalytic reduction (SNCR) denitration multi-nozzle long-gun injector

Abstract

The invention relates to a selective non-catalytic reduction (SNCR) denitration multi-nozzle long-gun injector, which comprises a gun body assembly and at least two nozzles, wherein the gun body assembly comprises a pipeline assembly, an input assembly and a gun head; the pipeline assembly comprises a cooling water input pipe, a urea pipe, an air pipe and a cooling water output pipe from the interior to the exterior in turn; the input assembly comprises a water inlet joint, a urea joint, an air joint and a water outlet joint; the gun head comprises a urea seal head, an air seal head which is arranged at an outlet end of the air pipe, and a cooling water seal head which is arranged between an inlet end and a cooling water outlet end of the cooling water output pipe; each nozzle is an internal-mixing nozzle arranged on the gun assembly; a mixing chamber of each nozzle is communicated with a urea cavity and an air cavity respectively; and an opening of each nozzle is formed on a side wall of the cooling water output pipe. The technical problem that the conventional SNCR denitration multi-nozzle long-gun injector is low in denitration efficiency and unstable in performance in a high-temperature high-corrosion and high-abrasion flue gas environment is solved, and the injector is reasonable in design, stable in operation and high in denitration efficiency.

Description

technical field [0001] The invention relates to a flue gas wet denitrification device for a power station boiler, in particular to an SNCR (selective non-catalytic reduction method) denitrification multi-nozzle lance injector, which can be applied to a power station coal-fired boiler for NOx control treatment. Background technique [0002] When the boiler burns pulverized coal for energy conversion, it will emit a large amount of pollutants to the environment. According to statistics, 67% of atmospheric NOx emissions come from coal combustion. Therefore, it is very necessary to control NOx for coal-fired boilers in power plants. SNCR denitrification technology began to be applied in Japan in the mid-1970s. In the late 1980s, EU countries also began to apply SNCR denitrification technology. The United States began to apply SNCR denitrification technology in the early 1990s. The installed capacity has exceeded 2GW, and the installed capacity in China is relatively small. In r...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems of the existing SNCR denitrification multi-nozzle long lance injector with low denitrification efficiency and unstable performance in the flue gas environment of high temperature, high corrosion and high wear, the present invention provides an SNCR denitrification multi-nozzle long lance injector with a structure Reasonable design, stable operation, high denitrification efficiency

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