Method for realizing denitration in solid-gas conversion furnace and use equipment of method

Abstract

The invention discloses a method and equipment for realizing denitration in a solid-gas conversion furnace, belonging to the technical field of the boiler flue gas denitration. The method comprises the following steps: converting a solid-state denitration substance such as urea into a gas-state substance by virtue of a heating gasifying system; and spraying the gas-state denitration substance intoan in-furnace denitration region in a boiler to adequately mix the gas-state substance with to-be-treated flue gas for reaction. The urea is further heated to be gasified through heat of the boiler,and a temperature adjusting protection part connected with a second draught fan is utilized for adjusting the heating temperature in a gasifying region and protecting pipelines distributed in the boiler, so that the pipelines are not damaged and deformed due to the high temperature in the boiler; and the flue gas lower than 850 DEG C is denitrated in the boiler, so that compared with the prior art, the efficiency is remarkably improved, the denitration cost is lowered, and the environmental protection is promoted.

Description

technical field [0001] The invention relates to a method for denitrification in a solid-gas reformer, in particular to a method and equipment for denitrification in a solid-gas reformer, and belongs to the technical field of boiler flue gas denitrification. Background technique [0002] At present, with the development of the global economy, the environmental pollution caused by massive energy consumption cannot be underestimated. Among them, atmospheric smoke, acid rain, greenhouse effect and the destruction of the ozone layer have become the four major killers that endanger the harmonious coexistence of human beings and the biological world. [0003] my country is a large developing country with coal as one of the main energy sources. Harmful substances such as soot, sulfur dioxide, and nitrogen oxides contained in coal-burning flue gas have caused serious air pollution. In my country, harmful substances such as sulfur dioxide and nitrogen oxides are mainly produced by co...

AI Technical Summary

Problems solved by technology

[0005] The denitration reaction temperature of SCR technology is generally 280 ℃ ~ 400 ℃, and the denitration efficiency is over 90%. There are also some problems in SCR technology: first, the system occupies a large area, and the equipment investment and operating costs are relatively high

Third, ammonia leakage and the resulting accumulation of ammonium sulfate will lead to a decrease in the performance of the air preheater

Fourth, the core component of SCR - the catalyst is particularly prone to poisoning, which seriously affects the normal use of the denitrification system and increases operating costs

[0006] The reaction temperature of SNCR technology is generally between 850°C and 1100°C, and the denitrification efficiency is medium, generally around 30%-80%. The disadvantage of SNCR technology is that it is greatly affected by the size of the boiler structure. As a supplementary treatment method for low-nitrogen combustion technology, SNCR has high requirements for flue gas temperature, and temperature fluctuations will directly affect the denitrification effect of the system

[0007] At present, SCR and SNCR are the two most widely used technologies, but these two technologies cannot meet the new national environmental protection requirements.

The combined technology of SCR+SNCR increases the project investment cost

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