Gas mixture ratio control apparatus and method implementing low-nitrogen combustion by oxygen-deficient CO2-rich gas

Abstract

The invention provides a gas mixture ratio control apparatus and method implementing low-nitrogen combustion by oxygen-deficient CO2-rich gas. The apparatus comprises an air preheater, a mixed gas tank, a blower, a boiler flue gas reflow pipe, a fresh air pipe and a blower air pipe; one end of a flue gas incoming chamber of the air preheater is communicated with a flue gas outlet of a boiler and communicated with the mixed gas tank through the boiler flue gas reflow pipe; a fresh air outlet of the fresh air preheater is communicated with the mixed gas tank through the fresh air pipe; the mixed gas tank is communicated with an air inlet of the blower; the blower is communicated with a primary air chamber inlet of the boiler. The blower extracts boiler flue gas and fresh air through the boiler flue gas reflow pipe and the fresh air pipe, respectively; the boiler flue gas and the fresh air are mixed well in the mixed gas tank; mixed gas is blown into the boiler by the blower; various gases engage in oxidation-reduction reactions in a hearth of the boiler; thus, oxygen nitride is eliminated or largely decreased.

Description

technical field [0001] The application of the present invention relates to a device and method for controlling the gas mixing ratio of oxygen-deficient and carbon dioxide-enriched gas to realize low-nitrogen combustion, and relates to the technical transformation of small and medium-sized industrial layer-fired boilers, which can realize energy saving and reduce the generation of nitrogen oxides during boiler combustion amount, so as to achieve the purpose of energy saving, emission reduction and environmental improvement. Background technique [0002] The three combustion methods of fuel in the boiler are stratified combustion, boiling combustion and suspension combustion. Layered combustion is to place the fuel on a fixed or moving grate to form a uniform material layer with a certain thickness. The air enters from the bottom of the grate to carry out combustion reaction through the fuel layer. The boiler using layered combustion is called layer burner. According to the ...

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Problems solved by technology

[0003] Existing boiler combustion, the boiler flue gas is discharged outside without reflux treatment, which makes the nitrogen oxide concentration and temperature of the discharged boiler flue gas higher, resulting in excessive exhaust emission and thermal pollution; the blast temperature of the boiler blower is normal temperature gas, The waste heat of flue gas exhausted outside the boiler can not be effectively utilized, wasting precious fuel

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