Ultralow-emission nitrogen oxide biomass chain boiler

Abstract

The invention provides an ultralow-emission nitrogen oxide biomass chain boiler. The ultralow-emission nitrogen oxide biomass chain boiler comprises a boiler body, a chain grate and a spiral feeder, wherein an upper header, a lower header, an upper boiler barrel and a lower boiler barrel are arranged in the boiler body; a hearth, a flue gas radiation chamber, a flue gas convection box and a smoke exhaust box are arranged in the boiler body; an air preheater is arranged in the smoke exhaust box; the chain grate is arranged at the bottom of the hearth; primary air is supplied from the air chamber of the chain grate; in particular, hearth front and back air jet pipes are arranged on front and back arch throats respectively, and are connected with front and back air jet pipe fans; secondary air is supplied in two segments from front and back arches. Furthermore, the primary air can be supplied in two segments from the air chamber of the chain grate; the air source of the primary air and / or the secondary air can be hot air output by the air preheater; 1-3 afterburning ports are formed beside a feeding hole in the front arch throat; a denitrification combustion device is correspondingly arranged on each afterburning port. By adopting the ultralow-emission nitrogen oxide biomass chain boiler, zero emission of carbon dioxide is basically realized, and the effect of low emission of dust, nitrogen oxide and sulfur dioxide is achieved.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to chain boilers using biomass as fuel. Background technique [0002] Biomass boilers have the function of providing steam and hot water heat sources for industrial production, and have natural advantages over boilers burning coal, gas, and oil fuels in terms of pollutant emissions: zero emissions of carbon dioxide (plant growth and combustion emit equal carbon dioxide ), ultra-low sulfur dioxide (zero) emissions. With the improvement of energy saving and emission reduction requirements in our country, large-scale factories and enterprises have increased the demand for biomass boilers, and also put forward new requirements for the thermal efficiency and exhaust gas emission of biomass boilers. However, there is still a big technical problem in the existing biomass boilers, the nitrogen oxide emission is usually 300mg / m 3 ~600mg / m 3 , NOx X From the perspective of pollution, it i...

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Problems solved by technology

It can be seen that the emission of nitrogen oxides will cause serious harm to the environment

Therefore, the country has specified relevant standards for boiler emissions, referring to GB13271-2014 "Emission Standards of Air Pollutants for Boilers", requiring nitrogen oxide emissions to be within 150 mg / m 3 ~400mg / m 3 , the existing biomass boilers do not meet the requirements of this standard, which has seriously hindered the large-scale and large-scale application of industrial production

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