Layer-burning boiler for achieving fuel-air-smoke three-stage low-nitrogen burning and system thereof

Abstract

The invention discloses a layer-burning boiler for achieving fuel-air-smoke three-stage low-nitrogen burning and a system of the layer-burning boiler for achieving fuel-air-smoke three-stage low-nitrogen burning. The boiler comprises a front arch, a rear arch corresponding to the front arch, a hearth, a throat, a burning chamber and a conveying belt below the hearth, wherein the hearth, throat andthe burning chamber are sequentially formed through the front arch and the rear arch from bottom to top, and complete burning of volatile components can be ensured. In the system, some recycling smoke from an outlet of a smoke extraction fan and a certain amount of water vapor produced by a steam generator are doped in primary air fed into other air bins except for a volatile component air bin, the oxygen content of primary air introduced into a fire grate can be reduced through recycling smoke, the water steam and hot coke are subjected to a water-gas reaction on the fire grate to generate CO and H2, partial gas-solid reaction is converted into gas phase reaction, and on the other hand, CO can increase the thickness of a reduction layer above a coal layer, and NOx generated by coal layerburning is effectively reduced; and on the condition of no large auxiliary machine equipment is added, generation of NOx can be actively reduced, and the dual purposes of energy saving and emission reduction are achieved.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide emission control by a layer-fired boiler, in particular to a layer-fired boiler with three-stage low-nitrogen combustion of fuel, air, and flue gas and a system thereof. Background technique [0002] The number of coal-fired industrial boilers in my country is about 400,000 units, and the annual consumption of standard coal is more than 400 million tons of standard coal, accounting for 20% of the country's total annual coal consumption. As of the end of 2016, the total heating area of ​​urban and rural buildings in northern my country was about 20.6 billion square meters. Among them, coal-fired heating is the main way of heating energy in northern my country. The area of ​​coal-fired heating in northern my country accounts for about 83% of the total heating area. , geothermal energy, biomass energy, solar energy, industrial waste heat, etc. accounted for about 17% in total. Coal-fired indus...

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Problems solved by technology

If the flue gas denitrification treatment technology such as SCR/SNCR in the furnace is adopted, there will be a

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