System and method for ultralow volatile carbon-based fuel and lignite low-NOx blending combustion
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A technology of volatile matter and lignite, which is applied in the direction of combustion methods, combustion using block fuel and powder fuel, graded combustion, etc., can solve the problems of easy oxidation and spontaneous combustion, easy weathering and fragmentation, and high greenhouse gas emissions, so as to avoid output Insufficient, weakening adverse effects, avoiding the effect of unsafe drying process
Active Publication Date: 2017-10-24
XI AN JIAOTONG UNIV
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However, lignite has a high moisture content (full moisture is about 25-60%) and low calorific value, which leads to low thermal efficiency of direct combustion and high greenhouse gas emissions; meanwhile, lignite has a volatile content of more than 40%, which is easy to weather and crack Oxidation spontaneous combustion, difficult to store and large-scale development and utilization
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[0030] The present invention will be described in further detail below in conjunction with accompanying drawing
[0031] Such as figure 1 As shown, the present invention is an ultra-low volatile carbon-based fuel and lignite low NO x Co-firing system, including lignite drying system and co-firing system of ultra-low volatile carbon-based fuel and dry lignite.
[0032] The lignite drying system includes raw lignite bin 1, pulverizer 2, drying box 3, pulley 4, conveyor belt 5, small particle size dry lignite bin 6, large particle size dry lignite bin 7, steam pump 8, fan 9, condenser 10 , exhaust gas purification unit 11, steam turbine 31, hot flue gas pipeline and steam pipeline.
[0033]The blending system of ultra-low volatile carbon-based fuel and dry lignite adopts the method of "separate grinding and pulverization, layered blending in the furnace" combined with "fuel reburning", including fan coal mill 12, ultra-low volatile carbon-based fuel Powder bin 13, main burner ...
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Abstract
The invention discloses a system and a method for lignite and ultralow volatile carbon-based fuel low-NOx blending combustion. The system comprises a lignite drying system consisting of a crusher, a drying box, a small-particle-size drying lignite bin, a large-particle-size drying lignite bin, a steam pump, a tail gas purifying unit, a hot smoke pipe, a steam pipe and the like, and a ultralow volatile carbon-based fuel and drying lignite blending combustion system consisting of a fan coal mill, an ultralow volatile carbon-based fuel powder bin, fuel nozzles, a combustor secondary wind nozzle, an over fire air nozzle, a superheater, a tail flue, a coal economizer, an air preheater, a dust remover, a desulfurization device, an over fire air pipe and the like. A lignite drying technology is organically combined with the ultralow volatile carbon-based fuel and drying lignite blending combustion system, so that lignite is safely and effectively used, the problem of difficult ignition and burnout of ultralow volatile carbon-based fuels is solved, and NOx emission is reduced. The system is economical, environmentally friendly, simple, reliable, wide in application range and broad in application prospect.
Description
technical field [0001] The invention belongs to the field of lignite upgrading and high-efficiency clean utilization of coal, in particular to an ultra-low volatile carbon-based fuel and lignite with low NO x Systems and methods for blending. Background technique [0002] At present, the cascade utilization of coal is one of the important ways of clean and efficient utilization of coal. The by-products of coal pyrolysis and gasification, semi-coke and residual carbon, are burned as high-grade clean fuels to generate electricity, which is an important part of realizing clean and efficient cascade utilization of coal. With the rapid development of my country's coal chemical industry, there are a large number of such fuels that need to be burned and utilized urgently. However, the volatile content of pyrolysis semi-coke and gasification residue (hereinafter referred to as "ultra-low volatile carbon-based fuel") is very low, usually the volatile content of pyrolysis semi-coke ...
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