A system and method for co-combustion of biomass fuel and semi-coke

A biomass fuel and biomass technology, applied in the direction of combustion methods, solid fuel combustion, fuel supply, etc., can solve problems such as difficulties, and achieve the effects of enhancing adaptability, promoting burnout, and complete gas-solid separation

Active Publication Date: 2019-10-11
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method that can achieve a large proportion of mixed burning semi-coke and utilize biomass, pyrolysis and gasification of biomass, co-firing of gasification products and semi-coke, fully improving the efficiency of biomass utilization, and solving the problem of semi-coke. Focus on the difficulty of ignition and stable combustion, improve fuel adaptability, and reduce furnace outlet NO x System and method for co-combustion of concentrated biomass fuel and semi-coke

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  • A system and method for co-combustion of biomass fuel and semi-coke

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0029] See figure 1 , The invention provides a biomass fuel and semi-coke mixed combustion system, including a feeder 1, a biomass gasifier 2, a first-stage cyclone separator 3, a second-stage cyclone separator 4, a cyclone dust collector 5, High-temperature fan 6, coal feeder 7, coal mill 8, boiler body 9, air preheater 17, high-temperature dust collector 18, induced draft fan 19 and chimney 20, as well as the ignition zone 11, which is arranged in the furnace from bottom to top, Main combustion zone 12, reburn zone 13 and burnout zone 14.

[0030] When working, the semi-coke enters the main combustion zone 12 of the furnace through the coal feeder 7 and the coal mill 8, and the biomass fuel passes through the feeder 1, the biomass gasifier 2, the primary cyclone separator 3, and the secondary cyclone separator After 4, the gas-solid two phases are separated, a...

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Abstract

The invention discloses a biomass fuel and semi-coke mixed burning system and method. Aiming at the problems of low calorific value of biomass gasification products, difficulty of semi-coke ignition steady burning, high discharge of NOx and the like, the biomass fuel and semi-coke mixed burning method is adopted, gasification is performed on biomass fuel through a gasification furnace, flammable gaseous products are fed into an ignition area and a reburning area which are arranged inside a furnace cavity, meanwhile, solid residues are fed into a main burning area for mixed burning with semi-coke, the problem of difficulty of semi-coke ignition steady burning is solved, and by means of layering mixed burning inside the furnace, a reducing atmosphere area is formed at the upper portion of the main burning area, so that burning optimization is realized, the NOx discharge quantity is reduced at the same time, and meanwhile, part of hot air inside an air preheater is fed into the gasification furnace and a two-stage cyclone separator is adopted, so that the air fan investment is reduced, the energy utilization rate is increased, and the gasification furnace efficiency is improved.

Description

Technical field [0001] The invention relates to a system and method for mixed combustion of biomass fuel and semi-coke. Background technique [0002] Among the coal varieties in my country, low-rank coal accounts for more than 55%. The low-rank coal will obtain by-product semi-coke during the fractional conversion process. Semi-coke is a low-volatile solid carbon product obtained by dry distillation and pyrolysis of high-volatile bituminous coal with no cohesion or weak cohesion under medium and low temperature conditions. Because the chemical structure of low-rank coal has more side chains and higher hydrogen and oxygen content, the semi-coke has high fixed carbon, high calorific value, high chemical activity, low sulfur content, low volatile content, and low ash content. . When the semi-coke is burned, there is very little flue gas, and no tar is formed when heated, and the thermal efficiency of combustion is significantly higher than that of coal. However, the characterist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23B90/06F23J15/02F23J15/06F23K1/00F23K1/04F23L15/04
CPCF23B90/06F23J15/027F23J15/06F23K1/00F23K1/04F23L15/04Y02E20/34
Inventor 王长安陶子宸王鹏乾刘成昌赵林杜勇博车得福
Owner XI AN JIAOTONG UNIV
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