Device for NOx reduction and grate firing by stokehold screening, gasifying and reburning

An equipment and sorting technology, applied in combustion equipment, lighting and heating equipment, combustion of solid fuel, etc., can solve the problems of industrial boilers not receiving sufficient attention, not enough attention, reducing NOx emission technology, etc., to reduce solid Effects of incomplete combustion loss, reduction of NOx emissions, and improvement of combustion efficiency

Active Publication Date: 2014-09-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the NOx emission reduction work of industrial boilers has not received sufficient attention (the NOx emission of industrial boilers is less than that of power station pulverized coal boilers, so the current attention is not enough and it is not applicable to reduce NOx emissions of existing power station pulverized coal boilers technology)

Method used

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  • Device for NOx reduction and grate firing by stokehold screening, gasifying and reburning

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Experimental program
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Effect test

specific Embodiment approach 1

[0014] Specific implementation mode one: combine figure 1 Explain, a kind of pre-furnace sorting, gasification and recombustion equipment for reducing NOx layer combustion in this embodiment, the equipment includes boiler coal hopper 1, fan 2 and coal-fired conveying device 4, and the equipment also includes pre-furnace screening and sorting Device 5, transition pipe 6, gasification gas pipeline 7, combustion air pipeline 8, fixed bed gasifier 9, screw material conveyor 10 and gasification gas nozzle 11;

[0015] The screening and sorting device 5 in front of the furnace includes a large particle coal hopper 5-1, a medium particle coal hopper 5-2 and a small particle coal hopper 5-3, and the medium particle coal hopper 5-2 is arranged on the large particle coal hopper 5- 1 and the small particle coal hopper 5-3, the feeding chambers of the large particle coal hopper 5-1, the medium particle coal hopper 5-2 and the small particle coal hopper 5-3 are connected and arranged, and ...

specific Embodiment approach 2

[0016] Specific implementation mode two: combination figure 1 Illustrate, the aperture of the small sieve sieve 5-3-1 of the present embodiment<6mm, the aperture of the middle sieve 5-2-1 is 6-15mm, the aperture of the large sieve 5-1-1 15-25mm. Suitable for screening lump coal. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0017] Specific implementation mode three: combination figure 1 Illustrate, the aperture of the small sieve sieve 5-3-1 of the present embodiment<6mm, the aperture of the middle sieve 5-2-1 is 6-20mm, the aperture of the large sieve 5-1-1 20-50mm. Suitable for screening mixed coal. Others are the same as in the first embodiment.

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Abstract

A device for NOx reducing and grate firing by stokehold screening, gasifying and reburning belongs to the technical field of environment-friendly equipment and aims to realize the low NOx discharge amount and high efficiency burning of a grate firing industrial boiler. A stokehold screening and sorting device comprises a large-particle coal hopper, a medium-particle coal hopper and a small-particle coal hopper, wherein the medium-particle coal hopper is arranged between the large-particle coal hopper and the small-particle coal hopper, material inlet cavities of the large-particle coal hopper, the medium-particle coal hopper and the small-particle coal hopper are communicated with each other, a large-mesh screen is arranged in the large-particle coal hopper, a medium-mesh screen is arranged in the medium-particle coal hopper, the small-mesh screen is arranged in the small-particle coal hopper, a fire coal conveyer device is communicated with the small-particle coal hopper, the small-particle coal hopper and the medium-particle coal hopper are communicated with a spiral material conveyer which is communicated with a boiler coal hopper, the boiler coal hopper is communicated with a boiler, the large-particle coal hopper is communicated with a fixed bed gasification furnace, a gasifying gas outlet of the fixed bed gasification furnace is communicated with a gasifying gas spray nozzle by a fan and a gasifying gas pipeline, combustion air pipeline is communicated with the gasifying gas spray nozzle which is arranged in the boiler. The device is matched with the boiler for use.

Description

technical field [0001] The invention relates to equipment for reducing NOx layer combustion, which belongs to the technical field of environmental protection equipment. Background technique [0002] There are about 546,000 coal-fired industrial boilers in service in my country, accounting for 85% of the total number of industrial boilers currently in service, and increasing at a rate of about 1.5% every year. The annual coal consumption of coal-fired industrial boilers is 500-600 million tons, accounting for about 18% of the country's total annual coal consumption. The annual total energy consumption and pollution discharge of industrial boilers both rank second in the national industrial industry. [0003] In the research on the emission reduction of industrial boiler pollutants, SO 2 The research on smoke and dust was carried out relatively early, and a lot of research results have been obtained, and they have been applied industrially. Due to the low-temperature combus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23B90/06F23K1/00
Inventor 高建民赵广播吴少华高继慧杜谦徐力孙锐孙绍增秦裕琨
Owner HARBIN INST OF TECH
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