Method and device of denitration utilizing biomass direct burning and re-burning as well as smoke gas recirculating technology

A flue gas recirculation and biomass technology, applied in combustion equipment, lighting and heating equipment, etc., can solve the problems of limited reserves and high operating costs, and achieve the effect of reducing emissions, reducing technical risks and costs

Inactive Publication Date: 2007-08-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's natural gas resources are mainly distributed in the west, and the reserves are limited. Natural gas is used as the reburning fuel, and the operating cost is relatively high

Method used

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  • Method and device of denitration utilizing biomass direct burning and re-burning as well as smoke gas recirculating technology

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Experimental program
Comparison scheme
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specific Embodiment approach 1

[0020] Specific implementation mode 1: The method for denitrification using biomass direct combustion and re-combustion and flue gas recirculation process in this embodiment, the specific steps are:

[0021] A. The pulverized coal enters the main combustion zone X at the bottom of the furnace of the pulverized coal furnace through the burner 21 of the pulverized coal furnace and burns to form flue gas containing NOx;

[0022] B. Use the mixture of primary air 30 to mix and recirculate the tail flue gas to spray biomass particles into the middle of the furnace to form a reburning reduction zone Y;

[0023] C. Biomass particles precipitate active groups such as hydrocarbon groups and amino groups under the condition of low stoichiometric ratio in the reburning reduction zone Y, and react with NOx formed in the main combustion zone X of the pulverized coal furnace to form N 2 At the same time, biomass coke and NOx undergo a heterogeneous reduction reaction in the reburning reduct...

specific Embodiment approach 2

[0033] Specific embodiment 2: The difference between the denitrification device using biomass direct combustion and reburning and flue gas recirculation process in this embodiment and the specific embodiment 1 is that the feeding device 1 is composed of a feeding bin 11 and an auger 12, The auger 12 is fixed on the bottom of the feeding bin 11, and the outlet of the auger 12 communicates with the primary air inlet duct 4.

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between the denitrification device using biomass direct combustion and reburning and flue gas recirculation process in this embodiment and specific embodiment one is that it also includes a biomass pulverizing device 5 and a buried scraper hoist 6. The outlet of the biomass crushing device 5 is connected with the inlet of the biomass feeding device 1 through a buried scraper elevator 6 . After the biomass is crushed by the biomass crushing device 5 , it is transported to the biomass feeding device 1 by the buried scraper elevator 6 .

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Abstract

The present invention belongs to a denitration method by utilizing biomass direct combustion and secondary combustion and flue gas recirculating process and its equipment, and relates to a coal powder boiler low NOx combustion process and its equipment. The invented method includes the following steps: making coal powder be passed through the combustor of coal powder boiler and fed into main combustion zone to make combustion and form the flue gas containing NOx; utilizing the mixture of once air and recirculating tail portion flue gas to spray biomass particles into secondary combustion reduction zone and make NOx formed in the main combustion zone be reacted and formed into N2; at the same time make the biomass coke ad NOx produce isophase reduction reaction to form Nz; spraying burning air from upper portion of secondary combustion reduction zone to make non-burnt combustible material be burnt up.

Description

technical field [0001] The invention relates to a pulverized coal boiler low NOx combustion technology and a device thereof, in particular to a combustion method and a device for utilizing biomass direct combustion and reburning denitrification. Background technique [0002] Pulverized coal combustion is an important source of nitrogen oxide emissions. The denitrification efficiency of existing low-excess air ratio, air-staged combustion technology, and dense-lean combustion technology and other low-NOx combustion technologies is generally lower than 50%, so they cannot meet the increasingly stringent environmental protection requirements. Require. Reburning technology, also known as fuel classification or in-furnace reduction (IFNR) technology, is one of the most effective measures among many in-furnace methods to reduce NOx emissions. The denitrification efficiency of reburning technology can reach more than 60%. At present, most of the existing reburning and denitrificat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C9/06
Inventor 吴少华刘辉孙绍增邱朋华孙锐秦明李争起秦裕琨
Owner HARBIN INST OF TECH
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