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Method and device for reducing nitrogen oxides in smoke gas of industrial coal-fired boiler by biomass

A technology of industrial boilers and nitrogen oxides, which is applied in the direction of solid fuel combustion, combustion equipment, lighting and heating equipment, etc., can solve the problems of unfavorable biomass combustion and low flue gas temperature, and achieve enhanced rigidity and reduction zone mixing Conditions, the effect of improving efficiency

Active Publication Date: 2014-12-17
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

[0004] 2. Generally, the flue gas temperature of industrial boilers is low, which is not conducive to the direct reburning and denitrification of biomass

Method used

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  • Method and device for reducing nitrogen oxides in smoke gas of industrial coal-fired boiler by biomass
  • Method and device for reducing nitrogen oxides in smoke gas of industrial coal-fired boiler by biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 As shown, the common poplar sawdust in North China was selected as the biomass material, and a 2t / h coal-fired experimental boiler was selected for testing. Part of the hot flue gas from the tail flue of the coal-fired experimental boiler was used to transport the biomass particles through the conveying pipe 3. The pyrolysis section H is sprayed into the furnace to form the reduction zone R. The biomass particles undergo pyrolysis reaction in the pyrolysis section H, and active groups such as hydrocarbon groups and amino groups are precipitated.

[0034] The calorific value of biomass particles accounts for 1.2% of the total calorific value of the boiler. The temperature of the hot flue gas from the flue at the tail of the boiler is 110°C, and the amount of flue gas is 5% of the exhaust gas volume of the boiler. The excess air coefficient after carrying biomass particles is 0.65. The temperature of the pyrolysis section H is 950°C, and the residence time o...

Embodiment 2

[0038] The process conditions of this embodiment are roughly the same as those of Embodiment 1, wherein the temperature of the pyrolysis section H is 1050° C., and the temperature of the reduction zone R is 900° C., and the denitrification efficiency reaches 55% at this time.

Embodiment 3

[0040] The process conditions are roughly the same as in Example 1, wherein the temperature of the pyrolysis section H is 900° C., and the temperature of the reduction zone R is 700° C., and the denitrification efficiency reaches 38%.

[0041] In summary, the method and device of the present invention can effectively promote the same-phase reduction reaction between hydrocarbon groups, amino groups and other active groups and nitrogen oxides in boiler flue gas, and the residual coke after biomass pyrolysis and boiler smoke The heterogeneous reduction reaction between nitrogen oxides in the gas greatly reduces the concentration of nitrogen oxides in the flue gas of industrial boilers, and the denitrification rate reaches 30%-60%. The purpose of reducing pollution and protecting the environment can be achieved by using readily available biomass raw materials, and it is easy to modify existing boilers to meet environmental protection requirements. Therefore, this technology has ex...

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Abstract

The invention discloses a method and a device for reducing nitrogen oxides in smoke gas of an industrial coal-fired boiler by biomass. The method comprises the following steps that biomass particles are subjected to high-temperature pyrolytic reaction in the conveying process to separate out residue coke and active groups including hydrocarbon groups and amino groups as well as residual coke; the pyrolyzed biomass particles are sprayed into a hearth of the industrial coal-fired boiler for forming a reducing region to take reaction with the smoke gas. The device comprises a biomass particle conveying device, a spray nozzle and a recirculation fan, wherein the biomass particle conveying device is formed by connecting a biomass hopper, a biomass feeding machine and a conveying pipe, the conveying pipe extends into the hearth of the industrial coal-fired boiler, the part, positioned in the hearth, of the conveying pipe is a high-temperature decomposition section, the spray nozzle is arranged at the tail end of the conveying pipe, and the recirculation fan is connected between the conveying pipe and a boiler tail smoke passage. The method and the device aim at the smoke gas exhaust characteristics of the industrial coal-fired boiler, the efficient denitration for the nitrogen oxides in the smoke gas of the industrial coal-fired boiler can be realized, the denitration rate reaches 30 percent to 60 percent, and wide popularization and use values are realized.

Description

technical field [0001] The invention relates to a method and a device for reducing nitrogen oxides in coal-fired industrial boiler flue gas with biomass, and belongs to the technical field of biomass energy utilization and coal-fired industrial boiler flue gas denitrification. Background technique [0002] Due to the large number of coal-fired industrial boilers in my country, the average evaporation is small, the amount of pollutants discharged by a single unit is small, and the total amount of pollutants discharged is large, the impact on nitrogen oxides (NO x ) contributes a huge amount to emissions, ranking third after the thermal power industry and motor vehicle exhaust, and is one of the main sources of pollution affecting the quality of urban air environment. At present, my country's fixed source NO x Low-nitrogen combustion and reduction methods (selective catalytic reduction method, selective non-catalytic reduction method) are mostly used in emission reduction con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23B90/06F23B70/00
Inventor 束韫张凡王洪昌朱金伟田刚黄家玉刘宇王红梅
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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