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Biomass boiler selective catalytic reduction (SCR) denitration technology

A technology of biomass boiler and reduction method, which is applied in the field of denitrification process of biomass boiler, can solve the problems of high water vapor content, high sodium ion content, high heavy metal content, etc., and achieve the goal of reducing reaction temperature, improving reaction efficiency and low operating cost Effect

Inactive Publication Date: 2019-10-18
湘潭南方环保科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) NOx emission: Nitrate emission is a difficult point in the flue gas treatment of biomass boilers. Due to the low combustion temperature and strong corrosiveness of flue gas components, it is difficult for coal-fired power plants to meet the current emission standards for denitrification.
[0008] The flue gas after combustion of biomass boilers has a series of characteristics such as high content of potassium and sodium ions, high water vapor content, and high content of heavy metals. The catalyst used in traditional coal-fired boilers cannot be applied

Method used

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  • Biomass boiler selective catalytic reduction (SCR) denitration technology

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Experimental program
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Effect test

Embodiment 1

[0036] A biomass boiler in Henan adopts the denitrification process of the biomass boiler SCR catalytic reduction method of the present invention, and uses NH 3 As a reducing agent, the reaction temperature is 280°C, and the catalyst used is (according to the mass percentage of biomass):

[0037] Vanadium pentoxide 0.35%, molybdenum trioxide 0.4%, manganese dioxide 0.35%.

[0038] Emission indicators such as image 3 And as shown in the following table (display data 0 means not detected):

[0039] SO 2

[0040] In addition, its various indicators are far lower than the environmental protection regulations. Therefore, it has been exempted from operation under heavy air pollution weather.

Embodiment 2

[0042] A company in Guangxi adopts the denitrification process of biomass boiler SCR catalytic reduction method of the present invention, using NH 3 As a reducing agent, the reaction temperature is 280°C, and the catalyst used is (according to the mass percentage of biomass):

[0043] Vanadium pentoxide 0.4%, molybdenum trioxide 0.45%, manganese dioxide 0.3%.

[0044] While the denitrification transformation project is up to standard acceptance, the amount of reducing agent ammonia water is reduced from 180L / h to 70L / h, and the annual operating cost is saved by 800,000 yuan (saved water, electricity, and loss of boiler efficiency caused by excessive injection of ammonia water, The crystallization corrosion of the heating surface at the tail is not included).

Embodiment 3

[0046] Taking fly ash collected by a biomass power plant dust collector, the power plant fuel analysis is as follows:

[0047] The main biomass fuel types are: corn stalks, wheat bran, branches, wood scraps, roots, bark, bean stalks, chili stalks, peanut shells, wheat straw, cotton stalks, sesame stalks and corncobs. Comprehensively considering the characteristics, sources and seasonal factors of biomass fuel, the fuel composition for the design working condition of the biomass boiler is 35% of straw, 50% of secondary fuelwood materials, and 15% of wheat bran.

[0048] Table 1

[0049] fuel car Har Oar Nar Sar War Aar V r

Qar,net design fuel 26.96 3.63 25.67 0.87 0.07 34.1 8.7 53 9521kj / kg Check fuel 31.02 4.13 29 0.67 0.08 29.4 5.7 57.1 11175kj / kg

[0050] The fly ash composition analysis is as follows:

[0051] SiO 2

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Abstract

The invention discloses a biomass boiler selective catalytic reduction (SCR) denitration technology. A composite active substance is introduced into the SCR denitration technology to serve as a catalyst, the reaction temperature is decreased to 260-290 DEG C, and the catalyst is prepared from the following components in percentage by mass of biomass: 0.25-1% of vanadium pentoxide, 0.25-1% of molybdenum trioxide, and 0.25-1% of manganese dioxide. According to the composite active substance, the problem of catalyst inactivation can be completely solved, the operation cost is low, operation is stable, up to now, the maximum operation time has reached two years, and the life of the catalyst is fully tested. According to the catalyst, the reaction temperature can be decreased to 260-290 DEG C,the reaction temperature is significantly decreased, and meanwhile, the reaction efficiency is improved to 80% or above.

Description

technical field [0001] The invention relates to a denitrification process of a biomass boiler, in particular to a denitrification process of a biomass boiler with an SCR catalytic reduction method. Background technique [0002] Different from traditional thermal power generation that uses non-renewable resources such as coal and oil, biomass power generation uses mainly agricultural and forestry wastes as fuel, such as straw, straw, bark, branches, waste furniture, etc., which is a type of renewable energy power generation. Biomass power plants are limited by fuel transportation and are generally scattered in areas with developed agriculture or forestry. At present, there are more than 400 biomass power plants in the country, generally a single set of 30MW generating units, and it is estimated that there are more than 500 sets of single biomass power plant boilers. [0003] As a new energy power generation technology, biomass energy is different from wind energy and solar e...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01J23/34
CPCB01D53/8628B01D2251/2062B01J23/002B01J23/34B01J2523/00B01J2523/72B01J2523/68B01J2523/55
Inventor 王赛锋唐稷南
Owner 湘潭南方环保科技开发有限公司
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