Method for in-situ removal of nitrogen pollutants in biomass fuel gas in biomass gasifier

A biomass and gasifier technology, applied in the direction of nitrous oxide capture, chemical instruments and methods, gasification process, etc., to achieve the effect of reducing emission concentration, efficient removal, widespread promotion and use value

Active Publication Date: 2016-08-10
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The above-mentioned patents are all methods for reducing nitrogen oxide emissions in the process of biomass or coal combu...

Method used

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  • Method for in-situ removal of nitrogen pollutants in biomass fuel gas in biomass gasifier
  • Method for in-situ removal of nitrogen pollutants in biomass fuel gas in biomass gasifier
  • Method for in-situ removal of nitrogen pollutants in biomass fuel gas in biomass gasifier

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Embodiment 1

[0050] The biomass gasifier adopts a fixed-bed gasifier, the biomass uses corn stalks (N mass content is 0.83%), and the exogenous metal-based catalyst (Ca(OH) 2 ) to corn stalks to prepare metal-doped corn stalks or metal-impregnated corn stalks rich in extrinsic metal salts, Ca(OH) 2 The mass ratio of corn stalks is 2%. The gasification agent uses air for gasification, the feeding amount of corn stalks is 250kg / h, and the total air flow rate is 300Nm 3 / h, respectively set air inlets in the furnace and the bottom of the furnace, and the air flow in the furnace is 180Nm 3 / h, the bottom air flow rate is 120Nm 3 / h, the gas flow direction and biomass flow direction of this gasification method take part in the attached figure 1 , the obtained raw gas is drawn from the reduction zone (also the biomass gasification zone). The temperatures of pyrolysis zone, oxidation zone 1, reduction zone and oxidation zone 2 are 500°C, 850°C, 750°C, and 900°C, respectively. The raw gas tem...

Embodiment 2

[0061] The biomass gasifier adopts a fixed-bed gasifier, using soybean straw (3.2% N by mass) as raw material, and exogenous metal-based catalyst Ca(OH) by solution impregnation. 2 , Fe 2 (SO 4 ) 3 , Mg(OH) 2 Adding to bean straw, the metal-soaked bean straw rich in extrinsic Ca salt, Fe salt, Mg salt, Ca(OH) 2 , Fe 2 (SO 4 ) 3 The mass ratio of soybean straw is 2%, 5%, 20%, Mg(OH) 2 The mass ratio of bean straw to bean straw is 20%, the gasification agent uses air for gasification, the feeding amount of bean straw is 250kg / h, and the total air flow rate is 300Nm 3 / h, respectively set air inlets in the furnace and the bottom of the furnace, and the air flow in the furnace is 180Nm 3 / h, the bottom air flow rate is 120Nm 3 / h, crude gas is drawn from the gasification zone. The temperatures of pyrolysis zone, oxidation zone 1, reduction zone and oxidation zone 2 are 500°C, 850°C, 750°C, and 900°C, respectively. The raw gas temperature is 550°C.

[0062] NH in the ra...

Embodiment 3

[0068] The biomass gasifier adopts a fixed-bed gasifier, using corn stalks (N mass content of 0.83%) as raw material, and exogenous metal-based catalyst Fe by solution impregnation. 2 (SO 4 ) 3 Added to corn stover to make metal-impregnated corn stover rich in extrinsic Fe salts, Fe 2 (SO 4 ) 3 The mass ratio of corn stalks is 2%, the gasification agent uses air for gasification, the feeding amount of corn stalks is 250kg / h, and the total air flow rate is 300Nm 3 / h, respectively set air inlets in the furnace and the bottom of the furnace, and the air flow in the furnace is 180Nm 3 / h, the bottom air flow rate is 120Nm 3 / h, crude gas is drawn from the gasification zone. The temperatures of pyrolysis zone, oxidation zone 1, reduction zone and oxidation zone 2 are 500°C, 850°C, 750°C, and 900°C, respectively. The raw gas temperature is 550°C.

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Abstract

The invention discloses a method for in-situ removal of nitrogen pollutants in biomass fuel gas in a biomass gasifier. An exogenous metal-based catalyst is added into biomass in the biomass gasifier and combined with the catalytic action of endogenous mineral components of the biomass to enable the biomass to be subjected to catalytic pyrolysis, biomass nitrogen is converted into N2 in a high selectivity manner, HCN and NH3 produced by self pyrolysis of the biomass are used to reduce NOx and N2O produced by semi-coke oxidation, the biomass nitrogen is catalyzed to be converted into nitrogen in an oriented manner during the process of biomass gasification, pollution control with pollutants is realized, most of nitrogen is converted into N2 in the gasifier to the uttermost extent, content of the nitrogen pollutants in gasification crude gas is reduced from the source, efficient in-situ removal of the nitrogen pollutants inside the biomass gasifier is realized, the total removal rate of the nitrogen pollutants is 60-80%, and the method has wide popularization and use value.

Description

Technical field: [0001] The invention relates to the field of biomass crude gas purification, in particular to a method for in-situ removal of nitrogen-containing pollutants from biomass crude gas in a biomass gasification furnace. Background technique: [0002] Biomass gasification converts biomass into high-grade crude gas for industrial power generation, combined heat and power generation, centralized gas supply, industrial heating and other processes, and is one of the hotspots in the current research field of renewable energy utilization. The nitrogen content per unit mass of commonly used biomass is low (0.1-0.5%, wt), much lower than the nitrogen content of coal (1.5%, wt), so the emission of nitrogen-containing pollutants during biomass gasification is often ignored. However, the calorific value of biomass is generally half or even lower than that of coal. Therefore, from the perspective of nitrogen content per unit calorific value, the emission of nitrogen-containin...

Claims

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Application Information

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IPC IPC(8): C10J3/72B01D53/56B01D53/76
CPCY02C20/10Y02P20/52C10J3/72B01D53/56B01D53/76B01D2251/20B01D2251/2062C10J3/725C10J2300/0916C10J2300/0986C10J2300/1603
Inventor 谢建军袁洪友阴秀丽吴创之
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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