Biomass three-section type entrained flow bed gasification technology with function of waste heat utilization

An entrained-bed, three-stage technology, applied in the field of biomass gasification and biomass three-stage entrained-bed gasification, can solve the problems of reduced carbon conversion efficiency, corrosion, metal corrosion, etc. The effect of protecting the environment

Inactive Publication Date: 2010-05-19
ZHONGJIEHUAN BEIJING ENERGY TECH
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Problems solved by technology

[0008] First, entrained bed gasification has strict restrictions on the particle size of raw materials. The raw materials entering the entrained bed need to be ground into ultrafine particles. The raw material is ground to meet the particle size required for entrained bed operation, which makes it impossible to directly use biomass raw material for entrained bed gasification
[0009] Second, the outlet temperature of the entrained bed synthesis gas is very high, generally above 1300°C, and the application of the synthesis gas needs to be purified or converted, which requires the temperature of the synthesis gas to be reduced to about 250°C. If not fully utilized, it will lead to inefficiency of the entire gasification system
[0010] Third, due to the high content of alkali metals (K, Na) in biomass raw materials, they exist in gaseous form at high temperature, and during the cooling process of syngas, they will condense into solid and adhere to On the wall of heat exchanger tubes, causing alkali metal corrosion and slagging of the tubes on the heating surface and blocking the synthesis gas channel
[0011] Fourth, since the synthesis gas obtained from biomass gasification has carbon evolution reaction during the cooling process, a severe carbon evolution reaction will also occur in a certain temperature range, and the CO in the synthesis gas reacts to form CO 2 and carbon black, resulting in a decrease in carbon conversion efficiency and gasification efficiency. At the same time, due to the deposition of carbon black on the metal surface of the heat exchanger tube, it causes metal ashing and metal corrosion.
But for problems 2, 3, and 4, all the technologies for biomass entrained bed gasification in the world at present either do not make good use of the waste heat of synthesis gas, or do not solve the problem of metal ashing in the carbon evolution reaction, or do not have a better solution. Methods to control alkali metal corrosion and slagging

Method used

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  • Biomass three-section type entrained flow bed gasification technology with function of waste heat utilization
  • Biomass three-section type entrained flow bed gasification technology with function of waste heat utilization
  • Biomass three-section type entrained flow bed gasification technology with function of waste heat utilization

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specific Embodiment approach 2

[0107] Implement on the basis of specific implementation mode 1 implementation, such as figure 1 As shown, the top of the high-temperature entrained bed of the three-stage entrained-bed gasifier device is arranged with a down-flow burner, and the carbon powder, pyrolysis gas and oxygen enter the high-temperature en-flow bed through the down-flow burner The gasification reaction is carried out in the high-temperature air-flow bed, the syngas goes down in the high-temperature air-flow bed, enters the high-temperature heat exchanger through the connecting channel formed by the smooth tube membrane water wall on the inner wall, and goes up to cool after being rectified and rectified, and then passes through the inner wall by the smooth tube The connecting channel formed by the membrane water wall enters the low temperature heat exchanger and is rectified by the rectifier and then descends to cool down. The biomass raw material used is still Quercus sp. (see Table 1 in Embodiment 1...

specific Embodiment approach 3

[0114] It is still implemented on the basis of specific implementation mode 1, such as figure 2 As shown, only: the top of the high-temperature entrained bed of the three-stage entrained entrained gasifier device is arranged with a down-flow burner, and the carbon powder, pyrolysis gas and oxygen enter the high-temperature air through the down-flow burner. The gasification reaction is carried out in the entrained bed, and the synthesis gas descends in the high-temperature entrained bed, enters the high-temperature heat exchanger through rectification and constriction to cool down, and then enters the low-temperature heat exchanger through the connecting channel whose inner wall is composed of a smooth tube membrane water wall And after rectification and necking rectification, it goes up to cool down. The biomass raw material used is still Quercus sp. (see Table 1 in Embodiment 1) as an example, and the main process operating conditions are as in Embodiment 1. The result obta...

specific Embodiment approach 4

[0121] It is still implemented on the basis of specific implementation mode 1, such as image 3 As shown, only: the lower part of the high-temperature entrained bed of the three-stage entrained-bed gasifier device is arranged with a horizontal burner, and the charcoal powder, pyrolysis gas and oxygen enter the high-temperature air through the horizontal burner. The gasification reaction is carried out in the entrained bed, and the syngas goes up in the high-temperature entrained bed, enters the high-temperature heat exchanger through rectification and constriction, and then enters the low-temperature heat exchanger through the connecting channel formed by the smooth tube membrane water wall on the inner wall and After being rectified by the rectifier, it is cooled downwards. The biomass raw material used is still Quercus sp. (see Table 1 in Embodiment 1) as an example, and the main process operating conditions are as in Embodiment 1. The result obtained through implementation...

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Abstract

The invention discloses a biomass three-section type entrained flow bed gasification technology with the function of waste heat utilization, which relates to the technical field of energy chemical technology. The gasification technology is realized in a way that: carbon powder, pyrolysis gas and oxygen, which are generated after the biomass is pyrolyzed, enter an entrained flow bed to obtain synthetic gas through gasification, and the energy of the gasification waste heat is transferred to water by a heat exchanger of a gasifier, thereby producing superheated steam. The gasifier of the entrained flow bed is divided into a high-temperature entrained flow bed section, a high-temperature heat exchanger section and a low-temperature heat exchanger section, wherein the high-temperature entrained flow bed section adopts a dry ash extraction entrained flow bed gasification technology, and the temperature of the synthetic gas at the outlet is 1280-1320 DEG C; at the high-temperature heat exchanger section, the temperature of the synthetic gas at the inlet is 1280-1320 DEG C, the temperature at the outlet is 580-600 DEG C, a shock chamber and a high-temperature superheater are arranged in the high-temperature heat exchanger section, and the synthetic gas enters the shock chamber at the temperature of 1000-1100 DEG C and leaves at the temperature of 700-800 DEG C; and at the low-temperature heat exchanger section, the temperature of the synthetic gas at the inlet is 580-600 DEG C, the temperature of the synthetic gas at the outlet is 220-230 DEG C, and a low-temperature superheater and a coal economizer are arranged in the low-temperature heat exchanger section. The invention is used for high-efficiency gasification of biomass.

Description

technical field [0001] The biomass three-stage entrained gasification technology with waste heat utilization of the present invention relates to the technical field of energy and chemical engineering; in particular to the technical field of biomass thermochemistry; especially to the technical field of biomass gasification technology; specifically to the utilization of waste heat The technical field of biomass entrained bed gasification. Background technique [0002] Plants in biomass are organic substances generated by absorbing carbon dioxide in the air through photosynthesis, which are widely distributed, available in large quantities, and are the only renewable natural raw materials that contain hydrocarbon components and heat energy and can be stored; Substances for energy utilization and chemical production, with CO 2 Characterized by zero emissions. With the decrease of traditional fossil energy reserves and the environmental pollution caused by the use of fossil ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/56C10J3/54C10J3/72
CPCC10J2300/094C10J3/56C10J3/86C10J3/62C10J3/76C10J2300/0916C10J2300/1846C10J3/485C10J3/54C10J3/72C10J2300/0959Y02P20/129
Inventor 韩剑锋
Owner ZHONGJIEHUAN BEIJING ENERGY TECH
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