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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, biomass three-stage entrained bed gasification, can solve the problems of carbon conversion efficiency reduction, corrosion, metal corrosion, etc., to achieve wide distribution, large quantity, The effect of protecting the environment

Inactive Publication Date: 2013-04-17
ZHONGJIEHUAN BEIJING ENERGY TECH
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AI Technical Summary

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-bed gasification furnace 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...

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

A gasifier of biomass three-stage entrained flow bed using exhausted heat includes a high-temperature entrained flow bed, a high-temperature heat exchanger and a low-temperature heat exchanger. A quenching chamber and a high-temperature super-heater are arranged in the high-temperature heat exchanger. The temperature of synthetic inlet gas of the quenching chamber is ranged from 1000 to 1100 degrees centigrade. The temperature of synthetic outlet gas of the quenching chamber is ranged from 700 to 800 degrees centigrade. The inner wall of the low-temperature heat exchanger is equipped with optical tube film-type water cooled wall. A low-temperature super-heater and an economizer are arranged in the low-temperature heat exchanger. The gasification method of the gasifier of biomass three-stage entrained flow bed using exhausted heat involves that coal powder, pyrolysis gas and oxygen after biomass pyrolysis flow into the entrained flow bed through the burner to obtain synthetic gas by gasification, and exhausted heat of gasification is passed to water by the heat exchanger of the gasifier to obtain super-heat steam. High-temperature synthetic gas flows out from the gasifier after cooling.

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 Patents(China)
IPC IPC(8): C10J3/56C10J3/54C10J3/72
CPCC10J2300/094C10J3/86C10J3/62C10J3/76C10J2300/0916C10J2300/1846C10J3/485C10J2300/0959Y02P20/129
Inventor 张泽
Owner ZHONGJIEHUAN BEIJING ENERGY TECH
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