Coal gasification system and gasification process

A technology of coal gasification and coal gas, which is applied to the gasification of granular/powdered fuels, the petroleum industry, and the manufacture of combustible gases. It can solve the problems of low carbon conversion rate, difficulty in handling fly ash, and difficult reaction, and achieve an increase in carbon conversion rate. , prevent damage, fully respond to the effect

Pending Publication Date: 2019-05-21
KEDA MAS CLEAN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of low carbon conversion rate, difficult handling of fly ash and difficult reaction in the existing coal gasification process, the present invention provides a coal gasification system capable of collecting the fly ash in the coal gasification reaction and returning to gasification The furnace is fully mixed with the reaction medium, which greatly improves the reaction efficiency of the fly ash after returning to the gasifier and avoids coking

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  • Coal gasification system and gasification process
  • Coal gasification system and gasification process
  • Coal gasification system and gasification process

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, a coal gasification system includes a gasification device, a heat exchange device and a dust removal device 5 connected in sequence. Among them, the gasification device is a device for coal gasification reaction, the heat exchange device is used to cool down the high-temperature gas generated by the gasification device and recover heat, and the dust removal device 5 is used to remove fly ash particles in the gas to improve the cleanliness of the gas. degree, and the removed fly ash particles are collected and transported back to the gasification device for secondary reaction to increase the carbon conversion rate and gas production of the entire system. The work of the system will be elaborated below by making a detailed description of the specific structure and connection relationship of each device.

[0043] In this embodiment, a gasifier 1 is used as a gasification device, and the type of the gasifier 1 is a common fluidized bed gasifier o...

Embodiment 2

[0060] When the coal gasification system in Example 1 is working, the fly ash particles in the gas can be separated and collected by the dust removal device 5, and the collected fly ash particles are sent to the fly ash burner 10 through the pipeline to be mixed with steam and oxygen-enriched air , and then sent to the gasifier 1 for reaction. However, since the amount of fly ash particles collected per unit time is not fixed, the speed at which the fly ash particles are transported to the fly ash burner 10 through the pipeline cannot be kept consistent, thereby affecting the mixing of fly ash particles with steam and oxygen-enriched air The effect is to reduce the reaction efficiency of fly ash after returning to the furnace. In addition, fly ash particles have a certain degree of adhesion, and the pressure in the pipe is not stable enough when it is transported in the pipe. The fly ash is easily adsorbed on the inner wall of the pipe, causing blockage.

[0061] In view of t...

Embodiment 3

[0066] The coal gasification system of embodiment 2 can continuously and quantitatively send fly ash particles to the fly ash burner 10 through the pneumatic conveying device, and it adopts a bag filter as the dust removal device 5. The separation effect is very good, and the separation rate can reach 99% even for fly ash particles with a particle size below 1 micron. However, this approach also brings some problems:

[0067] (1) Due to the excellent dust removal effect of the bag filter, the amount of fly ash particles separated and collected per unit time is relatively large. On the one hand, a large number of fly ash particles are more likely to cause blockage of the transportation pipeline; It is not conducive to the full mixing with steam and oxygen-enriched air in the fly ash burner 10, and affects the reaction efficiency of the fly ash after returning to the furnace;

[0068] (2) Only a single bag filter with good dust removal effect is used to separate the fly ash parti...

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Abstract

The invention discloses a coal gasification system and a gasification process, and belongs to the field of gas manufacturing. The system comprises a gasifier, a dust removal device and a fly ash burner. The air inlet end of the dust removal device is connected with an air outlet of the gasifier. The fly ash burner includes a gasifier channel, a steam channel and a pulverized coal channel. The inlet end of the gasifier channel is connected with a gas source, and the inlet end of the steam channel is connected with a steam device. The inlet end of the pulverized coal channel is connected with adischarge outlet of the dust removal device; the outlet ends of the gasifier channel, the steam channel and the pulverized coal channel are connected with a premixing zone of the fly ash burner, and the premixing zone is connected with a return inlet of the gasifier. The coal gasification system is used for gas production, fly ash in a coal gasification reaction can be collected and fully mixed with a reaction medium before returning to the gasifier, the reaction efficiency of the fly ash after returning to the gasifier is greatly improved and coking is avoided.

Description

technical field [0001] The invention belongs to the field of coal gas production, and more specifically relates to a coal gasification system and a gasification process. Background technique [0002] my country is a country rich in coal, short of oil and low in gas. This energy structure background determines that coal will remain the mainstay of my country's energy and an important pillar of my country's economic development for a long time to come. Among the various utilization methods of coal, the coal gasification process is the process of converting solid raw coal, which is difficult to process and remove useless components, into a gas that is easy to purify and apply. Up to now, people have developed a variety of reactors, including fixed-bed, fluidized-bed and entrained-bed reactors to achieve the purpose of coal gasification to produce fuel gas and synthesis gas. Among these reactors, the fluidized bed coal gasification reactor has been widely used in the field of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/56C10J3/72C10J3/84C10J3/54
Inventor 朱晨军高艳艳张爱美丁明雷颜宗洋尹小伟
Owner KEDA MAS CLEAN ENERGY
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