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A method for regulating coal quality in coal gasification process

A coal gasification and process technology, applied in the direction of external electrostatic separator, electrode structure, electrostatic separation, etc., can solve the problems of failing to meet the coal quality requirements of coal gasification process, increasing coal transportation cost, affecting coal gasification operation, etc. Low requirements for coal types, wide application range, and the effect of improving stability

Active Publication Date: 2016-01-06
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

The mixed coal types must be obtained nearby or locally, which will increase the transportation cost of coal for industrial areas with few coal mines or single types of coal.
At the same time, if the mixing is not uniform during coal blending, it will lead to fluctuations in coal quality and affect the operation of coal gasification
Moreover, certain components of some coals are too high or too low, even through coal blending, they cannot meet the coal quality requirements of the coal gasification process.

Method used

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  • A method for regulating coal quality in coal gasification process
  • A method for regulating coal quality in coal gasification process
  • A method for regulating coal quality in coal gasification process

Examples

Experimental program
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Embodiment 1

[0028] The present invention is further illustrated by examples. A coal with a relatively high ash content (42.34%) is selected. The main chemical components and content distribution are shown in Table 1. The separation goal is to make the obtained clean coal meet the coal quality requirements of the Shell coal gasification process with an ash content of 8%~30%.

[0029] Table 1 The main chemical composition and content distribution of raw coal

[0030] components clean coal Ash content quartz Kaolin pyrite Calcite Content % (raw coal) 57.66 42.34 21.32 8.33 5.39 3.86

[0031] The raw coal is ground into coal powder with a particle size of less than 74 μm in a coal mill and dried with hot air. Nitrogen is used to transport the coal powder to a tribo-charged electrostatic separator. The concentration of pulverized coal is selected as 25wt.%. The number of triboelectric electrostatic separation devices is selected as one. The form of the ...

Embodiment 2

[0037] Choose a coal with high sulfur content (7.62%), the main chemical composition and content distribution are shown in Table 3. The separation goal is to make the obtained clean coal meet the coal quality requirements of the Shell coal gasification process with a total sulfur content of less than 5.3%.

[0038] Table 3 The main chemical composition and content distribution of raw coal

[0039] components clean coal Ash content quartz Kaolin pyrite Calcite Total sulfur content Content % (raw coal) 65.61 34.39 16.03 6.51 9.52 2.33 7.62

[0040] The raw coal is ground into coal powder with a particle size of less than 74 μm in a coal mill and dried with hot air. Nitrogen is used to transport the coal powder to a tribo-charged electrostatic separator. The concentration of pulverized coal is selected as 30wt.%. The number of triboelectric electrostatic separation devices is selected as two. The friction charger of one of the friction ...

Embodiment 3

[0046] Choose a coal with low ash content (7.92%) and high sulfur content (5.44%). The main chemical components and content distribution are shown in Table 5. The goal is to adjust the coal quality through sorting and mixing of fly ash, cinder and raw coal, so that the obtained clean coal meets the coal quality requirements of coal gasification process with ash content of 8%~30% and total sulfur content of less than 5.3%.

[0047] Table 5 The main chemical composition and content distribution of raw coal

[0048] components clean coal Ash content quartz Kaolin pyrite Calcite Total sulfur content Content % (raw coal) 92.08 7.92 2.35 0.30 5.16 0.11 5.44

[0049] The fly ash and ash are transported to the coal mill and mixed with the raw coal through the belt according to the ratio of fly ash:ash:raw coal mass ratio of 0.1:0.1:1. The raw coal is ground into coal powder with a particle size of less than 74 μm in a coal mill and dried with h...

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Abstract

The invention discloses a method for regulating and controlling coal quality in a coal gasification process. The method of regulating the coal quality in the coal gasification process is: the raw coal is sent to the coal grinding device to be ground into coal powder and dried, and then sent to the friction charging electrostatic separation device, and the clean coal is obtained from the clean coal collection tank, and the clean coal is sent to the gasification device Reaction, tailing coal is obtained from the tailing coal collection tank, and the tailing coal is recycled and reused or further sorted by a friction-charged electrostatic separation device. When the ash content of the coal powder is less than 8%, the fly ash from the gasification device and the / or ash and raw coal are mixed and sent to the coal grinding device to be ground into coal powder and dried, and then sent to the friction-charged electrostatic separation device for recycling. The invention is suitable for regulating the quality of a single type of coal, has low requirements on the type of coal, has a wide application range, and can significantly improve the stability and economical efficiency of the operation of the coal gasification process.

Description

technical field [0001] The invention relates to a method for regulating coal quality, in particular to a method for regulating coal quality in a coal gasification process. Background technique [0002] Coal is a complex mixture of organics and minerals. The coal ash in the dry pulverized coal gasification process gasifier is in a molten state, and part of the molten minerals are discharged in the form of liquid slag, and the rest is entrained by the synthesis gas and recovered as fly ash. Taking the Shell pulverized coal gasification process as an example, a uniformly distributed slag layer is formed inside the water wall of the gasifier to achieve the goal of "resisting slag with slag" to resist the corrosion of the water wall by high temperature slag. [0003] The stability of coal quality is of great significance to the stable production of coal gasification process. First, there is a need to keep the ash content of the coal stable. If the ash content is high, the gas ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C3/04B03C3/40
Inventor 黄正梁郭健王靖岱周业丰朱子川董克增张擎何乐路蒋斌波廖祖维阳永荣孙婧元王宇良
Owner ZHEJIANG UNIV
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