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A coal gasification method

A technology of coal gasification and gasification furnace, which is applied in the field of coal chemical industry, can solve the problems of unfavorable hydrogen, high content, high cost of oxygen production, etc., and achieve the effect of reducing vibration, increasing inlet and reducing escape

Active Publication Date: 2016-08-17
海鑫电力设备制造(南通)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The oxygen used in this process requires the construction of an air separation unit, which requires high investment and high cost of oxygen production. This is the main reason for restricting the development of continuous oxygen-enriched gasification and the fact that small and medium-sized synthetic ammonia plants use this process.
[0005] (2) The composition of oxygen-enriched continuous gasification gas is poor, with carbon dioxide content as high as 15-20%, methane content as high as 2%, and the gas contains organic substances such as benzene and naphthalene
Bring great problems to the follow-up section
Especially the problem of methane and organic matter, there is no good solution at present
[0006] (3) It is difficult to control the oxygen content in the oxygen-enriched continuous gasification gas composition, which brings safety hazards to the subsequent sections
[0010] The gasifier adopts a water-cooled wall structure, and its disadvantage is that the CH in the syngas 4 The content is high, which is unfavorable for the production of ammonia, methanol and hydrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A coal gasification method, the specific preparation steps are as follows:

[0029] (1) Coal grinding and drying unit

[0030] After the lignite with particle size ≤ 30mm is pre-dried, the broken lignite particle size is less than 15mm. The above-mentioned pre-dried lignite is lifted to a height of 45 meters through the bucket elevator, and enters the raw material coal storage of the gasification device through the closed coal delivery trestle under the protection of nitrogen. The warehouse, under the action of gravity, enters the coal mill through the coal feeder and grinds it into powder. The primary air from the hot blast stove enters the coal mill in a circular distribution, and at the same time controls the flow of the primary air entering the coal mill. The temperature is not higher than the conversion temperature of lignite. Control the temperature of the inert airflow generated by the inert gas generator when it enters the coal mill inlet to about 150°C, and the...

Embodiment 2

[0039] A coal gasification method, the specific preparation steps are as follows:

[0040] (1) Coal grinding and drying unit

[0041] After the lignite with particle size ≤ 30mm is pre-dried, the broken lignite particle size is less than 15mm. The above-mentioned pre-dried lignite is lifted to a height of 45 meters through the bucket elevator, and enters the raw material coal storage of the gasification device through the closed coal delivery trestle under the protection of nitrogen. The warehouse, under the action of gravity, enters the coal mill through the coal feeder and grinds it into powder. The primary air from the hot blast stove enters the coal mill in a circular distribution, and at the same time controls the flow of the primary air entering the coal mill. The temperature is not higher than the conversion temperature of lignite. Control the temperature of the inert airflow generated by the inert gas generator when it enters the coal mill inlet to about 200°C, and the t...

Embodiment 3

[0050] A coal gasification method, the specific preparation steps are as follows:

[0051] (1) Coal grinding and drying unit

[0052] After the lignite with particle size ≤ 30mm is pre-dried, the broken lignite particle size is less than 15mm. The above-mentioned pre-dried lignite is lifted to a height of 45 meters through the bucket elevator, and enters the raw material coal storage of the gasification device through the closed coal delivery trestle under the protection of nitrogen. The warehouse, under the action of gravity, enters the coal mill through the coal feeder and grinds it into powder. The primary air from the hot blast stove enters the coal mill in a circular distribution, and at the same time controls the flow of the primary air entering the coal mill. The temperature is not higher than the conversion temperature of lignite. Control the temperature of the inert airflow generated by the inert gas generator when it enters the coal mill inlet to about 250°C, and the...

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Abstract

The invention provides an efficient coal gasification method, and the specific preparation steps include: coal grinding and drying, pulverized coal pressurization and transportation, and gasification furnace gasification. In the type selection of the coal mill, the present invention distributes the primary air from the hot blast stove into the coal mill in a ring shape, and at the same time ensures that the temperature of the hot air entering the coal mill is not greater than the conversion temperature of the lignite, and ensures that the local surface of the lignite does not exceed temperature, reducing the escape of volatile components in lignite; the present invention uses high-volatile lignite as raw material, controls the coal grinding system, and the maximum oxygen concentration is 4%, and a new low-pressure nitrogen gas is added to the coal grinding machine sealing system in the system, and at the same time Increase the nitrogen inlet in the system, reduce the impact on the grinding rod, and reduce the vibration of the coal mill; the program in the present invention will start the lock hopper unloading cycle, and the total unloading cycle time is 3 minutes. It can be seen that the whole process has a high degree of automation and high efficiency. High and short.

Description

technical field [0001] The invention relates to an efficient coal gasification method, which belongs to the field of coal chemical industry. Background technique [0002] Coal is an abundant resource. Coal gasification is an efficient and clean coal utilization method. Coal gasification technologies commonly used today include oxygen-enriched continuous gasification, fluidized bed gasification, and two-stage pressurized gasification of dry pulverized coal. But above-mentioned technology all has defect. [0003] Oxygen-enriched continuous gasification has the following disadvantages: [0004] (1) The oxygen used in this process requires the construction of an air separation unit, which requires high investment and high cost of oxygen production. This is the most important reason for restricting the development of continuous oxygen-enriched gasification and the small and medium-sized synthetic ammonia plants adopting this process. [0005] (2) The composition of oxygen-enr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/46C10J3/84C10J3/50
CPCC10J3/46C10J3/50C10J3/84C10J2200/15C10J2200/152C10J2300/0906C10J2300/0933C10J2300/0976C10J2300/1603C10J2300/1615
Inventor 李程伟
Owner 海鑫电力设备制造(南通)有限公司
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