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A coal gasification method

A coal gasification and gasification furnace technology, applied in the field of coal gasification, can solve problems such as high content, unfavorable hydrogen, and hidden safety hazards in subsequent sections, and achieve good flow characteristics, reduce vibration, and reduce impact

Active Publication Date: 2016-09-14
铜陵市世纪朝阳数码科技有限责任公司
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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...

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 present invention provides an gasification method. The specific preparation steps include: coal grinding and drying, grouped coal pressing and transportation, and gasification stove gas.In the selection of the coal mill, the present invention puts out the hot air furnace into the wind distribution of the coal mill, and at the same time ensure that the hot air temperature of the coal milling machine is not greater than the conversion temperature of lignite, and the local surface of the lignite is not overTemperature, reduce the emergence of waves in lignite; the present invention uses high volatile lignite as the raw material to control the coal mill system, and the oxygen concentration is maximum of 4%.Increase the import of nitrogen in the system, reduce the impact on the stick of the stick, and reduce the vibration of the coal mill; the combustion temperature in the gasification furnace of the present invention is 150 to 200 ° C than the ash flowing temperature.Under this temperature and pressure, not only can the conversion rate in the furnace reaches 99%, but the ash slag has a good flow characteristics.

Description

technical field [0001] The invention relates to a 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-enriched conti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/48C10J3/50C10J3/84C10J3/72
CPCC10J3/48C10J3/50C10J3/723C10J3/84C10J2300/0906C10J2300/0909C10J2300/0936C10J2300/1615
Inventor 李程伟
Owner 铜陵市世纪朝阳数码科技有限责任公司
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