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A method for preparing synthesis gas from coal-water slurry

A technology for coal-water slurry and synthesis gas, which is applied in gasification process, granular/powder fuel gasification, petroleum industry, etc., can solve the problems of high nitrogen content, lower energy density, lower calorific value of crude gas, etc. Achieving the effect of high quality and less impurities

Active Publication Date: 2022-08-09
浙江天禄环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because CO2 cannot be combusted, it is an ineffective gas, and because of aerobic combustion, the nitrogen content in the crude gas is too high, which reduces the H2 and CO in the crude gas Energy density reduces the calorific value of the crude gas. In addition to returning to the furnace for combustion, the crude gas produced by pyrolysis is difficult to have other economic value
Moreover, since the existing low-rank coal and upgraded coal synthesis gas is aerobic pyrolysis, the carbon-hydrogen ratio in the synthesis gas obtained from low-rank coal and upgraded coal is low, so that the final chemical products obtained from the synthesis gas The amount of coal is very small, which greatly wastes the effective coal resources in low-rank coal, and the utilization rate of low-rank coal is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0030] A method for preparing synthesis gas from coal-water slurry, comprising crushing and grinding steps to prepare coal-water slurry, the coal-water slurry is heated to 800-1300 DEG C under anaerobic or micro-oxygen conditions to prepare Contains CO and H 2 of syngas.

[0031] In Example 1, the low-rank coal adopts pulverized coal with a particle size of less than 20 mm;

[0032] In Example 1, the slurry rate of the coal-water slurry is not less than 55%, specifically 58%. The coal-water slurry is sprayed from the top in the gasifier, and heated to 800-1300°C during the falling process. , specifically, about 1000 °C, so that the coal in the CWS reacts with water vapor to generate CO and H 2 .

experiment example 2

[0034] Experiment 2 refers to Experiment 1, except that in Experiment 2, under anaerobic or micro-oxygen conditions, the coal-water slurry is heated by resistance wire to prepare syngas at a temperature of 800-1300°C. Specifically, the low-rank coal in the coal-water slurry is made to react with steam at a temperature of about 1000° C. to obtain synthesis gas.

experiment example 3

[0036] Experimental Example 3 refers to Experimental Example 1, except that in Experimental Example 3, the coal-water slurry flows through an electrode, and a voltage over 10KV is applied to the electrode, so that the particles of the coal-water slurry are charged. The purpose is to allow sufficient time for the water vapor to adhere to the low-rank coal particles and the internal gaps in the process of preparing the synthesis gas, which is beneficial to the generation of the synthesis gas.

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PUM

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Abstract

The invention discloses a method for preparing synthesis gas from coal-water slurry. The coal-water slurry is prepared by including crushing and grinding steps from low-rank coal or upgraded coal. The coal-water slurry is heated to 800‑1300℃, prepared to contain CO and H 2 of syngas. In the method of the present invention, low-rank coal is prepared by including crushing and grinding steps to obtain coal-water slurry, and then gasified and reduced under anaerobic or micro-oxygen conditions to prepare a mixture containing CO and H 2 The synthetic gas prepared by the method has few impurities and high quality, fully and effectively utilizes the coal substance in the low-rank coal, and conforms to the national comprehensive utilization direction of coal.

Description

technical field [0001] The invention relates to the technical field of clean utilization of coal substances, in particular to a method for preparing synthesis gas from coal-water slurry. Background technique [0002] my country is a country rich in coal, poor in oil and little in gas. Coal consumption accounts for more than 60% of primary energy consumption, which determines that the coal-dominated energy structure will be difficult to change for a long time. Judging from the proven quality of coal mines, the proportion of low-rank coal in my country's coal is very large, so it is particularly important to use medium and low-rank coal reasonably and efficiently to produce high-quality chemical products. In recent years, with the continuous development of technologies such as coal gasification, coal pyrolysis, gas purification and gas separation, more and more attention has been paid to the clean and efficient utilization of medium and low rank coal. [0003] Many middle and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/46
CPCC10J3/46C10J2300/0976
Inventor 彭绪亚俞天明陈锋江吕彬峰邱一鑫李荣辉
Owner 浙江天禄环境科技有限公司