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Low-coalification degree pulverized coal pyrolysis method and product prepared through the same

A low coalification degree, pulverized coal technology, applied in the cooling of coke, combustible gas purification, combustible gas purification/transformation, etc., can solve the problem of low yield and quality of product gas and tar, low heat transfer rate and comprehensive thermal efficiency, gas and low tar yield and quality

Active Publication Date: 2010-11-10
XIAN ORIGIN CHEM TECH
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Problems solved by technology

Although the internal thermal dry distillation technology has the advantages of high heat transfer efficiency and fast heating rate, the outstanding problems are low product quality, such as high dust content in gas and tar, high content of inert components in gas, and a large increase in semi-coke ash content. As a result, it is difficult to use high added value, especially the gas internal heating technology also increases the load on the subsequent product purification and separation system
[0005] At present, the external heating technology mainly includes the multi-stage rotary pyrolysis process (ZL92104624.3) of the Coal Science Research Institute, and the low-temperature dry distillation technology of fine-grained and weakly sticky coal (ZL200610012400.X) developed by Zhang Jiyu et al. and low comprehensive thermal efficiency, low yield and quality of product gas and tar, and in the process of tar recovery, gas cooling, semi-coke cooling, and gas dust removal, a large amount of phenol-containing dust-containing waste water and dust-containing waste gas are generated, causing environmental damage a lot of pollution
[0006] The present invention is based on the proportion of energy structure in our country, aiming at the difficulty of efficient utilization of pulverized coal with low degree of coalification, low comprehensive thermal efficiency of traditional treatment methods, low yield and quality of gas and tar, and serious environmental pollution. A large number of researches and proposed on the basis of the test

Method used

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  • Low-coalification degree pulverized coal pyrolysis method and product prepared through the same

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Embodiment 1

[0083] The method of the present invention is implemented by using pulverized coal with a low degree of coalification in northern Shaanxi.

[0084] The maximum particle size of raw pulverized coal is 12mm, and the average particle size is 8mm. The main coal quality analysis results are described in the table below:

[0085] Table 1: Coal quality analysis results

[0086]

[0087]The specific operating conditions are as follows: the pyrolysis furnace 2 adopts the first structural form, and the pulverized coal with low coalification degree in northern Shaanxi is added to the inner cylinder 46 of the drying furnace 1 through the pipeline 12, and the pyrolysis furnace 2 coming out of the outer cylinder 44 is adjusted. The flow of combustion waste gas heats the pulverized coal in the inner cylinder 46 to 190° C., and the residence time of the pulverized coal with low coalification degree in the drying furnace reaches 30 minutes by adjusting the rotating speed of the hinge 45 in...

Embodiment 2

[0095] Example 2: The method of the present invention is implemented with Inner Mongolia lignite powder as a raw material. The maximum particle size of the raw material is 10mm, and the average particle size is 3mm. The main coal quality analysis data are as described in Table 3.

[0096] Table 3: Analysis data of lignite coal quality in Inner Mongolia

[0097]

[0098] The specific operating conditions are as follows: the method of this embodiment is the same as the process of Example 1, except that the pyrolysis furnace 2 adopts the second structural form, the operating process conditions of the drying furnace 1 and the pyrolysis furnace 2 are different, and the semi-coke cooling furnace 3 is removed, and the The raw coal types are different. Inner Mongolia lignite powder enters the inner cylinder 46 of the drying furnace 1 through the pipeline 12, and the pulverized coal in the inner cylinder 46 is heated to 140°C by adjusting the flow rate of the drying medium in the ou...

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Abstract

The invention relates to a low-coalification degree pulverized coal pyrolysis method and a product prepared through the same. The method comprises the following four steps: low-coalification degree pulverized coal pre-drying, low-coalification degree pulverized coal pyrolysis reaction, gas cooling and tar recovery, and hot semi-coke cooling. The method is applicable to heat treatment to low-coalification degree pulverized coal resources so as to obtain high-quality pyrolysis gas and tar products, wherein the gas contains low inert component content, tar contains high light component content and low dust content, and semi-coke products with wide purposes are obtained. The process method is characterized by high comprehensive utilization rate of energy, large amount of treated material, lowdevice investment, easy industrialization realization, environmental friendliness and the like while improving the raw material utilization efficiency.

Description

【Technical field】 [0001] The invention relates to the technical field of pulverized coal heat treatment, more specifically, the invention relates to a method for pyrolysis of pulverized coal with a low degree of coalification, and products obtained by the method. 【Background technique】 [0002] In the proportion of my country's energy structure, the reserves and consumption of coal resources account for more than 70% of the total primary energy. With the further shortage of oil, natural gas and other resources, coal will become the main body of my country's energy structure for a long time . Among the total coal resources in my country, the proven reserves of low-coalification coal (such as lignite, long-flame coal, non-caking coal, and weakly caking coal) account for more than 30%, mainly distributed in Inner Mongolia, Shaanxi, Yunnan and other places. A large amount of pulverized coal will be produced during mining and transportation. This pulverized coal resource has defec...

Claims

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Application Information

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IPC IPC(8): C10B53/04C10B57/10C10K1/04C10K1/10C10K1/00C10B39/00
Inventor 贺根良门长贵张勇韦孙昌樊义龙徐宏伟徐红东葛宁王锦罗进成
Owner XIAN ORIGIN CHEM TECH
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