Method for producing tar, semi-coke and synthetic fuel gas by low-degree of coalification powdered coal

A synthetic fuel and low coalification technology, applied in the manufacture of combustible gas, preparation of liquid hydrocarbon mixtures, coke ovens, etc., can solve the problems of low comprehensive thermal efficiency, environmental pollution, and high difficulty in efficient utilization of pulverized coal, and achieve low environmental impact , The effect of less discharge of three wastes

Active Publication Date: 2014-01-08
THE NORTHWEST RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is based on the proportion of energy structure in my country, and is proposed under the current situation that it is difficult to efficiently utilize pulverized coal with low coalification degree, the comprehensive thermal efficiency of traditional treatment methods is low, the yield and quality of synthetic fuel gas and tar are low, and the environment is seriously polluted.

Method used

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  • Method for producing tar, semi-coke and synthetic fuel gas by low-degree of coalification powdered coal
  • Method for producing tar, semi-coke and synthetic fuel gas by low-degree of coalification powdered coal
  • Method for producing tar, semi-coke and synthetic fuel gas by low-degree of coalification powdered coal

Examples

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Embodiment 1

[0108] Example 1: Production of tar, semi-coke and synthetic fuel gas using pulverized coal with low degree of coalification

[0109] The coal quality of the pulverized coal with low coalification degree in northern Shaanxi used in this example was analyzed by the methods stipulated in GB212-91 and GB476-91. The coal quality analysis results are listed in Table 1 below.

[0110] Table 1: Coal quality analysis results, expressed in weight %

[0111]

[0112] Use an industrial sieve with a pore size of 12mm to screen the above-mentioned low-coalification pulverized coal in northern Shaanxi that has been crushed, and return the unscreened large-grained coal to the crusher for crushing until it passes through a 12mm industrial sieve, and collect the sieved pulverized coal for processing Utilization, the overall raw material particle size is freely broken distribution.

[0113] The implementation steps of this embodiment are as attached figure 1 shown. The specific implement...

Embodiment 2

[0122] Example 2: Production of tar, semi-coke and synthetic fuel gas using pulverized coal with low degree of coalification

[0123] The implementation mode of this embodiment is the same as that of Example 1. The low-coalification degree pulverized coal in northern Shaanxi used in Example 1 is added to the airflow dryer 1 through a conveying device at a rate of about 1150 kg / h, and the air flow into the airflow dryer 1 is adjusted. The circulating flue gas flow rate is 1589.83kg / h, and the high-temperature flue gas flow rate reaches 3432.96kg / h (temperature ~ 510°C). The high-temperature flue gas and the raw pulverized coal contact and exchange heat in the airflow dryer. The temperature of the pulverized coal coming out of the airflow dryer 1 is about 180°C, and the free moisture contained therein is reduced to about 1.5% by weight. The raw coal with large particles of about 23kg / h is automatically screened out by the air dryer 1 and then discharged from the bottom of the ai...

Embodiment 3

[0132] Example 3: Production of tar, semi-coke and synthetic fuel gas using pulverized coal with low degree of coalification

[0133] This embodiment uses the same raw materials as in Example 1, and is carried out in the same manner as in Example 1, except that the return synthetic fuel gas is not introduced into the inner cylinder 12 of the partition wall reactor 3, and the wet / dry coke quenching device adopts dry coke quenching way, the high-temperature flue gas sent to the air flow dryer 1 is part of the high-temperature nitrogen gas produced by the dry coke quenching device, the waste heat flue gas discharged from the partition wall reactor 3 and a part of the waste flue gas discharged from the gas-solid separator 2 ( That is, the mixture composed of circulating flue gas), the gas blowback gas of the gas dust collector 4 in this embodiment adopts the high-temperature nitrogen gas produced by the dry coke quenching device.

[0134]Add the pulverized coal with low coalificat...

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Abstract

The invention relates to a method for producing tar, semi-coke and synthetic fuel gas by low-degree of coalification powdered coal. The method comprises the steps of low-degree of coalification powdered coal pre-drying, dry powdered coal separation, low-degree of coalification powdered coal conversion, light gaseous product dedusting, light gaseous product separation and collection, pyrolysis product semi-coke recovery and the like. The method provided by the invention provides a safe and reliable way for realizing efficient utilization of the powdered coal. The method provided by the invention is high in throughput and high in heat exchange efficiency, and can automatically sieve raw material grains, so that load on a coal preparation system is reduced, and yield of a light product is increased. Compared with the prior art, the method provided by the invention has the advantages that inert component content and tar dustiness in the synthetic fuel gas are effectively reduced, heat transfer efficiency and conversion reaction speed are effectively improved, and yield of tar and synthetic fuel gas products is increased, wherein the tar dustiness is less than 0.1mg / kg. The method has the characteristics of low energy consumption and low environment pollution, thereby having very important economic significance and social significance and having a great application prospect.

Description

【Technical field】 [0001] The invention belongs to the technical field of thermal conversion and utilization of pulverized coal. More specifically, the present invention relates to a method for producing high-quality tar, semi-coke and synthetic fuel gas from pulverized coal with a low degree of coalification. 【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 transpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/38C10J3/84C10J3/72C10B53/04C10B57/10C10B57/00C10G1/00
Inventor 贺根良门长贵张勇韦孙昌徐宏伟罗进成郑亚兰王锦葛宁王堰柳
Owner THE NORTHWEST RES INST OF CHEM IND
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