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Method for producing high-yield tar by pyrolyzing coal

A technology of coal pyrolysis and pyrolysis, which is applied in coking ovens, petroleum industry, special forms of dry distillation, etc. It can solve the problems of low tar yield, unreasonable utilization of low-modified coal, and environmental pollution, etc., and achieve high tar yield , Solve the effect that cannot be used reasonably and reduce the secondary reaction

Active Publication Date: 2013-09-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for coal pyrolysis to produce more tar in order to overcome the disadvantages of low tar yield and environmental pollution in the prior art, and to solve the problem that low metamorphic coal cannot be rationally utilized

Method used

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  • Method for producing high-yield tar by pyrolyzing coal

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Embodiment 1

[0029] Baiyinhua lignite is pulverized and sieved to produce 10-1000μm coal powder, which is sent to the pretreatment room for drying and dehydration, and then sent to the fixed-bed intermittent negative pressure pyrolysis reactor. The pyrolysis temperature is 450°C and the pressure is Under the condition of 10kPa (absolute pressure), the pyrolysis takes 1800 seconds, and the volatile products produced by the reaction, including pyrolysis gas and coal tar, escape under the action of the vacuum pump and enter the oil-gas separator. The pyrolysis gas from the oil-gas separator is cooled and washed to obtain coal gas. After the coke is discharged from the negative pressure pyrolysis reactor, it is cooled and used as a coke product or as a raw material for gasification to produce synthesis or hydrogen. The pyrolysis product yields are shown in Table 2.

Embodiment 2

[0033] By adopting the negative pressure pyrolysis method provided by the present invention, the Baiyinhua lignite is subjected to negative pressure pyrolysis according to the same process as in Example 1. The difference is that the pyrolysis temperature is 400°C and the pressure is 50kPa (absolute pressure). The pyrolysis product yields are shown in Table 2.

Embodiment 3

[0035] By adopting the negative pressure pyrolysis method provided by the present invention, the Baiyinhua lignite is subjected to negative pressure pyrolysis according to the same process as in Example 1. The difference is that the negative pressure pyrolysis reactor adopts a fluidized bed, the pyrolysis temperature is 460° C., the pressure is 80 kPa (absolute pressure), and the pyrolysis time is 60 seconds. The pyrolysis product yields are shown in Table 2.

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Abstract

The invention relates to a method for producing high-yield tar by pyrolyzing coal, which comprises the following steps: pulverizing raw coal, dehydrating, sending the coal into a pyrolysis reactor, and carrying out pyrolytic reaction at 300-600 DEG C under the pressure of 1-90 kPa to generate a volatile matter; removing dust, cooling, and separating to obtain coal tar and a gas product; and moving the coal tar out of the pyrolysis reactor, and carrying out heat-exchange cooling to obtain coke. By treating the coal according to the negative-pressure pyrolysis principle, the invention has the characteristics of high yield of tar and gas, high safety in operation, and outstanding environmental protection effect, and meanwhile solves the problem that low metamorphic coal can not be reasonably utilized.

Description

technical field [0001] The invention relates to a method for obtaining coal tar from coal, more specifically, a method for pyrolyzing coal to produce more tar under the condition of negative pressure or lower than normal pressure. Background technique [0002] In recent years, the world's oil resources have become increasingly scarce and the price of crude oil has remained high. In order to ensure the comprehensive, coordinated and sustainable development of energy, it is necessary to find alternative energy sources for oil. my country is a country rich in coal resources. Therefore, how to convert the abundant and cheap coal resources into liquid products to replace petroleum has become an important development direction for the clean utilization of coal resources. At present, the main ways to convert coal into liquid products include hydrogenation direct liquefaction, indirect liquefaction (gasification-synthesis), pyrolysis, etc. The commercial application of direct lique...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/04
Inventor 王卫平吴治国申海平
Owner CHINA PETROLEUM & CHEM CORP
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