Device and method for improving tar yield by pyrolysis of low-rank coal

A technology of tar yield and low-rank coal, which is applied in the field of devices to increase the yield of low-rank coal pyrolysis tar, can solve the problems of low cost, low tar yield, incomplete recovery of coal pyrolysis tar, etc., and achieve an increase in production efficiency, reducing coal pyrolysis temperature, and reducing the possibility of secondary reactions

Active Publication Date: 2016-02-03
NORTHWEST UNIV(CN)
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  • Claims
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Problems solved by technology

[0008] In order to overcome the problems in the prior art, the purpose of the present invention is to provide a device and method for improving the yield of low-rank coal pyrolysis tar, the method is low in cost, and the yield of coal pyrolysis tar is as high as 9.6%, which overcomes the Technical problems such as low tar yield and incomplete coal pyrolysis tar recovery in the existing coal pyrolysis conversion process

Method used

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  • Device and method for improving tar yield by pyrolysis of low-rank coal
  • Device and method for improving tar yield by pyrolysis of low-rank coal
  • Device and method for improving tar yield by pyrolysis of low-rank coal

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Embodiment 1

[0053] Put 0-0.2mm pulverized coal into the external heating type pyrolysis furnace (electric heating), raise the temperature to 600°C at a certain heating rate at room temperature (a certain amount of nitrogen gas is introduced into the gas distributor at the bottom of the heating furnace), and maintain a certain Time: While adding pulverized coal, feed circulating cooling water into the snake pipes in the first tar condensation tower and the second tar condensation tower, do not open the vacuum pump, and the pressure in the process is normal pressure. When the reaction is finished, measure and calculate the yield of pyrolysis semi-coke, tar, pyrolysis water and pyrolysis gas (see Figure 5 ). The tar that test obtains carries out gas chromatography-mass spectrometry analysis (results see Figure 6 and Figure 7 ).

Embodiment 2

[0055] The present invention provides a method for increasing the yield of low-rank coal pyrolysis coal tar. According to the same process as that of Example 1, the pyrolysis test and tar recovery are carried out on the coal of the same raw material. The difference is that the vacuum needs to be turned on, and the pressure is controlled to 80kPa, 60kPa, 40kPa and 20kPa respectively, and 4 tests are carried out respectively. After the test, the yields of pyrolysis semi-coke, tar, pyrolysis water and pyrolysis gas were measured and calculated (see Figure 5 ). The tar that test obtains carries out gas chromatography-mass spectrometry analysis (results see Figure 6 and Figure 7 ).

[0056] Depend on Figure 5 It can be seen that with the reduction of the pressure in the pyrolysis process and under the pyrolysis conditions with the presence of purge gas, the pyrolysis tar yield gradually increased. % tar yield increased more. Depend on Figure 6 and Figure 7 It can be s...

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Abstract

The invention provides a device and a method for improving tar yield by pyrolysis of low-rank coal. The device comprises a pyrolysis furnace, a cyclone separator, a first tar condensing tower, a second tar condensing tower and a vacuum pump which are sequentially connected from left to right, wherein the top of the pyrolysis furnace is provided with a coal hopper, a plurality of furnace walls are arranged in the pyrolysis furnace, a spiral tar remover is arranged between adjacent furnace walls, a pyrolysis gas inlet is formed in one side of the bottom of the first tar condensing tower, a tar collecting slot is formed right below the bottom of the first tar condensing tower, and a pyrolysis gas outlet is formed in the other side of the bottom of the first tar condensing tower. Under the conditions of negative pressure and pyrolysis of sweeping gas, along with the reducing of pressure in the pyrolysis process, the tar yield is increased, and the proportion of acid compounds (mainly phenolic compounds) in the components of coal tar is increased. The yield of the coal tar in the coal pyrolysis process can be obviously increased, and coal pyrolysis temperature is reduced. Meanwhile, the possibility of secondary reaction of the separated-out coal tar in the pyrolysis process is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and relates to a device and a method for increasing the yield of low-order coal pyrolysis tar. Background technique [0002] While the industrialization of coal-to-liquids (direct and indirect liquefaction) in China has been realized, the low-temperature pyrolysis / semi-coke industrialization of high-volatility and low-metamorphism coal in Shaanxi, Inner Mongolia and Xinjiang has developed rapidly and is in the ascendant. Coal can be pyrolyzed to obtain coke oven gas, coal tar, semi-coke or coke. According to preliminary estimates, the total production capacity of medium and low temperature coal tar in my country is about 8 million tons per year. Coal tar is a very valuable organic chemical raw material. In addition to the production of high value-added products such as carbazole and quinoline, it can also be hydrogenated to produce fuel oil (Yulin, Shaanxi Province produces coal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10B57/18C10B57/00
Inventor 孙鸣马晓迅吕波苏小平徐龙
Owner NORTHWEST UNIV(CN)
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