Coal pyrolysis and gasification combined production method

A technology of joint production and coal pyrolysis, applied in the field of coal gasification, can solve problems such as low carbon conversion rate, and achieve the effects of improving carbon conversion rate, system optimization, and solving ash discharge problems

Active Publication Date: 2017-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a joint production method of coal pyrolysis and gasification in order to overcome the defect of low carbon conversion rate in the existing coal pyrolysis-fluidized bed gasification polygeneration process

Method used

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Experimental program
Comparison scheme
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Embodiment approach

[0052] According to a preferred embodiment of the present invention, the process flow chart of the joint production method of coal pyrolysis and gasification is as follows figure 1 shown. Specifically, the joint production method of coal pyrolysis and gasification includes:

[0053] (1) Grinding the raw coal 11 to below 6 mm, and separating it into coarse coal powder 12 and fine coal powder 13;

[0054] (2) Coarse pulverized coal 12 is injected into the fluidized bed pyrolysis furnace 1 for pyrolysis, and superheated steam 14 and optionally product gas 22 from the subsequent fluidized bed gasification furnace 2 are heated from the fluidized bed The bottom of the pyrolysis furnace 1 is injected as a part of the heat source and fluidization gas, and at the same time, the high-temperature semi-coke 15 from the subsequent fluidized bed gasification furnace 2 is injected from the middle of the fluidized bed pyrolysis furnace 1 as another part of the heat source. The outlet gas te...

Embodiment 1

[0066] This example is used to illustrate the joint production method of coal pyrolysis and gasification provided by the present invention.

[0067] Such as figure 1As shown, the raw coal is ground by a coal mill and sieved to obtain coarse coal powder with a particle size of 0.15-3 mm and fine coal powder with a particle size of less than 0.15 mm. The coarse coal powder is injected into the fluidized bed pyrolysis furnace 1 at 30 kg / h for pyrolysis, the operating temperature is 550° C., and the operating pressure is 0.1 MPa. The heat required by the pyrolysis furnace mainly comes from the high-temperature semi-coke (950°C) of the fluidized bed gasifier 2, and part of the product gas (950°C) from the fluidized bed gasifier 2 is injected into the pyrolysis furnace 1 to make the heat The furnace 1 realizes fluidized operation. The outlet temperature of the pyrolysis furnace is 450°C, and the coal tar carried in it is separated from the pyrolysis gas after being washed with wat...

Embodiment 2

[0079] This example is used to illustrate the joint production method of coal pyrolysis and gasification provided by the present invention.

[0080] Such as figure 1 As shown, the raw coal is ground by a coal mill and sieved to obtain coarse coal powder with a particle size of 0.15-3 mm and fine coal powder with a particle size of less than 0.15 mm. The coarse coal powder is injected into the fluidized bed pyrolysis furnace 1 at 30 kg / h for pyrolysis, the operating temperature is 600° C., and the operating pressure is 1.2 MPa. The heat required by the pyrolysis furnace mainly comes from the high-temperature semi-coke (980°C) of the fluidized bed gasifier 2, and part of the product gas (980°C) from the fluidized bed gasifier 2 is injected into the pyrolysis furnace 1 to make the heat The furnace 1 realizes fluidized operation. The outlet temperature of the pyrolysis furnace is 500°C, and the coal tar carried in it is separated from the pyrolysis gas after being washed with wa...

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Abstract

The invention relates to a joint production method of coal pyrolysis and gasification, the method comprising: (1) separating coarse coal powder and fine coal powder from raw coal; (2) separating the coarse coal powder in a fluidized bed (3) Gasify the semi-coke produced by pyrolysis in a fluidized bed to obtain a gas stream and high-temperature semi-coke, which are separated from the gas stream product gas and solid particles, and at least part of the high-temperature semi-coke and / or at least part of the product gas are returned to the pyrolysis process as a heat source for the pyrolysis process; (4) the separated in step (1) The fine coal powder and the solid particles separated in step (3) are subjected to pulverized coal gasification. The joint production method of coal pyrolysis and gasification provided by the present invention realizes the joint supply of heat, gas, oil and chemicals, and obtains a higher carbon conversion rate.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a joint production method of coal pyrolysis and gasification. Background technique [0002] In 2013, domestic primary energy consumption reached a new high, reaching 3.76 billion tons of standard coal. However, my country's foreign dependence on crude oil has reached 58.1%, and the foreign dependence on natural gas has exceeded 30% for the first time and reached 31.6%. The energy security situation is becoming increasingly severe. The total amount of coal resources in my country is abundant, about 5.9 trillion tons, and the predicted resources are 3.88 trillion tons. Therefore, making good use of the huge coal reserves and turning them into resources and strategies, and vigorously developing modern coal chemical technology can effectively alleviate the upward pressure of primary energy's external dependence. [0003] The proportion of low-rank coal in my country's coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/60C10J3/54C10B53/04
Inventor 吴治国王蕴王鹏飞王航王卫平崔龙鹏任杰
Owner CHINA PETROLEUM & CHEM CORP
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