Kerosene co-catalytic pyrolysis-semicoke catalytic gasification method

A technology of co-catalysis and kerosene, applied in the field of coal pyrolysis, to achieve the effects of simple production process, improved gasification efficiency and high-efficiency pyrolysis

Pending Publication Date: 2021-08-06
XIJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method of kerosene co-catalytic pyrolysis-semi-coke catalytic gasification, which solves the problem of rapid pyrolysis of pulverized coal in the prior art, and uses coal high temperature swelling / decomposition + in-situ catalytic pyrolysis + negative The pressure-pulling head strengthens the pyrolysis process and couples the gasification of semi-coke rich in catalyst, which improves the yield and quality of pyrolysis tar, reduces the gasification temperature of semi-coke, and improves the gasification efficiency of semi-coke

Method used

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Effect test

Embodiment 1

[0024] A method for kerosene co-catalytic pyrolysis-semi-coke catalytic gasification, the method comprising:

[0025] The coal sample is crushed into coal powder with a particle size of 1-1000 μm. The coal sample is mixed with lignite, hematite, medium and low temperature coal tar and coal powder at a mass ratio of 0.2:30:100 to obtain a kerosene slurry. The heater is preheated to 300°C, and then enters the flash pyrolyzer for reaction, the pressure is kept at 1kPa, and the residence time is 1h, so that the volatile matter of kerosene co-pyrolysis can fully escape, and the volatile matter of kerosene slurry flash pyrolysis enters the tar In the separator; after the volatile matter escapes from the flash pyrolysis of the kerosene slurry, the remaining components are polycondensed by the flash pyrolyzer to obtain solid semi-coke, which is broken and sent to the gasifier. 10°C / min to heat up to 900-1200°C, with CO 2 as a gasification agent to obtain syngas CO and H 2 ; Through ...

Embodiment 2

[0028] A method for co-catalyzed pyrolysis of kerosene-semi-coke catalytic gasification is basically the same as in Example 1, the difference is that the raw materials are bituminous coal, laterite nickel ore and high-temperature coal tar, and the quality of laterite nickel ore, high-temperature coal tar and coal powder The ratio is 0.1:100:100, and the residence time in the flash pyrolyzer is 0.3h.

[0029] By comparing the two raw materials (without adding catalyst), the theoretically calculated value of the pyrolysis tar yield is 4.34% higher than the calculated value, and the n-hexane soluble matter is 3.86% higher than the calculated value.

Embodiment 3

[0031] A method for kerosene co-catalytic pyrolysis-semi-coke catalytic gasification is basically the same as in Example 1, the difference being that the raw materials are lignite, hematite and petroleum crude oil, and the mass ratio of hematite, petroleum crude oil and pulverized coal is 0.5:50:100, the preheater is preheated to 350°C, and the residence time in the flash pyrolyzer is 0.1h.

[0032] The tar is collected in the tar collection tank at the front of the vacuum system, and the tar is dehydrated to calculate the yield. By comparing the two raw materials (without adding catalyst), the theoretically calculated value of the pyrolysis tar yield is 2.37% higher than the calculated value, and the n-hexane soluble matter is 4.05% higher than the calculated value. From 40 to 1200°C, with a heating rate of 10°C / min, with CO 2 As a gasification agent, it is found that the maximum and constant peak temperature of the gasification decreases by 23°C through the gasification of ...

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Abstract

The invention discloses a kerosene co-catalytic pyrolysis-semicoke catalytic gasification method which comprises the following steps: mixing low-rank coal, oil and a catalyst to obtain kerosene slurry, preheating the kerosene slurry to 300-500 DEG C, feeding the preheated kerosene slurry into a flash pyrolysis device, maintaining the pressure of the flash pyrolysis device at 0.5-60kPa, and feeding volatile components generated by flash pyrolysis of the kerosene slurry into a tar separator; after volatile components obtained by flash evaporation and pyrolysis of the kerosene slurry escape, carrying out condensation polymerization on residual components through a flash evaporation and pyrolysis device to obtain solid semi-coke, crushing the solid semi-coke to 1-200 meshes, feeding the crushed solid semi-coke to a gasification furnace, heating the crushed solid semi-coke to 900-1200 DEG C at a speed of 10 DEG C/min in the gasification furnace, and taking CO2 as a gasification agent to obtain synthesis gas CO and H2; and condensing and separating volatile components obtained by flash evaporation and pyrolysis of the kerosene slurry through a tar separator to obtain light tar and high-calorific-value coal gas. According to the method disclosed by the invention, the yield and the quality of the pyrolysis tar are improved, meanwhile, the gasification temperature of the semicoke is reduced, and the gasification efficiency of the semicoke is improved.

Description

technical field [0001] The invention relates to coal pyrolysis technology, in particular to a method for kerosene co-catalytic pyrolysis-semi-coke catalytic gasification. Background technique [0002] Low-rank coal (sub-bituminous coal, lignite) is a coal with great chemical processing and utilization value, and the pyrolysis volatile contained in it is equivalent to 300 billion tons of oil and gas resources. Coal pyrolysis is a process in which coal is thermally decomposed into gaseous dry distillation gas, liquid coal tar and solid coke (or semi-coke) at a certain temperature, and it is also the necessary and initial reaction for almost all coal thermal conversion methods stage. Compared with the direct liquefaction and indirect liquefaction of coal, coal pyrolysis has high thermal efficiency, not only low investment and low production cost, but also can extend the coal chemical industry chain, promote product diversification, realize high added value of products, and enr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/64C10J3/72C10J3/84
CPCC10J3/64C10J3/723C10J3/84C10J2300/093C10J2300/0983C10J2300/0986C10J2300/0969
Inventor 么秋香孙鸣李嘉林田少鹏任花萍葛英凯
Owner XIJING UNIV
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