Method and device for preparing semi-coke

A semi-coke and hot semi-coke technology, applied in the field of semi-coke preparation, can solve the problems affecting the long-term stable operation of the pyrolysis system, low tar yield, large amount of powder coke, etc., and achieves improved quality and reduced powder coke amount. , the effect of high proportion of combustible components

Active Publication Date: 2016-02-03
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the defects that the large amount of fine coke produced in the pyrolysis process of low-rank coal affects the...

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  • Method and device for preparing semi-coke
  • Method and device for preparing semi-coke
  • Method and device for preparing semi-coke

Examples

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Effect test

Embodiment 1

[0059] This example is used to illustrate the method for preparing semi-coke of the present invention.

[0060] (1) dry. Put the Hulunbuir coal with a particle size of <30mm into the vertical drying furnace for drying. The final drying temperature is 180°C, and the drying time is 2.5 hours to obtain dry coal;

[0061](2) Co-pyrolysis. The obtained dry coal, liquid coal liquefaction residue (the coal liquefaction residue comes from the direct coal liquefaction production plant, see Table 2 and 3 for the analysis data) and circulating hot semi-coke, according to the weight ratio of the liquid coal liquefaction residue to the dry coal is 15:100, the weight ratio of circulating hot semi-coke to dry coal is 2.5:1, put into the pyrolysis furnace for co-pyrolysis. The temperature of the liquid coal liquefaction residue is 220°C, and the temperature of the circulating hot semi-coke is 450°C. The temperature of the feed section of the pyrolysis furnace was 330°C. A thermal annular...

Embodiment 2

[0079] This example is used to illustrate the method for preparing semi-coke of the present invention.

[0080] (1) dry. After the Shendong coal is crushed by a crusher to a particle size below 30mm, it is added to a vertical drying furnace for drying. The final drying temperature is 200°C, and the drying time is 1.0h to obtain dry coal;

[0081] (2) Co-pyrolysis. The obtained dry coal, liquid coal liquefaction residue and recycled hot semi-coke are calculated according to the weight ratio of liquid coal liquefaction residue to dry coal is 15:100, and the weight ratio of recycled hot semi-coke to dry coal is 2:1 , into the pyrolysis furnace for co-pyrolysis. The temperature of the liquid coal liquefaction residue is 240°C, and the temperature of the circulating semi-coke is 480°C. The temperature of the feed section of the pyrolysis furnace was 340°C. A thermal annular coil is arranged at the discharge section of the pyrolysis furnace, and the combustion exhaust gas disch...

Embodiment 3

[0089] This example is used to illustrate the method for preparing semi-coke of the present invention.

[0090] (1) dry. After the Hulunbuir coal is crushed by a crusher to a particle size of less than 30mm, it is added to a vertical drying furnace for drying. The final drying temperature is 160°C, and the drying time is 3 hours to obtain dry coal;

[0091] (2) Co-pyrolysis. The obtained dry coal, liquid coal liquefaction residue and circulating hot semi-coke are calculated according to the weight ratio of circulating hot semi-coke to dry coal is 3:1, and the weight ratio of liquid coal liquefaction residue to dry coal is 25:100 , into the pyrolysis furnace for co-pyrolysis. The temperature of the liquid coal liquefaction residue is 210°C, and the temperature of the circulating hot semi-coke is 430°C. The temperature of the feed section of the pyrolysis furnace was 320 °C. A thermal annular coil is arranged at the discharge section of the pyrolysis furnace, and the combus...

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Abstract

The invention discloses a method and a device for preparing semi-coke. The method comprises the following steps: under the condition of co-pyrolysis reaction, mixing hot liquefied residues with dry coal, and carrying out co-pyrolysis so as to obtain hot semi-coke and pyrolysis gas, wherein the liquefied residues are substances generated by direct liquefaction of coal, and the temperature of the co-pyrolysis is 450 to 650 DEG C. The method provided by the invention can reduce the content of powder coke generated in the process of preparing the semi-coke, thereby increasing long-period stable operation of a pyrolysis system; meanwhile, obtained coal gas and tar have high yield and good quality.

Description

technical field [0001] The invention relates to a method and a device for preparing semi-coke. Background technique [0002] In my country's Yunnan, Inner Mongolia, Northeast, Xinjiang and other places, there are a large amount of low-rank coal including lignite, and its reserves account for more than 40% of the total coal. The main characteristics of low-rank coal are high water content, low calorific value, and high volatile matter, which are not suitable for long-distance transportation and utilization. These characteristics greatly restrict the development and utilization of low-rank coal, especially lignite. At present, one of the methods for upgrading and utilizing low-rank coal is coal drying, that is, drying raw coal by direct or indirect heating, removing 60-90% of its moisture, and obtaining dry coal with high calorific value . The second method to upgrade and utilize low-rank coal is to pyrolyze coal to obtain semi-coke with extremely low moisture content, high ...

Claims

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Application Information

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IPC IPC(8): C10B53/00C10B49/02C10B57/10C10B57/00
CPCY02P20/129
Inventor 陈爱国门卓武李初福翁力郭屹刘科
Owner CHNA ENERGY INVESTMENT CORP LTD
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