A medium and low rank coal pyrolysis gasification system and its application

A technology for pyrolysis, gasification, and low-rank coal, applied in the coal chemical industry, can solve the problems of low dust removal efficiency of the first-stage cyclone dust collector, complicated tar treatment process, blockage of pipes and equipment, etc., so as to reduce the burden of dust removal and avoid equipment Corrosion, the effect of avoiding corrosion

Active Publication Date: 2017-09-12
北京恒丰亚业科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the current pyrolysis-gasification, pyrolysis-combustion and other low-rank coal polygeneration process systems, because the dust removal efficiency of the first-stage cyclone dust collector is not high, the amount of dust in the coal pyrolysis gas is large, and the quality of tar is not high, resulting in subsequent The tar treatment process is complicated, and in the subsequent condensation process, the pipeline and equipment are blocked due to tar dust. The purpose of this invention is to propose a medium and low rank coal pyrolysis gasification system

Method used

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  • A medium and low rank coal pyrolysis gasification system and its application
  • A medium and low rank coal pyrolysis gasification system and its application
  • A medium and low rank coal pyrolysis gasification system and its application

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Effect test

Embodiment 1

[0038] See figure 1 , medium and low-rank coal pyrolysis gasification system, including pyrolysis reactor 5, first cyclone separator 8, first cross-type particle moving bed 10, gasification reactor 13, second cyclone separator 14 and second Traversing particle moving bed 15; Raw coal is extracted from bunker 1 by bucket elevator 2, crushed by crusher 3, and transported to pyrolysis reactor 5 by feeding screw 4.

[0039] The pyrolysis reactor 5 is provided with a medium and low-rank coal inlet and a synthesis gas inlet 6. The gas discharge pipe on the upper part of the pyrolysis reactor 5 is connected to the inlet pipe of the first cyclone separator 8, and the gas outlet at the top of the first cyclone separator 8 is connected to The first cross-type particle moving bed 10, the coal pyrolysis gas is dedusted by the first cyclone separator and desulfurized by the first cross-type particle moving bed to obtain net pyrolysis gas, and the obtained net pyrolysis gas is obtained by p...

Embodiment 2

[0053] In the system of this embodiment, the pyrolysis reactor is a regenerative rotary furnace (moving bed), and a synthesis gas inlet is arranged on the pyrolysis reactor; the bottom of the pyrolysis reactor is provided with a hot semi-coke discharge spiral, and the The hot semi-coke discharge screw is connected with the semi-coke inlets on the walls of the first descending bed and the second descending bed.

[0054] Other settings of the system are the same as in Embodiment 1.

[0055] Using the system of this embodiment, the composition of long-flame coal is shown in Table 2.

[0056] Table 2: Long flame coal composition

[0057]

[0058] Coal pyrolysis gasification includes steps:

[0059] 1) Medium and low-rank coal enters pyrolysis reactor 5 after crushing, and the pyrolysis temperature is controlled at 700°C. Semi-coke and pyrolysis oil and gas are produced by pyrolysis in the pyrolysis reactor. After dedusting and desulfurization in the moving bed, ash-free and ...

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Abstract

The invention provides a medium / low-grade coal pyrolysis gasification system which comprises a pyrolysis reactor, a first cyclone separator, a first cross grain moving bed, a gasification reactor, a second cyclone separator and a second cross grain moving bed, wherein the pyrolysis reactor is provided with a synthetic gas inlet; a gas outlet pipeline on the upper part of the pyrolysis reactor is connected with a gas inlet pipe of the first cyclone separator; the bottom of the pyrolysis reactor is connected with a first burning semicoke screw and a hot-state semicoke discharge screw; the first burning semicoke screw is connected with the gasification reactor; and the hot-state semicoke discharge screw is divided into two paths which are respectively connected to material inlets of the first and second cross grain moving beds. The system performs primary cyclone dedusting and secondary cross grain moving bed dedusting on the coal pyrolysis gas, so that the obtained pyrolysis oil contains less dust, thereby effectively avoiding blockage of the pipelines and equipment due to tar condensing. Partial hydrogen-rich synthetic gas enters the pyrolysis reactor to provide a pyrolysis atmosphere, and the raw material coal is subjected to hydrogen-rich pyrolysis, so the tar quality is high.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a system for pyrolysis and gasification of middle and low rank coal and its application. Background technique [0002] Modern coal chemical industry has developed a variety of comprehensive coal chemical technologies, such as pyrolysis-combustion coupling, pyrolysis-gasification coupling, pyrolysis-chemical product coupling, etc. There are not many, and various technical difficulties have been encountered in the process of scaling up from pilot test to industrialization. Pyrolysis is the forerunner of various technologies. The oil and gas resources produced during the pyrolysis process enter the subsequent treatment process after the first stage of dust removal by the cyclone separator. However, the dust removal capacity of the cyclone separator is limited, and the interception and removal efficiency of fine particles below Φ10μm is low, resulting in a large amo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/04C10B57/18C10J3/60C10J3/84
Inventor 梅磊张宏伟陈水渺吴道洪
Owner 北京恒丰亚业科技发展有限公司
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