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Lignite upgrading method

A technology of lignite and raw coal gas, which is applied in coking carbonaceous materials, petroleum industry, coking ovens, etc. It can solve the problems of high dust content in coal gas, high dust removal load, low porous strength of semi-coke, easy to break and mix in, etc.

Inactive Publication Date: 2015-11-18
SHENWU TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the high moisture and volatile content of lignite, lignite pyrolysis is easily broken to produce a large amount of powdered coke, which is mixed into raw coal gas and tar in large quantities.
At present, the following problems generally exist in lignite pyrolysis: semi-coke has low porous strength and is easily broken, high dust content in tar and low added value, high dust content in gas and high dust removal load
[0005] Therefore, the research on the pyrolysis of lignite still needs to be in-depth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, the lignite used in the experiment was selected from Tongliao, Inner Mongolia, and the base moisture was about 40 wt%.

[0041] Table 1 Coal quality indicators

[0042]

[0043] The pyrolysis experiment was carried out using a fixed bed pyrolysis furnace, as follows:

[0044] The lignite is crushed to 6-13mm, and the high-moisture lignite is dried to a moisture content of about 4wt%, and the particle size of the asphalt is crushed to less than 1mm for later use.

[0045] Then, 1kg lignite, 1kg pitch, and 1kg lignite pitch blend (the mass fraction of pitch in the blend is 10%) are placed in a high temperature resistant reaction tube respectively, and the pyrolysis temperature is set to be 550° C., and the holding time is 60min, the heating rate is 10°C / min, and the lignite-bituminous blend is fully mixed with a mixer before entering the furnace.

[0046] The raw coal gas obtained by pyrolysis is indirectly cooled by two stages to obtain condensed li...

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Abstract

The invention provides a lignite upgrading method which comprises the following steps: (1) uniformly mixing lignite and asphalt to obtain a raw material mixture; and (2) pyrolyzing the raw material mixture to obtain raw gas and semicoke. The method can avoid the problem of abundant powdered coke generated in the lignite independent pyrolysis process, effectively enhances the semicoke strength, reduces the dust content of tar, and lowers the pressure of the gas dust removal system. The lignite and asphalt are co-pyrolyzed and have certain synergistic effects in the pyrolysis process, so that the yield of the high-added-value product tar is effectively enhanced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for upgrading lignite. Background technique [0002] Lignite is a potential energy source supporting the sustainable development of my country's coal resources. Lignite is a low-rank coal with high moisture content, low calorific value, and is prone to weathering and spontaneous combustion. The disadvantages of lignite determine that lignite is not suitable for long-distance transportation, and its high activity determines that it cannot be stored for a long time. Therefore, lignite is generally mainly used for direct power generation at pitheads. Moreover, the combustion efficiency of lignite is extremely low, and a large amount of greenhouse gases and dust are produced during combustion, so it is necessary to seek reasonable development and utilization. [0003] At present, the processing and utilization of lignite mainly includes the following aspects: heat source f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B55/02
Inventor 王建民陈家全吴道洪
Owner SHENWU TECH GRP CO LTD
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