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System and method for treating low-rank coal

A technology for low-rank coal and pulverized coal is applied in the system field of processing low-rank coal, which can solve the problems of low gangue discharge rate of low-rank coal, and solve the problem of low gangue discharge rate, poor quality of pyrolysis products and problems of gasification gas. Poor quality, the effect of improving the quality of pyrolysis products

Pending Publication Date: 2016-06-15
SHENWU TECH GRP CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

For this reason, an object of the present invention is to propose a system and method for processing low-rank coal. This system can solve the problem of low waste-discharging rate of low-rank coal in the existing compound gangue discharge technology, thereby improving the subsequent pyrolysis process. The quality and yield of pyrolysis products in the process, and by recovering the waste heat generated in the pyrolysis process for the gangue discharge process, energy costs can be significantly reduced. At the same time, gasification gas can be obtained by gasifying pulverized coal, which can not only Significantly improve the utilization rate of raw materials, and can improve the economic benefits of enterprises

Method used

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  • System and method for treating low-rank coal
  • System and method for treating low-rank coal

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specific Embodiment

[0072] In yet another aspect of the present invention, the present invention provides a method for processing low-rank coal. According to an embodiment of the present invention, the method is carried out by using the above-mentioned system for processing low-rank coal. According to a specific embodiment of the present invention, the method includes: (1) supplying low-rank coal to the hot-air composite gangue discharge device, and using hot air to perform gangue discharge and pre-drying treatment on the low-rank coal, so as to obtain gangue respectively , clean coal and dust-containing tail gas; (2) supply the clean coal to the screening device for screening to obtain lump coal and pulverized coal; (3) supply the lump coal to the Perform pyrolysis treatment in the pyrolysis device to obtain semi-coke and pyrolysis oil gas; (4) supply the semi-coke to the semi-coke waste heat recovery device for waste heat recovery treatment in order to obtain cooled semi-coke and hot gas, and ...

Embodiment

[0102] use Figure 7 The system for processing low-rank coal shown in the figure processes low-rank raw coal. The raw coal processing capacity in this embodiment is 300,000 tons / year, and the processing particle size range is full particle size. The moisture, ash, sulfur, and calorific value of the raw coal The analysis results are shown in Table 1.

[0103] Table 1 Analysis results of raw coal properties

[0104] Total water (wt%)

specific Embodiment approach

[0105] The specific embodiment comprises the processing steps of following order:

[0106] 1) The raw coal is first sent from the raw coal bunker through the belt and the coal feeder to the hot air compound gangue discharge device for gangue removal treatment. The temperature of the hot air is controlled at 105°C and the upward air velocity is 10.76m / s. After the raw coal is processed by the hot air composite gangue discharge , to obtain clean coal products, the moisture, ash, and sulfur of clean coal are 20.34%, 14.52%, and 0.77% respectively. At the beginning, external hot air is used as the gangue discharge medium;

[0107] 2), the clean coal produced in 1) is fed into a screening device for screening treatment to obtain lump coal (particle size not less than 6mm) and pulverized coal (particle size less than 6mm);

[0108] 3), send the obtained lump clean coal into a pyrolysis device for pyrolysis treatment, the pyrolysis temperature is 600°C, and obtain pyrolysis oil gas a...

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Abstract

The invention discloses a system and method for treating low-rank coal. The system comprises: a hot blast combined gangue discharging device, a screening device, a pyrolysis device, a semi-coke waste heat recycling device, a pulverized coal drying device and a pulverized coal gasifying device; a cleaned coal inlet of the screening device is in connection with a cleaned coal outlet of the hot blast combined gangue discharging device; a pump coal inlet of the pyrolysis device is in connection with a lump coal outlet of the screening device; a semi-coke outlet of the semi-coke waste heat recycling device is in connection with a semi-coke outlet of the pyrolysis device, and a hot gas outlet of the semi-coke waste heat recycling device is in connection with a hot gas inlet of the hot blast combined gangue discharging device; a pulverized coal inlet of the pulverized coal drying device is in connection with a pulverized coal outlet of the screening device; a dried pulverized coal inlet of the pulverized coal gasifying device is in connection with a dried pulverized coal outlet of the pulverized coal drying device. With the system, it is possible to solve the problem that gangue discharging rate is low for low-rank coal in existing combined gangue discharging technology, semi-coke waste heat produced in pyrolysis is recycled for discharging gangue, energy cost is reduced, and pulverized coal is gasified in the meantime so that utilization rate of raw material is increased.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, in particular, the invention relates to a system and method for processing low-rank coal. Background technique [0002] Low-rank coal mainly includes non-caking coal, weakly caking coal, long-flame coal and lignite, etc., which have the characteristics of high moisture, low density, high volatile content, non-caking, strong chemical reactivity, poor thermal stability and low calorific value. The proven reserves of low-rank coal resources in China are also more than 200 billion tons, and the reserves of low-rank coal account for more than 55% of the proven coal reserves. [0003] The thermal efficiency of direct combustion of low-rank coal is low, and the emission of greenhouse gases is also large, making it difficult to develop and utilize on a large scale. It is difficult for low-rank coal to meet the quality requirements of various users without upgrading and processing. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/46C10J3/50C10J3/48C10B53/08C10B57/10
CPCC10B53/08C10B57/10C10J3/46C10J3/48C10J3/50C10J2300/0906C10J2300/0909C10J2300/0959C10J2300/0976Y02P20/129
Inventor 赵小楠丁力郭启海刘维娜吴道洪
Owner SHENWU TECH GRP CO LTD
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