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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 field of systems for processing low-rank coal, which can solve the problems of low gangue discharge rate of low-rank coal, and achieve the effects of improving sorting accuracy, improving enterprise economic benefits, and reducing energy costs.

Inactive Publication Date: 2016-06-15
SHENWU TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • 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

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  • System and method for treating low-rank coal

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specific Embodiment

[0086]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 crushing device for crushing so as to obtain crushed coal; (2) supplying the crushed coal to the classifying device Carrying out grading treatment so as to obtain lump coal and pulverized coal; (3) supplying the lump coal to the lump coal hot-air composite sorting device and using the first hot air to perform gangue discharge and pre-drying treatment on the lump coal, In order to obtain the first gangue, the first clean coal and the first tail gas containing dust respectively; (4) supply the pulverized coal to the pulverized coal hot air heavy medium separation device and use the second hot air and...

Embodiment

[0125] 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.

[0126] Table 1 Analysis results of raw coal properties

[0127] Total water (wt%)

specific Embodiment approach

[0128] The specific embodiment comprises the processing steps of following order:

[0129] 1) The raw coal is first supplied from the raw coal bunker to the crushing device for crushing, and then sent to the grading device through the belt and coal feeder for grading treatment to obtain lump coal (particle size not less than 6mm, ash content 20.38%) and pulverized coal ( The particle size is less than 6mm, and the ash content is 23.89%);

[0130] 2) The lump coal obtained after classification is supplied to the lump coal hot air compound sorting device for sorting treatment, the temperature of the hot air is controlled at 105°C, and the rising air velocity is 18.32m / s. After the lump coal is treated by the hot air compound exhaust , to obtain clean coal products, the moisture, ash, and sulfur of clean coal are 12.35%, 18.90%, and 0.51% respectively. At the beginning, external hot air was used as the gangue discharge medium;

[0131] 3) The pulverized coal obtained in step 1) ...

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Abstract

The invention discloses a system and method for treating low-rank coal. The system comprises: a grading device, a hot blast combined separator for lump coal, a hot blast dense medium separator for pulverized coal, a pyrolysis device, a semi-coke waste heat recycling device, a pulverized coal drying device and a pulverized coal gasifying device; a lump coal outlet of the grading device is in connection with a lump coal inlet of the hot blast combined separator for lump coal; a cleaned coal inlet of the pyrolysis device is in connection with a cleaned coal outlet of the hot blast combined separator for lump coal; a pulverized coal inlet of the hot blast dense medium separator for pulverized coal is in connection with a pulverized coal outlet of the grading 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 connected respectively with a hot blast inlet of the hot blast combined separator for lump coal and a hot blast inlet of the hot blast dense medium separator for pulverized coal; a pulverized coal inlet of the pulverized coal drying device is in connection with a cleaned coal outlet of the hot blast dense medium separator for pulverized coal; a dried pulverized coal inlet of the pulverized coal gasifying device is connection with a dried pulverized coal outlet of the pulverized coal drying device.

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 refers to coal with poor cohesiveness and low degree of coalification, such as lignite, peat, long-flame coal, and weathered coal. my country is rich in low-rank coal resources, accounting for more than 55% of the total proven coal in my country. [0003] At present, the main utilization method of low-rank coal is direct combustion for power generation. Although this utilization method is simple and easy to operate, it causes a great waste of energy and equipment. In addition, the thermal efficiency of direct combustion of low-rank coal is low, and the combustion of low-rank coal will produce SOx, CO, and NOx, which will cause serious pollution to the atmosphere. The upgrading and processing of low-rank coal will become the key to the effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/60C10B53/04C10B57/10
CPCY02P20/129C10J3/60C10B53/04C10B57/10
Inventor 赵小楠丁力张佼阳吴道洪
Owner SHENWU TECH GRP CO LTD
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