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Method and system for improving quality of low-rank coal

A low-rank coal and lignite technology, applied in special forms of dry distillation, petroleum industry, coke ovens, etc., can solve the problems of single, fixed distribution, energy mismatch between units, etc., achieve flexible combination, save equipment investment, and improve quality Effect

Active Publication Date: 2013-12-04
SHANDONG TIANLI DRYING TECH & EQUIP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The energy flow direction is completely opposite to the material flow direction, and the distribution form is fixed and single. When the operating conditions change, there is a problem of energy mismatch between units

Method used

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  • Method and system for improving quality of low-rank coal
  • Method and system for improving quality of low-rank coal

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Embodiment Construction

[0013] Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0014] figure 1 It is a low-rank coal upgrading method 1000 according to an embodiment of the present application. As shown in the figure, in step S110, the lignite crushed to a predetermined degree is dried and dehydrated. For example, after the raw lignite is crushed to a particle size of less than 13mm, it is sent to a drying unit (such as a steam rotary dryer) for drying and upgrading, and the lignite moisture is removed to 8%.

[0015] In step S120, the dried and dehydrated lignite is sorted to remove coal dust. As an option, the dried and dehydrated lignite is subjected to particle size classification using fluidizing wind, and the coal whose sedimentation velocity is lower than the fluidizing wind velocity is removed as coal powder. For example, the dried and upgraded lignite is sent to a sorting unit (such as a fluidized bed winnowing device...

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Abstract

The application discloses a method and system for improving the quality of low-rank coal. The method comprises the following steps: drying to remove water in lignite which is crushed into a preset degree; sorting the dried lignite to remove pulverized coal; conducting destructive distillation on the sorted lignite at a low temperature. According to the application, the adjustability of the whole process is enhanced, and the energy distribution of the system is optimized, so that the adverse impact of pulverized lignite on low-temperature destructive distillation is reduced to the maximum extent, the quality of tar is improved, and the granularity range of quality-improving feed coal is broadened; as severe screening of the feed coal is not required, equipment investment is reduced, and potential accidents of dust pollution and spontaneous combustion are reduced.

Description

technical field [0001] This application relates to the field of low-rank coal upgrading. Background technique [0002] At present, the traditional processes for conversion and upgrading of low-rank coal mainly include drying upgrading and low-temperature dry distillation upgrading. Ordinary drying and upgrading technology is mostly used to upgrade lignite coal with high water content. The principle is mainly to use physical methods, such as raising temperature and pressurizing, to make the moisture in the raw coal quickly turn into a gaseous form, so as to achieve removal. the goal of. Low-temperature dry distillation upgrading refers to the processing method of heating coal under non-oxidative conditions to finally obtain tar, gas and semi-coke. Low-rank coal is generally dried and dehydrated before low-temperature carbonization upgrading to reduce the heat load of carbonization, but the upgrading process after drying and carbonization often has the problem of mismatching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B57/00
Inventor 王宏耀吴静曹明见陈强黄贤具吴峰吴翠兰姜荣泉
Owner SHANDONG TIANLI DRYING TECH & EQUIP
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