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Drying and dry distillation combined quality improving process and system for low rank coal

A low-rank coal and dry distillation technology, which is applied to the discharge device of dry distillation gas, special forms of dry distillation, indirect heating dry distillation, etc., can solve the problems of large coking wastewater treatment capacity and large gas treatment capacity, and reduce investment and operating costs. , The effect of increasing the heat exchange area and strengthening the dry distillation effect

Active Publication Date: 2012-04-18
SHANDONG TIANLI DRYING TECH & EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process and system adopt the combination of drying and multi-tube rotary low-temperature dry distillation to improve the quality, which solves the problems of large coking wastewater treatment capacity and large gas treatment capacity in the simple dry distillation process.

Method used

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  • Drying and dry distillation combined quality improving process and system for low rank coal
  • Drying and dry distillation combined quality improving process and system for low rank coal
  • Drying and dry distillation combined quality improving process and system for low rank coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, the 0-10mm raw coal from the raw coal bunker 1 enters the steam rotary dryer 3 through the double-screw conveyor 2. With the rotation of the steam rotary dryer 3 cylinder, it is lifted and sprinkled by the heat exchange tube, and is connected with the built-in heat exchange dryer. The tube and the superheated steam are in full contact with heat exchange, and the slope of the steam rotary dryer 3 is moved from the higher end to the lower end. By controlling the residence time of the coal in the cylinder, it is dried to a moisture content of less than 8%, preferably 5%. Next, it is discharged into the blending silo 7 by the discharge valve 4 at the tail of the steam rotary dryer 3 .

[0034]The pulverized coal from the blending silo 7 is fed into the multi-tube pulverized coal feeder in the multi-tube rotary carbonizer 9 through the belt 8, and then evenly distributed into the multiple dry distillation tubes through the feeder. On the one hand,...

Embodiment 2

[0039] Such as figure 2 As shown, the 0-10mm raw coal from the raw coal bunker 1 enters the inner heating fluidized bed dryer 19 through the double screw conveyor 2, and under the action of the blower I17, the superheated steam enters the bed after being uniformly distributed by the air distribution device to drive the coal to start flowing. The coal particles suspended in the gas flow exchange heat with the superheated steam for the first time. At the same time, during the fluidization process, the coal particles fully contact with the steam coil built in the internal heating fluidized bed dryer 19, so that the coal particles and the steam coil conduct a second heat exchange, and the internal heating of the fluidized bed by controlling the pulverized coal The residence time in the drier 19 is dried until the water content is below 8%, preferably below 5%, and the dry coal powder is sent into the blending bin 7 through the discharge valve 4.

[0040] The pulverized coal / gran...

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Abstract

The invention discloses a drying and dry distillation combined quality improving process and a drying and dry distillation combined quality improving system for low rank coal, which are used for overcoming the defects existing in the prior art and are particularly suitable for drying and dry distillation combined quality improvement of brown coal with high water content or other low rank coal such as long flame coal, non-caking coal or weakly caking coal, gas coal and the like. In the process, a combined quality improving method in which a steam revolving drier for drying and a multi-pipe revolving low-temperature dry distiller for dry distillation are provided is adopted, so that the problems of large coking wastewater handling capacity, large coal gas handling capacity and the like existing in a pure dry distillation process are solved. The drying and multi-pipe revolving low-temperature dry distillation combined quality improving process provided by the invention has the advantages of high energy utilization ratio, safe and stable systems, small dry distillation gas handling capacity, small coking wastewater handling capacity, high tar yield, high coal gas heat value and the like.

Description

technical field [0001] The invention relates to a combined upgrading process and system for low-rank coal, in particular to a combined upgrading process and system for dry distillation of low-rank coal with high water content. Background technique [0002] At present, the traditional processes for conversion and upgrading of low-rank coal mainly include drying and upgrading and low-temperature dry distillation and upgrading. [0003] 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. There are many low-rank coal drying technologies worldwide, including fixed bed, fluidized bed, rotary kiln, entrainment system, etc. The disadvantage of the dry upgrading process is that the treated coal sample is very easy to absorb mois...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B57/10C10B47/18C10B39/02C10B27/00
CPCY02P20/129
Inventor 王宏耀范红梅吴峰王振国李祥宇吴翠兰赵洪波潘振
Owner SHANDONG TIANLI DRYING TECH & EQUIP
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