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High volatile coal dust rotary drying process

A drying process and rotary dryer technology, applied in the direction of drying solid materials, non-progressive dryers, heating to dry solid materials, etc., can solve problems such as explosions and national production losses, achieve small gas consumption, avoid danger, cost saving effect

Active Publication Date: 2007-03-14
SHANDONG TIANLI DRYING TECH & EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also literature reports that explosions occurred, which caused great losses to national production.

Method used

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  • High volatile coal dust rotary drying process
  • High volatile coal dust rotary drying process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] Embodiment: the bituminous coal of volatile matter 36.3% is dried as follows, as shown in Figure 1, wet coal powder is transported to steam rotary dryer 13 through feed auger 14, in steam rotary dryer 13 inside, wet coal powder and steam The steam coil in the rotary dryer 13 performs mass transfer and heat transfer movement, the moisture in the wet pulverized coal is heated and then evaporated, and the evaporated moisture is taken away by the moisture-carrying gas. After the pulverized coal is dried, the temperature rises gradually. At the discharge port of the rotary dryer, the pulverized coal is completely dried to the rated value, and the surface temperature rises to the highest level. The conveying auger A12, conveying auger B11, and conveying auger C10 convey the dried hot coal powder to the rotary cooler 9, and under the cooling of the rotary cooler 9, the hot coal powder is gradually cooled to the rated value, and then in the rotary The outlet of cooler 9 falls i...

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Abstract

The invention relates to a high volatile drying technique for coal powder. Steam is thermal source and steam pipe is contacted with wet coal powder directly. Dry and hot coal powder, in which water is vaporized out by heating, is sent to revolving cooling machine by auger and is cooled in the revolving cooling machine, regular coal powder is sent into coal powder tank; water vaporized is carried out by watercarrying nitrogen. Watercarrying nitrogen is heated and sent into drier and passes through first grade fabric filter with partial coal powder; in first grade fabric filter most coal powder is settled down and residual coal powder is settled down through second grade fabric filter; almost clean nitrogen is sent into table cooler and cooled by cycle air-blower, water is eliminated by defogger and the nitrogen is sent back to nitrogen tank with closed cycle. In the whole drying process it is the nitrogen circumstance entirely so that the explosive risk is avoided and by closed cycle the cost is saved with little nitrogen amount.

Description

technical field [0001] The invention relates to a coal powder drying process, in particular to a highly volatile coal powder rotary drying process. Background technique [0002] We know that pulverized coal with a volatile content greater than 20% is flammable and explosive. Coal powder that has reached the explosion limit, no matter in a closed space or in an open space, will cause explosive combustion when it encounters an ignition source when the oxygen content is appropriate (generally greater than 15%). In the slightest, it will damage the equipment, and in the worst case, it will cause casualties, which brings great hidden dangers to safe production. This requires that the pulverized coal drying process should fully consider the various possibilities of pulverized coal explosion, and eliminate hidden dangers to the greatest extent. [0003] The drying processes currently used in coal powder in China mainly include: airflow drying, fluidized bed drying and drum drying...

Claims

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Application Information

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IPC IPC(8): F26B11/02F26B3/24
Inventor 史元芝吉海亮吴静田青郭文
Owner SHANDONG TIANLI DRYING TECH & EQUIP
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