Coal slime dehydration drying equipment and method

Abstract

The invention discloses a coal slurry dewatering and drying device and method. The device comprises a drying room and a coal slurry conveying device, a warm air machine and a negative pressure fan which are arranged inside the drying room. The coal slurry conveying device comprises a plurality of conveying belts arranged in a zigzag manner from top to bottom. A vibration feeder is arranged above the coal slurry inlet end of the uppermost conveying belt of the coal slurry conveying device. A feeding sealing door is formed in the top of the drying room. A discharging hopper is arranged below the coal slurry outlet end of the bottommost conveying belt of the coal slurry conveying device. A discharging sealing door is formed in the bottom of the drying room. The negative pressure fan and a warm air to atmosphere gate are arranged at the upper portion of the drying room. The hot air machine, a hot water inlet and outlet and the like are arranged at the lower portion of the drying room. The warm air to atmosphere gate is formed in the side wall of the upper portion of the drying room. The invention further discloses the coal slurry dewatering and drying method applied to the device. The device and method have the beneficial effects of saving energy and being environment-friendly, efficient, low in drying temperature, high in speed and efficiency, simple in structure and small in occupied area.

Description

technical field [0001] The invention relates to the field of coal slime drying, in particular to a coal slime dehydration drying equipment and method. Background technique [0002] At present, the water content of the filtered coal slime on the production line is about 22%; the traditional coal slime drying is to blow the coal slime with 800-degree hot air to dehydrate it. This high-temperature hot air slime drying method has been used for decades The problem with dry technology is that dust and harmful gases are difficult to meet environmental protection standards. [0003] According to the laws of thermodynamics, the heat of vaporization of water decreases with the increase of temperature. The specific heat capacity of water is much greater than that of solids, so increasing the water temperature to reduce the heat of vaporization to vaporize water is not worth the candle. [0004] For example: the heat of vaporization of water is 2366.4KJ / kg, 2295.2KJ / kg and 2258.4KJ / kg...

AI Technical Summary

Problems solved by technology

[0002] At present, the water content of the filtered coal slime on the production line is about 22%; the traditional coal slime drying is to blow the coal slime with 800-degree hot air to dehydrate it. This high-temperature hot air slime drying method has been used for decades The problem with dry technology is that dust and harmful gases are difficult to meet environmental protection standards

But for slime dehydration, the dehydration efficiency is limited only by 55 degree hot air

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