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In China, the raw coal washing rate is about 50%, and the annual sludge output exceeds 20 million tons. The utilization of slime is becoming increasingly urgent. Slime is a high-ash, low-calorie coal washing by-product. The traditional slime drying equipment uses coal to generate heat and direct contact with the coal slurry for drying. Such a drying technique has a discontinuous pressure filtration process, and its products are mostly blocks containing 25% water. The structure is difficult to mix with coal and cannot be used for industrial purposes. The direct outflow of coal dust caused by the outflow of coal dust is the main source of coal mine environmental pollution.
Each year, Xingtai Coal Washing Plant produces about 180,000 tons of filter slime, which was previously sold to civilians, sold at a low price, and the utilization of coal slime is not fully utilized. In order to make full use of the clean coal resources, in October 2010, Xingtai Coal Mine carried out a laboratory drying experiment of pressure filtration slime, and the results were very satisfactory. At the end of 2011, the pressure filtration slime drying project jointly developed by Suizhong Energy Co., Ltd. and Beijing China Mine Environmental Protection Technology Co., Ltd. was first used for industrial use at Suizhong Energy Co., Ltd. Xingtai Mine and was officially put into trial operation. The project uses a conductive drying process, using the company's thermal power plant superheated steam as a heat source, RD multi-stage conductive box dryer as the main equipment. Its technology and equipment are domestic first and internationally advanced. The project replaces the drum-type direct drying process and equipment commonly used in the country with a new indirect drying process and equipment, and adopts the leading domestic mixing drying technology to increase the throughput of wet slime. In addition, the multi-stage conductive box dryers in this project can realize stacking layouts, save floor space, workshop volume and investment, and have outstanding advantages of high efficiency and large processing volume. The project's drying system fully recycles the generated residual heat of steam condensate, the moisture of evaporating moisture, and the heat in the dried slime. It truly achieves environmental protection, energy conservation, and comprehensive utilization.
Conductive drying equipment
The project uses the original vacant main plant of the coal preparation plant as a drying workshop, and the diaphragm type quick-opening filter press system for dewatering coal slime is arranged together with the slime drying system, and the two systems of pressure filtration and drying are integrated into one, and the pressure filtration industry The wet coal slime directly enters the dryer and is dried in place: the dried coal slurry is sent directly to the washing and mixing coal bunker, mixed with the washed coal, and sent to the power plant for power generation. The coal slurry does not fall to the ground.
Pressurized slime drying technology utilizes the high temperature waste heat of the waste rock power plant to indirectly dry the coal sludge, avoiding dust outflow, slimming the coal slurry, and reducing the moisture content to about 16%, so that it meets the basic conditions for continuous and uniform incorporation into coal. Finally, a new coal blend with a wide range of market application, small pollution, and high profit has been formed, and this has become the thermal coal that the coal power plant and the social power plant are in short supply. It is reported that after the successful operation of the Xingtai Mine, the filter press slime drying technology will be promoted by the entire company of Suizhong Energy. The company's slime volume is nearly one million tons. If the technology is promoted, the annual profit will reach 150 million yuan.
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The conductive drying method transfers the heat required for drying indirectly through metal and other surfaces. The drying rate is lower than the direct drying method. The temperature of the product during constant speed drying is not related to the temperature of the heating source and is generally the same as the saturation temperature of the gas pressure in the device. In order to increase the drying rate and prevent uneven drying, mechanical agitation is usually used or the container itself is rotated to increase or constantly update the heat transfer surface of the material. Therefore, it is necessary to further study the adhesion problem of the heat transfer mechanism. The drying device itself is expensive, but it is characterized by a small load on the dust collecting system, a high thermal efficiency, easy recovery of the solvent, and a total cost much less than the direct drying method.
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