Humidity conditioning device for coking coal

Abstract

The invention relates to a humidity conditioning device for coking coal. A semi-circular impinging stream drying technology is adopted. Flue gas discharged by a coke oven is used as a heat source; the flue gas is directly in contact with pulverized coal in a dryer to force collision and enhancing the heat and mass transfer and the evaporation dehydration process, so that the coal moisture is reduced to the range of less than or equal to 6.5 percent from the range of 10 to 11 percent; and then the pulverized coal is fed into an oven to be coked, so that the coking heat loss is reduced, the yield and the quality of coke are improved. Weakly caking coal can be added and the coking coal is used as little as possible, so that the cost is reduced, steam for evaporating residual ammonia is reduced and the discharge of greenhouse gases and sewage is reduced. The humidity conditioning device for the coking coal has obvious economic and social benefits. The device has high heat transfer coefficient of equipment volume. Compared with the drying strength of a fluidized bed, the drying strength of the device is improved by one order of magnitude. Main body equipment is of a standing container structure. The equipment is not provided with a rotary part. The drying process almost does not need to be maintained. The humidity conditioning device is simple and stable to operate and control.

Description

technical field [0001] The invention belongs to the field of drying, and mainly relates to a drying device for granular materials, in particular to a humidity regulating device for coking coal. Background technique [0002] In coke oven coking production, the drying of coal is usually called coke oven coking coal moisture control technology (CMC), which was first developed and applied by Nippon Steel in Japan, that is, the waste heat of the coking plant is used to heat the coal to reduce its moisture content. To about 6%, the technology of reloading into coke ovens has obvious energy saving, emission reduction, and production increase benefits. In 2008, it was included in the first batch of recommended projects in my country's "National Key Energy Conservation Promotion Catalogue". [0003] my country has successively introduced the first generation of heat transfer oil indirect drying technology from Japan, which has complicated process, large investment and high operating c...

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Problems solved by technology

[0003] my country has successively introduced the first generation of heat transfer oil indirect drying technology from Japan, which has complicated process, large investment and high operating cost; the second generation steam indirect drying technology has simple process, easy control and low production cost, but high investment and requires steam as heat source ; The third generation, the fluidized bed direct drying technology using coke oven exhaust gas as the heat source, because the imported technology is expensive, only a limited number of companies adopt it. The core equipment of the more advanced third-generation technology-gas distribution of fluidized bed components board, must also be provided by the Japanese side

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