Drying process for humidifying coals by using coke oven flue gas and device

Abstract

The invention relates to a drying process for humidifying coals by using coke oven flue gas and a device. The drying process comprises the following steps of: putting coal materials into a cyclone separator and a vibrating fluidized bed; humidifying and drying the coal materials in the vibrating fluidized bed by using unsaturated coke oven flue gas; carrying the coal materials with smaller grain size to leave the vibrating fluidized bed by the coke oven flue gas after executing thorough heat and moisture exchange of the coke oven flue gas and the coal materials; and entering the cyclone separator by a heat preserving pipeline, wherein the coal materials entering the cyclone separator from a raw original inlet can be firstly exchanged in heat and moisture with the flue gas which still has a drying function from the fluidized bed in the cyclone separator so that raw coals enter the vibrating fluidized bed after being primarily dried in the cyclone separator. In the process and the device, the coke oven flue gas is used for humidifying and drying the raw coals; therefore, a pollution problem caused by the discharge of the flue gas generated by coking can be effectively solved; simultaneously, the flue gas is used as a heat source for drying the humid coals; and therefore, the invention largely saves energy sources, has high heat exchange efficiency, saves energy and reduces carbon emission.

Description

technical field

[0001] The invention relates to the technical field of heat and moisture exchange, in particular to a process and a device for adjusting the humidity of materials with relatively high humidity, such as coking coal, by using the waste heat of unsaturated coke oven flue gas. Background technique

[0002] At present, the coking coal used in coking plants at home and abroad is transported from the coal yard, mixed with coal to achieve the proportion of coal types, and then crushed and directly loaded into the coke oven. As a result, the humidity of the added coal is about 10%, and the humidity is relatively high. The coke oven needs to heat this part of the water during the coking process, which leads to waste of heat energy. At the same time, the temperature of a large amount of flue gas generated by coking is about 200 degrees Celsius. These flue gases are directly discharged into the atmosphere, which not only pollutes the environment but also wastes energy. I...

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