Raw gas cooling and fractionation method and coking apparatus

Abstract

The invention provides a raw gas cooling and fractionation method and a coking apparatus. The raw gas cooling and fractionation method is used for recycling raw gas discharged from a coking chamber of a coke oven; according to the method, the raw gas discharged from the coking chamber of the coke oven is cooled step by step, and different fractions in the raw gas are extracted step by step according to the boiling points of the fractions in the sequence from high boiling point to low boiling point. With the raw gas cooling and fractionation method, energy consumption and pollution are reduced, production cost is lowered down, and recovery efficiency of the raw gas is improved.

Description

technical field [0001] The invention belongs to the field of coking, and in particular relates to a raw gas cooling fractionation method and a coking device. Background technique [0002] In the field of coking, recycling the raw gas (or crude gas) discharged from the coke oven coking chamber can not only reduce environmental pollution, but also save energy. [0003] figure 1 It is a schematic diagram of a common raw gas recovery device. Such as figure 1 As shown, the raw gas recovery device includes a rising pipe 2 , a bridge pipe 3 and a gas collecting pipe 4 . Wherein, the riser pipe 2 is used to connect the coke oven carbonization chamber 1 and the bridge pipe 3 . An ammonia water nozzle 6 is arranged in the bridge pipe 3, and the ammonia water nozzle 6 communicates with the ammonia water pipe (or the ammonia water storage device) 5 through a pipeline. Utilize the ammonia water nozzle 6 to form the ammonia water into fine mist, so that it can fully contact with the ...

AI Technical Summary

Problems solved by technology

[0006] First, due to the high temperature of the raw gas entering the bridge pipe 3, it will not only increase the amount of ammonia water, but also increase the recovery cost of the raw gas; moreover, the condensable components in the raw gas will easily block and corrode the bridge pipe 3

[0007] Second, because the cooling is only carried out in the bridge pipe 3, the temperature of the cooled raw gas is still high, and it needs to be further cooled in the subsequent condensing and blasting section. The higher temperature raw gas increases the water consumption of the condensing and blasting section , thus increasing the recovery cost of raw gas

[0008] Third, in the process of using ammonia water to cool the raw gas, part of the ammonia water is vaporized and mixed with the raw gas, resulting in an increase in the volume of the raw gas; and the higher the temperature of the raw gas entering the bridge pipe 3, the more the volume of the raw gas increases. Therefore, the current cooling method will increase the water consumption of the subsequent condensing blast section, thereby increasing the recovery cost of raw gas

[0009] Fourth, in the recovery workshop, the cooled tar needs to be heated up again to distill and cut fractions, which will increase energy consumption and further increase the cost of raw gas recovery

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