Equipment and method for recycling raw coke oven gas waste heat for benzene removal and ammonia distillation

Abstract

The invention discloses equipment and method for recycling raw coke oven gas waste heat for benzene removal and ammonia distillation. The equipment comprises riser heat exchangers, an ammonia distilling reboiler, a negative pressure ammonia distilling tower, a benzene removal reboiler, a negative pressure benzene removal tower, a heat medium tank and a hot lean oil tank, wherein heat medium outlets of the riser heat exchangers are connected with the ammonia distilling reboiler, and the heat medium outlets are connected with the benzene removal reboiler; the benzene removal reboiler is connected with the heat medium outlets, a pipeline is connected with the negative pressure benzene removal tower, and the benzene removal reboiler is connected with the hot lean oil tank; the benzene removalreboiler is connected with the heat medium tank, the ammonia distilling reboiler is connected with the hot lean oil tank and the heat medium tank, the ammonia distilling reboiler is connected with thenegative pressure ammonia distilling tower, and the negative pressure ammonia distilling tower is connected with the ammonia distilling reboiler; the negative pressure benzene removal tower is connected with the hot lean oil tank, the hot lean oil tank is connected with a hot lean oil circulating pump, and the the hot lean oil circulating pump is connected with the benzene removal reboiler and the riser heat exchangers; and another pipeline is connected with an outlet of a heat medium pump, and the heat medium pump is connected with the heat medium tank.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery and utilization of coke oven rising pipe raw gas, in particular to a method and equipment for recovering waste heat of coke oven raw gas by using thermal fluid for removing benzene and distilling ammonia. Background technique [0002] The average temperature of the raw gas in the riser of the coke oven is about 700°C, and the heat produced is equivalent to about 35% of the heat consumed by coking. In direct contact with the raw gas, the raw gas is rapidly cooled to 80-83°C and sent to the subsequent gas refining system by vaporizing a large amount of circulating ammonia. The heat of the raw coal gas in the above process is converted into useless low-temperature water vapor (~82°C), which consumes a large amount of circulating water and low-temperature water to cool the raw coal gas, which is an obviously high energy-consuming and low-efficiency production process. [0003] A large num...

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Problems solved by technology

However, it has not been considered that steam as a heating medium for coking production and recovery will generate a large amount of wastewater, which will increase the difficulty and cost of wastewater treatment in coking plants. At the same time, low-pressure steam cannot be used for the debenzene regeneration process of coking. As far as the plant is concerned, it is a development system and an inefficient heat supply energy

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