High-temperature raw gas waste heat and tar recovery device and recovery method therefor

Abstract

The invention discloses a high-temperature raw gas waste heat and tar recovery device and a recovery method therefor. The recovery device is characterized in that a tar recovery device is arranged in a high-temperature raw gas waste heat recovery device, and the high-temperature raw gas waste heat recovery device and the tar recovery device are integrated for continuous recovery. The recovery method comprises the following steps: directly introducing high-temperature raw gas at the top of a coking furnace into a heat exchanger through a collection pipe, exchanging heat with heat exchange pipes of a coal saver, an evaporator and an overheater, and discharging the raw gas subjected to heat exchange; generating overheat steam by cooling water subjected to heat exchange through the coal saver, the evaporator, the overheater and a steam pocket to drive a steam turbine to generate power; and removing oxygen from condensed water through a condensate pump and an oxygen remover, and recycling the condensed water subjected to oxygen removal together with tap water. The recovery device is simple in structure and continuous in operation, the water consumption is greatly reduced, the wastewater discharge is reduced, and waste heat and tar in the high-temperature raw gas are efficiently recovered.

Description

technical field [0001] The invention relates to a device and method for recovering waste heat and tar of raw coal gas, in particular to a device and method for recovering waste heat and tar of high-temperature raw gas from a coking process. Background technique [0002] In the coking production process, the sensible heat brought out by the red coke at 950-1050°C from the carbonization chamber accounts for 37.52% of the total heat output of the coke oven; the heat brought out by raw coal gas at 650-950°C accounts for 33.76% of the total heat output of the coke oven , the traditional treatment method for the waste heat contained in these red-hot cokes is: high-temperature raw coal gas at 650-950 °C escapes through the riser pipe, and directly sprays a large amount of circulating ammonia water at 70-78 °C in the bridge pipe and gas collection pipe. A large amount of ammonia water is vaporized, which makes the raw gas cool down sharply to 80-85°C; the cooled raw gas is further c...

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Problems solved by technology

[0012] In view of the shortcomings of the existing high-temperature raw gas rising pipe waste heat and tar recovery device, the present invention provides a high-temperature raw gas waste heat and tar recovery device and its recovery method to solve the heat loss existing in the traditional ammonia water cooling high-temperature raw gas structure And the problem of large consumption of cooling water and low heat recovery efficiency of the riser waste heat recovery device; at the same time, the use of mechanical scrapers and cleaning fluid combined with tar cleaning device solves the problem of low heat exchange efficiency caused by condensed tar attached to the outer wall of the heat exchange tube

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