Dry coke quenching residual heat energy recycling and coking wastewater treatment combined technology

Abstract

The invention provides a dry coke quenching residual heat energy recycling and coking wastewater treatment combined technology. Ammonia evaporation wastewater is upward sprayed out from the bottom ofa cooling section of a dry coke quenching furnace (1) to absorb sensible heat of red coke; the ammonia evaporation wastewater is in direct contact with the red coke and is gasified to generate steam;the steam and the red coke are subjected to heat absorption chemical reaction to generate water gas; meanwhile, organic matter pyrolysis gas in the ammonia evaporation wastewater, the water gas and the steam form mixed gas; the mixed gas is exhausted from an annular channel in the middle of the dry coke quenching furnace; after the mixed gas is subjected to dust removal, the mixed gas is conveyedinto a dry coke quenching residual heat boiler (3); and the mixed gas sequentially passes through a steam overheating section, upper and lower sections of a tower-bottom circulating oil heater of a benzene removal tower, an evaporation section of the dry coke quenching residual heat boiler and a tower-bottom circulating ammonia water heating section of an ammonia evaporation tower from top to bottom and is subjected to gradient heat exchange, and the mixed gas is output from the bottom of the dry coke quenching residual heat boiler. According to the technology provided by the invention, dry coke quenching residual heat energy is used for replacing negative-pressure evaporated ammonia and a negative-pressure benzene removal heat source; the coking wastewater also can be treated to obtain the water gas; and the technology can be used for effectively recycling and utilizing the dry coke quenching residual heat energy, and energy saving and environment protection are realized.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of heat energy in coking production, and in particular relates to a combined process of dry quenching waste heat heat energy recycling and coking wastewater treatment. Background technique [0002] Coke dry quenching technology (CDQ, Coke Dry Quinching) uses low-temperature inert gas (nitrogen, steam, flue gas or coke oven gas) to exchange heat with red hot red coke in the dry quenching furnace to cool the red coke. After absorbing the sensible heat of red coke, the high-temperature inert gas transfers heat to the CDQ boiler to generate steam. The inert gas is cooled and the temperature drops, and then the circulating fan is blown into the CDQ furnace to cool the red coke for recycling. The steam generated by the CDQ boiler can be combined into the steam pipe network or sent to generate electricity. CDQ has a series of advantages such as recovering heat, reducing pollution and improving c...

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Problems solved by technology

Among them, the incineration method is that when the sewage is at a temperature of about 1000°C, almost any organic matter will be decomposed into non-toxic hydrogen and carbon monoxide. This method not only treats phenol thoroughly, but also has a conversion rate of 99.99% for various organic matter in sewage. %, fully meet the requirements of environmental protection, but this method requires a large amount of external heat source, high energy consumption, in fact it is difficult to promote

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