Coke oven gas cracking and coke dry quenching integrated process and device

Abstract

The invention relates to a coke oven gas cracking and coke dry quenching integrated process and device, and the method comprises the following steps: high-temperature raw coke oven gas enters the middle part of a cracking dry quenching furnace and exchanges heat with hot high-temperature coke flowing downwards for heating and high-temperature cracking, and the coal gas after high-temperature cracking is sent out from the upper part of the cracking dry quenching furnace; coal gas is extracted from the middle of the cracking dry quenching furnace, is cooled by a waste heat boiler, is pressurized by a circulating fan and is fed into the cracking dry quenching furnace from the lower part of the cracking dry quenching furnace, coke at the lower part of the cracking dry quenching furnace is cooled from bottom to top, and the coal gas is extracted from the middle of the cracking dry quenching furnace again for circulation; hot red coke is loaded from the top of the cracking dry quenching furnace, firstly exchanges heat with coke oven raw gas entering from the middle at the upper part, is cooled, then flows to the lower part of the furnace, exchanges heat with circulating cooling gas entering from the lower part of the cracking dry quenching furnace, is cooled into cold coke, and finally is sent out. According to the invention, coke oven incandescent red coke heating coal gas high-temperature cracking and red coke dry quenching are integrated, the process is simple, and energy is saved. And high-temperature cracking of the raw coke oven gas, coke re-desulfurization and dry quenching are realized.

Description

technical field [0001] The invention relates to the technical field of high-temperature pyrolysis of coke oven gas and dry quenching of coke, in particular to an integrated process and device for pyrolysis of coke oven gas and dry quenching of coke. Background technique [0002] China's domestic natural gas is scarce, and coke oven gas is relatively surplus. With the intensification of climate change and the stricter control of carbon emissions, the production of DRI by gas-based reduced iron has become a hot spot in the field of ironmaking. At present, the technology of producing DRI by gas-based reduction of natural gas has matured. However, due to the shortage of domestic natural gas, it is impossible to provide a large amount of natural gas resources for the ironmaking industry. Relatively surplus coke oven gas is the best substitute. However, due to the shortcomings of coke oven gas such as low calorific value and high impurity content, it needs to be treated in a target...

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Problems solved by technology

[0002] China's domestic natural gas is scarce, and coke oven gas is relatively surplus. With the intensification of climate change and the stricter control of carbon emissions, the production of DRI by gas-based reduced iron has become a hot spot in the field of ironmaking. At present, the technology of producing DRI by gas-based reduction of natural gas has matured. However, due to the shortage of domestic natural gas, it is impossible to provide a large amount of natural gas resources for the ironmaking industry. Relatively surplus coke oven gas is the best substitute. However, due to the shortcomings of coke oven gas such as low calorific value and high impurity content, it needs to be treated in a targeted manner It is possible to meet the needs of gas-based reduction to produce DRI, especially the aromatics (including tar and benzene) contained in coke oven gas must be cracked into H 2 , CO can meet the gas requirements of gas-based reduction, so coke oven gas cracking is the basic requirement for its use in gas-based reduction of iron to produce DRI

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