Integration process of coke dry quenching co-production synthesis gas and downstream products thereof of methanol

Abstract

The invention discloses an integrated process of a dry quenching coke coproduction synthesis gas and the downstream product, methanol of the synthesis gas. The integrated process adopts the following steps that: low-pressure steam or the mixed gas of low-pressure steam and coke oven gas is used as cooling gas to absorb red coke sensible heat and to carry out water-gas reaction with red coke, thereby generating a synthesis gas; after dust removal, the synthesis gas is fed to a steam gas waste heat boiler and a low-pressure steam waste heat boiler to carry out heat recovery, and then is output; the steam gas waste heat boiler generates steam gas, while the low-pressure steam waste heat boiler generates low-pressure steam which is fed in a dry quenching coke oven as cooling gas; or the steam gas is used in a back pressure steam turbine to generate electricity, and the low-pressure steam left over after back pressure electricity generation is used as the cooling gas of dry quenching coke, thereby omitting the low-pressure steam waste heat boiler. Compared with the prior art, the integrated process combines the production of dry quenching coke and synthesis gas, and ensures that the dry quenching coke oven integrates the functions of quenching coke, conversion, gas making and coke desulfurization; meanwhile, methanol is made through making use of the synthesis gas generated during dry quenching coke.

Description

technical field [0001] The invention relates to a coke dry quenching process, in particular to an integrated process for simultaneously preparing synthesis gas and co-producing methanol through dry coke quenching, and belongs to the technical fields of chemical and metallurgical production. Background technique [0002] Coke dry quenching technology (CDQ, Coke Dry Quinching) uses low-temperature inert gas (nitrogen or flue gas) to exchange heat with red hot red coke in a 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 an...

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Problems solved by technology

The existing conversion processes of coke oven gas to synthesis gas include steam reforming, pure oxygen catalytic partial oxidation and non-catalytic partial oxidation. These processes have the disadvantages of large reformer investment, need to use reforming catalysts, high raw gas consumption, and hydrogen-carbon The disadvantages such as too high ratio and insufficient utilization of residual hydrogen make the process of coke oven gas to syngas complex, high energy consumption and insufficient resource utilization

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