Process technology and device for simultaneously recovering various gases such as hydrogen and methane gas from petrochemical exhaust gas emissions

Abstract

The invention relates to a process technology and a device for simultaneously recovering various gases such as hydrogen and methane gas from petrochemical exhaust gas emissions. The volume percent of hydrogen in the exhaust gas emissions is 28-55%, and the volume percent of hydrocarbon in the exhaust gas emissions is 30-56%. A vacuum pressure swing adsorption-pressure swing adsorption composite integrated device is used in the process technology. The process technology comprises the following steps: (a) a hydrocarbon gas-vacuum pressure swing adsorption stage, wherein a vacuum pressure swing adsorption device is utilized to separate a hydrocarbon gas product from the exhaust gas emissions and to produce an intermediate gas; and (b) a hydrogen-pressure swing adsorption stage, wherein a pressure swing adsorption device is utilized to separate a hydrogen gas product from the intermediate gas generated in the step (a). According to the process technology, high-purity hydrogen, hydrocarbon gas and carbon-rich fuel gas with a higher calorific value can be produced at the same time.

Description

technical field [0001] The invention relates to the field of tail gas separation and recovery, in particular to a process technology and a device for simultaneously recovering hydrogen, methane and other gases from petrochemical tail gas. Background technique [0002] The petrochemical industry consumes a large amount of hydrogen for hydrogen reforming, hydrocracking, oil and gas hydrogenation and other processes. Since the introduction of pressure swing adsorption for the separation of synthesis gas in the early 1980s, steam reforming of methane and reforming of coal-to-synthesis gas for hydrogen production have become the main hydrogen production methods in the petrochemical industry. At the same time, the petrochemical industry needs to produce or process a large amount of hydrogen and carbon (such as methane (CH 4 ), carbon dioxide (CO 2 ), etc.), such as methane steam reforming hydrogen production tail gas, cracked dry gas, hydrogen production tail gas and flare gas, ...

AI Technical Summary

Problems solved by technology

As mentioned earlier, the existing technologies in the past only proposed some superficial concepts, and did not disclose specific hydrogen-pressure swing adsorption (H 2 -PSA) and methane-vacuum pressure swing adsorption (CH 4 -VSA) mixed recovery system to simultaneously achieve high-purity hydrogen and high-purity methane from the tail gas of petrochemical / refinery alkane olefin recovery processing units (such as C2 systems) and similar industrial units

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