Carbon dioxide purification system integrated with synthesis gas desulfurization system

Abstract

A carbon dioxide purification system integrated with a synthesis gas desulfurization system comprises a solution-incondensable gas separator. An inlet of the solution-incondensable gas separator is connected with an intermediate-pressure solution pipe, an impurity incondensable gas discharge pipe at the top of the solution-incondensable gas separator is connected with a main desulfurization system pipe, a liquid outlet pipe at the bottom of the solution-incondensable gas separator is connected with an inlet of a solution-carbon dioxide gas separator, a gas outlet at the top of the solution-carbon dioxide gas separator is connected with an inlet of a carbon dioxide gas-liquid separator through a cold energy recovery heat exchanger, a carbon dioxide compressor, a water cooler in back of the compressor and a quench heat exchanger, an impurity incondensable gas discharge pipe at the top of the carbon dioxide gas-liquid separator is connected with the main desulfurization system pipe, a liquid carbon dioxide discharge pipe at the bottom of the carbon dioxide gas-liquid separator is connected with a storage tank, and a solution discharge pipe at the bottom of the solution-carbon dioxide gas separator is connected with the main desulfurization system pipe through a power pump. The invention can purify and produce liquid carbon dioxide.

Description

technical field [0001] The invention belongs to the technical field of greenhouse gas emission reduction, and in particular relates to a carbon dioxide purification system integrated with a synthesis gas desulfurization system. Background technique [0002] Among the "greenhouse gases" that cause global warming, CO 2 It is one of its main components, and its contribution to the greenhouse effect exceeds the sum of other greenhouse gases. Injection of CO2 products into producing oil fields allows for simultaneous CO2 enhancement of oil recovery (EOR) 2 Sealing, from "being harmed by the sky" to "being treasured by the earth", realizing CO2 while obtaining certain economic benefits 2 emissions reduction; also for enhanced coal bed methane mining (ECBM), carbonated beverages, CO 2 Gas shielded welding, dry ice making, tobacco puffing, cement making, converter steelmaking and degradable plastics making, etc. [0003] CO in tail gas of chemical synthesis gas desulfurization u...

AI Technical Summary

Problems solved by technology

[0003] CO in tail gas of chemical synthesis gas desulfurization unit 2 The concentration is relatively high, generally greater than 80%, and it is suitable for conventional low-temperature rectification or pressure swing adsorption process for purification, but this process enters CO 2 The gas flow of the compressor contains nearly 20% non-condensable gas, that is, impurities, which increases the loss of electric energy, and an adsorber needs to be installed for drying and dehydration. In order to ensure that the moisture content of the system is qualified, the adsorber must be intermittently regenerated and dried , which makes the system complex and increases the power consumption of the system, and the molecular sieve adsorbent used also needs to be replaced regularly, which increases the discharge of waste residue in the system

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