Device and method for capturing and recovering carbon dioxide in flue gas

Abstract

The invention provides a device and method for capturing and recovering carbon dioxide in flue gas. The device comprises a flue gas treatment system, a first membrane separation unit, a second membrane separation unit and a high-pressure energy recovery device, wherein the flue gas treatment system is provided with a treatment inlet and a treatment outlet and used for treating the flue gas; the first membrane separation unit is provided with a first gas inlet, a first carbon dioxide enriched gas outlet and a first high-pressure impermeable gas outlet, and the first gas inlet is connected withthe treatment outlet; the second membrane separation unit is provided with a second gas inlet, a carbon dioxide product gas outlet and a second high-pressure impermeable gas outlet, and the second gasinlet is connected with the first carbon dioxide enriched gas outlet; the high-pressure energy recovery device is connected with the first high-pressure impermeable gas outlet and used for recoveringpressure energy of the high-pressure gas produced by the first high-pressure impermeable gas outlet. The device provided by the invention can capture CO2 in recovered flue gas more effectively.

Description

technical field [0001] The invention relates to the technical field of gas recovery, in particular to a device and method for capturing and recovering carbon dioxide in flue gas. Background technique [0002] Global warming is one of the major environmental problems in the world at present. Among the various greenhouse gases that cause climate change, CO 2 The biggest impact on global warming, control CO 2 Emission has become one of the important technical routes to deal with climate warming. CO produced by human activities 2 The largest part of emissions comes from coal-fired power generation, and the CO in the combustion tail gas of coal-fired power plants 2 The emission has the characteristics of low concentration, stability, concentration and large volume, and is a large-scale CO emission reduction 2 one of the best fields. [0003] high purity CO 2 It is an important industrial gas, and the separated and captured CO 2 Not only can it be injected into oil and natu...

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a device and method for capturing and recovering carbon dioxide in flue gas, so as to solve the problem of using membrane separation method in the prior art to capture and recover CO in the flue gas of coal-fired power plants. 2 The problems of low enrichment degree, complex process, poor membrane separation efficiency and energy waste

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