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KR-102965079-B1 - Gas treatment system

KR102965079B1KR 102965079 B1KR102965079 B1KR 102965079B1KR-102965079-B1

Abstract

A gas treatment system is a gas treatment system for separating carbon dioxide from a gas to be treated that includes carbon dioxide, and comprises: a first unit including one or more first compressors for pressurizing the gas to be treated and a first separator for separating the gas to be treated, which is pressurized by one or more first compressors, into a first gas having a higher concentration of carbon dioxide than the gas to be treated and a second gas having a lower concentration of carbon dioxide than the gas to be treated; a second unit including one or more second compressors for pressurizing the first gas and a second separator for separating the first gas, which is pressurized by one or more second compressors, into a third gas having a higher concentration of carbon dioxide than the first gas and a fourth gas having a lower concentration of carbon dioxide than the first gas; and an expander for recovering kinetic energy from the second gas and the fourth gas and transferring the recovered kinetic energy to any one of the one or more first compressors and one or more second compressors.

Inventors

  • 야스다, 게이고

Assignees

  • 후지 덴키 가부시키가이샤

Dates

Publication Date
20260513
Application Date
20220725
Priority Date
20210804

Claims (5)

  1. As a gas treatment system for separating carbon dioxide from a target gas containing carbon dioxide, A first unit comprising a plurality of first compressors connected in series and pressurizing the gas to be treated, and a first separator that separates the gas to be treated, pressurized by the plurality of first compressors, into a first gas having a carbon dioxide concentration higher than that of the gas to be treated and a second gas having a carbon dioxide concentration lower than that of the gas to be treated; A second unit comprising one or more second compressors for pressurizing the first gas, and a second separator for separating the first gas pressurized by the one or more second compressors into a third gas having a higher concentration of carbon dioxide than the first gas and a fourth gas having a lower concentration of carbon dioxide than the first gas, and An expander that recovers power from the second gas and the fourth gas and transmits the recovered power to any one of the plurality of first compressors. Equipped with, The above-mentioned expander is coaxially connected to the first compressor with the largest compression work among the plurality of first compressors, in a gas processing system.
  2. In paragraph 1, A gas treatment system comprising a first separator that separates the first gas by passing the first gas through the gas to be treated, which is pressurized by the plurality of first compressors.
  3. In paragraph 1 or 2, A gas treatment system comprising a second separator that separates the third gas by passing the third gas through the first gas.
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Description

Gas treatment system [0001] The present disclosure relates to a gas treatment system. [0002] Exhaust gas or natural gas generated by burning objects such as fossil fuels contains carbon dioxide. Various technologies have been proposed to separate carbon dioxide from exhaust gas or natural gas, which is the target gas for treatment. Patent Document 1 discloses a membrane-type system for separating carbon dioxide from natural gas, which mainly contains methane and carbon dioxide, using a membrane. Patent Document 2 discloses an adsorption-type system for separating carbon dioxide contained in exhaust gas using an adsorbent such as polyamine. [0007] FIG. 1 is a drawing showing an example of the configuration of a gas treatment system (1A) according to one embodiment of the present disclosure. FIG. 2 is a drawing showing an example of the configuration of a separator (110). FIG. 3 is a diagram showing an example of the configuration of a gas treatment system (1B) according to a modified example (2). FIG. 4 is a diagram showing an example of the configuration of a gas treatment system (1C) according to a modified example (3). [0008] 1. Embodiments FIG. 1 is a diagram showing an example of the configuration of a gas treatment system (1A) according to one embodiment of the present disclosure. The gas treatment system (1A) is a gas treatment system that separates carbon dioxide from a gas to be treated (GA) containing carbon dioxide. The gas to be treated (GA) of this embodiment is exhaust gas generated by burning fossil fuels such as coal, petroleum, or natural gas. More specifically, the gas to be treated (GA) in this embodiment is exhaust gas obtained by removing soot, nitrogen oxides, and sulfur oxides from gas generated by thermal power generation in a thermal power plant. As shown in FIG. 1, the gas treatment system (1A) comprises a gas treatment unit (10), a gas treatment unit (20), and an expander (40). As shown in FIG. 1, the gas treatment unit (20) is connected in series with the gas treatment unit (10). [0009] A gas to be treated (GA) is supplied to a gas treatment unit (10). As shown in FIG. 1, the gas treatment unit (10) is equipped with a compressor (100A) and a compressor (100B) and a separator (110). As shown in FIG. 1, in the gas treatment unit (10), the compressor (100A), the compressor (100B), and the separator (110) are connected in series in this order. Each of the compressor (100A) and the compressor (100B) is an example of a first compressor in the present disclosure. The separator (110) is an example of a first separator in the present disclosure. The gas treatment unit (10) is an example of a first unit in the present disclosure. [0010] A compressor (100A) is a fluid machine that pressurizes supplied gas by the rotational motion of an impeller or rotor or the reciprocating motion of a piston. A gas to be treated (GA) is supplied to the compressor (100A). By pressurizing by the compressor (100A), the volume of the gas to be treated (GA) is reduced, and the pressure of the gas to be treated (GA) is increased. The kinetic energy that drives the impeller, rotor, or piston in the compressor (100A) is provided from a power source, such as an electric motor connected to the compressor (100A). Additionally, although details will be described later, in this embodiment, the kinetic energy that drives the impeller, rotor, or piston in the compressor (100A) is also provided from an expander (40). [0011] The gas to be treated (GA) compressed by the compressor (100A) is supplied to the compressor (100B). The compressor (100B) is a fluid machine that pressurizes the supplied gas by the rotational motion of an impeller or rotor or the reciprocating motion of a piston, just like the compressor (100A). In the following, when there is no need to distinguish between the compressor (100B) and the compressor (100A), the compressor (100A) and the compressor (100B) may be referred to as the compressor (100). Since the gas to be treated (GA) compressed by the compressor (100A) is supplied to the compressor (100B), the volume of the compressor (100B) may be smaller than the volume of the compressor (100A). By compression by the compressor (100B), the volume of the gas to be treated (GA) is further reduced, and the pressure of the gas to be treated (GA) is further increased. The kinetic energy required for compressing the gas to be processed (GA) in the compressor (100B) is supplied from a power source, such as an electric motor connected to the compressor (100B). [0012] A gas to be treated (GA) compressed by a compressor (100B) is supplied to the separator (110). FIG. 2 is a diagram showing an example of the configuration of the separator (110). As shown in FIG. 2, the separator (110) is equipped with a membrane (110a) for separating carbon dioxide from the gas to be treated (GA) compressed by the compressor (100B). The membrane (110a) has the property of selectively permeating carbon dioxide. That is, the separator