CN-116322939-B - Regeneration device, gas treatment device, regeneration method, and gas treatment method

CN116322939BCN 116322939 BCN116322939 BCN 116322939BCN-116322939-B

Abstract

The regenerating device is a device for regenerating the treatment liquid by heating the treatment liquid in a phase-separated state by absorbing the acidic compound to release the acidic compound. The regeneration device includes a container for containing the treatment liquid, and a first wall portion for partitioning a space in the container into a first space and a second space. The first space includes a heating region that receives the processing liquid supplied from the outside of the container and is provided with a heating portion that heats the processing liquid, and a rest region that receives the processing liquid from the heating region after the acidic compound is released by heating by the heating portion. The second space is a space capable of discharging the treatment liquid after releasing the acidic compound. An opening is formed in the first wall portion to allow the treatment liquid in the standing area to flow into the second space.

Inventors

Former Tian Jixiu
An Benqi
SHIGEHISA TAKUO
NAKANISHI KEN
SHIMIZU KUNIHIKO

Assignees

株式会社神户制钢所

Dates

Publication Date: 20260512
Application Date: 20210902
Priority Date: 20201005

Claims (11)

1. A regenerating device for regenerating a treatment liquid in a phase-separated state by absorbing an acidic compound by heating the treatment liquid so as to release the acidic compound, comprising: A container for containing the treatment liquid, and A first wall portion dividing a space in the container into a first space and a second space, wherein, The container is a transverse tank, The first space includes a heating region that receives the processing liquid in a phase-separated state supplied from the outside of the container and is provided with a heating portion that heats the processing liquid in a phase-separated state, and a rest region that is located laterally of the heating region and adjacent to the second space and receives the processing liquid from the heating region after the acidic compound is released by heating of the heating portion and the processing liquid in a phase-separated state, In the heating region, the treatment liquid is stirred by the released bubbles of the acidic compound or the jet of the treatment liquid, in the standing region, the treatment liquid is hardly stirred, The second space is a space capable of discharging the treatment liquid after releasing the acidic compound to the outside of the container, The treatment liquid in a phase separation state includes a first liquid phase portion, and a second liquid phase portion, the acidic compound having a lower content than the first liquid phase portion and a lower specific gravity than the first liquid phase portion, The treatment liquid after releasing the acidic compound is located between the first liquid phase portion and the second liquid phase portion in the standing area, In the first wall portion, an opening is formed at a position where the treatment liquid, which is in the standing area and releases the acidic compound, flows into the second space.
2. The regeneration device according to claim 1, wherein: the first wall part is vertically arranged at the bottom of the container, The opening is formed in a central portion in a height direction in the first wall portion or a portion located on the bottom side with respect to the central portion.
3. The regeneration device according to claim 2, characterized in that: The opening is formed at a lowermost portion in the height direction in the first wall portion.
4. The regeneration device according to claim 1, wherein: the first wall part is vertically arranged at the bottom of the container, The opening is formed in a portion of the first wall portion on an upper end side with respect to a central portion in a height direction.
5. The regeneration device according to claim 1, characterized by further comprising: a treatment liquid supply unit configured to supply the treatment liquid to the heating region, The treatment liquid supply portion is disposed on a bottom side or a top side of the container.
6. The regeneration device according to claim 5, wherein: The heating part comprises a heat transfer tube for flowing a heating medium for heat exchange with the processing liquid and arranged in the heating area, The treatment liquid supply portion is provided with a supply port for supplying the treatment liquid to the heat transfer pipe.
7. The regeneration device according to claim 1, characterized by further comprising: a second wall portion that separates the second space and a third space in the container, The second wall portion is provided upright at the bottom of the container, and includes an upper end that overflows the liquid from the second space to the third space.
8. The reproduction apparatus according to claim 7, characterized by further comprising: And a return path for returning the liquid from the third space to the first space.
9. A gas processing apparatus, characterized by comprising: An absorption device for bringing a gas to be treated into contact with a treatment liquid to absorb an acidic compound contained in the gas to be treated, and The regeneration device of any one of claims 1 to 8.
10. A regeneration method characterized by comprising the steps of: preparing a container as a transverse tank; supplying a treatment liquid in a phase separated state by absorbing an acidic compound to a first space inside the container; releasing the acidic compound from the treatment liquid by heating a heating region of the treatment liquid supplied to the first space in the first space, and Temporarily retaining the treatment liquid after releasing the acidic compound and the treatment liquid in a phase-separated state in a standing area located laterally to the heating area in the first space, and then allowing the treatment liquid after releasing the acidic compound to flow from the first space into the second space through an opening formed in a wall portion that separates the first space and the second space, In the heating region, the treatment liquid is stirred by the released bubbles of the acidic compound or the jet of the treatment liquid, in the standing region, the treatment liquid is hardly stirred, The treatment liquid in a phase separation state includes a first liquid phase portion, and a second liquid phase portion, the acidic compound having a lower content than the first liquid phase portion and a lower specific gravity than the first liquid phase portion, The treatment liquid after releasing the acidic compound is located between the first liquid phase portion and the second liquid phase portion in the standing area.
11. A gas treatment method characterized by comprising the steps of: Separating a treatment liquid by bringing a treatment gas containing an acidic compound into contact with the treatment liquid in an absorption device and allowing the treatment liquid to absorb the acidic compound; delivering the treated liquid after phase separation from the absorption device to a regeneration device, and The regeneration method according to claim 10 is carried out in the regeneration apparatus, and the treatment liquid from which the acidic compound is released is withdrawn from the regeneration apparatus and returned to the absorption apparatus.

Description

Regeneration device, gas treatment device, regeneration method, and gas treatment method Technical Field The present invention relates to a regeneration device, a gas treatment device, a regeneration method, and a gas treatment method. Background Conventionally, a technique for separating an acidic compound by bringing a gas to be treated containing the acidic compound into contact with a treatment liquid has been known. As such a technique, for example, as described in non-patent document 1 below, a technique is known in which a liquid phase is separated into a first phase portion (for example, an amine phase) having a high content of an acidic compound and a second phase portion (for example, an ether phase) having a low content of an acidic compound. The gas treatment apparatus described in non-patent document 2 includes an absorber for absorbing an acidic compound in a gas to be treated by a treatment liquid, a regenerator for separating the acidic compound from the treatment liquid by heating, and a circulation path for introducing the treatment liquid from the absorber to the regenerator and for returning the treatment liquid from the regenerator to the absorber. In this apparatus, the treatment liquid separated in the absorber is supplied to the regenerator without being separated into two liquids, a first phase portion and a second phase portion. In this way, by supplying the phase separation liquid to the regenerator without separating the phase separation liquid into two liquids, the contact area between the first phase portion and the second phase portion is increased, thereby promoting the regeneration of the treatment liquid (the release of the acidic compound). The regeneration promotion of the treatment liquid by increasing the contact area between the first phase portion (for example, amine phase) and the second phase portion (for example, ether phase) will be described below with respect to the extraction of the regenerated amine by the second phase portion. In the phase separation liquid, the acidic compound is mostly present in the first phase portion. Specifically, when the acidic compound is CO 2 and the treatment liquid is primary amine, the acidic compound exists in the form of RNH 3++RNHCOO- or the like in the first phase portion. If these are heated, they are separated into regenerated amine (RNH 2) and CO 2 by a reaction such as RNH 3++RNHCOO-→2RNH2+CO2, thereby realizing regeneration of the treatment solution. At this time, the regenerated amine is extracted to the second phase portion. Accordingly, the separation reaction in the first phase portion tends to proceed rightward in the above reaction formula, and CO 2 is easily released. Such extraction of the regenerated amine by the second phase portion is performed at the liquid-liquid interface between the first phase portion and the second phase portion, and thus the release of CO 2 can be promoted by increasing the contact area thereof. In non-patent document 2, the discharge of the acidic compound can be promoted by increasing the contact interface between the first phase portion and the second phase portion by supplying the phase-separated treatment liquid to the regenerator without separating the treatment liquid into two liquids. However, in non-patent document 2, there is a possibility that the regenerated treatment liquid is mixed in a phase-separated state before regeneration when the regenerated treatment liquid is returned from the regenerator to the absorber, and there is room for improvement in this point. Non-patent literature 1：Hiroshi Machida et al.,"Development of phase separation solvent for CO2 capture by aqueous(amine+ether)solution",Journal of Chemical Thermodynamics,( m), elsevier ltd, 2017, vol.113, p.64-70 Non-patent literature 2：Hiroshi Machida et al.,"Low temperature swing process for CO2 absorption-desorption using phase separation CO2 capture solvent",International Journal of Greenhouse Gas Control,( m), elsevier ltd, 2018, vol.75, p.1-7 Disclosure of Invention The present invention aims to provide a regeneration device and a regeneration method capable of promoting the release of an acidic compound and selectively extracting a regenerated treatment liquid, a gas treatment device provided with the regeneration device, and a gas treatment method for implementing the regeneration method. A regenerating device according to an aspect of the present invention is a device for regenerating a treatment liquid in a phase-separated state by absorbing an acidic compound by heating the treatment liquid to release the acidic compound. The regeneration device includes a container for storing the treatment liquid, and a first wall for dividing a space in the container into a first space and a second space. The first space includes a heating region that receives the processing liquid supplied from the outside of the container and is provided with a heating portion that heats the processing liquid, and a rest region th