KR102720647B1 - Carbon dioxide capture process processing method with improved capture and purity - Google Patents

Abstract

One embodiment of the present invention relates to a carbon dioxide capture process treatment method in which carbon dioxide is extracted/captured from an input gas using an adsorbent and a vacuum pump, wherein an adsorption tower including a plurality of adsorption beds is arranged in multiple stages and the movement path of the gas is controlled to improve the capture rate and purity of carbon dioxide.

Description

{CARBON DIOXIDE CAPTURE PROCESS PROCESSING METHOD WITH IMPROVED CAPTURE AND PURITY}

The examples below relate to a carbon dioxide capture process treatment method in which carbon dioxide is extracted/captured from an input gas using an adsorbent and a vacuum pump, and in which an adsorption tower including a plurality of adsorption beds is arranged in multiple stages and the movement path of the gas is controlled to improve the capture rate and purity of carbon dioxide.

Hydrogen is attracting attention as a clean energy source that does not emit carbon dioxide or other environmental pollutants, and accordingly, the number of hydrogen production plants is increasing.

Hydrogen can be produced through natural gas reforming, of which steam methane reforming (SMR) is a process in which methane reacts with steam to produce hydrogen-rich synthesis gas.

Within the SMR, methane is converted to hydrogen and carbon monoxide, and in a water-gas shift reactor, carbon monoxide reacts with water to produce hydrogen and carbon dioxide to prevent CO poisoning and increase the amount of hydrogen produced.

Afterwards, moisture is removed from the flash drum and H2 is separated in a pressure swing adsorption (PSA) facility to produce H2.

Off-gases (carbon dioxide and other impurity gases) generated at this time are released into the atmosphere or captured/stored separately.

The method of producing hydrogen while releasing off-gas into the atmosphere is called gray hydrogen production, and the method of producing hydrogen while capturing/storing CO2 gas is called blue hydrogen production.

If the carbon dioxide generated during the hydrogen production process is released into the atmosphere as is, the meaning of using hydrogen as a clean energy source will fade, so it is necessary to capture carbon dioxide.

Captured carbon dioxide can be landfilled or utilized in various industries.

Carbon dioxide capture is generally based on a Vacuum Pressure Swing Adsorption (VPSA) system. The VPSA system operates by passing gas (air, etc.) through an adsorbent that adsorbs carbon dioxide, and then using a vacuum pump to desorb and capture carbon dioxide from the adsorbent.

KR 10-2260269 B KR 10-2466732 B KR 10-2016777 B

The problem to be solved by one embodiment of the present invention is to provide a carbon dioxide capture system having improved capture degree (capture amount) and purity (carbon dioxide concentration) of carbon dioxide compared to the conventional VPSA system described above, and a carbon dioxide capture process treatment method having improved capture degree and purity for controlling the system.

According to one embodiment, a method for processing a carbon dioxide capture process with improved capture degree and purity, which controls a carbon dioxide capture system with improved capture degree and purity, is provided, comprising: a capture step of capturing and purifying carbon dioxide from an input gas; a compression step of compressing and liquefying a gas discharged in the capture step; and a storage step of storing a fluid discharged in the compression step.

In addition, the carbon dioxide capture system having improved capture efficiency and purity includes: a capture unit for capturing and purifying carbon dioxide from an input gas; a compression unit for compressing and liquefying gas discharged from the capture unit; and a storage unit for storing fluid discharged from the compression unit; wherein the capture unit includes: a first adsorption tower having a predetermined carbon dioxide adsorbent accommodated therein; a first vacuum pump for forming a vacuum in the first adsorption tower to suck gas from the adsorbent; a first buffer tank for storing gas discharged from the first vacuum pump; a second adsorption tower having a predetermined carbon dioxide adsorbent accommodated therein; a second vacuum pump for forming a vacuum in the second adsorption tower to suck gas from the adsorbent; a second buffer tank for storing gas discharged from the second vacuum pump; a third adsorption tower having a predetermined carbon dioxide adsorbent accommodated therein; a third vacuum pump for forming a vacuum in the third adsorption tower to suck gas from the adsorbent; And a third buffer tank storing the gas discharged from the third vacuum pump; wherein each of the first to third adsorption towers includes: four adsorption beds, namely, a first adsorption bed, a second adsorption bed, a third adsorption bed, and a fourth adsorption bed, and in the capturing step, the first to fourth adsorption beds may alternately perform: an adsorption process for adsorbing carbon dioxide onto an adsorbent by passing gas therethrough; a pressure equalization process for removing impure gases inside and increasing pressure; a desorption/exhaust process for feeding back gas desorbed from the adsorbent based on a vacuum pump; a desorption/storage process for supplying gas desorbed from the adsorbent based on a vacuum pump to a buffer tank; and an atmosphere process for increasing the internal pressure based on an input gas; according to a predetermined cycle.

And, the cycle comprises: a first step of performing an adsorption process in the first adsorption bed and the second adsorption bed and performing a pressure equalization process in the third adsorption bed and the fourth adsorption bed; a second step of performing an adsorption process in the first adsorption bed and the second adsorption bed, performing an atmospheric process in the third adsorption bed, and performing a desorption/exhaust process in the fourth adsorption bed; a third step of performing an adsorption process in the first adsorption bed and the second adsorption bed, performing an atmospheric process in the third adsorption bed, and performing a desorption/storage process in the fourth adsorption bed; a fourth step of performing an adsorption process in the first adsorption bed and the third adsorption bed and performing a pressure equalization process in the second adsorption bed and the fourth adsorption bed; a fifth step of performing an adsorption process in the first adsorption bed and the third adsorption bed, performing an atmospheric process in the fourth adsorption bed, and performing a desorption/exhaust process in the second adsorption bed; A sixth step of performing an adsorption process in the first adsorption bed and the third adsorption bed, performing an atmospheric process in the fourth adsorption bed, and performing a desorption storage process in the second adsorption bed; A seventh step of performing an adsorption process in the third adsorption bed and the fourth adsorption bed, and performing a pressure equalization process in the first adsorption bed and the second adsorption bed; An eighth step of performing an adsorption process in the third adsorption bed and the fourth adsorption bed, performing an atmospheric process in the second adsorption bed, and performing a desorption/exhaust process in the first adsorption bed; A ninth step of performing an adsorption process in the third adsorption bed and the fourth adsorption bed, performing an atmospheric process in the second adsorption bed, and performing a desorption/storage process in the first adsorption bed; A tenth step of performing an adsorption process in the second adsorption bed and the fourth adsorption bed, and performing a pressure equalization process in the first adsorption bed and the third adsorption bed; It may include an 11th step of performing an adsorption process in the second adsorption bed and the fourth adsorption bed, performing an atmospheric process in the first adsorption bed, and performing a desorption/exhaust process in the third adsorption bed; and a 12th step of performing an adsorption process in the second adsorption bed and the fourth adsorption bed, performing an atmospheric process in the first adsorption bed, and performing a desorption/storage process in the third adsorption bed.

In addition, the capturing unit includes: a path of a gas flowing through the capturing unit is formed in a first mode or a second mode, and the compression unit includes: a compressor that compresses a gas discharged from the capturing unit; and a chilling unit that liquefies the gas discharged from the compressor; and the first mode includes: a 1-1 path that supplies the input gas to the first adsorption tower; a 1-2 path that exhausts the gas discharged from the first adsorption tower for a 1-1 hour period; a 1-3 path that supplies the gas discharged from the first adsorption tower by the first vacuum pump to the first buffer tank after the 1-1 hour period; a 1-4 path that supplies the gas stored in the first buffer tank to the second adsorption tower; a 1-5 path that exhausts the gas discharged from the second adsorption tower for a 1-2 hour period. After the 1-2 hour period, a 1-6 path for supplying the gas discharged from the 2nd adsorption tower by the 2nd vacuum pump to the 2nd buffer tank; a 1-7 path for supplying the gas stored in the 2nd buffer tank to the 3rd adsorption tower; a 1-8 path for exhausting the gas discharged from the 3rd adsorption tower for 1-3 hours; a 1-9 path for supplying the gas discharged from the 3rd adsorption tower by the 3rd vacuum pump to the 3rd buffer tank after the 1-3 hour period; and a 1-10 path for supplying the gas stored in the 3rd buffer tank to the compression unit; wherein the 2nd mode comprises: a 2-1 path for supplying the input gas to the 1st adsorption tower; a 2-2 path for supplying the gas discharged from the 1st adsorption tower for 2-1 hours to the 2nd adsorption tower; After the 2-1 hour, a 2-3 path for supplying the gas discharged from the first adsorption tower for a 2-2 hour period by the first vacuum pump to the first buffer tank; a 2-4 path for supplying the gas discharged from the second adsorption tower for a 2-2 hour period by the third adsorption tower; a 2-5 path for supplying the gas discharged from the second adsorption tower for a 2-2 hour period by the second vacuum pump to the second buffer tank; a 2-6 path for exhausting the gas discharged from the third adsorption tower for a 2-3 hour period by the third vacuum pump; a 2-7 path for supplying the gas discharged from the third adsorption tower for a 2-3 hour period by the third vacuum pump to the third buffer tank; And a 2-8 path for supplying the gas stored in the first buffer tank to the third buffer tank to the compression unit; wherein the 1-3 path includes: a 1-3-1 path for feeding back the gas discharged from the first adsorption tower by the first vacuum pump for 1-4 hours as the input gas; and a 1-3-2 path for supplying the gas discharged from the first adsorption tower by the first vacuum pump to the first buffer tank after the 1-4 hours; and wherein the 1-6 path includes: a 1-6-1 path for feeding back the gas discharged from the second adsorption tower by the second vacuum pump for 1-5 hours as the input gas. And after the 1-5 hour, a 1-6-2 path for supplying the gas discharged from the second adsorption tower by the second vacuum pump to the second buffer tank; and the 1-9 path includes: a 1-9-1 path for feeding back the gas discharged from the third adsorption tower by the third vacuum pump to the input gas during the 1-6 hour; and a 1-9-2 path for supplying the gas discharged from the third adsorption tower by the third vacuum pump to the third buffer tank after the 1-6 hour; and the 2-3 path includes: a 2-3-1 path for feeding back the gas discharged from the first adsorption tower by the first vacuum pump to the input gas during the 2-4 hour; And after the 2-4th hour, a 2-3-2 path for supplying the gas discharged from the first adsorption tower by the first vacuum pump to the first buffer tank; and the 2-5th path includes: a 2-5-1 path for feeding back the gas discharged from the second adsorption tower by the second vacuum pump to the input gas during the 2-5th hour; and a 2-5-2 path for supplying the gas discharged from the second adsorption tower by the second vacuum pump to the second buffer tank after the 2-5th hour; and the 2-7th path includes: a 2-7-1 path for feeding back the gas discharged from the third adsorption tower by the third vacuum pump to the input gas during the 2-6th hour. And after the 2-6 hour, a 2-7-2 path for supplying the gas discharged from the third adsorption tower by the third vacuum pump to the third buffer tank; wherein the 1-4 path includes: a 1-4-1 path for feeding back the gas discharged from the upper portion of the first buffer tank as the input gas; and a 1-4-2 path for supplying the gas discharged from the lower portion of the first buffer tank to the second adsorption tower; wherein the 1-7 path includes: a 1-7-1 path for feeding back the gas discharged from the upper portion of the second buffer tank as the input gas; and a 1-7-2 path for supplying the gas discharged from the lower portion of the second buffer tank to the third adsorption tower; and wherein the 1-10 path includes: a 1-10-1 path for feeding back the gas discharged from the upper portion of the third buffer tank as the input gas; And a 1-10-2 path for supplying gas discharged from the lower portion of the third buffer tank to the compression unit; and the 2-8 path may include: a 2-8-1 path for feeding back gas discharged from the upper portions of the first to third buffer tanks as the input gas; and a 2-8-2 path for supplying gas discharged from the lower portions of the first to third buffer tanks to the compression unit.

In addition, the valve system comprises: a first input valve provided in a conduit for supplying the input gas to the first adsorption bed; a second input valve provided in a conduit for supplying the input gas to the second adsorption bed; a third input valve provided in a conduit for supplying the input gas to the third adsorption bed; a fourth input valve provided in a conduit for supplying the input gas to the fourth adsorption bed; a first dynamic pressure valve provided in a conduit for connecting the first adsorption bed to another adsorption bed; a second dynamic pressure valve provided in a conduit for connecting the second adsorption bed to another adsorption bed; a third dynamic pressure valve provided in a conduit for connecting the third adsorption bed to another adsorption bed; a fourth dynamic pressure valve provided in a conduit for connecting the fourth adsorption bed to another adsorption bed; a first discharge valve provided in a conduit for discharging gas from the first adsorption bed; a second discharge valve provided in a conduit for discharging gas from the second adsorption bed; A third discharge valve provided in a conduit through which gas is discharged from the third adsorption bed; A fourth discharge valve provided in a conduit through which gas is discharged from the fourth adsorption bed; A first vacuum valve provided in an input conduit of the first vacuum pump, the second vacuum pump, the third vacuum pump, and the fourth vacuum pump; A second vacuum valve provided in one discharge conduit of the first vacuum pump, the second vacuum pump, the third vacuum pump, and the fourth vacuum pump; A second vacuum valve provided in another discharge conduit of the first vacuum pump, the second vacuum pump, the third vacuum pump, and the fourth vacuum pump; A first vent valve provided in a conduit through which gas is exhausted from the first adsorption bed; A second vent valve provided in a conduit through which gas is exhausted from the second adsorption bed; A third vent valve provided in a conduit through which gas is exhausted from the third adsorption bed; and a fourth vent valve provided in a conduit through which gas is exhausted from the fourth adsorption bed.

In one embodiment, it is possible to capture the maximum amount of carbon dioxide from the input gas (a system having a higher capture rate than conventional VPSA can be configured).

In addition, the carbon dioxide purity (concentration) of the discharged gas (captured gas) can be improved.

In addition, by alternately using multiple adsorption beds included in one adsorption tower for different processes, carbon dioxide capture can be performed continuously without interruption.

In addition, by changing the control order of the modes or valves within the same system, it is possible to configure different types of multi-stage structures, thereby selecting a mode/control method more suitable to the characteristics/environment of the area/facility where carbon dioxide is captured.

Additionally, separation of impurity gases from the adsorbent can be promoted by applying a predetermined gas shock to the adsorbent.

Figure 1 is a drawing showing a conventional SMR hydrogen production system.
Figure 2 is a drawing showing a conventional carbon dioxide capture system (VPSA).
FIG. 3 is a schematic diagram showing a carbon dioxide capture system with improved capture rate and purity according to one embodiment of the present invention.
FIG. 4 is a drawing showing a first mode of a carbon dioxide capture system with improved capture rate and purity according to one embodiment of the present invention.
FIG. 5 is a drawing showing a second mode of a carbon dioxide capture system with improved capture rate and purity according to one embodiment of the present invention.
FIG. 6 is a drawing showing an example of feeding back gas from a vacuum pump in a first mode of a carbon dioxide capture system with improved capture rate and purity according to one embodiment of the present invention.
FIG. 7 is a drawing showing an example of feeding back gas from a vacuum pump in a second mode of a carbon dioxide capture system with improved capture rate and purity according to one embodiment of the present invention.
FIG. 8 is a drawing showing an example of feeding back gas from a buffer tank in a first mode of a carbon dioxide capture system with improved capture rate and purity according to one embodiment of the present invention.
FIG. 9 is a drawing showing an example of feeding back gas from a buffer tank in a second mode of a carbon dioxide capture system with improved capture rate and purity according to one embodiment of the present invention.
Figure 10 is a flow chart showing a carbon dioxide capture process treatment method with improved capture rate and purity according to one embodiment of the present invention.
FIG. 11 is a diagram showing a cycle of a carbon dioxide capture process treatment method with improved capture rate and purity according to one embodiment of the present invention.
FIGS. 12 to 23 are drawings showing the open/close state of a valve and a gas path according to a cycle of a carbon dioxide capture process treatment method with improved capture rate and purity according to one embodiment of the present invention.
FIG. 24 is a drawing showing an air feedback structure of a carbon dioxide capture process treatment system with improved capture rate and purity according to one embodiment of the present invention.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. However, since various modifications may be made to the embodiments, the scope of the patent application rights is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, or substitutes to the embodiments are included in the scope of the rights.

Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, the embodiments are not limited to specific disclosed forms, and the scope of the present disclosure includes modifications, equivalents, or alternatives included in the technical idea.

Although the terms first or second may be used to describe various components, such terms should be construed only for the purpose of distinguishing one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

When it is said that a component is "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but there may also be other components in between.

The terms used in the examples are for the purpose of description only and should not be construed as limiting. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, the terms "comprises" or "has" and the like are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood to not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments belong. Terms defined in commonly used dictionaries, such as those defined in common usage dictionaries, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless expressly defined in this application.

In addition, when describing with reference to the attached drawings, the same components will be given the same reference numerals regardless of the drawing numbers, and redundant descriptions thereof will be omitted. When describing an embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted.

According to one embodiment, a carbon dioxide capture system with improved capture efficiency and purity is provided, which includes a capture unit (1) for capturing and purifying carbon dioxide from an input gas; a compression unit (2) for compressing and liquefying gas discharged from the capture unit (1); and a storage unit (3) for storing fluid discharged from the compression unit (2).

The above capturing unit (1) may be equipped with a plurality of adsorption towers.

The above capturing unit (1) is equipped with a predetermined heat exchanger to remove moisture (H2O) contained in the input gas and then supply the input gas from which moisture has been removed to the adsorption tower.

In the above compression unit (2), the discharged/captured carbon dioxide is compressed and liquefied.

The above storage unit (3) stores carbon dioxide in a liquid state.

In addition, the capturing unit (1) comprises: a first adsorption tower (11) having a predetermined carbon dioxide adsorbent accommodated therein; a first vacuum pump (111) for forming a vacuum in the first adsorption tower (11) to suck gas from the adsorbent; a first buffer tank (112) for storing gas discharged from the first vacuum pump (111); a second adsorption tower (12) having a predetermined carbon dioxide adsorbent accommodated therein; a second vacuum pump (121) for forming a vacuum in the second adsorption tower (12) to suck gas from the adsorbent; a second buffer tank (122) for storing gas discharged from the second vacuum pump (121); a third adsorption tower (13) having a predetermined carbon dioxide adsorbent accommodated therein; a third vacuum pump (131) for forming a vacuum in the third adsorption tower (13) to suck gas from the adsorbent; And a third buffer tank (132) storing the gas discharged from the third vacuum pump (131); wherein the path of the gas flowing through the capturing unit (1) is formed in a first mode or a second mode, and the compression unit (2) includes: a compressor (21) for compressing the gas discharged from the capturing unit (1); and a chilling unit (22) for liquefying the gas discharged from the compressor (21); and the first mode includes: a 1-1 path (P101) for supplying the input gas to the first adsorption tower (11); a 1-2 path (P102) for exhausting the gas discharged from the first adsorption tower (11) for a 1-1 hour period; a 1-3 path (P103) for supplying the gas discharged from the first adsorption tower (11) by the first vacuum pump (111) after the 1-1 hour period to the first buffer tank (112). A 1-4 path (P104) for supplying gas stored in the first buffer tank (112) to the second adsorption tower (12); A 1-5 path (P105) for exhausting gas discharged from the second adsorption tower (12) for 1-2 hours; A 1-6 path (P106) for supplying gas discharged from the second adsorption tower (12) by the second vacuum pump (121) after the 1-2 hours to the second buffer tank (122); A 1-7 path (P107) for supplying gas stored in the second buffer tank (122) to the third adsorption tower (13); A 1-8 path (P108) for exhausting gas discharged from the third adsorption tower (13) for 1-3 hours; A 1-9 path (P109) for supplying gas discharged from the third adsorption tower (13) by the third vacuum pump (131) to the third buffer tank (132) after the 1-3 hour period; and a 1-10 path (P110) for supplying gas stored in the third buffer tank (132) to the compression unit (2); wherein the second mode comprises: a 2-1 path (P201) for supplying the input gas to the first adsorption tower (11); a 2-2 path (P202) for supplying gas discharged from the first adsorption tower (11) for a 2-1 hour period to the second adsorption tower (12); a 2-3 path (P203) for supplying gas discharged from the first adsorption tower (11) by the first vacuum pump (111) after the 2-1 hour period to the first buffer tank (112); A 2-4 path (P204) for supplying gas discharged from the second adsorption tower (12) for 2-2 hours to the third adsorption tower (13); A 2-5 path (P205) for supplying gas discharged from the second adsorption tower (12) for 2-2 hours by the second vacuum pump (121) to the second buffer tank (122); A 2-6 path (P206) for exhausting gas discharged from the third adsorption tower (13) for 2-3 hours; A 2-7 path (P207) for supplying gas discharged from the third adsorption tower (13) for 2-3 hours by the third vacuum pump (131) to the third buffer tank (132); and may include a 2-8 path (P208) for supplying gas stored in the first buffer tank (112) to the third buffer tank (132) to the compression unit (2).

The term 'time' described in the description of the present invention may be a fixed time specified according to an embodiment, and in some embodiments, may be a variable time calculated based on a gas detection sensor or a gas concentration sensor placed on one side of a pipe. For example, an embodiment in which 'time' is terminated/closed when the carbon dioxide concentration is 80% or higher is also possible.

The above capturing unit (1) may be equipped with three adsorption towers, as shown in Fig. 3.

Each of the three adsorption towers is equipped with a carbon dioxide adsorbent on the inside.

An embodiment in which the first vacuum pump (111), the second vacuum pump (121), and the third vacuum pump (131) are provided individually is also possible, and as shown in FIGS. 12 to 23, an embodiment in which the first vacuum pump (111) to the third vacuum pump (131) are structurally the same devices but are referred to as the first vacuum pump (111) to the third vacuum pump (131) for distinction in the control stage is also possible.

Based on the same structure as described above, the path of gas can be adjusted/controlled in either the first mode or the second mode.

As illustrated in Fig. 4, according to the first mode, gas discharged from one adsorption tower through a vacuum pump is first stored in a buffer tank and then supplied to another adsorption tower.

As illustrated in Fig. 5, according to the second mode, in the process of passing input gas through an adsorption tower to adsorb carbon dioxide, the exhaust gas passing through the adsorption tower is not discharged into the air but is supplied again to another adsorption tower.

At this time, the first buffer tank (112), the second buffer tank (122), and the third buffer tank (132) may be configured as a single buffer tank according to an embodiment, and in an embodiment in which the individual first buffer tanks (112), the second buffer tanks (122), and the third buffer tanks (132) are provided, a conduit connecting from the lower part of the first buffer tank (112) to the upper part of the second buffer tank (122), a conduit connecting from the lower part of the second buffer tank (122) to the upper part of the third buffer tank (132), and a conduit discharged from the lower part of the third buffer tank (132) toward the storage unit (3) may be provided.

The above compression unit (2) includes: a compressor (21) that compresses gas discharged from the capturing unit (1); and a chilling unit (22) that liquefies gas discharged from the compressor (21), thereby compressing and liquefying (cooling) carbon dioxide.

Below, the first mode is described in detail with reference to Fig. 4.

The input gas (Feed Gas) is supplied to the first adsorption tower (11) placed first (1-1 path (P101)).

The supplied input gas passes through the adsorbent contained inside the first adsorption tower (11) and is exhausted (vented) from the first adsorption tower (11) with components such as carbon dioxide removed (1-2 path (P102)).

After a certain period of time (1-1 hour) has elapsed to ensure that carbon dioxide is sufficiently adsorbed onto the adsorbent, the valve on the exhaust side is closed and gas containing carbon dioxide is sucked from inside the first adsorption tower (11) by the first vacuum pump (111) (1-3 path (P103)).

The gas supplied to the first buffer tank (112) according to the 1-3 route (P103) may contain certain impure gases, and thus the purity (concentration) of carbon dioxide may be low (it may be at the same level as the purity of carbon dioxide captured in a conventional VPSA system).

Thereafter, the gas inside the first buffer tank (112) is supplied to the second adsorption tower (12) placed second, and the adsorption process is performed again. In addition, the gas passing through the second buffer tank (122) is supplied to the third adsorption tower (13) placed third, and the adsorption process is performed again.

Accordingly, the purity of carbon dioxide can be greatly increased.

By performing this adsorption process over a total of three stages (Path 1-4 (P104) to Path 1-10 (P110)), the purity of carbon dioxide can be significantly improved compared to the prior art.

Below, the second mode is described in detail with reference to Fig. 5.

The input gas (Feed Gas) is supplied to the first adsorption tower (11) placed first (2-1 path (P201)).

The supplied input gas passes through the adsorbent accommodated inside the first adsorption tower (11) and is discharged from the first adsorption tower (11) with components such as carbon dioxide removed, and the discharged exhaust gas is not discharged into the air but is supplied to the second adsorption tower (12) placed next (2-2 path (P202)).

After a certain period of time (2-1 hour) has elapsed to ensure that carbon dioxide is sufficiently adsorbed into the adsorbent, the valve on the exhaust side is closed and gas containing carbon dioxide is sucked from inside the first adsorption tower (11) by the first vacuum pump (111) (2-3 path (P203)).

The gas desorbed from the first adsorption tower (11) in this way is stored in the first buffer tank (112). Thereafter, the stored gas passes through the second buffer tank (122) and the third buffer tank (132), where the carbon dioxide purity is improved, and is then delivered to the compressor.

When carbon dioxide is captured from the exhaust gas delivered to the second adsorption tower (12), the exhaust gas is supplied to the third adsorption tower (13). The gas desorbed by the vacuum pump in the second adsorption tower (12) is temporarily stored in the second buffer tank (122), and then passes through the third buffer tank (132) to improve the carbon dioxide purity and is then delivered to the compressor.

When carbon dioxide is captured from the exhaust gas delivered to the third adsorption tower (132), the remaining gas is exhausted to the outside air. The gas desorbed through the vacuum pump in the third adsorption tower (132) is stored in the third buffer tank (132) and then delivered to the compressor.

In this way, by sequentially passing the input gas through the adsorption towers arranged in multiple stages, the capture rate and purity of carbon dioxide can be improved.

And, the 1-3 path (P103) includes: a 1-3-1 path (P1031) for feeding back the gas discharged from the first adsorption tower (11) by the first vacuum pump (111) for 1-4 hours as the input gas; and a 1-3-2 path (P1032) for supplying the gas discharged from the first adsorption tower (11) by the first vacuum pump (111) to the first buffer tank (112) after the 1-4 hours; and the 1-6 path (P106) includes: a 1-6-1 path (P1061) for feeding back the gas discharged from the second adsorption tower (12) by the second vacuum pump (121) for 1-5 hours as the input gas; And after the 1-5th hour, a 1-6-2 path (P1062) for supplying the gas discharged from the second adsorption tower (12) by the second vacuum pump (121) to the second buffer tank (122); and the 1-9th path (P109) includes: a 1-9-1 path (P1091) for feeding back the gas discharged from the third adsorption tower (13) by the third vacuum pump (131) for the 1-6th hour to the input gas; And after the 1-6th hour, the 1-9-2 path (P1092) for supplying the gas discharged from the 3rd adsorption tower (13) by the 3rd vacuum pump (131) to the 3rd buffer tank (132); and the 2-3rd path (P203) includes: a 2-3-1 path (P2031) for feeding back the gas discharged from the 1st adsorption tower (11) by the 1st vacuum pump (111) for 2-4th hours to the input gas; And after the 2-4th hour, a 2-3-2 path (P2032) for supplying the gas discharged from the first adsorption tower (11) by the first vacuum pump (111) to the first buffer tank (112); and the 2-5th path (P205) includes: a 2-5-1 path (P2051) for feeding back the gas discharged from the second adsorption tower (12) by the second vacuum pump (121) for the 2-5th hour to the input gas; And after the 2-5 hour, a 2-5-2 path (P2052) for supplying the gas discharged from the second adsorption tower (12) by the second vacuum pump (121) to the second buffer tank (122); and the 2-7 path (P207) may include: a 2-7-1 path (P2071) for feeding back the gas discharged from the third adsorption tower (13) by the third vacuum pump (131) for the 2-6 hour as the input gas; and a 2-7-2 path (P2072) for supplying the gas discharged from the third adsorption tower (13) by the third vacuum pump (131) to the third buffer tank (132) after the 2-6 hour.

Hereinafter, as shown in FIGS. 6 and 7, an embodiment is described in which gas discharged (desorbed) from an adsorption tower is sent back to an input gas stage based on a vacuum pump and supplied back to the adsorption tower together with the input gas.

In the process of desorbing gas from the first adsorption tower (11) by operating the first vacuum pump (111) after the above 1-1 hour, gas with low carbon dioxide purity is discharged during the initial part of the time (1-4 hours) of desorbing gas, so it is sent back to the input gas side and mixed with the input gas (1-3-1 path (P1031)).

After 1-4 hours have passed, high purity carbon dioxide gas is discharged and stored in the first buffer tank (112).

In the same manner as described above, feedback paths may also be included in the 1-6 path (P106), the 1-9 path (P109), the 2-3 path (P203), the 2-5 path (P205) and the 2-7 path (P207).

In addition, the 1-4 path (P104) includes: a 1-4-1 path (P1041) that feeds back gas discharged from the upper portion of the first buffer tank (112) as the input gas; and a 1-4-2 path (P1042) that supplies gas discharged from the lower portion of the first buffer tank (112) to the second adsorption tower (12); and the 1-7 path (P107) includes: a 1-7-1 path (P1071) that feeds back gas discharged from the upper portion of the second buffer tank (122) as the input gas; And a 1-7-2 path (P1072) for supplying gas discharged from the lower portion of the second buffer tank (122) to the third adsorption tower (13); and the 1-10 path (P110) includes: a 1-10-1 path (P1101) for feeding back gas discharged from the upper portion of the third buffer tank (132) as the input gas; and a 1-10-2 path (P1102) for supplying gas discharged from the lower portion of the third buffer tank (132) to the compression unit (2); and the 2-8 path (P208) includes: a 2-8-1 path (P2081) for feeding back gas discharged from the upper portions of the first buffer tank (112) to the third buffer tank (132) as the input gas; and may include a 2-8-2 path (P2082) for supplying gas discharged from the lower portion of the first buffer tank (112) to the third buffer tank (132) to the compression unit (2).

Hereinafter, as illustrated in FIGS. 8 and 9, an embodiment is described in which a portion of the gas stored in the buffer tank is sent back to the input gas stage and supplied back to the adsorption tower together with the input gas.

Buffer tanks are designed in different sizes depending on their storage capacity, but are generally manufactured to have a length (height) of 5 m or more.

Since the CO2 component with a relatively high density among the gases flowing into the buffer tank gathers at the bottom of the buffer tank, a CO2 purity gradient in the length (height) direction occurs within the buffer tank.

More specifically, even if the CO2 purity at the bottom of the buffer tank is 99.9%, the CO2 purity in the upper region is formed at around 80%, so the low-purity CO2 gas formed at the top can be discharged (Vent) and joined to the pipeline (pipe line) through which the input gas flows in.

Accordingly, the carbon dioxide purity can be increased from the existing 70% to over 95%, and the CO2 recovery rate (capture rate; capture amount) can also be improved from 60% to 85%.

This buffer tank feedback can be applied individually or in combination with the vacuum pump feedback described above.

For this configuration, separate pipes can be connected to the upper and lower sides of each buffer tank.

In the 1-4-1 path (P1041) that feeds back the gas discharged from the upper portion of the first buffer tank (112) to the input gas, gas with low carbon dioxide purity is discharged and supplied (feedback) to the input gas pipe.

Alternatively, a gas having a low carbon dioxide purity may be exhausted as illustrated in FIGS. 8 and 9.

In the 1-4-2 path (P1042) that supplies the gas discharged from the lower portion of the first buffer tank (112) to the second adsorption tower (12), gas with high carbon dioxide purity is discharged and supplied to the next buffer tank or compression unit (2).

In addition, each of the first to third adsorption towers (11) to (13) includes: four adsorption beds, namely, a first adsorption bed (B1), a second adsorption bed (B2), a third adsorption bed (B3), and a fourth adsorption bed (B4), and the valve system includes: a first input valve (KV01) provided in a conduit for supplying the input gas to the first adsorption bed (B1); a second input valve (KV02) provided in a conduit for supplying the input gas to the second adsorption bed (B2); a third input valve (KV03) provided in a conduit for supplying the input gas to the third adsorption bed (B3); a fourth input valve (KV04) provided in a conduit for supplying the input gas to the fourth adsorption bed (B4); a first pressure-dynamic valve (KV9) provided in a conduit for connecting the first adsorption bed (B1) to another adsorption bed; A second dynamic pressure valve (KV10) provided in a conduit connecting the second adsorption bed (B2) to another adsorption bed; A third dynamic pressure valve (KV11) provided in a conduit connecting the third adsorption bed (B3) to another adsorption bed; A fourth dynamic pressure valve (KV12) provided in a conduit connecting the fourth adsorption bed (B4) to another adsorption bed; A first discharge valve (KV5) provided in a conduit through which gas is discharged from the first adsorption bed (B1); A second discharge valve (KV6) provided in a conduit through which gas is discharged from the second adsorption bed (B2); A third discharge valve (KV7) provided in a conduit through which gas is discharged from the third adsorption bed (B3); A fourth discharge valve (KV8) provided in a conduit through which gas is discharged from the fourth adsorption bed (B4); A first vacuum valve (KV15) provided in an input pipe (41) of the first vacuum pump (111), the second vacuum pump (121), the third vacuum pump (131), and the fourth vacuum pump; A second vacuum valve (KV16) provided in one discharge pipe of the first vacuum pump (111), the second vacuum pump (121), the third vacuum pump (131), and the fourth vacuum pump; A second vacuum valve (KV16) provided in another discharge pipe of the first vacuum pump (111), the second vacuum pump (121), the third vacuum pump (131), and the fourth vacuum pump; A first vent valve (PV01) provided in a pipe through which gas is exhausted from the first adsorption bed (B1); A second vent valve (PV02) provided in a pipe through which gas is exhausted from the second adsorption bed (B2); It may include a third vent valve (PV03) provided in a conduit through which gas is exhausted from the third adsorption bed (B3); and a fourth vent valve (PV04) provided in a conduit through which gas is exhausted from the fourth adsorption bed (B4).

The above valve system can be automatically opened and closed based on a predetermined electronic control means.

Each of the first to third adsorption towers (11) to (13) includes four adsorption beds: a first adsorption bed (B1), a second adsorption bed (B2), a third adsorption bed (B3), and a fourth adsorption bed (B4).

In other words, a carbon dioxide capture system with improved capture efficiency and purity according to one embodiment is equipped with a total of 12 adsorption beds (3 adsorption towers X 4 adsorption beds each).

The above adsorption bed forms a sealed space from the outside, and an adsorbent is accommodated inside.

Figures 12 to 23 illustrate the connection structure of the valve system.

Among the valves, the valves marked in white are open, and the valves marked in black are closed.

The input gas is supplied to some of the four adsorption beds, and for this purpose, only some of the first input valve (KV01) to the fourth input valve (KV04) can be opened and the rest can be closed.

The adsorption beds are connected to each other to exchange gases with each other and the pressure can be controlled (dynamic pressure). For this purpose, the first dynamic pressure valve (KV9) to the fourth dynamic pressure valve (KV12) are provided.

For example, if the first pressure-dynamic valve (KV9) and the fourth pressure-dynamic valve (KV12) are opened, the first adsorption bed (B1) and the fourth adsorption bed (B4) are connected to each other so that the pressures of the adsorption beds are adjusted to the same level (pressure equalization process), and impure gases remaining in the adsorption beds temporarily move to other adsorption beds.

The input gases input into the above adsorption bed pass through the inside of the adsorption bed, come into contact with the adsorbent, and can then be exhausted or fed back through the rear end of the vent valve.

When no exhaust gas is produced, the vent valve is blocked.

An adsorption bed in which carbon dioxide is sufficiently adsorbed is connected to a vacuum pump and a discharge valve is provided to suck up carbon dioxide (gas).

The above discharge valve is opened only when gas must be sucked in from the vacuum pump, and when the discharge valve is opened, the input valve and vent valve connected to the adsorption bed are blocked.

The above vacuum pump can feed back the gas sucked from the adsorption bed to the input gas line (first vacuum valve (KV15)) or supply the gas to the buffer tank (second vacuum valve (KV16)).

Here, the term 'vacuum valve' used in the description of the present invention is a term used to distinguish a valve connected to the operation of a vacuum pump.

And, the 1-4-1 path (P1041), the 1-7-1 path (P1071), the 1-10-1 path (P1101) and the 2-8-1 path (P2081) are: supplied to the collecting unit (1) by combining the input gas and the feedback gas based on a predetermined air feedback structure, wherein the air feedback structure comprises: an input conduit (41) through which the input gas flows in; a first axial fan (42) arranged on one side of the input conduit (41); a feedback conduit (43) through which the feedback gas flows in; a second axial fan (44) arranged on one side of the feedback conduit (43); a centrifugal fan (45) that discharges the gas flowing in from the input conduit (41) and the feedback conduit (43); And a gas shock generating unit that applies a predetermined gas shock to one side of the input pipe (41); wherein the gas shock generating unit comprises: a first cylinder (461) having a first inner diameter that receives a portion of the gas flowing in from the feedback pipe (43); a first piston (462) arranged inside the first cylinder (461); a separation shaft having one end fixed to an end of the first piston (462); a second piston (463) fixed to the other end of the separation shaft; a second cylinder (464) that accommodates the second piston (463) and is formed to have a second inner diameter smaller than the first inner diameter; a shock pipe (465) that connects the second cylinder (464) and the input pipe (41); a nozzle that injects a predetermined fuel into the inside of the first cylinder (461); And an ignition plug that generates a predetermined spark inside the first cylinder (461); based on an explosion that occurs in the space between the first cylinder (461) and the first piston (462), the second piston (463) pushes gas inside the second cylinder (464), thereby applying a predetermined gas shock to the input pipe (41).

The term 'feedback' used in the description of the present invention refers to a portion of gas discharged/exhausted from a conduit of an adsorption bed being re-injected into an input gas conduit and mixed with new input gas.

For this feedback, an air feedback structure of the type shown in Fig. 24 can be provided to mix and transport gases coming from various directions in one direction by combining a centrifugal fan (45) and an axial fan.

At this time, by accelerating the instantaneous velocity of the input gas supplied to the adsorption bed, some of the impure gas adsorbed on the adsorbent by the dynamic pressure can be induced to be removed again and exhausted.

Since the carbon dioxide contained in the input gases supplied later is adsorbed again on the adsorbent, the proportion of carbon dioxide among the gases attached to the adsorbent can be increased.

In the above gas shock generating section, the first piston (462) rapidly transferred by the explosion pressurizes the air accommodated between the first cylinder (461) and the second cylinder (464) while the second piston (463) is transferred, and the second piston (463) pushes out the air accommodated at the rear end of the second cylinder (464) and inside the shock conduit (465) to generate a predetermined gas shock in the input conduit (41).

According to one embodiment, a method for processing a carbon dioxide capture process with improved capture degree and purity, which controls a carbon dioxide capture system with improved capture degree and purity, is provided, comprising: a capture step (S100) of capturing and purifying carbon dioxide from an input gas; a compression step (S200) of compressing and liquefying gas discharged in the capture step (S100); and a storage step (S300) of storing fluid discharged in the compression step (S200).

The above capturing step (S100) can be performed/processed by the above-described capturing unit (1), the above-described compression step (S200) can be performed/processed by the above-described compression unit (2), and the above-described storage step (S300) can be performed/processed by the above-described storage unit (3).

In addition, the carbon dioxide capture system with improved capture rate and purity includes: a capture unit (1) for capturing and purifying carbon dioxide from an input gas; a compression unit (2) for compressing and liquefying gas discharged from the capture unit (1); and a storage unit (3) for storing fluid discharged from the compression unit (2); wherein the capture unit (1) includes: a first adsorption tower (11) having a predetermined carbon dioxide adsorbent accommodated therein; a first vacuum pump (111) for forming a vacuum in the first adsorption tower (11) to suck gas from the adsorbent; a first buffer tank (112) for storing gas discharged from the first vacuum pump (111); a second adsorption tower (12) having a predetermined carbon dioxide adsorbent accommodated therein; a second vacuum pump (121) for forming a vacuum in the second adsorption tower (12) to suck gas from the adsorbent; a second buffer tank (122) for storing gas discharged from the second vacuum pump (121). A third adsorption tower (13) having a predetermined carbon dioxide adsorbent accommodated therein; a third vacuum pump (131) forming a vacuum in the third adsorption tower (13) to suck gas from the adsorbent; and a third buffer tank (132) storing gas discharged from the third vacuum pump (131); wherein each of the first to third adsorption towers (11) to (13) comprises: four adsorption beds, namely, a first adsorption bed (B1), a second adsorption bed (B2), a third adsorption bed (B3), and a fourth adsorption bed (B4), and in the capturing step (S100), the first to fourth adsorption beds (B1) to (B4) perform: an adsorption process (Adsorption; Ads) of passing gas therein to adsorb carbon dioxide onto the adsorbent; a pressure equalization process (Pressure Equalization; PEQ) of removing impure gases inside and increasing pressure; An evacuation purge process (Evac Purge) that feeds back gas desorbed from an adsorbent using a vacuum pump; an evacuation storage process (Evac Storage) that supplies gas desorbed from an adsorbent to a buffer tank using a vacuum pump; and a standby process (Stby) that increases internal pressure using an input gas can be alternately performed according to a predetermined cycle.

The above first to fourth adsorption beds (B1) can perform an adsorption process, a pressure equalization process, a desorption/exhaust process, a desorption/storage process, and an atmosphere process, respectively.

And, the cycle comprises: a first step of performing an adsorption process in the first adsorption bed (B1) and the second adsorption bed (B2) and performing a pressure equalization process in the third adsorption bed (B3) and the fourth adsorption bed (B4); a second step of performing an adsorption process in the first adsorption bed (B1) and the second adsorption bed (B2), performing an atmospheric process in the third adsorption bed (B3), and performing a desorption/exhaust process in the fourth adsorption bed (B4); a third step of performing an adsorption process in the first adsorption bed (B1) and the second adsorption bed (B2), performing an atmospheric process in the third adsorption bed (B3), and performing a desorption/storage process in the fourth adsorption bed (B4); a fourth step of performing an adsorption process in the first adsorption bed (B1) and the third adsorption bed (B3), and performing a pressure equalization process in the second adsorption bed (B2) and the fourth adsorption bed (B4); A fifth step of performing an adsorption process in the first adsorption bed (B1) and the third adsorption bed (B3), performing an atmospheric process in the fourth adsorption bed (B4), and performing a desorption/exhaust process in the second adsorption bed (B2); A sixth step of performing an adsorption process in the first adsorption bed (B1) and the third adsorption bed (B3), performing an atmospheric process in the fourth adsorption bed (B4), and performing a desorption/storage process in the second adsorption bed (B2); A seventh step of performing an adsorption process in the third adsorption bed (B3) and the fourth adsorption bed (B4), and performing a pressure equalization process in the first adsorption bed (B1) and the second adsorption bed (B2); An eighth step of performing an adsorption process in the third adsorption bed (B3) and the fourth adsorption bed (B4), performing an atmospheric process in the second adsorption bed (B2), and performing a desorption/exhaust process in the first adsorption bed (B1); It may include a ninth step of performing an adsorption process in the third adsorption bed (B3) and the fourth adsorption bed (B4), performing an atmospheric process in the second adsorption bed (B2), and performing a desorption storage process in the first adsorption bed (B1); a tenth step of performing an adsorption process in the second adsorption bed (B2) and the fourth adsorption bed (B4), and performing a pressure equalization process in the first adsorption bed (B1) and the third adsorption bed (B3); an eleventh step of performing an adsorption process in the second adsorption bed (B2) and the fourth adsorption bed (B4), performing an atmospheric process in the first adsorption bed (B1), and performing a desorption/exhaust process in the third adsorption bed (B3); and a twelfth step of performing an adsorption process in the second adsorption bed (B2) and the fourth adsorption bed (B4), performing an atmospheric process in the first adsorption bed (B1), and performing a desorption/exhaust process in the third adsorption bed (B3).

The above cycle can be configured as shown in Fig. 11.

In other words, you can perform Step 1 for 60 seconds, Step 2 for 30 seconds, Step 3 for 150 seconds, Step 4 for 60 seconds, Step 5 for 30 seconds, Step 6 for 150 seconds, Step 7 for 60 seconds, Step 8 for 30 seconds, Step 9 for 150 seconds, Step 10 for 60 seconds, Step 11 for 30 seconds, Step 12 for 150 seconds, and then perform Step 1 again.

The above adsorption beds are operated simultaneously and perform different processes, thereby enabling carbon dioxide capture to be performed continuously without interruption.

FIG. 12 illustrates a valve state and a gas flow path in the first stage, FIG. 13 illustrates a valve state and a gas flow path in the second stage, FIG. 14 illustrates a valve state and a gas flow path in the third stage, FIG. 15 illustrates a valve state and a gas flow path in the fourth stage, FIG. 16 illustrates a valve state and a gas flow path in the fifth stage, FIG. 17 illustrates a valve state and a gas flow path in the sixth stage, FIG. 18 illustrates a valve state and a gas flow path in the seventh stage, FIG. 19 illustrates a valve state and a gas flow path in the eighth stage, FIG. 20 illustrates a valve state and a gas flow path in the ninth stage, FIG. 21 illustrates a valve state and a gas flow path in the tenth stage, FIG. 22 illustrates a valve state and a gas flow path in the eleventh stage, and FIG. 23 illustrates a valve state and a gas flow path in the twelfth stage.

Although the embodiments have been described with limited drawings as described above, those skilled in the art can apply various technical modifications and variations based on the above. For example, even if the described techniques are performed in a different order than the described method, and/or the components of the described system, structure, device, circuit, etc. are combined or combined in a different form than the described method, or are replaced or substituted by other components or equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are also included in the scope of the claims described below.

1: Capture section
11: 1st adsorption tower
111: 1st vacuum pump
112: 1st buffer tank
12: 2nd adsorption tower
121: 2nd vacuum pump
122: Second buffer tank
13: 3rd absorption tower
131: 3rd vacuum pump
132: Third Buffer Tank
2: Compression section
21 : Compressor
22: Chilling Unit
3: Storage
P101: Route 1-1
P102: Route 1-2
P103: Route 1-3
P1031: Route 1-3-1
P1032: Route 1-3-2
P104: Route 1-4
P1041: Route 1-4-1
P1042: Route 1-4-2
P105: Route 1-5
P106: Route 1-6
P1061: Route 1-6-1
P1062: Route 1-6-2
P107: Route 1-7
P1071: Route 1-7-1
P1072: Route 1-7-2
P108: Route 1-8
P109: Route 1-9
P1091: Route 1-9-1
P1092: Route 1-9-2
P110: Route 1-10
P1101: Route 1-10-1
P1102: Route 1-10-2
P201: Route 2-1
P202 : Route 2-2
P203: Route 2-3
P2031: Route 2-3-1
P2032: Route 2-3-2
P204 : Route 2-4
P205: Route 2-5
P2051: Route 2-5-1
P2052: Route 2-5-2
P206: Route 2-6
P207: Route 2-7
P2071: Route 2-7-1
P2072: Route 2-7-2
P208: Route 2-8
P2081: Route 2-8-1
P2082: Route 2-8-2
41 : Input line
42: 1st axial fan
43: Feedback channel
44: Second axial fan
45: Centrifugal fan
461 : Cylinder 1
462: 1st piston
463: 2nd piston
464 : Cylinder 2
465 : Shock duct
S100: Capture stage
S200: Compression stage
S300: Save Step
B1: 1st adsorption bed
B2: Second adsorption bed
B3: Third absorption bed
B4: 4th absorption bed
B1: 1st adsorption bed
B2: Second adsorption bed
B3: Third absorption bed
B4: 4th absorption bed
KV01: 1st input valve
KV02: 2nd input valve
KV03 : 3rd input valve
KV04 : 4th input valve
KV9: 1st pressure relief valve
KV10: 2nd dynamic pressure valve
KV11: 3rd pressure relief valve
KV12: 4th dynamic pressure valve
KV5: 1st discharge valve
KV6: Second discharge valve
KV7: 3rd discharge valve
KV8: 4th discharge valve
KV15: 1st vacuum valve
KV16: Second vacuum valve
PV01: 1st vent valve
PV02: 2nd vent valve
PV03: 3rd vent valve
PV04: 4th vent valve

Claims (3)

In a method for processing a carbon dioxide capture process with improved capture efficiency and purity, which controls a carbon dioxide capture system with improved capture efficiency and purity,
A capture step for capturing and purifying carbon dioxide from an input gas;
A compression step for compressing and liquefying the gas discharged in the above capturing step; and
A storage step for storing the fluid discharged in the above compression step;
The carbon dioxide capture system with improved capture and purity is:
A capture unit for capturing and purifying carbon dioxide from input gas;
A compression unit that compresses and liquefies the gas discharged from the above capturing unit; and
A storage unit for storing the fluid discharged from the compression unit is included;
The above capturing part:
A first adsorption tower having a predetermined carbon dioxide adsorbent contained therein;
A first vacuum pump that forms a vacuum in the first adsorption tower and sucks gas from the adsorbent;
A first buffer tank for storing gas discharged from the first vacuum pump;
A second adsorption tower having a predetermined amount of carbon dioxide adsorbent contained therein;
A second vacuum pump that forms a vacuum in the second adsorption tower and sucks gas from the adsorbent;
A second buffer tank for storing gas discharged from the second vacuum pump;
A third adsorption tower having a predetermined amount of carbon dioxide adsorbent contained therein;
A third vacuum pump that forms a vacuum in the third adsorption tower to suck gas from the adsorbent; and
A third buffer tank for storing gas discharged from the third vacuum pump;
Each of the first to third adsorption towers:
It comprises four adsorption beds, namely, a first adsorption bed, a second adsorption bed, a third adsorption bed and a fourth adsorption bed,
In the above capturing step, the first to fourth adsorption beds:
An adsorption process that adsorbs carbon dioxide onto an adsorbent by passing gas through it;
Pressure equalization process that removes impure gases inside and increases pressure;
A desorption/exhaust process that feeds back the gas desorbed from the adsorbent using a vacuum pump;
A desorption storage process that supplies gas desorbed from an adsorbent to a buffer tank based on a vacuum pump; and
An atmospheric process that increases the internal pressure based on the input gas; is performed alternately according to a predetermined cycle.
Method for processing carbon dioxide capture process with improved capture rate and purity In claim 1,
The above cycle is:
A first step of performing an adsorption process in the first adsorption bed and the second adsorption bed and performing a pressure equalization process in the third adsorption bed and the fourth adsorption bed;
A second step of performing an adsorption process in the first adsorption bed and the second adsorption bed, performing an atmospheric process in the third adsorption bed, and performing a desorption/exhaust process in the fourth adsorption bed;
A third step of performing an adsorption process in the first adsorption bed and the second adsorption bed, performing a waiting process in the third adsorption bed, and performing a desorption storage process in the fourth adsorption bed;
A fourth step of performing an adsorption process in the first adsorption bed and the third adsorption bed and performing a pressure equalization process in the second adsorption bed and the fourth adsorption bed;
A fifth step of performing an adsorption process in the first and third adsorption beds, performing an atmospheric process in the fourth adsorption bed, and performing a desorption/exhaust process in the second adsorption bed;
A sixth step of performing an adsorption process in the first and third adsorption beds, performing a waiting process in the fourth adsorption bed, and performing a desorption storage process in the second adsorption bed;
A seventh step of performing an adsorption process in the third and fourth adsorption beds and performing a pressure equalization process in the first and second adsorption beds;
An eighth step of performing an adsorption process in the third and fourth adsorption beds, performing an atmospheric process in the second adsorption bed, and performing a desorption/exhaust process in the first adsorption bed;
A ninth step of performing an adsorption process in the third and fourth adsorption beds, performing a waiting process in the second adsorption bed, and performing a desorption storage process in the first adsorption bed;
A tenth step of performing an adsorption process in the second adsorption bed and the fourth adsorption bed and performing a pressure equalization process in the first adsorption bed and the third adsorption bed;
An 11th step of performing an adsorption process in the second adsorption bed and the fourth adsorption bed, performing an atmospheric process in the first adsorption bed, and performing a desorption/exhaust process in the third adsorption bed; and
A 12th step comprising: performing an adsorption process in the second adsorption bed and the fourth adsorption bed, performing an atmospheric process in the first adsorption bed, and performing a desorption storage process in the third adsorption bed;
Carbon dioxide capture process treatment method with improved capture rate and purity delete