JP2022161050A - Carbon dioxide separation recovery device, and operation method of the same - Google Patents

Abstract

To provide a carbon dioxide separation recovery device capable of stably recovering carbon dioxide having high purity over a long time.SOLUTION: A carbon dioxide separation recovery device includes: a carbon dioxide separator which is provided in the middle of a carbon dioxide-containing gas supply passage, and separates carbon dioxide by a separation membrane; a pressure reducing pump for reducing a pressure on a permeation side of the separation membrane through a first recovery gas flow passage; a plurality of adsorbers which are filled with an adsorbent for adsorbing carbon dioxide contained in the carbon dioxide-containing gas not permeating through the separation membrane, and alternately repeat an adsorption step and a reproduction step so that the other performs the reproduction step while one performs the adsorption step; a recovery pump for reducing the pressure of the adsorber through a second recovery gas passage, and recovering carbon dioxide from the adsorbent; and a controller for controlling capability of the pressure reducing pump according to accumulation operation time of the recovery pump.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present disclosure relates to carbon dioxide capture devices and methods of operating the same.

Patent Literature 1 discloses a carbon dioxide separation and recovery apparatus in which a carbon dioxide separator provided with a carbon dioxide separation membrane and a PSA type carbon dioxide adsorption apparatus having a plurality of adsorbers are combined.

This carbon dioxide separation and recovery apparatus introduces a carbon dioxide-containing gas with a carbon dioxide concentration of 3 to 75% into a carbon dioxide separator, and produces a first recovery gas with a carbon dioxide concentration of 80% or more on the permeate side of the separation membrane. At the same time, the carbon dioxide concentration of the carbon dioxide-containing gas discharged from the carbon dioxide separator without permeating the separation membrane is reduced to 3 to 15%.

Next, the carbon dioxide-containing gas having a carbon dioxide concentration of 3 to 15% is introduced into the adsorber of the adsorption step of the carbon dioxide adsorption device, and after being adsorbed by the adsorbent of the adsorber of the adsorption step, the gas is removed from the adsorbent in the regeneration step. A second recovery gas having a desorbed carbon dioxide concentration of 80% or more is generated, and an exhaust gas having a carbon dioxide concentration of 2% or less discharged from the adsorber without being adsorbed by the adsorbent of the adsorber in the adsorption step. It is what causes it.

WO2012/153808

The present disclosure provides a carbon dioxide separation and recovery apparatus capable of stably recovering high-purity carbon dioxide over a long period of time.

The carbon dioxide separation and recovery apparatus according to the present disclosure includes a carbon dioxide-containing gas supply channel, a carbon dioxide separator, a decompression pump, a first recovery gas channel, a plurality of adsorbers, an exhaust gas channel, and a recovery A pump, a second recovery gas flow path, a plurality of on-off valves, and a controller are provided.

The carbon dioxide-containing gas supply channel is a channel configured to allow a carbon dioxide-containing gas containing at least carbon dioxide to flow.

The carbon dioxide separator comprises a first space interposed in the middle of the carbon dioxide-containing gas supply channel, a separation membrane configured to selectively permeate and separate carbon dioxide contained in the carbon dioxide-containing gas, It has a first space and a second space separated by a separation membrane.

The decompression pump is configured to reduce the pressure in the second space and recover the first recovery gas composed of carbon dioxide that has permeated the separation membrane and moved from the first space to the second space.

The first collected gas flow path is a flow path that connects the second space and the decompression pump, and when the decompression pump operates, the second space is decompressed and the first collected gas flows into the flow path. It is a channel that communicates the second space with the suction port of the decompression pump so that the decompression pump can recover the decompression pump.

The plurality of adsorbers are filled with an adsorbent so as to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply channel without permeating the separation membrane, and the carbon dioxide is It is connected to the carbon dioxide-containing gas supply channel on the downstream side of the carbon separator via the first channel switching valve.

The exhaust gas flow path has a second flow switching valve on the downstream side of the plurality of adsorbers so that the carbon dioxide-containing gas supplied to the adsorber that has not been adsorbed by the adsorber can be exhausted to the outside. connected through

The recovery pump is configured to depressurize the adsorber and recover a second recovery gas consisting of carbon dioxide desorbed from the adsorbent.

The second recovery gas channel is a channel that connects the plurality of adsorbers and the recovery pump, and the second recovery gas flows into the channel when the recovery pump operates and the adsorber is decompressed. The vicinity of the inflow port of the carbon dioxide-containing gas in the plurality of adsorbers and the suction port of the recovery pump are communicated so that the carbon dioxide-containing gas is recovered by the recovery pump as soon as possible.

The plurality of on-off valves are valves that individually open and close a plurality of branched flow paths branched corresponding to the plurality of adsorbers in the second recovered gas flow path, and the carbon dioxide-containing gas is supplied to the corresponding adsorbers. , and open when the corresponding adsorber is depressurized to desorb carbon dioxide from the adsorbent.

A controller is configured to control the vacuum pump and the recovery pump to recover a first recovered gas from the carbon dioxide separator and a second recovered gas from the adsorber.

Further, the controller causes the at least one adsorber to perform an adsorption step of causing the adsorbent to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply channel, While one adsorber is performing an adsorption step, at least one remaining adsorber is subjected to a regeneration step to desorb carbon dioxide from the adsorbent, each adsorber alternating between adsorption steps and regeneration steps. , the first channel switching valve, the second channel switching valve, and the on-off valve are controlled.

In addition, the controller counts the integrated value of the operation time of the recovery pump, and according to the integrated value, the amount of carbon dioxide-containing gas supplied to the adsorber during the adsorption step is within a predetermined range. It is configured to control at least one of the capacity of the vacuum pump and the duration of the adsorption step.

The carbon dioxide separation and capture device in the present disclosure can keep the amount of carbon dioxide-containing gas supplied to the adsorber within a predetermined range even when the separation membrane deteriorates due to long-term operation. However, even if the amount of impurities permeating the separation membrane increases as the operation time increases, the operation can be performed without reducing the carbon dioxide concentration of the second recovery gas recovered in the regeneration process of the adsorber. .

Therefore, it is possible to provide a carbon dioxide separation and recovery apparatus capable of stably recovering carbon dioxide of high purity over a long period of time.

1 is a block diagram showing the configuration of a carbon dioxide separation and capture device according to Embodiment 1. FIG. 4 is a flow chart showing the operation of the carbon dioxide separation and capture device according to Embodiment 1. FIG. 2 is an explanatory diagram for explaining the gas flow when the adsorber 3a performs the adsorption step and the adsorber 3b performs the regeneration step in the carbon dioxide separation and recovery apparatus of Embodiment 1. FIG. FIG. 2 is an explanatory diagram for explaining the gas flow when the adsorber 3b performs the adsorption step and the adsorber 3a performs the regeneration step in the carbon dioxide separation and recovery apparatus of Embodiment 1. FIG. 4 is a characteristic diagram showing the relationship between the cumulative operating time T1 of the recovery pump 32 and the pressure _Pm of the _first recovery gas flow path 22 detected by the pressure detector 33 in the carbon dioxide separation and recovery apparatus of Embodiment 1. FIG. ₄ is a characteristic diagram showing the relationship between the cumulative operation time T1 of the recovery pump 32 and the predetermined adsorption operation time in the carbon dioxide separation and capture apparatus of Embodiment 1. FIG.

(Knowledge, etc. on which this disclosure is based)
At the time when the inventors came up with the present disclosure, there was a carbon dioxide separation and recovery apparatus that combined a carbon dioxide separator equipped with a carbon dioxide separation membrane and a PSA type carbon dioxide adsorption apparatus having a plurality of adsorbers. rice field.

This carbon dioxide separation and recovery apparatus introduces a carbon dioxide-containing gas with a carbon dioxide concentration of 3 to 75% into a carbon dioxide separator, and produces a first recovery gas with a carbon dioxide concentration of 80% or more on the permeate side of the separation membrane. At the same time, the carbon dioxide concentration of the carbon dioxide-containing gas discharged from the carbon dioxide separator without permeating the separation membrane is reduced to 3 to 15%.

Next, the carbon dioxide-containing gas having a carbon dioxide concentration of 3 to 15% is introduced into the adsorber of the adsorption step of the carbon dioxide adsorption device, and after being adsorbed by the adsorbent of the adsorber of the adsorption step, the gas is removed from the adsorbent in the regeneration step. A second recovery gas having a desorbed carbon dioxide concentration of 80% or more is generated, and an exhaust gas having a carbon dioxide concentration of 2% or less discharged from the adsorber without being adsorbed by the adsorbent of the adsorber in the adsorption step. It is what causes it.

In order to stably utilize the recovered carbon dioxide, this carbon dioxide separation and recovery device is required to discharge carbon dioxide of stable purity in both the first recovered gas and the second recovered gas.

However, when a carbon dioxide separation and capture device using both a carbon dioxide separator and an adsorber is operated for a long time, the separation performance of the separation membrane deteriorates over time due to water wetting of the separation membrane of the carbon dioxide separator and inflow of impurities. As a result, the purity of the first recovered gas decreases and the amount of carbon dioxide-containing gas supplied to the subsequent adsorber decreases, so the concentration of gases other than carbon dioxide in the adsorber relatively increases, desorbing from the adsorber. There is a problem that the purity of the separated second recovery gas is also lowered.

Under such circumstances, the inventors predicted the deterioration of the performance of the separation membrane of the carbon dioxide separator from the integrated value of the amount of carbon dioxide recovered by the carbon dioxide separation and recovery device, and calculated the amount of carbon dioxide-containing gas processed by the carbon dioxide separator. By keeping the (first recovery gas amount) and the carbon dioxide-containing gas supply amount to the adsorber within a predetermined range, carbon dioxide with a stable purity can be obtained from the beginning of operation of the carbon dioxide capture unit to after long-term operation. I got the idea to get it.

Then, the inventors realized the idea, discovered that there was a problem that it was necessary to keep the amount of carbon dioxide supplied to the adsorber within a predetermined range, and in order to solve the problem, have come to form the subject matter of this disclosure.

Therefore, the present disclosure provides a carbon dioxide separation and recovery apparatus capable of stably recovering high-purity carbon dioxide over a long period of time.

Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters or redundant descriptions of substantially the same configurations may be omitted.

It should be noted that the accompanying drawings and the following description are provided to allow those skilled in the art to fully understand the present disclosure and are not intended to limit the claimed subject matter thereby.

(Embodiment 1)
Embodiment 1 will be described below with reference to FIGS. 1 to 6. FIG.

[1-1. Constitution]
As shown in FIG. 1, a carbon dioxide separation and recovery device 400 in the present embodiment includes a carbon dioxide separator 1, adsorbers 3a and 3b, a first flow switching valve 11, a second flow switching valve 12, , on-off valves 13a and 13b, a carbon dioxide-containing gas supply channel 21, a first recovered gas channel 22, a second recovered gas channel 23, an exhaust gas channel 24, a pressure reducing pump 31, and a recovery pump 32 , a pressure sensor 33 and a controller 200 .

The separation membrane 2 partitions the interior of the carbon dioxide separator 1 into a first space and a second space. The adsorbent 4a is filled in the adsorber 3a, and the adsorbent 4b is filled in the adsorber 3b.

Here, the suffixes of the reference numerals of these components will be explained by taking the adsorbers 3a and 3b as an example. 3a is the reference number attached to the first adsorption device, and 3b is the reference number attached to the second adsorption device. When the adsorber 3a among the plurality of adsorbers 3a and 3b is distinguished from others, it will be described as the adsorber 3a. When the adsorber 3b among the plurality of adsorbers 3a and 3b is distinguished from others, it will be described as the adsorber 3b.

When describing a plurality of adsorbers 3a and 3b at the same time and equivalently, they are referred to as adsorbers 3a and 3b. Description will be made with reference to symbols omitting lower-case alphabetic characters.

The carbon dioxide-containing gas supply channel 21 is a channel configured to allow a carbon dioxide-containing gas containing at least carbon dioxide to flow. The carbon dioxide-containing gas supply channel 21 has an upstream end connected to a carbon dioxide-containing gas supply source outside the device, and a downstream end of the channel connected to the first channel switching valve 11 downstream of the carbon dioxide separator 1. are connected to the adsorbers 3a and 3b via the .

The first space of the carbon dioxide separator 1 is a space interposed in the middle of the carbon dioxide-containing gas supply channel 21 . The separation membrane 2 is configured to selectively permeate and separate carbon dioxide contained in the carbon dioxide-containing gas flowing through the carbon dioxide-containing gas supply channel 21 . Separation membrane 2 contains monoethanolamine, which is a type of alkanolamine. The second space of the carbon dioxide separator 1 is a space separated from the first space by the separation membrane 2 .

The decompression pump 31 reduces the pressure in the second space of the carbon dioxide separator 1 by reducing the pressure in the first recovered gas flow path 22, and the carbon dioxide that has permeated the separation membrane 2 and moved from the first space to the second space. configured to recover a first recovery gas consisting of The decompression pump 31 is a pump capable of adjusting the exhaust speed, which exhausts the first collected gas from an exhaust port.

The first collected gas flow path 22 is a flow path that connects the second space and the decompression pump 31, and when the decompression pump 31 operates, the second space is decompressed and the first collected gas is transferred to the first It is a channel that connects the second space and the suction port of the decompression pump 31 so that the collected gas flows into the recovery gas channel 22 and is recovered by the decompression pump 31 .

The plurality (two) of adsorbers 3a and 3b are adapted to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply channel 21 without passing through the separation membrane 2. is filled with adsorbents 4 a and 4 b and is connected to a carbon dioxide-containing gas supply channel 21 on the downstream side of the carbon dioxide separator 1 via a first channel switching valve 11 .

In this embodiment, an amine-based adsorbent in which an amine compound is supported on porous silica is used as the adsorbents 4a and 4b that adsorb carbon dioxide.

The exhaust gas flow path 24 has a plurality of channels so that the gas (carbon dioxide-reduced exhaust gas) that is not adsorbed by the adsorbers 3a and 3b among the carbon dioxide-containing gases supplied to the adsorbers 3a and 3b can be exhausted to the outside. It is connected to the downstream side of the (two) adsorbers 3a and 3b via the second flow path switching valve 12 .

The recovery pump 32 is configured to reduce the pressure in the adsorbers 3a and 3b and recover a second recovery gas composed of carbon dioxide desorbed from the adsorbents 4a and 4b.

The second recovery gas flow path 23 is a flow path that connects a plurality (two) of adsorbers 3a and 3b and a recovery pump 32, and the recovery pump 32 operates to reduce the pressure in the adsorbers 3a and 3b. When the second recovery gas flows into the second recovery gas flow path 23 and is recovered by the recovery pump 32, the inlets of the carbon dioxide-containing gas in the plurality (two) of the adsorbers 3a and 3b are The vicinity and the suction port of the recovery pump 32 are communicated.

The on-off valve 13a is a valve that individually opens and closes the branched flow path branched corresponding to the adsorber 3a in the second recovered gas flow path 23, and is closed when the carbon dioxide-containing gas is supplied to the adsorber 3a. In this state, when the adsorber 3a is decompressed and carbon dioxide is desorbed from the adsorbent 4a, it is in the open state.

The on-off valve 13b is a valve that individually opens and closes the branched flow path branched corresponding to the adsorber 3b in the second recovered gas flow path 23, and is closed when the carbon dioxide-containing gas is supplied to the adsorber 3b. In this state, when the adsorber 3b is decompressed and carbon dioxide is desorbed from the adsorbent 4b, the open state is established.

The pressure detector 33 is provided in the middle of the first collected gas flow path 22 connecting the second space and the decompression pump 31 so as to detect the pressure of the first collected gas in the first collected gas flow path 22. A pressure gauge.

The first recovered gas discharged from the exhaust port of the decompression pump 31 and the second recovered gas discharged from the exhaust port of the recovery pump 32 are combined and supplied to the outside of the apparatus as a carbon dioxide-enriched gas. A carbon dioxide enriched gas flow path is connected to the exhaust port of the pump 31 and the exhaust port of the recovery pump 32 .

Controller 200 controls the operation of carbon dioxide capture device 400 . The controller 200 includes a signal input/output unit (not shown), an arithmetic processing unit (not shown), and a storage unit (not shown) for storing control programs.

The pressure detector 33 , the decompression pump 31 , the recovery pump 32 , the first channel switching valve 11 , the second channel switching valve 12 , and the on-off valve 13 operate according to commands from the controller 200 .

The controller 200 is configured to control the pressure reducing pump 31 and the recovery pump 32 so as to recover the first recovered gas from the carbon dioxide separator 1 and recover the second recovered gas from the adsorbers 3a and 3b. .

In addition, the controller 200 supplies the adsorbent 4 with carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space of the carbon dioxide separator 1 to the carbon dioxide-containing gas supply flow path 21 in at least one adsorber 3 . and causing the at least one remaining adsorber 3 to perform a regeneration step of desorbing carbon dioxide from the adsorbent 4 while at least one adsorber 3 is performing the adsorption step, Each adsorber 3 is configured to control the first channel switching valve 11, the second channel switching valve 12, and the on-off valves 13a and 13b so that the adsorption process and the regeneration process are alternately repeated.

In addition, the controller 200 counts the integrated value of the operation time of the recovery pump 32 or the decompression pump 31, and according to the integrated value, the amount of carbon dioxide-containing gas supplied to the adsorber 3 during the adsorption step reaches a predetermined value. It is configured to control the capacity of the decompression pump 31 and the duration of the adsorption process so as to fall within the range.

[1-2. motion]
The operation of the carbon dioxide separation and recovery apparatus 400 configured as described above will be described in detail with reference to FIGS. 2 to 6. FIG.

FIG. 2 is a flow chart showing the operation of the carbon dioxide capture device 400. As shown in FIG.

FIG. 3 is an explanatory diagram for explaining the gas flow when the adsorber 3a performs the adsorption step and the adsorber 3b performs the regeneration step in the carbon dioxide separation and recovery device 400, and FIG. 4 shows the carbon dioxide separation and recovery device. FIG. 4 is an explanatory diagram for explaining the gas flow when the adsorber 3b performs the adsorption step and the adsorber 3a performs the regeneration step in 400;

The following operations are performed by the controller 200 controlling the carbon dioxide capture device 400, and the membrane separation by the carbon dioxide separator 1 and the adsorption separation operation by the adsorbers 3a and 3b are performed respectively. Therefore, although FIG. 2 shows the operation of the adsorber 3a, the adsorber 3b also operates in the same manner.

That is, as shown in FIG. 3, while the adsorber 3a is performing the adsorption step, the adsorber 3b is performing the regeneration step. Conversely, as shown in FIG. 4, the adsorber 3b is performing the adsorption step. During this time, the adsorber 3a performs a regeneration process. Each adsorber 3 operates so as to alternately repeat an adsorption process and a regeneration process (the state shown in FIG. 3 and the state shown in FIG. 4).

First, the controller 200 confirms whether or not there is an operation start request for the carbon dioxide separation and capture device 400 (S101). As a result of confirmation in S101, if there is no operation start request, S101 is branched to the No side and S101 confirmation is repeated until an operation start request is received.

In S101, when an operation start request is received, S101 is branched to the Yes side to operate the decompression pump 31 (S102).

Next, it is determined whether or not the accumulated operation time T1 of the recovery pump 32 is 20000 hr or _more (S103).

Until the accumulated operation time T1 of the recovery pump 32 reaches 20000 hr, S103 is branched to the No side so that the pressure Pm in the _first recovery gas flow path 22 detected by the pressure detector 33 becomes 10 _kPa . , the capacity of the decompression pump 31 is adjusted.

After the cumulative operation time T1 of the recovery pump 32 reaches 20000 hr, S103 is branched to the Yes side, and the pressure _Pm of the _first recovery gas flow path 22 detected by the pressure detector 33 is (0 .0005T ₁ ) Adjust the capacity of the vacuum pump 31 to achieve kPa.

FIG. 5 is a characteristic diagram showing the relationship between the cumulative operating time T1 of the recovery pump 32 and the pressure _Pm in the _first recovery gas flow path 22 detected by the pressure detector 33 in the carbon dioxide separation and recovery device 400. As shown in FIG.

Here, the target value of the pressure _Pm in the first recovery gas flow path 22 in the present embodiment is ₁₀ kPa until the cumulative operating time T1 of the recovery pump 32 reaches 20000 hr, and after reaching 20000 hr ( 0.0005T ₁ ) kPa, but this is a pressure determined in advance by experiments and is only an example.

Specifically, it is determined by the balance between the flow rate at which the carbon dioxide-containing gas supplied to the carbon dioxide separator 1 permeates the separation membrane 2 and the flow rate supplied to the subsequent adsorber 3 without permeating the separation membrane 2. be done.

There is a correlation between the cumulative operation time T ₁ of the recovery pump 32, that is, the cumulative carbon dioxide-containing gas supply time to the carbon dioxide separator 1 and the carbon dioxide separation performance of the separation membrane 2, and the carbon dioxide separator From the first supply of the carbon dioxide-containing gas to 1 until a certain time, a constant flow rate of the first recovery gas is recovered by constant control.

On the other hand, if the accumulated carbon dioxide-containing gas supply time to the carbon dioxide separator 1 becomes longer, separation may occur due to dissolution of amine contained in the separation membrane 2 or physical destruction due to impurities other than carbon dioxide in the carbon dioxide-containing gas. Since the film thickness of the membrane 2 is reduced (degraded), the flow rate of the carbon dioxide-containing gas permeating through the separation membrane 2 is increased.

At this time, impurities such as nitrogen in the carbon dioxide-containing gas also easily permeate the separation membrane 2, so if the capacity of the decompression pump 31 is constant, the carbon dioxide concentration in the first recovered gas will decrease. At the same time, the flow rate of the carbon dioxide-containing gas supplied to the subsequent adsorber 3 without permeating the separation membrane 2 decreases.

In the present embodiment, until the cumulative operation time T1 of the recovery pump 32 reaches 20000 hr, the carbon dioxide separation performance of the separation membrane 2 does not change, and the pressure _Pm of the _first recovered gas flow path 22 is 10 kPa. , a constant flow rate of the first recovery gas is recovered.

After the cumulative operation time T1 of the recovery pump 32 reaches 20000 _hr , the longer the operation time becomes, the greater the influence of deterioration of the separation membrane ₂ becomes. By adjusting (controlling) the capacity of the decompression pump 31 to 0.0005T ₁ ) kPa, the carbon dioxide-containing gas flow rate permeating through the separation membrane 2 and the carbon dioxide concentration in the first recovered gas are kept constant. can be done. As a result, the flow rate of the carbon dioxide-containing gas supplied to the subsequent adsorber 3 without passing through the separation membrane 2 can be kept constant.

Here, the pressure _Pm of the _first recovery gas flow path 22 and the cumulative operation time T1 of the recovery pump 32 for keeping the carbon dioxide concentration constant are obtained by experiments in the present embodiment, and are quantitatively not definitive.

Next, a carbon dioxide-containing gas having a carbon dioxide content of 20% and a water vapor content of 5% is supplied from the carbon dioxide-containing gas supply source through the carbon dioxide-containing gas supply channel 21 to the carbon dioxide separator. 1 first space. At the same time, flag information and operation step information of the adsorbers 3a and 3b during the previous operation, and opening/closing information of the first flow switching valve 11, the second flow switching valve 12, and the on-off valves 13a and 13b are read and reflected. By (activating the recovery pump 32 as well), the state of the previous operation is restored (S106).

As a result, due to the partial pressure difference between the carbon dioxide in the first space and the second space partitioned by the separation membrane 2 in the carbon dioxide separator 1, the carbon dioxide-containing gas is supplied from the carbon dioxide-containing gas supply source through the carbon dioxide-containing gas supply channel 21. The carbon dioxide contained in the carbon dioxide-containing gas supplied to the first space of the carbon dioxide separator 1 selectively permeates the separation membrane 2, and in the second space, it consists of carbon dioxide that has permeated the separation membrane 2. A first recovery gas with a carbon dioxide concentration of 95% (dry condition) is produced.

Next, the controller 200 determines whether or not there is an adsorber 3 whose adsorption process flag is ON (S107). repeat.

As a result of the determination in S107, if there is no adsorber 3 whose adsorption process flag is ON, S107 is branched to the No side, and the adsorption process flag of the adsorber 3a is turned ON (S108).

Here, the flag is a determination value set by the controller 200 for the states of the respective adsorbers 3a and 3b.

Next, as shown in FIG. 3, the controller 200 closes the on-off valve 13a and switches the first channel switching valve 11 and the second channel switching valve 12 to the side of the adsorber 3a, thereby Then, the carbon dioxide-containing gas supply channel 21 and the exhaust gas channel 24 are communicated with each other to supply the carbon dioxide-containing gas to the adsorber 3a (S109).

As a result, carbon dioxide and water vapor contained in the carbon dioxide-containing gas supplied to the adsorber 3a are adsorbed by the adsorbent 4a in the adsorber 3a. Among the carbon dioxide-containing gas supplied to the adsorber 3a, the gas that is not adsorbed by the adsorbent 4a is exhausted to the outside through the exhaust gas passage 24 as carbon dioxide-reduced exhaust gas.

Next, the controller 200 determines whether the accumulated operation time T1 of the recovery pump 32 is 60000 hr or _more (S110).

Until the accumulated operation time T1 of the recovery pump 32 reaches 60000 hr, S110 is branched to the No _side , and the time _Ia for which the adsorption process flag is ON reaches 60 min set as the predetermined adsorption operation time. S111 is branched to the No side to continue the adsorption process of the adsorber 3a.

After the cumulative operation time T1 of the recovery pump 32 reaches 60000 hr, S110 is branched to the Yes _side , and the time _Ia during which the adsorption process flag is ON is set as the predetermined adsorption operation time (0. 001T ₁ ) min, S112 is branched to the No side to continue the adsorption process of the adsorber 3a.

FIG. 6 is _a characteristic diagram showing the relationship between the cumulative operation time T1 of the recovery pump 32 and the predetermined adsorption operation time in the carbon dioxide separation and capture device 400. As shown in FIG.

In S111 or S112, when the time _Ia during which the adsorption process flag is ON exceeds the predetermined adsorption operation time (the predetermined adsorption operation time has elapsed since the adsorption process of the adsorber 3a was started), S
111 or S112 branches to the Yes side, the controller 200 turns off the adsorption process flag of the adsorber 3a, and disconnects the first flow path switching valve 11 and the second flow path switching valve 12 from the adsorber 3a side (adsorption Switch the first flow path switching valve 11 and the second flow path switching valve 12 to the side of the adsorber 3b so that the carbon dioxide-containing gas supply flow path 21 and the exhaust gas flow path 24 communicate via the device 3b) ( S113).

Here, the predetermined adsorption operating time in the present embodiment is 60 minutes when the cumulative operating time T1 of the recovery pump 32 is _{less than} 60000 hr (until the cumulative operating time T1 of the recovery pump 32 reaches 60000 hr). In the case of 60,000 hrs or more (after reaching 60,000 hrs), it was set to (0.001T ₁ ) min, but this is only an example.

Here, the predetermined adsorption operation time is a time obtained by experiments in advance, and is a time determined from the amount of carbon dioxide that the adsorbent 4 can adsorb.

As shown in FIG. 5, when the cumulative operating time T1 of the recovery pump 32 is _less than 20000 hr (until it reaches 20000 hr), the pressure _Pm in the first recovery gas flow path 22 is 10 kPa, and the recovery pump 32 When the cumulative operating time T1 is 20000 hr or more (after reaching 20000 hr), the separation membrane ₂ is controlled so that the pressure Pm in the _first collected gas flow path 22 is ( _0.0005T1 ) kPa. , the flow rate of the carbon dioxide-containing gas supplied to the subsequent adsorber 3 can be kept within _a predetermined range. During the operation time of 60 minutes, the amount of carbon dioxide that can be adsorbed by the adsorbent 4 (carbon dioxide supply flow rate×supply time) is supplied.

On the _other hand, when the cumulative operating time T1 of the recovery pump 32 is 60000 hr or more (after reaching 60000 hr), the deterioration of the separation membrane 2 accelerates, and the amount of carbon dioxide supplied to the adsorbent 4 becomes When the time _Ia during which the flag is ON is 60 minutes, which is the predetermined adsorption operation time up to that point, the amount of carbon dioxide that can be adsorbed by the adsorbent 4 is less than the amount of carbon dioxide, and the gas inside the adsorber 3 is a gas other than carbon dioxide. concentration may be relatively high.

Therefore, as shown in FIG. 6, when the cumulative operation time T1 of the recovery pump 32 is 60000 hr or _more (after reaching 60000 hr), the predetermined adsorption operation time is set to ( _0.001T1 ) min. The amount of carbon dioxide supplied to the adsorbent 4 is ensured to be equal to or greater than the amount of carbon dioxide that the adsorbent 4 can adsorb.

As a result, the carbon dioxide concentration of the second recovery gas recovered in the subsequent regeneration steps (S114 to S118) can be kept constant. Here, the predetermined adsorption operation time was determined by experiment assuming that the second recovery gas with the required carbon dioxide concentration was obtained at the predetermined adsorption operation time (60 min or (0.001 T ₁ ) min), but this value is an example. However, it is not quantitatively deterministic.

Next, the controller 200 determines whether or not there is an adsorber 3 whose regeneration process flag is ON (S114). repeat.

As a result of the determination in S114, if there is no adsorber 3 whose regeneration process flag is ON, S114 is branched to the No side, and the regeneration process flag of the adsorber 3a is turned ON (S115).

Next, the controller 200 opens the on-off valve 13a (S116). As a result, the adsorber 3a is depressurized by the recovery pump 32 through the second recovery gas flow path 23, and carbon dioxide and water vapor adsorbed on the adsorbent 4a are desorbed by the time the on-off valve 13a is opened. Then, the second collected gas, which is the desorbed gas from the adsorber 3a (adsorbent 4a), is sucked into the collection pump 32 via the second collected gas flow path 23 .

Next, the controller 200 checks whether or not the time Id during which the regeneration process flag is ON exceeds a predetermined regeneration operation time (60 minutes) ( _S117 ).

In _S117 , if the time Id during which the regeneration process flag is ON does not exceed the predetermined regeneration operation time (60 min), S117 is branched to the No side until the predetermined regeneration operation time (60 min) is exceeded. The confirmation of S117 is repeated.

As a result of confirmation in _S117 , if the time Id during which the regeneration process flag is ON exceeds the predetermined regeneration operation time (60 min), S117 branches to the Yes side, and the controller 200 controls the adsorber 3a. is turned off, and the on-off valve 13a is closed (S118).

Here, although the predetermined regeneration operation time in the present embodiment is set to 60 minutes, this is merely an example. The predetermined regeneration time is a value obtained in advance by experiments, and is a value that can determine whether or not the desorption of the carbon dioxide adsorbed by the adsorbent 4 from the adsorbent 4 in the adsorption step immediately before the regeneration step has been completed. If it is

Therefore, it is not quantitatively definitive. That is, here, when the elapsed time from the time when the regeneration process flag is turned ON reaches 60 minutes, the carbon dioxide adsorbed by the adsorbent 4 in the adsorption process immediately before the regeneration process is desorbed from the adsorbent 4. It is determined that the regeneration process is completed, and before the elapsed time reaches 60 minutes from the time when the regeneration process flag is turned ON, the carbon dioxide adsorbed by the adsorbent 4 in the adsorption process immediately before the regeneration process is released from the adsorbent 4. Although it is determined that desorption is not complete, this criterion is only an example.

Next, the controller 200 confirms whether there is a request to stop the operation of the carbon dioxide capture device 400 (S119).

As a result of confirmation in S119, if there is no operation stop request, S119 is branched to the No side, the process proceeds to S107, and operation is continued until an operation stop request is received.

As a result of the confirmation in S119, if there is an operation stop request, S119 is branched to the Yes side, flag information and operation step information of the adsorbers 3a and 3b, the first flow switching valve 11 and the second flow switching valve 12 and the opening _/ closing valves 13a and 13b, and the accumulated operation time T1 of the recovery pump 32 are stored in the memory of the controller 200, and the operation of the carbon dioxide capture device 400 is stopped.

[1-3. effects, etc.]
As described above, in the present embodiment, the carbon dioxide separation and recovery device 400 includes the carbon dioxide-containing gas supply channel 21, the carbon dioxide separator 1, the pressure reducing pump 31, the first recovered gas channel 22, A plurality of adsorbers 3a and 3b, an exhaust gas flow path 24, a recovery pump 32, a second recovery gas flow path 23, a plurality of on-off valves 13a and 13b, and a controller 200 are provided.

The carbon dioxide-containing gas supply channel 21 is a channel configured to allow a carbon dioxide-containing gas containing at least carbon dioxide to flow. The carbon dioxide separator 1 includes a first space interposed in the middle of the carbon dioxide-containing gas supply channel 21 and a separation membrane configured to selectively permeate and separate carbon dioxide contained in the carbon dioxide-containing gas. 2 and a second space separated from the first space by the separation membrane 2 .

A decompression pump 31 reduces the pressure in the second space of the carbon dioxide separator 1 to produce a first recovery gas composed of carbon dioxide that has permeated the separation membrane 2 and moved from the first space of the carbon dioxide separator 1 to the second space. configured to retrieve.

The first recovered gas flow path 22 is a flow path that connects the second space of the carbon dioxide separator 1 and the decompression pump 31, and when the decompression pump 31 operates, the second space is decompressed, It is a channel that connects the second space of the carbon dioxide separator 1 and the suction port of the decompression pump 31 so that the first recovered gas flows into the first recovered gas channel 22 and is recovered by the decompression pump 31 .

The plurality of adsorbers 3a and 3b adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space of the carbon dioxide separator 1 to the carbon dioxide-containing gas supply channel 21 without passing through the separation membrane 2. The adsorbents 4 a and 4 b are filled so as to do so, and are connected to the carbon dioxide-containing gas supply channel 21 on the downstream side of the carbon dioxide separator 1 via the first channel switching valve 11 .

The exhaust gas flow path 24 is arranged between the plurality of adsorbers 3a and 3b so that among the carbon dioxide-containing gas supplied to the adsorbers 3a and 3b, the gas that is not adsorbed by the adsorbers 3a and 3b can be exhausted to the outside. It is connected to the downstream side via the second flow path switching valve 12 .

The recovery pump 32 is configured to depressurize the adsorbers 3a and 3b and recover a second recovery gas composed of carbon dioxide desorbed from the adsorbents 4a and 4b.

The second recovery gas flow path 23 is a flow path that connects the plurality of adsorbers 3a, 3b and the recovery pump 32, and when the recovery pump 32 operates to decompress the adsorbers 3a, 3b, the second Near the inflow port of the carbon dioxide-containing gas in the plurality of adsorbers 3 a and 3 b and the suction port of the recovery pump 32 so that the second recovered gas flows into the second recovered gas flow path 23 and is recovered by the recovery pump 32 are communicated.

The plurality of on-off valves 13a and 13b are valves for individually opening and closing a plurality of branched flow paths branched corresponding to the plurality of adsorbers 3a and 3b in the second collected gas flow path 23, and the corresponding adsorbers 3 is closed when a carbon dioxide-containing gas is supplied to the corresponding adsorber 3 and is open when carbon dioxide is desorbed from the adsorbent 4 by depressurization of the corresponding adsorber 3 .

The controller 200 is configured to control the decompression pump 31 and the recovery pump 32 so as to recover the first recovered gas from the carbon dioxide separator 1 and recover the second recovered gas from the adsorber 3 .

In addition, the controller 200 supplies the adsorbent 4 with carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space of the carbon dioxide separator 1 to the carbon dioxide-containing gas supply flow path 21 in at least one adsorber 3 . and causing the at least one remaining adsorber 3 to perform a regeneration step of desorbing carbon dioxide from the adsorbent 4 while at least one adsorber 3 is performing the adsorption step, Each adsorber 3 is configured to control the first channel switching valve 11, the second channel switching valve 12, and the on-off valves 13a and 13b so that the adsorption process and the regeneration process are alternately repeated.

In addition, the controller 200 counts the integrated value of the operating time of the recovery pump 32 (cumulative operating time T ₁ ), and the amount of gas supplied to the adsorber 3 during the adsorption process is determined according to the cumulative operating time T ₁ of the recovery pump 32 . The capacity of the decompression pump 31 is controlled so that the amount of carbon dioxide-containing gas supplied is within a predetermined range.

As a result, the carbon dioxide separator 1 is
Even if the separation membrane 2 is deteriorated, the amount of carbon dioxide-containing gas supplied to the adsorber 3 can be kept within a predetermined range, so the second recovered gas recovered in the regeneration process of the adsorber 3 can be reduced to carbon dioxide It can be operated without lowering the carbon concentration.

For example, even if the separation membrane ₂ has a characteristic that the amount of impurities permeating through the separation membrane ₂ increases as the cumulative operating time T1 of the recovery pump 32 increases, The amount of gas permeating through the separation membrane 2 is reduced so that the amount of carbon dioxide-containing gas supplied to the adsorber 3 during the adsorption step is within a predetermined range. Since the contained gas amount can be kept within a predetermined range, operation can be performed without lowering the carbon dioxide concentration of the second recovery gas recovered in the regeneration process of the adsorber 3 .

Therefore, it is possible to provide the carbon dioxide separation and recovery device 400 capable of stably recovering high-purity carbon dioxide over a long period of time.

In addition, as in the present embodiment, the carbon dioxide separation and recovery apparatus 400 has the characteristic that the longer the operation time of the recovery pump 32, the more impurities permeate through the separation membrane 2. In this case, the controller 200 controls the performance of the pressure reducing pump 31 when the cumulative operation time T1 of the recovery pump 32 exceeds _a predetermined value, compared to before the cumulative operation time T1 of the recovery pump 32 exceeds _a predetermined value. may be lowered.

In that case, even if the separation membrane 2 has a characteristic that the amount of impurities permeating through the separation membrane ₂ increases as the cumulative operating time T1 of the recovery pump 32 increases, the controller 200 controls the operation of the recovery pump 32. By reducing the capacity of the decompression pump 31 when the cumulative operating time T1 exceeds _a predetermined value to the capacity before the cumulative operating time T1 of the recovery pump 32 exceeds the predetermined value, the carbon dioxide supplied to the adsorber ₃ is reduced. Since the carbon-containing gas amount can be kept within a predetermined range, operation can be performed without lowering the carbon dioxide concentration of the second recovery gas recovered in the regeneration process of the adsorber 3 .

Therefore, it is possible to provide the carbon dioxide separation and recovery device 400 capable of stably recovering high-purity carbon dioxide over a long period of time.

Further, as in the present embodiment, the carbon dioxide separation and capture device 400 (after the cumulative operating time _T1 of the recovery pump 32 exceeds _a predetermined value) increases the cumulative operating time T1, the decompression pump 31 abilities may be reduced.

Even in that case, the amount of carbon dioxide-containing gas supplied to the adsorber 3 can be kept within a predetermined range, so operation can be performed without lowering the carbon dioxide concentration of the second recovery gas recovered in the regeneration process of the adsorber 3. .

Therefore, it is possible to provide the carbon dioxide separation and recovery device 400 capable of stably recovering high-purity carbon dioxide over a long period of time.

Further, as in the present embodiment, in the carbon dioxide separation and capture device 400, the controller 200 counts the integrated value of the operation time of the recovery pump 32 (accumulated operation time T ₁ ), and the accumulated operation time of the recovery pump 32 It may be configured to control the duration of the adsorption step so that the amount of carbon dioxide-containing gas supplied to the adsorber 3 during the adsorption step is within _a predetermined range according to T1.

Even in that case, even if the separation membrane 2 of the carbon dioxide separator 1 deteriorates due to the long-term operation of the carbon dioxide separation and recovery device 400, the amount of carbon dioxide-containing gas supplied to the adsorber 3 during the adsorption step is predetermined. , the operation can be performed without lowering the carbon dioxide concentration of the second recovery gas recovered in the regeneration process of the adsorber 3 .

For example, even if the separation membrane ₂ has a characteristic that the amount of impurities permeating through the separation membrane ₂ increases as the cumulative operating time T1 of the recovery pump 32 increases, The amount of carbon dioxide-containing gas supplied to the adsorber 3 during the adsorption step is increased so that the amount of carbon dioxide-containing gas supplied to the adsorber 3 during the adsorption step is within a predetermined range. Since the amount of carbon dioxide-containing gas to be supplied can be kept within a predetermined range, operation can be performed without lowering the carbon dioxide concentration of the second recovery gas recovered in the regeneration step of the adsorber 3 .

Therefore, it is possible to provide the carbon dioxide separation and recovery device 400 capable of stably recovering high-purity carbon dioxide over a long period of time.

In addition, as in the present embodiment, the carbon dioxide separation and recovery apparatus 400 has the characteristic that the longer the operation time of the recovery pump 32, the more impurities permeate through the separation membrane 2. In this case, the controller 200 sets the time for continuing the adsorption process when the cumulative operation time T1 of the recovery pump 32 exceeds _a predetermined value to before the cumulative operation time T1 of the recovery pump 32 exceeds _a predetermined value. can be longer.

In that case, even if the separation membrane 2 has a characteristic that the amount of impurities permeating through the separation membrane ₂ increases as the cumulative operating time T1 of the recovery pump 32 increases, the controller 200 controls the operation of the recovery pump 32. By making the time during which the adsorption step is continued when the cumulative operating time _T1 exceeds the predetermined value longer _than before the cumulative operating time T1 of the recovery pump 32 exceeds the predetermined value, the adsorber is allowed to continue during the adsorption step. Since the amount of carbon dioxide-containing gas supplied to 3 can be kept within a predetermined range, operation can be performed without lowering the carbon dioxide concentration of the second recovery gas recovered in the regeneration step of adsorber 3 .

Therefore, it is possible to provide the carbon dioxide separation and recovery device 400 capable of stably recovering high-purity carbon dioxide over a long period of time.

Further, as in the present embodiment, the carbon dioxide separation and capture apparatus 400 (after the cumulative operating time _T1 of the recovery pump 32 exceeds _a predetermined value) increases the adsorption step as the cumulative operating time T1 increases. You may lengthen the time to continue.

Even in that case, the amount of carbon dioxide-containing gas supplied to the adsorber 3 during the adsorption step can be kept within a predetermined range, so the carbon dioxide concentration of the second recovery gas recovered in the regeneration step of the adsorber 3 is reduced. You can drive without worrying.

Therefore, it is possible to provide the carbon dioxide separation and recovery device 400 capable of stably recovering high-purity carbon dioxide over a long period of time.

Further, as in the present embodiment, the carbon dioxide separation and capture device 400 increases the cumulative operating time T1 after the cumulative operating time T1 of the recovery pump 32 exceeds _{a first} predetermined value (for example, 20000 hr). Further, after the cumulative operating time T1 of the recovery pump 32 exceeds _{a second} predetermined value (eg, 60000 hr), the cumulative operating time T1 becomes longer. , the time for which the adsorption step is continued may be lengthened.

In that case, if the accumulated operation time T1 of the recovery pump 32 exceeds the _second predetermined value, even if the deterioration of the separation membrane 2 accelerates, the carbon dioxide supplied to the adsorber 3 during the adsorption step Since the contained gas amount can be kept within a predetermined range, operation can be performed without lowering the carbon dioxide concentration of the second recovery gas recovered in the regeneration process of the adsorber 3 .

Therefore, it is possible to provide the carbon dioxide separation and recovery device 400 capable of stably recovering high-purity carbon dioxide over a long period of time.

In the present embodiment, the carbon dioxide separation and recovery apparatus 400 controls the capacity of the decompression pump 31 and the duration of the adsorption process based on the cumulative operating time of the recovery pump 32. At least one of the capacity of the decompression pump 31 and the duration of the adsorption process may be controlled based on the cumulative operation time of .

(Other embodiments)
As described above, the embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments in which changes, replacements, impossibility, omissions, etc. are made. Further, it is also possible to combine the constituent elements described in the above embodiments to form a new embodiment.

Therefore, other embodiments will be exemplified below.

In the present embodiment, as an example of the separation membrane 2, a facilitated transport membrane containing monoethanolamine, which is a type of alkanolamine, has been described. The separation membrane 2 may selectively permeate carbon dioxide or selectively permeate an impurity gas coexisting with carbon dioxide in a carbon dioxide-containing gas.

Therefore, the separation membrane 2 is not limited to the amine compound monoethanolamine. For example, if the separation membrane 2 is a separation membrane made of other amine compounds, a separation membrane containing an ionic liquid, or a separation membrane containing an alkali carbonate, a high carbon dioxide permeation rate can be obtained.

It should be noted that the above-described embodiment is for illustrating the technology of the present disclosure, and various modifications, substitutions, additions, omissions, etc. can be made within the scope of the claims or equivalents thereof.

INDUSTRIAL APPLICABILITY The present disclosure is applicable to a carbon dioxide separator equipped with a carbon dioxide separation membrane and a carbon dioxide separation and recovery device combining a plurality of adsorbers. It is most suitable for carbon dioxide separation and recovery equipment for applications that require recovery. Specifically, the present disclosure is applicable to a hydrogen production device using hydrocarbon as fuel, a fuel cell power generation system, and the like.

1 carbon dioxide separator 2 separation membrane 3, 3a, 3b adsorber 4, 4a, 4b adsorbent 11 first channel switching valve 12 second channel switching valve 13, 13a, 13b on-off valve 21 carbon dioxide-containing gas supply channel 22 first recovered gas channel 23 second recovered gas channel 24 exhaust gas channel 31 decompression pump 32 recovery pump 33 pressure detector 200 controller 400 carbon dioxide separation and recovery device

Claims (5)

a carbon dioxide-containing gas supply channel configured to allow a carbon dioxide-containing gas containing at least carbon dioxide to flow;
A first space interposed in the middle of the carbon dioxide-containing gas supply channel, a separation membrane configured to selectively permeate and separate carbon dioxide contained in the carbon dioxide-containing gas, and the separation membrane a carbon dioxide separator having the first space and a partitioned second space;
a decompression pump configured to depressurize the second space and recover a first recovery gas composed of carbon dioxide that has permeated the separation membrane and moved from the first space to the second space;
A flow path connecting the second space and the decompression pump, wherein when the decompression pump is operated, the second space is decompressed, and the first recovery gas flows into the flow path to reduce the decompression. a first recovered gas flow path that communicates the second space with a suction port of the decompression pump so as to be recovered by the pump;
An adsorbent is filled so as to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply channel without permeating the separation membrane, and the carbon dioxide a plurality of adsorbers connected via a first channel switching valve to the carbon dioxide-containing gas supply channel on the downstream side of the separator;
Via a second flow switching valve on the downstream side of the plurality of adsorbers so that, among the carbon dioxide-containing gas supplied to the adsorber, the gas that is not adsorbed by the adsorber can be exhausted to the outside. a connected exhaust gas flow path;
a recovery pump configured to depressurize the adsorber and recover a second recovery gas composed of carbon dioxide desorbed from the adsorbent;
A flow path connecting the plurality of adsorbers and the recovery pump, wherein the second recovery gas flows into the flow path and the recovery pump is decompressed when the recovery pump operates to reduce the pressure in the adsorber. a second recovery gas flow path that communicates the vicinity of the inlet of the carbon dioxide-containing gas in the plurality of adsorbers with the suction port of the recovery pump so that the carbon dioxide-containing gas is recovered by the pump;
A valve that individually opens and closes a plurality of branched flow paths branched corresponding to the plurality of adsorbers in the second recovered gas flow path, wherein the carbon dioxide-containing gas is supplied to the corresponding adsorbers is in a closed state, and a plurality of on-off valves in an open state when the corresponding adsorber is decompressed and carbon dioxide is desorbed from the adsorbent;
controlling the vacuum pump and the recovery pump to recover the first recovered gas from the carbon dioxide separator and the second recovered gas from the adsorber; An adsorption step of causing the adsorbent to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply flow path is performed, and at least one of the adsorbers performs the adsorption step. during which time at least one remaining said adsorber undergoes a regeneration step to desorb carbon dioxide from said adsorbent, each said adsorber alternating between said adsorption step and said regeneration step. a controller configured to control the first flow switching valve, the second flow switching valve, and the on-off valve;
The controller counts the integrated value of the operation time of the recovery pump, and the amount of carbon dioxide-containing gas supplied to the adsorber during the adsorption step falls within a predetermined range according to the integrated value. A carbon dioxide capture device configured to control the capacity of the vacuum pump as described above. The separation membrane has a characteristic that the amount of impurities permeating through the separation membrane increases as the operation time of the recovery pump increases,
2. The carbon dioxide separation and capture apparatus according to claim 1, wherein said controller lowers the performance of said decompression pump when said integrated value exceeds a predetermined value compared to before said integrated value exceeds a predetermined value. a carbon dioxide-containing gas supply channel configured to allow a carbon dioxide-containing gas containing at least carbon dioxide to flow;
A first space interposed in the middle of the carbon dioxide-containing gas supply channel, a separation membrane configured to selectively permeate and separate carbon dioxide contained in the carbon dioxide-containing gas, and the separation membrane a carbon dioxide separator having the first space and a partitioned second space;
a decompression pump configured to depressurize the second space and recover a first recovery gas composed of carbon dioxide that has permeated the separation membrane and moved from the first space to the second space;
A flow path connecting the second space and the decompression pump, wherein when the decompression pump is operated, the second space is decompressed, and the first recovery gas flows into the flow path to reduce the decompression. a first recovered gas flow path that communicates the second space with a suction port of the decompression pump so as to be recovered by the pump;
An adsorbent is filled so as to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply channel without permeating the separation membrane, and the carbon dioxide a plurality of adsorbers connected via a first channel switching valve to the carbon dioxide-containing gas supply channel on the downstream side of the separator;
Via a second flow switching valve on the downstream side of the plurality of adsorbers so that, among the carbon dioxide-containing gas supplied to the adsorber, the gas that is not adsorbed by the adsorber can be exhausted to the outside. a connected exhaust gas flow path;
a recovery pump configured to depressurize the adsorber and recover a second recovery gas composed of carbon dioxide desorbed from the adsorbent;
A flow path connecting the plurality of adsorbers and the recovery pump, wherein the second recovery gas flows into the flow path and the recovery pump is decompressed when the recovery pump operates to reduce the pressure in the adsorber. a second recovery gas flow path that communicates the vicinity of the inlet of the carbon dioxide-containing gas in the plurality of adsorbers with the suction port of the recovery pump so that the carbon dioxide-containing gas is recovered by the pump;
A valve that individually opens and closes a plurality of branched flow paths branched corresponding to the plurality of adsorbers in the second recovered gas flow path, wherein the carbon dioxide-containing gas is supplied to the corresponding adsorbers is in a closed state, and a plurality of on-off valves in an open state when the corresponding adsorber is decompressed and carbon dioxide is desorbed from the adsorbent;
controlling the vacuum pump and the recovery pump to recover the first recovered gas from the carbon dioxide separator and the second recovered gas from the adsorber; An adsorption step of causing the adsorbent to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply flow path is performed, and at least one of the adsorbers performs the adsorption step. during which time at least one remaining said adsorber undergoes a regeneration step to desorb carbon dioxide from said adsorbent, each said adsorber alternating between said adsorption step and said regeneration step. a controller configured to control the first flow switching valve, the second flow switching valve, and the on-off valve;
The controller counts the integrated value of the operation time of the recovery pump, and the amount of carbon dioxide-containing gas supplied to the adsorber during the adsorption step falls within a predetermined range according to the integrated value. a carbon dioxide capture device configured to control the duration of the adsorption step. The separation membrane has a characteristic that the amount of impurities permeating through the separation membrane increases as the operation time of the recovery pump increases,
4. The carbon dioxide separation and capture apparatus according to claim 3, wherein said controller makes the time during which said adsorption step is continued when said integrated value exceeds a predetermined value longer than before said integrated value exceeds a predetermined value. a carbon dioxide-containing gas supply channel configured to allow a carbon dioxide-containing gas containing at least carbon dioxide to flow;
A first space interposed in the middle of the carbon dioxide-containing gas supply channel, a separation membrane configured to selectively permeate and separate carbon dioxide contained in the carbon dioxide-containing gas, and the separation membrane a carbon dioxide separator having the first space and a partitioned second space;
a decompression pump configured to depressurize the second space and recover a first recovery gas composed of carbon dioxide that has permeated the separation membrane and moved from the first space to the second space;
A flow path connecting the second space and the decompression pump, wherein when the decompression pump is operated, the second space is decompressed, and the first recovery gas flows into the flow path to reduce the decompression. a first recovered gas flow path that communicates the second space with a suction port of the decompression pump so as to be recovered by the pump;
An adsorbent is filled so as to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply channel without permeating the separation membrane, and the carbon dioxide a plurality of adsorbers connected via a first channel switching valve to the carbon dioxide-containing gas supply channel on the downstream side of the separator;
Via a second flow switching valve on the downstream side of the plurality of adsorbers so that, among the carbon dioxide-containing gas supplied to the adsorber, the gas that is not adsorbed by the adsorber can be exhausted to the outside. a connected exhaust gas flow path;
a recovery pump configured to depressurize the adsorber and recover a second recovery gas composed of carbon dioxide desorbed from the adsorbent;
A flow path connecting the plurality of adsorbers and the recovery pump, wherein the second recovery gas flows into the flow path and the recovery pump is decompressed when the recovery pump operates to reduce the pressure in the adsorber. a second recovery gas flow path that communicates the vicinity of the inlet of the carbon dioxide-containing gas in the plurality of adsorbers with the suction port of the recovery pump so that the carbon dioxide-containing gas is recovered by the pump;
A valve that individually opens and closes a plurality of branched flow paths branched corresponding to the plurality of adsorbers in the second recovered gas flow path, wherein the carbon dioxide-containing gas is supplied to the corresponding adsorbers is closed and is open when the corresponding adsorber is decompressed and carbon dioxide is desorbed from the adsorbent,
The vacuum pump and the recovery pump are operated to recover the first recovered gas from the carbon dioxide separator and the second recovered gas from the adsorber, and at least one adsorber is supplied with the An adsorption step of causing the adsorbent to adsorb carbon dioxide contained in the carbon dioxide-containing gas discharged from the first space to the carbon dioxide-containing gas supply flow path is performed, and at least one of the adsorbers performs the adsorption step. during which time at least one remaining said adsorber undergoes a regeneration step to desorb carbon dioxide from said adsorbent, each said adsorber alternating between said adsorption step and said regeneration step. 2. A method of operating a carbon dioxide separation and capture device, wherein the first flow switching valve, the second flow switching valve, and the on-off valve are operated,
The integrated value of the operation time of the recovery pump is counted, and the pressure reduction is performed so that the amount of carbon dioxide-containing gas supplied to the adsorber during the adsorption step is within a predetermined range according to the integrated value. A method of operating a carbon dioxide separation and capture apparatus in which at least one of the capacity of a pump and the duration of the adsorption step is changed.

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