A pressure swing adsorption control method and device, a terminal device and a storage medium

Abstract

The application discloses a pressure swing adsorption control method and device, a terminal equipment and a storage medium, which are used for controlling a pressure swing adsorption system, comprising a vacuum pump and a plurality of adsorption towers; each adsorption tower is provided with an air inlet valve, an air outlet valve and a communication valve used for controlling the communication relationship with the remaining adsorption towers; the method comprises the following steps: according to a received pressure swing adsorption instruction, determining first and second selected adsorption towers, controlling the air inlet valve and the air outlet valve of the first selected adsorption tower to be opened, making flue gas enter the first selected adsorption tower, judging the first carbon dioxide concentration of the air outlet valve, and then according to the first carbon dioxide concentration, closing the air inlet valve and the air outlet valve, and opening the communication valve between the first and second selected adsorption towers, so that the pressure in the first selected adsorption tower is reduced; by implementing the application, the operator does not need to manually control each valve in the pressure swing adsorption system, the operation difficulty is reduced, and accidents caused by operation errors are avoided.

Description

Technical Field

[0001] This invention relates to the field of carbon capture pressure swing adsorption (PSA) technology, and in particular to a PSA control method, apparatus, terminal equipment, and storage medium. Background Technology

[0002] Carbon capture, utilization, and storage (CCUS) is a technology with significant potential for large-scale greenhouse gas emission reduction. Developing CCUS is a crucial measure to effectively control greenhouse gas emissions given the current energy structure dominated by coal. It also helps achieve the low-carbon and intensive utilization of high-carbon resources such as coal and oil, promotes the transformation and upgrading of high-emission industries such as power generation, coal chemicals, and oil and gas, and drives the development of other related industries. This is of great significance for addressing climate change and promoting low-carbon development. The implementation of carbon capture technology helps reduce carbon dioxide emissions from coal-fired power plants, mitigating global climate change; it facilitates the exploration of the feasibility of carbon dioxide emission reduction from coal-fired power plants and carbon trading; and it helps establish a positive image of power plants as socially responsible entities.

[0003] Currently, there is limited research on pressure swing adsorption (PSA) for carbon capture technology. To control the adsorption of flue gas under different partial pressures during flue gas flow through the adsorption tower, operators need to manually control a large number of control valves on the adsorption tower. This requires a high level of technical skill from the operators, is very cumbersome to operate, makes training difficult, and is prone to causing accidents due to operational errors. Summary of the Invention

[0004] This invention provides a pressure swing adsorption control method, device, terminal equipment, and storage medium, which can reduce the workload of operators when there are a large number of adsorption towers, and at the same time avoid accidents caused by operational errors.

[0005] This invention provides a pressure swing adsorption (PSA) control method for controlling a PSA system, the PSA system comprising: a vacuum pump and several adsorption towers; each adsorption tower is provided with an inlet valve, an outlet valve, and a connecting valve for controlling the communication relationship with the other adsorption towers; each outlet valve is provided with a corresponding carbon dioxide concentration sensor.

[0006] The pressure swing adsorption control method includes:

[0007] Upon receiving a pressure swing adsorption (PSA) command, a first selected adsorption tower and a second selected adsorption tower are determined according to the adsorption command. The inlet valve, outlet valve, and connecting valve of the first selected adsorption tower are controlled to open, so that the raw material flue gas enters the first selected adsorption tower through the inlet valve. The first selected adsorption tower adsorbs carbon dioxide in the raw material flue gas and discharges the adsorbed flue gas through the outlet valve.

[0008] The system receives first carbon dioxide concentration data in the gas discharged from the outlet valve, wherein the first carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; when the first carbon dioxide concentration data reaches a first threshold, the system controls the inlet valve and outlet valve of the first selected adsorption tower to close, and controls the connecting valve to open, so that the first selected adsorption tower is connected to the second selected adsorption tower, and the pressure in the first selected adsorption tower is reduced.

[0009] After the preset time threshold is reached, the connecting valve is closed, and the vacuum pump is controlled to evacuate the first selected adsorption tower to remove the carbon dioxide adsorbed by the first selected adsorption tower.

[0010] Furthermore, after controlling the vacuum pump to evacuate the first selected adsorption tower, the method further includes:

[0011] Acquire second carbon dioxide concentration data of the gas extracted by the vacuum pump; wherein, the second carbon dioxide concentration data is collected by the carbon dioxide concentration sensor;

[0012] Based on the second carbon dioxide concentration data, when the second carbon dioxide concentration data reaches the second threshold, the vacuum pump is controlled to stop vacuuming the first selected adsorption tower.

[0013] Furthermore, after controlling the vacuum pump to stop evacuating the first selected adsorption tower, the method further includes:

[0014] Open the connecting valve to connect the first selected adsorption tower and the second selected adsorption tower, and increase the pressure in the first selected adsorption tower.

[0015] After the preset time threshold is reached, the exhaust valve of the first selected adsorption tower is opened to balance the pressure of the first and second selected adsorption towers with the external pressure.

[0016] Furthermore, the controlled pressure swing adsorption system also includes: a corresponding pressure sensor installed in each adsorption tower;

[0017] The step of closing the connecting valve and controlling the vacuum pump to evacuate the first selected adsorption tower after reaching a preset time threshold includes:

[0018] After a preset time threshold is reached, the first pressure data of the first selected adsorption tower and the second selected adsorption tower after they are connected are obtained; wherein, the first pressure data is obtained according to the pressure sensor;

[0019] Based on the first pressure data, determine whether the first pressure data is stable; if the first pressure data is determined to be stable, close the connecting valve and control the vacuum pump to perform vacuum evacuation on the first selected adsorption tower.

[0020] Furthermore, after the preset time threshold is reached, the exhaust valve of the first selected adsorption tower is opened to balance the pressure of the first selected adsorption tower and the second selected adsorption tower with the external pressure.

[0021] After a preset time threshold is reached, second pressure data of the first and second selected adsorption towers after they are connected are obtained; wherein, the second pressure data is obtained according to the pressure sensor;

[0022] Based on the second pressure data, determine whether the second pressure data is stable; when the first pressure data is determined to be stable, control the exhaust valve of the first selected adsorption tower to open.

[0023] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments;

[0024] This invention provides a pressure swing adsorption control device, comprising: a flue gas adsorption module, a pressure reduction adsorption module, and a vacuum pumping module;

[0025] The flue gas adsorption module is used to determine a first selected adsorption tower and a second selected adsorption tower according to the adsorption command when receiving a pressure swing adsorption command, and control the inlet valve, outlet valve and connecting valve of the first selected adsorption tower to open, so that the raw flue gas enters the first selected adsorption tower through the inlet valve, the first selected adsorption tower adsorbs the carbon dioxide in the raw flue gas, and the adsorbed flue gas is discharged through the outlet valve.

[0026] The pressure-reducing adsorption module is used to receive the first carbon dioxide concentration data in the gas discharged from the outlet valve, wherein the first carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; when the first carbon dioxide concentration data reaches a first threshold, the module controls the inlet valve and outlet valve of the first selected adsorption tower to close, and controls the connecting valve to open, so that the first selected adsorption tower is connected to the second selected adsorption tower, and the pressure in the first selected adsorption tower is reduced.

[0027] The vacuum pumping module is used to close the connecting valve and control the vacuum pump to perform vacuum pumping on the first selected adsorption tower after a preset time threshold is reached, so as to remove the carbon dioxide adsorbed by the first selected adsorption tower.

[0028] Furthermore, the pressure swing adsorption control device also includes: a pumping stop module;

[0029] The vacuum pumping stop module is used to acquire second carbon dioxide concentration data of the gas extracted by the vacuum pump after controlling the vacuum pump to perform vacuum pumping on the first selected adsorption tower; wherein the second carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; based on the second carbon dioxide concentration data, when the second carbon dioxide concentration data reaches a second threshold, the module controls the vacuum pump to stop performing vacuum pumping on the first selected adsorption tower.

[0030] Furthermore, the pressure swing adsorption control device also includes: a pressure balancing module;

[0031] The pressure balancing module is used to open the connecting valve after controlling the vacuum pump to stop evacuating the first selected adsorption tower, so as to connect the first selected adsorption tower and the second selected adsorption tower and increase the pressure in the first selected adsorption tower; after reaching the preset time threshold, it controls the exhaust valve of the first selected adsorption tower to open, so as to balance the pressure of the first selected adsorption tower and the second selected adsorption tower with the external pressure.

[0032] Based on the above method embodiments, the present invention provides a corresponding terminal device embodiment;

[0033] The present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the pressure swing adsorption control method according to any one of the present invention.

[0034] Based on the above method embodiments, the present invention provides a corresponding storage medium embodiment;

[0035] The present invention provides a storage medium comprising a stored computer program, wherein, when the computer program is executed, it controls the device containing the storage medium to perform the pressure swing adsorption control method according to any one of the present invention.

[0036] The embodiments of the present invention have the following beneficial effects:

[0037] This invention discloses a pressure swing adsorption (PSA) control method, apparatus, terminal equipment, and storage medium for controlling a PSA system. The PSA system includes a vacuum pump and several adsorption towers. Each adsorption tower is equipped with an inlet valve, an outlet valve, and a connecting valve for controlling its connection with the other adsorption towers. Each outlet valve is equipped with a corresponding carbon dioxide concentration sensor. The PSA control method involves: upon receiving a PSA command and determining a first and second selected adsorption tower based on the command, first controlling the inlet valve, outlet valve, and connecting valve of the first selected adsorption tower to open and close, allowing the raw flue gas to enter the first selected adsorption tower through the inlet valve, undergo adsorption in the first selected adsorption tower, and then exit through the outlet valve; subsequently, it can determine whether the carbon dioxide concentration in the gas discharged from the outlet valve reaches a certain level. When the first threshold is reached, the inlet and outlet valves of the first selected adsorption tower are closed to prevent excessive carbon dioxide leakage. Simultaneously, the connecting valve is opened to connect the first and second selected adsorption towers, reducing the pressure in the first selected adsorption tower. This allows both towers to continue absorbing carbon dioxide from the flue gas at a lower pressure. Then, a preset time threshold is waited for the pressure between the first and second selected adsorption towers to reach equilibrium. At this point, absorption has been completed, and the connecting valve is closed, while a vacuum pump evacuates the first selected adsorption tower, causing the adsorbed carbon dioxide to desorb from the adsorbent surface, allowing the adsorbent in the first selected adsorption tower to begin the next absorption cycle. By implementing this invention, the inlet valve, outlet valve, connecting valve, and vacuum pump do not require manual control during pressure swing adsorption. When there are many adsorption towers, operators only need to ensure the normal operation of the pressure swing adsorption system, reducing the workload and preventing accidents caused by operational errors. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a pressure swing adsorption control method according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of a pressure swing adsorption system provided in an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of various adsorption towers and their control valves provided in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the sequential control logic flow of each adsorption tower provided in an embodiment of the present invention;

[0042] Figure 5This is a schematic diagram of a pressure swing adsorption control device provided in an embodiment of the present invention. Detailed Implementation

[0043] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0044] like Figure 1 As shown in the figure, an embodiment provides a pressure swing adsorption control method for controlling a pressure swing adsorption system. The pressure swing adsorption system includes: a vacuum pump and several adsorption towers; each adsorption tower is provided with an inlet valve, an outlet valve, and a connecting valve for controlling the communication relationship with the other adsorption towers; each outlet valve is provided with a corresponding carbon dioxide concentration sensor.

[0045] The pressure swing adsorption control method includes:

[0046] Step S101: Upon receiving a pressure swing adsorption command, determine a first selected adsorption tower and a second selected adsorption tower according to the adsorption command, and control the inlet valve, outlet valve and connecting valve of the first selected adsorption tower to open, so that the raw material flue gas enters the first selected adsorption tower through the inlet valve, the first selected adsorption tower adsorbs carbon dioxide in the raw material flue gas, and the adsorbed flue gas is discharged through the outlet valve.

[0047] Step S102: Receive first carbon dioxide concentration data in the gas discharged from the outlet valve, wherein the first carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; when the first carbon dioxide concentration data reaches a first threshold, control the inlet valve and outlet valve of the first selected adsorption tower to close, and control the connecting valve to open, so that the first selected adsorption tower is connected to the second selected adsorption tower, and the pressure in the first selected adsorption tower is reduced;

[0048] Step S103: After reaching the preset time threshold, close the connecting valve and control the vacuum pump to evacuate the first selected adsorption tower to remove the carbon dioxide adsorbed by the first selected adsorption tower.

[0049] For step S101, in a preferred embodiment, it is first necessary to receive a pressure swing adsorption command, and then determine the corresponding first selected adsorption tower and second selected adsorption tower according to the pressure swing adsorption command. Then, control the inlet valve, outlet valve and connecting valve of the first selected adsorption tower to open and close. In this way, the raw material flue gas can enter the first selected adsorption tower through the inlet valve, and the first selected adsorption tower adsorbs the carbon dioxide in the raw material flue gas. The adsorbed flue gas is discharged through the outlet valve.

[0050] It should be noted that, according to the adsorption command, not only can the first and second selected adsorption towers be determined, but also a greater number of adsorption towers can be determined. The amount of data for determining adsorption towers can be set according to actual needs. The adsorbent in the adsorption tower can also be set according to actual needs. Therefore, in addition to adsorbing carbon dioxide, the adsorbent in the adsorption tower can also adsorb other substances in the raw material flue gas. This invention does not make specific limitations.

[0051] In a preferred embodiment, for step S102, firstly, a first carbon dioxide concentration data in the gas is collected by a carbon dioxide concentration sensor. Then, based on the first carbon dioxide concentration data, the first carbon dioxide concentration data is compared with a preset first threshold. When the first carbon dioxide concentration data is greater than or equal to the first threshold, the inlet valve of the first selected adsorption tower is closed to stop the gas from being introduced into the first selected adsorption tower. The outlet valve of the first selected adsorption tower is closed to prevent the flue gas in the first selected adsorption tower from flowing out. The connecting valve is opened to connect the first selected adsorption tower with the second selected adsorption tower. At this time, as the first selected adsorption tower and the second selected adsorption tower are connected, the pressure in the first selected adsorption tower will decrease to achieve the purpose of pressure swing adsorption.

[0052] The first threshold includes, but is not limited to, 2%; the first threshold can also be set according to actual needs, and the present invention does not impose specific limitations.

[0053] For step S103, in a preferred embodiment, the controlled pressure swing adsorption system further includes: each adsorption tower is equipped with a corresponding pressure sensor;

[0054] The step of closing the connecting valve and controlling the vacuum pump to evacuate the first selected adsorption tower after reaching a preset time threshold includes:

[0055] After a preset time threshold is reached, the first pressure data of the first selected adsorption tower and the second selected adsorption tower after they are connected are obtained; wherein, the first pressure data is obtained according to the pressure sensor;

[0056] Based on the first pressure data, determine whether the first pressure data is stable; if the first pressure data is determined to be stable, close the connecting valve and control the vacuum pump to perform vacuum evacuation on the first selected adsorption tower.

[0057] Specifically, after reaching a preset time threshold, the pressure between the first selected adsorption tower and the second selected adsorption tower tends to stabilize. The pressure sensor acquires the first pressure data of the first selected adsorption tower and the second selected adsorption tower after they are connected, and then determines whether the first pressure data has reached a stable level. When it is determined that the first pressure data has reached a stable level, the connecting valve is closed to block the connection between the first selected adsorption tower and the second selected adsorption tower. Then, the vacuum pump is controlled to evacuate the first selected adsorption tower to remove the carbon dioxide adsorbed by the first selected adsorption tower. The preset time threshold can be set according to actual needs, and the present invention does not impose specific limitations.

[0058] In a preferred embodiment, after controlling the vacuum pump to evacuate the first selected adsorption tower, the method further includes:

[0059] Acquire second carbon dioxide concentration data of the gas extracted by the vacuum pump; wherein, the second carbon dioxide concentration data is collected by the carbon dioxide concentration sensor;

[0060] Based on the second carbon dioxide concentration data, when the second carbon dioxide concentration data reaches the second threshold, the vacuum pump is controlled to stop vacuuming the first selected adsorption tower.

[0061] Specifically, the pressure swing adsorption system further includes a corresponding carbon dioxide concentration sensor installed at the gas outlet of the vacuum pump;

[0062] During the process of the vacuum pump extracting gas from the first selected adsorption tower, a second carbon dioxide concentration data of the gas extracted by the vacuum pump is collected by a carbon dioxide concentration sensor set at the outlet of the vacuum pump. The second carbon dioxide concentration data is compared with a preset second threshold. When it is determined that the second carbon dioxide concentration data reaches the second threshold, the vacuum pump is controlled to stop vacuuming the first selected adsorption tower.

[0063] The second threshold includes, but is not limited to, 40%; the second threshold can be set according to actual needs, and the present invention does not impose specific limitations.

[0064] In a preferred embodiment, after controlling the vacuum pump to stop evacuating the first selected adsorption tower, the method further includes:

[0065] Open the connecting valve to connect the first selected adsorption tower and the second selected adsorption tower, and increase the pressure in the first selected adsorption tower.

[0066] After the preset time threshold is reached, the exhaust valve of the first selected adsorption tower is opened to balance the pressure of the first and second selected adsorption towers with the external pressure.

[0067] Specifically, after controlling the vacuum pump to stop evacuating the first selected adsorption tower, the connecting valve is then opened to connect the first and second selected adsorption towers. Since the second selected adsorption tower has a certain pressure, the pressure in the first selected adsorption tower will increase after the first and second selected adsorption towers are connected, entering the first stage of pressurization. Then, after waiting for the preset time threshold to be reached, that is, after the pressure between the first and second selected adsorption towers reaches a stable level, the exhaust valve of the first selected adsorption tower is opened to balance the pressure of the first and second selected adsorption towers with the external pressure. At this time, the first and second selected adsorption towers can carry out the next round of adsorption.

[0068] In a preferred embodiment, after the preset time threshold is reached, the exhaust valve of the first selected adsorption tower is opened to balance the pressure of the first selected adsorption tower and the second selected adsorption tower with the external pressure.

[0069] After a preset time threshold is reached, second pressure data of the first and second selected adsorption towers after they are connected are obtained; wherein, the second pressure data is obtained according to the pressure sensor;

[0070] Based on the second pressure data, determine whether the second pressure data is stable; when the first pressure data is determined to be stable, control the exhaust valve of the first selected adsorption tower to open.

[0071] Specifically, after reaching the preset time threshold, in order to ensure that the pressure between the first selected adsorption tower and the second selected adsorption tower is balanced, it is necessary to obtain the second pressure data of the first selected adsorption tower and the second selected adsorption tower after they are connected by a pressure sensor. Then, by judging whether the pressure sensor data is stable, when it is determined that the first pressure data is stable, the exhaust valve of the first selected adsorption tower is controlled to open.

[0072] The method for determining whether the pressure sensor data is stable can be any existing data stability determination method, and this invention does not impose any specific limitations.

[0073] In an optional embodiment, when it is determined by the pressure swing adsorption command that there are more than two selected adsorption towers, after connecting the first selected adsorption tower and the second selected adsorption tower, it is necessary to connect the remaining selected adsorption towers to the first selected adsorption tower and the second selected adsorption tower before performing the subsequent steps.

[0074] Schematic, during the depressurization stage of the adsorption tower, when only the first selected adsorption tower and the second selected adsorption tower are connected, the pressure in the first selected adsorption tower reaches the first stage of depressurization. When the first selected adsorption tower, the second selected adsorption tower, and the third selected adsorption tower are connected, the pressure in the first selected adsorption tower reaches the second stage of depressurization, and so on. The same principle applies to the pressurization stage of the adsorption tower.

[0075] In an optional embodiment, such as Figure 2 As shown, the controlled pressure swing adsorption system also includes: a flue gas fan, a cooler, a Roots blower, a steam-water separator, a buffer device, and a cooler device.

[0076] The flue gas blower is connected to the cooler, the cooler is connected to the Roots blower, the Roots blower is connected to the steam-water separator, the steam-water separator is connected to each of the adsorption towers, each of the adsorption towers is connected to the vacuum pump (vacuum pumping equipment), the vacuum pump is connected to the buffer equipment, and the buffer equipment is connected to the cooler equipment.

[0077] The raw flue gas first enters the flue gas induced draft fan, and then passes through a cooler to cool its temperature. After cooling and steam-water separation, the cooled flue gas is pressurized by a Roots blower and sent to a steam-water separator to remove free water. It then enters a pressure swing adsorption (PSA) tower. In the PSA section, easily adsorbed water and carbon dioxide in the flue gas are selectively adsorbed by the adsorbent, while unadsorbed nitrogen, oxygen, etc., are vented at the top of the adsorption tower. After adsorption, the carbon dioxide adsorbed in the adsorbent bed is extracted by a vacuum pump, cooled, and then sent to a crude carbon dioxide buffer tank for further processing.

[0078] In an optional embodiment, the present invention also relates to a sequential control logic for the entry of raw material flue gas into a pressure swing adsorption tower, such as... Figure 3 and Figure 4 As shown, where, Figure 4 The exhaust valve in the text is referred to as the air outlet valve, and the pressure boosting valve is referred to as the connecting valve.

[0079] The sequential control logic for the raw material flue gas entering the pressure swing adsorption tower includes:

[0080] 1) Determine whether the relevant programmable valves, vacuum pumps, coolers, and instruments of the pressure swing adsorption unit are in normal condition;

[0081] 2) Determine whether the raw material flue gas is led to the primary cooler and the secondary cooler by the induced draft fan equipment, and adjust the cooler water valve to ensure that the temperature entering the pressure swing adsorption unit is within the allowable operating range.

[0082] 3) Determine whether the increased air pressure of the raw flue gas after entering the flue gas booster fan meets the adsorption working pressure of the pressure swing adsorption device.

[0083] 4) After steam-water separation, the raw material flue gas enters the #1 adsorption tower through the inlet programmable valve (V-1-5) and undergoes adsorption bed reaction from bottom to top. The exhaust venting programmable valve (V-1-1) at the outlet of the #1 adsorption tower is opened to release the unadsorbed gas. It is determined whether the carbon dioxide gas concentration at the outlet of the #1 adsorption tower reaches 2%. If so, the raw material flue gas inlet valve (V-1-5) and exhaust venting valve (V-1-1) are closed. Otherwise, the process waits for the carbon dioxide gas concentration to reach the activation condition.

[0084] 5) Open the pressure reducing connecting valves (V-1-3) and (V-3-3) of adsorption tower #1 and adsorption tower #3 to determine whether the outlet pressures of adsorption tower #1 and adsorption tower #3 are consistent and have reached a balanced state. If so, the pressure of adsorption tower #1 is reduced to the first-level pressure reduction through the connecting valves; otherwise, continue to reduce the pressure at the outlet of the adsorption tower.

[0085] 6) Open the pressure reducing connecting valves (V-1-4) and (V-4-4) of adsorption tower #1 and adsorption tower #4 to determine whether the outlet pressures of adsorption tower #1 and adsorption tower #4 are consistent and have reached a balanced state. If so, the pressure of adsorption tower #1 is reduced to the secondary pressure reducing valve after connecting the valves. Otherwise, continue to reduce the pressure at the outlet of the adsorption tower.

[0086] 7) Open the pressure reducing connecting valves (V-1-5) and (V-5-5) of adsorption tower #1 and adsorption tower #5 to determine whether the outlet pressures of adsorption tower #1 and adsorption tower #5 are consistent and have reached a balanced state. If so, the pressure of adsorption tower #1 is reduced to the third-stage pressure reduction through the connecting valves; otherwise, continue to reduce the pressure at the outlet of the adsorption tower.

[0087] 8) Determine that the three-stage pressure reduction adsorption towers #1, #3, #4, and #5 have all reached equilibrium. If so, close all connecting control valves and open the outlet control valve (V-1-6) of adsorption tower #1. Use a vacuum pump to extract the adsorption tower to the cooler and into the buffer tank.

[0088] 9) Determine if the carbon dioxide concentration at the vacuum pump outlet has reached approximately 40%. If so, stop the vacuum pump and the #1 adsorption tower will enter the regeneration state. Otherwise, continue to monitor the carbon dioxide concentration at the pump outlet.

[0089] 10) Open the pressure boosting connecting valves (V-1-3) and (V-3-3) of adsorption tower #1 and adsorption tower #3 to determine whether the outlet pressures of adsorption tower #1 and adsorption tower #3 are consistent and have reached a balanced state. If so, the pressure of adsorption tower #1 is boosted to the first-level pressure boosting through the connecting valves; otherwise, continue to increase the pressure at the outlet of the adsorption tower.

[0090] 11) Open the pressure boosting connecting valves (V-1-4) and (V-4-4) of adsorption tower #1 and adsorption tower #4 to determine whether the outlet pressures of adsorption tower #1 and adsorption tower #4 are consistent and have reached a balanced state. If so, the pressure of adsorption tower #1 is boosted to the secondary pressure boosting level through the connecting valves; otherwise, continue to boost the pressure at the outlet of the adsorption tower.

[0091] 12) Open the pressure boosting connecting valves (V-1-5) and (V-5-5) of adsorption tower #1 and adsorption tower #5, and determine whether the outlet pressures of adsorption tower #1 and adsorption tower #5 are consistent and have reached a balanced state. If so, the pressure of adsorption tower #1 is boosted to the third-stage pressure boosting through the connecting valves; otherwise, continue to boost the pressure at the outlet of the adsorption tower.

[0092] 13) Open the exhaust vent control valve (V-1-1) of adsorption tower #1 to allow the raw gas to flow through the adsorption tower and its outlet pipe section. Determine whether the outlet pressure of adsorption tower #1 has reached the adsorption pressure. If so, the final pressurization is completed, and the next adsorption cycle can begin.

[0093] 14) Other adsorption towers are operated in the same manner, but their adsorption and desorption processes are staggered to achieve adsorption cycle.

[0094] 15) The above is the overall pressure swing adsorption process of adsorption tower #1. The operation steps of the other five towers are exactly the same as those of adsorption tower #1, except that the timing is staggered according to a certain procedure. For example, when adsorption tower #1 and adsorption tower #3 are working in combination, adsorption tower #2 and adsorption tower #4, which are in the idle stage, can be started at the same time.

[0095] The core process of the aforementioned pressure swing adsorption (PSA) lies in the state transition of the adsorption tower. From the adsorption state, carbon dioxide and water are absorbed, while oxygen and nitrogen are emitted. Once the adsorption tower reaches concentration equilibrium after depressurization, it enters the regeneration state. In the regeneration state, the pressure is increased to release carbon dioxide gas, followed by vacuuming. Once the adsorption tower reaches pressure equilibrium, it can re-enter the adsorption state for the next cycle.

[0096] This invention streamlines the complex control process of a pressure swing adsorption (PSA) system and designs a rational sequential control procedure, enabling cyclical sequential control of adsorption and desorption processes across multiple adsorption towers. The sequential control operation can stagger the operating states of each adsorption tower, avoiding the impact of human error or misoperation on the safety and stability of the device. Furthermore, by utilizing automated sequential control logic, different adsorption towers can complete the adsorption process at different pressure swing stages, significantly shortening the adsorption time and improving the concentration efficiency of the device. Given the importance of PSA devices in carbon capture, utilization, and storage, this invention provides valuable reference and demonstration for subsequent projects.

[0097] By implementing the above embodiments of the present invention, the following effects are achieved:

[0098] This system enables sequential control of the adsorption and desorption processes across multiple absorption towers, allowing for staggered operation of each tower. This avoids the impact of human error, such as operator mistakes during complex procedures, on the safety and stability of the pressure swing adsorption system. Furthermore, the automated sequential control logic allows different absorption towers to complete the adsorption process at different pressure swing stages, significantly shortening the adsorption time and improving the concentration efficiency of the pressure swing adsorption system.

[0099] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments.

[0100] like Figure 5 As shown, an embodiment of the present invention provides a pressure swing adsorption control device, including: a flue gas adsorption module, a pressure reduction adsorption module, and a vacuum pumping module;

[0101] The flue gas adsorption module is used to determine a first selected adsorption tower and a second selected adsorption tower according to the adsorption command when receiving a pressure swing adsorption command, and control the inlet valve, outlet valve and connecting valve of the first selected adsorption tower to open, so that the raw flue gas enters the first selected adsorption tower through the inlet valve, the first selected adsorption tower adsorbs the carbon dioxide in the raw flue gas, and the adsorbed flue gas is discharged through the outlet valve.

[0102] The pressure-reducing adsorption module is used to receive the first carbon dioxide concentration data in the gas discharged from the outlet valve, wherein the first carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; when the first carbon dioxide concentration data reaches a first threshold, the module controls the inlet valve and outlet valve of the first selected adsorption tower to close, and controls the connecting valve to open, so that the first selected adsorption tower is connected to the second selected adsorption tower, and the pressure in the first selected adsorption tower is reduced.

[0103] The vacuum pumping module is used to close the connecting valve and control the vacuum pump to perform vacuum pumping on the first selected adsorption tower after a preset time threshold is reached, so as to remove the carbon dioxide adsorbed by the first selected adsorption tower.

[0104] In a preferred embodiment, the pressure swing adsorption control device further includes: a pumping stop module;

[0105] The vacuum pumping stop module is used to acquire second carbon dioxide concentration data of the gas extracted by the vacuum pump after controlling the vacuum pump to perform vacuum pumping on the first selected adsorption tower; wherein the second carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; based on the second carbon dioxide concentration data, when the second carbon dioxide concentration data reaches a second threshold, the module controls the vacuum pump to stop performing vacuum pumping on the first selected adsorption tower.

[0106] In a preferred embodiment, the pressure swing adsorption control device further includes: a pressure balancing module;

[0107] The pressure balancing module is used to open the connecting valve after controlling the vacuum pump to stop evacuating the first selected adsorption tower, so as to connect the first selected adsorption tower and the second selected adsorption tower and increase the pressure in the first selected adsorption tower; after reaching the preset time threshold, it controls the exhaust valve of the first selected adsorption tower to open, so as to balance the pressure of the first selected adsorption tower and the second selected adsorption tower with the external pressure.

[0108] It should be noted that the device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0109] Those skilled in the art will clearly understand that, for convenience and simplicity, the specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0110] Based on the above method embodiments, the present invention provides corresponding terminal device embodiments.

[0111] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor; when the processor executes the computer program, it implements the pressure swing adsorption control method of any embodiment of the present invention.

[0112] For example, in this embodiment, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the device.

[0113] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The device may include, but is not limited to, a processor and memory.

[0114] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the device, connecting various parts of the device via various interfaces and lines.

[0115] The memory can be used to store the computer programs and / or modules. The processor implements various functions of the device by running or executing the computer programs and / or modules stored in the memory and by calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc. In addition, the memory may include high-speed random access memory and non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0116] Based on the above method embodiments, the present invention provides corresponding storage medium embodiments.

[0117] Another embodiment of the present invention provides a storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the storage medium is located to execute the pressure swing adsorption control method of any embodiment of the present invention.

[0118] In this embodiment, the storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0119] The above description represents the preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A pressure swing adsorption control method, characterized in that, For controlling a pressure swing adsorption system, the pressure swing adsorption system includes: a vacuum pump and several adsorption towers; each adsorption tower is equipped with an inlet valve, an outlet valve and a connecting valve for controlling the communication relationship with the other adsorption towers; each outlet valve is equipped with a corresponding carbon dioxide concentration sensor. The pressure swing adsorption control method includes: Upon receiving a pressure swing adsorption (PSA) command, a first selected adsorption tower and a second selected adsorption tower are determined according to the PSA command. The inlet valve, outlet valve, and connecting valve of the first selected adsorption tower are controlled to open, so that the raw flue gas enters the first selected adsorption tower through the inlet valve. The first selected adsorption tower adsorbs the carbon dioxide in the raw flue gas and discharges the adsorbed flue gas through the outlet valve. The system receives first carbon dioxide concentration data in the gas discharged from the outlet valve, wherein the first carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; when the first carbon dioxide concentration data reaches a first threshold, the system controls the inlet valve and outlet valve of the first selected adsorption tower to close, and controls the connecting valve to open, so that the first selected adsorption tower is connected to the second selected adsorption tower, and the pressure in the first selected adsorption tower is reduced. After the preset time threshold is reached, the connecting valve is closed and the vacuum pump is controlled to vacuum the first selected adsorption tower so as to remove the carbon dioxide adsorbed by the first selected adsorption tower. After controlling the vacuum pump to evacuate the first selected adsorption tower, the second carbon dioxide concentration data of the gas extracted by the vacuum pump is obtained; wherein, the second carbon dioxide concentration data is collected by the carbon dioxide concentration sensor. Based on the second carbon dioxide concentration data, when the second carbon dioxide concentration data reaches the second threshold, the vacuum pump is controlled to stop vacuuming the first selected adsorption tower. After the vacuum pump stops evacuating the first selected adsorption tower, the connecting valve is opened to connect the first selected adsorption tower and the second selected adsorption tower, and the pressure in the first selected adsorption tower is increased. After the preset time threshold is reached, the exhaust valve of the first selected adsorption tower is opened to balance the pressure of the first and second selected adsorption towers with the external pressure.

2. The pressure swing adsorption control method as described in claim 1, characterized in that, The controlled pressure swing adsorption system also includes: a corresponding pressure sensor installed in each adsorption tower; The step of closing the connecting valve and controlling the vacuum pump to evacuate the first selected adsorption tower after reaching a preset time threshold includes: After a preset time threshold is reached, the first pressure data of the first selected adsorption tower and the second selected adsorption tower after they are connected are obtained; wherein, the first pressure data is obtained according to the pressure sensor; Based on the first pressure data, determine whether the first pressure data is stable; if the first pressure data is determined to be stable, close the connecting valve and control the vacuum pump to perform vacuum evacuation on the first selected adsorption tower.

3. The pressure swing adsorption control method as described in claim 2, characterized in that, The step of controlling the exhaust valve of the first selected adsorption tower to open after the preset time threshold is reached, so as to balance the pressure of the first selected adsorption tower and the second selected adsorption tower with the external pressure, includes: After a preset time threshold is reached, second pressure data of the first and second selected adsorption towers after they are connected are obtained; wherein, the second pressure data is obtained according to the pressure sensor; Based on the second pressure data, determine whether the second pressure data is stable; when the second pressure data is determined to be stable, control the exhaust valve of the first selected adsorption tower to open.

4. A pressure swing adsorption control device, characterized in that, The pressure swing adsorption control device uses the pressure swing adsorption control method according to claim 1; the pressure swing adsorption control device includes: a flue gas adsorption module, a pressure reduction adsorption module, a vacuum pumping module, a pumping stop module, and a pressure balance module. The flue gas adsorption module is used to determine a first selected adsorption tower and a second selected adsorption tower according to the pressure swing adsorption command when receiving the command, and to control the inlet valve, outlet valve and connecting valve of the first selected adsorption tower to open, so that the raw flue gas enters the first selected adsorption tower through the inlet valve, the first selected adsorption tower adsorbs the carbon dioxide in the raw flue gas, and the adsorbed flue gas is discharged through the outlet valve. The pressure-reducing adsorption module is used to receive the first carbon dioxide concentration data in the gas discharged from the outlet valve, wherein the first carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; when the first carbon dioxide concentration data reaches a first threshold, the module controls the inlet valve and outlet valve of the first selected adsorption tower to close, and controls the connecting valve to open, so that the first selected adsorption tower is connected to the second selected adsorption tower, and the pressure in the first selected adsorption tower is reduced. The vacuum pumping module is used to close the connecting valve and control the vacuum pump to perform vacuum pumping on the first selected adsorption tower after a preset time threshold is reached, so as to remove the carbon dioxide adsorbed by the first selected adsorption tower. The vacuum pumping stop module is used to acquire second carbon dioxide concentration data of the gas extracted by the vacuum pump after controlling the vacuum pump to perform vacuum pumping on the first selected adsorption tower; wherein, the second carbon dioxide concentration data is collected by the carbon dioxide concentration sensor; based on the second carbon dioxide concentration data, when the second carbon dioxide concentration data reaches a second threshold, the module controls the vacuum pump to stop performing vacuum pumping on the first selected adsorption tower. The pressure balancing module is used to open the connecting valve after controlling the vacuum pump to stop evacuating the first selected adsorption tower, so as to connect the first selected adsorption tower and the second selected adsorption tower and increase the pressure in the first selected adsorption tower; after reaching the preset time threshold, it controls the exhaust valve of the first selected adsorption tower to open, so as to balance the pressure of the first selected adsorption tower and the second selected adsorption tower with the external pressure.

5. A terminal device, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the pressure swing adsorption control method as described in any one of claims 1 to 3.

6. A storage medium, characterized in that, The storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device containing the storage medium to perform the pressure swing adsorption control method as described in any one of claims 1 to 3.

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