Control method, device, system and storage medium of pressure swing adsorption system

Abstract

In the disclosed embodiments, a control method, device, system and storage medium for a pressure swing adsorption system are provided, and the method includes: determining process timing patterns that match the normal operation numbers of multiple adsorption containers respectively; removing abnormal adsorption containers in response to the occurrence of the containers; multiple adsorption containers operate according to the matched current process timing pattern; when removing an abnormal adsorption container each time, reordering to form a target container arrangement sequence; matching the target process timing pattern based on the number of the remaining normal adsorption containers, and associating it with the target container arrangement sequence; determining the target step time to which each of the remaining normal adsorption containers switches from the current step time and executing the process step switching. In the disclosed embodiments, when removing the abnormal adsorption container, the remaining normal adsorption containers can work according to the process timing pattern of the number after removal, and the process step switching with constant pressure or small pressure change during the timing change is safe and undisturbed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of gas processing equipment, and in particular to a control method, device, system and storage medium for a pressure swing adsorption system. Background Art

[0002] Pressure swing adsorption technology, such as pressure swing adsorption (PSA) and pressurized vacuum desorption (VPSA), is based on the principle of utilizing the selective adsorption characteristics of the adsorbent for different adsorbates and the fact that the adsorption capacity varies with the pressure. Under the conditions of selective adsorption of the adsorbent, the impurity components in the raw gas are removed by high pressure adsorption, and these impurities are desorbed at low pressure to regenerate the adsorbent, thereby achieving separation of gas mixtures and regeneration of the adsorbent.

[0003] The pressure swing adsorption process itself is a highly automated sequential control process, which is basically time-controlled and automatically implemented by the DCS / PLC program. However, when some abnormal conditions occur in the device, such as failure of the control valve (such as the programmable valve or the solenoid valve that drives the programmable valve), a lot of operator intervention and control is required to ensure the normal and stable operation of the device.

[0004] However, when performing fault intervention, the adsorption tower with abnormal conditions needs to be stopped, which will also cause the corresponding process to stop, affecting production efficiency. However, if the stopped adsorption tower is to be replaced by another adsorption tower, it is necessary to consider whether the pressure change is safe, which makes planning difficult. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present disclosure is to provide a control method, device, system and storage medium for a pressure swing adsorption system to solve the problems in the related art.

[0006] According to a first aspect of the present disclosure, there is provided a control method for a pressure swing adsorption system, the pressure swing adsorption system comprising a plurality of adsorption containers; the control method comprising: determining process timing patterns respectively matching a plurality of normal operating numbers of the plurality of adsorption containers; wherein each process timing pattern corresponds to a process step sequence comprising a plurality of process steps, and each process timing pattern comprises: the normal operating adsorption containers arranged in a container arrangement sequence each cyclically execute process steps according to the process step sequence at each step; and each adsorption container has an interval number of steps between adjacent process steps at the same step, so as to form a preset number of adsorption containers in an adsorption step at each step; wherein, as the normal operating number of the plurality of adsorption containers decreases, a reduction in process steps occurs between the process step sequences of the corresponding process timing pattern, and the reduced number of process steps and the interval number of steps between adjacent process steps are based on the number of adsorption containers in the adsorption step at each step. The method comprises the following steps: determining the number of adsorption containers that meet the abnormal condition in the plurality of adsorption containers that are operated according to the current process timing mode, determining the adsorption container as an abnormal adsorption container for removal; operating the plurality of adsorption containers according to the matched current process timing mode; when removing each abnormal adsorption container, reordering the remaining normally operating adsorption containers to take over the vacant positions of the abnormal adsorption containers in the current container arrangement sequence to form a target container arrangement sequence; matching the target process timing mode based on the number of the remaining normally operating adsorption containers, and associating the target container arrangement sequence with the target container arrangement sequence; determining the target process step at the target step in the target process timing mode to which the current process step at the current step in the current process timing mode is switched for each of the remaining normally operating adsorption containers, and performing the switch from the current process step to the target process step; and the interval number of steps between the current process step and the corresponding target process step is within the safe step number range.

[0007] In an embodiment of the first aspect, the abnormal condition includes: a valve state error of a control valve of the adsorption container and / or a pressure exceeding a preset range.

[0008] In an embodiment of the first aspect, the reduced process steps include: at least one process step with relatively the lowest pressure among the process steps; and a pair of pressure increasing and pressure decreasing steps with relatively the lowest pressure.

[0009] In an embodiment of the first aspect, each of the process timing modes has the same preset number; and / or the reduced number of process steps and the number of interval steps are determined based on the preset number.

[0010] In an embodiment of the first aspect, the determination of the target process step in the target process timing mode to which the current process step in the current process timing mode switches each of the remaining normally operating adsorption containers from the current process step in the current process timing mode comprises: determining the target step in the target process timing mode for each of the normally operating adsorption containers in the target container arrangement sequence based on the position of the abnormal adsorption container in the current container arrangement sequence and the current step; wherein the number of interval steps between the process step at the target step and the process step at the current step for each of the normally operating adsorption containers is within a safe step number range; and switching each of the normally operating adsorption containers to the process step corresponding to the target step.

[0011] In an embodiment of the first aspect, the control method of the pressure swing adsorption system further includes: restoring the adsorption container that has resumed normal operation to a pre-cut-off container arrangement sequence before being cut off, and applying a pre-cut-off process timing mode before being cut off.

[0012] In an embodiment of the first aspect, the adsorption container that has resumed normal operation is restored to the container arrangement sequence before being cut off, and the process timing mode before being cut off is applied, including: based on the position of the adsorption container to be restored in the container arrangement sequence before being cut off, determining the step to be cut out in the process timing mode after cutting off and the step to be cut in in the process timing mode before cutting off; wherein, in the step to be cut in, the adsorption container to be restored is in one of the several process steps with the lowest pressure in the process step sequence before cutting off, and the number of interval steps between other adsorption containers and the process steps in the step to be cut out is within the range of the safe number of steps.

[0013] A second aspect of the present disclosure provides a computer device, comprising: a processor and a memory; the memory stores program instructions; the processor is used to run the program instructions to execute the control method of the pressure swing adsorption system as described in any one of the first aspects.

[0014] A third aspect of the present disclosure provides a computer-readable storage medium storing program instructions, wherein the program instructions are executed to execute the control method for a pressure swing adsorption system as described in any one of the first aspects.

[0015] A fourth aspect of the present disclosure provides a computer program product, comprising: a computer program product for executing the control method of the pressure swing adsorption system as described in any one of the first aspects.

[0016] As described above, the control method, device, system and storage medium of the pressure swing adsorption system are provided in the embodiment of the present disclosure, and the method includes: determining process timing patterns that match the multiple normal operating numbers of the multiple adsorption containers respectively; in response to the appearance of an abnormal adsorption container that meets the abnormal conditions among the multiple adsorption containers currently in operation, cutting off the abnormal adsorption container; the multiple adsorption containers operate according to the matched current process timing pattern; when each abnormal adsorption container is cut off, re-arrange to form a target container arrangement sequence; match the target process timing pattern based on the number of the remaining normal adsorption containers, and associate it with the target container arrangement sequence; determine the target step time to which each of the remaining normal adsorption containers is switched from the current step time and execute process step switching. The embodiment of the present disclosure can achieve that when the abnormal adsorption container is cut off, the remaining normal adsorption containers can work according to the process timing pattern of the number after cutting off, and the process step switching with constant pressure or small pressure change during the timing change can be achieved to achieve safe and non-disruptive fault removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a pressure swing adsorption system in one embodiment of the present disclosure is shown.

[0018] Figure 2 A schematic flow chart showing a method for controlling a pressure swing adsorption system in an embodiment of the present disclosure.

[0019] Figure 3a A schematic diagram showing a process timing mode of 12 adsorption vessels operating normally in one embodiment of the present disclosure.

[0020] Figure 3b A schematic diagram showing the process timing modes of 11 adsorption vessels operating normally in one embodiment of the present disclosure.

[0021] Figure 3c A schematic diagram showing the process timing modes of 10 adsorption containers operating normally in one embodiment of the present disclosure.

[0022] Figure 3d A schematic diagram showing the process timing modes of nine adsorption vessels operating normally in one embodiment of the present disclosure.

[0023] Figure 3e A schematic diagram showing a process timing pattern of eight adsorption vessels operating normally in one embodiment of the present disclosure.

[0024] Figure 3f A schematic diagram showing the process timing modes of seven adsorption vessels operating normally in one embodiment of the present disclosure.

[0025] Figure 4a Shown in Figure 3aWhen any adsorption container is removed, the current step switches to Figure 3b Schematic diagram of the corresponding target step time.

[0026] Figure 4b A schematic diagram showing the process step comparison of the current step (1~15) and the target step (22~12) when "12-11 cut 1" is shown.

[0027] Figure 5 A schematic diagram showing the corresponding switching-out step and switching-in step when restoring A from 11 adsorption containers to 12 adsorption containers in one embodiment of the present disclosure.

[0028] Figure 6 A module schematic diagram showing a control device for a pressure swing adsorption system in an embodiment of the present disclosure.

[0029] Figure 7 A schematic diagram showing the structure of a computer device in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0030] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0031] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0032] In the pressure swing adsorption technology, the process steps of each pressure swing adsorption vessel (also called adsorption tower) need to be time-controlled, and the time-control is realized automatically by computer programs. However, when some abnormal conditions occur in the device, such as control valve failure, the operator still needs to intervene in the control to ensure the normal and stable operation of the device.

[0033] However, when performing fault intervention, the adsorption tower with abnormal conditions needs to be stopped, which will also cause the corresponding process to stop, affecting production efficiency. However, if the stopped adsorption tower is to be replaced by another adsorption tower, it is necessary to consider whether the pressure change is safe, which makes planning difficult.

[0034] In view of this, a control method for a pressure swing adsorption system is provided in an embodiment of the present disclosure, so that when an abnormal adsorption container is cut off, the adsorption containers in normal operation after the cut off can be switched to a process timing mode corresponding to the process timing mode of the normal operation number to operate, and the number of process steps of the adsorption containers before and after the switching changes little, so the air pressure changes little, thereby achieving the purpose of safe and disturbance-free switching.

[0035] First, possible application scenarios of the embodiments of the present disclosure are introduced. Figure 1 As shown, a schematic diagram of the structure of a pressure swing adsorption system in one embodiment of the present disclosure is shown.

[0036] exist Figure 1 In one embodiment of the present disclosure, a pressure swing adsorption system is shown to include 12 adsorption vessels A-L, each of which has a control valve for controlling its connection with different pipelines, such as A1-A9 to L1-L9.

[0037] The operating state of each pressure swing adsorption container A~L changes in sequence according to each process step in the process step sequence, which is roughly a cycle of adsorption→pressure drop→forward release→reverse release→(isolation)→flushing→pressure rise→adsorption. Exemplarily, the process step sequence may include: adsorption (expressed by A)→one pressure drop (expressed by E1D)→two pressure drops (expressed by E2D)→three pressure drops (expressed by E3D)→four pressure drops (expressed by E4D)→five pressure drops (expressed by E5D)→six pressure drops (expressed by E6D)→forward release (expressed by PP)→reverse release (expressed by BD)→isolation (expressed by IS)→flushing (expressed by P)→six pressure rise (expressed by E6R)→five pressure rise (expressed by E5R)→four pressure rise (expressed by E4R)→three pressure rise (expressed by E3R)→two pressure rise (expressed by E2R)→one pressure rise (expressed by E1R)→final rise (expressed by FR)→adsorption (expressed by A).

[0038] Thus, high-pressure adsorption and low-pressure desorption of the adsorbent are achieved, and the adsorbent can be regenerated by flushing. For example, some of the steps can be performed multiple times continuously or at intervals, such as multiple forward placements, multiple reverse placements, multiple flushings, etc. From A to BD is a process of reducing pressure. In BD, the pressure basically drops to the lowest level in each process step, and then the pressure is increased to A from the equalization step.

[0039] like Figure 2 As shown, a schematic diagram of a flow chart of a control method for a pressure swing adsorption system in one embodiment of the present disclosure is shown.

[0040] exist Figure 2 In the control method, the control method comprises:

[0041] Step S201: determining process timing modes respectively matching various normal operating quantities of the plurality of adsorption containers.

[0042] In some embodiments, the normal operating quantity can be obtained by gradually reducing the quantity of the plurality of adsorption containers. Figure 1 There are 12 adsorption containers in the system. As the abnormal adsorption containers are reduced one by one, the number of normal operation adsorption containers changes to 11, 10, 9, 8, 7, etc., and each normal operation number has a matching process timing mode.

[0043] Each process timing mode corresponds to a process step sequence including a plurality of process steps. Each process timing mode includes process steps that are cyclically performed at each step by adsorption containers that are normally operated and are arranged in a container arrangement sequence according to the process step sequence. In addition, each adsorption container has an interval number of steps between adjacent process steps at the same step, so that a preset number of adsorption containers in the adsorption step exist at each step.

[0044] For reference Figure 3a , which is a schematic diagram showing a process timing pattern of 12 normally operating adsorption containers in one embodiment of the present disclosure.

[0045] exist Figure 3a As can be seen in the figure, the 12 adsorption containers are A to L. To distinguish each adsorption container, the adsorption containers A to L are initially sorted, with A corresponding to 1, B corresponding to 2, and L corresponding to 12, forming a column-oriented container arrangement sequence of 1 to 12.

[0046] The process step sequence in the corresponding process timing mode includes: “A→A→E1D→E2D→E3D→E4D→E5D→E6D→PP→PP→BD→BD→IS→P→P→E6R→E5R→E4R→E3R→E2R→E1R→FR” 22 process steps executed in a cycle.

[0047] The process timing mode includes 24 steps, and the 22 process steps are executed at the 1st step to the 22nd step respectively, wherein the 23rd step and the 24th step are cyclically executed two process steps.

[0048] exist Figure 3a In , each column is a step sequence corresponding to the step sequence along the container arrangement sequence. To satisfy Figure 3a In each step, there are two adsorption containers in the adsorption step A, and then the process steps other than A in the step sequence are staggered by 2 steps. The staggering may include staggering by the number of steps forward and backward along the process step sequence.

[0049] For example, the first column of the step sequence is:

[0050] In "AA-E1R-E3R-E5R-P-IS-BD-PP-E5D-E3D-E1D", E1R after the second A is shifted forward 2 steps in the current 22-step process sequence relative to A, and each subsequent process step is shifted backward 2 steps relative to the previous step. Thus, 2 A's can be maintained in each step. Therefore, it can be understood that the number of interval steps can be determined by the number of adsorption containers that need to be in A in each step.

[0051] Step S202: In response to an adsorption container that meets an abnormal condition appearing in the plurality of adsorption containers operating according to the current process timing mode, the adsorption container is determined to be an abnormal adsorption container for removal.

[0052] When an adsorption container is abnormal, the abnormal adsorption container will be removed from the current container arrangement sequence, and the removal includes stopping the operation of the adsorption container. In some embodiments, the removal method is, for example, to set an ID (such as 0 or other specific IDs other than 1-12) for the ID of the abnormal adsorption container in the container arrangement sequence 1-12 so that it can be skipped.

[0053] In some embodiments, the abnormal condition may include: a valve state error of a control valve of the adsorption container and / or a pressure exceeding a preset range. As an example, the valve state error may include a state of whether it should be closed or opened. As an example, when a control valve fails, the valve pressure may increase to exceed a preset range, so the abnormal valve pressure may reflect a valve failure.

[0054] In some embodiments, the cutting may be performed manually or automatically. Figure 1 The pattern can be displayed in the human-computer interaction interface, and an operation unit for "cutting off" the adsorption container, such as a virtual button, can be displayed on each adsorption container. The user can operate the "cut off" operation unit to form a cutting instruction to allow the pressure swing adsorption system to cut off the corresponding adsorption container. For another example, an abnormal adsorption container can be identified based on the satisfaction of the abnormal condition, and the pressure swing adsorption system can automatically cut off the identified abnormal adsorption container.

[0055] Between the process timing modes corresponding to different normal operating numbers of the adsorption containers, as the normal operating numbers of the plurality of adsorption containers decrease, the process steps between the process step sequences of the corresponding process timing modes decrease.

[0056] For example, if Figure 3b , which is a schematic diagram showing the process timing mode of 11 adsorption containers operating normally in one embodiment of the present disclosure.

[0057] Compared to Figure 3a , Figure 3b The process timing pattern in corresponds to the process timing pattern after cutting off an adsorption container. It can be understood that Figure 3b The process step sequence corresponding to the process timing mode in the middle process includes: "A→A→E1D→E2D→E3D→E4D→E5D→E6D→PP→PP→BD→P→P→E6R→E5R→E4R→E3R→E2R→E1R→FR", a total of 20 process steps. Figure 3a The process step sequence in the embodiment reduces two steps, BD and IS, so that 11 adsorption containers can still be maintained and two adsorption containers can be kept in state A in each step.

[0058] It should be noted that the reduced process steps may include at least one process step with the lowest pressure among the process steps. Specifically, BD, IS, PP, P, etc. are the ones with the lowest pressure compared to other process steps, so one or more of these process steps may be selected for reduction.

[0059] It is understandable that each of the process timing modes has the same preset number, that is, even if the number of adsorption containers is reduced, the same number of adsorption containers in the adsorption step is still maintained in each step to meet the requirement of unchanged process state. For example, Figure 3a and Figure 3b In each step, there are two adsorption containers in state A. In order to achieve this requirement, the number of process steps to be reduced also depends on the preset number. Specifically, if two adsorption containers in state A are to be maintained in each step, then when one adsorption container is reduced, two process steps need to be reduced. Figure 3b The two steps of BD and IS are reduced.

[0060] Therefore, the preset number and the number of steps between adjacent adsorption containers in the same step are determined by the number of adsorption containers that need to be in the adsorption step in each step. Exemplarily, the three numbers may be the same.

[0061] Step S203: when each abnormal adsorption container is removed, the remaining normally operating adsorption containers are reordered to fill the vacant positions of the abnormal adsorption containers in the current container arrangement sequence to form a target container arrangement sequence.

[0062] For example, when Figure 3a The B adsorption container in the image is abnormal and is removed. The remaining adsorption containers A, C~L are sorted to form a new target container arrangement sequence, so that the following can be applied: Figure 3b The process timing mode information of 1 to 11 is shown. Specifically, A, C to L are sorted, and A, C to L are sorted into the target container arrangement sequence 1 to 11.

[0063] Step S204: matching the target process timing pattern based on the number of the remaining adsorption containers operating normally, and associating with the target container arrangement sequence.

[0064] For example, when B is cut off, the target container sorting sequence 1~11 obtained by sorting the remaining normal A, C~L is the same as Figure 3b 1~11 in the process timing mode of A are respectively associated. Figure 3b The process steps in the row “1” are executed by C. Figure 3b The process steps in row “2”.

[0065] Corresponds to Figure 3a and Figure 3b If abnormal target vessel resection occurs again, please refer to Figure 3c , a schematic diagram showing the process timing pattern of 10 normally operating adsorption containers in one embodiment of the present disclosure.

[0066] In this embodiment, the process step sequence reduces two process steps compared to the previous process timing mode. As an example, the two steps can be a pair of pressure increase and pressure decrease steps with relatively lowest pressure. For example, E6D and E6R are reduced in this embodiment. Of course, some process steps with lower pressure can also be adjusted by way of example, such as Figure 3c , relative to Figure 3b In terms of Figure 3b One of the two PPs in the embodiment is selected, and IS is added after P. Therefore, the process step sequence in this embodiment can be obtained, including: "A→A→E1D→E2D→E3D→E4D→E5D→PP→PP→BD→P→P→E5R→E4R→E3R→E2R→E1R→FR".

[0067] Figure 3d A schematic diagram showing the process timing modes of nine adsorption vessels operating normally in one embodiment of the present disclosure.

[0068] Compared to Figure 3c The process timing mode in can reduce IS and PP or BD.

[0069] Figure 3e A schematic diagram showing a process timing pattern of eight adsorption vessels operating normally in one embodiment of the present disclosure.

[0070] Compared to Figure 3d The process timing mode in can reduce E5R and E5D.

[0071] Figure 3f A schematic diagram showing the process timing modes of seven adsorption vessels operating normally in one embodiment of the present disclosure.

[0072] Compared to Figure 3e The process timing mode in can reduce E5R and E5D.

[0073] It is understandable that in Figure 3a to Figure 3b In the case where the 12 adsorption containers are reduced to 11 adsorption containers, if B is removed, since the interval between C and B in each step is the smallest, that is, the pressure difference is the smallest, C~L ( Figure 3a 3~12) in are filled upward to form the target container sorting sequence, corresponding to Figure 3b 2~11 in the.

[0074] In some embodiments, A~L can be defined as an array [1, 2, ..., 12]. When a certain adsorption container is abnormal, a mark is set, and the remaining adsorption containers are reordered, and a target container sorting sequence is obtained by a loop processing method.

[0075] It should be noted that, in some embodiments, it is not necessary to determine the process timing mode corresponding to the normal operating number of each adsorption container. For example, when the normal operating number is reduced below a preset threshold, it can no longer continue to work to meet the process requirements. For example, if there are 12 adsorption containers, it is only necessary to design a process timing mode for each number from 12 to 7, and no design is required for 0 to 6.

[0076] Step S205: Determine the target process step in the target process timing mode to which the current process step in the current process timing mode switches for each of the remaining adsorption containers that are operating normally, and execute the switching from the current process step to the target process step; the interval number of steps between the current process step and the corresponding target process step is within the safe step number range.

[0077] Specifically, when each adsorption container switches from the current process step to the target process step, it is necessary to consider whether the pressure difference between the current process step and the target process step is too large. If the pressure difference is too large, it may cause insecurity. In some embodiments, the target process step can be selected to have a step number between the current process step and the target process step that satisfies the safety pressure difference, such as 0, 1 step, or 2 steps. For example, FR is 1 step different from A, E1D is 2 steps different from A, etc. In some embodiments, when the position of the adsorption container to be cut off is different in the current container arrangement sequence, and the current step time is different, the target step time to be switched to is also different. When switching, the step time of the target process step that is as close as possible to the current process step in the safety pressure interval step range as possible will be selected as the target step time.

[0078] To this end, in some embodiments, step S205 may further include:

[0079] Step S251: Based on the position of the abnormal adsorption container in the current container arrangement sequence and the current step time, determine the target step time of each of the adsorption containers in the target container arrangement sequence that is operating normally in the target process timing mode. The number of interval steps between the process steps at the target step time and the process steps at the current step time of each of the adsorption containers that is operating normally is within the safe step number range.

[0080] As an example, Figure 4a As shown, shown in Figure 3a When any adsorption container is removed, the current step switches to Figure 3b Schematic diagram of the corresponding target step time.

[0081] Specifically, the first column in the table below is when 12 adsorption containers are cut to 11 adsorption containers, and the one cut is any one of A~L (expressed as "12-11 cut 1" ~ "12-11 cut 12"), and each current step time corresponds to the target step time of the switch. For example, the step time 1 of "12-11 cut 1" is used as the current step time, corresponding to the process steps in the column "AA...E1D" above, Figure 4a Recorded in the table Figure 3b When step 22 is used as the target step, the others such as 2 switch to 1, 3 switch to 2, .... 24 switch to 21.

[0082] You can refer to it together Figure 4b , showing a schematic diagram of process step comparison when the current step (1~15) switches to the target step (22~12) during the "12-11 cut 1" process.

[0083] Figure 4b In the figure, each current step and the corresponding target step are displayed in pairs. For example, at the current step 1, the step sequence of B~L is "A-E1R-E3R-E5R-P-IS-BD-PP-E5D-E3D-E1D", and the corresponding target step 22 is "A-FR-E2R-E4R-E6R-P-PP-E6D-E4D-E2D". By comparison, it can be seen that the process steps when B~L are switched will not be separated by more than 2 steps. Similarly, you can refer to Figure 4b The comparison between the step sequence of current step 2 and target step 1, current step 15 and target step 12 shows that the intervals are close. Therefore, the gas pressure safety of process step switching can be effectively guaranteed.

[0084] Step S252: switching each of the normally operating adsorption containers to the process step corresponding to the target step.

[0085] By determining in step S251 the target step that keeps the step sequence within the safe air pressure interval number of steps from the current step and executing the switch, the air pressure safety of the adsorption container when switching the process steps is effectively guaranteed.

[0086] In some embodiments, the control method of the pressure swing adsorption system may further include restoring the adsorption container that has resumed normal operation to the pre-cut container arrangement sequence before being cut off, and applying the pre-cut process timing mode before being cut off. Figure 3a In the process sequence mode, the abnormal adsorption container B is cut out from the adsorption containers A~L, so as to apply Figure 3b The process timing mode is then restored after the abnormality of B is eliminated. Figure 3a As an example, the recovery may be a manual recovery, such as Figure 1 The “restore” operation portion on each adsorption container, for example, is a virtual button, which can be operated to restore the corresponding adsorption container.

[0087] It should be noted that when restoring the removed adsorption container, it is necessary to consider that the air pressure change cannot be too large. In addition, in order to reduce the impact on other adsorption containers, the recovery can be a fixed-point recovery, that is, recovery is performed at a fixed time. Exemplarily, the step to be cut out in the process timing mode after resection and the step to be cut in the process timing mode before resection can be determined based on the position of the adsorption container to be restored in the container arrangement sequence before resection. Among them, in order to reduce the impact on the process after recovery, the process step in which the adsorption container is located after recovery can be one of the several process steps with the lowest air pressure, such as BD. In addition, the number of interval steps between other adsorption containers and the process steps in the step to be cut out is within the range of the safe number of steps.

[0088] like Figure 5 As shown, a schematic diagram showing the corresponding to-be-cut-out step and to-be-cut-in step when A is restored from 11 adsorption containers to 12 adsorption containers in one embodiment of the present disclosure.

[0089] As shown in the figure, when you want to restore the A (i.e. 1) adsorption container, you need to Figure 3b The process timing mode is restored to Figure 3a In the process timing mode, A will choose to recover in the BD state, that is, Figure 3a The step time when the adsorption container A is BD is taken as the step time to be cut in. Then, Figure 3a Find the step time 11 or 12 in the table as the step time to be entered. Figure 3b When finding the step to be cut out, the pressure change of each adsorption container in the recovery process is minimized. Figure 3a In step 11, the step sequence is "PP-E5D....IS", that is, to find Figure 3bWhen the x steps from 1 to 11 (i.e. B to L) are switched to Figure 3a At step 11, the pressure change is the smallest. Therefore, we can find Figure 3b Step 9 in the step sequence is the same as Figure 3a The process steps 2 to 12 in step 11 are basically the same, so we get "When the 11 adsorption containers are restored to A to the 12 adsorption containers, the switch is made from the waiting-to-cut-out step 9 to the waiting-to-cut-in step 11". Similarly, if the waiting-to-cut-in step is Figure 3a The middle step is 12, so the time to cut out is Figure 3b 10 in the middle step.

[0090] By analogy, "when 11 adsorption containers are restored to A to 12 adsorption containers, switch from step 9 to be cut out to step 11 to be cut in" is simply expressed as "Replicate 1, '9 cut 11", then we can get "Replicate 2, '11 cut 13", "Replicate 3, '13 cut 15", "Replicate 4, '15 cut 17", "Replicate 5, '17 cut 19", "Replicate 6, '19 cut 21", "Replicate 7, '21 cut 23", "Replicate 8, '1 cut 1", "Replicate 9, '3 cut 3", "Replicate 10, '5 cut 5", "Replicate 11, '7 cut 7", "Replicate 12, '9 cut 9", so as to keep the process steps of other adsorption containers other than the restored adsorption container as unchanged as possible or the number of changed steps as small as possible before and after the switching, so as to achieve the purpose of non-disturbance recovery.

[0091] In the embodiment of the present disclosure, the corresponding matching timing is adopted according to a reduction in the adsorption container, and the step of selecting the pressure difference safety range is switched. Figure 4b , when each adsorption container at each step is removed, the process timing mode and the appropriate step time can be switched instantly, and there is no need to wait after an abnormality occurs. In contrast, if multiple abnormal adsorption containers (with a low probability of abnormality) are directly removed at the same time, there will be a large pressure difference in other adsorption containers that take over the work, and the more adsorption containers are removed, the lower the efficiency. If safety is to be guaranteed, if there is no option for the step time to be cut in that meets the safe step number range in the embodiment of the present disclosure, then one can only wait until the step time of the process step with a small pressure difference, so that the entire pressure swing adsorption system will have to wait for a period of time, and waiting for a cycle may take tens of minutes, and the stability and efficiency of the operation are greatly reduced.

[0092] Moreover, if the timing is matched only for the number of adsorption containers after multiple adsorption containers are removed (for example, -2 or more), then in order to meet the number of adsorption containers corresponding to the matching timing, even if only one adsorption container is abnormal, other normal adsorption containers need to be removed, which is extremely unreasonable.

[0093] like Figure 6As shown, a schematic diagram of a module of a control device for a pressure swing adsorption system in an embodiment of the present disclosure is shown. It should be noted that the principle and technical implementation of the control device for the pressure swing adsorption system can refer to the method embodiment in the previous embodiment, so it will not be repeated in this embodiment.

[0094] The control device 600 of the pressure swing adsorption system comprises:

[0095] The process mode determination module 601 is used to determine process timing modes that match the multiple normal operating numbers of the multiple adsorption containers respectively; wherein each process timing mode corresponds to a process step sequence including multiple process steps, and each process timing mode includes: the normal operating adsorption containers arranged in a container arrangement sequence each cyclically execute process steps according to the process step sequence at each step; and each adsorption container has an interval number of steps between adjacent process steps at the same step, so as to form a preset number of adsorption containers in the adsorption step at each step; wherein, as the normal operating number of the multiple adsorption containers decreases, the process steps between the process step sequences of the corresponding process timing mode decrease.

[0096] The abnormal container removal module 602 is used to determine an abnormal adsorption container for removal in response to the adsorption container that meets the abnormal condition appearing in the plurality of adsorption containers operating according to the current process timing mode.

[0097] The container sorting module 603 is used to re-sort the remaining normally operating adsorption containers to fill the vacant positions of the abnormal adsorption containers in the current container arrangement sequence each time an abnormal adsorption container is removed, so as to form a target container arrangement sequence.

[0098] The process timing pattern matching module 604 is used to match the target process timing pattern based on the number of the remaining adsorption containers operating normally, and associate it with the target container arrangement sequence.

[0099] The step switching module 605 is used to determine the target process step in the target process timing mode to which the current process step in the current process timing mode switches for each of the remaining adsorption containers that are operating normally, and execute the switching from the current process step to the target process step; the interval number of steps between the current process step and the corresponding target process step is within the safe step number range.

[0100] It should be noted that in Figure 6Each functional module in the embodiment can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a program instruction product. The program instruction product includes one or a group of program instructions. When the program instruction is loaded and executed on a computer, the process or function according to the present disclosure is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. The program instruction can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.

[0101] and, Figure 6 The device disclosed in the embodiment can be implemented by other module division methods. The device embodiments shown above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as a group of modules or modules can be combined or dynamically added to another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or modules can be electrical or other forms.

[0102] in addition, Figure 6 Each functional module and submodule in the embodiment can be dynamically in a processing component, or each module can exist physically separately, or two or more modules can be dynamically in one component. The above-mentioned dynamic components can be implemented in the form of hardware or in the form of software functional modules. If the above-mentioned dynamic components are implemented in the form of software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. The storage medium can be a read-only memory, a disk or an optical disk, etc.

[0103] It should be particularly noted that the process or method represented by the flowchart of the above embodiment of the present disclosure can be understood as representing a module, fragment or part of a code including one or more sets of executable instructions configured to implement the steps of a specific logical function or process. And the scope of the preferred embodiment of the present disclosure includes other implementations, in which the functions may not be performed in the order shown or discussed, including performing the functions in a substantially simultaneous manner or in a reverse order according to the functions involved.

[0104] For example, Figure 2 The order of the steps in the method embodiment may be changed in a specific scenario and is not limited to the above.

[0105] like Figure 7 , which shows a schematic diagram of the structure of a computer device in one embodiment of the present disclosure.

[0106] The computer device 700 may be, for example, a server, a desktop computer, a laptop computer, a tablet computer, a smart phone or a controller, etc. In some embodiments, the computer device may be implemented as a host computer, a controller, etc. in a pressure swing adsorption system, and may be directly or indirectly coupled to and control the valve state of the adsorption container, thereby setting the state of the adsorption container (such as starting, stopping, executing each of the process steps, etc.).

[0107] The computer device 700 includes a bus 701, a processor 702, and a memory 703. The processor 702 and the memory 703 can communicate with each other through the bus 701. The memory 703 can store program instructions. The processor 702 implements the steps of the control method of the pressure swing adsorption system in the previous embodiment by running the program instructions in the memory 703, for example Figure 1 Specifically, the removal of the adsorption container in the method steps, the switching of the process steps, etc. can be achieved by controlling the control valve of the adsorption container.

[0108] The bus 701 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, although only one thick line is used in the figure, it does not mean that there is only one bus or one type of bus.

[0109] In some embodiments, the processor 702 may be implemented as a central processing unit (CPU), a microprocessing unit (MCU), a system on chip (System On Chip), or a field programmable logic array (FPGA). The memory 703 may include a volatile memory (Volatile Memory) for temporary storage of data when running a program, such as a random access memory (Random Access Memory, RAM).

[0110] The memory 703 may also include a non-volatile memory (non-volatile memory) for data storage, such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD), or a solid-state disk (SSD).

[0111] In some embodiments, the computer device 700 may further include a communicator 704. The communicator 704 is used to communicate with the outside. In a specific example, the communicator 704 may include one or a group of wired and / or wireless communication circuit modules. For example, the communicator 704 may include one or more of a wired network card, a USB module, a serial interface module, etc. The wireless communication protocols followed by the wireless communication module include: for example, near field communication (NFC) technology, infrared (IR) technology, Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time-Division Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), Bluetooth (BT), Global Navigation Satellite System (GNSS), etc. One or more.

[0112] In an embodiment of the present disclosure, a computer-readable storage medium may be provided, storing program instructions, which implement the control method of the pressure swing adsorption system in the previous embodiment when the program instructions are executed.

[0113] That is, the method steps in the above embodiments are implemented as software or computer code that can be stored in a recording medium (such as a CD ROM, RAM, floppy disk, hard disk or magneto-optical disk), or are implemented as computer code originally stored in a remote recording medium or a non-temporary machine-readable medium downloaded via a network and to be stored in a local recording medium, so that the method represented herein can be stored in such software processing on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an ASIC or FPGA).

[0114] In summary, the control method, device, system and storage medium of the pressure swing adsorption system are provided in the embodiments of the present disclosure. The method includes: determining process timing modes that match the multiple normal operating numbers of the multiple adsorption containers respectively; in response to the appearance of an abnormal adsorption container that meets the abnormal condition among the multiple adsorption containers currently in operation, cutting off the abnormal adsorption container; the multiple adsorption containers operate according to the matched current process timing mode; when each abnormal adsorption container is cut off, re-arrange to form a target container arrangement sequence; match the target process timing mode based on the number of the remaining normal adsorption containers, and associate it with the target container arrangement sequence; determine the target step time to which each of the remaining normal adsorption containers is switched from the current step time and execute process step switching. The embodiments of the present disclosure can achieve that when the abnormal adsorption container is cut off, the remaining normal adsorption containers can work according to the process timing mode of the number after cutting off, and the process step switching with constant pressure or small pressure change during the timing change can achieve safe and non-disruptive fault removal.

[0115] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. A control method for a pressure swing adsorption system, characterized in that: The pressure swing adsorption system includes a plurality of adsorption vessels; The control method comprises: Determine process timing patterns that match the multiple normal operating numbers of the multiple adsorption containers respectively; wherein each process timing pattern corresponds to a process step sequence including multiple process steps, and each process timing pattern includes: the normal operating adsorption containers arranged in a container arrangement sequence each cyclically execute process steps according to the process step sequence at each step; and each adsorption container has an interval number of steps between adjacent process steps at the same step, so as to form a preset number of adsorption containers in the adsorption step at each step; wherein, as the normal operating number of the multiple adsorption containers decreases, the process steps in the process step sequence of the corresponding process timing pattern decrease; the reduced process steps include: at least one process step with the relatively lowest pressure among the process steps; and pairs of pressure equalization and pressure equalization steps with the relatively lowest pressure; In response to an adsorption container meeting an abnormal condition appearing in the plurality of adsorption containers operating in accordance with the current process timing mode, determining it as an abnormal adsorption container for removal; When each abnormal adsorption container is removed, the remaining normally operating adsorption containers are reordered to take over the vacant positions of the abnormal adsorption containers in the current container arrangement sequence to form a target container arrangement sequence; Matching a target process timing pattern based on the number of remaining adsorption vessels operating normally and associating it with the target vessel arrangement sequence; Determine the target process step of the target process timing mode switched from the current process step of the current step in the current process timing mode to the target process step of the target process timing mode, and perform the switching from the current process step to the target process step; the interval number of steps between the current process step and the corresponding target process step is within the safe step number range; the determination of the target process step of the target process timing mode switched from the current process step of the current step in the current process timing mode to the target process step of the target process timing mode for each of the other adsorption containers operating normally comprises: based on the position of the abnormal adsorption container in the current container arrangement sequence and the current step time, determine the target step time of each of the adsorption containers operating normally in the target container arrangement sequence in the target process timing mode; wherein the interval number of steps between the process step of each of the adsorption containers operating normally at the target step time and the process step at the current step time is within the safe step number range; switch each of the adsorption containers operating normally to the process step corresponding to the target step time; The adsorption container that has resumed normal operation is restored to the pre-cut-off container arrangement sequence before being cut off, and the pre-cut-off process timing mode before being cut off is applied, including: based on the position of the adsorption container to be restored in the pre-cut-off container arrangement sequence, determining the to-be-cut-out step in the post-cut-off process timing mode and the to-be-cut-in step in the pre-cut-off process timing mode; wherein, in the to-be-cut-in step, the adsorption container to be restored is in one of several process steps with the lowest pressure in the process step sequence before cutting off, and the process steps in other adsorption containers and the to-be-cut-out step are the same or the interval steps are within the safe step number range.

2. The control method of the pressure swing adsorption system according to claim 1, characterized in that: The abnormal conditions include: a valve state error of a control valve of the adsorption container and / or a pressure exceeding a preset range.

3. The control method of the pressure swing adsorption system according to claim 1, characterized in that: Each of the process timing modes has the same preset number; and / or the reduced number of process steps and the number of interval steps are determined based on the preset number.

4. A computer device, characterized in that: include: Processor and memory; The memory stores program instructions; The processor is used to run the program instructions to execute the control method of the pressure swing adsorption system according to any one of claims 1 to 3.

5. A pressure swing adsorption system, characterized in that: include: A plurality of adsorption containers are connected to the outside via pipelines provided with control valves; A control device for controlling each of the control valves to set the state of the corresponding adsorption container; The control device comprises: a processor and a memory; the memory stores program instructions; the processor is used to run the program instructions to execute the control method of the pressure swing adsorption system according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that: Program instructions are stored, and the program instructions are executed to perform the control method of the pressure swing adsorption system according to any one of claims 1 to 3.

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