CN111545013A - Control method and control system of pressure swing adsorption system - Google Patents
Control method and control system of pressure swing adsorption system Download PDFInfo
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- CN111545013A CN111545013A CN202010392350.2A CN202010392350A CN111545013A CN 111545013 A CN111545013 A CN 111545013A CN 202010392350 A CN202010392350 A CN 202010392350A CN 111545013 A CN111545013 A CN 111545013A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40007—Controlling pressure or temperature swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40007—Controlling pressure or temperature swing adsorption
- B01D2259/40009—Controlling pressure or temperature swing adsorption using sensors or gas analysers
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Abstract
The application discloses control method and control system of pressure swing adsorption system, wherein, pressure swing adsorption system's control method has set for automatic excision condition and has forced the tower condition of cutting, through obtaining the pressure variation of adsorption tower under current state, every the valve state of adsorption tower, every the on-off state of the first class valve and the second class valve of adsorption tower realizes the automatic control whether excision of adsorption tower among the pressure swing adsorption system according to above-mentioned two conditions for the condition standardization whether excision of every adsorption tower, has avoided relying on managers' experience to carry out excision control probably to the adsorption tower and in time or judge the wrong scheduling problem. In addition, the pressure swing adsorption system also sets automatic shutdown conditions, realizes the automatic shutdown control of the pressure swing adsorption system by acquiring the number of the adsorption towers in the current operation state, and avoids the problem of low gas purification quality possibly caused by the fact that the number of the adsorption towers in the current operation state is too small.
Description
Technical Field
The present disclosure relates to the field of automatic control technologies, and more particularly, to a control method and a control system for a pressure swing adsorption system.
Background
Pressure Swing Adsorption (PSA), a novel gas Adsorption separation technology, has the following advantages: the product purity is high; the method can generally work at room temperature and low pressure, the bed layer does not need to be heated during regeneration, and the product purity is high; the equipment is simple, and the operation and the maintenance are simple and convenient; the continuous circulation operation can achieve the automation completely.
When a pressure swing adsorption system is used for adsorption of gases such as hydrogen (taking hydrogen as an example), non-permeate gas separated from a membrane enters a PSA system, free liquid phase substances in hydrogen-rich gas are separated by a gas-liquid separator, then the gas enters an adsorption tower in an adsorption state from the bottom of the adsorption tower, one adsorption tower is in an adsorption state at any time, CO2, CH4, CO, H20, N2, C3, C4, C5 and Ar in raw material gas are stopped on the surface of adsorbents under the action of different adsorbents in a bed layer, and hydrogen is obtained by adsorption from the top of the adsorption tower as a non-adsorption component (purity > 95%) and is subjected to pressure stabilization and then enters a boundary zone.
In the prior art, the state control of each adsorption tower in the pressure swing adsorption system is usually judged by a manager, the removal of each adsorption tower when a fault occurs also needs to be judged by the manager according to experience, the experience dependence on the manager is very high, the influence of artificial factors (skill level and working state) on production is very obvious, and if the adsorption tower with the fault in the pressure swing adsorption system is not removed in time, the quality of hydrogen purification can be possibly caused, and serious adverse effects are brought to subsequent production.
Disclosure of Invention
In order to solve the technical problems, the application provides a control method and a control system of a pressure swing adsorption system, so as to achieve the purpose of automatically controlling each adsorption tower in the pressure swing adsorption system, and avoid the problem that management personnel can not timely remove a faulty adsorption tower due to removal of the adsorption tower by simply relying on experience.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a method of controlling a pressure swing adsorption system, the pressure swing adsorption system including a plurality of adsorption columns, the method of controlling a pressure swing adsorption system comprising:
acquiring the pressure change of each adsorption tower in the current state and the valve state of each adsorption tower, and cutting off the adsorption towers when the pressure change of the adsorption towers in the current state and the valve state meet the automatic cutting-off condition;
acquiring the switching states of a first type valve and a second type valve of each adsorption tower, and cutting off the adsorption tower when the switching states of the first type valve and the second type valve meet a forced tower cutting condition;
and acquiring the number of the adsorption towers in the current running state, and stopping running the pressure swing adsorption system when the number of the adsorption towers in the current running state is less than the preset number.
Optionally, the method further includes:
when the cut adsorption tower needs to be recovered to operate, acquiring the current pressure value of the recovery tower, determining the operating state corresponding to the pressure to be recovered according to the current pressure value, and recovering the adsorption tower to operate in the operating state corresponding to the pressure to be recovered.
Optionally, the obtaining a current pressure value of the recovery tower, and determining an operating state corresponding to a pressure to be recovered according to the current pressure value includes:
judging the serial number of a pressure interval to which the pressure to be recovered belongs, and determining the running state corresponding to the pressure to be recovered as an n average decreasing state according to the serial number of the pressure interval; wherein n represents the serial number of the pressure interval;
the dividing process of the pressure interval comprises the following steps:
acquiring a standard pressure value, wherein the standard pressure value is the maximum pressure value of all adsorption towers in the pressure swing adsorption system in an adsorption state;
from
And P0 is divided into N intervals, wherein N represents the pressure equalizing times after the absorption tower recovers, and P0 represents the standard pressure value.
Optionally, when the current state of the adsorption tower is a final-rising state:
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the terminal rising state;
the automatic resection conditions include: the deviation of the difference value between the pressure value 3 seconds before the end of the final rising state and the first preset gas pressure exceeds a first preset value, and any first type valve or any second type valve of the adsorption tower alarms or fails;
when the current state of the adsorption tower is a reverse discharge state;
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the reverse state;
the automatic resection conditions include: the pressure value 3 seconds before the reverse discharge state is finished is less than 0.1MPa, and any first valve or any second valve of the adsorption tower gives an alarm or fails;
when the current state of the adsorption tower is other states;
the pressure change of the adsorption tower in the current state comprises the following steps: and the absolute value of the difference value of the pressure values of the second and the ninth second in the current state is greater than a second preset value, and any first type valve or any second type valve of the adsorption tower gives an alarm or fails.
Optionally, the removing the adsorption tower when the on-off states of the first type valve and the second type valve satisfy a forced tower-switching condition includes:
and when any one of the first type valves and any one of the second type valves are in an open state at the same time, cutting off the adsorption tower.
A control system for a pressure swing adsorption system, the pressure swing adsorption system including a plurality of adsorption columns, the control system for a pressure swing adsorption system comprising:
the automatic tower cutting module is used for acquiring the pressure change of each adsorption tower in the current state and the valve state of each adsorption tower, and cutting off the adsorption towers when the pressure change of the adsorption towers in the current state and the valve state meet the automatic cutting-off condition;
the forced tower cutting module is used for acquiring the switching states of a first type valve and a second type valve of each adsorption tower, and cutting off the adsorption tower when the switching states of the first type valve and the second type valve meet the forced tower cutting condition;
and the automatic shutdown module is used for acquiring the number of the adsorption towers in the current running state and stopping running the pressure swing adsorption system when the number of the adsorption towers in the current running state is less than the preset number.
Optionally, the method further includes:
and the automatic recovery module is used for acquiring the current pressure value of the recovery tower when the cut adsorption tower needs to be recovered to operate, determining the operation state corresponding to the pressure to be recovered according to the current pressure value, and recovering the adsorption tower to the operation state corresponding to the pressure to be recovered to operate.
Optionally, the automatic recovery module obtains a current pressure value of the recovery tower, determines an operating state corresponding to a pressure to be recovered according to the current pressure value, specifically, determines a serial number of a pressure interval to which the pressure to be recovered belongs, and determines the operating state corresponding to the pressure to be recovered as an n-average decreasing state according to the serial number of the pressure interval; wherein n represents the serial number of the pressure interval;
the dividing process of the pressure interval comprises the following steps:
acquiring a standard pressure value, wherein the standard pressure value is the maximum pressure value of all adsorption towers in the pressure swing adsorption system in an adsorption state;
from
And P0 is divided into N intervals, wherein N represents the pressure equalizing times after the absorption tower recovers, and P0 represents the standard pressure value.
Optionally, when the current state of the adsorption tower is a final-rising state:
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the terminal rising state;
the automatic resection conditions include: the deviation of the difference value between the pressure value 3 seconds before the end of the final rising state and the first preset gas pressure exceeds a first preset value, and any first type valve or any second type valve of the adsorption tower alarms or fails;
when the current state of the adsorption tower is a reverse discharge state;
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the reverse state;
the automatic resection conditions include: the pressure value 3 seconds before the reverse discharge state is finished is less than 0.1MPa, and any first valve or any second valve of the adsorption tower gives an alarm or fails;
when the current state of the adsorption tower is other states;
the pressure change of the adsorption tower in the current state comprises the following steps: and the absolute value of the difference value of the pressure values of the second and the ninth second in the current state is greater than a second preset value, and any first type valve or any second type valve of the adsorption tower gives an alarm or fails.
Optionally, the forced cut tower module is specifically configured to cut off the adsorption tower when any one of the first type valves and any one of the second type valves are in an open state at the same time.
It can be seen from the foregoing technical solutions that, in the control method of the pressure swing adsorption system, an automatic cut condition and a forced cut condition are set, and by obtaining a pressure change of an adsorption tower in a current state, a valve state of each adsorption tower, and an on-off state of a first type valve and a second type valve of each adsorption tower, an automatic control on whether the adsorption tower is cut in the pressure swing adsorption system is achieved according to the two conditions, so that a condition on whether each adsorption tower is cut is standardized, and problems that cutting is not timely or judgment is wrong and the like possibly caused by cutting control of the adsorption tower depending on experience of a manager are avoided.
In addition, the pressure swing adsorption system also sets automatic shutdown conditions, realizes the automatic shutdown control of the pressure swing adsorption system by acquiring the number of the adsorption towers in the current operation state, and avoids the problem of low gas purification quality possibly caused by the fact that the number of the adsorption towers in the current operation state is too small.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a method for controlling a pressure swing adsorption system according to one embodiment of the present application;
FIG. 2 is a schematic view of the operating conditions of a pressure swing adsorption system;
fig. 3 is a schematic flow chart of a control method of a pressure swing adsorption system according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides a control method of a pressure swing adsorption system, as shown in fig. 1, where the pressure swing adsorption system includes a plurality of adsorption towers, and the control method of the pressure swing adsorption system includes:
s101: acquiring the pressure change of each adsorption tower in the current state and the valve state of each adsorption tower, and cutting off the adsorption towers when the pressure change of the adsorption towers in the current state and the valve state meet the automatic cutting-off condition;
s102: acquiring the switching states of a first type valve and a second type valve of each adsorption tower, and cutting off the adsorption tower when the switching states of the first type valve and the second type valve meet a forced tower cutting condition;
s103: and acquiring the number of the adsorption towers in the current running state, and stopping running the pressure swing adsorption system when the number of the adsorption towers in the current running state is less than the preset number.
The control method of the pressure swing adsorption system sets automatic cutting conditions and forced tower cutting conditions, and realizes automatic control on cutting of the adsorption tower in the pressure swing adsorption system according to the two conditions by obtaining the pressure change of the adsorption tower in the current state, the valve state of each adsorption tower and the switch states of the first type valve and the second type valve of each adsorption tower, so that the cutting conditions of each adsorption tower are standardized, and the problems of untimely cutting or judgment errors and the like possibly caused by cutting control of the adsorption tower depending on the experience of management personnel are avoided.
In addition, the pressure swing adsorption system also sets an automatic shutdown condition (namely the number of the adsorption towers in the current operation state is less than the preset number), and the automatic shutdown control of the pressure swing adsorption system is realized by acquiring the number of the adsorption towers in the current operation state, so that the problem of low gas purification quality possibly caused by the fact that the number of the adsorption towers in the current operation state is too small is solved.
The principle of pressure swing adsorption is based on the principle that the impurity component in the mixed gas has a large adsorption capacity at high pressure and a small adsorption capacity at low pressure, while the ideal component H2 has a small adsorption capacity at both high pressure and low pressure. Under high pressure, the partial pressure of impurities is increased to adsorb the impurities on the adsorbent as much as possible, so that high product purity is achieved.
Assuming that the number of the adsorption columns in the pressure swing adsorption system is ten, the operation state of the pressure swing adsorption system can refer to fig. 2, and in fig. 2, the X-Y-Z pattern represents that the number of the adsorption columns is X, the number of the adsorption columns in the adsorption state is Y, and the number of pressure equalization times is Z. For example, the 10-1-6 pattern indicates that the number of adsorption columns is 10, the number of adsorption columns in an adsorption state is 1, and the number of pressure equalization times is 6.
The operating conditions of each adsorption column in the pressure swing adsorption system may include: adsorption (denoted by a), homogeneous drop (denoted by E1D), homogeneous drop (denoted by E2D), homogeneous drop (denoted by E3D), homogeneous drop (denoted by E4D), homogeneous drop (denoted by E5D), homogeneous drop six (denoted by E6D), simultaneous play (denoted by EE), simultaneous play (denoted by D), rinse (denoted by P), homogeneous rise six (denoted by E6R), homogeneous rise five (denoted by E5R), homogeneous rise four (denoted by E4R), homogeneous rise three (denoted by E3R), homogeneous rise two (denoted by E2R), homogeneous rise one (denoted by E1R), and homogeneous rise final rise (denoted by FR). The number of steps in the 10-1-6 mode is usually 20 steps.
On the basis of the above embodiments, in an embodiment of the present application, as shown in fig. 3, the control method of the pressure swing adsorption system further includes:
s104: when the cut adsorption tower needs to be recovered to operate, acquiring the current pressure value of the recovery tower, determining the operating state corresponding to the pressure to be recovered according to the current pressure value, and recovering the adsorption tower to operate in the operating state corresponding to the pressure to be recovered.
The operation of the adsorption tower that needs to be resumed may be performed when a manager sends a start instruction to the adsorption tower, or may be performed when the recovery operation condition is satisfied after the trouble removal of the adsorption tower is completed. The present application does not limit the state, and the state is determined according to the actual situation.
In this embodiment, a control method for automatically recovering operation is further provided, so that the full-flow control from the cut-off to the recovery operation of the adsorption tower is realized.
Specifically, the obtaining of the current pressure value of the recovery tower and the determining of the operating state corresponding to the pressure to be recovered according to the current pressure value includes:
judging the serial number of a pressure interval to which the pressure to be recovered belongs, and determining the running state corresponding to the pressure to be recovered as an n average decreasing state according to the serial number of the pressure interval; wherein n represents the serial number of the pressure interval;
the dividing process of the pressure interval comprises the following steps:
acquiring a standard pressure value, wherein the standard pressure value is the maximum pressure value of all adsorption towers in the pressure swing adsorption system in an adsorption state;
from
And P0 is divided into N intervals, wherein N represents the pressure equalizing times after the absorption tower recovers, and P0 represents the standard pressure value.
In particular, when
And when the running state of END is recovered, END indicates that N is all reduced.
The following describes specific determination conditions of each step in the control method of the pressure swing adsorption system provided in the embodiment of the present application.
In another embodiment of the present application, when the current state of the adsorption column is a final-rise state:
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the terminal rising state;
the automatic resection conditions include: the deviation of the difference value between the pressure value 3 seconds before the end of the final rising state and the first preset gas pressure exceeds a first preset value, and any first type valve or any second type valve of the adsorption tower alarms or fails;
when the current state of the adsorption tower is a reverse discharge state;
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the reverse state;
the automatic resection conditions include: the pressure value 3 seconds before the reverse discharge state is finished is less than 0.1MPa, and any first valve or any second valve of the adsorption tower gives an alarm or fails;
when the current state of the adsorption tower is other states;
the pressure change of the adsorption tower in the current state comprises the following steps: and the absolute value of the difference value of the pressure values of the second and the ninth second in the current state is greater than a second preset value, and any first type valve or any second type valve of the adsorption tower gives an alarm or fails.
In this embodiment, the pressure value 3 seconds before the end of the terminal rising state may be an average pressure value 3 seconds before the end of the terminal rising state, or may be a pressure value 3 seconds before the end of the terminal rising state; similarly, the pressure value 3 seconds before the end of the reverse state may be an average pressure value 3 seconds before the end of the reverse state, or may be a pressure value 3 seconds before the end of the reverse state.
The specific values of the first preset value and the second preset value can be set in advance according to the type of the adsorption tower and the experience of managers.
In yet another embodiment of the present application, the switching off the adsorption column when the on-off states of the first type valve and the second type valve satisfy a forced cut column condition includes:
and when any one of the first type valves and any one of the second type valves are in an open state at the same time, cutting off the adsorption tower.
The first type of valve may be a high pressure valve of the adsorption column (e.g., valves numbered XV8101A, XV8102A, XV 81603A), and the second type of valve may be a low pressure valve of the adsorption column (e.g., valves numbered XV8108A, XV 8109A).
When any one of the first type valves and any one of the second type valves are simultaneously opened, a cross-pressure accident of the adsorption tower may occur, and thus, the adsorption tower is forcibly cut off when this state occurs.
The following describes a control system of a pressure swing adsorption system provided in an embodiment of the present application, and the control system of the pressure swing adsorption system described below may be referred to in correspondence with the control method of the pressure swing adsorption system described above.
Correspondingly, the embodiment of the present application provides a control system of a pressure swing adsorption system, the pressure swing adsorption system includes a plurality of adsorption towers, the control system of the pressure swing adsorption system includes:
the automatic tower cutting module is used for acquiring the pressure change of each adsorption tower in the current state and the valve state of each adsorption tower, and cutting off the adsorption towers when the pressure change of the adsorption towers in the current state and the valve state meet the automatic cutting-off condition;
the forced tower cutting module is used for acquiring the switching states of a first type valve and a second type valve of each adsorption tower, and cutting off the adsorption tower when the switching states of the first type valve and the second type valve meet the forced tower cutting condition;
and the automatic shutdown module is used for acquiring the number of the adsorption towers in the current running state and stopping running the pressure swing adsorption system when the number of the adsorption towers in the current running state is less than the preset number.
Optionally, the method further includes:
and the automatic recovery module is used for acquiring the current pressure value of the recovery tower when the cut adsorption tower needs to be recovered to operate, determining the operation state corresponding to the pressure to be recovered according to the current pressure value, and recovering the adsorption tower to the operation state corresponding to the pressure to be recovered to operate.
Optionally, the automatic recovery module obtains a current pressure value of the recovery tower, determines an operating state corresponding to a pressure to be recovered according to the current pressure value, specifically, determines a serial number of a pressure interval to which the pressure to be recovered belongs, and determines the operating state corresponding to the pressure to be recovered as an n-average decreasing state according to the serial number of the pressure interval; wherein n represents the serial number of the pressure interval;
the dividing process of the pressure interval comprises the following steps:
acquiring a standard pressure value, wherein the standard pressure value is the maximum pressure value of all adsorption towers in the pressure swing adsorption system in an adsorption state;
from
And P0 is divided into N intervals, wherein N represents the pressure equalizing times after the absorption tower recovers, and P0 represents the standard pressure value.
Optionally, when the current state of the adsorption tower is a final-rising state:
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the terminal rising state;
the automatic resection conditions include: the deviation of the difference value between the pressure value 3 seconds before the end of the final rising state and the first preset gas pressure exceeds a first preset value, and any first type valve or any second type valve of the adsorption tower alarms or fails;
when the current state of the adsorption tower is a reverse discharge state;
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the reverse state;
the automatic resection conditions include: the pressure value 3 seconds before the reverse discharge state is finished is less than 0.1MPa, and any first valve or any second valve of the adsorption tower gives an alarm or fails;
when the current state of the adsorption tower is other states;
the pressure change of the adsorption tower in the current state comprises the following steps: and the absolute value of the difference value of the pressure values of the second and the ninth second in the current state is greater than a second preset value, and any first type valve or any second type valve of the adsorption tower gives an alarm or fails.
Optionally, the forced cut tower module is specifically configured to cut off the adsorption tower when any one of the first type valves and any one of the second type valves are in an open state at the same time.
In summary, the embodiment of the present application provides a control method and a control system for a pressure swing adsorption system, wherein the control method for the pressure swing adsorption system sets an automatic removal condition and a forced tower-cutting condition, and realizes automatic control of whether an adsorption tower is removed in the pressure swing adsorption system according to the two conditions by obtaining the pressure change of the adsorption tower in the current state, the valve state of each adsorption tower, and the switch states of the first type valve and the second type valve of each adsorption tower, so that the condition of whether each adsorption tower is removed is standardized, and the problems of removal untimely or judgment error and the like possibly caused by removal control of the adsorption tower depending on the experience of a manager are avoided.
In addition, the pressure swing adsorption system also sets automatic shutdown conditions, realizes the automatic shutdown control of the pressure swing adsorption system by acquiring the number of the adsorption towers in the current operation state, and avoids the problem of low gas purification quality possibly caused by the fact that the number of the adsorption towers in the current operation state is too small.
Features described in the embodiments in the present specification may be replaced with or combined with each other, each embodiment is described with a focus on differences from other embodiments, and the same and similar portions among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A control method of a pressure swing adsorption system, wherein the pressure swing adsorption system comprises a plurality of adsorption towers, and the control method of the pressure swing adsorption system comprises the following steps:
acquiring the pressure change of each adsorption tower in the current state and the valve state of each adsorption tower, and cutting off the adsorption towers when the pressure change of the adsorption towers in the current state and the valve state meet the automatic cutting-off condition;
acquiring the switching states of a first type valve and a second type valve of each adsorption tower, and cutting off the adsorption tower when the switching states of the first type valve and the second type valve meet a forced tower cutting condition;
and acquiring the number of the adsorption towers in the current running state, and stopping running the pressure swing adsorption system when the number of the adsorption towers in the current running state is less than the preset number.
2. The method of claim 1, further comprising:
when the cut adsorption tower needs to be recovered to operate, acquiring the current pressure value of the recovery tower, determining the operating state corresponding to the pressure to be recovered according to the current pressure value, and recovering the adsorption tower to operate in the operating state corresponding to the pressure to be recovered.
3. The method of claim 2, wherein the obtaining a current pressure value of the recovery tower and determining an operating state corresponding to a pressure to be recovered according to the current pressure value comprises:
judging the serial number of a pressure interval to which the pressure to be recovered belongs, and determining the running state corresponding to the pressure to be recovered as an n average decreasing state according to the serial number of the pressure interval; wherein n represents the serial number of the pressure interval;
the dividing process of the pressure interval comprises the following steps:
acquiring a standard pressure value, wherein the standard pressure value is the maximum pressure value of all adsorption towers in the pressure swing adsorption system in an adsorption state;
from
And P0 is divided into N intervals, wherein N represents the pressure equalizing times after the absorption tower recovers, and P0 represents the standard pressure value.
4. The method of claim 1, wherein when the current state of the adsorption column is a final-rise state:
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the terminal rising state;
the automatic resection conditions include: the deviation of the difference value between the pressure value 3 seconds before the end of the final rising state and the first preset gas pressure exceeds a first preset value, and any first type valve or any second type valve of the adsorption tower alarms or fails;
when the current state of the adsorption tower is a reverse discharge state;
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the reverse state;
the automatic resection conditions include: the pressure value 3 seconds before the reverse discharge state is finished is less than 0.1MPa, and any first valve or any second valve of the adsorption tower gives an alarm or fails;
when the current state of the adsorption tower is other states;
the pressure change of the adsorption tower in the current state comprises the following steps: and the absolute value of the difference value of the pressure values of the second and the ninth second in the current state is greater than a second preset value, and any first type valve or any second type valve of the adsorption tower gives an alarm or fails.
5. The method of claim 1, wherein said removing the adsorption column when the on-off states of the first type of valve and the second type of valve satisfy a forced column cut condition comprises:
and when any one of the first type valves and any one of the second type valves are in an open state at the same time, cutting off the adsorption tower.
6. A control system for a pressure swing adsorption system, the pressure swing adsorption system including a plurality of adsorption columns, the control system comprising:
the automatic tower cutting module is used for acquiring the pressure change of each adsorption tower in the current state and the valve state of each adsorption tower, and cutting off the adsorption towers when the pressure change of the adsorption towers in the current state and the valve state meet the automatic cutting-off condition;
the forced tower cutting module is used for acquiring the switching states of a first type valve and a second type valve of each adsorption tower, and cutting off the adsorption tower when the switching states of the first type valve and the second type valve meet the forced tower cutting condition;
and the automatic shutdown module is used for acquiring the number of the adsorption towers in the current running state and stopping running the pressure swing adsorption system when the number of the adsorption towers in the current running state is less than the preset number.
7. The system of claim 6, further comprising:
and the automatic recovery module is used for acquiring the current pressure value of the recovery tower when the cut adsorption tower needs to be recovered to operate, determining the operation state corresponding to the pressure to be recovered according to the current pressure value, and recovering the adsorption tower to the operation state corresponding to the pressure to be recovered to operate.
8. The system according to claim 7, wherein the automatic recovery module obtains a current pressure value of the recovery tower, determines an operating state corresponding to a pressure to be recovered according to the current pressure value, specifically, determines a serial number of a pressure interval to which the pressure to be recovered belongs, and determines the operating state corresponding to the pressure to be recovered as an n-average decreasing state according to the serial number of the pressure interval; wherein n represents the serial number of the pressure interval;
the dividing process of the pressure interval comprises the following steps:
acquiring a standard pressure value, wherein the standard pressure value is the maximum pressure value of all adsorption towers in the pressure swing adsorption system in an adsorption state;
from
And P0 is divided into N intervals, wherein N represents the pressure equalizing times after the absorption tower recovers, and P0 represents the standard pressure value.
9. The system of claim 6, wherein when the current state of the adsorption column is a final-rise state:
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the terminal rising state;
the automatic resection conditions include: the deviation of the difference value between the pressure value 3 seconds before the end of the final rising state and the first preset gas pressure exceeds a first preset value, and any first type valve or any second type valve of the adsorption tower alarms or fails;
when the current state of the adsorption tower is a reverse discharge state;
the pressure change of the adsorption tower in the current state comprises the following steps: pressure value 3 seconds before the end of the reverse state;
the automatic resection conditions include: the pressure value 3 seconds before the reverse discharge state is finished is less than 0.1MPa, and any first valve or any second valve of the adsorption tower gives an alarm or fails;
when the current state of the adsorption tower is other states;
the pressure change of the adsorption tower in the current state comprises the following steps: and the absolute value of the difference value of the pressure values of the second and the ninth second in the current state is greater than a second preset value, and any first type valve or any second type valve of the adsorption tower gives an alarm or fails.
10. The system of claim 6, wherein the forced cut column module is specifically configured to cut the adsorption column when any of the first type of valve and any of the second type of valve are simultaneously in an open state.
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