CN112316664A - System for accurately controlling pressure swing adsorption, pressure equalization, sequential discharge and flushing processes and use method thereof - Google Patents
System for accurately controlling pressure swing adsorption, pressure equalization, sequential discharge and flushing processes and use method thereof Download PDFInfo
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- 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
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- B01D53/047—Pressure swing adsorption
- B01D53/053—Pressure swing adsorption with storage or buffer vessel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention discloses a system for accurately controlling pressure swing adsorption, pressure equalization, sequential discharge and flushing processes, which comprises a raw material gas conveying pipe, a plurality of adsorption towers with the bottoms connected with the raw material gas conveying pipe, a flushing pipe and a reverse pressure reducing pipe connected with the bottom of each adsorption tower, a product gas outward conveying pipe connected with the top of the adsorption tower, a pressure equalizing mechanism connected with each product gas outward conveying pipe, a flushing mechanism with one end connected with the pressure equalizing mechanism and the other end connected with each product gas outward conveying pipe, the system comprises a final rising pipe connected with each product gas outward conveying pipe, a first program control valve arranged on a connecting pipeline between a raw gas conveying pipe and the bottom of each adsorption tower, a connecting pipeline between a flushing pipe and the bottom of each adsorption tower, a connecting pipeline between a reverse-releasing pressure reducing pipe and the bottom of each adsorption tower, and a product gas outward conveying pipe, and pressure transmitters arranged on each adsorption tower and a flushing mechanism. The invention has less disturbance to the adsorption tower and is more beneficial to forming stable booster piston flow.
Description
Technical Field
The invention relates to the technical field of industrial gas separation and purification equipment, in particular to a system for accurately controlling pressure swing adsorption, pressure equalization, sequential discharge and flushing processes and a using method thereof.
Background
At present, the pressure swing adsorption technology is widely applied to the industries of oil refining, chemical engineering and the like. In terms of technology, the pressure swing adsorption technology has two technological processes of flushing and vacuum, and no matter what technological process is selected, pressure equalizing and reducing and pressure equalizing and increasing processes are carried out to improve the recovery rate of the device. The higher the adsorption pressure is, the more the pressure equalizing frequency is, the lower the adsorption pressure is, the less the pressure equalizing frequency is, and the process of pressure equalizing and reducing or pressure equalizing and increasing inevitably scours the adsorbent and the program control valve, so that the whole service life of the device is influenced.
Finding out in engineering operation: in the prior art, the pressure equalizing speed and the pressure equalizing time of a pressure swing adsorption system are not controllable, so that the adsorbent in an adsorption tower is easy to boil and pulverize, a program control valve is further damaged, the service life of the adsorbent is shortened, and the product quality produced by a device and the production capacity of the device are influenced; in addition, after the tower is cut, the pressure equalizing frequency is reduced, the pressure equalizing pressure difference is increased, the adsorbent is more scoured, and the damage is more serious. Even if some equipment can adjust the change of the flow rate and the pressure of certain gas through the control to the valve, the probability of boiling and powdering of the adsorbent is reduced to a certain extent, but the problem that the adjustment effect is poor and the adjustment degree is limited still exists, the valve is easy to damage by air flow impact in the process of adjusting the change of the flow rate and the pressure of the gas, the working stability of the system is influenced, and meanwhile, the accurate control cannot be realized. In the prior art, the document No. CN107349746B discloses a pressure swing adsorption method for pressure change linkage control in cyclic operation, which can perform a certain function of adjusting the flow rate and pressure of gas by opening and closing a valve combination, but the opening and closing degree of the valve cannot be well controlled, and the precise control of the change of the flow rate and pressure of gas cannot be realized by only controlling the valve combination; in addition, the valve bears stronger airflow impact during control, so that the valve is easily damaged, the operation stability of the system is further influenced, and the work of the system is influenced.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a system which has good valve stability and can accurately control the pressure swing adsorption, pressure equalization, sequential discharge and flushing processes.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a system for accurately controlling pressure swing adsorption, pressure equalization, sequential release and flushing processes comprises a raw material gas conveying pipe, a plurality of adsorption towers, a flushing pipe and a reverse release pressure reducing pipe, wherein the bottoms of the adsorption towers are connected with the raw material gas conveying pipe, the flushing pipe and the reverse release pressure reducing pipe are connected with the bottoms of the adsorption towers, a product gas outward conveying pipe is connected with the top of the adsorption tower, a pressure equalizing mechanism is connected with each product gas outward conveying pipe, a flushing mechanism is connected with the pressure equalizing mechanism at one end, the other end of the flushing mechanism is connected with each product gas outward conveying pipe, a final lifting pipe is connected with each product gas outward conveying pipe, first program control valves are arranged on a connecting pipeline between the raw material gas conveying pipe and the bottom of each adsorption tower, on a connecting pipeline between the flushing pipe and the bottom of each adsorption tower, on the product gas outward conveying pipe, and pressure transmitters arranged on each adsorption tower and each flushing mechanism, the final lifting pipe is connected with a pressure equalizing mechanism through a pipeline, and the opening degree of the pressure equalizing mechanism and the opening degree of the flushing mechanism are controlled through software.
Specifically, the pressure equalizing mechanism comprises a plurality of pressure equalizing pipes which are connected in parallel and are respectively connected with each product gas external transmission pipe through a pipeline, a second program control valve which is arranged on the product gas external transmission pipe and the pressure equalizing pipe connecting pipeline, and a pressure adjusting valve which is connected between two adjacent pressure equalizing pipes, wherein the number of the pressure equalizing pipes is at least 2, the flushing mechanism is connected with one of the pressure equalizing pipes, the final-rising pipe is connected with one of the pressure equalizing pipes, and the opening degree of the pressure adjusting valve is controlled through software.
Specifically, a final lift regulating valve is installed on a connecting pipeline of the final lift pipe and the pressure equalizing pipe.
Specifically, wash the mechanism include with the in the same direction as of a pressure-equalizing pipe connection put the pipe, the air inlet with in the same direction as of putting union coupling put the gas buffer tank, one end with in the same direction as put gas buffer tank gas outlet connection and the other end and every product gas outer transport pipe line connection wash the inlet tube, install in proper order in the same direction as first wash governing valve on putting the pipe and in the same direction as putting the public valve, install in wash the second on the entry pipeline and wash the governing valve to and install in washing the third programmable valve on entry pipeline and every product gas outer transport pipe line, wherein, pressure transmitter sets up in the same direction as on putting the gas buffer tank gas outlet, first wash governing valve and second and wash the aperture of governing valve and pass through software control.
Further, the number of adsorption towers is at least 4.
The invention also provides a use method of the system for accurately controlling the pressure swing adsorption, pressure equalization, sequential discharge and flushing processes, which comprises the following steps:
s1, pressure swing adsorption: the raw gas is input upwards from the bottom of the adsorption tower through a raw gas transmission pipe, and the product gas is output from the top of the adsorption tower, flows into a product gas outer transmission pipe, is input into a final rising pipe through the product gas outer transmission pipe and is discharged;
s2, pressure equalizing and reducing: inputting high-pressure gas into the other adsorption tower through a pressure equalizing mechanism by the adsorption tower after pressure swing adsorption, and balancing the gas pressure of the two towers;
s3, placing in sequence: the gas in the adsorption tower after pressure equalization and depressurization is input into a flushing mechanism through a product gas outer conveying pipe and a pressure equalization mechanism in sequence;
s4, reverse playing: discharging gas in the adsorption tower after forward arrangement through a reverse-arrangement depressurization pipe;
s5, washing: gas in the flushing mechanism sequentially passes through the product gas outward conveying pipe and the reversely placed adsorption tower, is conveyed into the flushing pipe, and is discharged through the flushing pipe;
s6, voltage equalizing and boosting: inputting the gas in the adsorption tower receiving the high-pressure gas in the step S2 into the adsorption tower after washing through a pressure equalizing mechanism, and equalizing the gas pressure of the two towers;
s7, final liter: and the product gas is input into the adsorption tower after pressure equalizing and boosting through a final lifting pipe, a pressure equalizing mechanism and a product gas external transmission pipe in sequence, and the gas pressure in the adsorption tower after pressure equalizing and boosting is adjusted.
Specifically, the pressure swing adsorption pressure of step S1 is greater than 0.02 MPag.
Specifically, the voltage equalizing step-down of step S2 and the voltage equalizing step-up number of times of step S6 are both at least one.
Compared with the prior art, the invention has the following beneficial effects:
(1) the applicant finds that the pressure transmitters are arranged on the top of the adsorption tower and in the flushing mechanism, so that the pressure of the output gas can be adjusted through the pressure transmitters, the adjustment effect of the gas pressure is improved, the output gas pressure can be adjusted more accurately, the valve can be prevented from being damaged by air flow impact in the process of adjusting the flow speed and the pressure of the gas, the working stability of the system is improved, accurate control is achieved, the accurate control of the pressure equalizing speed is realized, the instantaneous maximum speed is reduced to the minimum, the scouring of the adsorbent is reduced to the minimum, the scheme is more ideal than the existing scheme, the pulverization of the adsorbent is thoroughly avoided, the pressure equalizing speed is uniform, the disturbance to the adsorption tower is smaller, the stable boosting piston flow is more favorably formed, and the influence on the next adsorption is reduced.
(2) The invention inputs the gas flushed by the adsorption tower into the flushing mechanism for storage in the sequential release step, and then inputs the gas in the flushing mechanism into the adsorption tower for flushing in the flushing step, and in the process, the pressure transmitter arranged on the adsorption tower and the pressure transmitter arranged at the gas outlet of the sequential release buffer tank regulate the gas pressure, control the gas pressure, avoid the boiling and pulverization of the adsorbent in the adsorption tower, prolong the service life of the adsorbent, thereby prolonging the service life of the whole system; in addition, the pressure fluctuation of the forward air release buffer tank can be smaller due to the accurate forward air release control; accurate washing control can make the flow of the washing regeneration gas constant, and the washing regeneration effect is better, thereby improving the effective gas recovery rate and the economic benefit of the device.
(3) The invention can process gases with various concentrations and pressures without limiting the gases, and only needs to control the pressure when needing to process, namely only needs to combine the regulating valve and the pressure transmitter to control the pressure, and has nothing to do with the composition and the concentration of the gases, so the range of the gases which can be processed is wider, and the application area is wider.
(4) The invention controls the opening degree of the pressure regulating valve, the first flushing regulating valve and the second flushing regulating valve by software in a full-automatic regulating mode, mainly compares an SP set value (a theoretical pressure value calculated by a program according to pressure and time change) automatically calculated by the software with a P value (a pressure value actually measured by a pressure transmitter), further controls the opening degree PV value of the valve through operation, and controls the opening degree of the valve according to the PV value, so that the accurate control of the valve opening degree can be finally realized in the steps of pressure equalizing, pressure reducing, sequential placing and flushing, the pressure of the adsorption tower is ensured to be completely changed according to a pressure change curve, the accurate pressure change is completed, and the opening degree can be automatically regulated according to the pressure change of each stage.
(5) The invention is suitable for the vacuum pumping and flushing processes including the pressure equalizing process, so the application range is wider.
Drawings
Fig. 1 is a connection structure diagram of embodiment 2 of the present invention.
Wherein, the names corresponding to the reference numbers are:
1-a raw material gas conveying pipe, 2-an adsorption tower, 3-a product gas external conveying pipe, 4-a flushing pipe, 5-a reverse-release pressure reducing pipe, 6-a final rising pipe, 7-a first program control valve, 8-a pressure equalizing pipe, 9-a second program control valve, 10-a pressure regulating valve, 11-a forward releasing pipe, 12-a forward release buffer tank, 13-a flushing inlet pipe, 14-a first flushing regulating valve, 15-a forward release common valve, 16-a second flushing regulating valve, 17-a third program control valve, 18-a final rising regulating valve, 19-an adsorption tower A, 20-an adsorption tower B, 21-an adsorption tower C, 22-an adsorption tower D, 23-an adsorption tower E, 24-an adsorption tower F, 25-a fourth pressure equalizing pipe, 26-a first pressure equalizing pipe, 27-a second pressure equalizing pipe, 28-third pressure equalizer.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
The using method of the invention comprises the following steps:
s1, pressure swing adsorption: opening a first program control valve 7 arranged on a connecting pipeline of a raw gas conveying pipe 1 and an adsorption tower 2 to be adsorbed, and a first program control valve 7 on a connecting pipeline of a product gas outward conveying pipe and the same adsorption tower 2, inputting the raw gas from the bottom of the adsorption tower 2 upwards through the raw gas conveying pipe 1, outputting the product gas from the top of the adsorption tower 2, flowing into a product gas outward conveying pipe 3, inputting the product gas into a final rising pipe 6 through the product gas outward conveying pipe 3, and discharging, wherein the gas pressure in the step is more than 0.02 MPag;
s2, pressure equalizing and reducing: closing the valve opened in the step of pressure swing adsorption, opening a second program control valve 9 on a pipeline connecting one pressure equalizing pipe 8 and the product gas output pipe 3, a second program control valve 9 on a pipeline connecting the other pressure equalizing pipe 8 and the other product gas output pipe 3, and a pressure regulating valve 10 installed on a pipeline connecting the two pressure equalizing pipes 8, wherein the gas in the adsorption tower 2 after pressure swing adsorption sequentially passes through the product gas output pipe 3 connected with the pressure equalizing pipe 8 and the other product gas output pipe 3, and is finally input into the other adsorption tower 2, so that the gas pressures in the two adsorption towers 2 are equal, the pressure regulating valve 10 is controlled by software, a full-automatic regulation mode is adopted, the SP given value is automatically calculated by the software to generate a uniform pressure equalizing and reducing curve, and then the opening PV value of the regulating valve is controlled by operation, so that the pressure equalizing and reducing adsorption tower completes an accurate pressure reducing process completely according to the pressure reducing curve, the voltage-equalizing and pressure-reducing curve is calculated as follows:
SP(t)＝Pare all high-(PAre all high+PAre all low)/2*t/TAre all made of
Wherein, SP(t)For the value of the gas pressure calculated by the program,
Pare all highThe adsorption tower 2 for outputting pressure gas has a detection value at the moment of starting pressure equalization and pressure reduction,
Pare all lowThe detection value of the adsorption tower 2 for inputting pressure gas at the moment of starting pressure equalizing and reducing is obtained,
t is the finished pressure equalizing and reducing time variable,
Tare all made ofThe pressure equalizing and reducing time is set;
s3, placing in sequence: closing the valve opened in the pressure-equalizing and pressure-reducing step, inputting the gas in the adsorption tower 2 after pressure-equalizing and pressure-reducing through the product gas output pipe 3, the pressure-equalizing pipe 8 connected with the product gas output pipe 3 through a pipeline and connected with the forward-discharging pipe 11, the forward-discharging pipe 11 and the input into the forward-discharging buffer tank 12 for storage, wherein at the moment, the second program control valve 9 on the pipeline connecting the pressure-equalizing pipe 8 with the product gas output pipe 3, the first flushing regulating valve 14 and the forward-discharging common valve 15 are in an opening state, the first flushing regulating valve 14 is controlled by software and adopts a full-automatic regulating mode, the SP set value of the first flushing regulating valve is automatically calculated by the software to generate a forward-discharging pressure-reducing curve, and then the opening PV value of the regulating valve is controlled by operation, so that the pressure of the adsorption tower 2 finally discharged in the forward direction completely completes an accurate forward-discharging:
SP(t)＝Pheight of-(PHeight of-PIs low in)*t/TCis-trans
Wherein, SP(t)For the value of the gas pressure calculated by the program,
Pheight ofThe detection value of the adsorption tower 2 for outputting the pressure gas at the moment of the start of the smooth release,
Pis low inThe forward bleed end pressure value determined for the process,
t is the completed progressive time variable,
Tcis-transThe time is the forward release time;
s4, reverse playing: closing the valve opened in the forward discharging step, opening a first program control valve 7 arranged on a connecting pipeline between the reverse discharging pressure reducing pipe 5 and the adsorption tower 2 after forward discharging, and discharging the gas in the adsorption tower 2 into a post-system for continuous treatment through the reverse discharging pressure reducing pipe 5;
s5, washing: closing the valve opened in the reverse discharging step, inputting the gas remained in the forward discharging buffer tank 12 into the adsorption tower 2 after reverse discharging through the flushing inlet pipe 13 and the product gas outward conveying pipe 3 in sequence, inputting the gas into the flushing pipe 4 from the adsorption tower 2, and discharging the gas into the rear system for continuous treatment through the flushing pipe 4, at the moment, the third program control valve 17, the second flushing regulating valve 16, the flushing pipe 4 and the first program control valve 7 on the connecting pipeline of the adsorption tower 2 on the connecting pipeline of the product gas outward conveying pipe 3 and the flushing inlet pipe 13 are all in an open state, the second flushing regulating valve 16 is controlled by software, it adopts a full-automatic regulation mode, the SP given value is automatically calculated by software to generate a uniform flushing depressurization curve, then, the opening PV value of the regulating valve is controlled through calculation, so that the final washing and pressure reduction pressure completely completes the accurate washing process according to the pressure reduction curve, and the calculation method of the washing curve is as follows:
SP(t)＝Pis high and low-(PIs high and low-PDash low)*t/TPunching machine
Wherein, SP(t)For the value of the gas pressure calculated by the program,
Pis high and lowIn order to measure the value of the forward degassing buffer tank 12 at the moment of the start of flushing,
Pdash lowTo flush the minimum pressure value at the process defined forward degassing buffer tank 12,
t is a variable of the time that the rinsing has been completed,
Tpunching machineTotal rinse time;
s6, voltage equalizing and boosting: closing the valve opened in the flushing step, inputting the gas in the adsorption tower 2 receiving the high-pressure gas in the step S2 into the adsorption tower 2 after flushing through the product gas outward transmission pipe 3 connected with the adsorption tower 2, the two pressure equalizing pipes 8 and the product gas outward transmission pipe 3 connected with the adsorption tower 2 after flushing in sequence, so that the gas pressures in the two adsorption towers 2 are equal, and at the moment, connecting the product gas outward transmission pipe 3 of the adsorption tower 2 after flushing with the second program control valve 9 on the connecting pipeline of one pressure equalizing pipe 8, connecting the product gas outward transmission pipe 3 of the adsorption tower 2 receiving the high-pressure gas with the second program control valve 9 on the connecting pipeline of the other pressure equalizing pipe 8, and connecting the pressure regulating valve 10 on the connecting pipeline of the two pressure equalizing pipes 8 are in an open state, wherein the number of the steps is at least one;
s7, final liter: and closing the valve opened in the pressure equalizing and boosting step, enabling the product gas to sequentially flow into the adsorption tower 2 after pressure equalizing and boosting through the final lifting pipe 6, the pressure equalizing pipe 8 and the product gas outward conveying pipe 3, adjusting the adsorption tower 2, and adjusting the gas pressure of the adsorption tower, wherein at the moment, the final lifting adjusting valve 18, the pressure equalizing pipe 8 connected with the final lifting adjusting valve 18 and the second program control valve 9 on the connecting pipeline of the product gas outward conveying pipe 3 are in an open state.
Example 1
As shown in fig. 1, the system for accurately controlling the pressure swing adsorption, pressure equalization, sequential release and flushing processes comprises a raw material gas conveying pipe 1, an adsorption tower 2, a product gas outer conveying pipe 3, a flushing pipe 4, a reverse release depressurization pipe 5, a final rise pipe 6, a first program control valve 7, a pressure transmitter, a pressure equalization mechanism, a flushing mechanism and the like.
The raw material gas conveying pipe 1 is used for inputting raw material gas and is connected with a bottom pipeline of each adsorption tower 2.
The adsorption tower 2 is used for adsorbing and is used for treating the feed gas, the number of the adsorption towers is at least 4, and the treatment efficiency is improved.
And a product gas outward conveying pipe 3 is connected to the top of the adsorption tower 2 and is used for conveying the product gas after the adsorption is finished into a final lifting pipe 6.
The flushing pipe 4 is used for outputting the gas for flushing the adsorption towers 2 to a post-system for subsequent treatment, and is connected with a pipeline at the bottom of each adsorption tower 2.
The reverse-discharge depressurization pipe 5 is used for outputting reverse-discharge gas to a rear system for subsequent treatment, and is connected with a pipeline at the bottom of each adsorption tower 2.
The final rising pipe 6 is connected with each product gas outward transmission pipe 3 through a pipeline, is used for outputting and retaining the product gas, and is connected with the pressure equalizing mechanism through a pipeline, and is used for carrying out final rising treatment on the adsorption tower 2.
The first program control valves 7 are respectively arranged on the feed gas conveying pipe 1 and the connecting pipeline at the bottom of each adsorption tower 2, the flushing pipe 4 and the connecting pipeline at the bottom of each adsorption tower 2, the reverse pressure reducing pipe 5 and the connecting pipeline at the bottom of each adsorption tower 2 and the product gas outward conveying pipe 3 and are used for controlling the connection and disconnection of each pipeline.
The pressure transmitters are arranged on each adsorption tower 2 and the flushing mechanism respectively and used for controlling the gas pressure and avoiding the valve from being damaged due to overlarge gas pressure.
The pressure equalizing mechanism is used for carrying out pressure equalizing and boosting and pressure equalizing and reducing treatment on the adsorption tower 2 and comprises a pressure equalizing pipe 8, a second program control valve 9 and a pressure regulating valve 10. Wherein, the number of the pressure equalizing pipes 8 is at least 2, the pressure equalizing pipes are used for inputting high-pressure gas in one adsorption tower 2 into another low-pressure adsorption tower 2 to equalize the air pressure of the two adsorption towers 2, and each pressure equalizing pipe 8 is respectively connected with each product gas outward transmission pipe 3 by pipelines so as to be convenient for gas transmission; a plurality of second program control valves 9 are arranged on a connecting pipeline of the pressure equalizing pipe 8 and the product gas outward conveying pipe 3 and used for controlling the on-off of the gas circuit; the pressure regulating valve 10 is installed on the connecting pipeline of two adjacent pressure equalizing pipes 8 and used for regulating the pressure, the opening degree of the pressure regulating valve is controlled by the software, the accurate control of the opening degree of the valve can be realized, the pressure of the adsorption tower is ensured to be changed completely according to a pressure change curve, and the accurate pressure change is completed.
The flushing mechanism is used for carrying out sequential release and flushing steps on the adsorption tower 2 and comprises a sequential release pipe 11, a sequential release buffer tank 12, a flushing inlet pipe 13, a first flushing regulating valve 14, a sequential release common valve 15, a second flushing regulating valve 16 and a third program control valve 17. The in-line gas release pipe 11 is connected with a pressure equalizing pipe 8, and is used for inputting gas in the adsorption tower 2 into the in-line gas release pipe 11 through the pressure equalizing pipe 8 and finally into an in-line gas release buffer tank 12; the forward gas release buffer tank 12 is used for receiving forward gas, playing a role of buffering, collecting the gas, and facilitating subsequent better washing of the adsorption tower 2, and a pressure transmitter is installed at a gas outlet of the forward gas release buffer tank, so that washing pressure can be adjusted conveniently; two ends of a flushing inlet pipe 13 are respectively connected with the gas outlet of the forward gas discharge buffer tank 12 and each product gas outward conveying pipe 3 through pipelines and are used for conveying gas into the product gas outward conveying pipes 3 so as to flush the adsorption tower 2; the first flushing regulating valve 14 is arranged on the in-line gas release buffer tank 11 and is used for regulating gas pressure, the opening degree of the first flushing regulating valve is controlled by software, the accurate control of the opening degree of the valve can be realized, the pressure entering the in-line gas release buffer tank 12 is ensured to be changed completely according to a pressure change curve, and accurate pressure change is completed; the sequencing common valve 15 is arranged on the sequencing tube 11 and used for controlling the opening and closing of the sequencing tube 11; the second flushing regulating valve 16 is arranged on the flushing inlet pipe 13 and is used for regulating the gas pressure, the opening degree of the second flushing regulating valve is controlled by the software, the accurate control of the valve opening degree can be realized, the pressure of the product gas output pipe 3 is ensured to be changed completely according to a pressure change curve, and the accurate pressure change is completed; the third program control valves 17 are respectively installed on the connection pipelines of the flushing inlet pipe 13 and each product gas outward transmission pipe 3 and used for controlling the on-off of the flushing gas circuit.
And the final lift regulating valve 18 is arranged on a connecting pipeline of the final lift pipe 6 and one pressure equalizing pipe 8 and is used for performing final lift on the adsorption tower 2.
Example 2
As shown in FIG. 1, the system for precisely controlling the pressure swing adsorption, pressure equalization, sequential discharge and flushing process comprises 4 pressure equalization pipes and 6 adsorption towers, and the use method comprises the following steps:
table 1 shows the working timing of pressure swing adsorption in the washing process of 6 adsorption towers.
TABLE 1 working timing chart of pressure swing adsorption of adsorption tower flushing process
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Tower A | A | A | E1D | E2D | E3D | PP/D | P | P | E3R | E2R | E1R | FR |
| Tower B | E1R | FR | A | A | E1D | E2D | E3D | PP/D | P | P | E3R | E2R |
| Tower C | E3R | E2R | E1R | FR | A | A | E1D | E2D | E3D | PP/D | P | P |
| Tower D | P | P | E3R | E2R | E1R | FR | A | A | E1D | E2D | E3D | PP/D |
| Tower E | E3D | PP/D | P | P | E3R | E2R | E1R | FR | A | A | E1D | E2D |
| Column F | E1D | E2D | E3D | PP/D | P | P | E3R | E2R | E1R | FR | A | A |
Each adsorption tower adsorption cycle period sequentially passes through a pressure swing adsorption process A, a pressure equalizing and reducing process E1D, a pressure equalizing and reducing process E2D, a pressure equalizing and reducing process three E3D, a sequential discharge process PP, a reverse discharge process D, a flushing process P, a pressure equalizing and increasing process three E3R, a pressure equalizing and increasing process two E2R, a pressure equalizing and increasing process one E1R and a final pressure increasing process FR.
The operation sequence of 6 adsorption towers takes the adsorption tower A19 as an example (similar to the adsorption towers B-F), the adsorption tower A19 runs 12 steps in one cycle, and the other steps except the adsorption step can be regarded as different stages of the regeneration step.
The operation of each process sequence of the system will now be described by taking the adsorption column a19 shown in table 1 as an example:
(1) pressure swing adsorption (A)
Opening a first program control valve 7 arranged on a connecting pipeline of a raw gas conveying pipe 1 and an adsorption tower A19 to be adsorbed, and a first program control valve 7 arranged on a connecting pipeline of a product gas outward conveying pipe 3 and an adsorption tower A19, inputting the raw gas from the bottom of an adsorption tower A19 upwards through the raw gas conveying pipe 1, outputting the product gas from the top of the adsorption tower A19, flowing into the product gas outward conveying pipe 3, inputting the product gas into a final rising pipe 6 through the product gas outward conveying pipe 3, and discharging the product gas, wherein the gas pressure in the step is more than 0.02 MPag;
(2) pressure equalizing and reducing (E1D)
Closing the valve opened in the pressure swing adsorption step, opening a second program control valve 9 on a pipeline connecting the first pressure equalizing pipe 25 and the product gas external transmission pipe 3, a second program control valve 9 on a pipeline connecting the second pressure equalizing pipe 27 and the product gas external transmission pipe 3 connected with the adsorption tower C21, and a pressure regulating valve 10 installed on a pipeline connecting the first pressure equalizing pipe 25 and the second pressure equalizing pipe 27, wherein the gas in the adsorption tower A19 is sequentially input into the adsorption tower C21 through the product gas external transmission pipe 3, the first pressure equalizing pipe 25, the second pressure equalizing pipe 27 and the product gas external transmission pipe 3 connected with the adsorption tower C21, so that the gas pressure in the adsorption tower A19 is equal to that in the adsorption tower C21, and after pressure reduction is finished, closing the second program control valve 9 on the pipeline connecting the first pressure equalizing pipe 25 and the product gas external transmission pipe 3, closing the second pressure equalizing pipe 27 and the second program control valve 9 on the pipeline connecting the first pressure equalizing pipe 25 and the product gas external transmission pipe 3 connected with the adsorption tower C21, And the pressure regulating valve 10 is arranged on a connecting pipeline of the first pressure equalizing pipe 25 and the second pressure equalizing pipe 27.
(3) Two voltage equalizing and pressure reducing (E2D)
Opening a second program control valve 9 on a connecting pipeline of the second pressure equalizing pipe 27 and the product gas external transmission pipe 3, opening a second program control valve 9 on a connecting pipeline of the third pressure equalizing pipe 28 and the product gas external transmission pipe 3 connected with the adsorption tower D22, opening a pressure regulating valve 10 arranged on a connecting pipeline of the second pressure equalizing pipe 27 and the third pressure equalizing pipe 28, enabling the gas in the adsorption tower A19 to sequentially pass through the product gas external transmission pipe 3, the second pressure equalizing pipe 27, the third pressure equalizing pipe 28 and the product gas external transmission pipe 3 connected with the adsorption tower D22, and finally inputting the gas into the adsorption tower D22, so that the air pressures in the adsorption tower A19 and the adsorption tower D22 are equal, the two pressure equalizing and pressure reducing are finished, the second program control valve 9 on the connecting pipeline of the second pressure equalizing pipe 27 and the product gas outward transmission pipe 3, the second program control valve 9 on the connecting pipeline of the third pressure equalizing pipe 28 and the product gas outward transmission pipe 3 connected with the adsorption tower D22, and the pressure regulating valve 10 installed on the connecting pipeline of the second pressure equalizing pipe 27 and the third pressure equalizing pipe 28 are closed.
(4) Three pressure equalizing and reducing (E3D)
Opening a second program control valve 9 on a connecting pipeline of the third pressure equalizing pipe 28 and the product gas external transmission pipe 3, opening a second program control valve 9 on a connecting pipeline of the fourth pressure equalizing pipe 25 and the product gas external transmission pipe 3 connected with the adsorption tower E23, opening a pressure regulating valve 10 arranged on a connecting pipeline of the third pressure equalizing pipe 28 and the fourth pressure equalizing pipe 25, enabling the gas in the adsorption tower A19 to sequentially pass through the product gas external transmission pipe 3, the third pressure equalizing pipe 28, the fourth pressure equalizing pipe 25 and the product gas external transmission pipe 3 connected with the adsorption tower E23, and finally inputting the gas into the adsorption tower E23, when the air pressures in the adsorption tower A19 and the adsorption tower E23 are equal, the third pressure equalizing and reducing is finished, the second program control valve 9 on the connecting pipeline of the third pressure equalizing pipe 28 and the product gas outward transmission pipe 3, the second program control valve 9 on the connecting pipeline of the fourth pressure equalizing pipe 25 and the product gas outward transmission pipe 3 connected with the adsorption tower E23 and the pressure regulating valve 10 on the connecting pipeline of the third pressure equalizing pipe 28 and the fourth pressure equalizing pipe 25 are closed.
(5) Cis-trans (PP)
And opening a second program control valve 9, a first flushing regulating valve 14 and a forward public valve 15 on a connecting pipeline of the fourth equalizing pipe 25 and the product gas outward transmission pipe 3, inputting the gas in the adsorption tower A19 into a forward venting buffer tank 12 for storage through the product gas outward transmission pipe 3, the fourth equalizing pipe 25, the forward venting pipe 11, the product gas outward transmission pipe 3 and the forward venting pipe 11, wherein the fourth equalizing pipe 25, the first flushing regulating valve 14 and the forward venting public valve 15 are connected on the connecting pipeline of the fourth equalizing pipe 25 and the product gas outward transmission pipe 3 after input is finished.
(6) Put in the wrong direction (D)
And opening a first program control valve 7 arranged on a connecting pipeline between the reverse pressure reducing pipe 5 and the adsorption tower A19, discharging the gas in the adsorption tower A19 into a rear system through the reverse pressure reducing pipe 5 for continuous treatment, and closing the first program control valve 7 arranged on the connecting pipeline between the reverse pressure reducing pipe 5 and the adsorption tower A19 after the reverse pressure is finished.
(7) Flushing (P)
And opening a third program control valve 17, a second flushing regulating valve 16, a flushing pipe 4 and a first program control valve 7 on a connecting pipeline of the product gas outward conveying pipe 3 and a flushing inlet pipe 13, connecting the first program control valve 7 on a connecting pipeline of the adsorption tower A19 with the flushing pipe 4, inputting the gas left in the forward gas discharge buffer tank 12 into the adsorption tower A19 through the flushing inlet pipe 13 and the product gas outward conveying pipe 3 in sequence, inputting the gas into the flushing pipe 4 from the adsorption tower A19, discharging the gas into a rear system through the flushing pipe 4 for continuous treatment, and closing the third program control valve 17, the second flushing regulating valve 16, the first program control valve 7 on a connecting pipeline of the product gas outward conveying pipe 3 and the flushing inlet pipe 13, connecting pipelines of the flushing pipe 4 and the adsorption tower A19 after flushing is finished.
(8) Three voltage sharing step-up (E3R)
Opening a second program control valve 9 on a connecting pipeline connecting the product gas external transmission pipe 3 of the adsorption tower A19 with the fourth pressure equalizing pipe 25, a second program control valve 9 on a connecting pipeline connecting the product gas external transmission pipe 3 of the adsorption tower C21 with the third pressure equalizing pipe 28, and a pressure regulating valve 10 installed on a connecting pipeline connecting the third pressure equalizing pipe 28 with the fourth pressure equalizing pipe 25, leading the gas in the adsorption tower C21 to sequentially pass through the product gas external transmission pipe 3 connected with the adsorption tower C21, the third pressure equalizing pipe 28, the fourth pressure equalizing pipe 25, the product gas external transmission pipe 3 connected with the adsorption tower A19, and input into the adsorption tower A19, so that the gas pressures in the adsorption tower A19 and the adsorption tower C21 are equal, closing the second program control valve 9 on the connecting pipeline connecting the product gas external transmission pipe 3 connected with the adsorption tower A19 with the fourth pressure equalizing pipe 25, and connecting the product gas external transmission pipe 3 of the adsorption tower C21 with the second program control valve 9 on the connecting pipeline connecting the third pressure equalizing pipe 28, And the pressure regulating valve 10 is installed on a connecting pipeline of the third pressure equalizing pipe 28 and the fourth pressure equalizing pipe 25.
(9) Two voltage sharing step-up (E2R)
Opening a second program control valve 9 on a connecting pipeline connecting the product gas external transmission pipe 3 of the adsorption tower A19 and a third pressure equalizing pipe 28, a second program control valve 9 on a connecting pipeline connecting the product gas external transmission pipe 3 of the adsorption tower D22 and a second pressure equalizing pipe 27, and a pressure regulating valve 10 installed on the connecting pipeline connecting the third pressure equalizing pipe 28 and the second pressure equalizing pipe 27, leading the gas in the adsorption tower D22 to sequentially pass through the product gas external transmission pipe 3 connected with the adsorption tower C21, the second pressure equalizing pipe 27, the third pressure equalizing pipe 28, the product gas external transmission pipe 3 connected with the adsorption tower A19, and input into the adsorption tower A19, so that the gas pressures in the adsorption tower A19 and the adsorption tower D22 are equal, closing the second program control valve 9 on the connecting pipeline connecting the product gas external transmission pipe 3 of the adsorption tower A19 and the third pressure equalizing pipe 28, and connecting the product gas external transmission pipe 3 of the adsorption tower D22 and the second program control valve 9 on the connecting pipeline connecting the product gas external transmission pipe 3 of the adsorption tower D22 and the second pressure equalizing pipe 27, And the pressure regulating valve 10 is arranged on a connecting pipeline of the third pressure equalizing pipe 28 and the second pressure equalizing pipe 27.
(10) One voltage equalizing booster (E1R)
Opening a second program control valve 9 on a connecting pipeline connecting the product gas external transmission pipe 3 of the adsorption tower A19 with a second pressure equalizing pipe 27, connecting the product gas external transmission pipe 3 of the adsorption tower E23 with the first pressure equalizing pipe 26, installing a pressure regulating valve 10 on the connecting pipeline connecting the first pressure equalizing pipe 26 with the second pressure equalizing pipe 27, leading the gas in the adsorption tower E23 to sequentially pass through the product gas external transmission pipe 3 connected with the adsorption tower E23, the first pressure equalizing pipe 26, the second pressure equalizing pipe 27, the product gas external transmission pipe 3 connected with the adsorption tower A19, inputting the gas into the adsorption tower A19, ensuring that the gas pressures in the adsorption tower A19 and the adsorption tower E23 are equal, closing the second program control valve 9 on the connecting pipeline connecting the product gas external transmission pipe 3 connected with the adsorption tower A19 with the second pressure equalizing pipe 27, connecting the product gas external transmission pipe 3 of the adsorption tower E23 with the second program control valve 9 on the connecting pipeline connecting the first pressure equalizing pipe 26, And the pressure regulating valve 10 is arranged on a connecting pipeline of the first pressure equalizing pipe 26 and the second pressure equalizing pipe 27.
(11) Final liter (FR)
And opening a second program control valve 9 on a connecting pipeline of the final-rise regulating valve 18, the first pressure equalizing pipe 26 and the product gas outward transmission pipe 3, enabling the product gas to sequentially pass through the final-rise pipe 6, the first pressure equalizing pipe 26 and the product gas outward transmission pipe 3 and flow into the adsorption tower A19, regulating the adsorption tower 2, regulating the gas pressure of the adsorption tower, and closing the second program control valve 9 on the connecting pipeline of the final-rise regulating valve 18, the first pressure equalizing pipe 26 and the product gas outward transmission pipe 3 after the regulation is completed.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a system for accurate control pressure swing adsorption, pressure-equalizing, in same direction as put and wash process, its characterized in that, including feed gas-supply pipe (1), the bottom with a plurality of adsorption towers (2) that feed gas-supply pipe (1) is connected, with every flushing pipe (4) and contrary pressure pipe (5) of putting that adsorption tower (2) bottom is connected, with product gas defeated outer pipe (3) that adsorption tower (2) top is connected, the pressure equalization mechanism who is connected with every product gas defeated outer pipe (3), the flushing mechanism that one end is connected with pressure equalization mechanism and the other end is connected with every product gas defeated outer pipe (3), rise tube (6) with every product gas defeated outer pipe (3) are connected, install in on the connecting tube of feed gas-supply pipe (1) and every adsorption tower (2) bottom, on the connecting tube of flushing pipe (4) and every adsorption tower (2) bottom, the, The device comprises a first program control valve (7) arranged on a connecting pipeline at the bottom of each adsorption tower (2) and on a product gas outward transmission pipe (3) and a reverse pressure relief pipe (5), and pressure transmitters arranged on each adsorption tower (2) and a flushing mechanism, wherein a final rising pipe (6) is connected with a pressure equalizing mechanism pipeline, and the pressure equalizing mechanism and the flushing mechanism are controlled by software to open.
2. The system for accurately controlling the pressure swing adsorption, pressure equalizing, sequential releasing and flushing processes according to claim 1, wherein the pressure equalizing mechanism comprises a plurality of pressure equalizing pipes (8) which are connected in parallel and are respectively connected with each product gas outgoing pipe (3) through a pipeline, a second program control valve (9) which is arranged on the connecting pipeline of the product gas outgoing pipe (3) and the pressure equalizing pipes (8), and a pressure regulating valve (10) which is connected between two adjacent pressure equalizing pipes (8), wherein the number of the pressure equalizing pipes (8) is at least 2, the flushing mechanism is connected with one of the pressure equalizing pipes (8), the final lifting pipe (6) is connected with one of the pressure equalizing pipes (8), and the opening degree of the pressure regulating valve (10) is controlled through software.
3. A system for accurately controlling PSA, equalizing, cis-bleeding and flushing processes according to claim 2, characterized in that the final-rising regulator valve (18) is installed on the connecting pipe of the final-rising pipe (6) and the equalizing pipe (8).
4. A system for accurately controlling PSA, pressure equalization, snubbing and flushing processes according to claim 3, wherein the flushing mechanism comprises a snubbing pipe (11) connected to a pressure equalization pipe (8), a snubbing tank (12) having an air inlet connected to the snubbing pipe (11), a flushing inlet pipe (13) having one end connected to an air outlet of the snubbing tank (12) and the other end connected to each product gas export pipe (3), a first flush regulating valve (14) and a snubbing common valve (15) sequentially installed on the snubbing pipe (11), a second flush regulating valve (16) installed on the flush inlet pipe (13), and a third program control valve (17) installed on a connecting line of the flush inlet pipe (13) and each product gas export pipe (3), wherein the pressure transmitter is installed on the air outlet of the snubbing tank (12), the opening degree of the first flushing regulating valve (14) and the second flushing regulating valve (16) is controlled by software.
5. A system for precise control of pressure swing adsorption, equalization, snubbing and flushing processes according to claim 1, characterized in that the number of adsorption towers (2) is at least 4.
6. The method of using a system for accurately controlling a pressure swing adsorption, equalization, cis-bleeding and flushing process of claim 1, comprising the steps of:
s1, pressure swing adsorption: the raw material gas is input from the bottom of the adsorption tower (2) to the top through the raw material gas transmission pipe (1), and the product gas is output from the top of the adsorption tower (2), flows into the product gas outer transmission pipe (3), is input into the final rising pipe (6) through the product gas outer transmission pipe (3) and is discharged;
s2, pressure equalizing and reducing: inputting high-pressure gas into the other adsorption tower (2) through a pressure equalizing mechanism by the adsorption tower (2) after pressure swing adsorption to balance the gas pressure of the two towers;
s3, placing in sequence: the gas in the adsorption tower (2) after pressure equalization and depressurization is input into the flushing mechanism through a product gas outer conveying pipe (3) and a pressure equalization mechanism in sequence;
s4, reverse playing: discharging the gas in the adsorption tower (2) after being sequentially discharged through a reverse discharging depressurization pipe (5);
s5, washing: gas in the flushing mechanism sequentially passes through the product gas outward conveying pipe (3) and the reversely placed adsorption tower (2), is conveyed into the flushing pipe (4), and is discharged through the flushing pipe (4);
s6, voltage equalizing and boosting: inputting the gas in the adsorption tower (2) receiving the high-pressure gas in the step S2 into the adsorption tower (2) after washing through a pressure equalizing mechanism, and equalizing the gas pressure of the two towers;
s7, final liter: the product gas is input into the adsorption tower (2) after pressure equalizing and boosting sequentially through a final rising pipe (6), a pressure equalizing mechanism and a product gas outward conveying pipe (3), and the gas pressure in the adsorption tower (2) after pressure equalizing and boosting is adjusted.
7. The system for precise control of PSA, pressure equalization, cis-bleeding and flushing processes according to claim 6, wherein the PSA pressure of step S1 is greater than 0.02 MPag.
8. The system for accurately controlling PSA, pressure equalization, cis-bleeding and flushing processes of claim 6, wherein the pressure equalization de-pressurization of step S2 and the pressure equalization up-pressurization of step S6 are each performed at least once.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011146575.6A CN112316664A (en) | 2020-10-23 | 2020-10-23 | System for accurately controlling pressure swing adsorption, pressure equalization, sequential discharge and flushing processes and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011146575.6A CN112316664A (en) | 2020-10-23 | 2020-10-23 | System for accurately controlling pressure swing adsorption, pressure equalization, sequential discharge and flushing processes and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112919414A (en) * | 2021-03-15 | 2021-06-08 | 西南化工研究设计院有限公司 | Low-pressure flushing regeneration pressure swing adsorption hydrogen purification system and hydrogen purification method |
| CN113041782A (en) * | 2021-03-15 | 2021-06-29 | 西南化工研究设计院有限公司 | Gas pressure swing adsorption separation and purification system and separation and purification method thereof |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112919414A (en) * | 2021-03-15 | 2021-06-08 | 西南化工研究设计院有限公司 | Low-pressure flushing regeneration pressure swing adsorption hydrogen purification system and hydrogen purification method |
| CN113041782A (en) * | 2021-03-15 | 2021-06-29 | 西南化工研究设计院有限公司 | Gas pressure swing adsorption separation and purification system and separation and purification method thereof |
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