CN209752530U - Device for adsorbing and separating gas - Google Patents
Device for adsorbing and separating gas Download PDFInfo
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- CN209752530U CN209752530U CN201920415426.1U CN201920415426U CN209752530U CN 209752530 U CN209752530 U CN 209752530U CN 201920415426 U CN201920415426 U CN 201920415426U CN 209752530 U CN209752530 U CN 209752530U
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Abstract
the application provides a device for adsorbing and separating gas, belonging to the technical field of gas treatment. The device for adsorbing and separating gas comprises a raw gas treatment unit and a gas storage device. The raw material gas treatment unit is provided with an input port, an output port and an air release port, each adsorption tower in the raw material gas treatment unit is provided with an air inlet and an air outlet, the air inlets are communicated with the input port, and the output ports are communicated with the air outlets. Each adsorption tower has an adsorption state, a depressurization state, a desorption state, and a pressure-increasing state. When the adsorption tower is in a pressure reduction state, the adsorption tower is communicated with the gas storage device, so that gas in the adsorption tower enters the gas storage device, and the pressure of the adsorption tower is reduced. When the adsorption tower is in a pressure boosting state, the adsorption tower is communicated with the gas storage device, so that gas in the gas storage device enters the adsorption tower, and the pressure of the adsorption tower is boosted. The effective gas entering the gas storage device in the pressure reduction process of the adsorption tower finally returns to the adsorption tower again for pressure boosting, so that the recovery rate of the effective gas is improved.
Description
Technical Field
The application relates to the technical field of gas treatment, in particular to a device for adsorbing and separating gas.
Background
In the process of performing adsorption treatment on a raw material gas (such as natural gas, synthesis gas, and the like) by using a raw material gas treatment device to obtain a product gas, an adsorption tower in the raw material gas treatment device is used to adsorb impurity gas (such as carbon dioxide) in the raw material gas, and after an adsorbent in the adsorption tower is saturated by adsorption, the adsorption tower needs to be regenerated to enable the adsorption tower to have re-adsorption capacity. At present, the gas in the adsorption tower is generally pumped out to reduce the pressure in the adsorption tower, so that the adsorbent in the adsorption tower desorbs the impurity gas, the impurity gas is discharged, and finally the product gas is injected into the adsorption tower to make the pressure in the adsorption tower reach the pressure capable of being adsorbed again. In the whole process, the gas pumped out from the adsorption tower is wasted, so that the waste of effective gas is caused, and the recovery rate of the effective gas is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a device for adsorbing and separating gas to improve the problem that the effective gas recovery rate is low in the prior art.
the embodiment of the application provides a device for adsorbing and separating gas, which comprises a raw gas treatment unit and a gas storage device;
The raw material gas treatment unit is provided with an input port, an output port and an air release port, the raw material gas treatment unit comprises at least two adsorption towers which are arranged in parallel, each adsorption tower is provided with an air inlet and an air outlet, the air inlet is connected with the input port, and the output port is connected with the air outlet;
Each adsorption tower is connected with the gas storage device, and the gas storage device comprises at least three gas storage tanks which are arranged in parallel;
each adsorption tower has an adsorption state, a depressurization state, a desorption state and a pressurization state, and at least one adsorption tower in the raw material gas treatment unit is in the adsorption state;
when the adsorption tower is in an adsorption state, the adsorption tower is disconnected from a gas storage device, and the adsorption tower is configured to adsorb impurity gas in the feed gas entering from the input port to obtain product gas discharged from the output port;
when the adsorption tower is in a depressurization state, the adsorption tower is communicated with the gas storage device, so that gas in the adsorption tower enters the at least three gas storage tanks to depressurize the adsorption tower;
when the adsorption tower is in a desorption state, the adsorption tower is disconnected with the gas storage device, so that the impurity gas desorbed from the adsorption tower after pressure reduction is discharged from the gas release port;
When the adsorption tower is in a pressure boosting state, the adsorption tower is communicated with the gas storage device, so that gas in the at least three gas storage tanks enters the adsorption tower, and the pressure of the adsorption tower is boosted.
In the above technical scheme, each adsorption tower has an adsorption state, a depressurization state, a desorption state and a pressurization state. When the adsorption tower is in an adsorption state, the adsorbent in the adsorption tower can adsorb impurity gas in the feed gas to obtain product gas. When the whole device works, at least one adsorption tower is used for treating the raw material gas so as to ensure the continuous output of the product gas. When the adsorbent in the adsorption tower is adsorbed and saturated, the adsorption tower enters a pressure reduction state, a desorption state and a pressure increase state in sequence, so that the adsorption tower has reabsorption capacity. When the adsorption tower in the raw gas treatment unit is in a pressure reduction state, gas in the adsorption tower enters each gas storage tank of the gas storage device, so that the adsorption tower is subjected to pressure reduction, preparation is made for the adsorption tower to enter a desorption state, and the gas entering the gas storage device is stored for later use; when the adsorption tower far away from the gas processing unit is in a pressure boosting state, gas stored in each gas storage tank of the gas storage device enters the adsorption tower, so that the pressure of the adsorption tower is boosted, and the adsorption tower has re-adsorption capacity. That is to say, the effective gas that enters into gas storage device among the adsorption tower depressurization process will finally get back to the adsorption tower again and boost pressure, has reduced effective gaseous waste, has improved the rate of recovery to effective gas.
in addition, the device for the adsorptive separation of gas according to the embodiment of the first aspect of the present application has the following additional technical features:
In some embodiments of the first aspect of the present application, when the adsorption tower is in the depressurization state, the respective gas tanks are communicated with the adsorption tower one by one in order of high internal pressure to low internal pressure, so that the pressure in the respective gas tanks is increased step by step;
When the adsorption tower is in a boosting state, each gas storage tank is communicated with the adsorption tower one by one according to the sequence of internal pressure from low to high, so that the pressure in each gas storage tank is reduced step by step.
among the above-mentioned technical scheme, when the adsorption tower was in the decompression state, each gas holder communicates with the adsorption tower one by one to make the pressure in the adsorption tower enough low, when the adsorption tower was in the state of stepping up, each gas holder communicated with the adsorption tower one by one according to the order that internal pressure was from low to high, thereby made the pressure in the adsorption tower as high as possible.
in some embodiments of the first aspect of the present application, the gas storage device and the raw gas treatment unit are connected by a first connection pipe and a second connection pipe;
the at least three gas storage tanks are connected in parallel between the first connecting pipe and the second connecting pipe, and each gas storage tank is provided with an inlet and an outlet;
A first switching device is arranged between the inlet and the first connecting pipe and is configured to connect or disconnect the inlet and the first connecting pipe;
A second switch device is arranged between the outlet and the second connecting pipe and is configured to connect or disconnect the outlet and the second connecting pipe;
A third switching device is disposed between the air inlet and the first connection pipe, and the third switching device is configured to connect or disconnect the air inlet and the first connection pipe;
a fourth switching device is arranged between the air outlet and the second connecting pipe, and the fourth switching device is configured to connect or disconnect the air outlet and the second connecting pipe.
In the technical scheme, the connection or disconnection of the adsorption tower and each gas storage tank in the gas storage device can be realized by controlling the first switch device, the second switch device, the third switch device and the fourth switch device.
in some embodiments of the first aspect of the present application, the purge port is connected to the gas inlet, and the impurity gas desorbed from the adsorption column after the pressure reduction is discharged from the purge port through the gas inlet when the adsorption column is in the desorption state; or
and the gas release port is connected with the gas outlet, and when the adsorption tower is in a desorption state, the impurity gas desorbed from the adsorption tower after pressure reduction is discharged from the gas release port through the gas outlet.
In the technical scheme, the air release port is connected with the air inlet of the adsorption tower, namely when the adsorption tower is in a desorption state, the impurity gas desorbed from the adsorption tower after pressure reduction is discharged from the air release port through the air inlet, namely the impurity gas is reversely discharged from the adsorption tower; the air release port is connected with the air outlet of the adsorption tower, namely when the adsorption tower is in a desorption state, the impurity gas desorbed from the adsorption tower after pressure reduction is discharged from the air release port through the air outlet, namely the impurity gas is discharged out of the adsorption tower along the way.
in some embodiments of the first aspect of the present application, a fifth switching device is disposed between the input port and the intake port, the fifth switching device being configured to connect or disconnect the input port to the intake port;
And a sixth switching device is arranged between the output port and the air outlet and is configured to connect or disconnect the output port and the air outlet.
In the technical scheme, a fifth switching device is arranged between the input port and the air inlet, namely, the input port and the air inlet can be connected or disconnected through the fifth switching device; and a sixth switching device is arranged between the output port and the air outlet, namely the input port and the air outlet can be connected or disconnected through the sixth switching device. When the adsorption tower is in an adsorption state, a fifth switching device and a sixth switching device corresponding to the adsorption tower can be opened, so that raw gas can enter the adsorption tower from an input port, and product gas can be discharged from an output port; when the adsorption tower is in other states, the fifth switching device and the sixth switching device corresponding to the adsorption tower can be closed.
In some embodiments of the first aspect of the present application, the feed gas treatment unit further has a pumping port connected to the gas inlet or the gas outlet;
The adsorption tower is also provided with a regeneration state, and when the adsorption tower is in the regeneration state, the gas in the adsorption tower is extracted through the extraction opening, so that the residual impurity gas in the adsorption tower after desorption can be discharged from the extraction opening.
In the technical scheme, when the adsorption tower is in a regeneration state, the gas in the adsorption tower can be extracted through the extraction opening by using the air extractor so as to discharge the residual impurity gas in the desorbed adsorption tower from the extraction opening, thereby improving the reabsorption capacity of the adsorbent in the adsorption tower.
In some embodiments of the first aspect of the present application, a seventh switching device is provided between the suction port and the intake port, the seventh switching device being configured to connect or disconnect the suction port with or from the intake port; or
A seventh switching device is arranged between the air pumping opening and the air outlet and is configured to connect or disconnect the air pumping opening and the air outlet.
In the technical scheme, when the adsorption tower is in a regeneration state, the seventh switching device corresponding to the adsorption tower can be opened, so that the residual impurity gas in the adsorption tower can be extracted from the extraction opening; when the adsorption tower is in other states, the seventh switching device corresponding to the adsorption tower can be closed.
in some embodiments of the first aspect of the present application, the feed gas treatment unit further has a flush inlet and a flush outlet, the flush inlet being connected to the gas outlet, the flush outlet being connected to the gas inlet;
The adsorption tower is also provided with a regeneration state, when the adsorption tower is in the regeneration state, the adsorption tower is disconnected with the gas storage device, and flushing gas enters the adsorption tower from the flushing inlet and is discharged from the flushing outlet so as to discharge residual impurity gas in the desorbed adsorption tower from the flushing outlet.
Among the above-mentioned technical scheme, when the adsorption tower was in regeneration state, the purge gas got into the adsorption tower from washing the import and discharged from washing the export, and the purge gas can be followed the discharge with remaining impurity gas in the adsorption tower after the desorption in the flow process to improve the adsorption tower in the adsorbant ability of reabsorbing.
In some embodiments of the first aspect of the present application, an eighth switching device is provided between the flushing inlet and the air outlet, the eighth switching device being configured to connect or disconnect the flushing inlet with the air outlet;
a ninth switching device is arranged between the flushing outlet and the air inlet and is configured to connect or disconnect the flushing outlet and the air inlet.
In the above technical solution, the eighth switching device between the flushing inlet and the air outlet can connect or disconnect the flushing inlet and the air outlet through the eighth switching device; and a ninth switching device is arranged between the flushing outlet and the air inlet, namely the flushing inlet and the air inlet can be connected or disconnected through the ninth switching device. When the adsorption tower is in a regeneration state, the eighth switching device and the ninth switching device corresponding to the adsorption tower can be opened, so that flushing gas can enter the adsorption tower from the flushing inlet and be discharged from the flushing outlet; when the adsorption tower is in other states, the eighth switching device and the ninth switching device corresponding to the adsorption tower can be closed.
In some embodiments of the first aspect of the present application, the feed gas treatment unit further has a pressure boost port connected to the gas inlet or the gas outlet;
The adsorption tower is also provided with a final pressure-rising state, when the adsorption tower is in the final pressure-rising state, the adsorption tower is disconnected from the gas storage device, and the pressure-rising gas enters the adsorption tower after pressure-rising from the pressure-rising port.
In the technical scheme, when the adsorption tower is in a pressure-increasing state, after gas in the gas storage device enters the adsorption tower, the pressure in the adsorption tower may be lower than the pressure before the pressure reduction of the adsorption tower. And the adsorption tower also has a final pressure-rising state, and when the adsorption tower is in the final pressure-rising state, the pressure-rising gas enters the adsorption tower after pressure-rising from the pressure-rising port, so that the pressure in the adsorption tower reaches the pressure before pressure-lowering, and the adsorption capacity of the adsorption tower is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic diagram of a first possible structure of an apparatus for adsorptive separation of gas according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a second possible structure of an apparatus for adsorptive separation of gas according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a third possible structure of an apparatus for adsorptive separation of gas according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a fourth possible structure of an apparatus for adsorptive separation of gas according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a fifth possible structure of an apparatus for adsorptive separation of gas according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a sixth possible structure of an apparatus for adsorptive separation of gas according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a seventh possible structure of an apparatus for adsorptive separation of gas according to an embodiment of the present application;
FIG. 8 is a schematic diagram of an eighth possible structure of an apparatus for adsorptive separation of gas according to an embodiment of the present application;
FIG. 9 is a first possible flow diagram of a method for adsorptive separation of gases according to embodiments of the present application;
FIG. 10 is a second possible flow diagram of a method for adsorptive separation of gases provided in embodiments of the present application;
Fig. 11 is a third possible flow chart of a method for adsorptive separation of gas according to the embodiments of the present application.
icon: 100-a means for adsorptive separation of gases; 10-raw gas treatment unit; 11-an input port; 12-an output port; 13-air release port; 14-an adsorption column; 141-an air inlet; 142-an air outlet; 15-an air extraction opening; 16-a flush inlet; 17-a flush outlet; 18-a boost port; 20-gas storage means; 21-an air storage tank; 211-inlet; 212-an outlet; 22-a first connection pipe; 23-a second connecting tube; 30-a first switching device; 31-a second switching device; 32-a third switching device; 33-fourth switching means; 34-a fifth switching device; 35-sixth switching means; 36-seventh switching means; 37-eighth switching means; 38-ninth switching device.
Detailed Description
in order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.
it should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
it should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is usually understood by those skilled in the art, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Examples
The embodiment of the application provides a device 100 for adsorbing and separating gas, so that the waste of effective gas is reduced, and the recovery rate of the effective gas is improved.
An apparatus 100 for adsorptive separation of gas according to the present application is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an apparatus 100 for adsorptive separation of gas includes a raw gas treatment unit 10 and a gas storage apparatus 20. The raw material gas treatment unit 10 has an input port 11, an output port 12, and a gas discharge port 13, the raw material gas treatment unit 10 includes at least two adsorption towers 14 arranged in parallel, each adsorption tower 14 has a gas inlet 141 and a gas outlet 142, the gas inlet 141 is connected to the input port 11, and the output port 12 is connected to the gas outlet 142. Each adsorption tower 14 is connected to a gas storage device 20. The gas storage device 20 includes at least three gas storage tanks 21 arranged in parallel. Each adsorption tower 14 has an adsorption state, a depressurization state, a desorption state, and a pressure-increasing state, and at least one adsorption tower 14 in the raw material gas treatment unit 10 is in the adsorption state.
When the adsorption tower 14 is in the adsorption state, the adsorption tower 14 is disconnected from the gas storage device 20, and the adsorption tower 14 is configured to adsorb impurity gas in the raw gas entering from the input port 11 to obtain product gas discharged from the output port 12;
When the adsorption tower 14 is in a depressurization state, the adsorption tower 14 is communicated with the gas storage device 20, so that the gas in the adsorption tower 14 enters each gas storage tank 21 to depressurize the adsorption tower 14;
When the adsorption tower 14 is in a desorption state, the adsorption tower 14 is disconnected from the gas storage device 20, so that the impurity gas desorbed from the adsorption tower 14 after pressure reduction is discharged from the gas release port 13;
when the adsorption tower 14 is in a pressure-increasing state, the adsorption tower 14 communicates with the gas storage device 20, so that the gas in each gas storage tank 21 enters the adsorption tower 14 to increase the pressure of the adsorption tower 14.
When the whole device works, at least one adsorption tower 14 is used for treating the raw gas so as to ensure the continuous output of the product gas. When the adsorbent in the adsorption tower 14 is saturated, the adsorption tower 14 enters a pressure reduction state, a desorption state and a pressure increase state in sequence, so that the adsorption tower 14 has a re-adsorption capacity. When the adsorption tower 14 in the raw gas treatment unit 10 is in a depressurization state, the gas in the adsorption tower 14 enters each gas storage tank 21 of the gas storage device 20, so that the adsorption tower 14 is depressurized, and preparation is made for the adsorption tower 14 to enter a desorption state, and the gas entering the gas storage device 20 is stored for later use; when the adsorption tower 14 in the raw material gas treatment unit is in a pressure-increased state, the gas stored in each gas storage tank 21 of the gas storage device 20 enters the adsorption tower 14 to increase the pressure of the adsorption tower 14, so that the adsorption tower 14 has a re-adsorption capacity. That is to say, the effective gas entering the gas storage device 20 during the depressurization process of the adsorption tower 14 finally returns to the adsorption tower 14 again for pressure increase, so that the waste of the effective gas is reduced, and the recovery rate of the effective gas is improved.
In this embodiment, the raw material gas is natural gas, the product gas is natural gas, and the impurity gas may be carbon dioxide.
The gas storage device 20 is used for storing the gas generated during the pressure reduction process of the adsorption tower 14, and using the stored gas as the gas source during the pressure increase process of the adsorption tower 14.
in some embodiments of the present application, when the adsorption tower 14 is in the depressurized state, the respective gas tanks 21 are communicated with the adsorption tower 14 one by one from the high to the low in the order from the internal pressure, so that the pressure in the respective gas tanks 21 is increased step by step, thereby making the pressure in the adsorption tower 14 sufficiently low.
when the adsorption tower 14 is in a pressure-increasing state, each gas tank 21 is communicated with the adsorption tower 14 one by one according to the sequence of the internal pressure from low to high, so that the pressure in each gas tank is reduced step by step, and the pressure in the adsorption tower 14 is as high as possible.
Further, in the present embodiment, the gas storage device 20 is connected to the raw gas treatment unit 10 through the first connection pipe 22 and the second connection pipe 23. Each air tank 21 is connected in parallel between the first connection pipe 22 and the second connection pipe 23, and each air tank 21 has an inlet 211 and an outlet 212. A first switching device 30 is provided between the inlet 211 of each air tank 21 and the first connection pipe, and the first switching device 30 is configured to connect or disconnect the inlet 211 to or from the first connection pipe. A second switching device 31 is provided between the outlet 212 of each air tank 21 and the second connection pipe 23, and the second switching device 31 is configured to connect or disconnect the outlet 212 to or from the second connection pipe 23. A third switching device 32 is provided between the air inlet port 141 and the first connection pipe 22, and the third switching device 32 is configured to connect or disconnect the air inlet port 141 and the first connection pipe 22. Between air outlet 142 and second connection pipe 23, fourth switching device 33 is provided, and fourth switching device 33 is configured to connect or disconnect air outlet 142 from second connection pipe 23.
the connection or disconnection of the adsorption tower 14 to each of the gas storage tanks 21 in the gas storage means 20 can be achieved by controlling the first switching means 30, the second switching means 31, the third switching means 32, and the fourth switching means 33. For example, when the adsorption tower 14 is in the adsorption state, each of the gas storage tanks 21 in the adsorption tower 14 and the gas storage device 20 needs to be disconnected, and at this time, the third switching device 32 and the fourth switching device 33 corresponding to the adsorption tower 14 in the adsorption state may be turned off; when the adsorption tower 14 is in a depressurization state, each gas storage tank 21 in the gas storage devices 20 needs to be communicated with the adsorption tower 14 one by one, at this time, the fourth switching device 33 corresponding to the adsorption tower 14 needing depressurization can be opened, and the second switching devices 31 corresponding to each gas storage tank 21 can be opened one by one; when the adsorption tower 14 is in the desorption state, each of the gas storage tanks 21 in the adsorption tower 14 and the gas storage devices 20 needs to be disconnected, and at this time, the third switching device 32 and the fourth switching device 33 corresponding to the adsorption tower 14 needing desorption can be closed; when the adsorption tower 14 is in the pressure increasing state, the respective air tanks 21 need to be communicated with the adsorption tower 14 which needs to be pressure increased one by one, and at this time, the third switching devices 32 corresponding to the adsorption tower 14 which needs to be pressure increased may be turned on, and the first switching devices 30 corresponding to the respective air tanks 21 may be turned on one by one.
As an example, with continued reference to fig. 1, the number of the adsorption columns 14 in the raw material gas treatment unit 10 is three, and three adsorption columns 14 are connected in parallel between the input port 11 and the output port 12, that is, the gas inlet 141 of each adsorption column 14 is connected to the input port 11, and the gas outlet 142 of each adsorption column 14 is connected to the output port 12; the gas inlet 141 of each adsorption tower 14 is connected with the first connecting pipe 22 through an input pipeline, and a third switching device 32 is correspondingly arranged on one input pipeline; the gas outlet 142 of each adsorption tower 14 is connected with the second connecting pipe 23 through an output pipeline, and a fourth switching device 33 is correspondingly arranged on one output pipeline. Seven air tanks 21 are arranged in the air storage device 20, and the seven air tanks 21 are connected in parallel between the first connecting pipe 22 and the second connecting pipe 23; the inlet 211 of each gas outlet tank is connected with the first connecting pipe 22 through an inflow pipe, and a first switch device 30 is correspondingly arranged on the inflow pipe; the outlet 212 of each air outlet pipe is connected with the second connecting pipe 23 through an outflow pipe, and a second switch device 31 is correspondingly arranged on one outflow pipe.
If one adsorption tower 14 of the three adsorption towers 14 is saturated and the other two adsorption towers 14 are in the adsorption state, the saturated adsorption tower 14 is in the pressure reduction state, the desorption state and the pressure increase state in order to make the saturated adsorption tower 14 have the regeneration capacity. When the saturated adsorption tower 14 is under reduced pressure, each of the seven gas tanks 21 will be communicated with the adsorption tower 14 one by one. Assuming that the pressure in the adsorption tower 14 is 5 mpa, the pressure in the first gas storage tank 21 is 1 mpa, and the pressure in the first gas storage tank 21 and the pressure in the adsorption tower 14 are equalized after the first gas storage tank 21 and the adsorption tower 14 are communicated, the pressure in the adsorption tower 14 and the pressure in the first gas storage tank 21 are approximately 3 mpa; assuming that the pressure in the second gas holder 21 is 0.8 mpa, the pressure in the second gas holder 21 and the pressure in the adsorption tower 14 are equalized after the second gas holder 21 and the adsorption tower 14 are communicated, and the pressure in the adsorption tower 14 and the pressure in the second gas holder 21 are approximately 1.9 mpa, and so on, the pressure in the pressure equalizing adsorption tower 14 is reduced each time. When the adsorption tower 14 is in a pressure-increasing state, each of the seven gas storage tanks 21 is communicated with the adsorption tower 14 one by one in the order of the internal pressure from low to high, that is, the gas storage tank 21 with the lowest internal pressure equalizes the pressure with the adsorption tower 14, then the gas storage tank 21 with the second lowest internal pressure equalizes the pressure with the adsorption tower 14, and so on.
Of course, the parallel connection of the air containers 21 in the air storage device 20 is not only the case in the above-described embodiment. In other embodiments, each gas storage tank 21 may be connected in parallel, for example, as shown in fig. 2, the gas storage tank 21 is connected with the raw gas treatment unit 10 through the first connection pipe 22. A respective air reservoir 21 is connected in parallel to the first connecting pipe 22, each air reservoir having an inlet 211. A first switching device 30 is provided between the inlet 211 of each air tank 21 and the first connection pipe, and the first switching device 30 is configured to connect or disconnect the inlet 211 to or from the first connection pipe. A second switching device 31 is provided between the gas inlet 141 of each adsorption tower 14 and the first connection pipe 22, and the second switching device 31 is configured to connect or disconnect the gas inlet 141 to or from the first connection pipe 22. When the adsorption tower 14 is in a pressure reduction state, gas in the adsorption tower 14 enters the gas storage tank 21 through the first connecting pipe 22; when the adsorption tower 14 is in a pressure-increasing state, the gas in the gas tank 21 enters the adsorption tower 14 through the first connection pipe 22.
When the adsorption tower 14 is in the desorption state, the impurity gas desorbed from the adsorption tower 14 is finally discharged from the gas release port 13, the pressure inside the adsorption tower 14 is released to the normal pressure (atmospheric pressure), and in the process that the pressure inside the adsorption tower 14 is released to the normal pressure through the gas release port 13, the adsorption tower 14 continues to desorb the impurity gas and discharges the impurity gas from the gas release port 13. Of course, the air release port 13 may be connected to the air inlet 141, and the air release port 13 may be connected to the air outlet 142.
In some embodiments of the present application, as shown in fig. 1, the gas release port 13 is connected to the gas inlet 141 of each adsorption tower 14, and when the adsorption tower 14 is in the desorption state, the impurity gas desorbed from the adsorption tower 14 after depressurization is discharged from the gas release port 13 through the gas inlet 141, that is, the impurity gas is reversely released from the adsorption tower 14.
of course, the gas inlet 141 of each adsorption tower 14 and the gas discharge port 13 may be connected by a pipeline, and a switching device may be provided on the pipeline to switch the gas discharge port 13 and the gas inlet 141 of each adsorption tower 14.
In other embodiments of the present application, as shown in fig. 3, the gas release port 13 is connected to the gas outlet 142 of each adsorption tower 14, and when the adsorption tower 14 is in the desorption state, the desorbed impurity gas in the adsorption tower 14 after pressure reduction is discharged from the gas release port 13 through the gas outlet 142, that is, the impurity gas is sequentially discharged out of the adsorption tower 14.
Of course, the gas outlet 142 of each adsorption tower 14 and the gas discharge port 13 can be connected by a pipeline, and a switch device can be arranged on the pipeline to switch on and off the gas discharge port 13 and the gas outlet 142 of each adsorption tower 14.
as shown in fig. 1, in some embodiments of the present application, a fifth switching device 34 is disposed between the input port 11 and the air inlet port 141, and the fifth switching device 34 is configured to connect or disconnect the input port 11 and the air inlet port 141, that is, the input port 11 and the air inlet port 141 can be connected or disconnected by the fifth switching device 34; a sixth switching device 35 is disposed between the output port 12 and the air outlet 142, and the sixth switching device 35 is configured to connect or disconnect the output port 12 and the air outlet 142, that is, the input port 11 and the air outlet 142 can be connected or disconnected by the sixth switching device 35.
When the adsorption tower 14 is in the adsorption state, the fifth switching device 34 and the sixth switching device 35 corresponding to the adsorption tower 14 can be opened, so that the raw material gas can enter the adsorption tower 14 from the input port 11, and the product gas can be discharged from the output port 12; when the adsorption tower 14 is in another state, the fifth switching device 34 and the sixth switching device 35 corresponding to the adsorption tower 14 may be turned off.
after the adsorption tower 14 is depressurized and desorbed, the adsorbent particles in the adsorption tower 14 can release the adsorbed impurity gas basically, but the impurity gas may still remain in the gaps between the adsorbent particles and the adsorbent particles.
as shown in fig. 4, in some embodiments of the present application, the adsorption column 14 also has a regeneration state. The raw material gas treatment unit 10 further has an extraction opening 15, and the extraction opening 15 is connected to the gas inlet 141 or the gas outlet 142. When the adsorption column 14 is in the regeneration state, the gas in the adsorption column 14 is extracted through the extraction port 15, and the residual impurity gas in the adsorption column 14 after desorption can be discharged through the extraction port 15.
When the adsorption tower 14 is in the regeneration state, the gas in the adsorption tower 14 may be extracted through the extraction opening 15 by the air extractor, so that the residual impurity gas in the adsorption tower 14 after desorption is discharged from the extraction opening 15, thereby improving the re-adsorption capacity of the adsorbent in the adsorption tower 14. Of course, the adsorption column 14 may be evacuated by evacuating the adsorption column 14 from the evacuation port 15.
Further, a seventh switching device 36 is provided between the suction port 15 and the gas inlet 141 of each adsorption tower 14, the seventh switching device 36 being configured to connect or disconnect the suction port 15 to or from the gas inlet 141.
Specifically, the extraction opening 15 is connected to the air inlet 141 of each adsorption tower 14 through a pipe, and the seventh switching device 36 is disposed on the pipe.
When the adsorption tower 14 is in the regeneration state, the seventh switching device 36 corresponding to the adsorption tower 14 is opened to allow the other components in the adsorption tower 14 to be extracted from the extraction port 15; when the adsorption tower 14 is in another state, the seventh switching device 36 corresponding to the adsorption tower 14 may be turned off.
Of course, in other embodiments, the extraction opening 15 and the adsorption tower 14 may have other connection forms, for example, as shown in fig. 5, a seventh switch device 36 is provided between the extraction opening 15 and the air outlet 142 of each adsorption tower 14, and the seventh switch device 36 is configured to connect or disconnect the extraction opening 15 and the air outlet 142. Wherein, the extraction opening 15 is connected with the air outlet 142 of each adsorption tower 14 through a pipeline, and the seventh switching device 36 is arranged on the pipeline.
in addition to the way of exhausting the impurity gas remaining in the adsorption tower 14, in other embodiments, the impurity gas remaining in the adsorption tower 14 may be exhausted by other ways, for example, as shown in fig. 6, the raw material gas treatment unit 10 further has a flushing inlet 16 and a flushing outlet 17, the flushing inlet 16 is connected to the gas outlet 142, and the flushing outlet 17 is connected to the gas inlet 141. When the adsorption tower 14 is in the regeneration state, the adsorption tower 14 is disconnected from the gas storage device 20, and the purge gas enters the adsorption tower 14 from the purge inlet 16 and is discharged from the purge outlet 17, so that the residual impurity gas in the desorbed adsorption tower 14 is discharged from the purge outlet 17, thereby improving the re-adsorption capacity of the adsorbent in the adsorption tower 14.
Further, with continued reference to fig. 6, an eighth switching device 37 is provided between the flushing inlet 16 and the air outlet 142, the eighth switching device 37 being configured to connect or disconnect the flushing inlet 16 to the air outlet 142; a ninth switching device 38 is disposed between the flushing outlet 17 and the air inlet 141, and the ninth switching device 38 is configured to connect or disconnect the flushing outlet 17 and the air inlet 141.
Specifically, the flushing inlet 16 is connected to the air outlet 142 through a pipeline, and the eighth switching device 37 is disposed on the pipeline; the flushing outlet 17 is connected to the air inlet 141 via a pipe, on which the ninth switching device 38 is arranged.
When the adsorption tower 14 is in the regeneration state, the eighth switching device 37 and the ninth switching device 38 corresponding to the adsorption tower 14 can be opened, so that the flushing gas can enter the adsorption tower 14 from the flushing inlet 16 and be discharged from the flushing outlet 17; when the adsorption tower 14 is in another state, the eighth switching device 37 and the ninth switching device 38 corresponding to the adsorption tower 14 may be turned off.
when the adsorption tower 14 is in the regeneration state, the purge gas may be a product gas, a gas in the gas storage tank 21 of the gas storage device 20, or an external clean gas.
Of course, in still other embodiments, as shown in fig. 7, the raw material outlet unit may have both the suction port 15, the purge inlet 16 and the purge outlet 17, the suction port 15 may be connected to the gas inlet 141 or the gas outlet 142 of each adsorption column 14, the purge inlet 16 is connected to the gas outlet 142 of each adsorption column 14, and the purge outlet 17 is connected to the gas inlet 141 of each adsorption column 14. Of course, a switching device may be provided between the suction port 15 and the gas inlet 141 or between the suction port 15 and the gas outlet 142, and a switching device may be provided between the purge inlet 16 and the gas outlet 142 of each adsorption tower 14 and between the purge outlet 17 and the gas inlet 141 of each adsorption tower 14. In the above configuration, the adsorption tower 14 may be evacuated through the evacuation port 15, and the purge gas may be injected into the adsorption tower 14 through the purge inlet 16 to discharge the residual impurity gas in the adsorption tower 14 after desorption. Of course, the adsorption column 14 may be purged first and then evacuated, or the adsorption column 14 may be evacuated first and then purged.
the adsorption column 14 has a pressure required for adsorption capacity. If the adsorption pressure of the adsorption tower 14 is 5 mpa, after the gas in each gas storage tank 21 of the gas storage device 20 enters the adsorption tower 14 and raises the internal pressure of the adsorption tower 14, since each gas storage tank 21 contains a certain amount of gas, the internal pressure of the adsorption tower 14 after being raised is lower than the internal pressure of the adsorption tower 14 before being lowered, that is, lower than 5 mpa, so that the adsorption capacity of the adsorption tower 14 after being raised is limited.
therefore, in some embodiments of the present application, as shown in fig. 8, the raw material gas treatment unit 10 further has a pressure-increasing port 18, and the pressure-increasing port 18 is connected to the gas inlet 141 of each adsorption column 14, or the pressure-increasing port 18 is connected to the gas outlet 142 of each adsorption column 14. The adsorption tower 14 also has a final pressure-raising state, and when the adsorption tower 14 is in the final pressure-raising state, the adsorption tower 14 is disconnected from the gas storage device 20, and the pressure-raising gas enters the adsorption tower 14 after pressure-raising from the pressure-raising port 18.
When the adsorption tower 14 is in the final pressure-raising state, the pressure-raising gas enters the adsorption tower 14 after the pressure-raising from the pressure-raising port 18, and the pressure in the adsorption tower 14 is brought to the pressure before the pressure-lowering, thereby improving the adsorption capacity of the adsorption tower 14.
of course, if the boost port 18 is connected to the intake port 141 of each adsorption tower 14, a switching device may be provided between the boost port 18 and the intake port 141 to connect or disconnect the boost port 18 and the intake port 141; if the pressure-increasing port 18 is connected to the gas outlet 142 of each adsorption tower 14, a switching device may be provided between the pressure-increasing port 18 and the gas outlet 142 to connect or disconnect the pressure-increasing port 18 and the gas inlet 141.
When the adsorption tower 14 is in the final-stage state, the pressure-increasing gas may be a product gas or a raw gas.
In the above embodiment, the switching devices, the first switching device 30, the second switching device 31, the third switching device 32, the fourth switching device 33, the fifth switching device 34, the sixth switching device 35, the seventh switching device 36, the eighth switching device 37, and the ninth switching device 38 are all switching valves.
The embodiment of the application provides a method for adsorbing and separating gas, so that waste of effective gas is reduced, and the recovery rate of the effective gas is improved.
A method for separating gas by the adsorption tower 14 provided by the present application will be described in detail below with reference to the accompanying drawings.
As shown in fig. 9, in a method of adsorptive separation of gases, each adsorption tower 14 is subjected to a cycle comprising an adsorption step, a pressure-reducing step, a desorption step and a pressure-increasing step in this order;
Wherein the adsorption step: the adsorption tower 14 adsorbs the impurity gas in the raw material gas to obtain a product gas;
and (3) pressure reduction: communicating the adsorption tower 14 with the gas storage device 20, so that the gas in the adsorption tower 14 enters the gas storage device 20, and the pressure of the adsorption tower 14 is reduced;
a desorption step: disconnecting the adsorption tower 14 from the gas storage device 20, and discharging the impurity gas desorbed from the adsorption tower 14 after pressure reduction;
a step of boosting: the adsorption tower 14 is communicated with the gas storage device 20, so that the gas in the gas storage device 20 enters the adsorption tower 14, and the adsorption tower 14 is pressurized and has re-adsorption capacity.
In the above method, the effective gas entering the gas storage device 20 after depressurizing the adsorption tower 14 finally returns to the adsorption tower 14 again for boosting, thereby reducing the waste of the effective gas and improving the recovery rate of the effective gas.
In the desorption step, after the impurity gas is discharged from the adsorption tower 14 after the pressure reduction, the pressure in the adsorption tower 14 is normal pressure (atmospheric pressure).
in some embodiments of the present application, in the depressurization step, the respective gas storage tanks 21 of the gas storage devices 20 are communicated with the adsorption tower 14 one by one in order of high internal pressure to gradually increase the pressure in the respective gas storage tanks 21, so that the pressure in the adsorption tower 14 is gradually decreased to make the pressure in the adsorption tower 14 sufficiently low; in the pressure increasing step, the respective gas tanks 21 are communicated with the adsorption tower 14 one by one in the order of the internal pressure from low to high, so that the pressure in the respective gas tanks 21 is gradually reduced, and the pressure in the adsorption tower 14 is gradually increased, thereby increasing the pressure in the adsorption tower 14 as high as possible.
In some embodiments of the present application, as shown in fig. 10, each adsorption column 14 further comprises a regeneration step during one cycle; a regeneration step is performed after the desorption step and before the pressure increasing step, and the regeneration step comprises: the remaining impurity gas in the adsorption tower 14 is exhausted by means of air extraction.
the impurity gas remaining in the adsorption tower 14 that has undergone the desorption step is discharged by means of air extraction to improve the re-adsorption capacity of the adsorbent in the adsorption tower 14.
The regeneration step may also take other forms, and in some other embodiments of the present application, the regeneration step is performed after the desorption step and before the pressure-increasing step, and the regeneration step includes: the purge gas is injected into the adsorption tower 14, and the purge gas carries out the impurity gas remaining in the adsorption tower 14 from the adsorption tower 14.
after the adsorption tower 14 is subjected to the desorption step, a purge gas may be injected into the adsorption tower 14 to discharge the impurity gas remaining in the adsorption tower 14 subjected to the desorption step, so as to improve the re-adsorption capacity of the adsorbent in the adsorption tower 14.
The flushing gas may be a product gas, a gas in the gas storage tank 21 of the gas storage device 20, or an external clean gas.
Of course, in some embodiments of the present application, if the impurity gas in the adsorption tower 14 is extracted by air extraction, and if the impurity gas still remains in the adsorption tower 14, the impurity gas in the adsorption tower 14 may be further discharged by injecting a purge gas.
In some embodiments of the present application, as shown in fig. 11, each adsorption column 14 further comprises a final pressure-raising step in one cycle period, the final pressure-raising step being performed after the pressure-raising step, the final pressure-raising step comprising: the adsorption tower 14 is disconnected from the gas storage device 20, and the pressure-increasing gas is injected into the adsorption tower 14.
In the pressure increasing step of the adsorption tower 14, after the gas in the gas storage device 20 enters the adsorption tower 14, the pressure in the adsorption tower 14 may be lower than the pressure before the pressure reduction of the adsorption tower 14. After the pressure increasing step, the final pressure increasing step is performed, and the pressure-increasing gas is injected into the adsorption tower 14 to make the pressure in the adsorption tower 14 reach the pressure before the pressure reduction, thereby improving the adsorption capacity of the adsorption tower 14.
wherein, the pressure-raising gas can be a product gas or a raw material gas.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An apparatus for adsorptive separation of a gas comprising:
The device comprises a raw material gas treatment unit, a gas inlet and a gas outlet, wherein the raw material gas treatment unit is provided with an input port, an output port and a gas release port and comprises at least two adsorption towers which are arranged in parallel, each adsorption tower is provided with a gas inlet and a gas outlet, the gas inlet is connected with the input port, and the output port is connected with the gas outlet; and
each adsorption tower is connected with the gas storage device, and the gas storage device comprises at least three gas storage tanks which are arranged in parallel;
each adsorption tower has an adsorption state, a depressurization state, a desorption state and a pressurization state, and at least one adsorption tower in the raw material gas treatment unit is in the adsorption state;
When the adsorption tower is in an adsorption state, the adsorption tower is disconnected from a gas storage device, and the adsorption tower is configured to adsorb impurity gas in the feed gas entering from the input port to obtain product gas discharged from the output port;
When the adsorption tower is in a depressurization state, the adsorption tower is communicated with the gas storage device, so that gas in the adsorption tower enters the at least three gas storage tanks to depressurize the adsorption tower;
When the adsorption tower is in a desorption state, the adsorption tower is disconnected with the gas storage device, so that the impurity gas desorbed from the adsorption tower after pressure reduction is discharged from the gas release port;
When the adsorption tower is in a pressure boosting state, the adsorption tower is communicated with the gas storage device, so that gas in the at least three gas storage tanks enters the adsorption tower, and the pressure of the adsorption tower is boosted.
2. The apparatus for adsorptive separation of a gas according to claim 1, wherein each of said gas containers is communicated with said adsorption tower one by one in order of high to low internal pressure when said adsorption tower is in a depressurized state, so that the pressure in each of said gas containers is increased stepwise;
When the adsorption tower is in a boosting state, each gas storage tank is communicated with the adsorption tower one by one according to the sequence of internal pressure from low to high, so that the pressure in each gas storage tank is reduced step by step.
3. The apparatus according to claim 2, wherein the gas storage means is connected to the raw gas treatment unit via a first connection pipe and a second connection pipe;
The at least three gas storage tanks are connected in parallel between the first connecting pipe and the second connecting pipe, and each gas storage tank is provided with an inlet and an outlet;
A first switching device is arranged between the inlet and the first connecting pipe and is configured to connect or disconnect the inlet and the first connecting pipe;
A second switch device is arranged between the outlet and the second connecting pipe and is configured to connect or disconnect the outlet and the second connecting pipe;
A third switching device is disposed between the air inlet and the first connection pipe, and the third switching device is configured to connect or disconnect the air inlet and the first connection pipe;
a fourth switching device is arranged between the air outlet and the second connecting pipe, and the fourth switching device is configured to connect or disconnect the air outlet and the second connecting pipe.
4. The apparatus for adsorptive separation of a gas according to claim 1, wherein said purge port is connected to said gas inlet port, and wherein when said adsorption column is in a desorption state, the impurity gas desorbed from the adsorption column after pressure reduction is discharged from said purge port through said gas inlet port; or
and the gas release port is connected with the gas outlet, and when the adsorption tower is in a desorption state, the impurity gas desorbed from the adsorption tower after pressure reduction is discharged from the gas release port through the gas outlet.
5. the apparatus according to claim 1, wherein a fifth switching device is provided between the input port and the gas inlet, the fifth switching device being configured to connect or disconnect the input port to the gas inlet;
and a sixth switching device is arranged between the output port and the air outlet and is configured to connect or disconnect the output port and the air outlet.
6. The apparatus according to claim 1, wherein the feed gas treatment unit further has a suction port connected to the gas inlet or the gas outlet;
the adsorption tower is also provided with a regeneration state, and when the adsorption tower is in the regeneration state, the gas in the adsorption tower is extracted through the extraction opening, so that the residual impurity gas in the adsorption tower after desorption can be discharged from the extraction opening.
7. The apparatus according to claim 6, wherein a seventh switching device is provided between the suction port and the gas inlet, the seventh switching device being configured to connect or disconnect the suction port and the gas inlet; or
a seventh switching device is arranged between the air pumping opening and the air outlet and is configured to connect or disconnect the air pumping opening and the air outlet.
8. The apparatus according to claim 1, wherein the feed gas treatment unit further has a flush inlet and a flush outlet, the flush inlet being connected to the gas outlet, the flush outlet being connected to the gas inlet;
The adsorption tower is also provided with a regeneration state, when the adsorption tower is in the regeneration state, the adsorption tower is disconnected with the gas storage device, and flushing gas enters the adsorption tower from the flushing inlet and is discharged from the flushing outlet so as to discharge residual impurity gas in the desorbed adsorption tower from the flushing outlet.
9. The apparatus for adsorptive separation of a gas according to claim 8, wherein an eighth switching means is provided between said purge inlet and said gas outlet, said eighth switching means being configured to connect or disconnect said purge inlet to said gas outlet;
A ninth switching device is arranged between the flushing outlet and the air inlet and is configured to connect or disconnect the flushing outlet and the air inlet.
10. the apparatus for adsorptive separation of a gas according to any one of claims 1 to 9, wherein said feed gas treatment unit further comprises a pressure boost port connected to said gas inlet port or said gas outlet port;
the adsorption tower is also provided with a final pressure-rising state, when the adsorption tower is in the final pressure-rising state, the adsorption tower is disconnected from the gas storage device, and the pressure-rising gas enters the adsorption tower after pressure-rising from the pressure-rising port.
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| CN109821347A (en) * | 2019-03-28 | 2019-05-31 | 成都赛普瑞兴科技有限公司 | A kind of device and method of adsorption seperation of gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109821347A (en) * | 2019-03-28 | 2019-05-31 | 成都赛普瑞兴科技有限公司 | A kind of device and method of adsorption seperation of gas |
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