CN114748972A - Method for purifying N2 from air by using rotary distributor - Google Patents
Method for purifying N2 from air by using rotary distributor Download PDFInfo
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- CN114748972A CN114748972A CN202210256743.XA CN202210256743A CN114748972A CN 114748972 A CN114748972 A CN 114748972A CN 202210256743 A CN202210256743 A CN 202210256743A CN 114748972 A CN114748972 A CN 114748972A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0446—Means for feeding or distributing gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/10—Nitrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40001—Methods relating to additional, e.g. intermediate, treatment of process gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
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Abstract
The invention discloses a method for purifying N2 from air by using a rotary distributor, relates to equipment for purifying N2 from air, and aims to solve the problem of complex system structure caused by the fact that a pipeline is required in each step of pressure swing adsorption and cannot be shared in the prior art. The rotary distributor is creatively used in the application, the rotatable flow channel distributor is arranged in the shell of the rotary distributor, independent functional chambers with multiple functions are arranged in the flow channel distributor, and when the functional chambers with different functions are communicated or blocked from being communicated with the corresponding adsorption towers, the corresponding adsorption towers are in adsorption, pressure drop, pressure rise, sequential discharge, reverse discharge, flushing, final charging or maintaining stages and are switched among the stages; the rotary distributor can replace the original rotary valve, does not need to be provided with a complex adsorption pipeline, does not have complex bridge wiring, programming and other work, and has a simpler adsorption system structure and lower production cost.
Description
Technical Field
The invention belongs to the technical field of hydrogen production, relates to a method for producing hydrogen by using reformed gas, and more particularly relates to a method for producing hydrogen by using a rotary distributor for the reformed gas.
Background
The production process of the conversion hydrogen production is mature in chemical industry, the raw material source is wide, methanol or natural gas or methane or coal or petroleum or refined gas can be used for steam reforming conversion to obtain converted gas, then the converted gas is separated and purified by a PSA (pressure swing adsorption) process, and the yield can be 100-40000 Nm 3/h.
In the process, an Axial Fixed Bed (AFB) is generally used for pressure swing adsorption, namely, a columnar adsorption tower with the height-diameter ratio of more than 1.5 is adopted to fill an adsorbent and is vertically installed, and gas passes through an adsorption bed layer in the vertical direction (axial direction).
The AFBPSA process has the advantages of simple equipment, convenience in installation, easiness in filling of the adsorbent and the like.
But also has the following disadvantages:
1. because the valve is adopted to control the gas flow direction, a plurality of program control valves are needed to form a special valve area, so that the occupied area is large and complicated program control is needed;
2. limited by the size of the adsorption tower, if a large production volume is required, more adsorption towers need to be added, resulting in a linear increase in the number of valves;
3. with the increase of the yield requirement, a large adsorption tower and a plurality of pipelines face a large amount of loss of dead space gas in the desorption process, and the yield is reduced.
For the above deficiencies of AFBPSA, numerous solutions also appear in the prior art:
The patent application with the application number of CN202110084790.6 discloses a pressure swing adsorption process based on a multi-channel rotary valve, which comprises an adsorption mechanism, a driving mechanism, a buffer mechanism and a control device: the adsorption mechanism is filled with adsorption filler and is provided with a plurality of groups for adsorbing the product gas; the driving mechanism is arranged in the center of the plurality of groups of adsorption mechanisms and is respectively communicated with the upper end and the lower end of each adsorption mechanism so as to enable the adsorption tower to sequentially complete an adsorption process, an equal lifting/equal lowering process and an analysis process; the buffer mechanism is used for respectively storing the product gas, the finished product gas and the analysis gas; the control device comprises a programmable logic controller which is electrically connected with a frequency converter; the driving mechanism comprises an upper valve, a lower valve and a driving motor for controlling the communication or the blocking of the corresponding chambers of the upper valve and the lower valve. In the process, the communication or the blocking communication among the adsorption towers can be realized through the rotary valve, and each adsorption tower is correspondingly positioned in each stage of adsorption, pressure equalizing drop, pressure equalizing rise, forward discharge, reverse discharge, flushing and the like by adjusting the communication relation among the adsorption towers.
In addition, the utility model patent of application number CN201821779052.3 discloses a nine-tower pressure swing adsorption system's programmable valve device, it includes upper valve and lower valve, upper valve includes valve body and last case, the lower valve includes lower valve body and lower valve core, upper valve core and lower valve core are connected through the pivot, the pivot is passed the lower valve core and is connected with the motor, last nine last interfaces have been seted up on the valve body, nine lower interfaces have been seted up on the lower valve body, it is connected with the top of the tower of adsorption tower respectively through the pipeline to go up the interface, the lower interface is connected with the tower bottom of adsorption tower through the pipeline respectively, upper valve core part does not is equipped with the product gas passageway, the passageway all falls in one, the passageway all falls in two, the passageway all falls in three, finally step up passageway and upper valve sweep the passageway against the current, lower valve inside is equipped with the raw materials air inlet respectively, the adsorption channel, the lower valve sweeps the passageway against the current and takes out the vacuum passageway.
The utility model discloses a utility model patent that application number is CN201922100881.5 discloses a twelve-tower pressure swing adsorption system's rotary valve device, it includes upper valve and lower valve, the upper valve includes valve body and upper valve core, the upper valve core part is equipped with the product gas passageway respectively, an equal lift/drop passageway, two equal lift/drop passageways, three equal lift/drop passageways, four equal lift/drop passageways, the passageway that finally steps up, put in the same direction/wash a passageway, put in the same direction/wash two passageways, put in the same direction/wash three passageways, product gas sweeps the passageway, the lower valve core is inside to be equipped with raw materials air inlet respectively, the absorption passageway, wash analytic gas one discharge passageway, wash analytic gas two discharge passageways, wash analytic gas three discharge passageways, put in the opposite direction passageway, product gas sweeps discharge passageway and analytic gas discharge total passageway.
The above patent applications all propose to use the rotary valve to replace the prior numerous program control and regulating valves and to use a large number of pipelines in a matching way, thereby effectively reducing the cost and space of production and manufacturing. However, there are significant drawbacks in that the rotary valves rotate in a manner similar to jumping rather than uniform rotation, and need to rotate to a certain angle to achieve pipeline communication for performing the corresponding pressure swing adsorption step, resulting in the following disadvantages:
Firstly, the function of the traditional PSA regulating valve is not provided, the pressure rises and drops suddenly, the air flow scours the bed layer obviously, and the adsorbent is greatly influenced;
secondly, pipelines cannot be shared, each step of pressure swing adsorption needs one pipeline, the whole system is complex in structure, and production cost is high.
Disclosure of Invention
The invention aims to: in order to solve the problems of complex system structure and high production cost caused by the fact that a pipeline is needed in each step of pressure swing adsorption and cannot be shared in the prior art, a method for purifying N2 from air by using a rotary distributor is provided.
The invention specifically adopts the following technical scheme for realizing the purpose:
a rotary distributor for purifying N2 from air, comprising two adsorption columns, a rotary distributor comprising:
the shell is provided with an FG port for feeding, a PG port for product output, and a tower upper port and a tower lower port for communicating the adsorption tower;
the runner distributor is arranged in the shell and can rotate in the shell, a plurality of independent functional cavities are respectively arranged on the upper part and the lower part of the runner distributor along the circumferential direction of the runner distributor, the functional cavities on the upper part of the runner distributor sequentially comprise an A cavity and an FR cavity, and the functional cavities on the lower part of the runner distributor sequentially comprise an A cavity and a D cavity;
A cavity A at the upper part of the flow channel distributor is communicated with the PG port, communicating seams which can be communicated with the upper tower port are formed in the functional cavity at the upper part of the flow channel distributor, the cavity A at the lower part of the flow channel distributor is communicated with the FG port, a communicating seam which can be communicated with the lower tower port is formed in a cavity D at the lower part of the flow channel distributor, and sealing is realized between the flow channel distributor and the shell;
the number of the upper tower openings and the lower tower openings of the rotary distributor is the same as that of the adsorption towers, the discharge opening of each adsorption tower is communicated with the corresponding upper tower opening, and the feed opening of each adsorption tower is communicated with the corresponding lower tower opening;
taking air as raw material gas, enabling the raw material gas to enter a cavity A at the lower part of the flow channel distributor through an FG port on a shell, enabling the raw material gas to enter an adsorption tower A through a tower lower port to be adsorbed when a cavity A at the upper part of the flow channel distributor is communicated with a tower A upper port corresponding to the adsorption tower A through a communication seam, enabling N2 to enter a cavity A at the upper part of the flow channel distributor through a tower A upper port and outputting the raw material gas through a PG port; the method comprises the steps of rotating a flow channel distributor and adjusting the rotating speed of the flow channel distributor, communicating or blocking communication between different functional cavities on the flow channel distributor and different adsorption towers, connecting the functional cavities in the flow channel distributor with the adsorption towers end to end in time sequence in the cyclic operation of adsorption and desorption, and distributing feed gas in the cavities, the cavity and adsorption tower connecting pipelines and the adsorption towers so that the inner adsorption tower can repeatedly carry out adsorption and desorption steps.
Preferably, the two adsorption towers are respectively a tower A and a tower B, 1 adsorption tower is in an adsorption state at the same time, and pressure equalization is carried out for 0 time; the rotating speed of the runner distributor is 1-5 min/rad, and the yield is 5-2000 Nm3/h。
Preferably, the yield is 1200Nm3And h, the rotating speed of the flow channel distributor is 2-3 min/rad.
Preferably, the communication seams of the flow channel distributor are variable diameter communication seams, and the sizes of the variable diameter communication seams are sequentially increased along the rotation direction of the flow channel distributor.
Preferably, the two adsorption towers are tower A and tower B, the flow channel distributor in the rotary distributor is rotated, and the adsorption process and the uniform ascending/descending process are carried out through the following steps:
in the interval of time slice 1, tower A is in an adsorption state, feed gas enters cavity A at the lower part of the rotary distributor from FG port, enters cavity A at the top of the rotary distributor from the top of the cavity A after entering the bottom of the tower A, and is sent out of the system from PG pipe; the tower B is in a reverse discharge state, the top of the tower B is not communicated with the rotary distributor, the bottom of the tower B is communicated with a cavity D at the lower part of the rotary distributor, and gas is sent out of the system through a DG port;
in the interval of time slice 2, tower A keeps the adsorption state and the airflow is unchanged; the tower B is in a reverse discharge state and the airflow is unchanged;
in the interval of the time slice 3, the tower A keeps an adsorption state, and the airflow is unchanged; the tower B is in a final charging state, the bottom of the tower is not communicated with the rotating distributor, the top of the tower is communicated with an FR cavity of the rotating distributor, and the FR cavity obtains gas from the cavity A through a pipeline to charge the tower B;
In the interval of time slice 4, tower A keeps the adsorption state and the airflow is unchanged; the tower B is in a final charging state, and the airflow is unchanged;
in the interval of the time slice 5, the tower B is in an adsorption state, feed gas enters a cavity A at the lower part of the rotary distributor from an FG port, enters the cavity A at the top of the rotary distributor from the top after entering the bottom of the tower B, and is sent out of the system from a PG pipe; the tower A is in a reverse state, the top of the tower A is not communicated with the rotary distributor, the bottom of the tower A is communicated with a cavity D at the lower part of the rotary distributor, and gas is sent out of the system through a DG port;
in the interval of the time slice 6, the tower B keeps an adsorption state, and the airflow is unchanged; the tower A is in a reverse discharge state and the airflow is unchanged;
in the interval of the time slice 7, the B tower keeps the adsorption state and the air flow is unchanged; the tower A is in a final charging state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with an FR cavity of the rotary distributor, and the FR cavity obtains gas from the cavity A through a pipeline to charge the tower A;
in the interval of the time slice 8, the B tower keeps an adsorption state, and the airflow is unchanged; the tower A is in a final filling state, and the airflow is unchanged.
The invention has the following beneficial effects:
1. in the invention, a rotatable flow channel distributor is arranged in a shell of a rotary distributor, independent functional chambers with multiple functions are arranged in the flow channel distributor, and when the functional chambers with different functions are communicated or blocked from being communicated with corresponding adsorption towers, the corresponding adsorption towers are in adsorption, pressure drop, pressure rise, sequential discharge, reverse discharge, flushing, final charging or holding stages; the rotary distributor can replace the original rotary valve, does not need to be provided with a complex adsorption pipeline, does not have complex bridge wiring, programming and other work, and has a simpler adsorption system structure and lower production cost.
2. According to the invention, the communicating seams are set to be the reducing communicating seams, and the sizes of the reducing communicating seams are sequentially increased along the rotating direction of the flow channel distributor, so that the contact areas of the reducing seams, the upper tower opening and the lower tower opening are gradually increased from small (the minimum is 0) to large according to the rotating direction, the flow of the upper tower opening and the lower tower opening is uniformly changed, the pressure in the adsorption tower is also uniformly changed and cannot be suddenly increased or decreased, the uniformly changed airflow in the adsorption tower is weaker in scouring the bed layer, the adsorbent is less influenced, and the adsorption effect and the adsorption capacity of the adsorption tower are improved.
Drawings
FIG. 1 is a schematic view of the distribution of functional chambers in the upper portion of a flow channel distributor according to the present invention;
FIG. 2 is a schematic view of the distribution of functional chambers in the lower portion of the flow channel distributor of the present invention;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a diagram of the design of the pressure swing adsorption timing sequence of the present invention;
wherein A represents adsorption, the tower is in an adsorption stage, and a bottom feeding valve and a top discharging valve are opened;
d represents reverse discharge, the tower is in a reverse discharge stage, and a reverse discharge valve at the bottom is opened;
FR stands for final charge, the column is in final charge stage and the final charge valve at the top is opened.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example 1
As shown in fig. 1-2, a rotary distributor is used in a method for purifying N2 from air, comprising two adsorption columns and a rotary distributor.
The rotary distributor includes a housing and a flow distributor.
The shell is a stator which is fixed after being installed. The upper end surface or the side surface of the upper part of the shell is provided with a tower upper opening, and the lower end surface or the side surface of the lower part of the shell is provided with a tower lower opening; the upper tower opening is communicated with a product outlet of an external adsorption tower, and the lower tower opening is communicated with a feed inlet of an external adsorption diagram. In this embodiment, the number of the adsorption towers is 2, that is, the number of the tower upper openings is 2, and the tower upper openings are respectively an A tower upper opening and a B tower upper opening; the number of the tower lower openings is also 2, namely a tower lower opening A and a tower lower opening B, as shown in figures 1 and 2. In addition, an FG port for feeding is arranged at the lower part of the shell, and a PG port for outputting products is arranged at the upper part of the shell; the shell can be also provided with a reverse flushing port; the FG port for feeding, the PG port for product output and the reverse-discharge flushing port are respectively communicated with an on-site pipeline.
The runner distributor is a rotor, is arranged in the shell and can rotate in the shell. The upper part and the lower part of the flow channel distributor are respectively provided with a plurality of independent functional cavities along the circumferential direction of the flow channel distributor, and the functional cavities are cavities rather than depressed areas. The number, the position, the size and the functions of the functional cavities on the upper part and the lower part of the flow channel distributor can be set according to actual requirements, and the functional cavities on the upper part and the lower part of the flow channel distributor are not directly communicated but are communicated through the adsorption tower. The runner distributor is driven to rotate by a motor (preferably a variable frequency motor).
On the upper part of the flow channel distributor, the functional chamber of the flow channel distributor sequentially comprises a cavity A and a cavity FR along the circumferential direction of the upper part of the flow channel distributor; at the lower part of the flow channel distributor, the functional chamber of the flow channel distributor sequentially comprises a cavity A and a cavity D along the circumferential direction of the upper part of the flow channel distributor. In the upper part of the flow channel distributor, the cavity D is communicated with a VT port for emptying (namely reversely emptying and flushing outlet).
Wherein:
chamber a, representing a chamber for adsorption;
d-chamber, representing a chamber for reverse playback;
FR chamber, representing the chamber for final filling.
In addition, the flow channel distributor and the shell are sealed in a surface sealing mode; the cavity A at the lower part of the runner distributor is communicated with the FG port through a cavity communicating pipe/groove, raw material gas can enter the cavity A at the lower part of the runner distributor through the FG port, and the raw material gas in the cavity A can enter the corresponding adsorption tower through a tower lower port communicated with the cavity A; the functional cavities at the upper part of the flow channel distributor are provided with communicating seams which can be communicated with the upper opening of the tower, and because the cavities A at the upper part and the lower part of the flow channel distributor are correspondingly arranged up and down, the flow channel distributor rotates, and when the communicating seams in the cavities A are communicated with the upper opening of the tower, the whole adsorption tower enters the cavity A at the upper part of the flow channel distributor through the upper opening of the tower and the communicating seams; the cavity A at the upper part of the flow channel distributor is communicated with the PG port through a cavity communicating pipe/groove, and the gas in the cavity A at the upper part of the flow channel distributor is finally discharged through the PG port and collected.
The communicating seam of the flow channel distributor is a reducing communicating seam, and the size of the reducing communicating seam is sequentially increased along the rotating direction of the flow channel distributor. The wide part of the reducing communicating seam is the diameter of the pipe orifice of the upper opening and the lower opening of the tower, the narrow part of the reducing communicating seam is zero, the appearance of the reducing communicating seam is not limited to a certain specific shape, thus the contact area of the reducing communicating seam with the upper opening and the lower opening of the tower is gradually increased from small (the minimum is 0) to large according to the rotating direction, the whole flow change is uniform, and the pressure in the adsorption tower is also uniform.
The flow channel distributor is divided into two parts, namely the flow channel distributor comprises an upper distributor positioned at the upper part and a lower distributor positioned at the lower part, wherein a cavity A and a cavity FR are arranged on the upper distributor, a cavity A and a cavity D are arranged on the lower distributor, and the cross section of the cavity D is a sector area with an angle of 90 degrees; the upper distributor and the lower distributor rotate independently, and the rotating speed and the rotating direction are the same.
The adsorption tower and the rotary distributor can be packaged after being skid-mounted to form a square or cylindrical regular unit. The adsorbent in the adsorption tower can be filled in a layer-by-layer composite manner, and an integrated regular adsorption material can also be used; the adsorption tower is fixed on the base.
The number of the upper tower openings and the lower tower openings of the rotary distributor is the same as that of the adsorption towers, the discharge hole of each adsorption tower is communicated with the corresponding upper tower opening, and the feed hole of each adsorption tower is communicated with the corresponding lower tower opening.
In this example, air was used as the feed gas and the product gas was N2The desorption mode adopts flushing, and the recommended adopted process is as follows: 2-1-0, namely 2 adsorption towers, and carrying out pressure equalization for 0 time when 1 tower is in an adsorption state at the same time; the yield is 50-2000 Nm3The rotating speed of the flow channel distributor is 1-5 min/rad. Wherein the synthesis gas consists of the following raw materials in percentage by volume: n is a radical of hydrogen278.1％、O220.9 percent, and the balance being CO2Rare gases, etc.; preferably, the yield is 1200Nm3And h, the rotating speed of the flow channel distributor is 2-3 min/rad.
When the device works, feed gas enters the cavity A at the lower part of the flow channel distributor through the FG port on the shell, when the cavity A at the upper part of the flow channel distributor is communicated with the upper port of the tower A corresponding to the adsorption tower A through the communication seam, the feed gas enters the adsorption tower A through the lower port of the tower A for adsorption, and N2 enters the cavity A at the upper part of the flow channel distributor through the upper port of the tower A and is output through the PG port; then the flow channel distributor in the rotary distributor is rotated, along with the rotation of the flow channel distributor in the rotary distributor, different chambers on the flow channel distributor are communicated or blocked with different adsorption towers, the adsorption towers are in adsorption, pressure drop, pressure rise, sequential release, reverse release, flushing, final charging or maintaining stages, and are switched among the stages, so that all the channels in the air flow distributor are connected with the time sequence table in the cyclic operation of adsorption and desorption of each adsorption tower end to form a circle, and the operation cyclicity of the adsorption and desorption processes of Pressure Swing Adsorption (PSA) is completely formed, all the materials or process gases are uniformly and alternately distributed in each channel in the air flow distributor and each connected adsorption tower process pipeline and adsorption tower, and the Pressure Swing Adsorption (PSA) of one cycle period is simultaneously carried out on each adsorption tower and each connected corresponding adsorption tower through the rotation speed of the air flow distributor of a controllable time slice (region) And step (2) adjusting the rotation speed of the gas flow distributor to continuously change the positions of the process gases entering and exiting the adsorption towers according to different raw material gas working conditions and technical index requirements including product gas and desorption gas, so that each adsorption tower repeats the adsorption and desorption steps, and finally purification (realized during adsorption) of the N2 is realized.
In the embodiment, the rotary distributor is used for replacing a program control valve, an adjusting valve and a sensing element used in the traditional PSA separation and purification process, and complex bridge wiring, programming and other work does not exist. If vacuum analysis is adopted, the process is equipped with a vacuum pump.
Example 2
In addition to example 1, the two adsorption towers were a tower a and a tower B, respectively, and the flow channel distributor in the rotary distributor was rotated to perform the adsorption process by the following steps:
in the interval of the time slice 1, the tower A is in an adsorption state, feed gas enters a cavity A at the lower part of the rotary distributor from an FG port, enters a cavity A at the top of the rotary distributor from the top after entering the bottom of the tower A, and is sent out of the system from a PG pipe; the tower B is in a reverse discharge state, the top of the tower B is not communicated with the rotary distributor, the bottom of the tower B is communicated with a cavity D at the lower part of the rotary distributor, and gas is sent out of the system through a DG port;
in the interval of time slice 2, tower A keeps the adsorption state and the airflow is unchanged; the gas flow of the tower B in a reverse discharge state is unchanged;
in the interval of the time slice 3, the tower A keeps an adsorption state, and the airflow is unchanged; the tower B is in a final charging state, the bottom of the tower is not communicated with the rotating distributor, the top of the tower is communicated with an FR cavity of the rotating distributor, and the FR cavity obtains gas from the cavity A through a pipeline to charge the tower B;
In the interval of time slice 4, tower A keeps the adsorption state and the airflow is unchanged; the tower B is in a final charging state, and the airflow is unchanged;
in the interval of the time slice 5, the tower B is in an adsorption state, feed gas enters a cavity A at the lower part of the rotary distributor from an FG port, enters the cavity A at the top of the rotary distributor from the top after entering the bottom of the tower B, and is sent out of the system from a PG pipe; the tower A is in a reverse state, the top of the tower A is not communicated with the rotary distributor, the bottom of the tower A is communicated with a cavity D at the lower part of the rotary distributor, and gas is sent out of the system through a DG port;
in the interval of time slice 6, tower B keeps the adsorption state and the airflow is unchanged; the tower A is in a reverse discharge state and the airflow is unchanged;
in the interval of the time slice 7, the B tower keeps the adsorption state and the air flow is unchanged; the tower A is in a final charging state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with an FR cavity of the rotary distributor, and the FR cavity obtains gas from the cavity A through a pipeline to charge the tower A;
in the interval of the time slice 8, the B tower keeps an adsorption state, and the airflow is unchanged; the tower A is in a final filling state, and the airflow is unchanged.
Claims (5)
1. A method of purifying N2 from air using a rotary distributor, comprising: the device comprises two adsorption towers and a rotary distributor, wherein the number of upper tower openings and lower tower openings of the rotary distributor is the same as that of the adsorption towers, a discharge hole of each adsorption tower is communicated with the corresponding upper tower opening, and a feed hole of each adsorption tower is communicated with the corresponding lower tower opening;
The rotary distributor comprises a shell and a flow channel distributor;
the shell is provided with an FG port for feeding, a PG port for product output, a VT port for emptying, and a tower upper port and a tower lower port for communicating the adsorption tower;
the runner distributor is arranged in the shell and can rotate in the shell, a plurality of independent functional cavities are respectively arranged on the upper part and the lower part of the runner distributor along the circumferential direction of the runner distributor, the functional cavities on the upper part of the runner distributor sequentially comprise an A cavity and an FR cavity, and the functional cavities on the lower part of the runner distributor sequentially comprise an A cavity and a D cavity;
the cavity A and the cavity FR on the upper part of the flow channel distributor are both communicated with the PG port, the functional cavity on the upper part of the flow channel distributor is provided with a communicating seam which can be communicated with the upper tower port, the cavity A on the lower part of the flow channel distributor is communicated with the FG port, the cavity D is communicated with the VT port, the cavity D on the lower part of the flow channel distributor is provided with a communicating seam which can be communicated with the lower tower port, and the flow channel distributor and the shell are sealed;
taking air as raw material gas, enabling the raw material gas to enter a cavity A at the lower part of the flow channel distributor through an FG port on a shell, enabling the raw material gas to enter an adsorption tower A through a tower lower port to be adsorbed when a cavity A at the upper part of the flow channel distributor is communicated with a tower A upper port corresponding to the adsorption tower A through a communication seam, enabling N2 to enter a cavity A at the upper part of the flow channel distributor through a tower A upper port and outputting the raw material gas through a PG port; the method comprises the steps of rotating the flow channel distributor and adjusting the rotating speed of the flow channel distributor, communicating or blocking and communicating different functional chambers on the flow channel distributor with different adsorption towers, connecting the functional chambers in the flow channel distributor with the adsorption towers end to end in a time sequence in the cyclic operation of adsorption and desorption, and distributing feed gas in the chambers, connecting pipelines of the chambers and the adsorption towers so that the inner adsorption towers can repeatedly perform adsorption and desorption steps.
2. The method for purifying N2 from air by using a rotary distributor according to claim 1, wherein the two adsorbers are column A and column B, respectively, and wherein 1 adsorbers are in adsorption state at the same time, and pressure equalization is performed for 0 times; the rotating speed of the runner distributor is 1-5 min/rad, and the yield is 5-2000 Nm3/h。
3. A method for purifying N2 from air using a rotary distributor as claimed in claim 1, wherein the production rate is 1200Nm3And h, the rotating speed of the flow channel distributor is 2-3 min/rad.
4. The method for purifying N2 from air by using the rotary distributor as claimed in claim 1, wherein the communicating slits of the flow channel distributor are reducing communicating slits, and the sizes of the reducing communicating slits are increased in sequence along the rotating direction of the flow channel distributor.
5. A method of purifying N2 from air using a rotary distributor as claimed in claim 1, wherein: the two adsorption towers are respectively a tower A and a tower B, a runner distributor in the rotary distributor is rotated, and an adsorption process and an equal ascending/decreasing process are carried out through the following steps:
in the interval of the time slice 1, the tower A is in an adsorption state, feed gas enters a cavity A at the lower part of the rotary distributor from an FG port, enters a cavity A at the top of the rotary distributor from the top after entering the bottom of the tower A, and is sent out of the system from a PG pipe; the tower B is in a reverse discharge state, the top of the tower B is not communicated with the rotary distributor, the bottom of the tower B is communicated with a cavity D at the lower part of the rotary distributor, and gas is sent out of the system through a DG port;
In the interval of time slice 2, the A tower keeps the adsorption state and the airflow is unchanged; the tower B is in a reverse discharge state and the airflow is unchanged;
in the interval of the time slice 3, the tower A keeps an adsorption state, and the airflow is unchanged; the tower B is in a final charging state, the bottom of the tower is not communicated with the rotating distributor, the top of the tower is communicated with an FR cavity of the rotating distributor, and the FR cavity obtains gas from the cavity A through a pipeline to charge the tower B;
in the interval of the time slice 4, the tower A keeps an adsorption state, and the airflow is unchanged; the tower B is in a final charging state, and the airflow is unchanged;
in the interval of the time slice 5, the tower B is in an adsorption state, feed gas enters a cavity A at the lower part of the rotary distributor from an FG port, enters the cavity A at the top of the rotary distributor from the top after entering the bottom of the tower B, and is sent out of the system from a PG pipe; the tower A is in a reverse discharge state, the top of the tower A is not communicated with the rotary distributor, the bottom of the tower A is communicated with a cavity D at the lower part of the rotary distributor, and gas is sent out of the system through a DG port;
in the interval of the time slice 6, the tower B keeps an adsorption state, and the airflow is unchanged; the tower A is in a reverse discharge state and the airflow is unchanged;
in the interval of the time slice 7, the B tower keeps the adsorption state and the air flow is unchanged; the tower A is in a final charging state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with an FR cavity of the rotary distributor, and the FR cavity obtains gas from the cavity A through a pipeline to charge the tower A;
In the interval of time slice 8, tower B keeps the adsorption state and the airflow is unchanged; tower A is in the state of filling eventually, and the air current does not change.
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