CN114748972B - A rotary distributor for purifying N from air 2 Is a method of (2) - Google Patents

A rotary distributor for purifying N from air 2 Is a method of (2) Download PDF

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Publication number
CN114748972B
CN114748972B CN202210256743.XA CN202210256743A CN114748972B CN 114748972 B CN114748972 B CN 114748972B CN 202210256743 A CN202210256743 A CN 202210256743A CN 114748972 B CN114748972 B CN 114748972B
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tower
adsorption
distributor
cavity
port
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CN114748972A (en
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钟雨明
陈运
汪兰海
詹家聪
陈勇
蔡跃明
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Sichuan Techairs Co ltd
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Sichuan Techairs Co ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Gases By Adsorption (AREA)

Abstract

The utility model discloses a method for purifying N2 from air by a rotary distributor, relates to a device for purifying N2 from air, and aims to solve the problem that in the prior art, a pipeline is needed in each step of pressure swing adsorption, and the pipeline cannot be shared, so that the system structure is complex. The rotary distributor is creatively used in the application, a rotatable flow channel distributor is arranged in a 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 with or blocked from the corresponding adsorption towers, the corresponding adsorption towers are in adsorption, pressure drop, pressure rise, forward discharge, reverse discharge, flushing, final charging or holding stages, and the stages are switched; 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 works, and has simpler structure of an adsorption system and lower production cost.

Description

A rotary distributor for purifying N from air 2 Is a method of (2)
Technical Field
The utility model belongs to the technical field of hydrogen production, and relates to a method for producing hydrogen by using converted gas, in particular to a method for producing hydrogen by using a rotary distributor.
Background
The production process of the conversion hydrogen production is mature in chemical industry, the raw material sources are wide, the conversion gas can be obtained by using methanol or natural gas or methane or coal or petroleum or refined gas to carry out steam reforming conversion, then the PSA process is used for separation and purification, and the yield can be 100-40000 Nm3/h.
In the process, axial Fixed Bed (AFB) is commonly used for pressure swing adsorption, i.e. a columnar adsorption tower with the height-to-diameter ratio of more than 1.5 is adopted for filling adsorbent, the adsorption tower is vertically arranged, and gas passes through the adsorption bed layer in the vertical direction (axial direction).
The AFBPSA process has the advantages of simple equipment, convenient installation, easy filling of the adsorbent and the like.
But at the same time the following disadvantages are present:
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 columns, if a large throughput is required, more adsorption columns need to be added, resulting in a linear increase in the number of valves;
3. as the production requirements increase, large columns and numerous pipes face a significant loss of dead space gas during desorption, and the yield decreases.
For the deficiencies above AFBPSA, numerous solutions also appear in the prior art:
the utility model 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 and a buffer mechanism, and a control device: the adsorption mechanism is filled with adsorption fillers and 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 and lower ends of the adsorption mechanisms, so that the adsorption tower sequentially completes the adsorption process, the uniform lifting/uniform lowering process and the analysis process; the buffer mechanism is used for storing product gas, finished product gas and analysis gas respectively; the control device comprises a programmable logic controller, and the programmable logic controller is electrically connected with a frequency converter; the driving mechanism comprises an upper valve, a lower valve and a driving motor for controlling the upper valve and the lower valve to be communicated or blocked corresponding to the cavity. In the process, the rotary valve can be used for realizing or blocking the communication between the adsorption towers, and the communication relation among the adsorption towers is regulated to ensure that each adsorption tower is correspondingly positioned in each stage of adsorption, uniform pressure drop, uniform pressure rising, sequential discharge, reverse discharge, flushing and the like.
In addition, the utility model patent with the application number of CN201821779052.3 discloses a program-controlled valve device of a nine-tower pressure swing adsorption system, which comprises an upper valve and a lower valve, wherein the upper valve comprises an upper valve body and an upper valve core, the lower valve comprises a lower valve body and a lower valve core, the upper valve core and the lower valve core are connected through a rotating shaft, the rotating shaft penetrates through the lower valve core to be connected with a motor, nine upper interfaces are arranged on the upper valve body, nine lower interfaces are arranged on the lower valve body, the upper interfaces are respectively connected with the top of an adsorption tower through pipelines, the lower interfaces are respectively connected with the bottom of the adsorption tower through pipelines, a product gas channel, a uniform descending channel, a two uniform descending channel, a three uniform descending channel, a final boosting channel and an upper valve countercurrent purging channel are respectively arranged in the upper valve core, and a raw material gas inlet, an adsorption channel, a lower valve countercurrent purging channel and a vacuumizing channel are respectively arranged in the lower valve core.
The utility model patent with the application number of CN201922100881.5 discloses a rotary valve device of a twelve-tower pressure swing adsorption system, which comprises an upper valve and a lower valve, wherein the upper valve comprises an upper valve body and an upper valve core, a product gas channel, a uniform lifting/lowering channel, a two uniform lifting/lowering channel, a three uniform lifting/lowering channel, a four uniform lifting/lowering channel, a final pressure increasing channel, a forward discharging/flushing channel and a product gas purging channel are respectively arranged in the upper valve core, and a raw material gas inlet, an adsorption channel, a flushing analytic gas discharging channel, a reverse discharging channel, a product gas purging discharging channel and an analytic gas discharging total channel are respectively arranged in the lower valve core.
The above-mentioned many patent applications all propose the technical scheme that uses the rotary valve to replace numerous programme-controlled and governing valves before, and supporting a large amount of pipelines of using, have effectively reduced cost and space of manufacturing. However, it also has a significant drawback that the rotary valves rotate in a manner similar to runout but not at constant speed, and need to be turned to a certain angle to achieve the pipeline communication and perform the corresponding pressure swing adsorption step, resulting in the following drawbacks:
(1) the function of the traditional PSA regulating valve is not provided, the pressure suddenly rises and drops, the bed is obviously washed by airflow, and the adsorbent is greatly influenced;
(2) the pipelines cannot be shared, each step of pressure swing adsorption needs to be in one-to-one correspondence with one pipeline, the whole system has a complex structure, and the production cost is high.
Disclosure of Invention
The utility model aims at: in order to solve the problems of complex system structure and high production cost caused by the fact that one pipeline is needed in each step of pressure swing adsorption and the pipelines cannot be shared in the prior art, the method for purifying N2 from air by using the rotary distributor is provided.
The utility model adopts the following technical scheme for realizing the purposes:
a method for purifying N2 from air using a rotary distributor comprising two adsorption towers, a rotary distributor comprising:
the shell is provided with an FG (FG) port for feeding, a PG port for outputting products and a tower upper port and a tower lower port for communicating an adsorption tower;
the flow channel distributor is arranged in the shell and can rotate in the shell, a plurality of independent functional chambers are respectively arranged at the upper part and the lower part of the flow channel distributor along the circumferential direction of the flow channel distributor, the functional chambers at the upper part of the flow channel distributor sequentially comprise an A chamber and an FR chamber, and the functional chambers at the lower part of the flow channel distributor sequentially comprise an A chamber and a D chamber;
the cavity A at the upper part of the flow channel distributor is communicated with the PG port, the functional cavities at the upper part of the flow channel distributor are all provided with communication slots which can be communicated with the tower upper port, the cavity A at the lower part of the flow channel distributor is communicated with the FG port, the cavity D at the lower part of the flow channel distributor is provided with communication slots which can be communicated with the tower lower port, and the flow channel distributor is sealed with a shell;
the number of the tower upper ports and the tower lower ports of the rotary distributor is the same as that of the adsorption towers, the discharge port of each adsorption tower is communicated with the corresponding tower upper port, and the feed port of each adsorption tower is communicated with the corresponding tower lower port;
taking air as raw material gas, enabling the raw material gas to enter an A cavity at the lower part of the flow channel distributor through an FG port on the shell, enabling the raw material gas to enter an adsorption tower A through a lower port of the A tower for adsorption when the A cavity at the upper part of the flow channel distributor is communicated with an upper port of the A tower corresponding to the adsorption tower A through a communication joint, and enabling N2 to enter the A cavity at the upper part of the flow channel distributor through the upper port of the A tower and be output through a PG port; the flow channel distributor is rotated, the rotating speed of the flow channel distributor is regulated, different functional chambers on the flow channel distributor are communicated or blocked from being communicated with different adsorption towers, each functional chamber in the flow channel distributor is connected with each adsorption tower in an end-to-end mode at the time sequence in the cyclic operation of adsorption and desorption, and raw material gas is distributed in each chamber, the connecting pipeline of the chamber and the adsorption tower and each adsorption tower, so that the adsorption and desorption steps of the inner adsorption tower are repeated.
Preferably, the two adsorption towers are respectively an A tower and a B tower, 1 adsorption tower is in an adsorption state at the same time, and 0 times of pressure equalization are carried out; the rotation speed of the flow channel distributor is 1-5 min/rad, and the yield is 5-2000 Nm 3 /h。
Preferably, the yield is 1200Nm 3 And/h, the rotating speed of the flow channel distributor is 2-3 min/rad.
Preferably, the communication slits of the flow path distributor are variable-diameter communication slits, and the sizes of the variable-diameter communication slits increase in sequence along the rotation direction of the flow path distributor.
Preferably, the two adsorption towers are a tower a and a tower B, respectively, and the flow channel distributor in the rotary distributor is rotated, and the adsorption process, the uniform lifting/uniform lowering process are performed by:
in the interval of the time slice 1, the tower A is in an adsorption state, raw material 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 of the tower A 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 the time slice 2, the tower A keeps an adsorption state, and the air flow is unchanged; the air flow of the tower B is unchanged when the tower B is in a reverse discharge state;
in the interval of the time slice 3, the tower A keeps an adsorption state, and the air flow is unchanged; the tower B is in a final filling state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with the FR cavity of the rotary distributor, the FR cavity obtains gas from the A cavity through a pipeline, and the tower B is pressurized;
in the interval of the time slice 4, the tower A keeps an adsorption state, and the air flow is unchanged; the tower B is in a final charging state, and the air flow is unchanged;
in the interval of the time slice 5, the tower B is in an adsorption state, raw material 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 of the tower B 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 air flow is unchanged; the air flow of the tower A is unchanged when the tower A is in a reverse discharge state;
in the interval of the time slice 7, the tower B keeps an adsorption state, and the air flow is unchanged; the tower A is in a final filling state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with the 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 tower B keeps an adsorption state, and the air flow is unchanged; the tower A is in a final charging state, and the air flow is unchanged.
The beneficial effects of the utility model are as follows:
1. in the utility model, a rotatable flow channel distributor is arranged in a shell of a rotary distributor, and independent functional chambers with multiple functions are arranged in the flow channel distributor, so that when the functional chambers with different functions are communicated with or blocked from being communicated with corresponding adsorption towers, the corresponding adsorption towers are in adsorption, pressure drop, pressure rise, forward discharge, reverse discharge, flushing, final filling or maintaining 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 works, and has simpler structure of an adsorption system and lower production cost.
2. In the utility model, the communication slots are set as reducing communication slots, and the sizes of the reducing communication slots are sequentially increased along the rotation direction of the flow channel distributor, so that the contact areas of the reducing slots with the upper opening and the lower opening of the tower are gradually increased from small to large according to the rotation direction, the flow rates of the upper opening and the lower opening of the tower are gradually increased from small (minimum 0) to large, the whole flow rate change is uniform, the pressure in the adsorption tower is also uniformly changed, sudden rising and falling are avoided, the scouring of the bed layer by the uniformly changed airflow in the adsorption tower is weaker, the influence of the adsorbent is smaller, and the adsorption effect and the adsorption capacity of the adsorption tower are improved.
Drawings
FIG. 1 is a schematic diagram of the distribution of functional chambers in the upper portion of a flow channel distributor according to the present utility model;
FIG. 2 is a schematic diagram of the distribution of functional chambers in the lower portion of a flow distributor according to the present utility model;
FIG. 3 is a schematic diagram of the structure of the present utility model;
FIG. 4 is a schematic diagram of a pressure swing adsorption timing scheme in accordance with the present utility model;
wherein A represents adsorption, the tower is in an adsorption stage, and a feeding valve at the bottom of the tower and a discharging valve at the top of the tower 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 the final charge phase, the top final charge valve is open.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model 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 utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1-2, a rotary distributor is used for purifying N2 from air, comprising two adsorption towers and a rotary distributor.
The rotary distributor includes a housing and a flow path distributor.
The shell is a stator, and is fixed after being installed. A tower upper opening is formed in the upper end surface or the side surface of the upper part of the shell, and a tower lower opening is formed in the lower end surface or the side surface of the lower part of the shell; the upper opening of the tower is communicated with the product outlet of the external adsorption tower, and the lower opening of the tower is communicated with the feed inlet of the external adsorption diagram. In the embodiment, the number of the adsorption towers is 2, namely the number of the tower upper ports is 2, namely the tower upper ports A and the tower upper ports B are respectively; the number of the tower lower openings is 2, namely an A tower lower opening and a B tower lower opening, as shown in figures 1 and 2. In addition, FG port for feeding is arranged at the lower part of the shell, 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 of the feeding, the PG port of the output of the product and the reverse flushing port are respectively communicated with the on-site pipeline.
The runner distributor is a rotor, the runner distributor is arranged in the shell, and the runner distributor 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 chambers along the circumferential direction of the flow channel distributor, and the functional chambers are cavities instead of concave areas. The number, the positions, the sizes and the functions of the functional chambers at the upper part and the lower part of the flow channel distributor can be set according to actual requirements, and the functional chambers at the upper part and the lower part of the flow channel distributor are not directly communicated, but are communicated through the adsorption tower. The flow channel distributor is driven to rotate by a motor (preferably a variable frequency motor).
The functional chamber of the upper part of the flow channel distributor sequentially comprises an A cavity and an FR cavity along the circumferential direction of the upper part of the flow channel distributor; the functional chambers of the lower part of the flow channel distributor sequentially comprise an A chamber and a D chamber along the circumferential direction of the upper part of the flow channel distributor. In the upper part of the flow channel distributor, the D cavity is communicated with a VT port for emptying (namely, reverse discharging and flushing).
Wherein:
a chamber a representing a chamber for adsorption;
a D cavity representing a cavity for reverse discharge;
FR cavity, representing the chamber for the final filling.
In addition, the sealing between the flow channel distributor and the shell is realized in a face sealing mode; the cavity A at the lower part of the flow channel 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 flow channel distributor through the FG port, and raw material gas in the cavity A can enter a corresponding adsorption tower through a tower lower port communicated with the cavity A; the functional chambers at the upper part of the flow channel distributor are provided with communication slits which can be communicated with the upper opening of the tower, and as the A cavity 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 communication slits in the A cavity are communicated with the upper opening of the tower, the whole in the adsorption tower enters the A cavity at the upper part of the flow channel distributor through the upper opening of the tower and the communication slits; 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 and collected through the PG port.
The communication slot of the flow channel distributor is set as a variable-diameter communication slot, and the size of the variable-diameter communication slot is sequentially increased along the rotation direction of the flow channel distributor. The wide part of the reducing communication slot is the pipe orifice diameter of the upper opening and the lower opening of the tower, the narrow part of the reducing communication slot is zero, the appearance of the reducing communication slot is not limited to a specific shape, thus the contact area between the reducing slot and the upper opening and the lower opening of the tower is gradually increased from small (minimum 0) to large according to the rotation direction, the whole flow change is uniform, and the pressure in the adsorption tower is also uniformly changed.
The flow channel distributor is split 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 an A cavity and an FR cavity are formed in the upper distributor, an A cavity and a D cavity are formed in the lower distributor, and the cross section of the D cavity is a sector area with 90 degrees; the upper distributor and the lower distributor independently rotate, and the rotating speeds and the rotating directions are the same.
After the adsorption tower and the rotary distributor are skid-mounted, the adsorption tower and the rotary distributor can be packaged again to manufacture square or cylindrical regular units. The adsorbent in the adsorption tower can be filled in a layered composite manner, and an integrated regular adsorption material can 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 opening of each adsorption tower is communicated with the corresponding upper tower opening, and the feed inlet of each adsorption tower is communicated with the corresponding lower tower opening.
The implementation isIn the example, air is used as raw material gas, and the product gas is N 2 The desorption mode adopts flushing, and the recommended process is as follows: 2-1-0, namely 2 adsorption towers, wherein 1 tower is in an adsorption state at the same time, and 0 times of pressure equalizing is carried out; the yield is 50-2000 Nm 3 And/h, the rotating speed of the flow channel distributor is 1-5 min/rad. Wherein, the synthesis gas is composed of the following raw materials by volume percent: n (N) 2 78.1％、O 2 20.9% and the balance of CO 2 Rare gases, etc.; preferably, the yield is 1200Nm 3 And/h, the rotating speed of the flow channel distributor is 2-3 min/rad.
During operation, raw gas enters an A cavity at the lower part of the flow channel distributor through an FG port on the shell, and when the A cavity at the upper part of the flow channel distributor is communicated with an A tower upper port corresponding to an adsorption tower A through a communication joint, raw gas enters the adsorption tower A through an A tower lower port to be adsorbed, and N2 enters the A cavity at the upper part of the flow channel distributor through an A tower upper port and is output through a PG port; and then rotating a flow channel distributor in the rotary distributor, wherein different chambers on the flow channel distributor are communicated or blocked and communicated with different adsorption towers along with the rotation of the flow channel distributor in the rotary distributor, the adsorption towers are in adsorption, pressure drop, pressure rise, forward discharge, reverse discharge, flushing, final filling or maintaining stages, and the conversion is carried out among the stages, so that the time sequence meter in the cyclic operation of adsorption and desorption carried out by each channel in the air flow distributor and each adsorption tower is connected end to form a circle, the operation circularity of the adsorption and desorption process of Pressure Swing Adsorption (PSA) is integrally formed, all materials or process gases are uniformly and alternately distributed in each channel in the air flow distributor and each connected process pipeline and adsorption tower, the Pressure Swing Adsorption (PSA) of one cycle period is respectively and simultaneously adsorbed and desorbed by each step in the process through the air flow distributor rotation speed of a controllable time slice (zone), and the process gas position of the adsorption tower is continuously changed by adjusting the air flow distributor rotation speed according to different raw material gas working conditions and technical index requirements including product gas and desorption, and each adsorption and desorption step (N) is realized, and the final adsorption and desorption (N) are realized.
In the embodiment, a rotary distributor is used for replacing a program control valve, a regulating valve and a sensing element used by the traditional PSA in the traditional PSA separation and purification process, and no complicated bridge wiring, programming and other works exist. If vacuum analysis is adopted, a vacuum pump is arranged in the process.
Example 2
Based on example 1, the two adsorption towers were a tower and B tower, respectively, and the flow path distributor in the rotary distributor was rotated, and the adsorption process procedure was performed by the following steps:
in the interval of the time slice 1, the tower A is in an adsorption state, raw material 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 of the tower A 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 the time slice 2, the tower A keeps an adsorption state, and the air flow is unchanged; the air flow of the tower B is unchanged when the tower B is in a reverse discharge state;
in the interval of the time slice 3, the tower A keeps an adsorption state, and the air flow is unchanged; the tower B is in a final filling state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with the FR cavity of the rotary distributor, the FR cavity obtains gas from the A cavity through a pipeline, and the tower B is pressurized;
in the interval of the time slice 4, the tower A keeps an adsorption state, and the air flow is unchanged; the tower B is in a final charging state, and the air flow is unchanged;
in the interval of the time slice 5, the tower B is in an adsorption state, raw material 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 of the tower B 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 air flow is unchanged; the air flow of the tower A is unchanged when the tower A is in a reverse discharge state;
in the interval of the time slice 7, the tower B keeps an adsorption state, and the air flow is unchanged; the tower A is in a final filling state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with the 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 tower B keeps an adsorption state, and the air flow is unchanged; the tower A is in a final charging state, and the air flow is unchanged.

Claims (4)

1. A rotary distributor for purifying N from air 2 Is characterized in that: the device comprises two adsorption towers and a rotary distributor, wherein the number of the upper tower ports and the lower tower ports of the rotary distributor is the same as that of the adsorption towers, the discharge port of each adsorption tower is communicated with the corresponding upper tower port, and the feed port of each adsorption tower is communicated with the corresponding lower tower port;
the rotary distributor comprises a shell and a runner distributor;
the shell is provided with an FG (FG) port for feeding, a PG port for outputting products, a VT port for emptying, and a tower upper port and a tower lower port for communicating an adsorption tower;
the flow channel distributor is arranged in the shell and can rotate in the shell, a plurality of independent functional chambers are respectively arranged at the upper part and the lower part of the flow channel distributor along the circumferential direction of the flow channel distributor, the functional chambers at the upper part of the flow channel distributor sequentially comprise an A chamber and an FR chamber, and the functional chambers at the lower part of the flow channel distributor sequentially comprise an A chamber and a D chamber;
the A cavity and the FR cavity at the upper part of the flow channel distributor are communicated with the PG port, the functional cavity at the upper part of the flow channel distributor is provided with a communication slot which can be communicated with the tower upper port, the A cavity at the lower part of the flow channel distributor is communicated with the FG port, the D cavity is communicated with the VT port, the D cavity at the lower part of the flow channel distributor is provided with a communication slot which can be communicated with the tower lower port, and the flow channel distributor and the shell are sealed; the communication slots of the flow channel distributor are reducing communication slots, and the sizes of the reducing communication slots are sequentially increased along the rotation direction of the flow channel distributor;
taking air as raw material gas, enabling the raw material gas to enter an A cavity at the lower part of a flow channel distributor through an FG (exhaust gas) port on a shell, and enabling the raw material gas to enter an adsorption tower A for adsorption through a lower port of the A tower when the A cavity at the upper part of the flow channel distributor is communicated with an upper port of the A tower corresponding to the adsorption tower A through a communication joint, wherein N is the same as the FG port on the shell 2 The flow enters the cavity A at the upper part of the flow channel distributor through the upper opening of the tower A and is output through the PG port; rotating the flow channel distributor and regulating the rotating speed of the flow channel distributor, wherein different functional chambers on the flow channel distributor are communicated or blocked from being communicated with different adsorption towers, each functional chamber in the flow channel distributor is connected with each adsorption tower end to end at a time sequence in the cyclic operation of adsorption and desorption, and raw material gas is distributed in each chamber, a connecting pipeline of the chamber and the adsorption tower and each adsorption tower, so that each adsorption tower repeatedly adsorbs and desorbs;
wherein:
a chamber a representing a chamber for adsorption;
a D cavity representing a cavity for reverse discharge;
FR cavity, representing the chamber for the final filling.
2. A rotary distributor for purifying N from air according to claim 1 2 The method is characterized in that two adsorption towers are respectively an A tower and a B tower, 1 adsorption tower is in an adsorption state at the same time, and 0 times of pressure equalization are carried out; the rotation speed of the flow channel distributor is 1-5 min/rad, and the yield is 5-2000 Nm 3 /h。
3. A rotary distributor for purifying N from air according to claim 1 2 Is characterized in that the yield is 1200Nm 3 And/h, the rotating speed of the flow channel distributor is 2-3 min/rad.
4. A rotary distributor for purifying N from air as claimed in claim 1 2 Is characterized in that: the two adsorption towers are a tower A and a tower B respectively, and the runner distributor in the rotary distributor is rotated, and the adsorption process and the uniform lifting/uniform lowering process are carried out through the following steps:
in the interval of the time slice 1, the tower A is in an adsorption state, raw material 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 of the tower A 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 the time slice 2, the tower A keeps an adsorption state, and the air flow is unchanged; the air flow of the tower B is unchanged when the tower B is in a reverse discharge state;
in the interval of the time slice 3, the tower A keeps an adsorption state, and the air flow is unchanged; the tower B is in a final filling state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with the FR cavity of the rotary distributor, the FR cavity obtains gas from the A cavity through a pipeline, and the tower B is pressurized;
in the interval of the time slice 4, the tower A keeps an adsorption state, and the air flow is unchanged; the tower B is in a final charging state, and the air flow is unchanged;
in the interval of the time slice 5, the tower B is in an adsorption state, raw material 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 of the tower B 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 air flow is unchanged; the air flow of the tower A is unchanged when the tower A is in a reverse discharge state;
in the interval of the time slice 7, the tower B keeps an adsorption state, and the air flow is unchanged; the tower A is in a final filling state, the bottom of the tower is not communicated with the rotary distributor, the top of the tower is communicated with the 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 tower B keeps an adsorption state, and the air flow is unchanged; the tower A is in a final charging state, and the air flow is unchanged.
CN202210256743.XA 2022-03-16 2022-03-16 A rotary distributor for purifying N from air 2 Is a method of (2) Active CN114748972B (en)

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US7011693B2 (en) * 2003-11-12 2006-03-14 General Motors Corporation Control of a hydrogen purifying pressure swing adsorption unit in fuel processor module for hydrogen generation
CN106763910B (en) * 2017-01-22 2023-08-11 成都赛普瑞兴科技有限公司 Rotating device and gas separation device
CN107224840B (en) * 2017-07-10 2023-07-18 成都赛普瑞兴科技有限公司 N (N) 2 Purification system and gas treatment system
CN111375292B (en) * 2018-12-31 2021-05-04 中国石油化工股份有限公司 High-purity gas preparation device
CN113117452A (en) * 2021-04-16 2021-07-16 连云港欧亚气体有限公司 Pressure swing adsorption device is used in production of high-purity oxygen
CN215539641U (en) * 2021-07-02 2022-01-18 中国石油化工股份有限公司 Device for improving CO absorption rate of pressure swing adsorption device product
CN113304581B (en) * 2021-07-28 2021-11-26 山东神驰石化有限公司 Novel PSA adsorption separation device

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