CN217855343U - Device for purifying nitrogen from air - Google Patents
Device for purifying nitrogen from air Download PDFInfo
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- CN217855343U CN217855343U CN202220580998.7U CN202220580998U CN217855343U CN 217855343 U CN217855343 U CN 217855343U CN 202220580998 U CN202220580998 U CN 202220580998U CN 217855343 U CN217855343 U CN 217855343U
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Abstract
The utility model discloses a device for following purification nitrogen gas in air relates to the device of following purification nitrogen gas in the air, and its aim at solves the problem that system architecture is complicated, manufacturing cost is high that pressure swing adsorption all needs a pipeline, pipeline can not share and bring in every step among the prior art. The shell of the rotary distributor is internally provided with a rotatable flow channel distributor, and independent functional chambers with multiple functions are arranged in the flow channel distributor, 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 maintaining 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 work, and has a simpler adsorption system structure and lower production cost.
Description
Technical Field
The utility model belongs to the technical field of the nitrogen gas purification, a device of purification nitrogen gas in follow air is related to, more specifically says, relates to a device that is arranged in following the purification nitrogen gas in the air.
Background
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 at the same time, the following disadvantages exist:
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 large production 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 deficiency of AFBPSA, many solutions also appear in the prior art:
the invention 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, wherein the control device comprises the following components: 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 valve and lower valve, it includes valve body and last case to go up the valve, the lower valve includes lower valve body and lower valve core, it is connected through the pivot to go up case and lower valve core, the pivot is passed the lower valve core and is connected with the motor, it goes up the interface to have seted up nine 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, it is equipped with the product gas passageway respectively to go up the case internal part, an equal descending passageway, two equal descending passageways, three equal descending passageways, finally step up passageway and last valve and sweep the passageway against the current, lower valve inside is equipped with raw materials air inlet respectively, the adsorption passageway, lower valve sweeps the passageway against the current and takes out the vacuum.
The utility model discloses a utility model patent with application number 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 part is equipped with product gas passageway respectively in the upper valve core, the passageway of evenly rising/falling, the final passageway that steps up, put in the same direction/wash one passageway, put in the same direction/wash two passageways, put in the same direction/wash three passageways, product gas blows the passageway, lower valve core inside is equipped with raw materials air inlet respectively, the adsorption channel, wash analytic gas one discharge passageway, wash analytic gas two discharge passageways, wash analytic gas three discharge passageways, put in the opposite direction, product gas sweeps discharge passageway and analytic gas discharge total passageway.
The technical scheme that the rotary valve is used for replacing the prior numerous program control and regulating valves and a large number of pipelines is matched and used is provided by the multiple patent applications, so that the production and manufacturing cost and space are effectively reduced. However, it has a significant drawback 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:
(1) the function of the traditional PSA regulating valve is not provided, the pressure is suddenly increased and decreased, the air flow obviously scours the bed layer, and the adsorbent is greatly influenced;
(2) pipelines cannot be shared, each step of pressure swing adsorption needs one pipeline in a one-to-one correspondence mode, the whole system is complex in structure, and production cost is high.
Disclosure of Invention
The utility model aims to provide a: 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 the pipelines cannot be shared in the prior art, a device for purifying nitrogen from air is provided.
The utility model discloses a realize above-mentioned purpose and specifically adopt following technical scheme:
a device for purifying nitrogen from air 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 FR cavity at the upper part of the flow channel distributor are both communicated with the PG port, the functional cavity at 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 at 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 at 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;
the raw 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 raw gas enters the adsorption tower A through the lower port of the tower A for adsorption, and the nitrogen 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.
Preferably, the communicating seams of the flow channel distributor are variable diameter communicating seams, and the sizes of the variable diameter communicating seams are sequentially increased along the rotating direction of the flow channel distributor.
The utility model has the advantages as follows:
1. in the utility model, a rotatable flow channel distributor is arranged in the shell of the rotary distributor, and independent functional cavities with multiple functions are arranged in the flow channel distributor, when the functional cavities 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 placement, reverse placement, flushing, final charging 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 work, and has a simpler adsorption system structure and lower production cost.
2. The utility model discloses in, set up the intercommunication seam into reducing intercommunication seam, and the direction of rotation of the size flow channel distributor of reducing intercommunication seam increases in proper order, reducing seam and tower suitable for reading like this, the area of contact of tower end opening is from big to little according to the direction of rotation, the tower is suitable for reading, the flow of tower end opening is by little (minimum 0) to big crescent, whole flow variation is the uniform change, pressure in the adsorption tower also uniform change, can not swell suddenly, the air current of uniform change is more weak to the washing away of bed in the adsorption tower, the adsorbent receives the influence lessly, the adsorption effect of adsorption tower, adsorption capacity obtains promoting.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the distribution of functional chambers in the upper portion of the center flow channel distributor of the present invention;
fig. 3 is a schematic distribution diagram of the functional chambers in the lower part of the middle flow channel distributor according to the present invention;
FIG. 4 is a timing diagram of the pressure swing adsorption process 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 embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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, as 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. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
Example 1
The embodiment provides a device for purifying nitrogen from air, as shown in fig. 1, which includes two adsorption towers and a rotary distributor, wherein 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.
In this example, the number of the adsorption towers is 2, and the adsorption towers are respectively an adsorption tower a and an adsorption tower B.
The rotary distributor comprises a shell and a flow channel 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. If the rotary distributor is matched with a plurality of adsorption towers for use, a plurality of tower upper openings and tower lower openings on the shell can be arranged, and the plurality of tower upper openings and the plurality of tower lower openings are uniformly distributed along the circumferential direction of the shell. The shell is provided with an FG port for feeding, a PG port for product output, a VT port for emptying (an outlet for reverse discharge and flushing), and a tower upper port and a tower lower port for communicating the adsorption tower; wherein the PG port is communicated with a product pipeline, the FG port is communicated with a raw material pipeline, and the VT port is communicated with a vent pipeline.
Namely, the number of the tower upper openings is 2, namely the tower upper opening A and the tower upper opening B; 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 2 and 3. The feed inlet and the discharge outlet of the adsorption tower A are correspondingly communicated with the lower opening of the tower A and the upper opening of the tower A respectively, and the feed inlet and the discharge outlet of the adsorption tower B are correspondingly communicated with the lower opening of the tower B and the upper opening of the tower B respectively.
The runner distributor is a stator, 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 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 runner distributor is driven to rotate by a motor (preferably a variable frequency motor). The functional cavity on the upper part of the flow channel distributor sequentially comprises an A cavity and an FR cavity. The functional cavity at the lower part of the flow channel distributor sequentially comprises a cavity A and a cavity D.
A chamber on runner distributor upper portion, FR chamber all communicate with PG mouth, and the intercommunication seam that can communicate with tower suitable for reading is all seted up to the function cavity on runner distributor upper portion, and A chamber and FG mouth intercommunication, D chamber and VT mouth intercommunication of runner distributor lower part, the D chamber of runner distributor lower part set up can with the intercommunication seam of tower suitable for reading intercommunication, realize sealing between runner distributor and the shell.
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. When reverse releasing and flushing are needed, the VT port can be used as an outlet for reverse releasing and flushing.
The adsorption tower and the rotary distributor can be packaged after being skid-mounted to form a regular unit in a square or cylindrical shape. The adsorbent in the adsorption tower can be filled according to layer composite filling, and an integrated regular adsorption material can also be used; the adsorption tower is fixed on the base.
In this embodiment, air is used as a raw material gas, a product gas is nitrogen, a desorption method adopts flushing, and the recommended 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 Nm 3 The 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: 78.1% of nitrogen and O 2 20.9 percent, and the balance being CO 2 Rare gases, etc.; preferably, the yield is 1200Nm 3 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 nitrogen 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, different chambers on the flow channel distributor are communicated or blocked 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, sequential release, reverse release, flushing, final charging or maintaining stages, and are changed among the stages, so that all the channels in the flow channel 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 flow channel 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 step in the adsorption and desorption processes through the rotation speed of the flow channel distributor of a controllable time slice (PSA area) and each connected corresponding adsorption tower, and the process gas position of the adsorption tower is continuously adjusted according to the requirements of different raw material gas conditions and technical indexes including product gas and desorption gas, so that the rotation speed of the adsorption and the adsorption tower is continuously changed when the adsorption and the purification steps of each adsorption tower are continuously realized.
In the embodiment, the rotatable flow channel distributor is arranged in the shell of the rotary distributor, and the independent functional chambers with multiple functions are arranged in the flow channel distributor, so that the corresponding adsorption tower is in adsorption, pressure drop, pressure rise, sequential discharge, reverse discharge, flushing, final charging or maintaining stages when the functional chambers with different functions are communicated or blocked from being communicated with the corresponding adsorption tower; the rotary distributor can replace the original rotary valve, does not need to be provided with a complex adsorption pipeline, does not have the complex work of bridge wiring, programming and the like, and has the advantages of simpler adsorption system structure and lower production cost.
Example 2
On the basis of example 1, the flow channel distributor in the rotary distributor was rotated, and the adsorption process was performed by the following steps, as shown in fig. 4:
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 time slice 3, tower A keeps the 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 (flame front) 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 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 time slice 7, tower B 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 rotating distributor, the top of the tower is communicated with an FR (flame front) cavity of the rotating 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.
Example 3
On the basis of the embodiment 1, 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.
In the embodiment, the communicating seam is set to be the reducing communicating seam, the size of the reducing communicating seam is sequentially increased along the rotating direction of the flow channel distributor, so that the contact area of the reducing seam with the upper opening of the tower and the lower opening of the tower is gradually increased from small (0 in the minimum) to large according to the rotating direction, the whole flow change is uniform, the pressure in the adsorption tower is also uniformly changed and cannot suddenly rise or fall, the uniform 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.
Claims (2)
1. A device for purifying nitrogen from air is characterized by comprising 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 FR cavity at the upper part of the flow channel distributor are both communicated with the PG port, the functional cavity at 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 at 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 at 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;
the raw 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 opening of the tower A corresponding to the adsorption tower A through the communication seam, the raw gas enters the adsorption tower A through the lower opening of the tower A for adsorption, and the nitrogen 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.
2. The apparatus for purifying nitrogen from air as claimed in claim 1, wherein the communicating slits of the flow channel distributor are diameter-variable communicating slits, and the size of the diameter-variable communicating slits increases in sequence along the rotation direction of the flow channel distributor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220580998.7U CN217855343U (en) | 2022-03-16 | 2022-03-16 | Device for purifying nitrogen from air |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220580998.7U CN217855343U (en) | 2022-03-16 | 2022-03-16 | Device for purifying nitrogen from air |
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| CN217855343U true CN217855343U (en) | 2022-11-22 |
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| CN202220580998.7U Active CN217855343U (en) | 2022-03-16 | 2022-03-16 | Device for purifying nitrogen from air |
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