CN112403199B

CN112403199B - Molecular sieve circulating device of PSA (pressure swing adsorption) bed

Info

Publication number: CN112403199B
Application number: CN202011286314.4A
Authority: CN
Inventors: 侯秋华; 蒋建荣; 何彦甫; 冯成方
Original assignee: Hangzhou Tianli Air Separation Equipment Manufacturing Co ltd
Current assignee: Hangzhou Tianli Air Separation Equipment Manufacturing Co ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2022-06-24
Anticipated expiration: 2040-11-17
Also published as: CN112403199A

Abstract

The invention discloses a molecular sieve circulating device of a PSA adsorption bed, which belongs to air separation equipment and comprises a cylinder, an air inlet end enclosure and an air outlet end enclosure, wherein the air inlet end enclosure and the air outlet end enclosure are arranged at two ends of the cylinder and are respectively welded with ports at two ends of the cylinder, an adsorption bed is arranged in the cylinder, a molecular sieve is filled in the adsorption bed, an air inlet pipe is arranged on the air inlet end enclosure, an air outlet device is arranged on the air outlet end enclosure, the air outlet device comprises a jacket pipe and a compensation pressing device, a main vibrating rod and a powder recovery channel are arranged in the cylinder, and the pulverized molecular sieve can fall into the powder recovery channel downwards under the vibration effect, so that the problems that the air inlet channel is blocked, uneven gaps are formed among the molecular sieves and the like due to the accumulation of the pulverized molecular sieve in the prior art are solved.

Description

Molecular sieve circulating device of PSA adsorption bed

Technical Field

The invention relates to an air separation plant device, in particular to a molecular sieve circulating device of a PSA adsorption bed.

Background

In modern industry, in order to obtain high-quality and low-cost oxygen and nitrogen, pressure swing adsorption is widely applied, a pressure swing adsorption system adopts two or more than two towers of adsorption bed to carry out alternate switching work, an adsorption material adopts a molecular sieve, in a general adsorption system, an air inlet pipe and an air outlet pipe are directly contacted with the molecular sieve, the adsorption and regeneration of the adsorption beds are alternately carried out, so that the pressure of the adsorption beds is continuously changed, the loosening of the adsorption beds is easily caused, the excessive friction and pulverization of molecular sieve particles are caused to form micro gaps, meanwhile, the pulverized molecular sieve can be continuously deposited at the bottom of the adsorption beds, so that the air inlet pipe is blocked, so that gas cannot normally enter the adsorption beds, in addition, due to the uneven distribution of the gaps, air flow is easily and intensively blown to larger positions, so that the local overload of the molecular sieve is caused, the adsorption capacity is reduced, and the air flow at smaller positions of the gaps is smaller, the utilization rate of the molecular sieve is low.

For example, chinese patent No. CN92236007.3, the name is split type adsorption tank's utility model patent, adsorption tank is by the upper cover, the jar body and low head are constituteed, on, the low head adopts the ring flange to be connected with the jar body, at last, respectively place a double-deck flow distribution plate in low head neck department, also lay an in order to layer flow distribution plate in low head and jar body handing-over department, realize tertiary reposition of redundant personnel, the utility model discloses an inlet air current does not directly blow to the filter bed, be equipped with tertiary diverging device, the filter effect is better, but under long-time use, the easy pulverization of molecular sieve leads to blockking up the intake pipe, and the space that produces after the molecular sieve pulverization also can lead to air current distribution inhomogeneous, thereby cause the local overload of molecular sieve, reduce the molecular sieve utilization ratio.

Disclosure of Invention

The invention provides a molecular sieve circulating device of a PSA adsorption bed, aiming at overcoming the problems that in the prior art, molecular sieves in the adsorption bed are easy to pulverize, so that an air inlet pipeline is blocked, gaps are generated, and the utilization rate of the molecular sieves is influenced.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention relates to a molecular sieve circulating device of a PSA adsorption bed, which comprises a barrel, an air inlet end enclosure and an air outlet end enclosure, wherein the air inlet end enclosure and the air outlet end enclosure are arranged at two ends of the barrel and are respectively welded with ports at two ends of the barrel, an adsorption bed is arranged in the barrel, the adsorption bed is filled with a molecular sieve, an air inlet pipe is arranged on the air inlet end enclosure, an air outlet device is arranged on the air outlet end enclosure, the air outlet device comprises a jacket pipe and a compensation pressing device, one part of the jacket pipe is arranged in the barrel, the compensation pressing device is connected with the jacket pipe arranged outside the barrel, an air inlet membrane is arranged between the air inlet end enclosure and the barrel, an air outlet grid is arranged between the air outlet end enclosure and the barrel, a main vibrating rod in the vertical direction is arranged in the barrel, the main vibrating rod is arranged on a vibrating motor, a powder recovery channel is arranged at the inner bottom of the barrel, the air inlet membrane is funnel-shaped, and the powder recovery channel is communicated with the bottom of the air inlet membrane, and a sintering cavity is connected below the powder recovery channel.

After gas enters the cylinder body from the gas inlet pipe, the gas upwards passes through the adsorption bed, after the gas is used for a long time, a part of molecular sieves are pulverized to a certain degree, the pulverized molecular sieves fall onto the gas inlet diaphragm under the vibration action of the vibrating rod, the pulverized molecular sieves move downwards into the powder recovery channel in the shaking process due to the funnel-shaped shape of the gas inlet diaphragm, so that powder is prevented from being accumulated and blocking the gas inlet diaphragm, meanwhile, gaps among the molecular sieves tend to be uniform due to the vibration action of the vibrating rod, the nonuniform flowing of gas flow is avoided, after a period of time, the molecular sieves are continuously worn and consumed, the amount of the molecular sieves in the adsorption bed is gradually reduced, and the compensation compressing device can supplement the molecular sieves in the adsorption bed, so that insufficient adsorption is avoided; the sintering chamber can sinter the recovered molecular sieve, so that the pulverized molecular sieve is sintered into blocks again for recycling.

Preferably, a plurality of auxiliary vibrating rods in the horizontal direction and in contact with the main vibrating rod are arranged in the adsorption bed, a plurality of limiting rods are further arranged in the adsorption bed, limiting holes are formed in the limiting rods, two ends of each auxiliary vibrating rod are installed in the limiting holes, the inner diameter of each limiting hole is larger than the outer diameter of each auxiliary vibrating rod, and an elastic ring is installed in each limiting hole; the secondary vibrating rod can increase the contact area of the vibrating rod and the molecular sieve, so that the vibration efficiency is improved, the limiting rod and the limiting hole play a supporting role for the secondary vibrating rod, the secondary vibrating rod is enabled to carry out limited vibration at a fixed position, and the elastic ring can reduce the impact between the secondary vibrating rod and the limiting rod.

Preferably, the plurality of secondary vibrating rods are arranged at intervals in the vertical direction, and the projections of the secondary vibrating rods on the horizontal plane are radial with the primary vibrating rod as the center; the vertical arrangement of the adsorption bed at intervals can ensure that the positions with different heights in the adsorption bed can be subjected to stronger vibration; in addition, because the space in the cylinder is limited, a plurality of vibration motors cannot be arranged, and the power of a single vibration motor is limited, a large number of auxiliary vibration rods cannot be driven to vibrate, and the vibration efficiency can be improved through the radial distribution of the auxiliary vibration rods.

Preferably, the jacket sleeve is arranged in the center of the air outlet end socket and comprises an outer pipe and an inner pipe which are coaxial and equal in height, an air outlet channel is formed in a gap between the outer pipe and the inner pipe, the inner pipe is communicated with the adsorption bed, a flange is arranged at the port of the jacket sleeve arranged outside the cylinder body, and a corresponding matched flange cover is connected onto the flange; the air outlet channel can be separated from the inlet of the molecular sieve through the outer pipe and the inner pipe, so that the molecular sieve is sealed in the equipment when the equipment works, and pollution is avoided.

Preferably, the compensation compressing device comprises a compressing cylinder, a cylinder ejector rod and a piston, the compressing cylinder is arranged in the center of the flange cover, the piston is arranged in the inner pipe, the plane of the piston is vertical to the axis of the inner pipe, the outer edge of the piston is matched with the pipe diameter of the inner pipe, an ejector rod hole is formed in the flange cover, the cylinder ejector rod penetrates through the ejector rod hole in the flange cover to be connected with the piston, an air pressure balance hole is formed in the piston, and a section of the inner pipe communicated with the adsorption bed and the bottom surface of the piston form an adsorbent compensation cavity; when more gaps are generated among the molecular sieves in the adsorption bed, the piston can supplement the molecular sieves in the adsorbent compensation cavity into the adsorption bed and compress the molecular sieves in the adsorption bed, so that the amount of the gaps is reduced, and the full performance of adsorption is ensured.

Preferably, a pre-alarm switch and a limit alarm switch are further arranged on the pressing cylinder; the arrangement of the pre-alarm switch and the limit alarm switch enables a user to know the condition of the molecular sieve in the compensation cavity in time, and the adding work and the shutdown preparation are carried out in advance.

Preferably, a sintering cavity is connected below the powder recovery channel, a rotating blade is arranged in the sintering cavity, an air inlet and a discharge hole are respectively formed in two sides of the sintering cavity, the air inlet is communicated with the air inlet pipe, and a heating net is arranged at the connection position of the air inlet and the sintering cavity; the rotary blade can be used for beating the sintered molecular sieve into small blocks through rotation so as to be reused; the air inlet is communicated with the air inlet pipe, so that the sintering cavity can be directly heated by the entering gas, and the part of the gas can enter the adsorption bed through the powder recovery channel, thereby simplifying the structure of the equipment.

Therefore, the invention has the following beneficial effects: (1) the pulverized molecular sieve can be shaken off to a powder recovery channel through a vibrating rod, and the molecular sieve in the adsorption bed is supplemented in real time; the influence of the pulverized molecular sieve on the adsorption bed is avoided, and the uneven gap generated in the adsorption bed is reduced; (2) the powdered molecular sieve may be sintered again to recycle the molecular sieve.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention.

Fig. 2 is a schematic top view of the inside of the cartridge of the present invention.

In the figure: 1. the device comprises a cylinder body 2, an air inlet end enclosure 3, an air outlet end enclosure 4, an air inlet pipe 5, an outer pipe 6, an inner pipe 7, an air outlet channel 8, a port flange 9, a flange cover 10, an exhaust hole 11, an air outlet pipe 12, a pressing cylinder 13, a cylinder ejector rod 14, a piston 15, an adsorbent compensation cavity 16, a pre-alarm switch 17, a limit alarm switch 18, a discharge opening 19, an air outlet grid 20, an air inlet diaphragm 21, a drying layer 22, a main vibrating rod 23, a vibrating motor 24, a powder recovery channel 25, an isolation net 26, an auxiliary vibrating rod 27, a limiting rod 28, an elastic ring 29, a sintering cavity 30, a rotating blade 31, an air inlet 32, a discharge opening 33, a heating net 34 and an adsorption bed.

Detailed Description

The invention is further described with reference to the following figures and embodiments.

In the embodiment shown in fig. 1 and 2, a PSA adsorption bed molecular sieve circulation device comprises a cylinder 1, and an air inlet end enclosure 2 and an air outlet end enclosure 3 which are respectively welded to ports at two ends of the cylinder, wherein the air inlet end enclosure and the air outlet end enclosure are both elliptical end enclosures, an air inlet pipe 4 is welded to the air inlet end enclosure, the air outlet end enclosure is provided with an air outlet device, the PSA adsorption bed circulation device comprises a jacket pipe and a compensation pressing device, the jacket pipe is arranged in the center of the air outlet end enclosure, the jacket pipe comprises an outer pipe 5 and an inner pipe 6 which are coaxial and equal in height, a gap between the outer pipe and the inner pipe forms an air outlet channel 7, an adsorption bed 34 is arranged in the cylinder, the inner pipe is communicated with the adsorption bed, a port flange 8 is arranged at the port of the jacket pipe arranged outside the cylinder, an annular seal cover is arranged between the ports of the outer pipe and the inner pipe, and the flange is connected with a corresponding matched flange cover 9; the flange cover is provided with a push rod hole, the wall of an outer pipe arranged in the cylinder body is provided with four exhaust holes 10 which are uniformly distributed in the circumferential direction, the outer pipe arranged outside the cylinder body is provided with an exhaust pipe 11, the exhaust pipe is vertical to the axis of the outer pipe and is welded with the outer pipe, the port part of the exhaust pipe is welded with a flange, the total area of the exhaust holes is larger than the section area of the exhaust pipe, the compensation pressing device comprises a pressing cylinder 12, a cylinder push rod 13 and a piston 14, the pressing cylinder is arranged in the center of the flange cover, the piston is arranged in the inner pipe, the plane of the piston is vertical to the axis of the inner pipe, the outer edge of the piston is matched with the pipe diameter of the inner pipe, the cylinder push rod passes through the push rod hole on the flange cover to be connected with the piston, the piston is provided with an air pressure balance hole, a section of the inner pipe communicated with the adsorption bed and the bottom surface of the piston form an adsorbent compensation cavity 15, the compensation cavity is filled with a molecular sieve, the pre-alarm switch 16 and a limit alarm switch 17 are also arranged on the pressing cylinder, the cylinder body is further provided with a discharge opening 18, an air outlet grid 19 is arranged between the air outlet seal head and the cylinder body, the air outlet grid respectively comprises a pore plate, a metal net and a coconut pad, a plurality of uniformly distributed round holes are formed in the pore plate, the metal net is attached to the surface of the pore plate, the metal net faces to one side of the adsorption layer, the meshes of the metal net are smaller than the particle size of the molecular sieve, the coconut pad is laid on the surface of the metal net, an air inlet diaphragm 20 is arranged between the air inlet seal head and the cylinder body, the air inlet diaphragm can only allow gas to pass through, the pulverized molecular sieve cannot pass through, and a drying layer 21 is further arranged below the air inlet diaphragm; the cylinder is internally provided with a main vibrating rod 22 in the vertical direction, the main vibrating rod is arranged on a vibrating motor 23, the bottom in the cylinder is provided with a powder recovery channel 24, the air inlet diaphragm is funnel-shaped, the powder recovery channel is communicated with the bottom of the air inlet diaphragm, a separation net 25 is arranged between the powder recovery channel and an adsorption bed, a lump of molecular sieve cannot pass through the separation net, a pulverized molecular sieve can pass through the separation net, the adsorption bed is internally provided with a plurality of auxiliary vibrating rods 26 in the horizontal direction which are contacted with the main vibrating rod, five limiting rods 27 are also arranged in the adsorption bed and circumferentially and uniformly distributed by taking the main vibrating rod as the center, the limiting rods are provided with limiting holes, two ends of the auxiliary vibrating rods are arranged in the limiting holes, the inner diameter of the limiting holes is larger than the outer diameter of the auxiliary vibrating rods, and elastic rings 28 are arranged in the limiting holes, the five auxiliary vibrating rods are arranged at intervals in the vertical direction, the projections of the auxiliary vibrating rods on the horizontal plane are radial with the main vibrating rod as the center, and the included angle between every two adjacent auxiliary vibrating rods is 36 degrees; the lower part of the powder recovery channel is connected with a sintering cavity 29, a rotating blade 30 is arranged in the sintering cavity, an air inlet 31 and a discharge hole 32 are respectively arranged on two sides of the sintering cavity, the air inlet is communicated with the air inlet pipe, and a heating net 33 is arranged at the joint of the air inlet and the sintering cavity.

In the using process, gas enters the gas inlet end enclosure from the gas inlet pipe, the gas in the gas inlet end enclosure is dried by the drying layer and then enters the adsorption bed through the gas inlet membrane, and the gas leaves the adsorption bed from the gas outlet grid after being in full contact with the molecular sieve in the adsorption bed; in the adsorption process, the vibration motor drives the main vibration rod to vibrate, and the main vibration rod transmits vibration to the auxiliary vibration rod, so that the molecular sieves in the adsorption bed are sufficiently vibrated, and gaps among the molecular sieves in the adsorption bed are more uniform; meanwhile, the pulverized molecular sieve formed by gas impact can fall downwards into the powder recovery channel under the vibration effect, so that the amount of the molecular sieve in the adsorption bed is reduced, at the moment, the compaction cylinder can drive the piston to supplement the molecular sieve in the adsorbent compensation cavity into the adsorption bed, and compact the molecular sieve to reduce the gap between the molecular sieves; and the pulverized molecular sieve entering the powder recovery channel moves downwards into the sintering cavity, part of gas introduced from the gas inlet pipe is heated by the heating net to generate hot air in the sintering cavity, so that the pulverized molecular sieve is sintered into blocks, the molecular sieve is recycled, and gas flow in the sintering cavity moves upwards into the adsorption bed through the powder recovery channel to be adsorbed.

Claims

1. A PSA adsorption bed molecular sieve circulating device comprises a barrel, an air inlet end socket and an air outlet end socket which are arranged at two ends of the barrel and respectively welded with ports at two ends of the barrel, wherein an adsorption bed is arranged in the barrel, the adsorption bed is filled with a molecular sieve, and the PSA adsorption bed is characterized in that an air inlet pipe is arranged on the air inlet end socket, an air outlet device is arranged on the air outlet end socket, the air outlet device comprises a jacket pipe and a compensation pressing device, one part of the jacket pipe is arranged in the barrel, the compensation pressing device is connected with the jacket pipe arranged outside the barrel, an air inlet membrane is arranged between the air inlet end socket and the barrel, an air outlet grid is arranged between the air outlet end socket and the barrel, a main vibrating rod in the vertical direction is arranged in the barrel, the main vibrating rod is arranged on a vibrating motor, a powder recovery channel is arranged at the bottom in the barrel, and the air inlet membrane is funnel-shaped, the powder recovery channel is communicated with the bottom of the air inlet diaphragm, an isolation net is arranged between the powder recovery channel and the adsorption bed, the agglomerated molecular sieve cannot pass through the isolation net, the pulverized molecular sieve can pass through the isolation net, and a sintering cavity is connected below the powder recovery channel; the compensation compressing device comprises a compressing cylinder, a cylinder ejector rod and a piston, the compressing cylinder is arranged in the center of the flange cover, the piston is placed in the inner pipe, the plane of the piston is perpendicular to the axis of the inner pipe, the outer edge of the piston is matched with the pipe diameter of the inner pipe, the cylinder ejector rod penetrates through an ejector rod hole in the flange cover to be connected with the piston, an air pressure balance hole is formed in the piston, an adsorbent compensation cavity is formed between one section of the inner pipe communicated with the adsorption bed and the bottom surface of the piston, and a molecular sieve is filled in the compensation cavity.

2. The molecular sieve circulation device of the PSA adsorption bed as claimed in claim 1, wherein a plurality of horizontal secondary vibrating rods are arranged in the adsorption bed, which are in contact with the primary vibrating rods, a plurality of limiting rods are arranged in the adsorption bed, limiting holes are arranged on the limiting rods, two ends of the secondary vibrating rods are arranged in the limiting holes, the inner diameter of the limiting holes is larger than the outer diameter of the secondary vibrating rods, and elastic rings are arranged in the limiting holes.

3. The molecular sieve circulation device of the PSA adsorption bed as recited in claim 2, wherein a plurality of the secondary vibration rods are arranged at intervals in the vertical direction, and the projections of the secondary vibration rods on the horizontal plane are radial with the primary vibration rod as the center.

4. The molecular sieve circulation device of the PSA adsorption bed according to claim 1, wherein the jacket pipe is arranged in the center of the gas outlet seal head, the jacket pipe comprises an outer pipe and an inner pipe which are coaxial and equal in height, a gap between the outer pipe and the inner pipe forms a gas outlet channel, the inner pipe is communicated with the adsorption bed, a flange is arranged at the port of the jacket pipe arranged outside the cylinder body, and a corresponding matched flange cover is connected to the flange.

5. The molecular sieve circulation device of the PSA adsorption bed as recited in claim 1, wherein the compacting cylinder is further provided with a pre-alarm switch and a limit alarm switch.

6. The molecular sieve circulation device of the PSA adsorption bed as claimed in any one of claims 1 to 5, wherein the sintering chamber is internally provided with a rotary blade, the two sides of the sintering chamber are respectively provided with an air inlet and a discharge outlet, the air inlet is communicated with the air inlet pipe, and the joint of the air inlet and the sintering chamber is provided with a heating net.