Lead screw pressing adsorption tower structure

Abstract

The utility model provides a lead screw pressing adsorption tower structure, and mainly relates to the technical field of pressure swing adsorption equipment. The lead screw pressing adsorption tower structure comprises an adsorption tower barrel, an upper cover, a cylinder body and a lead screw pressing module, the upper cover is fixedly installed on the adsorption tower barrel, a molecular sieve is installed in the adsorption tower barrel, a sieve plate, a stainless steel wire mesh pad and a pressing plate are sequentially placed on the molecular sieve, the cylinder body is installed in the middle of the upper cover through a thread structure, and the lead screw pressing module is installed on the cylinder body. A pressing sealing pad is arranged between the cylinder body and the upper cover, and a lead screw pressing module is installed in the cylinder body. The application field of the utility model is not limited to molecular sieve compaction in the fields of oxygen production, nitrogen production, hydrogen production and the like; according to the scheme, the cost is low, pressing can be conducted again from the outside without disassembling the upper cover, and operation is convenient; the piston rod adopts an up-and-down double-sealing structure and has good air tightness, and the problem of failure of the molecular sieve is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to pressure swing adsorption equipment technical field, specifically a screw rod pressure tight adsorption tower structure. BACKGROUND

[0002] Pressure swing adsorption oxygen production and pressure swing adsorption nitrogen production technology is adopting specific molecular sieve can be under different pressure to gas adsorption and analysis characteristics, through changing the tower pressure mode of filling with specific molecular sieve adsorption tower realizes the separation of oxygen and nitrogen in air.

[0003] As the core technology in the field of gas separation, pressure swing adsorption technology is widely used in normal temperature air oxygen production / nitrogen production, hydrogen purification, industrial tail gas purification and gas drying, etc., and its core relies on the selective adsorption and analysis characteristics of molecular sieve under different pressures to realize the separation of mixed gas. In the pressure swing adsorption equipment, the compaction stability of the granular molecular sieve directly determines the operation efficiency and service life of the equipment. Since there are natural gaps between the molecular sieve particles, it is difficult to achieve absolute compaction during the filling process, and periodic airflow impact during equipment operation will cause the molecular sieve to gradually sink, forming empty space at the upper part of the adsorption tower, which further causes the displacement and collision of the molecular sieve under airflow impact, and finally leads to the pulverization failure of the molecular sieve.

[0004] The existing screw rod type compaction structure has three major core pain points: first, the compaction force adjustment precision is low, the traditional screw rod usually adopts ordinary triangular thread, and long-term operation is prone to looseness due to vibration, the compaction force decays quickly (the decay amount is more than 2.5MPa after 1000h of operation), and the molecular sieve pulverization rate is as high as more than 4%; second, the sealing performance is insufficient, the piston rod usually adopts single sealing ring design, and long-term sliding is prone to gas leakage or intrusion of external impurities, which damages the adsorption activity of the molecular sieve; third, the anti-loose structure is imperfect, lacks reliable circumferential limiting components, the screw rod is prone to reverse loosening due to equipment vibration, which causes frequent pressure compensation, and the pressure compensation needs to repeatedly disassemble the protective components, which is complicated to operate; in addition, the elastic of the stainless steel wire mesh pad of some structures is poor (the rebound rate is less than or equal to 70%), which cannot effectively compensate the sinking space of the molecular sieve, further increasing the risk of molecular sieve failure. In summary, the existing screw rod compaction structure has deficiencies in compaction stability, sealing reliability, anti-loose effect and operation convenience, and there is an urgent need for a screw rod compaction adsorption tower structure with optimized structure and stable performance. UTILITY MODEL CONTENTS

[0005] To solve the deficiencies of the prior art, the utility model provides a screw rod compaction adsorption tower structure, which can realize the recompaction of the molecular sieve outside through the screw rod compaction module, is convenient and fast to operate, has good sealing effect in structure design, and can effectively avoid the failure of the molecular sieve.

[0006] The utility model discloses a screw rod compaction adsorption tower structure which can realize the recompaction of the molecular sieve outside through the screw rod compaction module, is convenient and fast to operate, has good sealing effect in structure design, and can effectively avoid the failure of the molecular sieve.

[0007] A screw rod compression adsorption tower structure, comprising an adsorption tower barrel, an upper cover, a cylinder body, a screw rod compression module, the upper cover is fixedly installed on the adsorption tower barrel, a molecular sieve is installed in the adsorption tower barrel, a sieve plate, a stainless steel wire mesh pad and a pressing plate are sequentially placed on the molecular sieve, a cylinder body is installed in the middle of the upper cover through a threaded structure, a compression sealing gasket is arranged between the cylinder body and the upper cover, and a screw rod compression module is installed in the cylinder body.

[0008] The screw rod compression module comprises a screw rod, a piston rod and a fixing bolt, the screw rod is installed in the cylinder body through a threaded structure, a lever is installed on the upper portion of the screw rod, a piston sealing ring is installed on the upper portion of the piston rod, a fixing bolt is installed on the top of the piston rod through a threaded structure, the fixing bolt compresses and fixes the piston sealing ring on the piston rod, the upper portion of the piston rod is slidably connected to the cylinder body through the piston sealing ring, the lower end of the screw rod abuts against and slidably contacts the fixing bolt, and a screw sleeve is installed at the lower end of the cylinder body through a threaded structure.

[0009] A barrel flange is fixedly arranged on the outer side of the upper portion of the adsorption tower barrel, a plurality of bolt assemblies are installed on the barrel flange and the upper cover, the upper cover is fixedly installed on the adsorption tower barrel through the bolt assemblies, and a flange sealing gasket is arranged between the upper cover and the barrel flange.

[0010] The bolt assembly comprises a hexagonal bolt, a flat washer, an elastic washer and a hexagonal nut, the hexagonal bolt penetrates the bolt hole of the upper cover and the bolt hole of the barrel flange in sequence, and is then sleeved with the flat washer and the elastic washer in sequence and finally screwed with the hexagonal nut.

[0011] The outer side of the stainless steel wire mesh pad is tightly attached to the inner wall of the adsorption tower barrel without any gap.

[0012] A plurality of threaded holes are uniformly formed in the upper portion of the cylinder body in the circumferential direction, an internal hexagonal set screw is adaptively installed in the threaded hole, a plunger is fixed to the end of the internal hexagonal set screw close to the screw rod, and the end face of the plunger is tightly abutted against the outer side wall of the screw rod, so as to limit the circumferential rotation of the screw rod.

[0013] Compared with the prior art, the screw rod compression adsorption tower structure has the following beneficial effects:

[0014] Strong compression stability, prolonging the service life of molecular sieve: the present application adopts trapezoidal thread (Tr40x6) screw rod matched with cylinder, the trapezoidal thread has strong bearing capacity and better anti-loosening effect than ordinary triangular thread, and the circumferential limiting structure of the inner hexagonal set screw and the polytetrafluoroethylene plunger can effectively avoid the vibration and loosening of the screw rod, the compression force attenuation is less than or equal to 0.4MPa after 1000h of operation, which is much lower than that of the traditional screw structure (2.5MPa); the resilience rate of the elastic stainless steel wire mesh pad is greater than or equal to 85%, which can automatically compensate the empty space formed by the sinking of the molecular sieve, avoid displacement and collision of the molecular sieve, and the actual working condition verification shows that the pulverization rate of the molecular sieve is only 0.7%, the service life is prolonged to more than 3 years, which is more than 50% higher than that of the traditional structure.

[0015] Double sealing design, guaranteeing air tightness and cleanliness: the piston rod adopts upper and lower double sealing structure of "piston sealing ring + screw sealing ring", the piston sealing ring forms high-precision sliding sealing with the inner wall of the cylinder, and the screw sealing ring further blocks the leakage channel, effectively avoiding gas leakage or external dust and water vapor from entering the adsorption tower; at the same time, the compression sealing pad between the cylinder and the upper cover adopts oil-resistant rubber material with a hardness of 70-80 degrees, which ensures the overall air tightness of the adsorption tower, and the leakage amount of the adsorption tower during operation is less than or equal to 0.02MPa / h, which guarantees that the adsorption performance of the molecular sieve is not affected.

[0016] Convenient operation, reducing operation and maintenance cost: the screw rod compression module is integrated in the cylinder, without disassembling the upper cover, and only by rotating the external wrench, the secondary pressure compensation can be realized, and the quick limiting of the inner hexagonal set screw, the single pressure compensation time is only 10min, which is much higher than that of the traditional structure (more than 40min for single pressure compensation after disassembling the upper cover and adjusting the parts), greatly improving the operation and maintenance efficiency; and the screw rod and the wrench can be detachably connected, which is convenient for later maintenance and replacement, further reducing the operation and maintenance cost.

[0017] Wide structural adaptability, multiple application scenarios: the cylinder of the structure is detachably installed through threads, the adjustment stroke of the screw rod reaches 50-80mm, and it can be adapted to adsorption towers with different specifications of φ600-φ1000mm; the compression force adjustment range is 8-14MPa, which is not only suitable for conventional oxygen and nitrogen production scenes, but also can meet the gas purification demand under high pressure (inlet pressure 0.8-1.0MPa) in the fields of chemical industry and medicine, and the application range is significantly widened. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall structure schematic diagram of the present application.

[0019] The reference signs shown in the drawings: 1, molecular sieve; 2, sieve plate; 3, stainless steel wire mesh pad; 4, pressing plate; 5, barrel flange; 6, flange sealing gasket; 7, upper cover; 8, piston rod; 9, compression sealing gasket; 10, cylinder body; 11, winding lever; 12, screw rod; 13, fixing bolt; 14, piston sealing ring; 15, screw sleeve sealing ring; 16, screw sleeve; 17, hexagonal bolt; 18, flat washer; 19, spring washer; 20, nut; 21, adsorption tower barrel; 22, inner hexagonal set screw. DETAILED DESCRIPTION

[0020] The utility model will be further explained in connection with the drawings and specific embodiments. It should be understood that these embodiments are only used for explaining the utility model and are not used for limiting the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the present application.

[0021] In connection with the drawings and specific embodiments, Figure 1 A screw rod compression adsorption tower structure, including adsorption tower barrel 21, upper cover 7, cylinder body 10, screw rod compression module, the upper cover 7 is fixedly installed on adsorption tower barrel 21, the molecular sieve 1 is installed in adsorption tower barrel 21, the sieve plate 2, stainless steel wire mesh pad 3 and pressing plate 4 are placed in sequence on the molecular sieve 1, the cylinder body 10 is installed in the middle part of the upper cover 7 by thread structure, the cylinder body 10 is equipped with compression sealing gasket 9 between the upper cover 7, the cylinder body 10 is installed with screw rod compression module;

[0022] The screw rod compression module includes screw rod 12, piston rod 8, fixing bolt 13, the screw rod 12 is installed in the cylinder body 10 by thread structure, the winding lever 11 is installed on the upper portion of the screw rod 12, the piston sealing ring 14 is installed on the upper portion of the piston rod 8, the fixing bolt 13 is installed on the top of the piston rod 8 by thread, the fixing bolt 13 compresses and fixes the piston sealing ring 14 on the piston rod 8, the piston rod 8 is slidably connected in the cylinder body 10 by the piston sealing ring 14, the lower end of the screw rod 12 is abutted on the fixing bolt 13 and slidably contacted with it, the cylinder body 10 is installed with screw sleeve 16 by thread structure, the screw sleeve sealing ring 15 is installed between the screw sleeve 16 and the cylinder body 10, the screw sleeve sealing ring 15 is slidably contacted with the piston rod 8 on the inside. The piston sealing ring 14 also has the effect of connecting and sealing the piston rod 8 and the cylinder body 10;The screw sleeve sealing ring 15 is used for the sliding connection and sealing effect between the cylinder body 10 and the piston rod 8;The screw sleeve 16 has a recess in the inside and can limit the piston rod 8.

[0023] The outer upper portion of the adsorption tower cylinder 21 is fixedly provided with a cylinder flange 5, a plurality of bolt assemblies are installed on the cylinder flange 5 and the upper cover 7, the upper cover 7 is fixedly installed on the adsorption tower cylinder 21 through the bolt assemblies, and a flange sealing gasket 6 is arranged between the upper cover 7 and the cylinder flange 5. The cylinder flange 5 is welded to the outer side of the adsorption tower cylinder 21.

[0024] The bolt assembly comprises a hexagonal bolt 17 of a strength grade of 8.8, a flat washer 18 with a thickness of 4-6 mm, an elastic washer 19 with an elastic coefficient of 1.5-2.0 N / mm, and a hexagonal nut 20. The hexagonal bolt 17 penetrates the bolt holes of the upper cover 7 and the cylinder flange 5 in sequence, and is then sleeved with the flat washer 18 and the elastic washer 19 in sequence, and finally is screwed and fixed with the hexagonal nut 20. The locking nut 20 is rotated to lock the installation position of the upper cover 7 on the adsorption tower cylinder 21.

[0025] The stainless steel wire mesh pad 3 is made of 304 stainless steel material, adopts a double-layer woven structure, has a mesh number of 80-100, is elastic, has a resilience rate of ≥85% when the compression amount is 5-10 mm, and is tightly attached to the inner wall of the adsorption tower cylinder 21 without gap on the outer side, so as to prevent material from running off.

[0026] A plurality of threaded holes are uniformly arranged in the circumferential direction of the upper portion of the cylinder body 10, and an internal hexagonal set screw 22 is adaptively installed in the threaded hole. A plunger made of polytetrafluoroethylene is fixed to one end of the internal hexagonal set screw 22 close to the screw rod 12. The end surface of the plunger is tightly abutted against the outer side wall of the screw rod 12, and is used to limit the circumferential rotation of the screw rod 12.

[0027] In use, the piston rod 8 is adjusted to the required height, and is pressed against the pressing plate 4. The hexagonal nut 20, the elastic washer 19, the flat washer 18, and the hexagonal bolt 17 are fastened, and the stainless steel wire mesh pad 3 is compressed once under the bolt force of the hexagonal bolt 17. After the upper cover 7 is fastened, the lever 11 is rotated, the screw rod 12 is lowered under the action of the lever force, the piston rod 8 is pushed downward, and the stainless steel wire mesh pad 3 is compressed again. When the compression is completed, the internal hexagonal set screw 22 is rotated to the bottom, and the plunger is pressed against the screw rod 12 to prevent loosening.

[0028] Example 1

[0029]

[0030] Note:

[0031] 1. Example 1 working condition: used for nitrogen production in the chemical industry (inlet pressure 0.9 MPa, adsorption cycle 120 s, and environmental temperature 5-40℃);

[0032] 2. The pulverization rate detection method: take 100 g of molecular sieve sample from the bottom of the adsorption tower, pass through a 100 mesh standard sieve, and weigh the mass ratio of the powder under the sieve;

[0033] 3. The air leakage amount detection method: pressurize the adsorption tower to 1.0 MPa, close the inlet valve, and record the pressure drop value after 1 h of standing.

[0034] According to the above specific implementation condition data comparison table, under the same adsorption tower specifications (φ800x2500mm, molecular sieve loading amount 1.2 m 3 ) and chemical industry nitrogen production conditions (inlet pressure 0.9 MPa, adsorption cycle 120 s, and ambient temperature 5-40℃), the screw rod compression adsorption tower structure of the present application has significant advantages in core performance, operation and maintenance efficiency, and operation stability compared to the traditional screw rod compression structure and the traditional mechanical compression structure. The specific advantages can be reflected in the following dimensions:

[0035] In terms of compression force stability and molecular sieve protection, the initial compression force of the present application is 12 MPa, and relying on the trapezoidal thread anti-loose design and the polytetrafluoroethylene plunger limiting structure, the compression force attenuation is only ≤0.4 MPa after 1000 h of operation, which is much better than the attenuation level of 2.5 MPa for the traditional screw rod compression structure and 3.2 MPa for the traditional mechanical compression structure, effectively avoiding the displacement collision of the molecular sieve caused by insufficient compression force. Actual detection shows that the pulverization rate of the molecular sieve of the present application is only 0.7%, and the service life is extended to ≥3 years, which is significantly optimized compared to the traditional screw rod compression structure (pulverization rate 4.1%, service life 2 years) and the traditional mechanical compression structure (pulverization rate 5.2%, service life 1.5 years), significantly reducing the molecular sieve replacement cost and equipment downtime frequency.

[0036] In terms of operation and maintenance efficiency, the present application does not need to disassemble the upper cover, and only needs to complete the pressure compensation operation through the external wrench, combined with the rapid limiting of the internal hexagonal set screw, the single maintenance time is only 10 min, and the maintenance frequency is reduced to once every 6 months; compared to the traditional screw rod compression structure (single maintenance time 25 min, pressure compensation once every 2 months) and the traditional mechanical compression structure (single maintenance time 90 min, pressure compensation every month + cover inspection every 3 months), not only reduces the labor input, but also avoids the damage to the sealing performance of the adsorption tower caused by frequent cover opening, which can reduce the equipment downtime maintenance time by more than 10 h per year, and greatly improves the production continuity.

[0037] In the running stability and air tightness dimension, the application controls the air leakage amount during the operation of the adsorption tower to be less than or equal to 0.02 MPa / h through the double sealing design of the "piston sealing ring + screw sealing ring", which is much lower than the air leakage level of the traditional screw rod compression structure 0.15 MPa / h and the traditional mechanical compression structure 0.2 MPa / h, effectively guarantees the stable pressure in the adsorption tower, ensures that the purity (99.9%) of the pressure swing adsorption nitrogen is continuously operated with a fluctuation of less than or equal to 0.05%, which is better than the purity stability performance of the two types of traditional structures, and meets the strict requirements of the chemical industry on gas purity.

[0038] In summary, through the integrated structural design of "high-precision screw rod transmission + double sealing + elastic compensation + reliable anti-loose", the application accurately solves the pain points of the traditional compression structure, such as fast compression force decay, complicated operation and maintenance, poor air tightness, etc., provides reliable structural support for the efficient, stable and low-cost operation of the pressure swing adsorption equipment, and is especially suitable for the chemical, pharmaceutical and other fields with high requirements on running stability and maintenance efficiency.

[0039] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A screw compression adsorption column structure, comprising an adsorption column cylinder (21), an upper cover (7), a cylinder body (10), a screw compression module, characterized in that: The upper cover (7) is fixedly installed on the adsorption tower barrel (21), the molecular sieve (1) is installed in the adsorption tower barrel (21), the sieve plate (2), the stainless steel wire mesh pad (3) and the pressing plate (4) are sequentially placed on the molecular sieve (1), the cylinder body (10) is installed in the middle of the upper cover (7) through the threaded structure, the compression sealing gasket (9) is arranged between the cylinder body (10) and the upper cover (7), and the screw rod compression module is installed in the cylinder body (10). The screw rod compression module comprises a screw rod (12), a piston rod (8) and a fixed bolt (13), the screw rod (12) is installed in the cylinder body (10) through the threaded structure, the screw rod (12) is provided with the lever (11) on the upper portion, the piston rod (8) is provided with the piston sealing ring (14) on the upper portion, the fixed bolt (13) is installed on the top of the piston rod (8) through the thread, the piston sealing ring (14) is compressed and fixed on the piston rod (8) by the fixed bolt (13), the piston rod (8) is slidably connected to the cylinder body (10) through the piston sealing ring (14), the lower end of the screw rod (12) abuts against the fixed bolt (13) and is in sliding contact with the fixed bolt (13), the cylinder body (10) is provided with the screw sleeve (16) at the lower end through the threaded structure, the screw sleeve (16) is provided with the screw sleeve sealing ring (15) between the cylinder body (10), and the screw sleeve sealing ring (15) is in sliding contact with the piston rod (8) on the inner side.

2. A structure of a siltight adsorption tower according to claim 1, wherein: The barrel flange (5) is fixedly arranged on the outer side of the upper portion of the adsorption tower barrel (21), a plurality of bolt assemblies are installed on the upper cover (7) and the barrel flange (5), the upper cover (7) is fixedly installed on the adsorption tower barrel (21) through the bolt assemblies, and the flange sealing gasket (6) is arranged between the upper cover (7) and the barrel flange (5).

3. A structure of a sintered rod compression adsorption tower according to claim 2, characterized in that: The bolt assembly comprises a hexagonal bolt (17), a flat washer (18), an elastic washer (19) and a hexagonal nut (20), the hexagonal bolt (17) penetrates the bolt holes of the upper cover (7) and the barrel flange (5) in sequence, and is provided with the flat washer (18) and the elastic washer (19) in sequence after being threaded out, and is finally screwed and fixed with the hexagonal nut (20).

4. The structure of a siltight adsorption tower according to claim 1, wherein: The outer side of the stainless steel wire mesh pad (3) is closely attached to the inner wall of the adsorption tower barrel (21) without gap.

5. The structure of a siltight adsorption tower according to claim 1, wherein: A plurality of threaded holes are uniformly formed in the upper portion of the cylinder body (10) in the circumferential direction, the internal hexagonal locking screw (22) is adaptively installed in the threaded hole, the plunger is fixed to one end of the internal hexagonal locking screw (22) close to the screw rod (12), the end face of the plunger is closely abutted against the outer side wall of the screw rod (12), and the circumferential rotation of the screw rod (12) is limited.

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