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CN-121016397-B - Oxygen separation device for pressure swing adsorption system

CN121016397BCN 121016397 BCN121016397 BCN 121016397BCN-121016397-B

Abstract

The invention discloses an oxygen separation device for a pressure swing adsorption system, and relates to the technical field of oxygen separation. The oxygen separation device for the pressure swing adsorption system comprises an oxygen separation tank, a central shaft, a zeolite molecular sieve, an upper transposition mechanism and a lower transposition mechanism, wherein the central shaft is arranged in the oxygen separation tank along the axial direction of the oxygen separation tank and can rotate around the axis of the central shaft, the zeolite molecular sieve is sleeved outside the central shaft and is uniformly distributed along the axial direction of the central shaft, and the upper transposition mechanism and the lower transposition mechanism are arranged on the zeolite molecular sieve and can synchronously act along with the rotation of the central shaft and are used for driving zeolite particles to alternate in position in the axial direction. By arranging the upper and lower transposition mechanisms which synchronously act with the rotary drum, the zeolite particles are driven to continuously and orderly alternate in position in the axial direction, so that dynamic cyclic replacement of the adsorption areas is realized, the zeolite particles at different positions participate in the adsorption process alternately, the loads of all areas are effectively balanced, and local premature failure is prevented.

Inventors

  • LIU ZHENGKAI

Assignees

  • 威凯瑞能源装备科技(山东)有限公司

Dates

Publication Date
20260508
Application Date
20250911

Claims (6)

  1. 1. Oxygen separation device for pressure swing adsorption system, characterized by comprising: an oxygen separation tank (1); A central shaft (13), wherein the central shaft (13) is arranged inside the oxygen separation tank (1) along the axial direction of the oxygen separation tank and can rotate around the axis of the central shaft; The zeolite molecular sieves (14) are sleeved outside the central shaft (13) and are uniformly distributed along the axial direction of the central shaft (13), and zeolite particles are arranged between the upper and lower adjacent zeolite molecular sieves (14) and are used for selectively adsorbing nitrogen components in the air; The upper and lower transposition mechanisms (17) are arranged on the zeolite molecular sieve (14) and can synchronously act along with the rotation of the central shaft (13) so as to drive zeolite particles to alternate in position in the axial direction; the upper and lower transposition mechanism (17) comprises a plurality of mounting grooves (171) which are uniformly distributed along the circumferential direction of the zeolite molecular sieve (14), an annular outer shaft (172) which penetrates through the mounting grooves (171) is arranged in the zeolite molecular sieve (14), a rotating inner shaft (174) is rotatably arranged in the mounting grooves (171), a circulating moving belt (173) is connected between the annular outer shaft (172) and the rotating inner shaft (174), and uniform ventilation holes are formed in the circulating moving belt (173); The circulating moving belt (173) is provided with evenly distributed sliding grooves, molecular sieve sliding blocks (175) are arranged in the sliding grooves in a sliding mode, guide frames (176) used for limiting the movement paths of the molecular sieve sliding blocks (175) are arranged on the zeolite molecular sieves (14), and the molecular sieve sliding blocks (175) located on the descending side of the circulating moving belt (173) move towards the middle part, and the molecular sieve sliding blocks (175) located on the ascending side move towards the two side parts.
  2. 2. The oxygen separation device for a pressure swing adsorption system according to claim 1, wherein the inner wall of the rotary inner shaft (174) is provided with a skewed tooth groove (177), a rotary toothed ring (178) positioned in the rotary inner shaft (174) is rotatably installed in the zeolite molecular sieve (14), mating teeth (179) meshed with the skewed tooth groove (177) are installed at the upper end of the rotary toothed ring (178), a transmission gear (180) rotationally connected with the zeolite molecular sieve (14) is meshed with the inner side of the rotary toothed ring (178), and a central gear (181) meshed with the transmission gear (180) is fixedly sleeved on the outer side of the central shaft (13).
  3. 3. Oxygen separation device for pressure swing adsorption system according to claim 1 or 2, characterized in that a plurality of drums (11) are arranged in the oxygen separation tank (1), each drum (11) is coaxially arranged from top to bottom and the diameters of the drums are sequentially reduced, and the drums (11) are rotatably connected with the inner wall of the oxygen separation tank (1); The sizes of zeolite particles in each rotary drum (11) from top to bottom are sequentially increased to form a gradient particle distribution structure.
  4. 4. An oxygen separation device for a pressure swing adsorption system according to claim 3, wherein a support column (15) is connected between the zeolite molecular sieves (14) adjacent to each other vertically, and a fixed column (16) fixedly connected with the oxygen separation tank (1) is installed on each of the zeolite molecular sieves (14) positioned at the uppermost side and the lowermost side; the circumferentially distributed fixed columns (16) are connected to the same transition ring (19) together, a rotating frame (191) which is rotationally connected with the transition ring (19) is fixedly sleeved at the end part of the central shaft (13), a transition gear (192) is rotationally arranged in the transition ring (19), an outer tooth ring (193) which is meshed with the transition gear (192) is sleeved outside the rotating frame (191), and an inner tooth ring (194) which is meshed with the transition gear (192) is fixedly arranged on the inner wall of the rotating drum (11); The connecting toothed ring (195) is fixedly sleeved on the outer side of the rotary drum (11) in the middle, a rotating gear (196) is meshed with the outer side of the connecting toothed ring (195), and the rotating gear (196) is connected with an output shaft of the driving motor (197).
  5. 5. The oxygen separation device for pressure swing adsorption system according to claim 4, wherein the oxygen separation tank (1) has an oxygen outlet at its upper end and an air inlet at its lower end; An air inlet ring (12) fixedly connected with the corresponding rotary drum (11) is arranged in the air inlet, a lifting circular plate (121) is arranged in the air inlet ring (12), air outlet pipes (124) which are uniformly distributed are arranged on the lifting circular plate (121), bases (125) fixedly connected with the lifting circular plate (121) are arranged on two sides of each air outlet pipe (124) except for the air outlet pipe (124) positioned at the central position, the air outlet pipes (124) are hinged with the corresponding bases (125) through pin shafts, the pin shafts are in up-down sliding fit with the bases (125), a cross rod is connected between the inner base and the outer base (125), and a pull rod (126) hinged with the air inlet ring (12) is hinged on the pin shaft positioned at the outermost side; Spiral grooves (122) connected end to end are formed in the inner ring surface of the air inlet ring (12), and sliding columns (123) in sliding fit with the spiral grooves (122) are arranged on the outer side of the lifting circular plate (121).
  6. 6. The oxygen separation device for a pressure swing adsorption system according to claim 4, wherein the outer side of the rotary drum (11) is provided with evenly distributed protruding blocks (198), and the inner wall of the oxygen separation tank (1) is provided with grooves (199) which are evenly distributed and matched with the protruding blocks (198).

Description

Oxygen separation device for pressure swing adsorption system Technical Field The invention relates to the technical field of oxygen separation, in particular to an oxygen separation device for a pressure swing adsorption system. Background The pressure swing adsorption system is a physical separation technology based on selective adsorption of gas on the surface of a porous adsorbent, and can realize high-efficiency separation of different components in air by periodically changing pressure, and is widely applied to the fields of industrial gas separation (such as oxygen production), natural gas purification and the like. In the oxygen production application, the preferential adsorption characteristic of the zeolite molecular sieve on nitrogen can be utilized, the nitrogen is adsorbed when the zeolite molecular sieve is pressurized, the oxygen is collected as unadsorbed gas, the nitrogen is desorbed when the zeolite molecular sieve is depressurized, and the adsorbent is regenerated, so that the continuous separation and purification of the oxygen are realized. However, the conventional oxygen separation device has the following problems: 1. most pressure swing adsorption oxygen separation devices adopt a single fixed structure, zeolite molecular sieves are filled in adsorption towers with the same size, particle size distribution of particles is uniform and the positions are fixed, the structure is simple and easy to operate, but has the obvious defects that compressed air is easy to form laminar flow or bias flow after entering, particularly, air flow concentrated impact frequently occurs in a bottom inlet area, so that local adsorption overload is caused, the utilization rate of high-position particles is low, unbalanced adsorption phenomenon of front end saturation and rear end idle is formed, and meanwhile, because zeolite particles are static, hardening or channeling easily occurs during long-term operation, mass transfer efficiency is reduced, pressure drop is increased, and oxygen purity and system stability are influenced. 2. In addition, although a part of improved structure is introduced into a rotary design to improve air flow distribution, under the influence of centrifugal force in operation, zeolite particles are easy to gather to the periphery, so that particles in a central area are loose and even form a cavity to cause air flow short circuit, meanwhile, air flow is easy to form vortex or circumferential shearing in a rotary field to cause air flow distribution disorder, air flow and particles are unevenly contacted, and the particles are in a biased state for a long time, so that the problems of local premature saturation and low overall utilization rate still exist. Disclosure of Invention Aiming at the defects of the prior art, the invention provides an oxygen separation device for a pressure swing adsorption system, and solves the problems in the background art. The oxygen separation device for the pressure swing adsorption system comprises an oxygen separation tank, a central shaft, zeolite molecular sieves, an upper transposition mechanism and a lower transposition mechanism, wherein the central shaft is arranged in the oxygen separation tank along the axial direction of the oxygen separation tank and can rotate around the axis of the central shaft, the zeolite molecular sieves are sleeved outside the central shaft and are uniformly distributed along the axial direction of the central shaft, zeolite particles are arranged between the upper and lower adjacent zeolite molecular sieves and are used for selectively adsorbing nitrogen components in air, and the upper transposition mechanism and the lower transposition mechanism are arranged on the zeolite molecular sieves and can synchronously act along with the rotation of the central shaft and are used for driving the zeolite particles to alternate in position along the axial direction. Further, the up-down transposition mechanism comprises a plurality of mounting grooves which are uniformly distributed along the circumferential direction of the zeolite molecular sieve, an annular outer shaft which penetrates through the mounting grooves is arranged in the zeolite molecular sieve, a rotating inner shaft is rotatably arranged in the mounting grooves, a circulating moving belt is connected between the annular outer shaft and the rotating inner shaft, and uniform vent holes are formed in the circulating moving belt. Further, evenly distributed sliding grooves are formed in the circulating moving belt, molecular sieve sliding blocks are arranged in the sliding grooves in a sliding mode, guide frames used for limiting the movement paths of the molecular sieve sliding blocks are arranged on the zeolite molecular sieves, the molecular sieve sliding blocks located on the descending side of the circulating moving belt move towards the middle part, and the molecular sieve sliding blocks located on the ascending side move towards the two side parts