A membrane oxygen-enriched oxygen production system and process

Abstract

A membrane oxygen enrichment oxygen production system and process, the oxygen production system comprises a first frame and a second frame; an air filter is arranged on the top of the first frame, a centrifugal fan is arranged on the bottom, and the outlet of the air filter is connected to the inlet of the centrifugal fan through a first pipeline; a roll-type membrane assembly box is arranged on the top of the second frame, and a Roots vacuum unit is arranged on the bottom; the air outlet on the top of the roll-type membrane assembly box is connected to the inlet of the Roots vacuum unit through a second pipeline; a steam-water separation device is arranged between the first frame and the second frame, and the air inlet of the steam-water separation device is connected to the outlet of the centrifugal fan through a third pipeline; the air outlet of the steam-water separation device is connected to the air inlet of the roll-type membrane assembly box through a fourth pipeline; an air storage tank is arranged outside the second frame, and the inlet of the air storage tank is connected to the outlet of the Roots vacuum unit through a fifth pipeline. The oxygen production process comprises the following steps: natural air is purified and enriched and oxygenated through the air filter, the steam-water separator, and the roll-type membrane assembly box, and then sent to the air storage tank.

Description

Technical Field

[0001] The invention belongs to the technical field of oxygen-enriched manufacturing, and in particular to a membrane-based oxygen-enriched oxygen production system and process. Background Art

[0002] my country has actively carried out research on oxygen-enriched combustion technology and has achieved many significant results. At present, there are three main methods for producing oxygen-enriched air: cryogenic method, pressure swing adsorption separation method, and membrane separation method. The principle of membrane oxygen production is to use the different rates of different gas molecules passing through the selective polymer separation membrane. Driven by the pressure difference, the oxygen molecules in the air pass through the separation membrane faster to obtain oxygen-enriched air. Generally, the pressure difference on both sides of the oxygen-enriched membrane is maintained by a fan and a vacuum pump. The fan transports the natural air after dust removal to the high-pressure side surface of the membrane of the oxygen-enriched membrane assembly. The vacuum pump is used to reduce the pressure to a certain pressure on the low-pressure side of the oxygen-enriched membrane assembly. The permeated gas discharged by the vacuum pump is oxygen-enriched air. The non-permeated gas (i.e., nitrogen-enriched air) discharged from the oxygen-enriched membrane assembly is directly released into the atmosphere. In order to ensure the normal operation of the roll membrane assembly, it is necessary to remove the excess gaseous moisture in the air. A gas-water separator refers to a device that uses a physical structure to separate the water suspended in the gas. The separated liquid water generally gathers at the bottom of the separator under the action of gravity and is discharged from the drain port, while the dried gas is discharged from the gas outlet. However, existing gas-water separators generally have large equipment size and complex structure in order to achieve a better gas-water separation efficiency, which is not conducive to the cost control of the oxygen-enriched production system. In addition, when using a roll membrane assembly to produce oxygen enrichment, a box structure is usually adopted, which will be affected by the position, geometric size, geometric shape, air intake, air intake pressure and volume of the air inlet. If no special treatment is performed, it is difficult to ensure that all membrane assemblies in the box have the same air intake pressure and air intake volume. For example, the membrane assembly near the air inlet may be subjected to greater pressure than the membrane assemblies on both sides of it, which is not conducive to the operation of the system. Summary of the invention

[0003] The object of the present invention is to provide a membrane oxygen-enriched oxygen production system, which has a small footprint, high operating efficiency, and provides oxygen-enriched air of stable and high quality.

[0004] Another object of the present invention is to provide a membrane oxygen-enriched oxygen production process, which is simple to operate, has high production efficiency, and can produce oxygen-enriched air with stable and high quality.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A membrane oxygen-enriched oxygen production system comprises a first frame and a second frame;

[0007] The first frame is provided with an air filter at the top and a centrifugal fan at the bottom. The inlet of the air filter is connected to the outside, and the outlet of the air filter is connected to the inlet of the centrifugal fan through a first pipeline.

[0008] The second frame is provided with a roll-type membrane assembly box on the top and a Roots vacuum unit on the bottom; the air outlet on the top of the roll-type membrane assembly box is connected to the inlet of the Roots vacuum unit through a second pipeline;

[0009] A steam-water separation device is provided between the first frame and the second frame, and the air inlet of the steam-water separation device is connected to the outlet of the centrifugal fan through a third pipeline; the air outlet of the steam-water separation device is connected to the air inlet of the roll-type membrane assembly box through a fourth pipeline; an air storage tank is provided outside the second frame, and the inlet of the air storage tank is connected to the outlet of the Roots vacuum unit through a fifth pipeline;

[0010] The steam-water separation device comprises:

[0011] A box body, comprising a bottom plate, two end plates, two side plates and a top plate, wherein the two side plates and the two end plates extend upward from opposite sides of the bottom plate respectively; wherein the two end plates are higher than the two side plates, and the two ends of the top plate are fixedly connected to the top ends of the two end plates, so that a gap is formed between the top plate and the two side plates, which are the air inlet and the air outlet respectively;

[0012] a partition having a plurality of drainage holes, the partition being horizontally arranged in the box body, dividing the box body into an upper layer and a lower layer; the upper layer of the box body is a steam-water separation room, the lower layer of the box body is a water accumulation room, the two side plates are higher than the partition; a drainage port is arranged on the bottom plate of the lower layer of the box body;

[0013] A plurality of double-hook corrugated plates, with a plurality of water-collecting hooks disposed on both sides of the plurality of double-hook corrugated plates; the plurality of double-hook corrugated plates are perpendicular to the partition plate and the two side plates, and are disposed on the upper layer of the box body;

[0014] The roll-type membrane assembly box comprises an air inlet and air pressure structure, a channel structure with an air equalization channel and an inclined adjustment plate, and a box structure on which the roll-type membrane assembly is installed;

[0015] The air intake and compression structure comprises a first shell in a square cylinder shape, having a first port and a second port; the first port is provided with a rectangular first sealing baffle, the top of the first sealing baffle is provided with a rectangular air intake port, and the air intake port is connected to the air intake pipeline;

[0016] The channel structure includes a second shell in the form of a square cylinder, having a third port and a fourth port; the third port is provided with a rectangular second sealing baffle, and an air equalizing block is provided between the fourth port and the second port; the air equalizing block is in the form of a rectangular parallelepiped, and a number of evenly distributed transverse air channels are provided inside; the two ends of the air equalizing block are respectively located in the second port and the fourth port, and the second port and the fourth port are closed; a rectangular adjustment plate is provided in the second shell, the width of the adjustment plate corresponds to the width of the second shell, and one end of the adjustment plate is fixedly connected to the bottom plate of the second shell near the fourth port, and the other end is fixedly connected to the inner side of the second sealing baffle, so that the height of the adjustment plate gradually increases from the fourth port to the third port, and an air equalizing channel is formed in the space above the adjustment plate; the top plate of the second shell is provided with a number of through holes, and a roll membrane assembly is fixedly provided on the top of each through hole, and each through hole is connected to the air inlet end of the corresponding roll membrane assembly;

[0017] The box structure comprises a third outer shell with an opening downward, which is fixed to the top of the second outer shell and covers each roll-type membrane assembly; the air outlets of each roll-type membrane assembly in the third outer shell are connected to the second pipeline.

[0018] Furthermore, an air compression plate is provided at the middle portion of the top surface of the first shell and extends toward the inside of the first shell, and the longitudinal section of the air compression plate is S-shaped.

[0019] Furthermore, the angle between the air pressure plate along the air intake direction and the horizontal direction gradually increases from zero degree to 90 degrees and then gradually decreases to zero degree.

[0020] Furthermore, the angle between the adjustment plate and the horizontal direction is 3 degrees.

[0021] Furthermore, the air filter is a combined three-stage filter, including a first-stage filter of grade G4, a second-stage filter of grade F8, and a third-stage filter of grade H13, which are connected in sequence.

[0022] Furthermore, the first-stage filter, the second-stage filter and the third-stage filter are all provided with a differential pressure gauge for detecting changes in pressure drop.

[0023] Furthermore, the plurality of double-hook corrugated plates are of a three-layer structure, including an upper layer of a corrugated plate, a base plate of a corrugated plate and a lower layer of a corrugated plate, the middle layer is a base plate of a corrugated plate, and the upper layer of the corrugated plate and the lower layer of the corrugated plate include a plurality of bent plates; the base plate of the corrugated plate is integrally stamped and formed, symmetrical on both sides, including two connecting parts and a corrugated part, the two connecting parts are straight plates, located on the left and right sides of the corrugated part, and the two are on a straight line; the trough and the crest of the corrugated part are connected in series in a zigzag shape, and are distributed on both sides of the above-mentioned straight line in sequence; each crest includes an ascending segment and a descending segment, and each ascending segment and descending segment has an A surface facing the air inlet direction and an A surface facing away from the air inlet The B side in the direction; the plurality of bending plates include a plurality of single-fold plates and a plurality of double-fold plates, the single-fold plate has a fixed portion and a bending portion, the double-fold plate has a fixed portion and two bending portions, and the cross-section is Z-shaped; a single-fold plate is respectively fixedly connected to the A side of the upward segment or the downward segment connected by the two connecting portions, the fixed portion of the single-fold plate is fixedly connected to the A side, so that the bending portion forms a water accumulation hook with the corrugated plate substrate on the adjacent B side; the A sides of the remaining plurality of upward segments and downward segments are respectively fixedly connected to the fixed portion of a double-fold plate, the bending portions of the plurality of double-fold plates form a plurality of water accumulation hooks with the plurality of B sides, and a gap is left between the bending portions of two adjacent bending plates.

[0024] Furthermore, the length of the bent portion of the bending plate relative to the wind inlet direction is longer than the length relative to the direction away from the wind inlet direction, so that a plurality of long water hooks and a plurality of short water hooks are formed between the bent portions of the plurality of bending plates and the corrugated plate substrate. The long water hook is the one with the opening direction relative to the wind inlet direction, and the short water hook is the one with the opening direction relative to the direction away from the wind inlet direction.

[0025] Furthermore, a plurality of symmetrical slots are provided on the inner sides of the two upper side plates of the box body, the plurality of slots are perpendicular to the partition plate, and the connecting parts of the plurality of double-hook corrugated plates are inserted into the slots.

[0026] A membrane-based oxygen-enriched oxygen production process, using the membrane-based oxygen-enriched oxygen production system, includes the following steps: natural air is purified by the air filter and then sent to the steam-water separator through a pipeline by the centrifugal fan, and then sent to the roll-type membrane component box through a pipeline after most of the gaseous moisture is removed, and the roots vacuum unit sends the extracted oxygen-enriched air to the gas storage tank.

[0027] The beneficial effects of the present invention are as follows: the membrane-based oxygen-enriched oxygen production system and process of the present invention, due to the adoption of a small-volume and highly efficient water-removing steam-water separation device, and an equalizing-pressure air inlet roll-type membrane component box capable of maintaining consistent air inlet pressure and air volume of each membrane component, can enable the system to occupy a small area and have high operating efficiency, and can provide stable and high-quality oxygen-enriched air for oxygen-enriched combustion-supporting calcination occasions such as cement rotary kilns, lime rotary kilns, and industrial boilers, so as to increase the flame temperature in the kiln, increase the burnout rate, and thereby achieve the effects of reducing consumption and improving quality, which is beneficial to energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the membrane oxygen-enriched oxygen production system of the present invention.

[0029] Figure 2 It is a top view of the membrane oxygen-enriched oxygen production system of the present invention.

[0030] Figure 3 It is a schematic structural diagram of the steam-water separation device of the membrane oxygen-enriched oxygen production system of the present invention.

[0031] Figure 4 It is a schematic diagram of the arrangement of double-hook corrugated plates of a gas-water separation device of a membrane oxygen-enriched oxygen production system according to the present invention.

[0032] Figure 5 It is a partial structural schematic diagram of the steam-water separation device of the membrane oxygen-enriched oxygen production system of the present invention.

[0033] Figure 6 It is a schematic diagram of the double-hook corrugated plate structure of an embodiment of a steam-water separation device of a membrane oxygen-enriched oxygen production system of the present invention.

[0034] Figure 7 yes Figure 6 Schematic diagram of the corrugated board substrate part.

[0035] Figure 8 yes Figure 6 Schematic diagram of the top view of the double-hook corrugated plate.

[0036] Fig. 9 It is a structural schematic diagram of the pressure-equalizing air-inlet roll-type membrane assembly box of the present invention.

[0037] Fig.10 It is a front view of the pressure equalizing air inlet roll membrane module box of the present invention.

[0038] Fig.11 It is a top view of the pressure equalizing air inlet roll membrane assembly box of the present invention.

[0039] Fig.12 yes Fig.10 Cross-sectional view along the AA direction. DETAILED DESCRIPTION

[0040] The structure of the present invention and the technical effects to be achieved will be described below with specific embodiments in combination with the accompanying drawings. However, the selected embodiments are only used for illustration and explanation and are not intended to limit the scope of the present invention.

[0041] like Figure 1-Figure 2 As shown, the present invention provides a membrane oxygen-enriched oxygen production system, comprising a first frame 1a and a second frame 2a.

[0042] The first frame 1 a is provided with an air filter 3 a at the top and a centrifugal fan 4 a at the bottom. The inlet of the air filter 3 a is connected to the outside, and the outlet of the air filter 3 a is connected to the inlet of the centrifugal fan 4 a through a first pipe 5 a. Preferably, the air filter 3 a is a combined three-stage filter, including a first-stage filter of grade G4, a second-stage filter of grade F8, and a third-stage filter of grade H13 connected in sequence. The first-stage filter, the second-stage filter, and the third-stage filter are all provided with a differential pressure gauge for detecting changes in pressure drop. Once the set threshold is exceeded, the operator will be automatically prompted to replace the corresponding filter. After the above three-stage filtration, the cleanliness of the air can meet the air intake requirements of the spiral membrane assembly (0.3µm, 0.1mg / m3).

[0043] The second frame 2a has a roll-type membrane assembly box 6a at the top and a roots vacuum unit 7a at the bottom. The air outlet at the top of the roll-type membrane assembly box 6a is connected to the inlet of the roots vacuum unit 7a through a second pipeline 8a.

[0044] A steam-water separation device 9a is provided between the first frame 1a and the second frame 2a, and the air inlet of the steam-water separation device 9a is connected to the outlet of the centrifugal fan 4a through a third pipe 10a. The air outlet of the steam-water separation device 9a is connected to the air inlet of the roll-type membrane module box 6a through a fourth pipe 11a. An air storage tank 12a is provided outside the second frame 2a, and the inlet of the air storage tank 12a is connected to the outlet of the Roots vacuum unit 7a through a fifth pipe 13a.

[0045] In the present invention, Figure 3-Figure 8As shown, the steam-water separation device 9a includes a box body 1, a partition plate 2 in the box body and a plurality of double-hook corrugated plates 3 in the box body. The box body 1 includes a bottom plate 11, two side plates 13, two end plates 12 and a top plate 14. The two side plates 13 and the two end plates 12 extend upward from the opposite sides of the bottom plate 11 respectively, and the height of the two side plates 13 is lower than the two end plates 12. The two ends of the top plate 14 are respectively fixed to the top of the two end plates 12, so that a gap is formed between the top plate 14 and the two side plates 13, which are an air inlet 15 and an air outlet 16 respectively. The air inlet 15 is connected to the third pipe 10a, and the air outlet 16 is connected to the fourth pipe 11a. In order to see the setting method of the double-hook corrugated plate more intuitively, Figure 4 The side panels 13, right side end panel 12 and top panel 14 of the front air inlet 15 are not shown. The partition 2 is horizontally arranged in the box body 1, dividing the box body 1 into an upper layer and a lower layer. There are a plurality of drainage holes 21 on the partition 2. The upper layer of the box body is a steam-water separation room, and the lower layer of the box body is a water accumulation room 4. The height of the two side panels is higher than the partition. A drainage port is arranged on the bottom plate 11. When the separated liquid accumulates to a certain height, the liquid level sensor will be triggered and the drainage switch at the drainage port on the bottom plate 11 will be automatically opened to drain the water. Figure 5 As shown ( Figure 5 The top plate and the double-hook corrugated plate are not shown). The inner sides of the two side plates 13 of the upper layer of the box body 1 are provided with a plurality of symmetrical slots 18 perpendicular to the partition plate 2.

[0046] like Figure 7 , 8 As shown, a plurality of double-hook corrugated plates 3 are divided into three layers, including a corrugated plate upper layer 32, a corrugated plate substrate 31 and a corrugated plate lower layer 33, and the middle layer is the corrugated plate substrate 31. The corrugated plate substrate 31 is integrally stamped and symmetrical, and has a corrugated portion 312 and two connecting portions 311. The two connecting portions 311 are arranged on the left and right sides of the corrugated portion 312. The two connecting portions 311 are straight plates, and the two connecting portions 311 are on a straight line; the trough and the crest of the corrugated portion are connected in series in a zigzag shape, and are distributed on both sides of the above-mentioned straight line in sequence; each crest of the corrugated portion 312 includes an upward segment 313 and a downward segment 314. Each of the upward segment 313 and the downward segment 314 has an A surface 5 facing the air inlet direction and a B surface 6 facing away from the air inlet direction. Figure 7 , 8 In the figure, the air inlet direction W is from left to right. The upper layer 32 of the corrugated plate and the lower layer 33 of the corrugated plate both have a plurality of bending plates 34, including two single folding plates 341 and a plurality of double folding plates 342. The single folding plates 341 have a fixed portion 3411 and a bending portion 3412; the double folding plates 342 have a Z-shaped cross section, with a fixed portion 3421 in the middle and a bending portion 3422 at each end bending in different directions. Figure 8, the upper side of the upward section 313 and the lower side of the downward section 314 are the A surface 5, and the lower side of the upward section 313 and the upper side of the downward section 314 are the B surface 6. The upper layer 32 of the corrugated plate has a single folded plate 341, whose fixing portion 3411 is fixedly connected to the A surface 5 of the upward section 313 connected to the right connecting portion 311; the lower layer 33 of the corrugated plate also has a single folded plate 341, whose fixing portion 3411 is fixedly connected to the A surface 5 of the downward section 314 connected to the left connecting portion 311. The bending portions 3412 of the two single folded plates 341 and the adjacent B surfaces 6 each form a water accumulation hook 35. The fixed portion 3421 of each of the double folded plates 342 of the upper layer 32 and the lower layer 33 of the corrugated plate is fixedly connected to each A surface 5 of the corrugated portion 312, so that the bent portion 3422 forms a water accumulation hook 35 on the adjacent B surface 6 and the corrugated plate base plate 31, and a gap is left between the bent portions 3412 or 3422 of two adjacent bent plates 34. The bending angle of the bent plate 34 is the same as the bending angle of the corrugated portion 312. The side of the bent portion 3412 and the bent portion 3422 of the bent plate 34 facing the wind inlet direction W is longer than the side facing away from the wind inlet direction W, so that each B surface 6 forms a long water accumulation hook 351 and a short water accumulation hook 352, the opening direction of the long water accumulation hook 351 facing the wind inlet direction W, and the opening direction of the short water accumulation hook 352 facing away from the wind inlet direction W. The connection parts 311 of the plurality of double-hook corrugated plates 3 are inserted into the slots 18 of the two side plates 13, and the plurality of double-hook corrugated plates 3 are fixed to the upper layer of the box body 1 perpendicularly to the partition plate 2 and the side plates 13. The drainage holes 21 of the partition plate 2 are located directly below the water collection hooks 35, so that the liquid water collected by the water collection hooks 35 can directly flow into the water collection room 4 at the lower layer of the box body.

[0047] Specifically, the distance between two adjacent double-hook corrugated plates 3 is 10 mm. Since the gaseous water in the air is to be removed, the diameter of the water molecule is relatively small, especially when the temperature is high. Therefore, in order to obtain a good removal effect, the air duct is intentionally designed to be relatively narrow; in addition, due to the high wind speed, in order to avoid the double-hook corrugated plate 3 from vibrating badly under the impact of the air and causing secondary water carryover, it is also appropriate to select a narrower air duct to control the flow field pressure in the air duct within a certain range and not too large.

[0048] The angle between the upper section 313 and the lower section 314 of the double-hook corrugated plate and the central axis of the corrugated plate base is the wave angle 7, and in this embodiment, the wave angle 7 is 30 degrees. The larger the wave angle 7, the greater the change angle of the wind flow field in the wind duct, the greater the inertial force of the fluid, which is beneficial to improve the steam-water separation effect, but the greater the wind pressure, the easier it is to cause the double-hook corrugated plate 3 to produce undesirable vibration. Therefore, it is generally not greater than 45 degrees. The 30-degree angle set in this embodiment is an optimized value obtained based on CFD simulation analysis.

[0049] In order to obtain a good gaseous water removal effect and avoid the problem of secondary carryover, the third pipe 10a sets the air supply speed to 5.5 m / s. Wet air enters the upper layer of the device through the air inlet. When the airflow carrying tiny droplets passes through the double hook corrugated plate 3, the wet airflow changes its direction of movement many times in the separator due to the tortuous structure of the flow channel. The dry airflow can continue to move forward through the double hook corrugated plate 3, while the droplets are difficult to deflect with the airflow when passing through the bend, but hit the double hook corrugated plate 3, forming a water film on the wall surface and being blown into the water accumulation hook 35 under the action of the airflow. The water removed under the action of gravity flows down along the water accumulation hook 35, and flows into the water accumulation room 4 in the lower layer of the box through the drainage hole 21 on the partition 2 below the water accumulation hook 35. A drainage port is provided on the bottom plate. When the separated liquid accumulates to a certain height, it will trigger the liquid level sensor and automatically open the drainage switch of the drainage port on the bottom plate to discharge the water. The double hook corrugated plate 3 design adopted in this embodiment is beneficial to improving the effect of removing gaseous water in wet air.

[0050] Through a large number of CFD simulation calculations, the simulation results show that under temperature and humidity conditions, the water removal efficiency of the steam-water separation device used in the present invention can reach 95%. Even at a high temperature of 40 degrees Celsius, the water removal efficiency is not less than 75%.

[0051] In the present invention, Figure 9-11 As shown, the roll-type membrane assembly box 6a has a pressure-equalizing air inlet structure, including an air inlet and pressure structure 1', a channel structure 2' with an air equalizing channel and an inclined adjustment plate, and a box structure 3' in which a certain number of roll-type membrane assemblies are installed. The air inlet and pressure structure 1' and the channel structure 2' together constitute the pressure-equalizing air inlet of the box structure 3'.

[0052] The air intake and compression structure 1' includes a first outer shell 11' in the shape of a square cylinder, having a first port 111' and a second port 112'. The first port 111' is provided with a rectangular first sealing baffle 12', and a rectangular air inlet 13' is provided on the top of the first sealing baffle 12', and the air inlet 13' is connected to the fourth pipe 11 a. Through the fourth pipe 11 a, the air after purification and removal of gaseous moisture can be introduced into the channel structure 2' behind, and then supplied to each roll membrane assembly in the box structure 3'. Preferably, the length of the first outer shell 11' is 1500 mm (taking the case where 168 membrane assemblies are installed as an example, the arrangement is 8x21, and each membrane assembly produces 30 standard cubic meters of oxygen-enriched air per hour, the same below).

[0053] The channel structure 2' comprises a second shell 21' in a square cylindrical shape, having a third port 211' and a fourth port 212'. The third port 211' is provided with a rectangular second sealing baffle 22', and a gas equalizing block 23' is provided between the fourth port 212' and the second port 112'. Fig.12As shown, the gas equalizing block 23' is in the shape of a rectangular parallelepiped, and a plurality of evenly distributed transverse air channels 24' are provided inside. Preferably, on the longitudinal section of the gas equalizing block 23', the mesh number of the transverse air channels 24' is 4x40. The two ends of the gas equalizing block 23' are respectively located in the second port 112' and the fourth port 212', and the second port 112' and the fourth port 212' are closed. Preferably, the width and height of the first shell 11' and the second shell 21' are equal, so that their longitudinal sections are the same.

[0054] The second shell 21' contains a common air inlet for supplying air to all the roll-type membrane assemblies. In order to make the air pressure entering each roll-type membrane assembly the same, a rectangular adjustment plate 25' is provided in the second shell 21'. The width of the adjustment plate 25' corresponds to the width of the second shell 21', and one end of the adjustment plate 25' is fixedly connected to the bottom plate of the second shell 21' near the fourth port 212', and the other end is fixedly connected to the inner side of the second sealing baffle 22', so that the height of the adjustment plate 25' gradually increases from the fourth port 212' to the third port 211', thereby gradually reducing the gas flow space inside the second shell 21', and forming a gas equalization channel in the space above the adjustment plate. Preferably, the angle between the adjustment plate 25' and the horizontal direction is 3 degrees. The top plate of the second shell 21' is provided with a plurality of through holes, and a roll-type membrane assembly is fixedly provided on the top of each through hole (not shown in the figure, which is the prior art), each roll-type membrane assembly is fixedly connected to the top plate of the second shell 21', and each through hole is connected to the air inlet end of the corresponding roll-type membrane assembly to supply the air in the second shell 21' to each roll-type membrane assembly for performing the oxygen enrichment procedure.

[0055] The box structure 3' includes a third shell 31' with an opening downward, which is fixed to the top of the second shell 21' and covers each roll-type membrane assembly for easy manufacturing, transportation and installation. In the third shell 31', the number of the roll-type membrane assemblies arranged horizontally is less than the number of the roll-type membrane assemblies arranged vertically (horizontally: i.e. Fig.11 The direction parallel to the air inlet 13'; longitudinal direction: i.e. Fig.11 The air outlets of the spiral membrane modules in the third housing 31' are connected to the second pipe 8a to transport the oxygen-enriched air to the next device.

[0056] A pressure plate 14' is provided in the middle of the top surface of the first housing 11' and extends toward the inside of the first housing 11'. The longitudinal section of the pressure plate 14' is S-shaped and is used to adjust the air intake so that the uniformity of the gas entering each roll-type membrane assembly in the span direction is improved to a certain extent, and the uniformity along the streamline direction is also improved to a certain extent. The angle between the pressure plate 14' along the air intake direction and the horizontal direction gradually increases from zero to 90 degrees and then gradually decreases to zero degrees, that is, the angle between the plane tangent to the curved surface of the pressure plate 14' and the horizontal direction changes along the air intake direction from zero to 90 degrees and then gradually decreases to zero degrees.

[0057] The air after being purified and having its gaseous moisture removed by the air filter 3a and the steam-water separator 9a is connected to the air inlet 13' of the first shell 11' through the fourth pipe 11a, and enters the second shell 21' through the S-shaped air pressure plate 14' and the transverse air passage of the air equalizing block 23' in sequence; the air inlet located in the second shell 21' adopts an inclined adjustment plate 25', so that the longitudinal cross-sectional area of ​​the air inlet in the second shell 21' gradually decreases from the fourth port 212' to the third port 211', so that the air pressure entering each through hole is basically the same, and then the air pressure entering each roll membrane assembly is also the same, which is beneficial to improving the working efficiency of the entire system.

[0058] The present invention also provides a membrane oxygen-enriched oxygen production process, using the membrane oxygen-enriched oxygen production system, including the following steps: natural air is purified by the air filter 3a, and then sent to the steam-water separator 9a through a pipeline by the centrifugal fan 4a, the gaseous water separation efficiency of the steam-water separator 9a is not less than 85%, and then sent to the roll membrane assembly box 6a through a pipeline after removing most of the gaseous water, and the roots vacuum unit 7a sends the extracted oxygen-enriched air to the gas storage tank 12a. Finally, it is sent to cement rotary kiln, lime rotary kiln and other occasions by the roots blower for oxygen-enriched combustion and calcination.

[0059] The membrane oxygen-enriched oxygen production system of the present invention adopts a roll-type membrane module box with equalized pressure air intake. Through the distribution of the membrane modules and the optimization of the cross-section of the air intake duct, the air intake pressure and air intake volume of each roll-type membrane module can be kept consistent, thereby improving the operating efficiency of the system. The membrane oxygen-enriched oxygen production system of the present invention also adopts an efficient steam-water separation device, which has a good dehydration effect on humid air, has a small device size, high dehydration efficiency, and is easy to install.

[0060] The present invention is defined by the claims, but based on this, a person skilled in the art may make various obvious changes or modifications, which should be within the main spirit and scope of protection of the present invention.

Claims

1. A membrane oxygen-enriched oxygen production system, It is characterized in that comprising a first frame and a second frame; The first frame is provided with an air filter at the top and a centrifugal fan at the bottom. The inlet of the air filter is connected to the outside, and the outlet of the air filter is connected to the inlet of the centrifugal fan through a first pipeline. The second frame is provided with a roll-type membrane assembly box on the top and a Roots vacuum unit on the bottom; the air outlet on the top of the roll-type membrane assembly box is connected to the inlet of the Roots vacuum unit through a second pipeline; A steam-water separation device is provided between the first frame and the second frame, and the air inlet of the steam-water separation device is connected to the outlet of the centrifugal fan through a third pipeline; the air outlet of the steam-water separation device is connected to the air inlet of the roll-type membrane assembly box through a fourth pipeline; an air storage tank is provided outside the second frame, and the inlet of the air storage tank is connected to the outlet of the Roots vacuum unit through a fifth pipeline; The steam-water separation device comprises: A box body, comprising a bottom plate, two end plates, two side plates and a top plate, wherein the two side plates and the two end plates extend upward from opposite sides of the bottom plate respectively; wherein the two end plates are higher than the two side plates, and the two ends of the top plate are fixedly connected to the top ends of the two end plates, so that a gap is formed between the top plate and the two side plates, which are the air inlet and the air outlet respectively; a partition having a plurality of drainage holes, the partition being horizontally arranged in the box body, dividing the box body into an upper layer and a lower layer; the upper layer of the box body is a steam-water separation room, the lower layer of the box body is a water accumulation room, the two side plates are higher than the partition; a drainage port is arranged on the bottom plate of the lower layer of the box body; A plurality of double-hook corrugated plates, with a plurality of water-collecting hooks disposed on both sides of the plurality of double-hook corrugated plates; the plurality of double-hook corrugated plates are perpendicular to the partition plate and the two side plates, and are disposed on the upper layer of the box body; The roll-type membrane assembly box comprises an air inlet and air pressure structure, a channel structure with an air equalization channel and an inclined adjustment plate, and a box structure with a roll-type membrane assembly installed; The air intake and compression structure comprises a first shell in a square cylinder shape, having a first port and a second port; the first port is provided with a rectangular first sealing baffle, the top of the first sealing baffle is provided with a rectangular air intake port, and the air intake port is connected to the air intake pipeline; The channel structure includes a second shell in the form of a square cylinder, having a third port and a fourth port; the third port is provided with a rectangular second sealing baffle, and an air equalizing block is provided between the fourth port and the second port; the air equalizing block is in the form of a rectangular parallelepiped, and a number of evenly distributed transverse air channels are provided inside; the two ends of the air equalizing block are respectively located in the second port and the fourth port, and the second port and the fourth port are closed; a rectangular adjustment plate is provided in the second shell, the width of the adjustment plate corresponds to the width of the second shell, and one end of the adjustment plate is fixedly connected to the bottom plate of the second shell near the fourth port, and the other end is fixedly connected to the inner side of the second sealing baffle, so that the height of the adjustment plate gradually increases from the fourth port to the third port, and an air equalizing channel is formed in the space above the adjustment plate; the top plate of the second shell is provided with a number of through holes, and a roll membrane assembly is fixedly provided on the top of each through hole, and each through hole is connected to the air inlet end of the corresponding roll membrane assembly; The box structure comprises a third outer shell with an opening downward, which is fixed to the top of the second outer shell and covers each roll-type membrane assembly; the air outlets of each roll-type membrane assembly in the third outer shell are connected to the second pipeline.

2. The membrane oxygen-enriched oxygen production system according to claim 1, Features: The angle between the adjustment plate and the horizontal direction is 3 degrees.

3. The membrane oxygen-enriched oxygen production system according to claim 1, Features: The air filter is a combined three-stage filter, including a first-stage filter of grade G4, a second-stage filter of grade F8, and a third-stage filter of grade H13 which are connected in sequence.

4. The membrane oxygen-enriched oxygen production system according to claim 3, Features: The first-stage filter, the second-stage filter and the third-stage filter are all provided with a differential pressure gauge for detecting changes in pressure drop.

5. The membrane oxygen-enriched oxygen production system according to claim 1, Features: The plurality of double-hook corrugated plates are of a three-layer structure, including an upper layer of a corrugated plate, a base plate of a corrugated plate and a lower layer of a corrugated plate, the middle layer is a base plate of a corrugated plate, and the upper layer of the corrugated plate and the lower layer of the corrugated plate include a plurality of bent plates; the base plate of the corrugated plate is integrally stamped and symmetrical, including two connecting parts and a corrugated part, the two connecting parts are straight plates, located on the left and right sides of the corrugated part, and the two are on a straight line; the trough and the crest of the corrugated part are connected in series in a zigzag shape, and are distributed on both sides of the above-mentioned straight line in sequence; each crest includes an upward segment and a downward segment, and each upward segment and downward segment has an A surface facing the air inlet direction and an A surface facing away from the air inlet direction. B surface; the plurality of bending plates include a plurality of single-fold plates and a plurality of double-fold plates, the single-fold plate has a fixed portion and a bending portion, the double-fold plate has a fixed portion and two bending portions, and the cross-section is Z-shaped; a single-fold plate is respectively fixedly connected to the A surface of the upward segment or the downward segment connected by the two connecting portions, the fixed portion of the single-fold plate is fixedly connected to the A surface, so that the bending portion forms a water accumulation hook with the corrugated plate substrate on the adjacent B surface; the A surfaces of the remaining plurality of upward segments and downward segments are respectively fixedly connected to the fixed portions of a double-fold plate, the bending portions of the plurality of double-fold plates form a plurality of water accumulation hooks with the plurality of B surfaces, and a gap is left between the bending portions of two adjacent bending plates.

6. The membrane oxygen-enriched oxygen production system according to claim 5, Features: The length of the bent portion of the bending plate relative to the wind inlet direction is longer than the length relative to the direction away from the wind inlet direction, so that a plurality of long water hooks and a plurality of short water hooks are formed between the bent portions of the plurality of bending plates and the corrugated plate substrate. The long water hook has an opening direction relative to the wind inlet direction, and the short water hook has an opening direction relative to the direction away from the wind inlet direction.

7. The membrane oxygen-enriched oxygen production system according to claim 1, Features: A plurality of symmetrical slots are arranged on the inner sides of the two side plates on the upper layer of the box body. The plurality of slots are perpendicular to the partition plate, and the connecting parts of the plurality of double-hook corrugated plates are inserted into the slots.

8. A membrane oxygen-enriched oxygen production process, It is characterized in that The membrane oxygen-enriched oxygen production system according to any one of claims 1 to 7 comprises the following steps: natural air is purified by the air filter and then sent to the gas-water separation device through a pipeline by the centrifugal fan, and then sent to the roll membrane assembly box through a pipeline after most of the gaseous moisture is removed, and the extracted oxygen-enriched air is sent to the gas storage tank by the Roots vacuum unit.

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