Equipment for reducing upper tower pressure and system energy consumption of air separation device

Abstract

The invention relates to the technical field of air separation, in particular to equipment for reducing upper tower pressure and system energy consumption of an air separation device, which comprises an air compressor, a molecular sieve purifier and a rectifying tower, and further comprises a rotational flow drainage assembly, a flow guide pipe I, an adjusting assembly, an electric push rod and a mounting plate. According to the molecular sieve purifier disclosed by the invention, moisture, acetylene, carbon dioxide and other hydrocarbons in compressed air and waste nitrogen can be further filtered through the rotational flow blades, the splitter plate and a plurality of drainage holes formed in the splitter plate, so that the blocking speed of the molecular sieve purifier is reduced; compressed air or waste nitrogen can penetrate through the molecular sieve purifier in the direction parallel to the central axis of the molecular sieve purifier, so that the compressed air or the waste nitrogen is prevented from colliding with the molecular sieve purifier in an irregular flowing state, pulverization of the molecular sieve purifier is reduced, and meanwhile, pressure loss is reduced; therefore, the upper tower pressure and the system energy consumption are effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of air separation, in particular to a device for reducing the upper tower pressure and system energy consumption of an air separation device. Background Art

[0002] The core of the air separation unit is to separate various gases from the air. Its workflow includes: air separation → compression → cooling → filtration → dehydration → distillation. The distillation stage requires a distillation tower, among which the nitrogen distillation tower is widely used in occasions that require high-purity nitrogen, such as the chemical industry, food packaging, electronics manufacturing, laboratories, and healthcare. It provides a continuous and stable supply of nitrogen to meet various industrial and production needs.

[0003] With the progress of industry, the energy consumption problem of air separation units has become increasingly prominent. The higher the energy consumption, the higher the production cost. Since the main energy consumption of air separation units depends on the outlet pressure of the air compressor, and the outlet pressure of the air compressor depends on the upper tower pressure of the distillation tower, the greater the upper tower pressure of the distillation tower, the greater the outlet pressure of the air compressor, which will lead to increased energy consumption of air compression. Since the nitrogen will experience pressure loss due to friction with the inner wall of the pipeline during the flow inside the pipeline after being discharged from the upper tower, and the dirty nitrogen not only has friction with the inner wall of the pipeline, but also is blocked by the molecular sieve purifier, which increases the pressure loss, and the pressure loss caused by the molecular sieve purifier to the dirty nitrogen is much greater than the pressure loss caused by the dirty nitrogen when it flows in the pipeline, so it is necessary to increase the upper tower pressure to ensure the normal transportation of the gas, but it will increase the energy consumption of the air compressor. In view of the above problems, there are good solutions in the prior art, such as a method for reducing the upper tower pressure and system energy consumption of an air separation unit with patent number: CN110108090B. Adding dirty nitrogen induced draft fans, nitrogen induced draft fans and refrigerators to conventional air separation units can further reduce the outlet pressure of the air compressor, reduce the energy consumption of the air compressor, and achieve energy saving of the air separation system. However, the following defects still exist: the molecular sieve purifier in the air separation unit includes two stages, namely the adsorption stage and the regeneration stage. The adsorption stage and the regeneration stage are opposite to each other. In the adsorption stage, the molecular sieve purifier will purify the air passing through the air compressor, air cooler, aftercooler and steam-water separator, remove the water, acetylene, carbon dioxide and other hydrocarbons therein, and ensure the purity of the air entering the subsequent distillation tower; in the regeneration stage, the dirty nitrogen enters the molecular sieve purifier as regeneration gas, and the molecular sieve purifier purifies a small amount of water, acetylene, carbon dioxide and other hydrocarbons in the dirty nitrogen. With the continuous operation of the air separation unit, the amount of compressed air or dirty nitrogen passing through the molecular sieve purifier continues to increase, causing the molecular sieve purifier to gradually clog, increasing the resistance of the compressed air or dirty nitrogen passing through the molecular sieve purifier, further expanding the pressure loss, causing the air compressor to require a higher outlet pressure to overcome the pressure loss, and still increasing the upper tower pressure and system energy consumption.

[0004] Therefore, in order to solve the above problems, a device for reducing the upper tower pressure and system energy consumption of an air separation unit is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a device for reducing the upper tower pressure and system energy consumption of an air separation device, and solve the problem that as the air separation device continues to work, the molecular sieve purifier gradually becomes blocked, causing the pressure loss to increase, and then the air compressor needs a higher outlet pressure to overcome the pressure loss, which still increases the upper tower pressure and system energy consumption. Through the swirl blades, the diverter plate and the multiple drainage holes opened in the diverter plate, the moisture, acetylene, carbon dioxide and other hydrocarbons in the compressed air and dirty nitrogen can be further filtered, and the blockage speed of the molecular sieve purifier can be slowed down. At the same time, the compressed air or dirty nitrogen can pass through the molecular sieve purifier in a direction parallel to the central axis of the molecular sieve purifier, avoiding the collision of the compressed air or dirty nitrogen with the molecular sieve purifier in an irregular flow state, reducing the pulverization of the molecular sieve purifier and reducing the pressure loss, thereby effectively reducing the upper tower pressure and system energy consumption.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for reducing the upper tower pressure and system energy consumption of an air separation device, comprising an air compressor, a molecular sieve purifier and a distillation tower, and also comprising a swirl drainage component, a guide tube 1, an adjustment component, an electric push rod and a mounting plate, wherein two swirl drainage components are provided and are respectively arranged at both ends of the molecular sieve purifier, and two guide tubes 1 are provided and are respectively connected to corresponding swirl drainage components, and a swirl is formed when compressed air or dirty nitrogen flows through the corresponding swirl drainage components, and the swirl drainage component comprises a tubular filter screen, and the tubular filter screen is arranged at one end of the guide tube 1, and the central axis of the tubular filter screen The line is perpendicular to the central axis of the guide tube 1. When the vortex is generated, the vortex drainage component throws impurities in the compressed air or dirty nitrogen into the tubular filter screen through centrifugal force. The adjusting component is connected to the two vortex drainage components. The electric push rod is arranged on the outside of the molecular sieve purifier. The mounting plate is arranged at the output end of the electric push rod and connected to the adjusting component. When the electric push rod drives the mounting plate to move up, the compressed air with impurities removed passes through the molecular sieve purifier from bottom to top along the axial direction. When the electric push rod drives the mounting plate to move down, the dirty nitrogen with impurities removed passes through the molecular sieve purifier from top to bottom along the axial direction.

[0008] Preferably, the swirl drainage component also includes a sleeve, a rotating rod and a swirl blade, the molecular sieve purifier includes a shell and a sieve bed, the sieve bed is arranged inside the shell, the sleeve includes segment one and segment two, the segment two is arranged at one end of the segment one facing the middle of the shell and is truncated, the diameter of the segment two is gradually decreasing from the end of the shell to the middle of the shell, the radial cross-sectional area of ​​the smaller end of the segment two is greater than the radial cross-sectional area of ​​the guide tube one, the segment one is arranged through the end of the shell, the guide tube one is tangentially arranged on the outer surface of the segment one and is connected to the interior of the segment one, the rotating rod is coaxially arranged inside the segment one, the swirl blade is arranged on the rotating rod, the tubular filter is arranged inside the segment one and is sleeved with the swirl blade, and the tubular filter is provided with an opening.

[0009] By adopting the above scheme, after the compressed air or dirty nitrogen enters the corresponding sleeve, a swirl effect can be achieved, so that the moisture, acetylene, carbon dioxide and other hydrocarbons in the compressed air or dirty nitrogen move to the edge of the sleeve under the action of centrifugal force and are adsorbed, which greatly reduces the moisture, acetylene, carbon dioxide and other hydrocarbons in the compressed air or dirty nitrogen that enter the sieve bed, effectively slowing down the clogging speed of the sieve bed during the continuous operation of the air separation unit, thereby reducing the pressure loss of the compressed air or dirty nitrogen when passing through the sieve bed, thereby achieving the effect of reducing the upper tower pressure and system energy consumption.

[0010] Preferably, the adjustment assembly includes a guide rod, a connecting plate, a connecting rod, a bellows, a diverter plate and a plugging assembly, the guide rod is arranged through the mounting plate, the connecting plate is arranged at the end of the guide rod, one end of the connecting rod is arranged on the connecting plate, and the other end passes through the interior of the shell, the bellows is arranged between the connecting plate and the shell and is sleeved with the connecting rod, the diverter plate is coaxially arranged inside the shell and connected to the connecting rod, the molecular sieve purifier also includes a fixed rod and a conical block, the fixed rod is arranged through the sieve bed, the conical block is arranged at the end of the fixed rod and has a plurality of drainage grooves 1 on its surface, the inner circle of the lower port of the section 2 is provided with a chamfer 1, the angle of the chamfer 1 is the same as the cone angle of the conical block, the plugging assembly is arranged on the diverter plate, and when the diverter plate moves up or down, the plugging assembly blocks or opens the passage between the drainage groove 1 and the shell respectively.

[0011] By adopting the above scheme, the electric push rod is used to drive the mounting plate to move up and down, so that the molecular sieve purifier can be placed in the adsorption stage and the regeneration stage respectively (the process of compressed air flowing upward from the bottom of the sieve bed is the adsorption stage of the molecular sieve purifier), and in the adsorption stage and the regeneration stage, the lower splitter plate and the upper splitter plate can be respectively made to contact with the end of the sieve bed to limit the flow path of the compressed air or the contaminated nitrogen, and avoid the compressed air and nitrogen from colliding with the sieve bed laterally due to irregular flow, thereby achieving effective protection of the sieve bed and reducing the pressure loss when the compressed air or the contaminated nitrogen flows laterally to the sieve bed, thereby reducing the upper tower pressure and the capacity of the air compressor, that is, reducing the energy consumption of the system.

[0012] Preferably, the blocking assembly comprises a sleeve, a rubber ring, a baffle ring 1, a baffle ring 2 and a guide tube 2, the sleeve being arranged on the diverter plate and being sleeved with the fixed rod, the rubber ring being coaxially arranged inside the sleeve and having an upper inner ring provided with a chamfer 2, the chamfer 2 having the same cone angle as that of the segment 2, the baffle ring 1 being arranged inside the sleeve and being sleeved with the fixed rod, the baffle ring 2 being arranged at the end of the sieve bed and being coaxially sleeved with the diverter plate, the upper inner ring of the baffle ring 2 being provided with a chamfer 3, the surface of the chamfer 3 being provided with a drainage groove 2, one end of the guide tube 2 being connected to the guide tube 1 and being communicated with the guide tube 1, the other end of the guide tube 2 penetrating into the interior of the housing, and electromagnetic valves being provided on the tube walls of the guide tubes 1 and 2, which can prevent the compressed air from entering the upper segment 1 from the upper guide tube 1 after passing through the sieve bed, and can also prevent the polluted nitrogen from entering the lower segment 1 from the lower guide tube 1 after passing through the sieve bed.

[0013] By adopting the above scheme, during the adsorption stage of the molecular sieve purifier, the diverter plate and the sieve bed are in a separated state, and the upper conical block is blocked by the casing. Most of the compressed air can directly enter the corresponding guide tube one through the guide tube two after being purified by the sieve bed and be transported to the distillation tower position. Moreover, after the compressed air or the contaminated nitrogen passes through the sieve bed, most of the airflow can enter the inside of the guide groove two under the pressure of the edge position of the diverter plate and form a vortex again, thereby increasing the dynamic pressure of the compressed air or the contaminated nitrogen, effectively reducing the pressure loss of the compressed air, thereby reducing the energy consumption of the air compressor, that is, reducing the system energy consumption of the air separation device.

[0014] Preferably, the drainage groove 1 is a spiral groove, the spiral direction of the drainage groove 1 is the same as that of the swirl blade, and the groove width of the drainage groove 1 gradually increases from the inside to the outside of the section 2.

[0015] By adopting the above scheme, the compressed air or dirty nitrogen has a gathering effect when flowing inside the second section. The gathered compressed air or dirty nitrogen can further form a vortex under the spiral action of the drainage groove one, so that the compressed air or dirty nitrogen can be quickly dispersed on the surface of the diverter plate, avoiding the compressed air or dirty nitrogen from being too concentrated when contacting the diverter plate and causing a large pressure loss, thereby reducing the situation where the upper tower pressure increases and causes an increase in system energy consumption.

[0016] Preferably, when the chamfer 1 is in contact with the surface of the conical block, the radial cross-sectional area of ​​the guide tube 1 is smaller than the sum of the notch areas of the exposed guide groove 1.

[0017] By adopting the above scheme, after the compressed air or the dirty nitrogen enters the corresponding sleeve through the corresponding guide pipe 1, it can easily flow out from the corresponding drainage groove 1, thereby reducing the pressure loss of the compressed air or the dirty nitrogen before entering the sieve bed, thereby reducing the upper tower pressure and system energy consumption.

[0018] Preferably, a plurality of drainage holes are opened inside the diverter plate, and when the chamfer 1 is in contact with the surface of the conical block, the sum of the radial cross-sectional areas of the plurality of drainage holes is equal to the sum of the notch areas of the exposed drainage groove 1.

[0019] By adopting the above scheme, after the compressed air or the polluted nitrogen flows out from the drainage groove, it can smoothly pass through the diverter plate and enter the interior of the sieve bed from the multiple drainage holes opened inside the diverter plate, thereby further reducing the pressure loss of the compressed air or the polluted nitrogen before entering the sieve bed, thereby reducing the upper tower pressure and system energy consumption.

[0020] Preferably, the sieve bed is arranged vertically, and the axis of each drainage hole is parallel to the central axis of the sieve bed.

[0021] It can be seen that the compressed air and the contaminated nitrogen are in an irregular flow state before contacting the sieve bed. The frequent pressure changes when contacting the sieve bed will cause the sieve bed to be repeatedly impacted, thereby causing the sieve bed to be pulverized, affecting its adsorption performance while further increasing the pressure loss of the compressed air or contaminated nitrogen. Therefore, this solution is adopted. After passing through the drainage holes inside the diverter plate, the compressed air or contaminated nitrogen can enter the interior of the sieve bed in a path parallel to the central axis of the sieve bed, avoiding the irregular flow of compressed air or contaminated nitrogen and repeatedly impacting the sieve bed, increasing the service life of the sieve bed while further reducing the pressure loss, thereby reducing the upper tower pressure and system energy consumption.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Through the swirl drainage component, the adjustment component and the two diverter plates, the positions of the two diverter plates can be adjusted according to the actual work, so that the sieve bed can be in the adsorption stage and the regeneration stage respectively, so that the moisture, acetylene, carbon dioxide and other hydrocarbons in the compressed air or the contaminated nitrogen can be filtered before the compressed air or the contaminated nitrogen enters the sieve bed, the blocking speed of the sieve bed is slowed down, and the pressure loss of the compressed air or the contaminated nitrogen before entering the sieve bed is effectively reduced; after the compressed air or the contaminated nitrogen is filtered, the compressed air or the contaminated nitrogen can enter the interior of the sieve bed in a path parallel to the central axis of the sieve bed under the drainage effect of the drainage holes opened in the corresponding diverter plates, avoiding repeated impact on the end position of the sieve bed due to the irregular flow of the compressed air or the contaminated nitrogen, further reducing the pressure loss of the compressed air or the contaminated nitrogen before entering the sieve bed, thereby achieving the purpose of reducing the upper tower pressure and system energy consumption.

[0024] 2. By opening a plurality of drainage holes inside the diverter plate, it is possible to prevent the compressed air or dirty nitrogen from repeatedly hitting the end of the sieve bed in an irregular flow state and causing the end of the sieve bed to be pulverized. While ensuring the service life of the sieve bed, it is possible to prevent the sieve bed from being blocked by the pulverized position, thereby reducing the pressure loss of compressed air or dirty nitrogen when passing through the sieve bed, and further reducing the upper tower pressure and system energy consumption.

[0025] 3. By setting the rubber ring and the baffle ring 2, the drainage groove 1 on the corresponding conical block can be blocked respectively when the molecular sieve purifier is in the adsorption stage or the regeneration stage, and the chamfer 3 set on the baffle ring 2 is used to expand the flow path of the compressed air or the contaminated nitrogen, thereby reducing the pressure loss of the compressed air or the contaminated nitrogen on the flow path after flowing out from the inside of the sieve bed, and further reducing the upper tower pressure and system energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 For the present invention Figure 1 Schematic diagram of the connection structure of the medium molecular sieve purifier, the regulating component, the electric push rod and the mounting plate;

[0028] Figure 3 For the present invention Figure 2 A magnified view of the structure of the local A part;

[0029] Figure 4 It is an exploded view of the sleeve and swirl blades, tubular filter screen, fixed rod, sieve bed and conical block of the present invention;

[0030] Figure 5 The schematic diagram of the structure of the present invention is a schematic diagram of the partial cross-sectional connection structure of the molecular sieve shell and the first segment;

[0031] Figure 6 For the present invention Figure 5 The structure enlarged diagram of the local B part;

[0032] Figure 7 It is a state diagram of the molecular sieve purifier of the present invention in the regeneration stage;

[0033] Figure 8 This is a state diagram of the molecular sieve purifier of the present invention in the adsorption stage.

[0034] In the figure: 1, air compressor; 2, molecular sieve purifier; 21, housing; 22, sieve bed; 23, fixing rod; 24, conical block; 241, drainage trough 1; 3, distillation tower; 4, swirl drainage assembly; 41, sleeve; 411, section 1; 412, section 2; 4121, chamfer 1; 42, rotating rod; 43, swirl blade; 44, tubular filter; 441, opening; 5, guide pipe 1; 6, Adjustment assembly; 61. guide rod; 62. connecting plate; 63. connecting rod; 64. bellows; 65. diverter plate; 651. drainage hole; 66. plugging assembly; 661. sleeve; 662. rubber ring; 6621. chamfer 2; 663. retaining ring 1; 664. retaining ring 2; 6641. chamfer 3; 66411. drainage groove 2; 665. guide tube 2; 7. electric push rod; 8. mounting plate. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 8 The present invention provides a device for reducing the upper tower pressure and system energy consumption of an air separation device, and the technical solution is as follows:

[0037] For details, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, a device for reducing the upper tower pressure and system energy consumption of an air separation device, comprising an air compressor 1, a molecular sieve purifier 2 and a distillation tower 3, and also comprising a swirl drainage component 4, a guide tube 5, an adjustment component 6, an electric push rod 7 and a mounting plate 8, wherein two swirl drainage components 4 are provided and are respectively arranged at both ends of the molecular sieve purifier 2, two guide tubes 5 are provided and are respectively connected to the corresponding swirl drainage components 4, and a swirl is formed when compressed air or dirty nitrogen flows through the corresponding swirl drainage component 4, and the swirl drainage component 4 comprises a tubular filter 44, and the tubular filter 44 is arranged at one end of the guide tube 5, and the central axis of the tubular filter 44 is perpendicular to the central axis of the guide tube 5, and when the swirl is generated, the swirl drainage component 4 throws impurities in the compressed air or dirty nitrogen into the tubular filter 44 by centrifugal force, and the swirl drainage component 4 also comprises a sleeve 41, a rotating rod 42 and Swirl blade 43, molecular sieve purifier 2 comprises outer shell 21 and sieve bed 22, sieve bed 22 is arranged inside outer shell 21, sleeve 41 comprises section 1 411 and section 2 412, section 2 412 is arranged at one end of section 1 411 facing the middle of outer shell 21 and is truncated cone-shaped, diameter of section 2 412 is arranged decreasing from the end of outer shell 21 to the middle of outer shell 21, radial cross-sectional area of ​​the smaller end of section 2 412 is greater than radial cross-sectional area of ​​flow guide tube 1 5, section 1 411 is arranged through the end of outer shell 21, flow guide tube 1 5 is arranged tangentially on the outer surface of section 1 411 and is connected with the inside of section 1 411, rotating rod 42 is coaxially arranged inside section 1 411, swirl blade 43 is arranged on rotating rod 42, tubular filter screen 44 is arranged inside section 1 411 and is sleeved with swirl blade 43, and opening 441 is opened on tubular filter screen 44.

[0038] Under the above-mentioned setting conditions, after the compressed air or polluted nitrogen enters the corresponding section 1 411 along the tangential direction, the corresponding swirl blade 43 can be driven to rotate under the action of the kinetic energy of the airflow. During the rotation of the swirl blade 43, the compressed air or polluted nitrogen can form a swirl, and the water, acetylene, carbon dioxide and other hydrocarbons in the compressed air or polluted nitrogen move to the edge of the section 1 411 under the action of centrifugal force, so that the water, acetylene, carbon dioxide and other hydrocarbons are filtered by the tubular filter 44, avoiding entering the interior of the sieve bed 22 in the process of following the flow of the compressed air or polluted nitrogen, thereby slowing down the clogging speed of the molecular sieve purifier 2. The compressed air or contaminated nitrogen filtered by the tubular filter 44 can be gathered after entering the interior of the second section 412 (the tubular filter 44 can use an activated carbon filter to effectively filter out moisture, acetylene, carbon dioxide and other hydrocarbons in the compressed air or contaminated nitrogen), and finally flow out from the end of the second section 412, thereby accelerating the compressed air or contaminated nitrogen, compensating for the pressure loss caused by the compressed air or contaminated nitrogen passing through the tubular filter 44, and reducing the pressure loss of the compressed air or contaminated nitrogen when entering the sieve bed 22, and utilizing the swirl to increase the dynamic pressure of the gas, thereby reducing the upper tower pressure and system energy consumption.

[0039] As an embodiment of the present invention, Figure 1 , Figure 2 and Figure 3The regulating assembly 6 is connected to the two swirl drainage assemblies 4, the electric push rod 7 is arranged outside the molecular sieve purifier 2, the mounting plate 8 is arranged at the output end of the electric push rod 7 and connected to the regulating assembly 6, when the electric push rod 7 drives the mounting plate 8 to move upward, the compressed air to remove impurities passes through the molecular sieve purifier 2 from bottom to top along the axial direction, when the electric push rod 7 drives the mounting plate 8 to move downward, the dirty nitrogen to remove impurities passes through the molecular sieve purifier 2 from top to bottom along the axial direction, the regulating assembly 6 includes a guide rod 61, a connecting plate 62, a connecting rod 63, a bellows 64, a diverter plate 65 and a plugging assembly 66, the guide rod 61 is arranged through the mounting plate 8, the connecting plate 62 is arranged at the end of the guide rod 61, one end of the connecting rod 63 is arranged on the connecting plate 62, and the other end passes through the inside of the shell 21, the bellows 64 It is arranged between the connecting plate 62 and the shell 21 and is sleeved with the connecting rod 63. Under the action of the bellows 64, the airflow can be prevented from leaking from the connection between the connecting rod 63 and the shell 21. The diverter plate 65 is coaxially arranged inside the shell 21 and connected to the connecting rod 63. The molecular sieve purifier 2 also includes a fixed rod 23 and a conical block 24. The fixed rod 23 penetrates the sieve bed 22. The conical block 24 is arranged at the end of the fixed rod 23 and has a plurality of drainage grooves 241 on the surface. The drainage groove 241 is a spiral groove. The drainage groove 241 has the same spiral direction as the swirl blade 43. The groove width of the drainage groove 241 gradually increases from the inside of the section 2 412 to the outside. The inner circle of the lower port of the section 2 412 is provided with a chamfer 4121. The angle of the chamfer 4121 is the same as the cone angle of the conical block 24.

[0040] Under the above-mentioned setting conditions, the flow path of compressed air or contaminated nitrogen can be restricted through the action of chamfer 1 4121, so that the compressed air and contaminated nitrogen can only be discharged from the inside of drainage groove 1 241 in the same direction as that in section 1 411, and can be quickly dispersed on the surface of the diverter plate 65, avoiding the compressed air or contaminated nitrogen from being too concentrated after being discharged from the inside of section 2 412, thereby reducing the pressure loss caused by excessive concentration of compressed air or contaminated nitrogen when contacting with the diverter plate 65, thereby reducing the upper tower pressure and system energy consumption.

[0041] As an embodiment of the present invention, refer to Figure 5 , Figure 6 , Figure 7 and Figure 8The plugging assembly 66 is arranged on the diverter plate 65. The plugging assembly 66 includes a sleeve 661, a rubber ring 662, a first baffle ring 663, a second baffle ring 664 and a second guide tube 665. The sleeve 661 is arranged on the diverter plate 65 and is sleeved with the fixed rod 23. The rubber ring 662 is coaxially arranged inside the sleeve 661 and has a chamfer 6621 on the inner circle of the upper end. The chamfer 6621 has the same cone angle as the second section 412. The first baffle ring 663 is arranged inside the sleeve 661 and is sleeved with the fixed rod 23. The second baffle ring 664 is arranged at the end of the sieve bed 22 and is coaxially sleeved with the diverter plate 65. The upper end inner circle of the second baffle ring 664 is provided with a second chamfer 6621. The ring is provided with a chamfer 3 6641, and a drainage groove 2 66411 is provided on the surface of the chamfer 3 6641. The drainage groove 2 66411 is an arc-shaped groove. One end of the guide pipe 2 665 is connected to the guide pipe 1 5 and communicates with the guide pipe 1 5. The other end of the guide pipe 2 665 penetrates into the interior of the shell 21. The walls of the guide pipe 1 5 and the guide pipe 2 665 can be provided with solenoid valves, which can prevent the compressed air from entering the upper section 1 411 from the upper guide pipe 1 5 after passing through the sieve bed 22, and can also prevent the polluted nitrogen from entering the lower section 1 411 from the lower guide pipe 1 5 after passing through the sieve bed 22.

[0042] Under the above setting conditions, when the molecular sieve purifier 2 is in the regeneration stage, the upper diverter plate 65 contacts the end of the sieve bed 22, while the lower diverter plate 65 is separated from the end of the sieve bed 22. At this time, the upper rubber ring 662 contacts the baffle ring 1 663 to prevent the polluted nitrogen from entering the upper sleeve 661, while the lower rubber ring 662 is separated from the baffle ring 1 663, and the chamfer 2 6621 at the end of the lower rubber ring 662 fits with the surface of the lower segment 2 412 to prevent the polluted nitrogen from entering the segment 2 412 from the drainage groove 1 241 on the surface of the lower conical block 24 after passing through the sieve bed 22, so that the polluted nitrogen can directly flow out from the inside of the corresponding guide pipe 2 665, reducing the pressure loss generated when the polluted nitrogen enters the segment 2 412; when the molecular sieve purifier 2 is in the adsorption stage, the lower diverter plate 65 contacts the end of the sieve bed 22, while the upper diverter plate 65 contacts the sieve bed 22. The ends of the sieve bed 22 are separated. At this time, the lower rubber ring 662 contacts the baffle ring 1 663 to prevent the compressed air from entering the lower sleeve 661, while the upper rubber ring 662 is separated from the baffle ring 1 663, and the chamfer 2 6621 at the end of the upper rubber ring 662 fits with the surface of the upper segment 2 412 to prevent the compressed air from entering the segment 2 412 from the drainage groove 1 241 on the surface of the upper conical block 24 after passing through the sieve bed 22, so that the compressed air can directly flow out from the inside of the corresponding guide pipe 2 665, reducing the pressure loss generated when the compressed air enters the segment 2 412, and after the compressed air or polluted nitrogen passes through the sieve bed 22, most of the airflow can enter the inside of the drainage groove 2 66411 under the pressure of the edge of the diverter plate 65 and form a vortex again, increasing the dynamic pressure of the compressed air or polluted nitrogen, thereby reducing the upper tower pressure and system energy consumption.

[0043] As an embodiment of the present invention, refer to Figure 5 and Figure 6 When the chamfer 4121 is in contact with the surface of the conical block 24, the radial cross-sectional area of ​​the guide tube 5 is smaller than the sum of the notch areas of the exposed drainage groove 241. A plurality of drainage holes 651 are provided inside the diverter plate 65. When the chamfer 4121 is in contact with the surface of the conical block 24, the sum of the radial cross-sectional areas of the plurality of drainage holes 651 is equal to the sum of the notch areas of the exposed drainage groove 241.

[0044] Under the above-mentioned setting conditions, before the compressed air or the contaminated nitrogen enters the molecular sieve purifier 2, the drainage groove 241 and the drainage hole 651 can be used to guide the compressed air or the contaminated nitrogen, and the influence on the pressure of the compressed air or the contaminated nitrogen can be reduced during the guiding process, so that the compressed air or the contaminated nitrogen can smoothly enter the interior of the sieve bed 22, thereby reducing the pressure loss of the compressed air or the contaminated nitrogen caused by the pipeline on the flow path, thereby reducing the upper tower pressure and the system energy consumption.

[0045] As an embodiment of the present invention, refer to Figure 5 The sieve bed 22 is arranged vertically, and the axis of each drainage hole 651 is parallel to the central axis of the sieve bed 22.

[0046] Under the above setting conditions, the drainage holes 651 limit the flow path of the compressed air or the dirty nitrogen when passing through the diverter plate 65. Since the axis of each drainage hole 651 is parallel to the central axis of the sieve bed 22, the compressed air or the dirty nitrogen can enter the interior of the sieve bed 22 along the direction of the central axis of the sieve bed 22, which can prevent the compressed air or the dirty nitrogen from repeatedly impacting the end position of the sieve bed 22 under the action of the irregular flow of the fluid before entering the interior of the sieve bed 22, thereby achieving effective protection of the sieve bed 22, preventing the sieve bed 22 from being pulverized and aggravating the internal blockage after being irregularly impacted by the fluid, and effectively reducing the pressure loss of the compressed air or the dirty nitrogen when flowing inside the sieve bed 22, thereby achieving the effect of reducing the upper tower pressure and the energy consumption of the system.

[0047] Working principle: In order to avoid the moisture, acetylene, carbon dioxide and other hydrocarbons in compressed air and polluted nitrogen from aggravating the blockage of molecular sieve purifier 2, refer to Figure 2 , Figure 3 and Figure 4 , through the swirl blades 43 and the tubular filter 44, after the compressed air or the polluted nitrogen enters the interior of the section 1 411, the swirl effect of the swirl blades 43 can be used to throw the moisture, acetylene, carbon dioxide and other hydrocarbons in the compressed air and the polluted nitrogen onto the tubular filter 44 and filter them under the action of centrifugal force, thereby slowing down the clogging speed of the molecular sieve purifier 2, thereby reducing the upper tower pressure and system energy consumption; in order to avoid the irregular flow of compressed air and polluted nitrogen repeatedly hitting the sieve bed 22, causing the sieve bed 22 to be pulverized and increasing the clogging effect of the sieve bed 22 on the airflow, refer to Figure 2 , Figure 3 and Figure 5 The diverter plate 65 and the plurality of diversion holes 651 provided inside the diverter plate 65 can divert the compressed air or the polluted nitrogen so that the compressed air or the polluted nitrogen enters the sieve bed 22 along the axial direction of the sieve bed 22, thereby avoiding irregular flow of the airflow and repeatedly hitting the sieve bed 22, thereby reducing the pressure loss of the compressed air or the polluted nitrogen when passing through the sieve bed 22, thereby achieving the effect of reducing the upper tower pressure and the system energy consumption; in order to increase the dynamic pressure of the compressed air or the polluted nitrogen after passing through the sieve bed 22 without increasing the energy consumption, refer to Figure 5 , Figure 7 and Figure 8Through the arrangement of the diverter plate 65 and the second drainage groove 66411 opened on the surface of the third chamfer 6641, after the compressed air or the polluted nitrogen passes through the sieve bed 22, due to the distance between the diverter plate 65 and the end of the sieve bed 22, most of the airflow will be pressed into the interior of the second drainage groove 66411 when flowing out at the edge of the diverter plate 65 to form a vortex again, thereby increasing the dynamic pressure of the compressed air or the polluted nitrogen.

[0048] Specifically: the molecular sieve purifier 2 of the present invention includes two stages, namely the adsorption stage (compressed air enters from the bottom of the molecular sieve purifier 2 and flows upward, and finally flows out from the top of the molecular sieve purifier 2) and the regeneration stage (contaminated nitrogen enters from the top of the molecular sieve purifier 2 and flows downward, and finally flows out from the bottom of the molecular sieve purifier 2).

[0049] Adsorption stage: the solenoid valves on the lower guide tube 1 5 and the upper guide tube 2 665 are opened, the solenoid valves on the upper guide tube 1 5 and the lower guide tube 2 665 are closed, and the air compressor 1 works. Before the air compressor 1 works, the electric push rod 7 is started first, and the output end of the electric push rod 7 drives the mounting plate 8 to move upward. The mounting plate 8 drives the two connecting plates 62 to move upward under the action of the guide rod 61. The two connecting plates 62 respectively drive the corresponding diverter plates 65 to move upward under the action of the corresponding connecting rods 63, so that the upper diverter plate 65 is separated from the upper end of the sieve bed 22 and moves along the central axis of the retaining ring 2 664 to the position of the corresponding chamfer 3 6641, and the two sleeves 661 respectively move upward under the action of the corresponding diverter plates 65. At this time, the chamfer 2 6621 on the rubber ring 662 inside the upper sleeve 661 contacts the outer wall of the upper section 2 412, so that the upper sleeve 661 completes the sealing of the upper conical block 24. The compressed air is blocked to prevent the compressed air from entering the interior of the second section 412 after passing through the sieve bed 22. After the compressed air enters the interior of the lower section 1 411 through the lower guide pipe 1 5, it drives the corresponding swirl blade 43 to rotate. When the swirl blade 43 rotates, the compressed air generates a swirl, and under the action of centrifugal force, the water, acetylene, carbon dioxide and other hydrocarbons in the compressed air that have not been filtered out are thrown onto the tubular filter screen 44 for filtration. The compressed air filtered by the tubular filter screen 44 flows out from the drainage groove 1 241 on the surface of the lower conical block 24, and finally passes through the drainage hole 651 opened on the surface of the lower diverter plate 65, and enters the interior of the sieve bed 22 in a direction parallel to the central axis of the sieve bed 22, so as to prevent the irregular flow of the compressed air from repeatedly hitting the sieve bed 22 and causing the sieve bed 22 to be pulverized. While slowing down the blockage of the sieve bed 22, it can effectively reduce the pressure loss generated when the compressed air flows inside the sieve bed 22, thereby reducing the upper tower pressure and system energy consumption;

[0050] Regeneration stage: the solenoid valves on the lower guide tube 1 5 and the upper guide tube 2 665 are closed, the solenoid valves on the upper guide tube 1 5 and the lower guide tube 2 665 are opened, the air compressor 1 stops working, the electric push rod 7 is started, the output end of the electric push rod 7 drives the mounting plate 8 to move downward, the mounting plate 8 drives the two connecting plates 62 to move downward under the action of the guide rod 61, the two connecting plates 62 respectively drive the corresponding diverter plates 65 to move downward under the action of the corresponding connecting rods 63, so that the lower diverter plate 65 is separated from the lower end of the sieve bed 22 and moves along the central axis of the retaining ring 2 664 to the position of the corresponding chamfer 3 6641, and the two sleeves 661 respectively move downward under the action of the corresponding diverter plates 65, at this time, the chamfer 2 6621 on the rubber ring 662 inside the lower sleeve 661 contacts the outer wall of the lower section 2 412, so that the lower sleeve 661 completes the lower conical block 24 The blockage prevents the polluted nitrogen from entering the interior of the second section 412 after passing through the sieve bed 22. After the polluted nitrogen enters the interior of the upper section 1 411 through the upper guide pipe 1 5, it drives the corresponding swirl blade 43 to rotate. When the swirl blade 43 rotates, the polluted nitrogen generates a swirl flow, and under the action of centrifugal force, the water, acetylene, carbon dioxide and other hydrocarbons in the polluted nitrogen that have not been filtered out are thrown onto the tubular filter 44 for filtration. The polluted nitrogen filtered by the tubular filter 44 flows out from the drainage groove 1 241 on the surface of the upper conical block 24, and finally passes through the drainage hole 651 opened on the surface of the upper diverter plate 65, and enters the interior of the sieve bed 22 in a direction parallel to the central axis of the sieve bed 22, so as to prevent the irregular flow of the polluted nitrogen from repeatedly hitting the sieve bed 22 and causing the sieve bed 22 to be pulverized. While slowing down the blockage of the sieve bed 22, it can effectively reduce the pressure loss generated when the polluted nitrogen flows inside the sieve bed 22, thereby reducing the upper tower pressure and system energy consumption.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for reducing the upper tower pressure and system energy consumption of an air separation unit, comprising an air compressor (1), a molecular sieve purifier (2) and a distillation tower (3), characterized in that: The device also comprises a swirl drainage component (4), a guide tube (5), an adjustment component (6), an electric push rod (7) and a mounting plate (8); two swirl drainage components (4) are provided and are respectively provided at the two ends of the molecular sieve purifier (2); two guide tubes (5) are provided and are respectively connected to the corresponding swirl drainage components (4); when compressed air or polluted nitrogen flows through the corresponding swirl drainage component (4), a swirl is formed; the swirl drainage component (4) comprises a tubular filter (44); the tubular filter (44) is provided at one end of the guide tube (5); the central axis of the tubular filter (44) is perpendicular to the central axis of the guide tube (5); the swirl is generated The swirl drainage component (4) throws impurities in the compressed air or dirty nitrogen into the tubular filter (44) by centrifugal force, the regulating component (6) is connected to the two swirl drainage components (4), the electric push rod (7) is arranged outside the molecular sieve purifier (2), the mounting plate (8) is arranged at the output end of the electric push rod (7) and is connected to the regulating component (6), when the electric push rod (7) drives the mounting plate (8) to move upward, the compressed air with impurities removed passes through the molecular sieve purifier (2) from bottom to top along the axial direction, and when the electric push rod (7) drives the mounting plate (8) to move downward, the dirty nitrogen with impurities removed passes through the molecular sieve purifier (2) from top to bottom along the axial direction.

2. The device for reducing the upper tower pressure and system energy consumption of an air separation unit according to claim 1, characterized in that: The swirl drainage assembly (4) further comprises a sleeve (41), a rotating rod (42) and a swirl blade (43); the molecular sieve purifier (2) comprises a housing (21) and a sieve bed (22); the sieve bed (22) is arranged inside the housing (21); the sleeve (41) comprises a first section (411) and a second section (412); the second section (412) is arranged at one end of the first section (411) facing the middle of the housing (21) and is in a truncated cone shape; the diameter of the second section (412) decreases from the end of the housing (21) to the middle of the housing (21); the second section (412) is arranged to be ) has a smaller radial cross-sectional area greater than that of the guide tube one (5); the section one (411) is arranged through the end of the housing (21); the guide tube one (5) is arranged tangentially on the outer surface of the section one (411) and is connected to the interior of the section one (411); the rotating rod (42) is coaxially arranged inside the section one (411); the swirl blade (43) is arranged on the rotating rod (42); the tubular filter screen (44) is arranged inside the section one (411) and is sleeved with the swirl blade (43); and the tubular filter screen (44) is provided with an opening (441).

3. The device for reducing the upper tower pressure and system energy consumption of an air separation unit according to claim 2, characterized in that: The regulating assembly (6) comprises a guide rod (61), a connecting plate (62), a connecting rod (63), a bellows (64), a diverter plate (65) and a blocking assembly (66); the guide rod (61) is arranged to pass through the mounting plate (8); the connecting plate (62) is arranged at the end of the guide rod (61); one end of the connecting rod (63) is arranged on the connecting plate (62) and the other end passes through the interior of the housing (21); the bellows (64) is arranged between the connecting plate (62) and the housing (21) and is sleeved with the connecting rod (63); the diverter plate (65) is coaxially arranged inside the housing (21) and is connected to the connecting rod (63); The molecular sieve purifier (2) further comprises a fixed rod (23) and a conical block (24), wherein the fixed rod (23) is arranged to penetrate the sieve bed (22), the conical block (24) is arranged at the end of the fixed rod (23) and has a plurality of drainage grooves (241) on its surface, the inner circle of the lower port of the section 2 (412) is provided with a chamfer (4121), the angle of the chamfer (4121) being the same as the cone angle of the conical block (24), the blocking component (66) is arranged on the diverter plate (65), and when the diverter plate (65) moves up or down, the blocking component (66) blocks or opens the passage between the drainage groove (241) and the housing (21) respectively.

4. The device for reducing the upper tower pressure and system energy consumption of an air separation unit according to claim 3, characterized in that: The plugging assembly (66) comprises a sleeve (661), a rubber ring (662), a first retaining ring (663), a second retaining ring (664) and a second guide tube (665). The sleeve (661) is arranged on the diverter plate (65) and is sleeved with the fixing rod (23). The rubber ring (662) is coaxially arranged inside the sleeve (661) and has a second chamfer (6621) formed on the inner circle of the upper end. The second chamfer (6621) has the same cone angle as the second section (412). The first retaining ring (663) is arranged on the sleeve (661). The second retaining ring (664) is arranged at the end of the sieve bed (22) and is coaxially sleeved with the diverter plate (65). The inner circle of the upper end of the second retaining ring (664) is provided with a chamfered corner (6641). The surface of the chamfered corner (6641) is provided with a drainage groove (66411). One end of the second guide pipe (665) is connected to the first guide pipe (5) and communicates with the first guide pipe (5). The other end of the second guide pipe (665) passes through the interior of the housing (21).

5. The device for reducing the upper tower pressure and system energy consumption of an air separation unit according to claim 3, characterized in that: The drainage groove 1 (241) is a spiral groove, and the spiral direction of the drainage groove 1 (241) is the same as that of the swirl blade (43). The groove width of the drainage groove 1 (241) gradually increases from the inside to the outside of the section 2 (412).

6. The device for reducing the upper tower pressure and system energy consumption of an air separation unit according to claim 5, characterized in that: When the chamfer 1 (4121) is in contact with the surface of the conical block (24), the radial cross-sectional area of ​​the guide tube 1 (5) is smaller than the sum of the notch areas of the exposed guide groove 1 (241).

7. The device for reducing the upper tower pressure and system energy consumption of an air separation unit according to claim 6, characterized in that: A plurality of drainage holes (651) are provided inside the diverter plate (65), and when the chamfer (4121) is in contact with the surface of the conical block (24), the sum of the radial cross-sectional areas of the plurality of drainage holes (651) is equal to the sum of the notch areas of the exposed drainage groove (241).

8. The device for reducing the upper tower pressure and system energy consumption of an air separation unit according to claim 7, characterized in that: The sieve bed (22) is arranged vertically, and the axis of each drainage hole (651) is parallel to the central axis of the sieve bed (22).

Images