Internal circulation waste gas recycling nitrogen making equipment

Abstract

The invention relates to the technical field of nitrogen making equipment, in particular to internal circulation waste gas recycling nitrogen making equipment which comprises a base, a top plate is fixed to the top of the base, two adsorption towers are fixed to the top face of the top plate, the outer sides of the two adsorption towers are communicated with a gas inlet pipe network, and a gas collecting tank is fixed to the top of the top plate. A conveying mechanism is arranged in the adsorption tower, the conveying mechanism comprises a material conveying barrel fixed to the inner side of the adsorption tower, and an auger is rotationally arranged in the material conveying barrel. According to the device, waste gas with high nitrogen content generated in the later period of purging the adsorption tower by utilizing nitrogen is collected through the gas collection tank, so that the waste gas is conveniently conveyed to the adsorption tower again in the process of subsequently conveying air into the adsorption tower to circularly prepare nitrogen, and a carbon molecular sieve at the bottom in the adsorption tower is conveyed to the top in the adsorption tower through the packing auger; by changing the positions of the carbon molecular sieves in the adsorption tower, the carbon molecular sieves at different positions can uniformly and fully adsorb oxygen in air to prepare nitrogen.

Description

Technical Field

[0001] The invention relates to the technical field of nitrogen production equipment, in particular to nitrogen production equipment using internally circulating waste gas for recycling. Background Art

[0002] The double-tower pressure swing adsorption nitrogen production equipment is a commonly used nitrogen production equipment in the prior art. The equipment mainly includes two adsorption towers. A support net is fixed inside the adsorption tower. A carbon molecular sieve layer is supported and fixed on the support net. Air is transported to the inside of the adsorption tower by an air compressor. Under a certain pressure, the carbon molecular sieve adsorbs more oxygen than nitrogen, which will cause nitrogen in the air to precipitate inside the adsorption tower. After the carbon molecular sieve absorbs oxygen to saturation, the air pressure inside the adsorption tower is reduced to allow the carbon molecular sieve to desorb oxygen for subsequent standby use. The opening and closing of the pneumatic valve is controlled by a programmable control, so that the two towers alternately cycle pressurized adsorption and decompressed desorption to complete oxygen and nitrogen separation, thereby continuously preparing nitrogen of the required purity.

[0003] In the process of decompressing and desorbing oxygen in the adsorption tower, nitrogen is generally introduced into the adsorption tower for purging (also called back-blowing). The back-blowing nitrogen is mixed with the gas in the tower and then discharged out of the tower, which is beneficial to blow the oxygen molecules and other impurity gases remaining in the adsorption tower out of the adsorption tower. In the early stage of nitrogen purging, because the mixed gas discharged from the tower contains more oxygen and other impurity gases, this part of the gas is generally directly discharged to the outside. In the later stage of nitrogen purging, because the impurity gas has been purged in the early stage, the nitrogen content in the mixed gas discharged in the later stage is relatively large, but most nitrogen-making equipment is not easy to recycle the mixed gas in the later stage of purging, resulting in a large amount of nitrogen loss in the purging process. In the prior art, the carbon molecular sieve in the tower is generally fixed on the supporting net, and the carbon molecular sieve that is preferentially in contact with the air will reach the oxygen absorption saturation state faster, which will also make it difficult for the carbon molecular sieves at different positions inside the tower to uniformly adsorb oxygen. Summary of the invention

[0004] The object of the present invention is to provide a nitrogen production device for recycling internally circulating exhaust gas to solve the problems raised in the above-mentioned background technology.

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

[0006] An internally circulating waste gas recycling nitrogen production device, comprising:

[0007] A base, with a top plate fixed on the top of the base;

[0008] There are two adsorption towers fixed on the top surface of the top plate, used for preparing nitrogen;

[0009] An air inlet pipe network is connected and arranged outside the two adsorption towers to transport purified nitrogen-making air to the adsorption towers;

[0010] A gas collecting tank, fixed on the top of the base, is used to collect nitrogen-containing waste gas generated by the nitrogen purge adsorption tower;

[0011] There are two conveying mechanisms, which are used to turn over the position of the carbon molecular sieve inside the adsorption tower. The conveying mechanism includes a conveying cylinder fixed to the inner side of the adsorption tower, and an auger rotates inside the conveying cylinder. The conveying mechanism also includes a transmission cylinder fixed to the top plate, and the transmission cylinder drives the auger to rotate using the airflow delivered by the air intake pipe network;

[0012] There are two pushing mechanisms, which are arranged at the bottom outer side of the corresponding position of the feeding cylinder. They are used to push the carbon molecular sieve into the feeding cylinder and to transport the nitrogen-containing waste gas in the gas collecting tank to the adsorption tower for circulating and preparing nitrogen.

[0013] Furthermore, an exhaust pipe network 1 for conveying nitrogen is provided between the tops of the two adsorption towers, the exhaust pipe network 1 comprises a U-shaped pipe 1, and an L-shaped pipe 1 is connected and fixed to the outer side of the U-shaped pipe 1.

[0014] Furthermore, the invention further comprises two driving mechanisms, which utilize the rotation of the auger to drive the pushing mechanism to operate, and the driving mechanism comprises:

[0015] A transmission wheel is rotatably connected to the top plate via a rotating shaft, and a driving shaft is fixed to the top rim of the transmission wheel;

[0016] A transmission block, a transmission shaft for driving the pushing mechanism is fixed on one side of the transmission block, and an arc-shaped hole groove is formed through the top surface of the transmission block and is slidably connected with the driving shaft;

[0017] The synchronous belt is connected between the transmission wheel and the auger.

[0018] Further, the pushing mechanism comprises:

[0019] A sliding rod is slidably connected to the adsorption tower, and a pushing block is fixed at one end of the sliding rod;

[0020] The sleeve is slidably connected to the slide rod, and a guide plate is fixed at one end of the sleeve.

[0021] Furthermore, one end of the slide rod is provided with an L-shaped hole connected to the sleeve, and the outer side of the gas collecting tank is connected and fixed with a circulation pipe 1 and a circulation pipe 2, and the circulation pipe 1 and the circulation pipe 2 are respectively connected and fixed with the sleeves at corresponding positions.

[0022] Furthermore, one side of the pushing block is provided with an arc-shaped notch, and the top and the bottom of the feeding cylinder are both provided with arc-shaped through holes.

[0023] Further, the air intake network includes:

[0024] L-shaped tubes 2, two in number, are connected and fixed to the adsorption towers at corresponding positions respectively;

[0025] An I-shaped tube, the top of which is connected and fixed to two L-shaped tubes 2, and both ends of the bottom of the I-shaped tube are connected and fixed to special-shaped tubes 1;

[0026] The main pipe is connected and fixed to the middle part of the I-shaped pipe, and the outer side of the main pipe is connected and fixed to the branch pipe.

[0027] Furthermore, two rectangular through holes are symmetrically opened on the outer side of the transmission cylinder, one of the rectangular through holes is connected and fixed with a corresponding position special-shaped tube 1, and the outer side of the other rectangular through hole is connected and fixed with a special-shaped tube 2, and the end of the special-shaped tube 2 passes through the top plate and is connected and fixed with the adsorption tower.

[0028] Furthermore, a plurality of blades are rotated inside the transmission cylinder, and a middle shaft of the auger is fixedly connected to the plurality of blades.

[0029] Preferably, it also includes an exhaust pipe network 2, which is arranged in communication with the two adsorption towers and the rear side of the gas collecting tank, and is used to extract the backwash exhaust gas inside the adsorption tower. The exhaust pipe network 2 includes:

[0030] A vacuum pump, fixedly connected to the top plate;

[0031] The second U-shaped tube is connected and fixed to the suction end of the vacuum pump, the top of the second U-shaped tube is connected and fixed to the third U-shaped tube, the two ends of the third U-shaped tube are respectively connected and fixed to the adsorption tower at the corresponding position, and the outer side of the second U-shaped tube is connected and fixed to the connecting pipe;

[0032] The suction pipe has one end connected and fixed with the exhaust end of the suction pump, and the other end connected and fixed with the gas collecting tank.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. By fixing the feed cylinder inside the adsorption tower, an auger is rotated inside the feed cylinder through the shaft, and a plurality of blades arranged in a circular shape with equal angles are fixed at the bottom of the shaft. The transmission cylinder is sleeved on the outside of the plurality of blades. When the external air compressor delivers air to the adsorption tower with the help of the air intake pipe network, the air will first pass through the transmission cylinder. The driving force of the airflow drives the blades to rotate, so that the shaft drives the auger to rotate. The rotating auger facilitates the transport of the carbon molecular sieve at the bottom of the adsorption tower to the top of the adsorption tower, so that the carbon molecular sieve can be adjusted while adsorbing oxygen in the air under high pressure, preventing the carbon molecular sieve at a local position from always giving priority to adsorbing oxygen and reaching the adsorption saturation state too early, which is beneficial for the carbon molecular sieve inside the adsorption tower to uniformly and fully adsorb oxygen to prepare nitrogen.

[0035] 2. When cleaning the adsorption tower that has desorbed oxygen at low pressure, the external nitrogen source transports nitrogen to the adsorption tower through the air inlet network. The nitrogen purge and the exhaust pipe network 2 can effectively replace the oxygen and other impurity gases remaining in the tower under the desorption state. In the later stage of nitrogen purge, the exhaust pipe network 2 uses a vacuum pump to suck and transport the waste gas containing a large amount of nitrogen into the gas collecting bottle. In the process of injecting air into the adsorption tower, the shaft rod rotating with the help of the airflow will drive the drive mechanism through the pulley and the synchronous belt. The transmission wheel on the drive mechanism drives the slide rod to slide back and forth between the adsorption tower and the sleeve through the transmission block and the drive shaft. The slide rod that slides into the adsorption tower can recycle the nitrogen-containing waste gas in the gas collecting bottle to the adsorption tower through the L-shaped hole and the circulation pipe 1 or the circulation pipe 2 to prepare nitrogen for use, thereby achieving the effect of internal circulation of the nitrogen-containing waste gas to prepare nitrogen again.

[0036] 3. In the process of using the air inlet network to transport nitrogen to the adsorption tower after low-pressure desorption to purge impurity gases, the nitrogen can also drive the shaft to rotate with the auger through the transmission tube. At this time, during the nitrogen purge of the carbon molecular sieve, the carbon molecular sieve is still in a circulating state under the transportation of the auger, which is conducive to fully purging the impurity gases remaining on the carbon molecular sieves at different positions, and to a certain extent optimizes the cleaning effect of the impurity gases between the carbon molecular sieves.

[0037] 4. An arc-shaped through hole is opened on the outside of the bottom of the feeding barrel, a push block is fixed at one end of the slide rod, and an arc-shaped notch is opened on one side of the push block. When the driving mechanism drives the slide rod to slide back and forth to the inside of the adsorption tower to transport the nitrogen-containing waste gas, the slide rod synchronously drives the push block to push the carbon molecular sieve at the bottom of the adsorption tower to the position of the arc-shaped through hole, so that the carbon molecular sieve is pushed into the feeding barrel for the auger to transport the carbon molecular sieve upward;

[0038] By opening an arc-shaped hole groove on the transmission block, when the transmission wheel moves back and forth linearly with the transmission block through the transmission shaft, the transmission shaft that slides to the position of the arc-shaped hole groove will not move linearly with the transmission block, so that the sliding rod pushed into the adsorption tower by the driving mechanism can briefly stay in the adsorption tower for a period of time. During the stay, the pushing block is blocked at the arc-shaped through hole of the feed barrel to prevent the carbon molecular sieve inside the feed barrel from falling back, so that the auger can smoothly transport the carbon molecular sieve upward. At the same time, during the stay, the L-shaped hole on the sliding rod is always connected with the adsorption tower, so that the waste gas in the gas collecting tank can be transported to the adsorption tower for recycling in large quantities. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0040] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0041] Figure 3 It is a schematic diagram of the internal structure of the adsorption tower in the present invention;

[0042] Figure 4 It is a schematic diagram of the bottom structure of the top plate in the present invention;

[0043] Figure 5 It is a sectional view of the adsorption tower and the top plate in the present invention;

[0044] Figure 6 It is a schematic diagram of the structures of the conveying mechanism, the pushing mechanism and the driving mechanism in the present invention;

[0045] Figure 7 It is a schematic diagram of the split three-dimensional state structure of the transmission block and the guide plate in the present invention;

[0046] Figure 8 It is a schematic diagram of the structure of the intake pipe network in the present invention;

[0047] Fig. 9 It is a schematic diagram of the structure of the adsorption tower and the carbon molecular sieve in the present invention.

[0048] In the figure: 100, base; 110, top plate; 200, adsorption tower; 210, exhaust pipe network one; 211, U-shaped pipe one; 212, L-shaped pipe one; 220, cylinder; 300, intake pipe network; 310, L-shaped pipe two; 320, I-shaped pipe; 321, special-shaped pipe one; 330, main pipe; 331, branch pipe; 400, gas collecting tank; 410, circulation pipe one; 420, circulation pipe two; 430, circular seat; 500, conveying mechanism; 510, feeding cylinder; 520, auger; 530, transmission cylinder; 531, blade; 532, rectangular through hole; 533, special-shaped pipe two; 600, pushing mechanism; 610, slide bar; 611, pushing block; 612, L-shaped hole; 620, sleeve; 621, guide plate; 700, driving mechanism; 710, transmission wheel; 711, transmission shaft; 720, transmission block; 721, driving shaft; 722, arc-shaped hole groove; 730, synchronous belt; 731, belt pulley; 800, exhaust pipe network two; 810, air extraction pump; 820, U-shaped pipe two; 821, U-shaped pipe three; 822, connecting pipe; 830, suction pipe. Specific embodiments

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0050] Example 1, please refer to Figure 1- Fig. 9 In an embodiment of the present invention, a nitrogen production device for recycling exhaust gas through internal circulation includes a base 100. A top plate 110 is fixed to the top of the base 100. Two adsorption towers 200 are fixed to the top surface of the top plate 110. An intake pipe network 300 is communicatively connected to the outside of the two adsorption towers 200. The intake pipe network 300 is used to convey air raw materials for preparing nitrogen to the adsorption towers 200. A gas collection tank 400 is fixed to the top of the top plate 110. The gas collection tank 400 is located between the two adsorption towers 200 and is used to collect nitrogen-containing exhaust gas generated by purging the adsorption towers 200 with nitrogen. A conveying mechanism 500 for turning the position of the carbon molecular sieve to evenly adsorb oxygen molecules is arranged inside the adsorption tower 200. The conveying mechanism 500 includes a feeding cylinder 510 fixed to the inner side of the adsorption tower 200. A auger 520 rotates inside the feeding cylinder 510. The conveying mechanism 500 further includes a transmission cylinder 530 fixed to the top plate 110. The transmission cylinder 530 drives the auger 520 to rotate by using the airflow conveyed by the intake pipe network 300. A pushing mechanism 600 is arranged on the outer side of the bottom of the feeding cylinder 510. The pushing mechanism 600 is used to both push the carbon molecular sieve into the feeding cylinder 510 and convey the nitrogen-containing exhaust gas inside the gas collection tank 400 to the adsorption tower 200 for recycling nitrogen production.

[0051] Specifically, a gas collection tank 400 is arranged between the two adsorption towers 200. The gas collection tank 400 is used to collect the exhaust gas with a relatively high nitrogen content generated in the later stage of purging the adsorption towers 200 with nitrogen, which is convenient for recycling the exhaust gas to the adsorption tower 200 for nitrogen production during the subsequent process of conveying air into the adsorption tower 200. A feeding cylinder 510 is installed inside the adsorption tower 200, and an auger 520 rotates inside the feeding cylinder 510. The air entering the adsorption tower 200 from the intake pipe network 300 will drive the blades at the bottom of the shaft rod 531 to rotate, and then the shaft rod will drive the auger 520 to rotate, conveying the carbon molecular sieve at the bottom inside the adsorption tower 200 to the top inside the adsorption tower 200, so as to make the carbon molecular sieves at different positions evenly and fully adsorb oxygen in the air to prepare nitrogen by changing the position of the carbon molecular sieve inside the adsorption tower 200.

[0052] As Figure 1 and Figure 2 shown, in this embodiment, an exhaust pipe network one 210 for conveying nitrogen is communicatively connected between the tops of the two adsorption towers 200. The exhaust pipe network one 210 includes a U-shaped pipe one 211. An L-shaped pipe one 212 is communicatively and fixedly connected to the outside of the U-shaped pipe one 211. The nitrogen alternately prepared by the two adsorption towers 200 will be conveyed along the U-shaped pipe one 211 into the L-shaped pipe one 212, and the L-shaped pipe one 212 is connected to a container for collecting nitrogen outside.

[0053] As Figure 1 - Figure 3As shown, in this embodiment, a port pipe is fixedly connected to the top end of the adsorption tower 200. A cylinder 220 is fixedly installed on the top of the port pipe. The output end of the cylinder 220 is fixedly connected with a piston that is slidably connected to the port pipe. When the adsorption tower 200 needs to be pressurized, the piston can be driven by the cylinder 220 to block the port pipe, preventing the air entering the adsorption tower 200 from entering the inside of the U-shaped pipe 211. When the nitrogen inside the adsorption tower 200 needs to be discharged to the outside, the output end of the cylinder 220 drives the piston to move down to the bottom of the port pipe, enabling the nitrogen to be discharged through the U-shaped pipe 211.

[0054] As Figure 6 and Figure 7 As shown, in this embodiment, there are two driving mechanisms 700, which drive the operation of the pushing mechanism 600 by the rotation of the auger 520. The driving mechanism 700 includes a transmission wheel 710 rotatably connected to the top plate 110 through a rotating shaft. A transmission shaft 711 is fixedly installed on the top edge of the transmission wheel 710. A transmission block 720 is slidably connected to the outside of the transmission shaft 711. One side of the transmission block 720 is fixedly connected with a driving shaft 721 for driving the operation of the pushing mechanism 600. An arc-shaped hole 722 for slidably connecting with the transmission shaft 711 is formed through the top surface of the transmission block 720. Belt pulleys 731 are fixedly sleeved on the outside of the rotating shaft and the shaft rod located inside the top plate 110. A synchronous belt 730 is connected between the two belt pulleys 731.

[0055] In this embodiment, when the air flow passes through the rectangular through holes 532 on both sides of the transmission cylinder 530, it drives the blades 531 at the bottom of the shaft rod to rotate. The blades 531 drive the shaft rod to rotate, and the shaft rod drives the belt pulley 731 on its outside to rotate, causing the synchronous belt 730 to drive the rotating shaft to drive the transmission wheel 710 to rotate. The transmission shaft 711 on the transmission wheel 710 slides on the arc-shaped hole 722. As the transmission wheel 710 rotates, the transmission block 720 linearly reciprocates at the bottom of the guide plate 621. Furthermore, the transmission block 720 drives the sliding rod 610 to linearly reciprocate inside the sleeve 620 through the transmission shaft 711.

[0056] As Figure 7 As shown, in this embodiment, by setting the arc-shaped hole 722 to be arc-shaped, and the center of the arc corresponding to the arc-shaped hole 722 is on the rotation axis of the transmission wheel 710. When the transmission wheel 710 drives the transmission shaft 711 to rotate to the position of the arc-shaped hole 722, the transmission shaft 711 slides on the arc-shaped hole 722 without driving the transmission block 720 to linearly move. When the transmission shaft 711 is transmitted to the extension groove positions at both ends of the arc-shaped hole 722, the transmission shaft 711 drives the transmission block 720 in a direction away from the adsorption tower 200 as the transmission wheel 710 rotates. Thus, during the reciprocating linear movement of the transmission block 720, it stays for a different period of time after the sliding rod 610 moves into the adsorption tower 200, allowing the sliding rod 610 to convey the waste gas into the adsorption tower 200.

[0057] like Figure 6 and Figure 7 As shown, in this embodiment, the pushing mechanism 600 includes a sliding rod 610 slidably connected to the adsorption tower 200, a pushing block 611 is fixed to one end of the sliding rod 610, a sleeve 620 is fixed to the outside of the adsorption tower 200, one end of the sleeve 620 is sealed, and the sliding rod 610 is slidably connected to the sleeve 620.

[0058] In this embodiment, the driving mechanism 700 drives the slide rod 610 to slide linearly reciprocatingly inside the sleeve 620 through the driving shaft 721. After the slide rod 610 slides into the adsorption tower 200, the pushing block 611 on the slide rod 610 pushes the carbon molecular sieve into the feed cylinder 510 and blocks the arc-shaped through hole at the bottom of the feed cylinder 510, so that the feed cylinder 510 can transport the carbon molecular sieve out of the arc-shaped through hole at the top of the feed cylinder 510. At the same time, the gas collecting tank 400 can transport the exhaust gas to different sleeves 620 through two circulation pipes, and the exhaust gas inside the sleeve 620 is transported to the adsorption tower 200 through the L-shaped hole 612.

[0059] like Figure 7 As shown, in this embodiment, a guide plate 621 is fixed to one end of the sleeve 620, and a slider slidably engaged with the guide plate 621 is fixed to the top surface of the transmission block 720, so that the transmission block 720 can move linearly and reciprocatingly smoothly.

[0060] like Figure 1 As shown, in this embodiment, a circular seat 430 is fixed at the bottom of the gas collecting tank 400, the circular seat 430 is fixedly connected to the corresponding position sleeve 620, and the sleeve 620 is fixedly connected to the corresponding position adsorption tower 200, so that the gas collecting tank 400 is firmly and stably supported and fixed above the top plate 110.

[0061] like Figure 2 , Figure 5 and Figure 6 As shown, in this embodiment, an L-shaped hole 612 connected to the sleeve 620 is opened at one end of the sliding rod 610, and the outer side of the gas collecting tank 400 is connected and fixed with a circulation pipe 1 410 and a circulation pipe 2 420, and the circulation pipe 1 410 and the circulation pipe 2 420 are respectively connected and fixed to the sleeve 620 at the corresponding position.

[0062] In this embodiment, the gas collecting tank 400 can transport exhaust gas to the adsorption tower 200 at different positions. A solenoid valve can be installed inside the L-shaped hole 612. When air is first transported to the adsorption tower 200, the air pressure inside the adsorption tower 200 is relatively low. At this time, opening the solenoid valve can allow the high-pressure exhaust gas stored inside the gas collecting tank 400 to be automatically transported to the adsorption tower 200 through the L-shaped hole 612. Later, when the air pressure inside the adsorption tower 200 is relatively high, the solenoid valve can be closed to prevent the air inside the adsorption tower 200 from leaking out from the L-shaped hole 612.

[0063] like Figure 7 As shown, in this embodiment, an arc-shaped notch is opened on one side of the pushing block 611, and arc-shaped through holes are opened on the top and bottom of the feeding cylinder 510, so that the arc-shaped notch of the pushing block 611 can push a large amount of carbon molecular sieve into the feeding cylinder 510, and then block the arc-shaped through holes of the feeding cylinder 510.

[0064] like Figure 1 and Figure 8 As shown, in this embodiment, the air intake network 300 includes two L-shaped tubes 310 respectively connected and fixed to the adsorption towers 200 at corresponding positions, an I-shaped tube 320 is connected and fixed between the two L-shaped tubes 310, both ends of the bottom of the I-shaped tube 320 are connected and fixed to a special-shaped tube 321, the middle of the I-shaped tube 320 is connected and fixed to a main pipe 330, and the outer side of the main pipe 330 is connected and fixed to a branch pipe 331.

[0065] In this embodiment, when it is necessary to transport air into the adsorption tower 200, the air transport pipeline of the external air compressor is connected and fixed to one end of the main pipe 330, the valve installed on the branch pipe 331 is closed, the valve on the main pipe 330 is opened, and the valve at the bottom of the I-shaped pipe 320 is opened, so that the air is selectively transported to the two special-shaped pipes 1 321 through the main pipe 330 and the I-shaped pipe 320 in turn, and then transported to the corresponding position of the adsorption tower 200 through the transmission cylinder 530 and the special-shaped pipe 2 533. When nitrogen is transported to purge the adsorption tower 200, the valve at one end of the main pipe 330 can be closed, and then the valve on the branch pipe 331 can be opened, and nitrogen is transported to the main pipe 330 through the branch pipe 331. Similarly, it is transported to the corresponding position of the adsorption tower 200 through the I-shaped pipe 320 and the two special-shaped pipes 1 321.

[0066] like Figure 4 and Figure 6 As shown, in this embodiment, two rectangular through holes 532 are symmetrically opened on the outer side of the transmission cylinder 530, one rectangular through hole 532 is connected and fixed with the corresponding position of the special-shaped tube 1 321, and the other rectangular through hole 532 is connected and fixed with the special-shaped tube 2 533 on the outer side, and the special-shaped tube 2 533 passes through the end of the top plate 110 and is connected and fixed with the adsorption tower 200, so that the air in the special-shaped tube 1 321 is transported to the transmission cylinder 530, and then transported to the inside of the adsorption tower 200 through the special-shaped tube 2 533.

[0067] like Figure 6 As shown, in this embodiment, a plurality of blades 531 rotate inside the transmission cylinder 530, and a central shaft of the auger 520 is fixedly connected to the plurality of blades 531, so that the airflow driving the blades 531 to rotate will cause the shaft to drive the auger 520 to rotate.

[0068] Embodiment 2. On the basis of Embodiment 1, in order to suck the nitrogen-containing waste gas generated by the purge adsorption tower 200 into the gas collection tank 400 for subsequent recycling.

[0069] As Figure 2 shown, in this embodiment, the exhaust pipe network II 800 is connected and arranged at the rear side of the two adsorption towers 200 and the gas collection tank 400 for exhausting the backflush waste gas inside the adsorption tower 200. The exhaust pipe network II 800 includes an air extraction pump 810 fixedly connected to the top plate 110. The suction end of the air extraction pump 810 is fixedly connected and communicated with a U-shaped pipe II 820. The top end of the U-shaped pipe II 820 is fixedly connected and communicated with a U-shaped pipe III 821. Both ends of the U-shaped pipe III 821 are fixedly connected and communicated with the adsorption tower 200 at the corresponding positions. A connecting pipe 822 is fixedly connected and communicated with the outside of the U-shaped pipe II 820. The exhaust end of the air extraction pump 810 is fixedly connected and communicated with a suction pipe 830. One end of the suction pipe 830 away from the air extraction pump 810 is fixedly connected and communicated with the gas collection tank 400.

[0070] Specifically, at the beginning, a large amount of impurity gases such as oxygen are mixed in the nitrogen blown into the adsorption tower 200. At this time, the air extraction pump 810 directly discharges the waste gas through the U-shaped pipe III 821, the U-shaped pipe II 820 and the connecting pipe 822. When the gas blown out of the adsorption tower 200 can only have a large nitrogen content in the later stage, the air extraction pump 810 transports the waste gas into the gas collection tank 400 through the U-shaped pipe III 821, the U-shaped pipe II 820 and the suction pipe 830 for storage. Among them, when it is necessary to suck the nitrogen-containing waste gas inside the adsorption tower 200 at different positions, the valve on the U-shaped pipe III 821 close to the adsorption tower 200 at this position can be opened in advance. When it is necessary to store the waste gas into the gas collection tank 400, the valve on the suction pipe 830 is opened and the valve on the connecting pipe 822 is closed.

[0071] In the present invention, the exhaust pipe network I 210, the intake pipe network 300 between the two adsorption towers, and the valves installed on the pipelines are all prior arts in the preparation of nitrogen by pressure swing adsorption of double towers. Refer to the specification Figure 3 , the two adsorption towers 200 are respectively marked as Tower A and Tower B. For example, when Tower A adsorbs oxygen, the valves at positions a, c, g, f, and i are opened, and the valves at the remaining positions are closed. The air entering Tower A is adsorbed by the carbon molecular sieve under high pressure to adsorb oxygen, and the generated nitrogen is discharged from the left end of the U-shaped pipe I 211 and the L-shaped pipe I 212; when the pressure in Tower A is equalized to make the pressures of the two towers the same, the valves at positions a, b, d, and j are opened, and the valves at the remaining positions are closed to reduce the impact of the carbon molecular sieve inside the adsorption tower during switching; when the oxygen desorbed at low pressure in Tower A is vented, the air extraction pump 810 of the exhaust pipe network II 800 is used to suck the gas, which can accelerate the gas discharge; the above operating principle of Tower B is the same as that of Tower A, except that the opened and closed valves are different. The specific opened and closed valves make the pipelines at different positions intake and exhaust gas to complete the working principle of preparing nitrogen by pressure swing adsorption of Tower A and Tower B, which is a prior art, and the specific working principle will not be elaborated.

[0072] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0073] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An internally circulating waste gas recycling nitrogen production equipment, characterized in that: Comprising: A base (100) with a top plate (110) fixedly attached to the top of the base (100); Two adsorption towers (200) fixedly mounted on the top surface of the top plate (110) for nitrogen production; An intake pipe network (300) communicatively arranged outside the two adsorption towers (200) for delivering purified nitrogen-producing air to the adsorption towers (200); A gas collection tank (400) fixed to the top of the base (100) for collecting nitrogen-containing waste gas generated by purging the adsorption towers (200) with nitrogen; Two conveying mechanisms (500) for turning the position of the carbon molecular sieve inside the adsorption towers (200). The conveying mechanism (500) includes a feeding cylinder (510) fixedly attached to the inner side of the adsorption tower (200), and a screw conveyor (520) rotatably disposed inside the feeding cylinder (510). The conveying mechanism (500) further includes a transmission cylinder (530) fixedly attached to the top plate (110), and the transmission cylinder (530) drives the screw conveyor (520) to rotate by means of the airflow conveyed by the intake pipe network (300); Two pushing mechanisms (600) respectively arranged outside the bottom of the corresponding feeding cylinders (510), which are used to push the carbon molecular sieve into the feeding cylinder (510) and to convey the nitrogen-containing waste gas inside the gas collection tank (400) to the adsorption tower for cyclic nitrogen production.

2. The internally circulating exhaust gas recycling nitrogen production equipment according to claim 1 is characterized in that: A first exhaust pipe network (210) for nitrogen conveyance is communicatively arranged between the tops of the two adsorption towers (200). The first exhaust pipe network (210) includes a U-shaped pipe one (211), and an L-shaped pipe one (212) is communicatively and fixedly attached to the outside of the U-shaped pipe one (211).

3. The internal circulation exhaust gas recycling nitrogen production equipment according to claim 1 is characterized in that: It further includes two driving mechanisms (700) that drive the pushing mechanism (600) to operate by means of the rotation of the screw conveyor (520). The driving mechanism (700) includes: A transmission wheel (710) rotatably connected to the top plate (110) through a rotating shaft, and a transmission shaft (711) is fixedly attached to the top rim of the transmission wheel (710); A transmission block (720) with a driving shaft (721) for driving the pushing mechanism (600) fixedly attached to one side thereof. An arc-shaped hole groove (722) slidably connected to the transmission shaft (711) is formed through the top surface of the transmission block (720); A synchronous belt (730) is drivingly connected between the transmission wheel (710) and the screw conveyor (520).

4. The internally circulating exhaust gas recycling nitrogen production equipment according to claim 1 is characterized in that: It further includes a second exhaust pipe network (800) communicatively arranged at the rear sides of the two adsorption towers (200) and the gas collection tank (400) for exhausting the backwashing waste gas inside the adsorption towers (200). The second exhaust pipe network (800) includes: An air extraction pump (810) fixedly connected to the top plate (110); A U-shaped pipe two (820) communicatively and fixedly attached to the suction end of the air extraction pump (810). The top end of the U-shaped pipe two (820) is communicatively and fixedly attached to a U-shaped pipe three (821), and the two ends of the U-shaped pipe three (821) are respectively communicatively and fixedly attached to the corresponding adsorption tower (200). A connecting pipe (822) is communicatively and fixedly attached to the outside of the U-shaped pipe two (820); An extraction pipe (830) with one end communicatively and fixedly attached to the exhaust end of the air extraction pump (810) and the other end communicatively and fixedly attached to the gas collection tank (400).

5. The internally circulating exhaust gas recycling nitrogen production equipment according to claim 1 is characterized in that: The pushing mechanism (600) comprises: A sliding rod (610) is slidably connected to the adsorption tower (200), and a pushing block (611) is fixed to one end of the sliding rod (610); The sleeve (620) is slidably connected to the slide rod (610), and a guide plate (621) is fixed to one end of the sleeve (620).

6. The internally circulating exhaust gas recycling nitrogen production equipment according to claim 5 is characterized in that: An L-shaped hole (612) communicating with the sleeve (620) is formed at one end of the sliding rod (610); a circulation pipe 1 (410) and a circulation pipe 2 (420) are connected and fixed to the outside of the gas collecting tank (400); and the circulation pipe 1 (410) and the circulation pipe 2 (420) are respectively connected and fixed to the sleeves (620) at corresponding positions.

7. The internally circulating exhaust gas recycling nitrogen production equipment according to claim 6 is characterized in that: An arc-shaped notch is provided on one side of the pushing block (611), and arc-shaped through holes are provided on the top and bottom of the feeding cylinder (510).

8. The internally circulating exhaust gas recycling nitrogen production equipment according to claim 1 is characterized in that: The air intake network (300) includes: L-shaped tubes 2 (310), two in number, are connected and fixed to the adsorption towers (200) at corresponding positions respectively; The top of the I-shaped tube (320) is connected and fixed to the two L-shaped tubes (310), and both ends of the bottom of the I-shaped tube (320) are connected and fixed to the special-shaped tube (321); The main pipe (330) is connected and fixed to the middle of the I-shaped pipe (320), and the outer side of the main pipe (330) is connected and fixed to a branch pipe (331).

9. The internally circulating exhaust gas recycling nitrogen production equipment according to claim 8, characterized in that: Two rectangular through holes (532) are symmetrically formed on the outer side of the transmission cylinder (530); one rectangular through hole (532) is connected and fixed to a corresponding position of a shaped tube 1 (321); and the outer side of the other rectangular through hole (532) is connected and fixed to a shaped tube 2 (533); the shaped tube 2 (533) passes through the end of the top plate (110) and is connected and fixed to the adsorption tower (200).

10. The internally circulating exhaust gas recycling nitrogen production equipment according to claim 9, characterized in that: A plurality of blades (531) are rotatably disposed inside the transmission cylinder (530), and a central shaft of the auger (520) is fixedly connected to the plurality of blades (531).

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