Anti-cracking and anti-bulging supercritical N2 safe discharging device

Abstract

The invention discloses an anti-cracking and anti-bulging supercritical N2 safe discharge device, and relates to the technical field of N2 discharge, the anti-cracking and anti-bulging supercritical N2 safe discharge device comprises an exhaust pipe, an exhaust groove, a buffer pipe, a silencer and an adsorption structure; the exhaust groove is formed below soil and used for storing the buffer pipe, a cement cover plate is arranged at the top of the exhaust groove, and the surface of the cement cover plate is covered with soil. One end of the exhaust pipe is communicated with the buffer pipe, and the other end of the exhaust pipe is connected with an exhaust port of the high-pressure reaction kettle; the buffer pipe and the silencing device are used for carrying out superposed noise reduction on noise generated by N2 emission, noise pollution is greatly reduced, an activated carbon layer is arranged to adsorb and filter a cross-linking agent in N2 to avoid air pollution, and the buffer pipe is arranged to avoid pollution caused by direct contact between N2 and soil.

Description

Technical Field

[0001] The present invention relates to the technical field of N2 emission, and more particularly to a crack-proof and bulging-proof supercritical N2 safety emission device. Background Art

[0002] Supercritical gas foaming is a physical foaming technology. The supercritical gas foaming process offers advantages such as cleanliness, environmental friendliness, and excellent foaming performance. The application of supercritical gas foamed shoe materials is particularly mature. Currently, supercritical nitrogen foaming is a common supercritical gas foaming method. Liquid nitrogen is obtained through procurement or nitrogen generators, then converted into gaseous nitrogen. The pressurized gaseous nitrogen enters a high-pressure reactor and is immersed in the sole foam material, causing it to expand to saturation. The nitrogen is then rapidly released to solidify the sole foam material.

[0003] The production of shoe sole foaming materials produces chemical residues such as crosslinking agents. The high reaction temperature and pressure in the autoclave cause these chemical residues to mix with nitrogen dioxide in the form of gas. Currently, when dealing with nitrogen dioxide emissions, a 20-meter-long underground exhaust trench with a cement mortar layer on the inner wall is dug. N2 is then connected to the exhaust trench through the autoclave exhaust pipe. This approach has the following disadvantages: The high-pressure nitrogen dioxide gas emits noise pollution, and the soil above the exhaust trench will crack, bulge, and collapse over time. Furthermore, crosslinking agents entering the soil can easily cause soil and water pollution. Untreated crosslinking agents are directly discharged into the air, causing environmental pollution. Therefore, a safe nitrogen dioxide emission device is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a crack-proof and anti-bulging supercritical N2 safety discharge device in order to solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A crack and bulge-proof supercritical N2 safety discharge device, comprising an exhaust pipe, an exhaust trough, a buffer pipe, a silencer and an adsorption structure;

[0007] The exhaust trough is set under the soil for storing the buffer tube, and the top of the exhaust trough is provided with a cement cover plate, and the surface of the cement cover plate is covered with soil;

[0008] One end of the exhaust pipe is connected to the buffer pipe, and the other end is connected to the exhaust port of the high-pressure reactor. An exhaust valve is provided on the exhaust pipe;

[0009] The silencer includes a tube body and sound-absorbing cotton arranged in the interlayer of the tube body. A top tube is provided on the top of the tube body and a bottom tube is provided on the bottom. The bottom of the bottom tube is connected to the buffer tube through a connecting tube. A card slot is formed on the inner wall of the tube body. The card slot is composed of two symmetrically arranged L-shaped card strips with a cross section. The card slot is used to cooperate with the insertion of the adsorption structure.

[0010] The adsorption structure includes an adsorption slot that is inserted into the card slot, an activated carbon layer filled in the interlayer of the adsorption slot, and a bottom plate fixedly installed at the bottom of the adsorption slot. An adsorption hole is provided on the side of the adsorption slot close to the slot opening of the card slot, and a socket for inserting the adsorption slot is provided at the bottom of the tube body. The bottom plate is connected to the tube body with screws.

[0011] The distance between the bottom plate and the ground is greater than the height of (the adsorption tank + the bottom plate). A support frame is provided on the outer wall of the tube body to secure the tube body and elevate the tube body. The height of the bottom plate from the ground is greater than the height of (the adsorption tank + the bottom plate) in order to facilitate removal of the adsorption tank from the bottom of the tube body for replacement.

[0012] There are four card slots, which are evenly spaced along the inner wall of the tube body.

[0013] There are three silencers, and setting three groups of silencers can improve the silencing effect.

[0014] The exhaust trough wall is provided with a cement mortar layer, a waterproof and moisture-proof coating layer, a sound-absorbing layer and an adsorption coating layer from the inside to the outside. The provision of the waterproof and moisture-proof coating layer plays a role in waterproofing and moisture-proofing, keeping the exhaust trough dry and preventing the buffer tube from getting damp and rusting; the sound-absorbing coating is a sound-absorbing coating coating; the adsorption coating is a nano-alumina adsorbent coating, and the nano-alumina adsorbent can be used to adsorb chemical residues such as cross-linking agents in the air. Alumina has a large specific surface area and a rich microporous structure, which gives it excellent adsorption properties. When chemical residues in the air come into contact with the surface of the alumina adsorbent, they will be adsorbed to the micropores and active sites on the surface of the alumina, and thus be effectively removed. The purpose of the design of the adsorption coating is to prevent the cross-linking agent in the buffer tube from leaking into the exhaust trough and causing soil pollution.

[0015] A shock-absorbing silicone PU elastic layer is applied to the bottom of the exhaust trough over the adsorption coating. This layer is in contact with the buffer tube. This layer provides excellent shock absorption, wear resistance, and pressure resistance. While N2 exhaust impacts the buffer tube, the impact energy is largely absorbed by the silicone PU elastic layer, preventing damage to the exhaust trough bottom.

[0016] Specifications of the buffer tube: length 10-15 meters, diameter 0.5-1 meter, wall thickness not less than 0.5 cm, and the material can be selected from one of carbon steel, stainless steel, nickel alloy, and titanium alloy. Experimental tests have shown that the use of the buffer tube specifications of the present invention can directly reduce noise by 60% compared with N2 directly coming out of the exhaust pipe. If carbon steel is used, the inner wall of the buffer tube needs to be sprayed with a layer of anti-corrosion material to extend the service life of the pipeline.

[0017] The shock-absorbing silicon PU elastic layer is provided with an integrally formed groove layer, which is used to increase the contact area between the shock-absorbing silicon PU elastic layer and the buffer tube and reduce the deformation of the shock-absorbing silicon PU elastic layer. The thickness of the shock-absorbing silicon PU elastic layer satisfies the following relationship: D = d1 + d2, where D is in cm, d1 = k*d3, k = 2*r / L, r is the outer diameter of the buffer tube, r ranges from 0.5 to 1m, L is the width of the groove layer notch, L ranges from (0.67 to 0.7)*2r, d3 is the wall thickness of the buffer tube, and d3 ranges from

[0018] 0.5-0.7cm; d2=2*d3.

[0019] Working Principle: During exhaust, the exhaust valve is opened, and N2 enters the buffer pipe through the exhaust pipe. The buffer pipe performs an initial release of N2. The buffer pipe isolates the high-pressure N2 from the soil, preventing it from causing cracking, bulging, collapse, and contamination. The buffer pipe is located underground. The soil itself has a certain sound insulation effect, and the sound-absorbing layer also has a sound-absorbing effect, which greatly reduces the noise generated by N2. The buffered N2 enters the silencer through the connecting pipe. The silencer performs secondary noise reduction and chemical filtration on the N2. Specifically, the sound-absorbing cotton silences the N2, and the cross-linking agent is absorbed by the activated carbon layer through the adsorption holes, ensuring that clean N2 is discharged from the top pipe to avoid atmospheric pollution. It should be noted that directly emitting clean N2 and within a certain emission range meets environmental requirements.

[0020] The beneficial effects of the present invention are as follows:

[0021] The buffer tube and silencer of the present invention superimpose noise reduction on the noise generated by N2 emissions, greatly reducing noise pollution. The setting of the activated carbon layer adsorbs and filters the cross-linking agent in N2 to avoid polluting the atmosphere. The setting of the buffer tube prevents N2 from directly contacting the soil and causing pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation structure of the silencer;

[0024] Figure 3 yes Figure 2 Cross-sectional view in the AA direction;

[0025] Figure 4 It is a structural diagram of the adsorption structure;

[0026] Figure 5 yes Figure 2 Bottom view of the middle tube;

[0027] Figure 6This is a schematic diagram of the structure in which the hanging ears are provided on the pipe body and the separation holes are provided on the support frame;

[0028] Figure 7 It is a structural schematic diagram of the tube transfer device;

[0029] Figure 8 This is a schematic diagram of the installation of the support plate, support cylinder and separation rod structure;

[0030] Figure 9 It is a structural diagram of the shock-absorbing silicon PU elastic layer.

[0031] Figure numerals: 1. exhaust pipe; 2. exhaust groove; 3. buffer pipe; 4. silencer; 5. soil; 6. cement cover; 7. exhaust valve; 8. pipe body; 9. sound-absorbing cotton; 10. top pipe; 11. bottom pipe; 12. connecting pipe; 13. clamping strip; 14. adsorption groove; 15. activated carbon layer; 16. bottom plate; 17. adsorption hole; 18. support frame; 19. cement mortar layer; 20. waterproof and moisture-proof coating layer; 21. sound-absorbing layer; 22. adsorption coating; 23. shock-absorbing silicon PU elastic layer; 24. frame; 25. universal wheel; 26. lifting cylinder; 27. hanging rope; 28. perforation; 29. ​​hook; 30. hanging ear; 31. support plate; 32. support cylinder; 33. separation rod; 34. separation cylinder; 35. separation hole; 36. weight block; 36. groove layer. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figures 1 to 9 As shown, this embodiment provides a crack and bulge-proof supercritical N2 safety discharge device, including an exhaust pipe 1, an exhaust groove 2, a buffer pipe 3, a silencer 4 and an adsorption structure;

[0036] The exhaust trough 2 is provided below the soil 5 for storing the buffer tube 3. A cement cover plate 6 is provided on the top of the exhaust trough 2. The surface of the cement cover plate 6 is covered with soil 5.

[0037] One end of the exhaust pipe 1 is connected to the buffer pipe 3 and the other end is connected to the exhaust port of the high-pressure reactor. The exhaust pipe 1 is provided with an exhaust valve 7;

[0038] The silencer 4 includes a tube body 8 and a sound-absorbing cotton 9 arranged in the interlayer of the tube body 8. A top tube 10 is provided on the top of the tube body 8 and a bottom tube 11 is provided on the bottom. The bottom of the bottom tube 11 is connected to the buffer tube 3 through a connecting tube 12. A card groove is formed on the inner wall of the tube body 8. The card groove is composed of two symmetrically arranged L-shaped card strips 13 with a cross section. The card groove is used to cooperate with the insertion of the adsorption structure.

[0039] The adsorption structure includes an adsorption tank 14 that is inserted into the card slot, an activated carbon layer 15 filled in the interlayer of the adsorption tank 14, and a bottom plate 16 fixedly installed at the bottom of the adsorption tank 14. The adsorption tank 14 is provided with an adsorption hole 17 on one side close to the card slot, and the bottom plate 16 is screwed to the tube body 8. Figure 5 The bottom of the tube body 8 is provided with a socket for inserting the adsorption groove 14, which is not shown in the figure. The adsorption groove 14 is inserted into the tube body 8 through the socket, and the bottom plate 16 is fixed to the bottom of the tube body 8 by screws.

[0040] The outer wall of the tube body 8 is provided with a support frame 18, the top of the support frame 18 is bolted to the tube body 8, and the bottom of the support frame 18 is fixed to the ground;

[0041] The discharge device also includes a pipe body transfer device, which includes:

[0042] A frame 24, wherein a universal wheel 25 is provided at the bottom of the frame 24;

[0043] A lifting device, used to lift and transfer the pipe body 8;

[0044] The support device supports the bottom of the tube body 8, making it easier for the staff to separate the support frame 18 from the tube body 8 to prevent the tube body 8 from falling;

[0045] The separation device is used to separate the support frame 18 from the tube body 8 to avoid friction between the support frame 18 and the side wall of the tube body 8 when the tube body 8 is raised and transferred. The tube body 8 needs to be maintained and replaced after a period of use. The tube body 8 is large in size and faces many problems in transferring the tube body 8. For example, when the bolts on the top of the support frame 18 are removed, there is a lack of a support device at the bottom of the tube body 8 to prevent the tube body 8 from falling. In addition, the tube body 8 needs to be raised and transferred after the bolts are removed. However, since the support frame 18 is set at an angle and has a heavy mass, if the tube body 8 is directly raised and transferred, the corners on the top of the support frame 18 will scratch the outer wall of the tube body 8. Over time, the tube body 8 is prone to wear. Therefore, there is a lack of a support frame 18 separation device when the tube body 8 is raised and transferred. There is no targeted tube body 8 transfer device designed for the transfer of the tube body 8 in the prior art. The tube body 8 transfer device in the present invention meets the requirements of solving the above-mentioned technical problems.

[0046] The lifting device includes two groups of lifting cylinders 26, the output ends of the lifting cylinders 26 are connected to hanging ropes 27, the lifting cylinders 26 are fixedly mounted on the top of the frame 24, the top of the frame 24 is provided with a through hole 28, the bottom end of the hanging rope 27 passes through the through hole 28 and is fixedly connected to a hook 29, and the side wall of the tube body 8 is provided with two hanging ears 30, which are cooperated and connected with the hook 29.

[0047] The supporting device includes two groups of supporting plates 31 , which are welded to the frame 24 , and support cylinders 32 are installed on the supporting plates 31 .

[0048] The separation device includes two sets of separation rods 33, one end of the separation rod 33 is hinged to the frame 24, and a separation cylinder 34 is provided on the frame 24, one end of the separation cylinder 34 is hinged to the frame 24, and the output end of the separation cylinder 34 is hinged to the separation rod 33;

[0049] The support frame 18 is provided with a separation hole 35 , and the separation hole 35 is inserted in cooperation with the separation rod 33 .

[0050] In the present invention, the steps of transferring the tube body 8 include the following:

[0051] Step 1: Move the frame 24 to move the support cylinder 32 to the bottom of the tube 8, insert the separation rod 33 into the separation hole 35, and then connect the hook 29 with the hanging ear 30;

[0052] Step 2, unscrew the bolts between the support frame 18 and the tube body 8;

[0053] Step 3: The working output end of the separation cylinder 34 extends outward, causing the separation rod 33 to rotate outward, so that the support frame 18 is away from the tube body 8;

[0054] Step 4: The lifting cylinder 26 works to drive the pipe body 8 upward, and at the same time, the supporting cylinder 32 is lifted upward. The supporting cylinder 32 and the lifting cylinder 26 cooperate to bring the pipe body 8 away from the support frame 18;

[0055] Step 5: After the bottom of the tube body 8 is completely separated from the support frame 18, the output end of the support cylinder 32 is retracted, the separation cylinder 34 is retracted, and finally the transfer frame 24 is used to move the tube body 8 to the destination for cleaning.

[0056] The bottom of the tube 8 is provided with a positioning slot (not shown), which engages with the output end of the support cylinder 32. The purpose of the positioning slot is to facilitate the positioning of the output end of the support cylinder 32 on the bottom of the tube 8. The support cylinder 32 also cooperates with the lifting cylinder 26 to ensure that the tube 8 rises while preventing the tube 8 from colliding with the support frame 18. A load block 36 is provided at the bottom of the frame 24 to ensure the frame's balance.

[0057] The distance between the bottom plate 16 and the ground is greater than the height of (the adsorption tank 14 + the bottom plate 16). A support frame 18 is provided on the outer wall of the tube body 8. The support frame 18 is provided to fix the tube body 8 and to elevate the tube body 8. The height of the bottom plate 16 from the ground is greater than the height of (the adsorption tank 14 + the bottom plate 16) in order to facilitate the removal of the adsorption tank 14 from the bottom of the tube body 8 for replacement.

[0058] There are four card slots and they are evenly spaced along the inner wall of the tube body 8 .

[0059] There are three silencers 4. Providing three groups of silencers 4 can improve the silencing effect.

[0060] The walls of the exhaust trough 2 are sequentially coated, from the inside out, with a cement mortar layer 19, a waterproof and moisture-proof coating layer 20, a sound-absorbing layer 21, and an adsorption coating 22. The waterproof and moisture-proof coating layer 20 provides a waterproof and moisture-proof effect, keeping the exhaust trough 2 dry and preventing dampness and rust in the buffer tube 3. The sound-absorbing coating is a sound-absorbing coating. The adsorption coating 22 is a nano-alumina adsorbent coating. The nano-alumina adsorbent can be used to absorb chemical residues such as crosslinking agents in the air to prevent sudden contamination caused by leakage of the buffer tube 3. Alumina has a large specific surface area and a rich microporous structure, which gives it excellent adsorption properties. When chemical residues in the air come into contact with the surface of the alumina adsorbent, they are adsorbed to the micropores and active sites on the alumina surface, effectively removing them. The adsorption coating 22 is designed to prevent crosslinking agents in the buffer tube 3 from leaking into the exhaust trough 2 and contaminating the soil 5.

[0061] A shock-absorbing silicone PU elastic layer 23 is applied to the bottom of the exhaust groove 2 on the adsorption coating 22. This layer is in contact with the buffer tube 3. This layer 23 offers excellent shock absorption, wear resistance, and pressure resistance. While N2 exhaust impacts the buffer tube 3, the impact energy is largely absorbed by the layer, preventing damage to the bottom of the exhaust groove 2.

[0062] Specifications of the buffer tube 3: length 10-15 meters, diameter 0.5-1 meter, wall thickness not less than 0.5 cm, and the material can be selected from one of carbon steel, stainless steel, nickel alloy, and titanium alloy. Experimental tests have shown that the use of the buffer tube 3 of the present invention can directly reduce noise by 60% compared with N2 directly coming out of the exhaust pipe 1. If carbon steel is used, the inner wall of the buffer tube 3 needs to be sprayed with a layer of anti-corrosion material to extend the service life of the pipeline.

[0063] The shock-absorbing silicon PU elastic layer 23 is provided with an integrally formed groove layer 36, which is used to increase the contact area between the shock-absorbing silicon PU elastic layer and the buffer tube and reduce the deformation of the shock-absorbing silicon PU elastic layer. The thickness of the shock-absorbing silicon PU elastic layer satisfies the following relationship: D = d1 + d2, where D is in cm, d1 = k*d3, k = 2*r / L, r is the outer diameter of the buffer tube, r ranges from 0.5 to 1m, L is the width of the groove layer notch, L ranges from (0.67 to 0.7)*2r, d3 is the wall thickness of the buffer tube, d3 ranges from 0.5 to 0.7cm; d2 = 2*d3

[0064] Working Principle: During exhaust, the exhaust valve 7 is opened, and N2 enters the buffer tube 3 through the exhaust pipe 1. The buffer tube 3 performs an initial release of N2. The buffer tube 3 isolates the high-pressure N2 from the soil 5, preventing N2 from causing cracking, bulging, collapse, and contamination. The buffer tube 3 is located underground. The soil 5 itself has a certain sound insulation effect. In addition, the sound-absorbing layer 21 also has a sound-absorbing effect, which greatly reduces the noise generated by N2. The buffered N2 enters the silencer 4 through the connecting pipe 12. The silencer 4 performs secondary noise reduction and chemical filtration on the N2. Specifically, the sound-absorbing cotton 9 silences the N2, and the cross-linking agent is absorbed by the activated carbon layer 15 through the adsorption holes 17, ensuring that clean N2 is discharged from the top pipe 10 to avoid atmospheric pollution. It should be noted that directly emitting clean N2 and the emission volume within a certain range meets environmental requirements.

Claims

1. A crack and bulge-proof supercritical nitrogen safety discharge device, comprising an exhaust pipe, an exhaust trough, a buffer pipe, a silencer, and an adsorption structure; The exhaust trough is set under the soil for storing the buffer tube, and the top of the exhaust trough is provided with a cement cover plate, and the surface of the cement cover plate is covered with soil; One end of the exhaust pipe is connected to the buffer pipe, and the other end is connected to the exhaust port of the high-pressure reactor. An exhaust valve is provided on the exhaust pipe; The silencer includes a tube body and sound-absorbing cotton arranged in the interlayer of the tube body. A top tube is provided on the top of the tube body and a bottom tube is provided on the bottom. The bottom of the bottom tube is connected to the buffer tube through a connecting tube. A card slot is formed on the inner wall of the tube body. The card slot is composed of two symmetrically arranged L-shaped card strips with a cross section. The card slot is used to cooperate with the insertion of the adsorption structure.

2. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 1 is characterized in that: The adsorption structure includes an adsorption slot that is inserted into the card slot, an activated carbon layer filled in the interlayer of the adsorption slot, and a bottom plate fixedly installed at the bottom of the adsorption slot. An adsorption hole is provided on the side of the adsorption slot close to the slot opening of the card slot, and a socket for inserting the adsorption slot is provided at the bottom of the tube body. The bottom plate is connected to the tube body with screws.

3. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 2 is characterized in that: A support frame is provided on the outer wall of the tube body, the top of the support frame is connected to the tube body with bolts, and the bottom of the support frame is fixed to the ground; The discharge device also includes a pipe body transfer device, which includes: A frame, wherein a universal wheel is provided at the bottom of the frame; A lifting device, used to lift and transfer the pipe body; The support device supports the bottom of the pipe body, making it easier for workers to separate the support frame from the pipe body to prevent the pipe body from falling; A separation device is used to separate the support frame from the pipe body to avoid friction between the support frame 18 and the side wall of the pipe body when the pipe body is lifted and transferred; The lifting device includes two sets of lifting cylinders, the output ends of the lifting cylinders are connected to hanging ropes, the lifting cylinders are fixedly mounted on the top of the frame, the top of the frame is provided with a through hole, the bottom end of the hanging rope passes through the through hole and is fixed with a hook, and the side wall of the tube body is provided with two hanging ears, which are matched with the hooks; The support device includes two sets of support plates, the support plates are welded to the frame, and support cylinders are installed on the support plates; The separation device includes two sets of separation rods, one end of the separation rods is hinged to the frame, a separation cylinder is provided on the frame, one end of the separation cylinder is hinged to the frame, and the output end of the separation cylinder is hinged to the separation rods; The support frame is provided with a separation hole, and the separation hole is inserted in cooperation with the separation rod.

4. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 3 is characterized in that: The steps of transferring the tube body include the following: Step 1: Move the frame to move the support cylinder to the bottom of the tube body, insert the separation rod into the separation hole, and then connect the hook with the hanging ear; Step 2: Unscrew the bolts between the support frame and the pipe body; Step 3: The working output end of the separation cylinder extends outward, causing the separation rod to rotate outward, so that the support frame moves away from the tube body; Step 4: The lifting cylinder drives the pipe body upward, and the supporting cylinder is lifted upward at the same time. The supporting cylinder and the lifting cylinder cooperate to bring the pipe body away from the support frame; Step 5: After the bottom of the tube body is completely separated from the support frame, the output end of the support cylinder is retracted, the separation cylinder is retracted, and finally the frame is transferred to drive the tube body to the destination for cleaning.

5. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 2 is characterized in that: The distance between the bottom plate and the ground is greater than the height of (adsorption tank+bottom plate).

6. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 2 is characterized in that: There are four card slots, which are evenly spaced along the inner wall of the tube body.

7. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 2 is characterized in that: The number of the silencers is three.

8. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 2 is characterized in that: The exhaust groove wall is provided with a cement mortar layer, a waterproof and moisture-proof coating layer, a sound-absorbing layer and an adsorption coating layer in sequence from the inside to the outside.

9. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 8, characterized in that: A shock-absorbing silicon PU elastic layer is laid on the adsorption coating at the bottom of the exhaust groove, and the shock-absorbing silicon PU elastic layer is in contact with and connected to the buffer tube.

10. The anti-cracking and anti-bulging supercritical N2 safety discharge device according to claim 9 is characterized in that: The shock-absorbing silicone PU elastic layer is provided with an integrally formed groove layer, which is used to increase the contact area between the shock-absorbing silicone PU elastic layer and the buffer tube and reduce the deformation of the shock-absorbing silicone PU elastic layer. The thickness of the shock-absorbing silicone PU elastic layer satisfies the following relationship: D = d1 + d2, where D is in cm, d1 = k*d3, k = 2*r / L, r is the outer diameter of the buffer tube, and the range of r is 0.5-1m, L is the width of the groove layer notch, and the range of L is (0.67-0.7)*2r, d3 is the wall thickness of the buffer tube, and the range of d3 is 0.5-0.7cm; d2 = 2*d3.

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