Automatic interception device capable of preventing backflow and liquid mixing and control method of automatic interception device

Abstract

The invention discloses an anti-backflow liquid-mixing automatic intercepting device and a control method thereof, and belongs to the technical field of fluid anti-backflow devices, the anti-backflow liquid-mixing automatic intercepting device comprises a steam conveying device, an anti-backflow device, an aging kettle and a static material dissolving kettle; the automatic intercepting device can quickly intercept materials flowing back from a static chemical material kettle through a plurality of material backflow intercepting mechanisms, so that the backflow materials are intercepted outside or inside a gas-liquid separation tank; after the backflow material is intercepted in the gas-liquid separation tank, the gas-liquid separation tank can utilize the height of the gas-liquid separation tank and a top gas inlet to restrain the material in the tank, so that the material is prevented from overflowing from the gas inlet in the top of the gas-liquid separation tank to previous related procedures such as an aging kettle to cause severe chemical reaction caused by mutual streaming and mixing of different media; safety risks caused by human and equipment damage are reduced to the maximum extent, and the safety of the production process is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid backflow prevention devices, and in particular to an automatic backflow prevention and cross-flow liquid interception device and a control method thereof. Background Art

[0002] A static quenching kettle is a device used for dissolving and mixing substances. It dissolves solid water glass by stirring and heating it, fully dispersing and dissolving it in the solvent to form a uniform solution. The static quenching kettle employs a "one-time feeding, multiple dissolution" method. After dissolving the solid water glass for a period of time, the partially dissolved liquid water glass is discharged from the quenching kettle into a storage tank. Filtered water is then added, and the steam valve is opened to allow steam to increase the temperature. If the check valve on the quenching kettle's steam pipe fails or the steam pressure fluctuates below the static quenching kettle's operating pressure, material backflow within the kettle can occur. This backflow can overflow along the steam pipe network into the preceding process, causing alkaline and acidic materials to mix and react, potentially impacting process operations or causing serious safety incidents. Currently, adding a gas-liquid separation tank or buffer tank before the quenching kettle slows the backflow, buying valuable time to close all process valves and ensuring production safety.

[0003] At present, Chinese patent CN221267140U discloses an anti-backflow system for alkali washing, which sets a buffer tank between the vaporization tower and the alkali washing tower, and the volume of the buffer tank is larger than the volume of the alkali washing tower, so that even if all the materials in the alkali washing tower flow back, they cannot overflow from the buffer tank to the previous process, and the backflow materials are effectively suppressed in the buffer tank; however, the overall space of the anti-backflow system is large, resulting in low site utilization, which is not conducive to the layout under limited industrial production site conditions; and in the industrial production process, in order to facilitate the gas to enter the subsequent process from the gas-liquid separation tank, the top of the gas-liquid separation tank is usually set as an exhaust pipe, and an air inlet pipe is provided on one side of the middle of the tank body. When the material flows back to the middle of the tank body, the material can overflow into the previous related process along the air inlet pipe, so there are still serious safety hazards.

[0004] Therefore, there is an urgent need for an automatic interception device and a control method for preventing backflow and liquid leakage, which adopts multi-level interception to ensure that the backflow material will not overflow into the previous related processes, avoiding chemical reactions of the mixed liquid and causing safety accidents. Summary of the Invention

[0005] The object of the present invention is to provide an automatic interception device for preventing backflow and liquid leakage and a control method thereof, so as to solve at least one aspect of the problems and defects raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the first aspect of the present invention provides the following technical solutions: The application discloses an anti-backflow and liquid automatic interception device. The application discloses an anti-backflow and liquid automatic interception device. The anti-backflow device comprises a vertical gas-liquid separation tank and a gas conveying pipe. The steam conveying device is in communication with the gas inlet of the gas-liquid separation tank and the aging kettle respectively. The anti-backflow device further comprises a plurality of material backflow interception mechanisms.

[0007] The anti-backflow and liquid automatic interception device has at least the following technical effects. The anti-backflow and liquid automatic interception device is provided with the anti-backflow device between the steam conveying device and the static material kettle.

[0008] The gas-liquid separation tank utilizes the weight difference between liquid and gas to separate.

[0009] Compared with the buffer tank of the traditional anti-backflow device, the gas-liquid separation tank of the anti-backflow and liquid automatic interception device is in a vertical structure. 3 -0.4m 3 , which is far less than the total material capacity range of the static material kettle, i.e. 3 -23m 3When the front-stage interception is effective, the material is prevented from flowing back from the middle air inlet at a lower position on the tank body to the previous related process by utilizing its own height and the setting method of the air inlet on the middle side compared to the air outlet on the top of the traditional gas-liquid separation tank. The present application can effectively intercept the backflowing material without increasing the volume of the gas-liquid separation tank or the buffer tank, which can effectively reduce the volume of the entire device. In the case of limited industrial production space, it saves precious space resources, makes the production layout more compact and reasonable, is conducive to improving the utilization rate of the site, and reduces the manufacturing and maintenance costs of the equipment.

[0010] As a further solution of the present invention: the plurality of material backflow interception mechanisms include a check valve provided on the gas delivery pipe.

[0011] Since several material backflow interception mechanisms include a check valve installed on the gas conveying pipe, the check valve is designed with one-way flow and automatically closes the valve using the material backflow pressure; when the material tends to backflow, the check valve is quickly closed due to the pressure of the backflow material, effectively preventing the medium on the higher pressure side from entering the lower pressure side, avoiding the material from flowing back to the gas-liquid separation tank, and performing a first-level interception of the material backflow, so that the material is intercepted outside the gas-liquid separation tank, preventing the backflow material from damaging the equipment.

[0012] As a further solution of the present invention: several material backflow interception mechanisms also include a pneumatic shut-off valve arranged on the gas conveying pipe and a pressure transmitter arranged on the side of the gas-liquid separation tank away from the gas conveying pipe, and the pressure transmitter is connected to the pneumatic shut-off valve through an electrical signal line.

[0013] As a further solution of the present invention: a cut-off valve is provided on one side of the pressure transmitter.

[0014] Since the material backflow interception mechanisms also include a pneumatic shut-off valve provided on the gas delivery pipe and a pressure transmitter provided on the side of the gas-liquid separation tank away from the gas delivery pipe, the pressure transmitter and the pneumatic shut-off valve are connected through an electrical signal line; when the liquid level in the gas-liquid separation tank is lower than the liquid level interface, the pressure pipeline is unblocked, at this time the reading of the pressure transmitter is positive, the shut-off valve is in the open state, the gas-liquid separation tank works normally, and there is no material backflow; when the liquid level in the gas-liquid separation tank is higher than the liquid level interface, the pressure pipeline is filled with backflow material, at this time the reading of the pressure transmitter is negative, the shut-off valve is in the closed state, and the liquid level in the gas-liquid separation tank is abnormal. The material flows back; when the material tends to flow back, and the check valve fails due to a malfunction or the steam pressure is lower than the working pressure of the static material kettle due to process changes, the material will flow back into the gas-liquid separation tank. At this time, the pressure sensor in the pressure transmitter will convert it into an electrical signal according to the liquid level and pressure in the tank and transmit it to the solenoid valve of the pneumatic shut-off valve; the compressed air transported by the pressure pipeline is used to control the opening and closing of the pneumatic shut-off valve, forming an overall interlocking and linkage of the pressure transmitter and the pneumatic shut-off valve, and performing secondary interception on the backflow material, intercepting the backflow material in the gas-liquid separation tank to prevent the backflow material from further spreading.

[0015] The pressure transmitter is used to monitor and analyze the liquid level and pressure in the gas-liquid separation tank in real time. When the liquid level and pressure change, they are converted into control instructions to promptly control the closure of the pneumatic shut-off valve. This greatly improves the active control capability during material backflow, preventing the material from further backflowing into the previous related process in the gas-liquid separation tank, causing liquid mixing and chemical reactions, and ensuring the safety of the production process.

[0016] As a further solution of the present invention: the gas-liquid separation tank serves as an isolation tank when the material in the static material kettle flows back.

[0017] Since the gas-liquid separation tank is an isolation tank when the material in the static material kettle flows back; after the secondary interception takes effect, the material flowing back into the gas-liquid separation tank is limited and not enough to overflow the entire gas-liquid separation tank. The height of the gas-liquid separation tank itself is used to perform tertiary interception on the backflow material, and the backflow material is isolated in the gas-liquid separation tank, avoiding the backflow material from flowing back from the air inlet at the top of the gas-liquid separation tank to the previous related process; thereby greatly reducing the risk of safety accidents such as fire, explosion, and poisoning; compared with traditional gas-liquid separation tanks, the air inlet and air outlet of the gas-liquid separation tank of the present application are installed in reverse order, that is, steam enters the separation tank from the top and leaves the separation tank from the middle of the tank body. In this way, when the material flows back, the gas-liquid separation tank can act as an isolation tank and assume the role of isolating the backflow material, completely and thoroughly blocking the backflow material inside the gas-liquid separation tank, ensuring that the backflow material cannot overflow into other processes and equipment, and ensuring the safety of the entire production.

[0018] As a further solution of the present invention: the diameters of the air inlet and the air outlet of the gas-liquid separation tank are 1.4-1.5 times larger than the diameters of the steam transmission pipe and the gas transmission pipe.

[0019] Since the diameters of the air inlet and outlet of the gas-liquid separation tank are 1.4-1.5 times larger than the diameters of the steam transmission pipe and the gas transmission pipe, the flow path of the fluid material can be effectively increased, ensuring smooth fluid flow, avoiding material backflow caused by increased pressure loss due to narrow pipe diameter, effectively reducing the occurrence of material backflow, reducing production interruptions caused by material backflow, and ensuring production efficiency and stability.

[0020] As a further solution of the present invention: a drain pipe is provided at one end of the drain outlet, and a first drain ball valve, a second drain ball valve, a filter, a steam trap and a third drain ball valve are sequentially provided on the drain pipe.

[0021] A drain pipe is provided at one end of the drain outlet, and a first drain ball valve, a second drain ball valve, a filter, a steam trap, and a third drain ball valve are sequentially installed on the drain pipe. The first and second drain ball valves serve as isolation devices, facilitating inspection or replacement of the filter and steam trap. The filter intercepts solid matter such as impurities, particles, and sediment in the drain water, preventing them from entering the steam trap and causing wear or clogging of the valve core, thereby affecting its performance. Furthermore, the third drain ball valve serves as a last line of defense. In the event of a steam trap failure or emergency closure of the drain, closing the third drain ball valve quickly shuts off the drain channel, preventing liquid leakage and damage to the surrounding environment and equipment, thereby ensuring system safety. Furthermore, under different production conditions, parameters such as the drain flow rate, pressure, and temperature may vary. By adjusting the openings of the first, second, and third drain ball valves, the drainage system can better adapt to these changes, ensuring stable operation under various operating conditions.

[0022] As a further solution of the present invention: the drain pipe is provided with a drain branch pipe in parallel at the ends of the first drain ball valve and the third drain ball valve, and a bypass ball valve is provided on the drain branch pipe.

[0023] By arranging a drainage branch pipe in parallel at the ends of the first drain ball valve and the third drain ball valve in the drainage pipe, a bypass ball valve is provided on the drainage branch pipe; when the filter or the steam trap needs to be repaired and the accumulated liquid in the air-liquid separation tank needs to be discharged, the bypass ball valve is opened to discharge the liquid from the drainage branch pipe; this ensures that the drainage function of the gas-liquid separation tank is not affected, maintains the continuity of the gas-liquid separation link in the production process, avoids production stagnation due to maintenance, and improves production efficiency.

[0024] As a further solution of the present invention: the steam conveying device includes a steam sub-cylinder, and the steam conveying device is connected to the air inlet of the gas-liquid separation tank and the aging kettle through the steam sub-cylinder.

[0025] Since the steam conveying device includes a steam sub-cylinder, the steam conveying device is connected to the air inlet of the gas-liquid separation tank and the aging kettle respectively through the steam sub-cylinder; the gas-liquid separation tank and the aging kettle require steam of different flow rates and pressures when working. The steam sub-cylinder can be used to adjust the flow rate and pressure of the steam delivered to the aging kettle and the gas-liquid separation tank respectively, ensuring that both equipment can obtain appropriate steam supply to meet their respective process requirements; therefore, when the material flows back, the backflow material is intercepted at several levels, which can effectively prevent the backflow material from overflowing into the aging kettle and other processes through the steam conveying pipe, thereby preventing the possibility of affecting the process operation and the occurrence of safety accidents.

[0026] As a further solution of the present invention: the support at the bottom of the gas-liquid separation tank is connected to the ground by using expansion bolts.

[0027] During operation, the gas-liquid separation tank may be affected by the pressure and vibration of the internal fluid and external environmental factors. By using expansion bolts to connect the support at the bottom of the gas-liquid separation tank to the ground, it can effectively prevent the gas-liquid separation tank from shaking or displacement during operation, ensuring that the equipment can maintain structural stability under various process conditions, thereby ensuring the stability and reliability of process production.

[0028] The second aspect of the present invention further discloses a control method for an automatic interception device for preventing backflow and liquid leakage, comprising the following steps: S1. When the pressure in the static material kettle is greater than the steam delivery pressure, causing the material to flow back, the check valve automatically closes the valve due to the material backflow pressure to intercept the backflow material at the first level, and intercepts the backflow material outside the gas-liquid separation tank; S2. When the check valve fails or cannot completely intercept the backflow material, the material will flow back into the gas-liquid separation tank. The pressure transmitter transmits a signal to the solenoid valve of the pneumatic shut-off valve according to the liquid level and pressure in the tank. The pneumatic shut-off valve closes, and the backflow material is intercepted in the second level, and the backflow material is intercepted in the gas-liquid separation tank. S3. After the secondary interception takes effect, the material liquid height is not enough to overflow the entire gas-liquid separation tank. The height of the gas-liquid separation tank and the top air inlet are used to perform a tertiary interception on the backflow material and intercept the backflow material in the gas-liquid separation tank; S4. Close all valves in the upstream and downstream processes, and open the drain port at the bottom of the gas-liquid separation tank to discharge the material from the drain pipe.

[0029] By adopting the control method of the automatic interception device for preventing backflow and cross-liquid, when the material in the static material kettle flows back due to equipment pressure fluctuation, equipment start-up and shutdown or equipment failure, the check valve automatically closes the valve by using the pressure of the fluid backflow to prevent the material from flowing in the opposite direction, and performs a first-level interception on the backflow material; if the material continues to flow back into the gas-liquid separation tank, the real-time monitoring and data transmission function of the pressure transmitter is used to immediately transmit a signal to the solenoid valve of the pneumatic shut-off valve when the pressure in the gas-liquid separation tank suddenly changes, so that the pneumatic shut-off valve is quickly closed, and the backflow of the material is intercepted at a second level, and the backflow material is intercepted in the gas-liquid separation tank; after the second-level interception takes effect, By utilizing the height of the vertical structure gas-liquid separation tank itself, the material that has flowed back into the gas-liquid separation tank is suppressed in the tank, and the backflow of the material is intercepted at three levels, so that the backflow material will not overflow the entire gas-liquid separation tank, and the backflow material is prevented from overflowing from the top air inlet into the aging kettle or other previous related processes. At the same time, all valves of the upstream and downstream processes are closed, and the drain port at the bottom of the gas-liquid separation tank is opened to discharge the material from the drain pipe to the backflow material collection container; through several levels of interception of the backflow material, it is effectively prevented that the material in the static material kettle is backflowed and mixed with the material in the previous related process, thereby avoiding equipment damage and the possibility of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the principle structure of an automatic interception device to prevent backflow and cross-flow; Figure 2 This is a schematic diagram of the structure of an automatic interception device for preventing backflow and cross-flow of liquid; Figure 3 This is a schematic diagram of the structure of a gas-liquid separation tank with an automatic interception device to prevent backflow and liquid leakage.

[0032] Reference numerals: 1. Steam conveying device; 11. Steam cylinder; 2. Backflow prevention device; 21. Gas-liquid separation tank; 211. Air inlet; 212. Air outlet; 213. Drain outlet; 22. Gas conveying pipe; 23. Check valve; 24. Pneumatic shut-off valve; 25. Pressure transmitter; 26. Shut-off valve; 3. Aging kettle; 4. Static material kettle; 5. Drain pipe; 51. First drain ball valve; 52. Second drain ball valve; 53. Filter; 54. Steam trap; 55. Third drain ball valve; 6. Drain branch pipe; 61. Bypass ball valve. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0038] 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 is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0039] like Figure 1-3The embodiment of the present invention shown is an automatic interception device for preventing backflow and liquid leakage, comprising: a steam conveying device 1, an anti-backflow device 2, an aging kettle 3 and a static material kettle 4; the anti-backflow device 2 comprises a vertical gas-liquid separation tank 21 and a gas conveying pipe 22, the top of the gas-liquid separation tank 21 is provided with an air inlet 211, the side of the gas-liquid separation tank 21 is provided with an air outlet 212, and the bottom of the gas-liquid separation tank 21 is provided with a drain outlet 213; the steam conveying device 1 is respectively connected to the air inlet 211 of the gas-liquid separation tank 21 and the aging kettle 3, and the air outlet 212 of the gas-liquid separation tank 21 is connected to the static material kettle 4 through the gas conveying pipe 22; the anti-backflow device 2 also includes a number of material backflow interception mechanisms.

[0040] Specifically, the working pressure of the static material kettle 4 of the present application is 0.4Mpa, and the steam delivery pressure is 0.6Mpa; when the process conditions change, the manual operation is improper, or the equipment seal fails, the steam delivery pressure may be less than 0.4Mpa, resulting in the backflow of the material in the static material kettle 4; and the pressure of the static material kettle 4 when the material flows back is equal to its working pressure, so when the material backflow pressure is 0.4Mpa, the material backflow interception mechanism will intercept the backflow material in stages; when the material backflow When the first-level interception of the flow interception mechanism takes effect, the backflow material is intercepted outside the gas-liquid separation tank 21; when the second-level interception of the material backflow interception mechanism takes effect, the backflow material is intercepted inside the gas-liquid separation tank 21; and then the height of the gas-liquid separation tank 21 and the gas-liquid separation tank air inlet 211 and air outlet 212 are set opposite to the traditional gas-liquid separation tank 21 or buffer tank, so that after the second-level interception takes effect, the backflow material cannot flow back from the air inlet 211 at the top of the gas-liquid separation tank 21 to the previous related process, and the material is intercepted at the third level.

[0041] The automatic backflow prevention and liquid cross-interception device is implemented by arranging an anti-backflow device 2 between the steam conveying device 1 and the static material kettle 4. The anti-backflow device 2 includes a gas-liquid separation tank 21 and a plurality of material backflow interception mechanisms. Through the interception mechanism, the material flowing back from the static material kettle 4 can be quickly intercepted, so that the backflow material is intercepted outside or inside the gas-liquid separation tank 21; and when the backflow material is intercepted inside the gas-liquid separation tank 21, the gas-liquid separation tank 21 can use its own height to suppress the material in the tank, preventing the material from overflowing from the air inlet at the top of the gas-liquid separation tank 21 to the aging kettle 3 and other related processes in the previous sequence, causing different media to cross-flow and mix with each other to produce violent chemical reactions, thereby minimizing the safety risks caused by human and equipment damage and ensuring the safety of the production process.

[0042] Compared with the buffer tank of the traditional anti-backflow device, the gas-liquid separation tank 21 of the anti-backflow liquid automatic interception device of the present application is a vertical structure, and the total material capacity of the gas-liquid separation tank 21 is 0.1m 3 -0.4m 3, much smaller than the total material capacity range of static material kettle 4 8m 3 -23m 3 When the front-stage interception is effective, the material is prevented from flowing back from the middle air inlet at a lower position on the tank body to the previous related process by utilizing its own height and the setting method of the air inlet on the middle side compared to the air outlet on the top of the traditional gas-liquid separation tank. The present application can effectively intercept the backflowing material without increasing the volume of the gas-liquid separation tank or the buffer tank, which can effectively reduce the volume of the entire device. In the case of limited industrial production space, it saves precious space resources, makes the production layout more compact and reasonable, is conducive to improving the utilization rate of the site, and reduces the manufacturing and maintenance costs of the equipment.

[0043] Furthermore, if Figure 2 As shown, several material backflow interception mechanisms include a check valve 23 provided on the gas delivery pipe 22 .

[0044] Specifically, since several material backflow interception mechanisms include a check valve 23 provided on the gas conveying pipe 22, the check valve 23 is designed with a one-way flow and automatically closes the valve using the material backflow pressure; when the material tends to backflow, the check valve 23 is quickly closed due to the pressure of the backflow material, effectively preventing the medium on the higher pressure side from entering the lower pressure side, avoiding the material from backflowing to the gas-liquid separation tank 21, and performing a first-level interception on the material backflow, so that the material is intercepted outside the gas-liquid separation tank 21, preventing the backflow material from causing damage to the equipment.

[0045] Furthermore, several material backflow interception mechanisms also include a pneumatic shut-off valve 24 arranged on the gas delivery pipe 22 and a pressure transmitter 25 arranged on the side of the gas-liquid separation tank 21 away from the gas delivery pipe 22. The pressure transmitter 25 is connected to the pneumatic shut-off valve 24 through an electrical signal line; a shut-off valve 26 is arranged on one side of the pressure transmitter 25.

[0046] Specifically, since the several material backflow interception mechanisms also include a pneumatic shut-off valve 24 provided on the gas delivery pipe 22 and a pressure transmitter 25 provided on the side of the gas-liquid separation tank 21 away from the gas delivery pipe 22, the pressure transmitter 25 is connected to the pneumatic shut-off valve 24 through an electrical signal line; when the liquid level in the gas-liquid separation tank 21 is lower than the liquid level interface, the pressure-leading pipeline is unblocked, at this time the reading of the pressure transmitter 25 is positive, the shut-off valve 26 is in the open state, and the gas-liquid separation tank 21 works normally without material backflow; and when the liquid level in the gas-liquid separation tank 21 is higher than the liquid level interface, the pressure-leading pipeline is filled with backflow material, at this time the reading of the pressure transmitter 25 is negative, the shut-off valve 26 is in the closed state, the liquid level of the gas-liquid separation tank 21 is abnormal, and material backflow occurs; when the material When there is a backflow trend and the check valve 23 fails due to a malfunction or the steam pressure is lower than the working pressure of the static material kettle due to process changes, the material will flow back into the gas-liquid separation tank 21. At this time, the pressure sensor in the pressure transmitter 25 will convert the signal into an electrical signal according to the liquid level and pressure in the tank and transmit it to the solenoid valve of the pneumatic shut-off valve 24. The compressed air transported by the pressure pipeline is used to control the opening and closing of the pneumatic shut-off valve 24, forming an overall interlocking and linkage between the pressure transmitter 25 and the pneumatic shut-off valve 24, and performing a secondary interception of the backflow material, intercepting the backflow material in the gas-liquid separation tank 21, preventing the backflow material from further spreading, and avoiding dangerous chemical reactions caused by the mixing of different material media due to backflow, thereby greatly improving the safety of the production process.

[0047] According to an embodiment of the present invention, the gas-liquid separation tank 21 serves as an isolation tank when the material in the static material kettle 4 flows back.

[0048] Specifically, since the gas-liquid separation tank 21 is an isolation tank when the material in the static material kettle 4 flows back; after the secondary interception takes effect, the material flowing back into the gas-liquid separation tank 21 is limited and not enough to overflow the entire gas-liquid separation tank 21, the height of the gas-liquid separation tank 21 itself is used to perform a tertiary interception on the backflow material, and the backflow material is isolated in the gas-liquid separation tank 21, and the backflow material is prevented from flowing back from the air inlet 211 at the top of the gas-liquid separation tank 21 to the previous related process; thereby greatly reducing the risk of safety accidents such as fire, explosion, and poisoning; compared with the traditional gas-liquid separation tank, the gas-liquid separation tank 21 of the present application has the air inlet 211 and the air outlet 212 installed in reverse order, that is, the steam enters the separation tank from the top and leaves the separation tank from the middle of the tank body, so that when the material flows back, the gas-liquid separation tank 21 can act as an isolation tank, assume the role of isolating the backflow material, and completely and thoroughly block the backflow material inside the gas-liquid separation tank 21, ensuring that the backflow material cannot overflow into other processes and equipment, thereby ensuring the safety of the entire production.

[0049] Furthermore, the diameters of the air inlet 211 and the air outlet 212 of the gas-liquid separation tank 21 are 1.4-1.5 times larger than the diameters of the steam transmission pipe and the gas transmission pipe.

[0050] Specifically, since the diameters of the air inlet 211 and the air outlet 212 of the gas-liquid separation tank 21 are 1.4-1.5 times larger than the diameters of the steam transmission pipe and the gas transmission pipe, the flow path of the fluid material can be effectively increased, ensuring smooth fluid flow, avoiding the increase in pressure loss due to narrow pipe diameters and causing material backflow, effectively reducing the occurrence of material backflow, reducing production interruptions caused by material backflow, and ensuring production efficiency and stability.

[0051] like Figure 2 As shown, a drain pipe 5 is provided at one end of the drain outlet 213 , and a first drain ball valve 51 , a second drain ball valve 52 , a filter 53 , a steam trap 54 and a third drain ball valve 55 are sequentially provided on the drain pipe 5 .

[0052] Specifically, since a drain pipe 5 is provided at one end of the drain outlet 213, a first drain ball valve 51, a second drain ball valve 52, a filter 53, a drain valve 54 and a third drain ball valve 55 are sequentially provided on the drain pipe 5; the first drain ball valve 51 and the second drain ball valve 52 can be used as isolation devices to facilitate the inspection or replacement of the filter 53 and the drain valve 54; the filter 53 can intercept solid matter such as impurities, particles, and sediments in the drainage to prevent impurities from entering the drain valve 54, causing wear or blockage of the valve core of the drain valve 54 and affecting its working performance; at the same time, the third drain ball valve 55 The ball valve 55 can serve as the last line of defense. When the drain valve 54 fails or the drainage needs to be shut down urgently, closing the third drain ball valve 55 can quickly cut off the drainage channel, prevent liquid leakage, avoid damage to the surrounding environment and equipment, and ensure the safety of the system; in addition, under different production conditions, the flow, pressure, temperature and other parameters of the drainage may change. By adjusting the opening of the first drain ball valve 51, the second drain ball valve 52 and the third drain ball valve 55, the drainage system can better adapt to these changes, ensuring that the system can operate stably under various working conditions.

[0053] Furthermore, a drainage branch pipe 6 is provided in parallel at the ends of the first drainage ball valve 51 and the third drainage ball valve 55 of the drainage pipe 5 , and a bypass ball valve 61 is provided on the drainage branch pipe 6 .

[0054] Specifically, a drainage branch pipe 6 is arranged in parallel at the ends of the first drainage ball valve 51 and the third drainage ball valve 55 in the drainage pipe 5, and a bypass ball valve 61 is provided on the drainage branch pipe 6; when the filter 53 or the steam trap 54 needs to be repaired and the accumulated liquid in the air-liquid separation tank 21 needs to be discharged, the bypass ball valve 61 is opened to discharge the liquid from the drainage branch pipe 6; this ensures that the drainage function of the gas-liquid separation tank 21 is not affected, maintains the continuity of the gas-liquid separation link in the production process, avoids production stagnation due to maintenance, and improves production efficiency.

[0055] like Figure 1 As shown, the steam conveying device 1 includes a steam sub-cylinder 11 , and the steam conveying device 1 is connected to the air inlet 211 of the gas-liquid separation tank 21 and the aging kettle 3 through the steam sub-cylinder 11 .

[0056] Specifically, since the steam conveying device 1 includes a steam sub-cylinder 11, the steam conveying device 1 is connected to the air inlet 211 of the gas-liquid separation tank 21 and the aging kettle 3 respectively through the steam sub-cylinder 11; the gas-liquid separation tank 21 and the aging kettle 3 require steam of different flow rates and pressures when working. The steam sub-cylinder 11 can adjust the flow rate and pressure of the steam delivered to the aging kettle 3 and the gas-liquid separation tank 21 respectively, ensuring that both devices can obtain appropriate steam supply to meet their respective process requirements; therefore, when the material flows back, through several levels of interception of the backflow material, the backflow material can be effectively prevented from overflowing into the aging kettle 3 and other processes through the steam conveying pipe, thereby preventing the possibility of affecting the process operation and the occurrence of safety accidents.

[0057] It should also be noted that the support at the bottom of the gas-liquid separation tank 21 is connected to the ground using expansion bolts.

[0058] Specifically, the gas-liquid separation tank 21 may be affected by the pressure, vibration and external environmental factors of the internal fluid during operation. By using expansion bolts to connect the support at the bottom of the gas-liquid separation tank 21 to the ground, the gas-liquid separation tank 21 can be effectively prevented from shaking or displacing during operation, ensuring that the equipment can maintain structural stability under various process conditions, thereby ensuring the stability and reliability of process production.

[0059] The second aspect of the present invention further provides a control method for an automatic interception device for preventing backflow and liquid leakage, comprising the following steps: S1, when the pressure in the static material kettle 4 is greater than the steam delivery pressure, causing the material to flow back, the check valve 23 automatically closes the valve due to the material backflow pressure to intercept the backflow material at the first level, intercepting the backflow material outside the gas-liquid separation tank 21; S2. When the check valve 23 fails or cannot completely intercept the backflow material, the material flows back into the gas-liquid separation tank 21. The pressure transmitter 25 transmits a signal to the solenoid valve of the pneumatic shut-off valve 24 according to the liquid level and pressure in the tank. The pneumatic shut-off valve 24 closes, performing a secondary interception of the backflow material and intercepting the backflow material in the gas-liquid separation tank 21. S3: After the secondary interception takes effect, the material liquid height is not enough to overflow the entire gas-liquid separation tank 21. The backflow material is intercepted at the third level by utilizing the height of the gas-liquid separation tank 21 and the top air inlet 211, and the backflow material is intercepted in the gas-liquid separation tank 21; S4. Close all valves in the upstream and downstream processes, and open the drain port 213 at the bottom of the gas-liquid separation tank 21 to discharge the material from the drain pipe 5.

[0060] Specifically, through the control method of the automatic interception device for preventing backflow and cross-liquid flow, when the material in the static material kettle 4 flows back due to equipment pressure fluctuation, equipment start-up and shutdown, or equipment failure, the check valve 23 automatically closes the valve using the pressure of the fluid backflow to prevent the material from flowing in the opposite direction, and performs a first-level interception on the backflow material; if the material continues to flow back into the gas-liquid separation tank 21, the real-time monitoring and data transmission function of the pressure transmitter 25 is used. When the pressure of the gas-liquid separation tank 21 suddenly changes, a signal is immediately transmitted to the solenoid valve of the pneumatic shut-off valve 24, so that the pneumatic shut-off valve 24 is quickly closed, and the backflow of the material is intercepted at a second level, and the backflow material is intercepted in the gas-liquid separation tank 21; after the second-level interception takes effect, , utilizing the height of the vertical structure gas-liquid separation tank 21 itself, the material that has flowed back into the gas-liquid separation tank 21 is suppressed in the tank, and the backflow of the material is intercepted at three levels, so that the backflow material will not overflow the entire gas-liquid separation tank 21, and the backflow material is prevented from overflowing from the top air inlet 211 into the aging kettle 3 or other previous related processes. At the same time, all valves of the upstream and downstream processes are closed, and the drain port 213 at the bottom of the gas-liquid separation tank 21 is opened to discharge the material from the drain pipe 5 to the backflow material collection container; through several levels of interception of the backflow material, it is effectively prevented that the material in the static material kettle 4 is backflowed and mixed with the material in the previous related process, thereby avoiding equipment damage and the possibility of safety accidents.

[0061] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. An automatic interception device for preventing backflow and liquid leakage, characterized in that: include: Steam conveying device (1), backflow prevention device (2), aging kettle (3) and static material kettle (4); The backflow prevention device (2) comprises a vertical gas-liquid separation tank (21) and a gas delivery pipe (22); the top of the gas-liquid separation tank (21) is provided with an air inlet (211); the side of the gas-liquid separation tank (21) is provided with an air outlet (212); and the bottom of the gas-liquid separation tank (21) is provided with a drain outlet (213); The steam conveying device (1) is respectively connected to the air inlet (211) of the gas-liquid separation tank (21) and the aging kettle (3); the air outlet (212) of the gas-liquid separation tank (21) is connected to the static material kettle (4) through the gas conveying pipe 22; The backflow prevention device (2) also includes a plurality of material backflow interception mechanisms.

2. The automatic interception device for preventing backflow and liquid leakage according to claim 1 is characterized in that: The plurality of material backflow interception mechanisms include a check valve (23) provided on the gas delivery pipe (22).

3. The automatic interception device for preventing backflow and liquid leakage according to claim 2 is characterized in that: The plurality of material backflow interception mechanisms further include a pneumatic shut-off valve (24) provided on the gas delivery pipe (22) and a pressure transmitter (25) provided on a side of the gas-liquid separation tank (21) away from the gas delivery pipe (22), wherein the pressure transmitter (25) is connected to the pneumatic shut-off valve (24) via an electrical signal line.

4. The automatic interception device for preventing backflow and liquid leakage according to claim 3 is characterized in that: A shut-off valve (26) is provided on one side of the pressure transmitter (25).

5. The automatic interception device for preventing backflow and liquid leakage according to claim 4 is characterized in that: The gas-liquid separation tank (21) serves as an isolation tank when the material in the static material kettle (4) flows back.

6. The automatic interception device for preventing backflow and liquid leakage according to claim 1 is characterized in that: A drain pipe (5) is provided at one end of the drain outlet (213), and a first drain ball valve (51), a second drain ball valve (52), a filter (53), a steam trap (54), and a third drain ball valve (55) are sequentially provided on the drain pipe (5).

7. The automatic interception device for preventing backflow and liquid leakage according to claim 6 is characterized in that: The drainage pipe (5) is provided with a drainage branch pipe (6) in parallel at the ends of the first drainage ball valve (51) and the third drainage ball valve (55), and a bypass ball valve (61) is provided on the drainage branch pipe (6).

8. The automatic interception device for preventing backflow and liquid leakage according to claim 1 is characterized in that: The steam conveying device (1) comprises a steam sub-cylinder (11), and the steam conveying device (1) is respectively connected to the air inlet (211) of the gas-liquid separation tank (21) and the aging kettle (3) through the steam sub-cylinder (11).

9. The automatic interception device for preventing backflow and liquid leakage according to claim 1, characterized in that: The support at the bottom of the gas-liquid separation tank (21) is connected to the ground using expansion bolts.

10. A control method for the automatic interception device for preventing backflow and liquid leakage according to any one of claims 1 to 9, characterized in that: The steps include: S1. When the pressure in the static material kettle (4) is greater than the steam delivery pressure and causes the material to flow back, the check valve (23) automatically closes the valve due to the material backflow pressure to intercept the backflow material at the first level, and intercepts the backflow material outside the gas-liquid separation tank (21); S2. When the check valve (23) fails or cannot completely intercept the backflow material, the material flows back into the gas-liquid separation tank (21). The pressure transmitter (25) transmits a signal to the solenoid valve of the pneumatic shut-off valve (24) according to the liquid level and pressure in the tank. The pneumatic shut-off valve (24) closes, and the backflow material is intercepted in the second level, and the backflow material is intercepted in the gas-liquid separation tank (21). S3. After the secondary interception takes effect, the material liquid height is insufficient to overflow the entire gas-liquid separation tank (21). The backflow material is intercepted at the third level by utilizing the height of the gas-liquid separation tank (21) and the top air inlet (211), and the backflow material is intercepted in the gas-liquid separation tank (21); S4. Close all valves in the upstream and downstream processes, and open the drain port (213) at the bottom of the gas-liquid separation tank (21) to discharge the material from the drain pipe (5).

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