Tail gas safety treatment device of vacuum system

Abstract

The utility model discloses a tail gas safety treatment device of a vacuum system, which relates to the technical field of tail gas safety treatment, and comprises a storage tank, a vacuum unit, a tail gas condensation component and a low-pressure nitrogen protection device, one end of each vacuum pump is provided with a pipeline communicated with the storage tank, the tail gas condensation assembly comprises a liquid-phase collecting tank, a gas-phase cooling tank and a tail gas condenser, the liquid-phase collecting tank is communicated with the exhaust end of at least one corresponding vacuum pump, the gas-phase cooling tank is communicated with the exhaust ends of other corresponding vacuum pumps, and the tail gas condenser is communicated with the liquid-phase collecting tank. The tail gas condenser is mounted at the top of the gas-phase cooling tank, and the low-pressure nitrogen protection device is mounted at the top of the gas-phase cooling tank. The safety risk of fire disasters caused by static electricity generated by friction in the conveying process of the tail gas in the pipeline is reduced, and the tail gas is always in full-process inert environment control and safe operation.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas safety treatment technology, and in particular to an exhaust gas safety treatment device for a vacuum system. Background Technology

[0002] Vacuum distillation is a process involved in fine chemical production, which requires the use of vacuum equipment. Common vacuum equipment includes oil-free vacuum pumps, water vacuum pumps, water ring pumps, and screw vacuum pumps. Each type has its own advantages and disadvantages, but oil-free vacuum pumps are widely used in fine chemicals due to their significant advantages. Among them, oil-free mechanical vacuum pumps offer stable vacuum levels, low failure rates, and low noise, making them suitable for various solvents with low, medium, and high boiling points.

[0003] Mechanical failures during the operation of vacuum units can lead to leaks in the piping, allowing air to enter. Additionally, the operation of the vacuum unit generates static electricity through friction with residual solvent gases flowing within the pipes, which, upon contact with air, could potentially cause fires or explosions. Therefore, addressing these safety hazards during vacuum unit operation and ensuring the safe and stable operation of the vacuum system is essential. Utility Model Content

[0004] The main purpose of this utility model is to propose a safety treatment device for exhaust gas of a vacuum system, which aims to solve the safety hazards of vacuum unit equipment during operation and ensure the safe and stable operation of the vacuum system in the fine chemical production process.

[0005] To achieve the above objectives, the present invention proposes a vacuum system exhaust gas safety treatment device, comprising:

[0006] Storage tanks;

[0007] The vacuum unit includes multiple vacuum pumps, and the inlet of each vacuum pump is connected to the storage tank through a pipeline;

[0008] The exhaust gas condensation assembly includes a liquid phase collection tank, a gas phase cooling tank, and an exhaust gas condenser. The liquid phase collection tank is connected to the exhaust end of at least one corresponding vacuum pump, the gas phase cooling tank is connected to the exhaust ends of other corresponding vacuum pumps, and the exhaust gas condenser is installed on top of the gas phase cooling tank.

[0009] A low-pressure nitrogen protection device is installed on the top of the vapor phase cooling tank to inject low-pressure nitrogen into the vapor phase cooling tank to maintain an inert environment.

[0010] Preferably, both the vacuum pump and the exhaust gas condenser are equipped with jackets, and the inner cavity of the jackets is filled with a cooling aqueous solution to accelerate heat dissipation.

[0011] Preferably, the top of the storage tank is provided with a wound condenser for initial condensation; and / or,

[0012] The gas phase cooling tank is equipped with a cooling coil for secondary cooling of the residual gas inside.

[0013] Preferably, the low-pressure nitrogen protection device includes:

[0014] Nitrogen cylinder assembly, filled with nitrogen, is used to provide a nitrogen source;

[0015] The pressure regulating structure is connected to the nitrogen cylinder group and the gas phase cooling tank via pipelines, and is used to regulate the nitrogen pressure.

[0016] Preferably, the top of the storage tank is equipped with a pressure relief device to release nitrogen gas to maintain a safe pressure when the pressure inside the tank exceeds a set value.

[0017] Preferably, the device further includes a flame arrester installed at the exhaust port of the exhaust gas condenser. More preferably, the discharge port diameter of the flame arrester is set to be greater than or equal to twice the pipe diameter of the exhaust port.

[0018] Preferably, the storage tank is equipped with a detection device, the detection device comprising:

[0019] A remote vacuum detector is installed on the top of the storage tank to detect the vacuum level inside the tank.

[0020] A remote magnetic float is installed inside the storage tank to detect the liquid level inside the tank.

[0021] Preferably, a gas phase pipe is provided between the gas phase cooling tank and the vacuum unit, and a temperature probe is provided on the gas phase pipe to detect the exhaust gas temperature and feed it back to the control system.

[0022] Preferably, the vacuum pump is provided with an inlet pipe and an outlet pipe at both ends corresponding to the storage tank and the gas phase condenser, and both the inlet pipe and the outlet pipe are provided with connecting hoses.

[0023] Preferably, both the liquid phase collection tank and the gas phase cooling tank are connected to a magnetic pump, and the magnetic pump is connected to a recovery device.

[0024] In the technical solution provided by this utility model, the tail gas condensation assembly includes a liquid phase collection tank, a gas phase cooling tank, and a tail gas condenser. The liquid phase collection tank is connected to the outlet end of at least one corresponding vacuum pump, and the gas phase cooling tank is connected to the outlet ends of other corresponding vacuum pumps. The tail gas condenser is installed on the top of the gas phase cooling tank, and a low-pressure nitrogen protection device is installed on the top of the gas phase cooling tank to inject low-pressure nitrogen into the gas phase cooling tank to maintain an inert environment. This allows for the efficient liquefaction and recovery of volatile solvents in the tail gas, thereby reducing the safety risk of fire caused by static electricity generated during the transportation of solvent tail gas from vacuum distillation in pipelines. Simultaneously, it enables full-process inert environment control of the tail gas treatment process, ensuring the safe and stable operation of the vacuum system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 A perspective view of an embodiment of the exhaust gas safety treatment device for the vacuum system provided by this utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of a medium- and low-pressure nitrogen protection device.

[0028] Explanation of icon numbers:

[0029] 1. Storage tank; 11. Wound condenser; 2. Vacuum unit; 3. Tail gas condensation assembly; 31. Liquid phase collection tank; 32. Gas phase cooling tank; 33. Tail gas condenser; 4. Low-pressure nitrogen protection device; 41. Nitrogen cylinder group; 42. Pressure regulating structure; 5. Flame arrester; 6. Temperature probe; 7. Pressure relief device; 8. Detection device.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] This utility model provides a safety treatment device for exhaust gas in a vacuum system. Figures 1 to 2 This is an embodiment of the exhaust gas safety treatment device for the vacuum system provided by this utility model.

[0035] In existing technologies, vacuum distillation processes in fine chemical production commonly employ vacuum units to treat exhaust gases. Traditional vacuum systems typically rely solely on condensation to recover a portion of the solvent, lacking effective means of maintaining an inert environment and flame-blocking structures. When a mechanical failure of the vacuum pump causes air to enter the pipeline, the flammable solvents in the exhaust gas may come into contact with oxygen, potentially leading to a combustion or explosion accident. This is especially problematic when handling highly volatile solvents, where static electricity buildup exacerbates the safety risks.

[0036] Please refer to the following: Figures 1 to 2 The exhaust gas safety treatment device of the vacuum system includes a storage tank 1, a vacuum unit 2, an exhaust gas condensation assembly 3, and a low-pressure nitrogen protection device 4. The vacuum unit 2 includes multiple vacuum pumps, each with its inlet connected to the storage tank 1 via a pipe. These multiple vacuum pumps can handle exhaust gases from various solvents. The exhaust gas condensation assembly 3 includes a liquid phase collection tank 31, a gas phase cooling tank 32, and an exhaust gas condenser 33. The liquid phase collection tank 31 is connected to the exhaust end of at least one corresponding vacuum pump, and the gas phase cooling tank 32 is connected to the exhaust ends of other corresponding vacuum pumps. The exhaust gas condenser 33 is installed on top of the gas phase cooling tank 32, and the low-pressure nitrogen protection device 4 is installed on top of the gas phase cooling tank 32 to inject low-pressure nitrogen into the gas phase cooling tank 32 to maintain an inert environment.

[0037] Among them, storage tank 1 refers to a hollow container used to store materials to be processed, specifically the solvent distilled under reduced pressure. It can be constructed of welded stainless steel with an anti-corrosion coating on the inner wall to withstand chemical corrosion, or it can be made of glass-lined material. Vacuum unit 2 refers to a pumping unit composed of multiple vacuum pumps, specifically a combination of oil-free mechanical pumps and water ring pumps, with redundancy achieved through parallel piping. Tail gas condensation assembly 3 refers to a device that cools and separates gaseous tail gas into liquid and gas phases; the gas phase cooling tank 32 reduces the gas temperature through a coil-type heat exchanger. Low-pressure nitrogen protection device 4 refers to a device that continuously injects nitrogen into the gas phase cooling tank 32; specifically, a pressure reducing valve can be used to regulate the nitrogen pressure to a certain range, creating an inert atmosphere covering the gas flow path.

[0038] The exhaust gas safety treatment device of the vacuum system is also equipped with a flame arrester 5. The flame arrester 5 is a mechanical structure that prevents the back propagation of flames. Specifically, it can be designed with a metal wire mesh or a corrugated plate, which disperses flame energy through a narrow channel. The flame arrester is installed at the exhaust port of the exhaust gas condenser. The exhaust port diameter of the flame arrester is set to be greater than or equal to twice the pipe diameter of the exhaust port to reduce gas flow rate, reduce flame propagation, and improve the flame arresting effect.

[0039] Specifically, after the gaseous solvent is initially condensed and liquefied by the wound-type initial condenser above the storage tank 1, it is transported to the liquid collection tank 31 via a vacuum pump and pipeline. The collected liquid is then pumped back for recovery. The unliquefied gaseous solvent is transported to the gas phase cooling tank 32 via a vacuum pump and pipeline. It undergoes primary cooling by the jacketed tail gas condenser 33 located above the cooling tank, followed by secondary cooling by the cooling plates inside the cooling tank. The collected liquid is then pumped back for recovery. Low-pressure nitrogen is injected into the gas phase cooling tank 32 from the top to replace the internal oxygen and maintain a positive pressure environment, preventing external air from seeping in. The tail gas condenser 33 further cools the residual gas, and the flame arrester 5 blocks the possible flame propagation path at the outlet. Compared with existing technologies, traditional tail gas treatment devices rely only on a single condensation step, do not inertize the gaseous residue, and lack physical flame-arresting structures. This solution constructs a dual protection mechanism through nitrogen layer coverage and linkage with the flame arrester 5, effectively cutting off the contact conditions between combustibles and oxygen, while simultaneously blocking the flame propagation path.

[0040] Therefore, in the technical solution provided by this utility model, the exhaust gas condensation assembly 3 includes a liquid phase collection tank 31, a gas phase cooling tank 32, and an exhaust gas condenser 33. The liquid phase collection tank 31 is connected to one of the vacuum pumps, and the gas phase cooling tank 32 is connected to the other vacuum pump. The exhaust gas condenser 33 is installed on the top of the gas phase cooling tank 32. The low-pressure nitrogen protection device 4 is installed on the top of the gas phase cooling tank 32 and is used to inject low-pressure nitrogen into the gas phase cooling tank 32 to maintain an inert environment. The flame arrester 5 is installed at the outlet of the exhaust gas condenser 33 and is used to prevent flame propagation. This reduces the safety risk of static electricity generated by friction in the pipeline of highly volatile solvent exhaust gas, and realizes full-process inert environment control and physical flame isolation in the exhaust gas treatment process.

[0041] In the technical solution provided by this utility model, both the vacuum pump and the tail gas condenser 33 are equipped with jackets, and the inner cavity of the jacket is filled with a cooling water solution to accelerate heat dissipation and perform primary cooling on the gas in the gas phase cooling tank 32.

[0042] The jacket refers to a closed cavity structure that encloses the outer surface of the equipment. Specifically, it can be constructed using a double-layered shell structure welded from stainless steel, with its internal cavity forming a circulation channel for the cooling water solution. The cooling water solution can be a low-temperature brine or an ethylene glycol solution. Cooling water injection refers to injecting the liquid medium into the sealed jacket using a circulating pump. This can be achieved using a temperature-controlled circulating water system, with the heat exchange rate controlled by adjusting the inlet water flow rate.

[0043] Specifically, the exhaust gas condenser 33 provides initial cooling for the exhaust gas entering the vapor phase cooling tank 32, and the mechanical heat generated during vacuum pump operation is conducted to the inner wall of the jacket through the metal casing. During the continuous flow of the circulating cooling water solution within the jacket cavity, it absorbs residual heat from the exhaust gas inside the equipment and transfers the heat to the outside of the equipment or temporarily stores it in the cooling water solution, which then releases heat to the outside. In continuous operation, the water temperature inside the jacket is controlled within a predetermined range; for example, a temperature sensor can be used to link with an electric regulating valve to control the inlet water temperature. In some specific embodiments, the jacket can employ a split-type spiral guide plate structure to enhance turbulence, and the circulating water pump set can be equipped with a variable frequency drive to match changes in heat load. The cooling water circuit can be connected to a plate heat exchanger for secondary cooling, and the circulating water tank can be equipped with an automatic water replenishment device to maintain a stable water level.

[0044] Furthermore, a wound condenser 11 is provided on the top of the storage tank 1 for initial condensation.

[0045] The wound condenser 11 is usually made of wound metal tubes and contains a cooling medium, such as cooling water or refrigerant, which increases the heat dissipation area and heat dissipation efficiency. The wound condenser 11 is used to initially complete the condensation of the material inside the storage tank 1, ensuring that the material inside the storage tank 1 can be smoothly pumped out by the vacuum pump and transported to the gas phase cooling tank 32 or the liquid phase collection tank 31.

[0046] The gas phase cooling tank 32 is equipped with a cooling coil for secondary cooling of the residual gas inside.

[0047] The cooling coil inside the vapor phase cooling tank 32 is used for secondary cooling of the residual gas after initial condensation by the wound condenser 11. The cooling coil is also made of a material with good thermal conductivity. A low-temperature cooling medium is introduced into the coil. When the residual gas after initial condensation enters the vapor phase cooling tank 32, it comes into full contact with the surface of the cooling coil during its flow inside the tank. The cooling medium flows in the coil and absorbs heat from the gas, further reducing the temperature of the residual gas. The low-boiling-point components that have not yet condensed condense into liquid after reaching their dew point temperature, thereby achieving deep treatment of the residual gas.

[0048] This application further proposes a low-pressure nitrogen protection device 4, including a nitrogen cylinder group 41, which is connected to the top of the vapor phase cooling tank 32 via a pressure reducing valve and pipeline to provide a low-pressure nitrogen source. A liquid nitrogen storage tank is equipped with a vaporizer and a pressure regulating valve for replenishing nitrogen in cryogenic environments. A nitrogen generator produces nitrogen in real time using air separation technology and connects it to the system. The nitrogen cylinder group 41, liquid nitrogen storage tank, vaporizer, and nitrogen generator are three different nitrogen sources, providing suitable nitrogen replenishment methods in different environments. Simultaneously, the pressure regulating valve adjusts the nitrogen pressure entering the vapor phase cooling tank 32 to prevent excessive pressure.

[0049] Specifically, in the embodiments of this utility model, the low-pressure nitrogen protection device 4 includes a nitrogen cylinder group 41 and a pressure regulating structure 42. The nitrogen cylinder group 41 is filled with nitrogen and is equipped with a liquid nitrogen storage tank and a nitrogen generator to provide a nitrogen source. The pressure regulating structure 42 is connected to the nitrogen cylinder group 41 through a pipeline and is also connected to the gas phase cooling tank 32 to regulate the nitrogen pressure.

[0050] Among them, nitrogen cylinder group 41 refers to the container group for storing compressed nitrogen. Specifically, it can be implemented by multiple steel cylinders connected in parallel. After the high-pressure nitrogen is adjusted to a low-pressure state by the pressure reducing valve, it is delivered to the top of the vapor phase cooling tank 32. Its function is to provide a basic nitrogen supply source for the system. The pressure reducing valve is part of the pressure regulating structure 42. The nitrogen delivered to the vapor phase cooling tank 32 is reduced from high pressure to low pressure in advance by the pressure reducing valve. At the same time, it is also equipped with a detection device to detect whether the pressure reaches the preset standard, so as to prevent the nitrogen input into the vapor phase nitrogen tank from not meeting the requirements of low-pressure nitrogen.

[0051] In practical implementation, the pressure regulating structure 42 can simultaneously connect to three nitrogen sources. For example, nitrogen cylinder group 41 is connected to the top of the vapor phase cooling tank 32 via a pipeline. When the system is running, the pressure reducing valve regulates the high-pressure nitrogen in the cylinder to a safe pressure and then continuously inputs it into the tank, forming an inert gas covering layer. When the ambient temperature is lower than a set threshold, the vaporizer of the liquid nitrogen storage tank starts to convert liquid nitrogen into gas, which, after being controlled by the pressure regulating valve, forms a parallel gas supply path with nitrogen cylinder group 41. The nitrogen generator compresses ambient air into the separation unit through an air compressor, and after oxygen is adsorbed by a molecular sieve, it outputs high-purity nitrogen, which is directly connected to the gas supply pipeline to form a dynamic replenishment. The three nitrogen supply devices are linked and controlled by pressure sensors, prioritizing the nitrogen generator to output nitrogen. When the nitrogen output is insufficient, it automatically switches to nitrogen cylinder group 41 and liquid nitrogen storage tank for gas supply. This effectively solves the problem of inert environment destruction caused by insufficient nitrogen supply in low-temperature environments and prevents external oxygen from seeping into the vapor phase cooling tank 32 and causing a combustion and explosion accident. The coordinated operation of the three nitrogen supply units ensured the stability of nitrogen concentration, avoided the risk of system downtime caused by a single gas source failure, and guaranteed the safety of the vacuum exhaust gas treatment process.

[0052] Furthermore, a pressure relief device 7 is installed on the top of the storage tank 1 to release nitrogen gas to maintain a safe pressure when the pressure inside the tank exceeds a set value.

[0053] The nitrogen pressure relief device is a component that regulates pressure by releasing nitrogen. Specifically, it can be implemented using a structure that links a pressure sensor with a solenoid valve. When the internal pressure of storage tank 1 reaches a preset threshold, nitrogen release is automatically triggered. The set value refers to the highest safe pressure parameter that storage tank 1 can withstand. This can be preset using a pressure control module, for example, by using a programmable logic controller to set the pressure range from 0.5 MPa to 1.0 MPa.

[0054] Specifically, when the pressure inside storage tank 1 abnormally increases due to the operation of vacuum unit 2 or changes in external ambient temperature, the nitrogen pressure relief device monitors the pressure data in real time and initiates nitrogen release the instant the pressure reaches the preset upper limit. Nitrogen is injected into the inner cavity of storage tank 1 through the top pipe, reducing the oxygen concentration in the mixed gas inside the tank through inert gas replacement, and simultaneously reducing the internal pressure through the volume expansion effect, thus preventing storage tank 1 from experiencing sealing failure or structural damage due to overpressure.

[0055] Specifically, in the technical solution of this utility model, the storage tank 1 is equipped with a detection device 8 for detecting the vacuum degree or liquid level.

[0056] The detection device 8 is used to monitor the vacuum pressure and liquid storage volume inside the storage tank 1 in real time. Specifically, it can be implemented using a combination of a vacuum pressure sensor and a liquid level sensor, converting physical quantity signals into electrical signals for data acquisition. The vacuum level refers to the pressure inside the storage tank 1 being lower than atmospheric pressure. This can be achieved using a differential pressure sensor or a capacitive vacuum gauge, calculating the pressure value by measuring the collision frequency of gas molecules or the change in dielectric constant. The liquid level refers to the vertical distance between the liquid surface and the reference surface inside the storage tank 1. This is typically achieved using a float-type liquid level gauge or an ultrasonic liquid level gauge, calculating the liquid level position based on buoyancy or the time difference of sound wave reflection.

[0057] Specifically, a vacuum detection device 8 is installed on the top of storage tank 1. This device transmits real-time pressure changes within the tank to the control system via a pressure sensor. When the vacuum level falls below a safe threshold, an alarm is triggered or a gas replenishment device is activated. A liquid level detection device 8 is installed on the side wall or bottom of storage tank 1. This device monitors liquid level fluctuations using a magnetic float or ultrasonic probe. When the liquid level exceeds a preset range, it can activate the drain pump or feed valve. The data acquisition module of the detection device 8 communicates with the control system to achieve dynamic balance adjustment between vacuum and liquid level, preventing gas leaks due to abnormal pressure or overflow risks caused by excessively high liquid levels.

[0058] Furthermore, the discharge port diameter of the flame arrester 5 needs to be limited to ensure that the flame is completely blocked. Specifically, in the technical solution of this utility model, the flame arrester 5 is installed at the exhaust port of the exhaust gas condenser 33, and the discharge port diameter of the flame arrester 5 is set to be greater than or equal to twice the pipe diameter of the exhaust port.

[0059] Specifically, in the technical solution of this utility model, the storage tank 1 is provided with a detection device 8, which includes a remote vacuum gauge and a remote magnetic flip plate. The remote vacuum gauge is installed on the top of the storage tank 1 and is used to detect the vacuum degree inside the storage tank 1. The remote magnetic flip plate is installed in the inner cavity of the storage tank 1 and is used to detect the liquid level height inside the inner cavity of the storage tank 1.

[0060] The remote vacuum gauge refers to a device that combines a pressure sensing element with a signal transmission module. Specifically, it can be implemented using a vacuum detection module with a pressure sensor and a wireless transmission circuit. It collects real-time pressure changes inside the storage tank 1 and converts them into electrical signals, which are then transmitted to the control system for vacuum monitoring. The remote magnetic float is a liquid level measurement device based on the principle of magnetic coupling. Specifically, it can be implemented using a transparent tube with a built-in magnetic float and an external magnetic float indicator in conjunction with a remote signal converter. The float moves with the liquid level, causing the magnetic float to flip, and simultaneously converts the liquid level data into an electrical signal, which is then transmitted to the monitoring terminal.

[0061] Specifically, the remote vacuum gauge is fixed to the top of storage tank 1. It continuously monitors the vacuum level inside the tank via a pressure sensor. When the detected vacuum level deviates from the set range, it immediately sends an alarm signal to the control system, triggering the pressure relief device or the vacuum pump to start / stop. A remote magnetic flap is vertically installed on the inner wall of storage tank 1. Its magnetic float rises and falls with the liquid level, causing the external flap to display the liquid level. Simultaneously, the liquid level data is transmitted in real-time to the control room via the remote module. When the liquid level exceeds the safety threshold, the system automatically starts the magnetic pump to transfer the liquid to the recovery device.

[0062] Furthermore, it is proposed that a gas phase pipe is provided between the gas phase cooling tank 32 and the vacuum unit 2, and a temperature probe 6 is provided on the gas phase pipe to detect the exhaust gas temperature and feed it back to the control system.

[0063] The vapor phase pipe refers to the pipe structure connecting the vapor phase cooling tank 32 and the vacuum unit 2. It can be made of stainless steel or a corrosion-resistant alloy and is used to transport the exhaust gas generated by the vacuum unit 2. The temperature probe 6 is a sensor device installed on the outer wall or inner cavity of the vapor phase pipe. It can be implemented using a thermocouple or an infrared temperature measurement module and is used to monitor the temperature changes of the exhaust gas flowing within the vapor phase pipe in real time. Feedback to the control system refers to transmitting the exhaust gas temperature data collected by the temperature probe 6 to the central processing unit. This can be achieved using wired transmission or a wireless communication protocol and is used to dynamically adjust the operating parameters of the vacuum unit 2 based on the temperature data.

[0064] Specifically, the vapor phase pipe serves as the exhaust gas delivery channel, and its internal temperature changes directly reflect the operating status of vacuum unit 2. Temperature probe 6 continuously collects exhaust gas temperature data from the vapor phase pipe and transmits this data to the control system in real time. When the exhaust gas temperature exceeds a preset threshold, the control system can immediately trigger a safety response mechanism, such as reducing the vacuum pump speed, initiating the cooling program of the vapor phase cooling tank 32, or cutting off the power supply to vacuum unit 2, thereby preventing abnormal temperature increases caused by static electricity or mechanical failure.

[0065] The temperature inside the storage tank 1 also needs to be controlled. In the embodiment provided by this utility model, a wound condenser 11 is provided on the top of the storage tank 1 to control the temperature inside the storage tank 1.

[0066] The wound condenser 11 is a heat exchange device that contacts the surface of the storage tank 1 via a coiled pipe. Specifically, it can be implemented by spirally coiling copper or stainless steel pipes along the outer wall of the storage tank 1 and connecting them to a refrigerant circulation system. The refrigerant flows through the pipes, carrying away heat from inside the storage tank 1, lowering the temperature of the internal gaseous solvent, inhibiting solvent evaporation, and reducing the risk of gas accumulation. Temperature control within the storage tank 1 refers to the active adjustment of the temperature of the gaseous space inside the storage tank 1. This can be achieved through real-time monitoring by a temperature sensor and interlocked control with the refrigerant flow of the wound condenser 11. Maintaining the temperature below the solvent's flash point prevents aerosol explosions caused by high temperatures.

[0067] Specifically, when localized heat is generated inside storage tank 1 due to the operation of vacuum unit 2, the refrigerant in the wound condenser 11 exchanges heat with the outer wall of storage tank 1 through pipes. After contacting the cryogenic tank wall, the gaseous solvent inside storage tank 1 partially condenses into a liquid state, reducing the concentration of combustible gases in the gas phase space. For example, during solvent distillation, the refrigerant flow rate can be dynamically adjusted based on feedback from the temperature sensor inside storage tank 1 to ensure that the temperature remains below a safe threshold.

[0068] Furthermore, the vacuum pump is provided with inlet pipes and outlet pipes at both ends corresponding to the storage tank 1 and the gas phase condenser, and connecting hoses are provided on both the inlet pipes and the outlet pipes.

[0069] The inlet pipeline refers to the fluid transmission channel connecting the vacuum pump and storage tank 1. It can be made of metal pipe or corrosion-resistant composite material and its function is to establish a flow path for the gaseous medium to maintain the airtightness of the vacuum system. The flexible connection refers to a pipeline connection method achieved through a flexible structure, specifically using corrugated hoses, rubber hoses, or metal braided hoses. Its function is to buffer mechanical vibration and displacement, reducing stress concentration at the interface caused by rigid connections, thereby reducing the risk of seal failure due to equipment vibration.

[0070] Specifically, one end of the inlet pipe is fixedly connected to the outlet of storage tank 1 via a flange or clamp, and the other end is connected to the inlet of the vacuum pump via a flexible connector. During the operation of the vacuum pump, vibrations generated by mechanical movement are transmitted through the inlet pipe. The elastic deformation characteristics of the flexible connector absorb lateral or axial displacement, preventing cracks or loosening between the pipe and equipment interface due to vibration and impact. Thus, the airtightness of the system is maintained, preventing external air from entering the pipe through leak points and mixing with solvent vapors, thereby eliminating the potential hazard of explosion caused by static electricity accumulation.

[0071] After the exhaust gas is condensed, it still needs to be recycled. Specifically, in the embodiment of this utility model, the liquid phase collection tank 31 and the gas phase cooling tank 32 are both connected to a magnetic pump, and the magnetic pump is connected to a recycling device.

[0072] Among them, the magnetic pump refers to a leak-free pump driven by magnetic coupling. Specifically, it can be implemented using a fully enclosed magnetic drive structure. Its internal rotor and drive shaft transmit torque through a magnetic coupling, avoiding the risk of media leakage caused by mechanical seals. The recovery device refers to equipment used to process collected liquids or gases. Specifically, it can be implemented using multi-stage separation tanks or adsorption filtration systems, used for centralized treatment or reuse of solvents or liquid residues in exhaust gases.

[0073] Specifically, the liquid phase collection tank 31 and the gas phase cooling tank 32 are connected to the inlet end of the magnetic pump via pipelines, and the outlet end of the magnetic pump is connected to the recovery device via a delivery pipeline. During system operation, the cooling water, liquid solvent or condensate accumulated in the liquid phase collection tank 31 and the residual liquid deposited in the gas phase cooling tank 32 are simultaneously extracted by the magnetic pump and transported to the recovery device for centralized treatment. The shaftless design of the magnetic pump eliminates static electricity generated by mechanical friction and prevents the internal medium of the pump from contacting the external air, thereby blocking combustion conditions. The simultaneous and safe delivery of liquid and gaseous residues in the exhaust gas of the vacuum system effectively prevents the risk of fire caused by pump leakage or static electricity. At the same time, the centralized treatment of solvents through the recovery device avoids environmental pollution caused by the direct emission of harmful substances.

[0074] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A safety treatment device for exhaust gas in a vacuum system, applied to vacuum distillation, characterized in that, include: Storage tanks; The vacuum unit includes multiple vacuum pumps, and the inlet of each vacuum pump is connected to the storage tank via a pipeline; The exhaust gas condensation assembly includes a liquid phase collection tank, a gas phase cooling tank, and an exhaust gas condenser. The liquid phase collection tank is connected to the outlet end of at least one corresponding vacuum pump, the gas phase cooling tank is connected to the outlet ends of other corresponding vacuum pumps, and the exhaust gas condenser is installed on the top of the gas phase cooling tank. A low-pressure nitrogen protection device is installed on the top of the vapor phase cooling tank to inject low-pressure nitrogen into the vapor phase cooling tank to maintain an inert environment.

2. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, Both the vacuum pump and the exhaust gas condenser are equipped with jackets, and the inner cavity of the jackets is filled with a cooling water solution to accelerate heat dissipation and perform primary cooling of the gas.

3. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, The top of the storage tank is equipped with a wound condenser for preliminary condensation of the gas; and / or, The gas phase cooling tank is equipped with a cooling coil for secondary cooling of the residual gas inside.

4. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, The low-pressure nitrogen protection device includes: Nitrogen cylinder assembly, filled with nitrogen, is used to provide a nitrogen source; The pressure regulating structure is connected to the nitrogen cylinder group and the gas phase cooling tank via pipelines, and is used to regulate the nitrogen pressure.

5. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, It also includes a flame arrester, which is installed at the exhaust port of the exhaust gas condenser, and the exhaust port diameter of the flame arrester is set to be greater than or equal to twice the pipe diameter of the exhaust port.

6. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, The top of the storage tank is equipped with a pressure relief device, which is used to release nitrogen gas to maintain a safe pressure when the pressure inside the tank exceeds a set value.

7. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, The storage tank is equipped with a detection device, which includes: A remote vacuum detector is installed on the top of the storage tank to detect the vacuum level inside the tank. A remote magnetic float is installed inside the storage tank to detect the liquid level inside the tank.

8. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, A gas phase pipe is installed between the gas phase cooling tank and the vacuum unit. A temperature probe is installed on the gas phase pipe to detect the exhaust gas temperature and feed it back to the control system.

9. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, The vacuum pump is equipped with inlet and outlet pipes at both ends corresponding to the storage tank and the gas phase condenser, and both the inlet and outlet pipes are equipped with connecting hoses.

10. The exhaust gas safety treatment device for a vacuum system as described in claim 1, characterized in that, Both the liquid phase collection tank and the gas phase cooling tank are connected to a magnetic pump, and the magnetic pump is connected to a recovery device.

Images