A volatile solvent inert atmosphere closed-loop recycling proportioning device

Abstract

This invention provides a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere, specifically relating to the technical field of chemical separation and environmental protection equipment. It includes a closed-loop inert atmosphere assurance module, a solvent supply control module, a gas-liquid mixing and proportioning module, and a condensation and recovery circulation module, all connected in a closed loop. Each module is sealed and connected via a closed pipeline, forming an integrated closed-loop flow channel for solvent storage, transportation, proportioning, and recovery. During operation, an inert gas storage tank introduces inert gas into the system. The volatile solvent in the solvent storage tank, under the pressure of the inert gas and precisely controlled by a flow rate setpoint valve, is sent to the proportioning and mixing chamber, where it merges with the inert gas and is uniformly mixed through a static mixing component. The mixed fluid enters a shell-and-tube cooling channel for heat exchange and condensation. The solvent is recycled, and the inert gas is recirculated, forming a double closed-loop cycle. This invention provides precise proportioning and is suitable for the closed-loop storage, precise proportioning, and efficient recovery of volatile solvents in fine chemicals, pharmaceutical synthesis, and other fields.

Description

Technical Field

[0001] This invention provides a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere, specifically relating to the technical field of chemical separation and environmental protection equipment. Background Technology

[0002] As key basic materials in strategic emerging industries such as fine chemicals, pharmaceutical synthesis, and electronic material preparation, the safety, accuracy, and environmental friendliness of volatile solvents in their storage, transportation, proportioning, and recycling processes directly affect production stability, cost control, and compliant operation. Currently, the industry's storage, transportation, and proportioning equipment for volatile solvents is still mainly based on open or semi-closed structures. There is a lack of integrated specialized equipment adapted for inert atmosphere protection and closed-loop recycling, which can no longer meet the technical specifications and industrial upgrading needs of high-end equipment manufacturing and energy-saving and environmental protection industries. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere, which can effectively solve the related technical problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A closed-loop recovery and proportioning device for volatile solvents under inert atmosphere includes an inert atmosphere protection module, a solvent supply control module, a gas-liquid mixing and proportioning module, and a condensation recovery and circulation module, which are connected in a closed loop according to the process flow sequence. The modules are connected to each other through sealed pipelines to form an integrated closed-loop flow channel for solvent storage, transportation, proportioning, and recovery under inert atmosphere. The inert atmosphere protection module includes an inert gas storage tank, which is connected to a solvent storage tank and a mixing chamber via branch pipelines. It is used to introduce inert gas into the entire closed-loop system to replace air and maintain a stable inert positive pressure atmosphere inside the system. The solvent supply control module includes a solvent storage tank and a flow rate control valve. The solvent storage tank is a sealed, pressure-resistant vertical cylindrical structure used to hold volatile solvents. The flow rate control valve is connected in series on the delivery pipeline between the solvent storage tank and the mixing chamber to regulate the solvent delivery flow rate. The gas-liquid mixing and proportioning module includes a mixing chamber, which is used to achieve a uniform mixing ratio of volatile solvent and inert gas, and to stabilize the gas-liquid two-phase flow state. The condensation recovery circulation module includes a sleeve-type cooling channel and a reflux valve. The sleeve-type cooling channel contains a cooling medium for heat exchange and condensation of the gas-liquid mixture. The reflux valve is connected in series on the reflux pipeline between the reflux outlet of the mixing chamber, the condensate outlet of the sleeve-type cooling channel, and the solvent storage tank to achieve closed-loop reflux circulation of the solvent after condensation.

[0005] Furthermore, the solvent storage tank is provided with an inert gas interface at the top for communication with the inert gas storage tank; a liquid phase outlet at the bottom for communication with the inlet end of the flow rate setpoint valve; and a reflux interface on the side wall of the tank for communication with the outlet end of the reflux valve.

[0006] Furthermore, the mixing chamber includes a chamber body, a mixing flange, a static mixing component fixing plate, and a static mixing component; The cavity is a hollow cylindrical structure, which constitutes the main outer shell of the mixing cavity; The mixing flange includes an upper mixing flange and a lower mixing flange, which are symmetrically fixed at the upper and lower ends of the cavity. The upper mixing flange is provided with a gas phase outlet, and the lower mixing flange is provided with a solvent inlet. The static mixing component fixing plate is horizontally snapped into the lower section inside the cavity; The static mixing component is vertically mounted above the static mixing component fixing plate, and its upper end is fixedly connected to the annular lip inside the cavity.

[0007] Furthermore, the inner wall of the cavity is provided with a guide groove in the circumferential direction, and the static mixing component fixing plate is fixed in the cavity through the guide groove; An inert gas inlet is provided on the upper part of the outer wall of the cavity.

[0008] Furthermore, the static mixing component fixing plate is a circular plate with a central mounting hole through which a central shaft passes through the center of the plate, and multiple medium flow holes are evenly distributed around the central mounting hole; The outer edge of the static mixing component fixing plate is provided with multiple positioning protrusions, and the outer diameter of the positioning protrusions is adapted to the guide groove.

[0009] Furthermore, the static mixing assembly includes a central shaft, static mixing blades, and a mounting end plate. The central shaft is a solid cylindrical rod that forms the supporting skeleton of the assembly. The static mixing blades are spirally and continuously fixed along the central shaft axis. The mounting end plate is fixed to one end of the central shaft, and a number of through holes for solvent flow are opened on the plate.

[0010] Furthermore, the sleeve-type cooling channel includes a tank body, two tube sheets, straight pipes, and a cooling flange; The tank body is a horizontal cylindrical shell, which forms the main outer shell of the cooling channel; The tube sheet is horizontally fixed to the left and right ends of the tank body, and is a circular plate. The straight tube consists of multiple parallel heat exchange tubes that vertically penetrate and are fixed between the two tube sheets, with both ends sealed to the tube sheets respectively. The cooling flange includes a front cooling flange and a rear cooling flange, which are respectively sealed and fixed at the two ends of the tank body; the front cooling flange is provided with a process gas inlet and is connected to the gas phase outlet of the mixing chamber; the rear cooling flange is provided with a process gas outlet and is connected to the inert gas storage tank.

[0011] Furthermore, the upper part of the tank has a cooling medium inlet, and the bottom has a condensate outlet, which is connected to the reflux valve through a pipeline.

[0012] Furthermore, the inner cavity of the tube sheet is fitted with an insert, and the outer peripheral surface of the insert is fitted with an O-ring.

[0013] Compared with the known prior art, the technical solution provided by this invention has the following beneficial effects: First, the entire system is protected by an inert atmosphere, ensuring high safety and stability: This invention incorporates an inert atmosphere protection module, which introduces inert gas from an inert gas storage tank into the entire system and maintains a stable positive pressure, achieving full-process air replacement and inert atmosphere-sealed protection. This prevents volatile solvents from contacting air, eliminates the risks of oxidation, deterioration, flammability, and explosion, significantly improves system operational safety, and ensures stable material quality.

[0014] Secondly, the solvent supply is precise and controllable, with high mixing accuracy and good consistency: The present invention is equipped with a flow setpoint valve in the solvent supply control module, which can accurately, continuously and stably regulate the flow rate of volatile solvents, avoiding flow fluctuations and mixing deviations caused by manual adjustment or simple valves, ensuring that the solvent and inert gas ratio is uniform and stable, and meeting the requirements of refined production processes.

[0015] Third, the gas-liquid mixing is uniform and thorough, and the two-phase flow is stable: The gas-liquid mixing and proportioning module of the present invention is equipped with a proportioning and mixing chamber and a built-in static mixing component. Through the cutting and diversion of the static mixing blades and the multiple back-turn disturbances, the volatile solvent and the inert gas are fully and uniformly mixed, and the two-phase flow is stable. This effectively avoids problems such as gas-liquid stratification, local flow deviation, and uneven mixing, and improves the efficiency of subsequent condensation and recovery.

[0016] Fourth, high condensation recovery efficiency, low solvent loss, and good environmental performance: This invention features a condensation recovery circulation module that uses a sleeve-type cooling channel for efficient heat exchange and condensation of the mixed gas-liquid two-phase flow, ensuring that solvent vapor is fully condensed into liquid. Combined with a reflux valve, the condensate is returned to the solvent storage tank in a closed loop, while the inert gas is returned to the storage tank, forming a double closed-loop circulation. This significantly reduces solvent evaporation loss, improves solvent recovery rate, and is energy-saving, environmentally friendly, and meets green production requirements. Attached Figure Description

[0017] Figure 1This is a main view of the closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere proposed in this invention. Figure 2 This is a structural diagram of the solvent storage tank of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere proposed in this invention. Figure 3 This is a structural diagram of the mixing chamber of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere, as proposed in this invention. Figure 4 This is a cavity structure diagram of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere proposed in this invention; Figure 5 This is a structural diagram of the static mixing component fixing plate of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere, as proposed in this invention. Figure 6 This is a static mixing component structure diagram of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere proposed in this invention. Figure 7 This is a diagram of a sleeve-type cooling channel structure for a closed-loop recovery and proportioning device for volatile solvents in an inert atmosphere, as proposed in this invention. Figure 8 This is a tank structure diagram of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere proposed in this invention; Figure 9 This is a tube sheet structure diagram of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere proposed in this invention; Figure 10 This is a straight pipe structure diagram of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere proposed in this invention.

[0018] The labels in the diagram represent: 1-Inert atmosphere protection module, 11-Inert gas storage tank, 2-Solvent supply control module, 21-Solvent storage tank, 211-Inert gas interface, 212-Liquid phase outlet, 213-Reflux interface, 22-Flow setpoint valve, 3-Gas-liquid mixing and proportioning module, 31-Proportioning mixing chamber, 311-Cavity body, 3111-Annular lip, 3112-Guide groove, 3113-Inert gas inlet, 312-Mixing flange, 3121-Upper mixing flange, 31211-Gas phase outlet, 3122-Lower mixing flange, 31221-Solvent inlet, 313-Static mixing component fixing plate, 3131-Positioning protrusion 314-Static mixing assembly, 3141-Central shaft, 3142-Static mixing blades, 3143-Mounting end plate, 4-Condensation recovery circulation module, 41-Shell-type cooling channel, 411-Tank body, 4111-Cooling medium inlet, 4112-Condensate outlet, 412-Tube sheet, 4121-Insert, 41211-O-ring, 413-Straight pipe, 4131-Straight bar turbulence structure, 41311-Straight bar turbulence rib, 414-Cooling flange, 4141-Front-end cooling flange, 4142-Rear-end cooling flange, 41411-Process gas inlet, 41421-Process gas outlet, 42-Return valve. Detailed Implementation

[0019] The present invention will be further described below with reference to embodiments.

[0020] Current storage, transportation, and mixing equipment for volatile solvents has the following key drawbacks: Firstly, the lack of a safety protection system results in significant risks of combustion, explosion, and oxidation: Most existing equipment lacks an inert positive pressure protection environment, allowing direct contact with air during solvent storage, transportation, and mixing. This makes it prone to forming explosive gas mixtures due to solvent evaporation and easily triggering solvent oxidation and deterioration, affecting product quality. Some simple protection devices only use local nitrogen purging, failing to achieve system-wide air replacement and stable positive pressure maintenance. The continuity and uniformity of the inert atmosphere are insufficient, leading to poor reliability of safety protection.

[0021] Secondly, the controllability of proportioning accuracy is poor, resulting in high material loss and costs: Traditional proportioning processes rely heavily on manual adjustment or simple valves to control flow, lacking precise setpoint control mechanisms. This easily leads to fluctuations in solvent delivery flow and large deviations in proportioning, making it difficult to meet the proportioning accuracy requirements of refined production. At the same time, the open structure results in significant solvent evaporation and loss, not only wasting raw materials but also increasing production costs, which is inconsistent with the industrial orientation of resource recycling.

[0022] Third, the efficiency of volatile solvent recovery is low, and environmental compliance is insufficient: most existing equipment lacks a dedicated condensation recovery structure or only uses a single-stage simple condensation device, resulting in low heat exchange efficiency, incomplete condensation of solvent vapors, and direct emission of large amounts of volatile organic compounds, which pollutes the environment and does not meet the emission control requirements of the energy-saving and environmental protection industry. Furthermore, the recovered solvent lacks a closed-loop reflux circulation design, making it prone to secondary evaporation losses, resulting in low recovery and utilization rates and making it difficult to achieve closed-loop recycling of the solvent.

[0023] Fourth, the system suffers from low integration and poor sealing and circulation stability: Currently, storage, transportation, proportioning, and recovery processes are mostly composed of independent, piecemeal equipment with poor pipeline sealing, making them prone to solvent leakage and inert gas loss. The lack of closed-loop linkage design in each stage results in poor gas-liquid mixing uniformity, unstable two-phase flow, and susceptibility to pipeline blockage, gas-liquid cross-flow, and other malfunctions. Furthermore, the equipment lacks continuous operational stability and is ill-suited to the demands of continuous industrial production.

[0024] To overcome the aforementioned drawbacks, the present invention employs the following embodiments to address the current situation.

[0025] Example 1: Reference Appendix Figure 1 This is a system diagram of a closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere. It includes an inert atmosphere protection module 1, a solvent supply control module 2, a gas-liquid mixing and proportioning module 3, and a condensation recovery and circulation module 4, which are connected in a closed loop according to the process flow sequence. The modules are connected to each other through sealed pipelines to form an integrated closed-loop flow channel for solvent storage, transportation, proportioning, and recovery under an inert atmosphere. The inert atmosphere protection module 1 includes an inert gas storage tank 11, which is connected to a solvent storage tank 21 and a mixing chamber 31 via branch pipelines. It is used to introduce inert gas into the entire closed-loop system to replace air and maintain a stable inert positive pressure atmosphere inside the system. The solvent supply control module 2 includes a solvent storage tank 21 and a flow rate control valve 22. The solvent storage tank 21 is a sealed, pressure-resistant vertical cylindrical structure used to hold volatile solvents. The flow rate control valve 22 is connected in series on the delivery pipeline between the solvent storage tank 21 and the mixing chamber 31 to regulate the solvent delivery flow rate. The gas-liquid mixing and proportioning module 3 includes a proportioning and mixing chamber 31, which is used to complete the uniform mixing and proportioning of volatile solvents and inert gases, and to stabilize the gas-liquid two-phase flow state. The condensation recovery circulation module 4 includes a sleeve-type cooling channel 41 and a reflux valve 42. The sleeve-type cooling channel 41 contains a cooling medium for heat exchange and condensation of the gas-liquid mixture. The reflux valve 42 is connected in series on the reflux pipeline between the reflux outlet of the proportioning mixing chamber 31, the condensate outlet of the sleeve-type cooling channel 41, and the solvent storage tank 21 to realize the closed-loop reflux circulation of the solvent after condensation.

[0026] In this example, the device establishes an inert positive pressure environment by introducing inert gas into the system through the inert gas storage tank 11 of the inert atmosphere protection module 1; in the solvent supply control module 2, the volatile solvent in the solvent storage tank 21 is pushed by the inert gas pressure and then sent to the proportioning mixing chamber 31 after being regulated by the flow setpoint valve 22; the inert gas is sent into the proportioning mixing chamber 31 through the pipeline to merge with the solvent, and uniform mixing and two-phase flow stabilization are achieved through the static mixing component 314; the mixed gas-liquid two-phase flow enters the sleeve-type cooling channel 41 of the condensation recovery circulation module 4 for heat exchange and condensation, the solvent vapor is condensed into liquid and flows back to the solvent storage tank 21, and the uncondensed inert gas flows back to the inert gas storage tank 11, forming a double closed-loop circulation.

[0027] like Figure 2 As shown, in another embodiment, the solvent storage tank 21 is provided with an inert gas interface 211 at the top for communication with the inert gas storage tank 11, and a liquid phase outlet 212 at the bottom for communication with the inlet end of the flow rate setpoint valve 22. The tank side wall is provided with a reflux interface 213 for communication with the outlet end of the reflux valve 42.

[0028] The solvent storage tank 21 is equipped with an inert gas interface 211 at the top, which can reliably connect to the inert gas storage tank 11 to ensure a stable flow of inert gas into the tank, maintain positive inert pressure inside the tank, isolate air, and prevent solvent oxidation, volatilization, and the risk of combustion and explosion. The solvent storage tank 21 is equipped with a liquid phase outlet 212 at the bottom, which can be sealed and connected to the inlet end of the flow rate set valve 22 to ensure a stable and continuous flow of solvent, providing a reliable liquid phase supply for subsequent precise proportioning. The solvent storage tank 21 is equipped with a reflux interface 213 on the side wall, which can be sealed and connected to the outlet end of the reflux valve 42 to receive the condensed and recovered liquid solvent, realizing closed-loop reflux and recycling of solvent, reducing losses and improving utilization.

[0029] like Figure 3 As shown, in one embodiment, the proportioning mixing chamber 31 includes a chamber 311, a mixing flange 312, a static mixing component fixing plate 313, and a static mixing component 314; The cavity 311 has a hollow cylindrical structure, which constitutes the main outer shell of the mixing cavity 31; The mixing flange 312 includes an upper mixing flange 3121 and a lower mixing flange 3122, which are symmetrically fixed at the upper and lower ends of the cavity 311. The upper mixing flange 3121 is provided with a gas phase outlet 31211, and the lower mixing flange 3122 is provided with a solvent inlet 31221. The static mixing component fixing plate 313 is horizontally snapped into the lower section inside the cavity 311; The static mixing component 314 is vertically mounted above the static mixing component fixing plate 313, and its upper end is fixedly connected to the annular lip 3111 inside the cavity 311.

[0030] The cavity 311 is a hollow cylindrical outer shell, providing a sealed, pressure-resistant, and structurally stable working space for gas-liquid mixing, ensuring the mixing process is safe and stable under an inert atmosphere. The mixing flange 312 includes an upper mixing flange 3121 and a lower mixing flange 3122, which are fixed to the upper and lower ends of the cavity 311 respectively, achieving sealing of the upper and lower openings of the cavity 311, facilitating pipeline connection, and ensuring the overall airtightness of the system. The upper mixing flange 3121 is provided with a gas phase outlet 31211 for discharging the mixed gas-liquid two-phase flow; the lower mixing flange 3122... Flange 3122 is equipped with solvent inlet 31221 for introducing solvent, realizing orderly entry and exit of gas and liquid media and controllable flow direction; the static mixing component fixing plate 313 is horizontally fixed in the lower section of the cavity 311, providing a stable installation foundation for the static mixing component 314, ensuring that the component position is fixed and the operation is reliable; the static mixing component 314 is vertically installed above the fixing plate and fixed with the annular lip 3111 of the cavity 311, forcibly mixing and splitting the solvent and inert gas, realizing uniform proportioning, stabilizing the two-phase flow state, and improving the mixing quality.

[0031] like Figure 4 As shown, in one embodiment, the inner wall of the cavity 311 is provided with a guide groove 3112 in the circumferential direction, and the static mixing component fixing plate 313 is fixed in the cavity 311 through the guide groove 3112; An inert gas inlet 3113 is provided on the upper part of the outer wall of the cavity 311.

[0032] The inner wall of the cavity 311 is provided with a guide groove 3112. The static mixing component fixing plate 313 can slide into the vertical section of the guide groove 3112 and be locked at the end of the horizontal section of the guide groove 3112 after rotation to achieve fixation. An inert gas inlet 3113 is opened at the upper part of the cavity 311 to stably introduce inert gas into the mixing cavity, ensuring that the inert gas and the solvent are fully in contact and mixed, and maintaining the inert atmosphere in the cavity.

[0033] like Figure 5As shown, in one embodiment, the static mixing component fixing plate 313 is a circular plate with a central mounting hole through which the central shaft passes through the center of the plate, and a plurality of medium flow holes are evenly distributed around the central mounting hole. The static mixing component fixing plate 313 has a plurality of positioning protrusions 3131 on its outer edge, and the outer diameter of the positioning protrusions 3131 is adapted to the guide groove 3112.

[0034] The static mixing component fixing plate 313 has a central mounting hole for the central shaft of the static mixing component to pass through and position, ensuring good coaxiality, firm installation, and stable rotation of the component. Multiple medium flow holes are formed around the central mounting hole to allow the solvent and inert gas to flow evenly and smoothly, improving mixing efficiency and avoiding local short-circuit flow. The static mixing component fixing plate 313 has positioning protrusions 3131 on its outer edge, which cooperate with the guide grooves 3112 on the inner wall of the cavity 311 to ensure accurate circumferential positioning, firm installation, and resistance to loosening of the static mixing component fixing plate 313, making assembly simple and positioning reliable.

[0035] like Figure 6 As shown, in one embodiment, the static mixing assembly 314 includes a central shaft 3141, static mixing blades 3142, and a mounting end plate 3143. The central shaft 3141 is a solid cylindrical rod that forms the supporting skeleton of the assembly. The static mixing blades 3142 are spirally and continuously fixed along the axial direction of the central shaft 3141. The mounting end plate 3143 is fixed to one end of the central shaft 3141, and a plurality of through holes for solvent flow are provided on the plate.

[0036] The central shaft 3141 is a solid cylindrical rod that serves as a supporting frame, ensuring the overall structural strength and coaxiality, and supporting the stable operation of the blades. The static mixing blades 3142 are continuously spirally fixed on the central shaft 3141, which cut, split, and deflect the flowing medium multiple times, enhancing the disturbance and ensuring that the solvent and inert gas are fully mixed and evenly proportioned. The mounting end plate 3143 is fixed to one end of the central shaft 3141 and is used to dock and fix with the annular lip 3111 of the cavity 311, ensuring reliable axial positioning of the component, convenient assembly, and preventing loosening.

[0037] like Figure 7 As shown, in one embodiment, the sleeve-type cooling channel 41 includes a tank body 411, two tube sheets 412, a straight pipe 413, and a cooling flange 414; The tank body 411 is a horizontal cylindrical shell, which forms the main outer shell of the cooling channel; The tube sheet 412 is horizontally fixed to the left and right ends of the tank body 411, and is a circular plate. The straight tube 413 consists of multiple parallel heat exchange tubes that vertically penetrate and are fixed between the two tube sheets 412, with both ends sealed to the tube sheets 412 respectively. The cooling flange 414 includes a front cooling flange 4141 and a rear cooling flange 4142, which are respectively sealed and fixed at the two ends of the tank body 411. The front cooling flange 4141 is provided with a process gas inlet 41411, which is connected to the gas phase outlet 31211 of the proportioning and mixing chamber 31. The rear cooling flange 4142 is provided with a process gas outlet 41421, which is connected to the inert gas storage tank 11.

[0038] The tank body 411 provides a sealed, pressure-resistant, and structurally robust heat exchange space, ensuring that the condensation process can proceed safely and stably in a sealed inert atmosphere. Two tube sheets 412 are fixed to both ends of the tank body 411, and a straight tube 413 is vertically inserted and sealed between the two tube sheets 412 to achieve reliable fixation of the heat exchange tubes and separation of the tube-side and shell-side media, ensuring heat exchange area and efficiency. The cooling flange 414 includes a front cooling flange 4141 and a rear cooling flange 4142, which are sealed and fixed at the openings at both ends of the tank body 411 to achieve sealing at both ends of the cooling channel, facilitating reliable connection with external pipelines and ensuring the overall airtightness of the system. The front cooling flange 4141 of the condensation channel is provided with a process gas inlet 41411, which is connected to the gas phase outlet of the mixing chamber, directing the mixed gas-liquid two-phase flow into the sleeve-type cooling channel to ensure controllable medium flow and sufficient heat exchange. The rear cooling flange 4142 is provided with a process gas outlet 41421, which is connected to the inert gas storage tank 11, allowing uncondensed inert gas to flow smoothly back to the storage tank, realizing closed-loop circulation of inert gas, reducing losses and saving costs.

[0039] like Figure 8 As shown, in one embodiment, the upper part of the tank body 411 is provided with a cooling medium inlet 4111, and the bottom part is provided with a condensate outlet 4112. The condensate outlet 4112 is connected to the return valve 42 through a pipeline.

[0040] A cooling medium inlet 4111 is provided at the top of the tank body 411, which can be connected to an external cooling medium supply pipeline to ensure that the cooling medium enters the shell side of the tank body stably and continuously provides cooling capacity to the process gas in the heat exchange tubes, ensuring continuous and efficient condensation heat exchange; a condensate outlet 4112 is provided at the bottom of the tank body 411, which is connected to a return valve 42 through a pipeline to allow the condensed liquid solvent to be smoothly discharged and returned to the solvent storage tank 21 through the return valve 42, realizing solvent recycling and reducing loss.

[0041] like Figure 9 As shown, in one embodiment, the inner cavity of the tube sheet 412 is fitted with an insert 4121, and the outer peripheral surface of the insert 4121 is fitted with an O-ring 41211.

[0042] An insert 4121 is installed inside the tube sheet 412 to fix the straight tube 413; an O-ring 41211 is assembled on the outer periphery of the insert to achieve radial sealing at the connection of the tube sheet 412, effectively preventing leakage of the medium between the tube side and the shell side and ensuring the system's tightness.

[0043] like Figure 10 As shown, in one embodiment, the inner wall of the straight pipe 413 is provided with a straight bar turbulence structure 4131 extending axially, and the straight bar turbulence structure 4131 includes a plurality of straight bar turbulence ribs 41311 evenly distributed along the circumferential direction.

[0044] A straight bar turbulence structure 4131 is axially integrated on the inner wall of the straight pipe 413 to disrupt the laminar flow boundary layer of the fluid, enhance the turbulent disturbance of the medium inside the pipe, improve the heat transfer intensity between the gas-liquid two-phase flow and the pipe wall, and improve the condensation efficiency. The straight bar turbulence structure 4131 is composed of multiple circumferentially distributed straight bar turbulence ribs 41311, which has a simple structure, is easy to process and form, is not easy to accumulate scale and blockage, and is stable in operation and convenient to maintain.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere, characterized in that, It includes an inert atmosphere protection module (1), a solvent supply control module (2), a gas-liquid mixing and proportioning module (3), and a condensation recovery and circulation module (4) that are connected in a closed loop according to the process flow sequence. Each module is connected to the other through a sealed pipeline to form an integrated closed loop flow channel for solvent storage, transportation, proportioning, and recovery under an inert atmosphere. The inert atmosphere protection module (1) includes an inert gas storage tank (11), which is connected to the solvent storage tank (21) and the mixing chamber (31) through branch pipelines, respectively, to introduce inert gas into the entire closed-loop system to replace the air and maintain a stable inert positive pressure atmosphere inside the system. The solvent supply control module (2) includes a solvent storage tank (21) and a flow rate control valve (22). The solvent storage tank (21) is a sealed, pressure-resistant vertical cylindrical structure used to hold volatile solvents. The flow rate control valve (22) is connected in series on the conveying pipeline between the solvent storage tank (21) and the mixing chamber (31) to regulate the solvent delivery flow rate. The gas-liquid mixing and proportioning module (3) includes a mixing chamber (31), which is used to complete the uniform mixing and proportioning of volatile solvents and inert gases, and stabilize the gas-liquid two-phase flow state. The condensation recovery circulation module (4) includes a sleeve-type cooling channel (41) and a reflux valve (42). The sleeve-type cooling channel (41) contains a cooling medium for heat exchange and condensation of the gas-liquid mixture. The reflux valve (42) is connected in series on the reflux pipeline between the reflux outlet of the mixing chamber (31), the condensate outlet of the sleeve-type cooling channel (41), and the solvent storage tank (21) to realize the closed reflux circulation of the solvent after condensation.

2. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 1, characterized in that, The solvent storage tank (21) is provided with an inert gas interface (211) at the top for communication with the inert gas storage tank (11), and a liquid phase outlet (212) at the bottom for communication with the inlet end of the flow rate set valve (22). The tank side wall is provided with a reflux interface (213) for communication with the outlet end of the reflux valve (42).

3. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 1, characterized in that, The mixing chamber (31) includes a chamber body (311), a mixing flange (312), a static mixing component fixing plate (313), and a static mixing component (314). The cavity (311) is a hollow cylindrical structure, which constitutes the main shell of the mixing cavity (31); The mixing flange (312) includes an upper mixing flange (3121) and a lower mixing flange (3122), which are symmetrically fixed at the upper and lower ends of the cavity (311). The upper mixing flange (3121) is provided with a gas phase outlet (31211), and the lower mixing flange (3122) is provided with a solvent inlet (31221). The static mixing component fixing plate (313) is horizontally snapped into the lower section inside the cavity (311); The static mixing component (314) is vertically installed above the static mixing component fixing plate (313), and its upper end is fixedly connected to the annular lip (3111) inside the cavity (311).

4. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 3, characterized in that, The inner wall of the cavity (311) is provided with a guide groove (3112) in the circumferential direction, and the static mixing component fixing plate (313) is fixed in the cavity (311) through the guide groove (3112); An inert gas inlet (3113) is provided on the upper part of the outer wall of the cavity (311).

5. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 3, characterized in that, The static mixing component fixing plate (313) is a circular plate with a central mounting hole through which the central shaft passes through the center of the plate, and multiple medium flow holes are evenly distributed around the central mounting hole; The static mixing component fixing plate (313) has multiple positioning protrusions (3131) on its outer edge, and the outer diameter of the positioning protrusions (3131) is adapted to the guide groove (3112).

6. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 3, characterized in that, The static mixing assembly (314) includes a central shaft (3141), static mixing blades (3142), and a mounting end plate (3143). The central shaft (3141) is a solid cylindrical rod that forms the supporting skeleton of the assembly. The static mixing blades (3142) are spirally and continuously fixed along the axial direction of the central shaft (3141). The mounting end plate (3143) is fixed to one end of the central shaft (3141), and a number of through holes for solvent flow are provided on the plate.

7. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 1, characterized in that, The sleeve-type cooling channel (41) includes a tank body (411), two tube sheets (412), a straight pipe (413), and a cooling flange (414). The tank body (411) is a horizontal cylindrical shell, which forms the main outer shell of the cooling channel; The tube sheet (412) is horizontally fixed to the left and right ends of the tank body (411) respectively, and is a circular plate; The straight tube (413) consists of multiple parallel heat exchange tubes that vertically penetrate and are fixed between the two tube sheets (412), with both ends sealed to the tube sheets (412); The cooling flange (414) includes a front cooling flange (4141) and a rear cooling flange (4142), which are respectively sealed and fixed at the two ends of the tank body (411); the front cooling flange (4141) is provided with a process gas inlet (41411), which is connected to the gas phase outlet (31211) of the proportioning and mixing chamber (31); the rear cooling flange (4142) is provided with a process gas outlet (41421), which is connected to the inert gas storage tank (11).

8. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 7, characterized in that, The tank body (411) has a cooling medium inlet (4111) at the top and a condensate outlet (4112) at the bottom. The condensate outlet (4112) is connected to the return valve (42) through a pipeline.

9. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 7, characterized in that, The inner cavity of the tube sheet (412) is fitted with an insert (4121), and the outer peripheral surface of the insert (4121) is fitted with an O-ring (41211).

10. The closed-loop recovery and proportioning device for volatile solvents under an inert atmosphere according to claim 7, characterized in that, The inner wall of the straight pipe (413) is provided with a straight bar turbulence structure (4131) running through it along the axial direction. The straight bar turbulence structure (4131) includes multiple straight bar turbulence ribs (41311) evenly distributed along the circumferential direction.

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