A hexane gas mixing system and method

Abstract

This invention discloses a hexane gas mixing system and method, belonging to the technical field of gas mixing equipment. It includes a hexane storage tank, a vaporizer, a gas storage assembly, and a mixing interface. The hexane storage tank has a liquid pump at the bottom and a level gauge at the top. The vaporizer includes a heating tank, an immersion chamber, a spiral tube, and a heating rod. The spiral tube is coiled around the outer wall of the immersion chamber and integrally formed. The heating tank contains heating liquid, and the heating rod is located at the bottom of the heating tank. A thermometer, a pressure sensor, and a safety valve are located at the top of the immersion chamber. The gas storage assembly includes two parallel gas storage tanks. Each gas storage tank is equipped with an inlet ball valve, an outlet ball valve, and a drain recovery pipeline. The drain recovery pipeline is connected to the hexane storage tank and is equipped with an electrically controlled ball valve and a level switch. All electrical control components are electrically connected to a control terminal. This invention features high vaporization efficiency, flexible flow adjustment, and strong safety. It can recover unvaporized liquid and is suitable for hexane gas mixing needs in scenarios such as flame arrester testing.

Description

Technical Field

[0001] This invention relates to the field of gas distribution equipment technology, specifically to a hexane gas distribution system and method, which is mainly used in the flame arrester testing process to provide the flame arrester with stable and controllable hexane combustion gas. Background Technology

[0002] During the performance testing of flame arresters, hexane gas is required as the combustion medium. Therefore, a stable and reliable hexane gas mixing system is needed to vaporize the liquid hexane and mix it with air in a certain proportion to provide the required combustion gas for the flame arrester test.

[0003] Currently, most existing hexane gas distribution technologies employ simple vaporization devices to vaporize liquid hexane. These methods suffer from the following drawbacks: First, the vaporization method is singular, often involving single-stage heating and vaporization, resulting in low efficiency and difficulty in meeting rapid vaporization requirements under varying flow rates. Second, flow rate adjustment is inconvenient, failing to flexibly switch between different flame arrester testing requirements (e.g., conventional flow rates versus high-pressure testing flow rates), leading to poor adaptability. Third, safety is insufficient, lacking effective pressure and temperature monitoring and pressure relief mechanisms during vaporization, increasing the risk of explosion when pressure within the vaporization chamber is too high. Fourth, no effective liquid recovery mechanism is provided; when vaporized hexane liquefies during storage, or when incompletely vaporized liquid hexane flows into the storage tank, it cannot be recovered and reused, resulting in waste of hexane raw materials and potential safety hazards due to liquid accumulation. Fifth, some gas distribution systems require manual valve adjustment to control gas direction and flow, which is cumbersome and prone to human error.

[0004] Therefore, developing a hexane gas distribution system with high vaporization efficiency, flexible flow regulation, strong safety, and the ability to recover unvaporized liquid has become the key to overcoming the shortcomings of existing technologies. Summary of the Invention

[0005] This invention aims to solve the above-mentioned technical problems by providing a hexane gas mixing system and method. It addresses the technical issues of low vaporization efficiency, inconvenient flow rate adjustment, poor safety, inability to recover unvaporized liquid, and high risk of manual operation in the prior art, thereby achieving efficient vaporization of hexane liquid, flexible flow rate adjustment, safe and controllable operation, and the ability to recover and reuse raw materials.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] A hexane gas mixing system, characterized in that it includes a hexane storage tank, a vaporizer, a gas storage assembly, and a gas mixing interface;

[0008] The n-hexane storage tank is equipped with an inlet at the top and a pump at the bottom.

[0009] The output end of the liquid pump is connected to the liquid inlet of the vaporizer through a pipeline, and an electrically controlled ball valve and a check valve are provided between the liquid pump and the vaporizer.

[0010] The vaporizer includes a heating tank, an immersion chamber, a spiral tube, and a heating rod. The spiral tube is coiled around the outer wall of the immersion chamber and is integrally formed with the immersion chamber. The inlet of the spiral tube is connected to the output end of the liquid pump, and the outlet is connected to the inside of the immersion chamber. The heating tank stores heating liquid, and the liquid level of the heating liquid is higher than the top of the spiral tube. The heating rod is located inside the heating tank.

[0011] The outlet of the immersion chamber is connected to the gas storage assembly, and the gas storage assembly is provided with an external heat insulation device; the gas storage assembly includes a gas storage tank one and a gas storage tank two.

[0012] The outlet of the immersion chamber is connected to the inlet of gas storage tank one and the inlet of gas storage tank two respectively through branch pipes.

[0013] The outlets of gas storage tank one and gas storage tank two are combined into one through a pipeline to form a gas mixing pipeline and connected to the gas mixing interface.

[0014] The other end of the mixing port is connected to the mixing pressure tank, and an air inlet pipe for entering the mixing pressure tank is connected between the mixing pressure tank and the mixing port.

[0015] Preferably, the n-hexane storage tank is equipped with a level gauge for monitoring the inflow rate.

[0016] Preferably, the top of the immersion chamber is equipped with a thermometer, a pressure sensor, and a safety valve.

[0017] Preferred, the connection section between the branch pipeline and the first gas storage tank is equipped with an electrically controlled ball valve three, and the connection section between the branch pipeline and the second gas storage tank is equipped with an electrically controlled ball valve four, which are respectively used to control the on / off supply of vaporized n-hexane gas to the two gas storage tanks.

[0018] Preferably, an electrically controlled ball valve eight is installed at the outlet of the gas mixing pipeline connecting to the outlet of gas storage tank one, and an electrically controlled ball valve nine is installed at the outlet of gas storage tank two. Electrically controlled ball valves two and ten are respectively installed at the bottom of gas storage tank one and gas storage tank two. Electrically controlled ball valves one, two, three, four, eight, and nine, along with a heating rod, pressure sensor, thermometer, and level gauge, are all electrically connected to the control terminal. When gas liquefaction or incompletely vaporized n-hexane liquid flows into the gas storage tank, the electrically controlled ball valve two is opened, and the liquid is recovered through the drainage and recovery pipeline to the n-hexane storage tank, achieving raw material recovery and reuse while preventing liquid accumulation and potential safety hazards. The electrically controlled ball valves 1, 2, 3, 4, 8, and 9, as well as the heating rod, pressure sensor, thermometer, and level gauge, are all electrically connected to the control terminal. The control terminal enables fully automated control of the entire process, eliminating the need for manual adjustment and avoiding dangers caused by human operation.

[0019] Preferably, both the first gas storage tank and the second gas storage tank are provided with a drain port at the bottom, and the drain port is connected to the n-hexane storage tank through a drain recovery pipeline;

[0020] Preferably, the pitch of the spiral tube is 0.

[0021] Preferably, there are multiple heating rods, and the multiple heating rods are evenly distributed along the periphery of the immersion chamber.

[0022] The present invention also provides a method for preparing n-hexane gas mixture, comprising the following steps:

[0023] S1: Inject n-hexane liquid into the n-hexane storage tank, and monitor the liquid volume in the tank through the level gauge to ensure that the gas mixing requirements are met;

[0024] S2: The heating rod is activated via the control terminal to heat the heating liquid in the heating tank, and the internal temperature of the immersion chamber is monitored in real time via a thermometer;

[0025] S3: Start the pumping pump through the control terminal and open the electric ball valve one. The n-hexane liquid in the n-hexane storage tank is pumped to the spiral tube by the pumping pump. After being preheated by the heating liquid, it flows into the immersion chamber and is heated and vaporized again in the immersion chamber to form n-hexane gas.

[0026] S4: Adapt the gas supply method according to the flow rate required for the flame arrester test. When the required flow rate of the flame arrester is below 100m³ / h, open the electric ball valves three and eight, and close the electric ball valves four and nine, storing and supplying gas only through the gas storage tank one. When the required flow rate of the flame arrester is greater than 100m³ / h, open the electric ball valves four and nine, and close the electric ball valves three and eight, storing and supplying gas only through the gas storage tank two. When the required flow rate of the flame arrester is greater than 150m³ / h, simultaneously open the electric ball valves three, four, eight, and nine, storing and supplying gas simultaneously through the gas storage tank one and the gas storage tank two. The external insulation device of the gas storage component prevents the n-hexane gas from condensing and liquefying.

[0027] S5: The stored n-hexane gas is transported to the mixing interface through the mixing pipeline and mixed with the air that enters the mixing pressure tank through the air inlet pipeline. The mixing ratio of n-hexane gas and air can be adjusted by the control terminal to form a combustion mixture that meets the requirements of the flame arrester test.

[0028] S6: During the gas distribution process, the liquid level switch monitors whether there is liquefied or incompletely vaporized n-hexane liquid in gas storage tank 1 and gas storage tank 2. If so, the control terminal opens the electric ball valve 2 or electric ball valve 10 at the bottom of the corresponding gas storage tank 1 or gas storage tank 2, and recovers the liquid to the n-hexane storage tank through the liquid recovery pipeline. The control terminal monitors the liquid flow rate of the liquid recovery pipeline in real time. When the flow rate is 0, it is determined that the liquid recovery is completed and the corresponding electric ball valve 2 or electric ball valve 10 is automatically closed.

[0029] S7: Throughout the gas distribution process, the control terminal receives monitoring signals from the level gauge, thermometer, pressure sensor and level switch in real time. When the monitoring data exceeds the set range, an alarm is issued.

[0030] S8: After the gas mixing is completed, the liquid pump, heating rod and each electrically controlled ball valve are turned off in sequence through the control terminal to complete the gas mixing process.

[0031] By adopting the above method and structure, the present invention has the following advantages:

[0032] 1. High vaporization efficiency: The vaporizer of this invention adopts an integrated structure of spiral tube and immersion chamber, and the spiral tube is completely immersed in constant temperature heating liquid. The n-hexane liquid is first preheated through the spiral tube and then enters the immersion chamber for secondary heating and vaporization. The dual heating structure effectively increases the heating contact area and improves the vaporization efficiency, which can quickly meet the vaporization requirements under different flow rate requirements.

[0033] 2. Flexible flow rate adjustment: Two parallel gas storage tanks are installed, allowing for flow rate adjustment based on the flame arrester's flow rate requirements (100m³ / s). 3(Below or above / h) One of the gas storage tanks can be selectively opened, or both gas storage tanks can be opened simultaneously when testing a high-pressure flame arrester, adapting to the flow requirements of different test scenarios and offering high flexibility; at the same time, the valves can be automatically controlled through the control terminal, making flow regulation precise and convenient.

[0034] 3. High safety: A pressure sensor, thermometer and safety valve are installed at the top of the immersion chamber to monitor the temperature and pressure during the vaporization process in real time. When the pressure exceeds the limit, the safety valve will automatically release the pressure to prevent the risk of explosion. All operations are completed automatically through the control terminal without manual adjustment, avoiding safety hazards caused by human error. At the same time, a liquid level switch and liquid recovery pipeline are set up to recover unvaporized liquid in a timely manner and avoid the safety risks caused by liquid accumulation.

[0035] 4. Save raw materials: The liquefied or incompletely vaporized n-hexane liquid in the gas storage tank is recovered to the liquid storage tank through the liquid recovery pipeline, realizing the recycling and reuse of raw materials, reducing the waste of n-hexane raw materials, and lowering the gas distribution cost.

[0036] 5. Easy to operate: The entire system adopts automated control. The control terminal can realize the entire process operation such as valve opening and closing, heating temperature adjustment, and parameter monitoring without manual intervention. It is easy to operate, reduces the labor intensity of operators, and improves the stability and reliability of the gas distribution process. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Figure 2 This is the working route diagram of the present invention when only the gas storage tank is working;

[0039] Figure 3 This is the working route diagram of the present invention when only the gas storage tank 2 is working;

[0040] Figure 4 This is a working route diagram of the first and second gas storage tanks of the present invention.

[0041] As shown in the figure: 1. Hexane storage tank; 2. Pump; 3. Electrically controlled ball valve 1; 4. Check valve; 5. Heating tank; 6. Immersion chamber; 7. Spiral tube; 8. Heating rod; 9. Gas storage tank 1; 10. Gas storage tank 2; 11. Branch pipeline; 12. Gas mixing interface; 13. Electrically controlled ball valve 3; 14. Electrically controlled ball valve 4; 15. Electrically controlled ball valve 8; 16. Electrically controlled ball valve 9; 17. Mixing pressure tank; 18. Electrically controlled ball valve 2; 19. Electrically controlled ball valve 10. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the full text.

[0043] Combined with appendix Figures 1-4 A hexane gas mixing system includes a hexane storage tank 1, a vaporizer, a gas storage assembly, a gas mixing interface 12, and a control terminal. The hexane storage tank 1 is equipped with a liquid inlet and a level gauge at the top. The level gauge is used to monitor the liquid inlet and the remaining liquid in the tank in real time, so that the operator can replenish the hexane liquid in time. The bottom of the hexane storage tank 1 is equipped with a liquid pump 2. The output end of the liquid pump 2 is connected to the liquid inlet of the vaporizer through a pipeline. An electrically controlled ball valve 3 is installed on the pipeline to control the supply of hexane liquid to the vaporizer. When gas mixing is required, the liquid pump 2 is started and the electrically controlled ball valve 3 is opened by controlling the control terminal to deliver the hexane liquid to the vaporizer.

[0044] The output end of the pump 2 is connected to the inlet of the vaporizer via a pipeline. An electrically controlled ball valve 3 and a check valve 4 are installed between the pump 2 and the vaporizer. The vaporizer includes a heating tank 5, an immersion chamber 6, a spiral tube 7, and a heating rod 8. The spiral tube 7 is coiled around the outer wall of the immersion chamber 6 and integrally formed with it. The inlet of the spiral tube 7 connects to the output end of the pump 2, and the outlet connects to the interior of the immersion chamber 6. The pump 2 delivers liquid into the spiral tube 7, which then enters the immersion chamber 6 through the heated spiral tube 7. The liquid is then heated and vaporized in the immersion chamber 6 (double heating improves efficiency), and the vaporized n-hexane is discharged to the storage tank 1 or storage tank 2 through the outlet. The pitch of the spiral tube 7 is 0, which increases the heating area. The heating tank 5 contains heating liquid, and the height of the heating liquid is higher than the top of the spiral tube 7. The heating rod 8 is located inside the heating tank 5. The outlet of the immersion chamber 6 is connected to the gas storage assembly. There are multiple heating rods 8, and the multiple heating rods are evenly distributed along the periphery of the immersion chamber 6.

[0045] The gas storage assembly includes a first gas storage tank 9 and a second gas storage tank 10. The vaporizer includes a heating tank 5, an immersion chamber 6, a spiral tube 7, and a heating rod 8. The spiral tube 7 is coiled around the outer wall of the immersion chamber 6 and integrally formed with the immersion chamber 6. This structural design can effectively increase the contact area between the n-hexane liquid and the heating medium, thereby improving heating efficiency. The heating tank 5 stores heating liquid, and the height of the heating liquid is higher than the top of the spiral tube 7, ensuring that the spiral tube 7 can be completely immersed in the heating liquid, so that the n-hexane liquid in the spiral tube 7 can be heated evenly, further improving heating efficiency. The heating rod 8 is located at the bottom of the heating tank 5, and the heating rod 8 is electrically connected to the control terminal. The control terminal can adjust the heating power of the heating rod 8 to maintain the heating liquid at a set constant temperature (set according to the hexane vaporization requirements, such as 60-80℃), providing stable heat for the vaporization of hexane liquid. The top of the immersion chamber 6 is equipped with a thermometer, a pressure sensor, and a safety valve 21. The thermometer monitors the vaporization temperature inside the immersion chamber 6, and the pressure sensor monitors the vaporization pressure inside the immersion chamber 6. The thermometer and pressure sensor transmit the monitored signals to the control terminal in real time. Similarly, the liquid storage tank 1, gas storage tank 9, gas storage tank 10, and mixing pressure tank 17 are all equipped with safety valves to ensure overpressure safety. It is understood that the safety valve mentioned in the text can be a breather valve or a professional safety valve, etc., with an overpressure opening function. When the pressure inside the immersion chamber 6 exceeds a set threshold, the safety valve 21 automatically opens to release pressure, preventing the risk of explosion and ensuring a safe and stable vaporization process. The outlet of the immersion chamber 6 is connected to the gas storage component to transport the vaporized hexane gas to the gas storage component for storage.

[0046] Specifically, the gas storage assembly is equipped with an insulation device to prevent the vaporized n-hexane gas from condensing and liquefying. The insulation device can be a heat-insulating chamber, and for ease of implementation, the entire gas distribution system can be placed inside the heat-insulating chamber. Alternatively, the gas storage assembly can be wrapped with insulation cotton or similar materials. Of course, to ensure the pressure after the n-hexane vaporizes, the mixing pressure tank can also be wrapped with insulation cotton or similar materials to improve gas distribution efficiency.

[0047] The outlet of the immersion chamber 6 is connected to the inlet of gas storage tank 9 and gas storage tank 10 respectively through branch pipe 11; the outlet of gas storage tank 9 and the outlet of gas storage tank 10 are combined into one through a pipe to form a gas mixing pipe and connected to the gas mixing interface 12; the bottom of gas storage tank 9 and gas storage tank 10 are provided with a drain port, and the drain port is connected to the n-hexane storage tank 1 through a drain recovery pipe;

[0048] The gas storage assembly includes a first gas storage tank 9 and a second gas storage tank 10, which are connected in parallel to accommodate different flow rate requirements. The outlet of the immersion chamber 6 is connected to the inlet of the first gas storage tank 9 and the second gas storage tank 10 via branch pipes. An electrically controlled ball valve 3 13 is installed on the branch pipe connecting to the first gas storage tank 9, and an electrically controlled ball valve 4 14 is installed on the branch pipe connecting to the second gas storage tank 10, which respectively control the delivery of vaporized n-hexane gas to the two gas storage tanks. The outlet of the first gas storage tank 9 is connected to the mixing interface 12 via a pipe, which is equipped with an electrically controlled ball valve 8 15. The outlet of the second gas storage tank 10 is connected to the mixing interface 12 via a pipe, which is equipped with an electrically controlled ball valve 9 16, which respectively control the delivery of n-hexane gas from the two gas storage tanks to the mixing interface 12. The mixing interface 12 is connected to an external mixing system. The n-hexane gas enters the mixing system through the mixing interface 12, mixes with heated air, and provides a combustion medium for the flame arrester.

[0049] The other end of the mixing port 12 is connected to the mixing pressure tank 17, which is equipped with an air inlet pipe for entering the cavity.

[0050] The hexane storage tank 1 is equipped with a level gauge for monitoring the amount of liquid entering the tank.

[0051] The top of the immersion chamber 6 is equipped with a thermometer, a pressure sensor, and a safety valve.

[0052] The connection section between branch pipeline 11 and gas storage tank 9 is equipped with an electrically controlled ball valve 3 13, and the connection section between branch pipeline 11 and gas storage tank 10 is equipped with an electrically controlled ball valve 4 14. An electrically controlled ball valve 8 15 is installed at the outlet of the mixing pipeline and gas storage tank 9, and an electrically controlled ball valve 9 16 is installed at the outlet of gas storage tank 10. Electrically controlled ball valves 2 18 and 10 19 are respectively installed at the bottom of gas storage tank 9 and gas storage tank 10. The electrically controlled ball valves 3, 2, 3 13, 4 14, 8 15, 9 16, heating rod 8, pressure sensor, thermometer, and level gauge are all electrically connected to the control terminal. The on / off state and flow rate are controlled through the electrically controlled ball valves. By connecting to the control system, the electrically controlled ball valves can achieve remote control and automated operation.

[0053] The outlet of the mixing pressure tank 17 is equipped with a mixed gas output pipeline, and the gas storage tank 9 and the gas storage tank 10 are connected in parallel and can be used individually or simultaneously.

[0054] When the required flow rate of the flame arrester is 100m³ 3 When the gas flow rate is below 9, the gas storage tank 9 should be used alone;

[0055] When the required flow rate of the flame arrester is greater than 100m³ 3 When the gas volume is / h, gas storage tank 210 is used alone;

[0056] When the required flow rate of the flame arrester is greater than 150m 3 When the air volume is / h, gas storage tank 9 and gas storage tank 10 are used simultaneously;

[0057] Of course, the above flow rates are only test values ​​for a certain caliber of flame arrester, and the specific flow rate should be selected according to the required flow rate of different caliber flame arresters.

[0058] The present invention also provides a method for preparing n-hexane gas mixture, comprising the following steps:

[0059] S1: Inject liquid hexane into the hexane storage tank 1, and monitor the liquid volume in the tank through the liquid level gauge on the hexane storage tank 1 to ensure that the gas mixing requirements are met;

[0060] S2: The heating rod 8 in the heating tank 5 is activated by the control terminal to heat the heating liquid in the heating tank 5, and the internal temperature of the immersion chamber 6 is monitored in real time by the thermometer at the top of the immersion chamber 6.

[0061] S3: Start the pump 2 at the bottom of the n-hexane storage tank 1 through the control terminal, and open the electric ball valve 3 between the pump 2 and the vaporizer. The n-hexane liquid in the n-hexane storage tank 1 is transported to the spiral tube 7 of the vaporizer by the pump 2. After being preheated by the heating liquid in the heating tank 5, it flows into the immersion chamber 6 and is reheated and vaporized in the immersion chamber 6 to form n-hexane gas.

[0062] S4: Adapt the gas supply method according to the required flow rate for the flame arrester test. When the required flow rate for the flame arrester is below 100 m³ / h, open the electrically controlled ball valve 3 13 between branch line 11 and gas storage tank 1 9, and the electrically controlled ball valve 8 15 at the outlet of gas storage tank 1 9 in the mixing line. Close the electrically controlled ball valve 4 14 between branch line 11 and gas storage tank 2 10, and the electrically controlled ball valve 9 16 at the outlet of gas storage tank 2 10 in the mixing line. Gas storage and supply will only be through gas storage tank 1 9. When the required flow rate for the flame arrester is greater than 100 m³ / h... When the flow rate is 150 m³ / h, open the electric ball valve 4 14 and the electric ball valve 9 16, and close the electric ball valve 3 13 and the electric ball valve 8 15. Gas is stored and supplied only through the gas storage tank 2 10. When the flow rate required by the flame arrester is greater than 150 m³ / h, open the electric ball valve 3 13, the electric ball valve 4 14, the electric ball valve 8 15 and the electric ball valve 9 16 at the same time. Gas is stored and supplied simultaneously through the gas storage tank 1 9 and the gas storage tank 2 10. The heat insulation device on the outside of the gas storage components (gas storage tank 1 9 and gas storage tank 2 10) prevents the n-hexane gas from condensing and liquefying.

[0063] S5: The stored n-hexane gas is transported to the mixing port 12 through the mixing pipeline and mixed with the air that enters the mixing pressure tank 17 through the air inlet pipeline. The mixing ratio of n-hexane gas and air can be adjusted by the control terminal to form a combustion mixture that meets the requirements of the flame arrester test.

[0064] S6: During the gas distribution process, the liquid level switch monitors whether there is liquefied or incompletely vaporized n-hexane liquid in gas storage tank 19 and gas storage tank 20. If so, the control terminal opens the corresponding electric ball valve 218 at the bottom of gas storage tank 19 or the electric ball valve 1019 at the bottom of gas storage tank 20, and recovers the liquid to n-hexane storage tank 1 through the liquid recovery pipeline. The control terminal monitors the liquid flow rate of the liquid recovery pipeline in real time. When the flow rate is 0, it is determined that the liquid recovery is completed and the corresponding electric ball valve 218 or electric ball valve 1019 is automatically closed.

[0065] S7: Throughout the gas distribution process, the control terminal receives real-time monitoring signals from the level gauge (on the n-hexane storage tank 1), the thermometer (on the top of the immersion chamber 6), the pressure sensor (on the top of the immersion chamber 6), and the level switch. When the monitoring data exceeds the set range, an alarm is issued.

[0066] S8: After the gas distribution is completed, the liquid pump 2, heating rod 8 and each electrically controlled ball valve (electric ball valve 1 3, electric ball valve 2 18, electric ball valve 3 13, electric ball valve 4 14, electric ball valve 8 15, electric ball valve 9 16, electric ball valve 10 19) are closed in sequence through the control terminal to complete the gas distribution process.

[0067] Example 1:

[0068] When the required flow rate of the flame arrester is 90 m³ / h, the control terminal controls the opening of the electric ball valve 313 and the closing of the electric ball valve 414. The vaporized n-hexane gas enters the gas storage tank 19. When the pressure in the gas storage tank 19 reaches the set value (e.g., 0.01 MPa, which can be adjusted according to the test value), the control terminal controls the opening of the electric ball valve 815 and the closing of the electric ball valve 916. The n-hexane gas is then connected to the gas mixing system through the pipeline to achieve small-flow gas distribution.

[0069] Example 2:

[0070] When the required flow rate of the flame arrester is 120 m³ / h, the control terminal controls the electric ball valve 3 13 to close and the electric ball valve 4 14 to open. The vaporized n-hexane gas enters the gas storage tank 2 10. When the pressure in the gas storage tank 2 10 reaches the set value, the control terminal controls the electric ball valve 9 16 to open and the electric ball valve 8 15 to close. The n-hexane gas is then connected to the gas mixing system to achieve high-flow gas distribution.

[0071] Example 3:

[0072] When testing the high-pressure flame arrester and a larger flow rate is required, the control terminal controls the simultaneous opening of electric ball valves 13, 14, 15, and 16, and gas storage tanks 9 and 10 supply gas simultaneously. If the heating efficiency is insufficient, multiple heating devices can be connected in parallel to ensure that the gas flow rate meets the requirements.

[0073] Both gas storage tank 9 and gas storage tank 10 are equipped with drain ports at their bottoms. The drain ports are connected to the n-hexane storage tank 1 via a drain recovery pipeline. An electrically controlled ball valve 18 is installed between the drain recovery pipeline and the pipeline connecting gas storage tank 9 and gas storage tank 10. When the n-hexane gas in the gas storage tank liquefies, or when incompletely vaporized n-hexane liquid flows in, a signal is immediately sent to the control terminal. The control terminal controls the electrically controlled ball valve 18 to open, and the liquefied or unvaporized n-hexane liquid flows back to the n-hexane storage tank 1 through the drain recovery pipeline, realizing the recovery and reuse of raw materials. The control terminal controls the electrically controlled ball valve 18 to close, stopping the recovery and preventing n-hexane gas from leaking through the drain recovery pipeline.

[0074] Electric ball valves 1-3, 2-3, 3-4, 8-5, 9-16, heating rod 8, pressure sensor, thermometer, and level gauge are all electrically connected to the control terminal. The control terminal can realize fully automated control of the entire process. Operators only need to set relevant parameters (such as heating temperature, gas storage pressure, flow threshold, etc.) on the control terminal to complete the gas distribution operation without manually adjusting the valves, avoiding the danger caused by human operation, and improving the stability and accuracy of the gas distribution process.

[0075] The hexane gas mixing system of this invention features high vaporization efficiency, flexible flow rate adjustment, strong safety, and the ability to recover and reuse raw materials. It is also easy to operate and can be widely applied in scenarios requiring stable hexane gas mixing, such as flame arrester testing, overcoming many shortcomings of existing technologies.

[0076] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown throughout are only one of the embodiments of the present invention. The actual structure is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A hexane gas mixing system, characterized in that, Includes a hexane storage tank (1), a vaporizer, a gas storage assembly, and a gas mixing port (12). The n-hexane storage tank (1) is provided with an inlet at the top and a pump (2) at the bottom. The output end of the liquid pump (2) is connected to the liquid inlet of the vaporizer through a pipeline. An electric ball valve (3) and a check valve (4) are provided between the liquid pump (2) and the vaporizer. The vaporizer includes a heating tank (5), an immersion chamber (6), a spiral tube (7), and a heating rod (8). The spiral tube (7) is coiled around the outer wall of the immersion chamber (6) and is integrally formed with the immersion chamber (6). The inlet of the spiral tube (7) is connected to the output end of the pump (2), and the outlet is connected to the interior of the immersion chamber (6). The heating tank (5) contains heating liquid, and the liquid level of the heating liquid is higher than the top of the spiral tube (7). The heating rod (8) is located inside the heating tank (5). The outlet of the immersion chamber (6) is connected to the gas storage assembly, and the gas storage assembly is provided with a heat preservation device on the outside; the gas storage assembly includes a gas storage tank one (9) and a gas storage tank two (10). The outlet of the immersion chamber (6) is connected to the inlet of the first gas storage tank (9) and the inlet of the second gas storage tank (10) respectively through a branch pipe (11); The outlets of the first gas storage tank (9) and the second gas storage tank (10) are combined into one through a pipeline to form a gas mixing pipeline and connected to the gas mixing interface (12). The other end of the mixing port (12) is connected to the mixing pressure tank (17), and there is an air inlet pipe between the mixing pressure tank (17) and the mixing port (12) for entering the mixing pressure tank (17).

2. The hexane gas distribution system according to claim 1, characterized in that: The n-hexane storage tank (1) is equipped with a level gauge for monitoring the amount of liquid entering the tank.

3. The hexane gas mixing system according to claim 1, characterized in that: The top of the immersion chamber (6) is equipped with a thermometer, a pressure sensor and a safety valve.

4. The hexane gas mixing system according to claim 3, characterized in that: The connection section between the branch pipeline (11) and the first gas storage tank (9) is equipped with an electric ball valve three (13), and the connection section between the branch pipeline (11) and the second gas storage tank (10) is equipped with an electric ball valve four (14).

5. The hexane gas mixing system according to claim 4, characterized in that: The gas mixing pipeline is equipped with an electric ball valve eight (15) at the outlet of the gas storage tank one (9) and an electric ball valve nine (16) at the outlet of the gas storage tank two (10).

6. The hexane gas mixing system according to claim 5, characterized in that: The bottom of the gas storage tank 1 (9) and the gas storage tank 2 (10) are respectively equipped with an electric ball valve 2 (18) and an electric ball valve 10 (19). The electric ball valve 1 (3), electric ball valve 2 (18), electric ball valve 3 (13), electric ball valve 4 (14), electric ball valve 8 (15), electric ball valve 9 (16), heating rod (8), pressure sensor, thermometer, and level gauge are all electrically connected to the control terminal.

7. The n-hexane gas distribution system according to claim 1, characterized in that: Both the first gas storage tank (9) and the second gas storage tank (10) are equipped with a drain port at the bottom, and the drain port is connected to the n-hexane storage tank (1) through a drain recovery pipeline.

8. The hexane gas mixing system according to claim 1, characterized in that: The pitch of the spiral tube (7) is 0.

9. The n-hexane gas mixing system according to claim 1, characterized in that: The number of heating rods (8) is multiple, and the multiple heating rods are evenly distributed along the periphery of the immersion chamber (6).

10. A method for preparing n-hexane gas mixtures, characterized in that: Includes the following steps: S1: Inject hexane liquid into the hexane storage tank (1), and monitor the liquid volume in the tank through the level gauge on the hexane storage tank (1) to ensure that the gas distribution requirements are met; S2: Start the heating rod (8) in the heating tank (5) through the control terminal to heat the heating liquid in the heating tank (5), and monitor the internal temperature of the immersion chamber (6) in real time through the thermometer at the top of the immersion chamber (6); S3: Start the pump (2) at the bottom of the n-hexane storage tank (1) through the control terminal, and open the electric ball valve (3) between the pump (2) and the vaporizer. The n-hexane liquid in the n-hexane storage tank (1) is transported to the spiral tube (7) of the vaporizer by the pump (2). After being preheated by the heating liquid in the heating tank (5), it flows into the immersion chamber (6) and is heated and vaporized again in the immersion chamber (6) to form n-hexane gas. S4: Adapt the gas supply method according to the required flow rate of the flame arrester test. When the required flow rate of the flame arrester is below 100m³ / h, open the electric ball valve three (13) between the branch pipeline (11) and the gas storage tank one (9) and the electric ball valve eight (15) at the outlet of the mixing pipeline and the gas storage tank one (9), and close the electric ball valve four (14) between the branch pipeline (11) and the gas storage tank two (10) and the electric ball valve nine (16) at the outlet of the mixing pipeline and the gas storage tank two (10). Gas storage and supply are carried out only through the gas storage tank one (9). When the required flow rate of the flame arrester is below 100m³ / h, open the electric ball valve three (13) between the branch pipeline (11) and the gas storage tank one (9) and the electric ball valve nine (16) at the outlet of the mixing pipeline and the gas storage tank two (10). When the flow rate is greater than 100 m³ / h, open the electric ball valve four (14) and the electric ball valve nine (16), close the electric ball valve three (13) and the electric ball valve eight (15), and store and supply gas only through the gas storage tank two (10); when the flow rate required by the flame arrester is greater than 150 m³ / h, open the electric ball valve three (13), the electric ball valve four (14), the electric ball valve eight (15) and the electric ball valve nine (16) at the same time, and store and supply gas simultaneously through the gas storage tank one (9) and the gas storage tank two (10). The heat preservation device on the outside of the gas storage component prevents the n-hexane gas from condensing and liquefying. S5: The stored n-hexane gas is transported to the mixing port (12) through the mixing pipeline and mixed with the air that enters the mixing pressure tank (17) through the air inlet pipeline. The mixing ratio of n-hexane gas and air can be adjusted by the control terminal to form a combustion mixture that meets the requirements of the flame arrester test. S6: During the gas distribution process, the liquid level switch monitors whether there is liquefied or incompletely vaporized n-hexane liquid in gas storage tank 1 (9) and gas storage tank 2 (10). If there is, the control terminal opens the electric ball valve 2 (18) at the bottom of the corresponding gas storage tank 1 (9) or the electric ball valve 10 (19) at the bottom of the corresponding gas storage tank 2 (10) to recover the liquid to the n-hexane storage tank (1) through the liquid recovery pipeline. The control terminal monitors the liquid flow rate of the liquid recovery pipeline in real time. When the flow rate is 0, it is determined that the liquid recovery is completed and the corresponding electric ball valve 2 (18) or electric ball valve 10 (19) is automatically closed. S7: Throughout the gas distribution process, the control terminal receives monitoring signals from the level gauge, thermometer, pressure sensor and level switch in real time. When the monitoring data exceeds the set range, an alarm is issued. S8: After the gas mixing is completed, the liquid pump (2), heating rod (8) and each electrically controlled ball valve are turned off in sequence through the control terminal to complete the gas mixing process.

Images