Leaking hazardous chemical product recovery system and recovery method

Abstract

The application discloses a leakage dangerous chemical product recovery system and recovery method, which comprises a dangerous chemical product collecting box, a Venturi generator, a suction pipe and a high-pressure inert gas cylinder. The high-pressure inert gas cylinder is connected with one end of the Venturi generator. One side of the dangerous chemical product collecting box is provided with a collecting box inlet. The top of the dangerous chemical product collecting box is provided with a collecting box outlet. The Venturi generator is communicated with the collecting box outlet on the top of the dangerous chemical product collecting box through a pipeline. The suction pipe is communicated with the collecting box inlet on one side of the dangerous chemical product collecting box. The high-pressure inert gas entering the Venturi generator can generate negative pressure to suck the leakage dangerous chemical product into the dangerous chemical product collecting box through the suction pipe. The leakage dangerous product recovery device and recovery method can return the mixed gas of the inert gas and the treated dangerous chemical product tail gas to the suction pipe, so that the gas concentration in the dangerous chemical product collecting box is kept below the lower limit of explosion, and explosion in the dangerous chemical product collecting box is prevented.

Description

Technical Field

[0001] This invention relates to the field of hazardous materials spill recovery technology, specifically to a hazardous materials spill recovery system and method. Background Technology

[0002] Currently, hazardous chemical leak recovery generally uses a transfer pump or fan as a power source to create negative pressure within the device. The leaked hazardous chemical is then drawn into the device through suction ports and other components. Gravity separation or membrane separation is then used to separate the recovered hazardous chemical into gas, liquid, and solid phases. Finally, the gas is washed, filtered, and discharged, thus achieving hazardous chemical leak recovery. For example, Chinese patent CN110872156A discloses a hazardous chemical separation and recovery method, which includes the following steps: S1, performing preliminary separation of the hazardous chemical-containing aqueous phase from the aqueous phase using gravity separation, and recovering the separated hazardous chemical; S2, further separating the hazardous chemical from the aqueous phase separated in step S1 using membrane separation and recovering it; Chinese patent CN108211526A also discloses a hazardous chemical leak emergency response system, including a separation and collection section and a gas treatment section. The gas treatment section consists of a gas treatment tank, a gas-liquid-solid three-phase separator, a collection chamber, and a gas outlet. The gas treatment section includes a treatment agent chamber, a gas decontamination chamber, a condenser, a reprocessing chamber, and a demister, all connected in sequence. The gas outlet in the separation and collection section is connected to the gas decontamination chamber in the gas treatment section, and the demister in the gas treatment section is connected to the cyclone storage chamber in the adsorption and emission section. However, for the recovery and treatment of leaked hazardous chemicals with volatile and explosive risks, the hazardous chemicals will inevitably atomize and evaporate within the device during the recovery process. If the hazardous chemical gas within the device is between its upper and lower explosive limits, it will explode upon encountering an ignition source, causing a more serious accident. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a leaked hazardous chemical recovery system and method that can keep the hazardous chemical gas inside the hazardous chemical collection box below the lower explosive limit, creating an intrinsically safe environment inside the hazardous chemical collection box and preventing explosions from occurring inside the hazardous chemical collection box.

[0004] To achieve the above objectives, the technical solution adopted by this invention is as follows:

[0005] A leaked hazardous chemical recovery system includes a hazardous chemical collection tank, a Venturi generator, and a suction pipe for drawing the hazardous chemical into the hazardous chemical collection tank. The hazardous chemical collection tank has a collection tank inlet on one side and a collection tank outlet on the top. The Venturi generator is connected to the collection tank outlet on the top of the hazardous chemical collection tank via a pipeline, and the suction pipe is connected to the collection tank inlet on one side of the hazardous chemical collection tank.

[0006] The Venturi generator includes a Venturi generator cavity, an intake pipe located on one side of the upper part of the Venturi generator cavity, and an exhaust pipe located on the other side of the upper part of the Venturi generator cavity, wherein the central axis of the intake pipe and the central axis of the exhaust pipe are on the same straight line.

[0007] The inlet end of the inlet pipe of the Venturi generator is connected to a high-pressure inert gas cylinder, and the outlet end of the inlet pipe is connected to the cavity of the Venturi generator.

[0008] The inlet end of the exhaust pipe of the Venturi generator is connected to the Venturi generator cavity, and the outlet end of the exhaust pipe includes a first exhaust outlet that is directly connected to the atmospheric environment and a second exhaust outlet that is connected to the suction pipe. The second exhaust outlet is connected to the suction pipe through a flexible hose.

[0009] As a preferred embodiment of the present invention, the hazardous chemical collection box is equipped with a VOC gas concentration detector, and the hose is equipped with a flow regulating valve.

[0010] As a preferred embodiment of the present invention, the inner diameter of the intake pipe of the venturi generator gradually decreases from the inlet end of the intake pipe to the outlet end of the intake pipe.

[0011] As a preferred embodiment of the present invention, the intake pipe of the venturi generator includes, in sequence from the inlet end to the outlet end of the intake pipe, a primary flow stabilizing section, a necking section, and a secondary flow stabilizing section. The primary and secondary flow stabilizing sections of the intake pipe are cylindrical, the necking section of the intake pipe is conical, and the ratio of the inner diameter of the secondary flow stabilizing section to the inner diameter of the primary flow stabilizing section is 0.1 to 0.5.

[0012] As a preferred embodiment of the present invention, the ratio of the inner diameter of the outlet end of the venturi generator's intake pipe to the inner diameter of the inlet end of the exhaust pipe is 0.01 to 0.97, preferably 0.1 to 0.5.

[0013] As a preferred embodiment of the present invention, the ratio of the distance L between the outlet end of the intake pipe and the inlet end of the exhaust pipe of the Venturi generator to the inner diameter D of the Venturi generator cavity is 0.11 to 0.91, preferably 0.2 to 0.7.

[0014] In the above technical solution, a large negative pressure is generated inside the Venturi generator by controlling the changes in the inner diameter of the intake pipe and exhaust pipe of the Venturi generator, as well as the distance between the outlet end of the intake pipe and the inlet end of the exhaust pipe.

[0015] As a preferred embodiment of the present invention, the inner diameter of the hose is smaller than the inner diameter of the outlet end of the exhaust pipe, and the ratio of the inner diameter of the hose to the inner diameter of the outlet end of the exhaust pipe is 0.15 to 0.87, preferably 0.2 to 0.5.

[0016] As a preferred embodiment of the present invention, the inlet of the collection box on one side of the hazardous chemical collection box is inclined downward.

[0017] As a preferred embodiment of the present invention, at least one layer of filter screen is provided inside the hazardous chemical collection box and above the inlet of the collection box.

[0018] As a preferred embodiment of the present invention, the pipeline between the Venturi generator and the hazardous chemical collection box is provided with an adsorbent material.

[0019] The present invention also provides a method for recovering leaked hazardous chemicals, which is implemented using the above-mentioned leaked hazardous chemical recovery system, and includes the following steps:

[0020] (1) Open the high-pressure inert gas cylinder to allow the high-pressure inert gas to enter the Venturi generator. The high-pressure inert gas generates negative pressure in the Venturi generator due to the change in flow rate, which draws the hazardous chemicals into the hazardous chemicals collection box.

[0021] (2) Under negative pressure, the hazardous chemical gas and / or vapor in the hazardous chemical collection box is drawn into the venturi generator cavity and mixed with the inert gas. Part of the mixed gas is discharged into the atmosphere, and the other part of the mixed gas enters the suction pipe through the hose and then enters the hazardous chemical collection box together with the hazardous chemical being drawn in, so that the concentration of hazardous chemical gas and / or vapor is lower than the lower explosive limit.

[0022] As a preferred embodiment of the present invention, in step (2), before the hazardous chemical gas and / or vapor in the hazardous chemical collection box enters the Venturi generator cavity, the filter screen at the top of the hazardous chemical collection box can filter the hazardous chemical gas and / or vapor, and the adsorption material in the pipeline between the hazardous chemical collection box and the Venturi generator can adsorb the hazardous chemical gas and / or vapor.

[0023] The beneficial effects of this invention are as follows:

[0024] (1) The present invention provides a leaked hazardous materials recovery device and recovery method, which uses high-pressure inert gas as a power source to collect hazardous chemicals, thus eliminating the safety hazards that may be caused by using electricity as a power source.

[0025] (2) The present invention provides a hazardous material recovery device and recovery method that can return the mixture of inert gas and treated hazardous chemical tail gas to the suction pipe, thereby diluting the concentration of hazardous chemical gas or vapor in the hazardous chemical collection box during the recovery process, keeping its concentration below the lower explosive limit, forming an intrinsically safe environment inside the hazardous chemical collection box, and preventing an explosion from occurring inside the hazardous chemical collection box. Attached Figure Description

[0026] To clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the leaked hazardous chemical recovery system according to Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of a Venturi generator;

[0029] Figure 3 This is a schematic diagram of the outlet end of the exhaust pipe of a venturi generator;

[0030] Figure 4 This is a schematic diagram of the structure of the hazardous chemical collection box in the leaked hazardous chemical recovery system of Embodiment 2 of the present invention;

[0031] Figure 5 This is a schematic diagram of the adsorption material installed inside the pipeline.

[0032] The diagram is labeled as follows: 1. Hazardous materials collection box; 101. Collection box inlet; 102. Collection box outlet; 2. Venturi generator; 201. Venturi generator cavity; 202. Inlet pipe; 2021. Primary flow stabilization section; 2022. Neck section; 2023. Secondary flow stabilization section; 203. Exhaust pipe; 2031. First exhaust inlet; 2032. Second exhaust outlet; 3. Suction pipe; 4. Pipeline; 5. Hose; 6. Flow regulating valve; 7. Filter screen; 8. VOC gas concentration detector; 9. Adsorption material. Detailed Implementation

[0033] This invention provides a system and method for recovering leaked hazardous chemicals. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0034] In the description of this invention, it should be understood that the terms "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0036] Example 1

[0037] Reference Figure 1 and Figure 2 This embodiment provides a leaked hazardous chemical recovery system, including a hazardous chemical collection box 1, a Venturi generator 2, a suction pipe 3, and a high-pressure inert gas cylinder (not shown in the figure). The high-pressure inert gas cylinder is connected to one end of the Venturi generator. When the high-pressure inert gas enters the Venturi generator 2, it can generate negative pressure to draw the hazardous chemical into the hazardous chemical collection box 1 through the suction pipe 3. In order to facilitate the adjustment of the inert gas pressure, a pressure regulating valve is also provided at the outlet end of the high-pressure inert gas cylinder.

[0038] Specifically, the hazardous chemical collection box 1 is a rectangular or cylindrical box, with a collection box inlet 101 on one side and a collection box outlet 102 on the top. The suction pipe 3 is connected to the collection box inlet 101 on one side of the hazardous chemical collection box 1, and the Venturi generator 2 is connected to the collection box outlet 102 on the top of the hazardous chemical collection box 1 via a pipe 4. In addition, a filter screen 7 is installed inside the hazardous chemical collection box 1 and above the collection box inlet 101.

[0039] Specifically, the Venturi generator 2 includes a Venturi generator cavity 201, an inlet pipe 202 located on one side of the upper part of the Venturi generator cavity 201, and an exhaust pipe 203 located on the other side of the upper part of the Venturi generator cavity 201. The central axis of the inlet pipe 202 and the central axis of the exhaust pipe 203 are located on the same straight line. The inlet end of the inlet pipe 202 of the Venturi generator 2 is connected to a high-pressure inert gas cylinder through a high-pressure gas pipe, and the outlet end of the inlet pipe 202 is located at the Venturi generator cavity. The inlet end of the exhaust pipe 203 of the Venturi generator 2 is located inside the Venturi generator cavity 201 and is connected to the Venturi generator cavity 201. The outlet end of the exhaust pipe 203 includes a first exhaust outlet 2031 that is directly connected to the atmospheric environment and a second exhaust outlet 2032 that is connected to the suction pipe 3. The second exhaust outlet 2032 is connected to the suction pipe 3 through a hose 5, and a flow regulating valve 6 is provided on the hose 5.

[0040] Reference Figure 3 The upper part of the outlet end of the exhaust pipe 203 of the Venturi generator cavity 201 is not blocked, forming a first exhaust outlet 2031. The lower part is blocked by a semi-circular piece, and a round hole is opened on the semi-circular piece to form a second exhaust outlet 2032. In addition, a connection interface that mates with the hose 5 is fixed on the above-mentioned round hole, so that one end of the hose 5 can be connected to the second exhaust outlet 2032 of the exhaust pipe 203.

[0041] In addition, in this embodiment, the inner diameter of the inlet pipe 202 of the Venturi generator 2 gradually decreases from the inlet end to the outlet end of the inlet pipe 202, so that the flow velocity of the high-pressure inert gas gradually increases after entering the Venturi generator 2, thereby forming a negative pressure in the area between the inlet pipe 202 and the exhaust pipe 203. The negative pressure then draws the leaked hazardous chemicals into the hazardous chemical collection box 1 through the suction pipe 3. Specifically, the inlet pipe 202 of the Venturi generator 2 includes, from the inlet end to the outlet end of the inlet pipe, a primary flow stabilizing section 2021, a necking section 2022, and a secondary flow stabilizing section 2023. The primary and secondary flow stabilizing sections of the inlet pipe are cylindrical, the necking section of the inlet pipe is conical, and the ratio of the inner diameter of the secondary flow stabilizing section to the inner diameter of the primary flow stabilizing section is 0.2.

[0042] In this embodiment, the ratio of the inner diameter of the outlet end of the intake pipe 202 of the venturi generator 2 to the inner diameter of the inlet end of the exhaust pipe 203 is 0.1.

[0043] In this embodiment, the ratio of the distance L between the outlet end of the intake pipe and the inlet end of the exhaust pipe of the Venturi generator to the inner diameter D of the Venturi generator cavity is 0.2.

[0044] In this embodiment, the inner diameter of the hose is smaller than the inner diameter of the outlet end of the exhaust pipe, and the ratio of the inner diameter of the hose to the inner diameter of the outlet end of the exhaust pipe is 0.15.

[0045] The specific process for recovering leaked hazardous chemicals using the aforementioned hazardous chemical recovery system is as follows:

[0046] (1) Open the high-pressure inert gas cylinder to allow the high-pressure inert gas to enter the Venturi generator 2. Due to the change in flow rate, the high-pressure inert gas in the Venturi generator 2 generates a negative pressure in the area between the inlet pipe 202 and the outlet pipe 203. Under the action of the negative pressure formed, the leaked hazardous chemicals are sucked into the hazardous chemical collection box 1 through the suction pipe 3 for collection.

[0047] (2) When the leaked hazardous chemicals enter the hazardous chemical collection box 1, the larger solids and liquids are stored at the bottom of the hazardous chemical collection box 1 under the action of gravity and can be stratified. The smaller solid particles and liquid droplets can move upward with the hazardous chemical gas. Under the action of the filter screen 7 above the hazardous chemical collection box, the fixed particles and liquid droplets are blocked by the filter screen 7 in the hazardous chemical collection box 1. The hazardous chemical gas and / or vapor in the hazardous chemical collection box 1 are drawn into the Venturi generator cavity 201 through the collection box outlet 102 and the pipeline 4 and mixed with the inert gas. Among them, part of the mixed gas is discharged into the atmosphere, and the other part of the mixed gas enters the suction pipe 3 through the hose 5, and then enters the hazardous chemical collection box 1 together with the drawn hazardous chemicals, so that the concentration of hazardous chemical gas and / or vapor is lower than the lower explosive limit, so that the interior of the hazardous chemical collection box forms an intrinsically safe environment and prevents an explosion from occurring in the hazardous chemical collection box.

[0048] Example 2

[0049] Reference Figure 1 and Figure 2 This embodiment provides a leaked hazardous chemical recovery system, including a hazardous chemical collection box 1, a Venturi generator 2, a suction pipe 3, and a high-pressure inert gas cylinder (not shown in the figure). The high-pressure inert gas cylinder is connected to one end of the Venturi generator. When the high-pressure inert gas enters the Venturi generator 2, it can generate negative pressure to draw the hazardous chemical into the hazardous chemical collection box 1 through the suction pipe 3. In order to facilitate the adjustment of the inert gas pressure, a pressure regulating valve is also provided at the outlet end of the high-pressure inert gas cylinder.

[0050] Specifically, refer to Figure 4 The hazardous chemical collection box 1 is a rectangular or cylindrical box, and a downwardly oriented collection box inlet 101 is provided on one side of the hazardous chemical collection box 1. The collection box inlet 101 is tubular, and a collection box outlet 102 is provided on the top of the hazardous chemical collection box 1. The suction pipe 3 is connected to the collection box inlet 101 on one side of the hazardous chemical collection box 1, and the Venturi generator 2 is connected to the collection box outlet 102 on the top of the hazardous chemical collection box 1 through a pipe 4. In addition, a filter screen 7 is provided inside the hazardous chemical collection box 1 and above the collection box inlet 101.

[0051] Specifically, the Venturi generator 2 includes a Venturi generator cavity 201, an inlet pipe 202 located on one side of the upper part of the Venturi generator cavity 201, and an exhaust pipe 203 located on the other side of the upper part of the Venturi generator cavity 201. The central axis of the inlet pipe 202 and the central axis of the exhaust pipe 203 are located on the same straight line. The inlet end of the inlet pipe 202 of the Venturi generator 2 is connected to a high-pressure inert gas cylinder through a high-pressure gas pipe, and the outlet end of the inlet pipe 202 is located at the Venturi generator cavity. The inlet end of the exhaust pipe 203 of the Venturi generator 2 is located inside the Venturi generator cavity 201 and is connected to the Venturi generator cavity 201. The outlet end of the exhaust pipe 203 includes a first exhaust outlet 2031 that is directly connected to the atmospheric environment and a second exhaust outlet 2032 that is connected to the suction pipe 3. The second exhaust outlet 2032 is connected to the suction pipe 3 through a hose 5, and a flow regulating valve 6 is provided on the hose 5.

[0052] Reference Figure 3 The upper part of the outlet end of the exhaust pipe 203 of the Venturi generator cavity 201 is not blocked, forming a first exhaust outlet 2031. The lower part is blocked by a semi-circular piece, and a round hole is opened on the semi-circular piece to form a second exhaust outlet 2032. In addition, a connection interface that mates with the hose 5 is fixed on the above-mentioned round hole, so that one end of the hose 5 can be connected to the second exhaust outlet 2032 of the exhaust pipe 203.

[0053] In addition, in this embodiment, the inner diameter of the inlet pipe 202 of the Venturi generator 2 gradually decreases from the inlet end to the outlet end of the inlet pipe 202, thereby increasing the flow velocity of the high-pressure inert gas after it enters the Venturi generator 2. This creates a negative pressure in the area between the inlet pipe 202 and the exhaust pipe 203, which then draws the leaked hazardous chemicals into the hazardous chemical collection box 1 through the suction pipe 3. Specifically, the inlet pipe 202 of the Venturi generator 2 includes, from the inlet end to the outlet end, a primary flow stabilizing section 2021, a constricted section 2022, and a secondary flow stabilizing section 2023. The primary and secondary flow stabilizing sections of the inlet pipe are cylindrical, the constricted section is conical, and the ratio of the inner diameter of the secondary flow stabilizing section to the primary flow stabilizing section is 0.3.

[0054] In this embodiment, the ratio of the inner diameter of the outlet end of the intake pipe 202 of the venturi generator 2 to the inner diameter of the inlet end of the exhaust pipe 203 is 0.5.

[0055] In this embodiment, the ratio of the distance L between the outlet end of the intake pipe and the inlet end of the exhaust pipe of the Venturi generator to the inner diameter D of the Venturi generator cavity is 0.7.

[0056] In this embodiment, the inner diameter of the hose is smaller than the inner diameter of the outlet end of the exhaust pipe, and the ratio of the inner diameter of the hose to the inner diameter of the outlet end of the exhaust pipe is 0.5.

[0057] The specific process for recovering leaked hazardous chemicals using the aforementioned hazardous chemical recovery system is as follows:

[0058] (1) Open the high-pressure inert gas cylinder to allow the high-pressure inert gas to enter the Venturi generator 2. Due to the change in flow rate, the high-pressure inert gas in the Venturi generator 2 generates a negative pressure in the area between the inlet pipe 202 and the outlet pipe 203. Under the action of the negative pressure formed, the leaked hazardous chemicals are sucked into the hazardous chemical collection box 1 through the suction pipe 3 for collection.

[0059] (2) When the leaked hazardous chemicals enter the hazardous chemical collection box 1, the larger solids and liquids are stored at the bottom of the hazardous chemical collection box 1 under the action of gravity and can be stratified. The smaller solid particles and liquid droplets can move upward with the hazardous chemical gas. Under the action of the filter screen 7 above the hazardous chemical collection box, the fixed particles and liquid droplets are blocked by the filter screen 7 in the hazardous chemical collection box 1. The hazardous chemical gas and / or vapor in the hazardous chemical collection box 1 are drawn into the Venturi generator cavity 201 through the collection box outlet 102 and the pipeline 4 and mixed with the inert gas. Among them, part of the mixed gas is discharged into the atmosphere, and the other part of the mixed gas enters the suction pipe 3 through the hose 5, and then enters the hazardous chemical collection box 1 together with the drawn hazardous chemicals, so that the concentration of hazardous chemical gas and / or vapor is lower than the lower explosive limit, so that the interior of the hazardous chemical collection box forms an intrinsically safe environment and prevents an explosion from occurring in the hazardous chemical collection box.

[0060] In addition, in step (2) above, since the inlet 101 of the hazardous chemical collection box 1 is inclined downward, when the leaked hazardous chemical is sucked into the hazardous chemical collection box 1 from the suction pipe, the leaked hazardous chemical enters the hazardous chemical collection box 1 downward along the inner wall of the inlet. During the rotation and descent process, the leaked hazardous chemical achieves the separation of the gas phase and the liquid and solid phases, thereby reducing the smaller solid particles and liquid droplets mixed in the gas phase, reducing the working pressure of the filter screen, and also reducing the formation of liquid droplets, thereby reducing the concentration of liquid vapor and achieving a safer hazardous chemical leakage recovery process.

[0061] Example 3

[0062] Reference Figure 1 and Figure 2This embodiment provides a leaked hazardous chemical recovery system, including a hazardous chemical collection box 1, a venturi generator 2, a suction pipe 3, and a high-pressure inert gas cylinder (not shown in the figure). The high-pressure inert gas cylinder is connected to one end of the venturi generator. When the high-pressure inert gas enters the venturi generator 2, it can generate negative pressure to draw the hazardous chemical into the hazardous chemical collection box 1 through the suction pipe 3.

[0063] Specifically, the hazardous chemical collection box 1 is a rectangular or cylindrical box, with a collection box inlet 101 on one side and a collection box outlet 102 on the top. The suction pipe 3 is connected to the collection box inlet 101 on one side of the hazardous chemical collection box 1, and the Venturi generator 2 is connected to the collection box outlet 102 on the top of the hazardous chemical collection box 1 via a pipe 4. In addition, a filter screen 7 is installed inside the hazardous chemical collection box 1 and above the collection box inlet 101, and a VOC gas concentration detector 8 is installed inside the hazardous chemical collection box and above the filter screen 7.

[0064] Specifically, the Venturi generator 2 includes a Venturi generator cavity 201, an inlet pipe 202 located on one side of the upper part of the Venturi generator cavity 201, and an exhaust pipe 203 located on the other side of the upper part of the Venturi generator cavity 201. The central axis of the inlet pipe 202 and the central axis of the exhaust pipe 203 are located on the same straight line. The inlet end of the inlet pipe 202 of the Venturi generator 2 is connected to a high-pressure inert gas cylinder through a high-pressure gas pipe, and the outlet end of the inlet pipe 202 is located at the Venturi generator cavity. The inlet end of the exhaust pipe 203 of the Venturi generator 2 is located inside the Venturi generator cavity 201 and is connected to the Venturi generator cavity 201. The outlet end of the exhaust pipe 203 includes a first exhaust outlet 2031 that is directly connected to the atmospheric environment and a second exhaust outlet 2032 that is connected to the suction pipe 3. The second exhaust outlet 2032 is connected to the suction pipe 3 through a hose 5, and a flow regulating valve 6 is provided on the hose 5.

[0065] Reference Figure 3 The upper part of the outlet end of the exhaust pipe 203 of the Venturi generator cavity 201 is not blocked, forming a first exhaust outlet 2031. The lower part is blocked by a semi-circular piece, and a round hole is opened on the semi-circular piece to form a second exhaust outlet 2032. In addition, a connection interface that mates with the hose 5 is fixed on the above-mentioned round hole, so that one end of the hose 5 can be connected to the second exhaust outlet 2032 of the exhaust pipe 203.

[0066] In addition, in this embodiment, the inner diameter of the inlet pipe 202 of the Venturi generator 2 gradually decreases from the inlet end to the outlet end of the inlet pipe 202, thereby causing the flow velocity of the high-pressure inert gas to gradually increase after entering the Venturi generator 2. This creates a negative pressure in the area between the inlet pipe 202 and the exhaust pipe 203, and the resulting negative pressure draws the leaked hazardous chemicals into the hazardous chemical collection box 1 through the suction pipe 3. Specifically, the inlet pipe 202 of the Venturi generator 2 includes, from the inlet end to the outlet end, a primary flow stabilizing section 2021, a constricted section 2022, and a secondary flow stabilizing section 2023. The primary and secondary flow stabilizing sections of the inlet pipe are cylindrical, the constricted section is conical, and the ratio of the inner diameter of the secondary flow stabilizing section to the inner diameter of the primary flow stabilizing section is 0.2.

[0067] In this embodiment, the ratio of the inner diameter of the outlet end of the intake pipe 202 of the venturi generator 2 to the inner diameter of the inlet end of the exhaust pipe 203 is 0.97.

[0068] In this embodiment, the ratio of the distance L between the outlet end of the intake pipe and the inlet end of the exhaust pipe of the Venturi generator to the inner diameter D of the Venturi generator cavity is 0.91.

[0069] In this embodiment, the inner diameter of the hose is smaller than the inner diameter of the outlet end of the exhaust pipe, and the ratio of the inner diameter of the hose to the inner diameter of the outlet end of the exhaust pipe is 0.87.

[0070] Reference Figure 5 In this embodiment, an adsorbent material 9 is provided inside the pipeline 4 between the Venturi generator 2 and the hazardous chemical collection box 1, and the pipeline 4 is a multi-section bend-shaped pipeline, with the adsorbent material provided in the vertical section of the pipeline 4 near the top of the hazardous chemical collection box.

[0071] The aforementioned adsorbent material 9 can specifically be honeycomb activated carbon.

[0072] The specific process for recovering leaked hazardous chemicals using the aforementioned hazardous chemical recovery system is as follows:

[0073] (1) Open the high-pressure inert gas cylinder to allow the high-pressure inert gas to enter the Venturi generator 2. Due to the change in flow rate, the high-pressure inert gas in the Venturi generator 2 generates a negative pressure in the area between the inlet pipe 202 and the outlet pipe 203. Under the action of the negative pressure formed, the leaked hazardous chemicals are sucked into the hazardous chemical collection box 1 through the suction pipe 3 for collection.

[0074] (2) When the leaked hazardous chemicals enter the hazardous chemical collection box 1, the larger solids and liquids are stored at the bottom of the hazardous chemical collection box 1 under the action of gravity and can be stratified. The smaller solid particles and liquid droplets can move upward with the hazardous chemical gas. Under the action of the filter screen 7 above the hazardous chemical collection box, the fixed particles and liquid droplets are blocked by the filter screen 7 in the hazardous chemical collection box 1. The hazardous chemical gas and / or vapor in the hazardous chemical collection box 1 are drawn into the Venturi generator cavity 201 through the collection box outlet 102 and the pipeline 4 and mixed with the inert gas. Among them, part of the mixed gas is discharged into the atmosphere, and the other part of the mixed gas enters the suction pipe 3 through the hose 5, and then enters the hazardous chemical collection box 1 together with the drawn hazardous chemicals, so that the concentration of hazardous chemical gas and / or vapor is lower than the lower explosive limit, so that the interior of the hazardous chemical collection box forms an intrinsically safe environment and prevents an explosion from occurring in the hazardous chemical collection box.

[0075] In addition, in step (2) above, when the hazardous chemical gas and / or vapor in the hazardous chemical collection box 1 enters the pipeline 4 through the collection box outlet 102, the adsorption material in the pipeline 4 can adsorb the toxic gas (VOC gas) in the hazardous chemical gas and / or vapor, thereby reducing environmental pollution and also reducing the proportion of hazardous chemical gas and / or vapor in the mixed gas entering the suction pipe, thereby better maintaining the concentration of gas and / or vapor in the hazardous chemical collection box.

[0076] In addition, during the recovery of leaked hazardous chemicals using the above-mentioned hazardous chemical recovery system, a VOC gas concentration detector 8 can be used to detect the gas concentration in the hazardous chemical collection tank 1. Based on the volatile gas concentration detected by the VOC gas concentration detector, the flow rate of the mixture of inert gas and treated hazardous chemical tail gas returned to the suction pipe is adjusted by the flow regulating valve 6 on the hose 5, so as to ensure that the concentration of hazardous chemical gas and / or vapor in the hazardous chemical collection tank 1 is lower than the lower explosive limit.

[0077] It should be noted that any parts not mentioned in this invention can be achieved by using or referencing existing technologies.

[0078] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A system for recovering leaked hazardous chemicals, characterized in that, The device includes a hazardous chemical collection box, a venturi generator, and a suction pipe. The hazardous chemical collection box has a collection box inlet on one side and a collection box outlet on the top. The venturi generator is connected to the collection box outlet on the top of the hazardous chemical collection box via a pipeline, and the suction pipe is connected to the collection box inlet on one side of the hazardous chemical collection box. The Venturi generator includes a Venturi generator cavity, an intake pipe located on one side of the upper part of the Venturi generator cavity, and an exhaust pipe located on the other side of the upper part of the Venturi generator cavity, wherein the central axis of the intake pipe and the central axis of the exhaust pipe are on the same straight line. The inlet end of the inlet pipe of the Venturi generator is connected to a high-pressure inert gas cylinder, and the outlet end of the inlet pipe is connected to the cavity of the Venturi generator. The inlet end of the exhaust pipe of the Venturi generator is connected to the Venturi generator cavity, and the outlet end of the exhaust pipe includes a first exhaust outlet that is directly connected to the atmospheric environment and a second exhaust outlet that is connected to the suction pipe. The second exhaust outlet is connected to the suction pipe through a flexible hose.

2. The hazardous chemical spill recovery system according to claim 1, characterized in that, The hazardous chemical collection box is equipped with a VOC gas concentration detector, and the hose is equipped with a flow regulating valve.

3. The hazardous chemical spill recovery system according to claim 1, characterized in that, The inner diameter of the intake pipe of the Venturi generator gradually decreases from the inlet end to the outlet end of the intake pipe.

4. A leaked hazardous chemical recovery system according to claim 3, characterized in that, The venturi generator's intake pipe includes, from its inlet end to its outlet end, a primary flow stabilizing section, a necking section, and a secondary flow stabilizing section. The primary and secondary flow stabilizing sections are cylindrical, the necking section is conical, and the ratio of the inner diameter of the secondary flow stabilizing section to the inner diameter of the primary flow stabilizing section is 0.1 to 0.

5.

5. A leaked hazardous chemical recovery system according to claim 4, characterized in that, The ratio of the inner diameter of the outlet end of the intake pipe of the Venturi generator to the inner diameter of the inlet end of the exhaust pipe is 0.01 to 0.

97.

6. A leaked hazardous chemical recovery system according to claim 1, characterized in that, The ratio of the distance L between the outlet end of the intake pipe and the inlet end of the exhaust pipe of the Venturi generator to the inner diameter D of the Venturi generator cavity is 0.11~0.

91.

7. A leaked hazardous chemical recovery system according to claim 1, characterized in that, The inner diameter of the hose is smaller than the inner diameter of the outlet end of the exhaust pipe, and the ratio of the inner diameter of the hose to the inner diameter of the outlet end of the exhaust pipe is 0.15 to 0.

87.

8. A leaked hazardous chemical recovery system according to claim 1, characterized in that, The inlet of the hazardous chemical collection box is tilted downwards on one side.

9. A hazardous chemical spill recovery system according to claim 1, characterized in that, At least one layer of filter screen is installed inside the hazardous chemical collection box and above the inlet of the collection box.

10. A leaked hazardous chemical recovery system according to claim 1, characterized in that, The pipeline between the Venturi generator and the hazardous chemical collection box is equipped with an adsorbent material.

11. A method for recovering leaked hazardous chemicals, utilizing a leaked hazardous chemical recovery system according to any one of claims 1-10, characterized in that, Includes the following steps: (1) Open the high-pressure inert gas cylinder to allow the high-pressure inert gas to enter the Venturi generator. The high-pressure inert gas generates negative pressure in the Venturi generator due to the change in flow rate, which draws the hazardous chemicals into the hazardous chemical collection box. (2) Under negative pressure, the hazardous chemical gas and / or vapor in the hazardous chemical collection box is drawn into the venturi generator cavity and mixed with the inert gas. Part of the mixed gas is discharged into the atmosphere, and the other part of the mixed gas enters the suction pipe through the hose and then enters the hazardous chemical collection box together with the hazardous chemical being drawn in, so that the concentration of hazardous chemical gas and / or vapor is lower than the lower explosive limit.

12. A method for recovering leaked hazardous chemicals according to claim 11, characterized in that, In step (2), before the hazardous chemical gas and / or vapor in the hazardous chemical collection box enter the Venturi generator cavity, the filter screen on the top of the hazardous chemical collection box can filter the hazardous chemical gas and / or vapor, and the adsorption material in the pipeline between the hazardous chemical collection box and the Venturi generator can adsorb the hazardous chemical gas and / or vapor.

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