A multi-phase state dangerous chemical leakage recovery system and a recovery method

Abstract

The application discloses a multi-phase state dangerous chemical product leakage recovery system, which comprises sequentially connected gas-liquid-solid separation module, gas-liquid separation module, gas absorption module and gas adsorption module; the gas-liquid-solid separation module comprises a gravity separator and a solid-liquid collection tank; the gas-liquid separation module comprises a gas-liquid separator and a liquid collection reaction tank; the gas absorption module comprises a Venturi scrubber and a sealed gas-liquid reaction tank; and the gas adsorption module comprises an adsorption chamber; the gas phase separated from the gravity separator and the liquid phase of the solid-liquid collection tank are transported to the gas-liquid separation module, liquid phase and part of the gas phase are absorbed in the gas-liquid separation module, the gas-liquid separator is sequentially connected to the gas absorption module and the gas adsorption module, and the gas phase is absorbed in the gas absorption module and the gas adsorption module. The application can simultaneously recover and efficiently dispose of dangerous chemical product leakage liquid, solid and gas.

Description

Technical Field

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

[0002] During the production, storage, transportation, and handling of hazardous chemicals, leaks can occur due to improper management and protection. If the leak occurs in poorly ventilated environments such as tunnels, urban pipe networks, drainage ditches, or buildings, the accumulation of hazardous chemicals can easily lead to secondary disasters such as poisoning, fires, and explosions. Therefore, hazardous chemical leaks pose a significant safety hazard. In recent years, hazardous chemical leak accidents have occurred frequently both domestically and internationally, showing an increasing trend year by year, causing significant national property losses and casualties, and posing a huge threat to social development and public safety. Moreover, hazardous chemical leaks typically involve the simultaneous presence and interaction of leaked liquids, solids, and volatile gases. Emergency response methods for single liquid, solid, or volatile gas leaks are not applicable. Therefore, this invention provides a multiphase hazardous chemical leak recovery system and method that can simultaneously and efficiently recover and dispose of leaked hazardous chemical liquids, solids, and gases. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a multiphase hazardous chemical leak recovery system and method, which can simultaneously recover and efficiently dispose of leaked hazardous chemical liquids, solids, and gases, with thorough recovery and treatment. Through the multiphase hazardous chemical leak recovery system and method provided by this invention, the hazardous chemical recovery efficiency reaches over 90%, and the disposal efficiency reaches over 70%.

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

[0005] A multiphase hazardous chemical spill recovery system includes a gas-liquid-solid separation module, a gas-liquid separation module, and a gas absorption module connected in sequence.

[0006] The gas-liquid-solid separation module includes a gravity separator and a solid-liquid collection tank. The gravity separator is provided with a gas-liquid-solid mixture inlet, a gas phase outlet, and a solid-liquid outlet. The upper middle part of the solid-liquid collection tank is provided with a first liquid phase outlet, and the bottom of the solid-liquid collection tank is provided with a first solid phase outlet. The gas-liquid-solid mixture inlet of the gravity separator draws in leaked hazardous chemicals through a suction pump. The solid-liquid outlet of the gravity separator is connected to the solid-liquid collection tank. A liquid phase layer is formed in the solid-liquid collection tank, and a solid phase layer is formed in the solid-liquid collection tank. The gas phase separated from the gas phase outlet of the gravity separator and the liquid phase in the solid-liquid collection tank are transported to the gas-liquid separation module.

[0007] The gas-liquid separation module includes a gas-liquid separator and a liquid collection reaction tank. The gas-liquid inlet of the gas-liquid separator receives the gas phase separated from the gas phase outlet of the gravity separator and the liquid phase from the solid-liquid collection tank. The liquid phase outlet of the gas-liquid separator is connected to the liquid collection reaction tank. The gas phase outlet of the gas-liquid separator is connected to a gas adsorption module. A first decontamination agent atomizing spray device is provided above the liquid collection tank. A second liquid phase outlet is provided at the bottom of the liquid collection reaction tank.

[0008] The gas absorption module includes a Venturi scrubber and a sealed gas-liquid reaction chamber. The Venturi scrubber is installed inside the sealed gas-liquid reaction chamber. The gas phase inlet of the Venturi scrubber is connected to the gas phase outlet of the gas-liquid separator through a pipeline. The sealed gas-liquid reaction chamber contains a second decontamination agent, which enters the Venturi scrubber through the liquid phase inlet. The top of the sealed gas-liquid reaction chamber has a first gas phase outlet, and the bottom of the sealed gas-liquid reaction chamber has a third liquid phase outlet.

[0009] Furthermore, the gas adsorption module includes an adsorption chamber containing an adsorbent. The adsorption chamber is connected to a first gas phase outlet at the top of a sealed gas-liquid reaction chamber via a pipeline, and a second gas phase outlet is provided at the top of the adsorption chamber.

[0010] Furthermore, two first gas phase outlets are provided, each equipped with a valve, and one of the first gas phase outlets is connected to the adsorption chamber.

[0011] Furthermore, a Venturi tube is provided between the gas-liquid-solid separation module and the gas-liquid separation module. The gas phase inlet of the Venturi tube is connected to the gas phase outlet of the gravity separator through a pipeline. The liquid phase inlet of the Venturi tube is connected to the solid-liquid collection tank through a suction hose. A float is provided at the end of the suction hose, and the float floats on the liquid phase layer of the solid-liquid collection tank.

[0012] Furthermore, the liquid collection reaction tank has two second liquid phase outlets at the bottom, one of which is connected to a circulation pump, and the other end of the circulation pump is connected to the first decontamination agent atomizing spray device.

[0013] Furthermore, the bottom of the liquid collection reaction tank is provided with packing material, which is 304 stainless steel or corrosion-resistant plastic.

[0014] Furthermore, the adsorbent is activated carbon particles, activated carbon fibers, or modified activated carbon.

[0015] Furthermore, an electrostatic eliminator is provided on one side of the gravity separator.

[0016] Furthermore, the inner and outer walls of the Venturi tube, Venturi scrubber, and gas-liquid separator are all provided with a PFA hydrophobic coating.

[0017] This invention also provides a method for recovering spilled multiphase hazardous chemicals, utilizing the aforementioned multiphase hazardous chemical spill recovery system, comprising the following steps:

[0018] (1) The leaked hazardous chemicals are drawn into the gravity separator by the suction pump, which separates the gaseous hazardous chemicals from the solid and liquid hazardous chemicals. The solid and liquid hazardous chemicals flow into the solid-liquid collection tank from the solid-liquid outlet of the gravity separator and are layered in the solid-liquid collection tank, forming a liquid phase layer on the upper layer and a solid phase layer on the lower layer. Then the gaseous hazardous chemicals separated from the gas phase outlet of the gravity separator and the liquid hazardous chemicals in the solid-liquid collection tank are transported to the gas-liquid separator in the gas-liquid separation module.

[0019] (2) The gas-liquid separator separates the gaseous hazardous chemicals and the liquid hazardous chemicals. The liquid hazardous chemicals and some of the gaseous hazardous chemicals enter the liquid collection reaction tank. The first decontamination agent atomizing spray device sprays the first decontamination agent to remove the liquid hazardous chemicals and some of the gaseous hazardous chemicals.

[0020] (3) The gaseous hazardous chemicals separated from the gas separator are removed by the gas absorption module or the gas absorption module and the gas adsorption module to obtain clean gas and discharge it.

[0021] Furthermore, the step (3) of removing the gaseous hazardous chemicals separated from the gas separator using the gas absorption module is as follows:

[0022] The gaseous hazardous chemicals separated from the gas separator enter the gas phase inlet of the Venturi scrubber in the gas absorption module through the pipeline. The liquid phase inlet of the Venturi scrubber draws in the second decontamination agent. The gaseous hazardous chemicals react with the second decontamination agent to remove the gaseous hazardous chemicals. The clean gas after the reaction is discharged from the first gas phase outlet.

[0023] Further, the step (3) of removing the gaseous hazardous chemicals separated from the gas separator through the gas absorption module and the gas adsorption module is as follows:

[0024] First, the valve of the first gas phase outlet connected to the adsorption chamber is opened, and the valve of the other first gas phase outlet is closed. The gaseous hazardous chemicals separated from the gas separator enter the gas phase inlet of the Venturi scrubber in the gas absorption module through the pipeline. The liquid phase inlet of the Venturi scrubber draws in the second decontamination agent. The gaseous hazardous chemicals react with the second decontamination agent to remove them. Then, the reacted gas enters the adsorption chamber through the pipeline from the first gas phase outlet connected to the adsorption chamber. The adsorbent in the adsorption chamber adsorbs the gaseous hazardous chemicals. After adsorption is completed, the clean gas obtained is discharged from the second gas phase outlet of the adsorption chamber.

[0025] The beneficial effects of this invention are as follows:

[0026] (1) The multiphase hazardous chemical leakage recovery system and recovery method provided by the present invention can simultaneously realize the separation, recovery and efficient disposal of leaked gas, liquid and solid hazardous chemicals, with sufficient recovery and treatment, and is applicable to the recovery of various hazardous chemical leaks.

[0027] (2) The multiphase hazardous chemical leakage recovery system and recovery method provided by the present invention can achieve a hazardous chemical recovery efficiency of over 90% and a disposal efficiency of over 70%. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the multiphase hazardous chemical leakage recovery system of Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of a multiphase hazardous chemical leakage recovery system according to Embodiment 2 of the present invention.

[0031] The diagram is labeled as follows: 1. Gas-liquid-solid separation module; 11. Gravity separator; 12. Solid-liquid collection tank; 13. First liquid phase outlet; 14. First solid phase outlet; 15. Static eliminator; 16. Suction hose; 17. Float; 2. Gas-liquid separation module; 21. Gas-liquid separator; 22. Liquid collection reaction tank; 23. First decontaminant atomizing spray device; 24. Second liquid phase outlet; 25. Circulating pump; 26. Packing material; 3. Gas absorption module; 31. Venturi scrubber; 32. Sealed gas-liquid reaction tank; 33. First gas phase outlet; 34. Third liquid phase outlet; 4. Gas adsorption module; 41. Adsorption chamber; 42. Second gas phase outlet; 5. Venturi tube. Detailed Implementation

[0032] This invention provides a multiphase hazardous chemical spill recovery system and method. 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 and not intended to limit the invention.

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0034] Example 1

[0035] Reference Figure 1 This embodiment provides a multiphase hazardous chemical leakage recovery system, including a gas-liquid-solid separation module 1, a gas-liquid separation module 2 and a gas absorption module 3 connected in sequence. The gas-liquid-solid separation module 1 and the gas-liquid separation module 2 are connected by a venturi tube 5, and the gas-liquid separation module 2 and the gas absorption module 3 are connected by a pipeline.

[0036] The gas-liquid-solid separation module 1 includes a gravity separator 11 and a solid-liquid collection tank 12. The gravity separator 11 is provided with a gas-liquid-solid mixture inlet, a gas phase outlet, and a solid-liquid outlet. The solid-liquid collection tank 12 is provided with a first liquid phase outlet 13 in the upper middle part and a first solid phase outlet 14 at the bottom. The gas-liquid-solid mixture inlet of the gravity separator 11 is used to draw in leaked hazardous chemicals through a suction pump. The solid-liquid outlet of the gravity separator 11 is connected to the solid-liquid collection tank 12. A liquid phase layer is formed in the solid-liquid collection tank 12, and a solid phase layer is formed in the upper part. The gas phase separated from the gas phase outlet of the gravity separator 11 and the liquid phase in the solid-liquid collection tank are transported to the gas-liquid separation module 2 through a venturi tube 5. In addition, an electrostatic elimination device 15 is provided on one side of the gravity separator 11. The inner and outer walls of the venturi tube 5 are provided with a PFA hydrophobic coating.

[0037] The gas-liquid separation module 2 includes a gas-liquid separator 21 and a sealed liquid collection reaction tank 22. The inner and outer walls of the gas-liquid separator 21 are coated with a PFA hydrophobic coating. The gas-liquid inlet of the gas-liquid separator 2 receives the gas phase separated from the gas phase outlet of the gravity separator 11 and the liquid phase from the solid-liquid collection tank 12 via a Venturi tube 5. The liquid phase outlet of the gas-liquid separator 21 is connected to the liquid collection reaction tank 22, and the gas phase outlet of the gas-liquid separator 21 is connected to the gas adsorption module 3. The liquid collection tank 22 contains a first decontamination agent. A first decontaminant atomizing spray device 23 is provided above the liquid collection reaction tank 22. The first decontaminant atomizing spray device 23 is specifically an atomizing nozzle. A second liquid phase outlet 24 is provided at the bottom of the liquid collection reaction tank 22. Two second liquid phase outlets 24 are provided at the bottom of the liquid collection reaction tank 22. One of the second liquid phase outlets 24 is connected to a circulation pump 25. The other end of the circulation pump 25 is connected to the first decontaminant atomizing spray device 23. The first decontaminant in the liquid collection reaction tank 22 is pumped into the first decontaminant atomizing spray device 23 through the circulation pump 25 and forms atomized droplets that are sprayed out.

[0038] The gas absorption module 3 includes a Venturi scrubber 31 and a sealed gas-liquid reaction chamber 32. The Venturi scrubber 31 is disposed inside the sealed gas-liquid reaction chamber 32, and both the inner and outer walls of the Venturi scrubber 31 are coated with a PFA hydrophobic coating. The gas phase inlet of the Venturi scrubber 31 is connected to the gas phase outlet of the gas-liquid separator 21 through a pipeline. The sealed gas-liquid reaction chamber 32 contains a second decontamination agent, which enters the Venturi scrubber 31 through the liquid phase inlet. The top of the sealed gas-liquid reaction chamber 32 is provided with a first gas phase outlet 33, and the bottom of the sealed gas-liquid reaction chamber 32 is provided with a third liquid phase outlet 34.

[0039] One end of the Venturi tube 5 between the gas-liquid-solid separation module 1 and the gas-liquid separation module 2 is provided with a gas phase inlet and a liquid phase inlet, and the other end is provided with a gas-liquid mixing outlet. The gas phase inlet of the Venturi tube 5 is connected to the gas phase outlet of the gravity separator 11 through a pipeline, and the liquid phase inlet of the Venturi tube 5 is connected to the solid-liquid collection tank 12 through a suction hose 16. The gas-liquid mixing outlet of the Venturi tube 5 is connected to the gas-liquid inlet of the gas-liquid separator 21. In addition, a float 17 is provided at the end of the suction hose 16. The float 17 floats on the liquid phase layer of the solid-liquid collection tank 12 and can drive the suction hose 17 to automatically rise and fall with the change of the liquid phase layer, thereby drawing the liquid in the liquid phase layer into the Venturi tube 5.

[0040] In addition, the bottom of the liquid collection reaction tank 22 is provided with packing material 26, which is made of 304 stainless steel or corrosion-resistant plastic.

[0041] The aforementioned multiphase hazardous chemical spill recovery system can recover and treat highly water-soluble hazardous chemical systems that have leaked onto the ground, in tunnels, urban pipe networks, drainage ditches, etc., for example, the hazardous chemical systems generated during the production of ethanol and methanol. Ethanol and methanol liquids leaked onto the ground, in tunnels, urban pipe networks, drainage ditches, etc., typically contain small solid particles or small amounts of mud, a mixture of water, methanol, and ethanol, as well as volatile vapor components. These can be efficiently absorbed using water or absorbents. The specific steps are as follows:

[0042] (1) Leaked gas-liquid-solid hazardous chemicals are drawn into gravity separator 11 by a suction pump. The suction port of gravity separator 11 is equipped with a grid with a diameter of <500μm. In gravity separator 11, gas is separated from solid and liquid. Solid and liquid hazardous chemicals flow from the solid-liquid outlet of gravity separator 11 into solid-liquid collection tank 12 and are layered in solid-liquid collection tank 12, forming a liquid phase layer on the upper layer and a solid phase layer on the lower layer. Then, the gaseous hazardous chemicals (volatile ethanol, methanol gas and air, etc.) separated from the gas phase outlet of gravity separator 11 enter venturi tube 5 and form a negative pressure in venturi tube 5. The liquid hazardous chemicals in solid-liquid collection tank 12 are drawn into venturi tube 5 under the negative pressure of venturi tube 5. After the gas and liquid are mixed in venturi tube 5, they enter the gas-liquid separator 21 in gas-liquid separation module 2 tangentially. The solids accumulated in the lower layer of solid-liquid collection tank 12 can be discharged from the first solid phase outlet 14.

[0043] (2) After the gas-liquid mixture enters the gas-liquid separator 21 tangentially, the volatile ethanol and methanol gases separate from the liquid mixture due to their different densities. The liquid mixture is drawn downwards into the liquid collection reaction tank 22 by gravity, and some volatile gases also enter the liquid collection reaction tank 22. The first decontamination agent atomizing spray device 23 sprays the first decontamination agent to carry out liquid-liquid mass transfer and gas-liquid mass transfer, removing the liquid hazardous chemicals and some volatile ethanol and methanol gases. Most of the volatile ethanol and methanol gases enter the Venturi scrubber 31 in the gas absorption module 3 through the pipeline. The Venturi scrubber 31 is a self-priming Venturi scrubber.

[0044] (3) The volatile ethanol and methanol gases that enter the Venturi scrubber 31 are sprayed out from the nozzle of the Venturi scrubber 31 and form a negative pressure inside the Venturi scrubber. The second decontaminant is drawn into the Venturi scrubber 31 from the liquid phase inlet and is atomized into droplets. Gas-liquid mass transfer is carried out to absorb the volatile ethanol and methanol gases. The clean gas after the reaction absorption is discharged from the first gas phase outlet 33 at the top of the sealed gas-liquid reaction chamber 32.

[0045] This embodiment 1 presents a multiphase hazardous chemical leak recovery system and method, applicable to most leaks of volatile liquids and gases with high mass transfer efficiency with decontamination agents. It is particularly suitable for leaks of ethanol or methanol mixtures on the ground, in urban pipe networks, and in drainage ditches, where the maximum concentration of volatile gases in the mixture is below 50% LEL, and the maximum liquid phase processing capacity is 1000 kg / h. Using this multiphase hazardous chemical leak recovery system and method, the concentration of ethanol and methanol discharged from the first gas phase outlet is below 50 ppm, far below the lower explosive limit.

[0046] Example 2

[0047] Reference Figure 2This embodiment provides a multiphase hazardous chemical leakage recovery system, including a gas-liquid-solid separation module 1, a gas-liquid separation module 2, a gas absorption module 3, and a gas adsorption module 4 connected in sequence.

[0048] The gas-liquid-solid separation module 1 includes a gravity separator 11 and a solid-liquid collection tank 12. The gravity separator 11 is provided with a gas-liquid-solid mixture inlet, a gas phase outlet, and a solid-liquid outlet. The solid-liquid collection tank 12 is provided with a first liquid phase outlet 13 in the upper middle part and a first solid phase outlet 14 at the bottom. The gas-liquid-solid mixture inlet of the gravity separator 11 is used to draw in leaked hazardous chemicals through a suction pump. The solid-liquid outlet of the gravity separator 11 is connected to the solid-liquid collection tank 12. A liquid phase layer is formed in the solid-liquid collection tank 12, and a solid phase layer is formed in the upper part. The gas phase separated from the gas phase outlet of the gravity separator 11 and the liquid phase in the solid-liquid collection tank are transported to the gas-liquid separation module 2 through a venturi tube 5. In addition, an electrostatic elimination device 15 is provided on one side of the gravity separator 11. The inner and outer walls of the venturi tube 5 are provided with a PFA hydrophobic coating.

[0049] The gas-liquid separation module 2 includes a gas-liquid separator 21 and a sealed liquid collection reaction tank 22. The gas-liquid inlet of the gas-liquid separator 2 receives the gas phase separated from the gas phase outlet of the gravity separator 11 and the liquid phase from the solid-liquid collection tank 12 through a Venturi tube 5. The liquid phase outlet of the gas-liquid separator 21 is connected to the liquid collection reaction tank 22, and the gas phase outlet of the gas-liquid separator 21 is connected to the gas adsorption module 3. The liquid collection tank 22 contains a first decontamination agent, and a first decontamination agent mist is provided above the liquid collection tank 22. The first decontamination agent atomizing spray device 23 is specifically an atomizing nozzle. The bottom of the liquid collection reaction tank 22 is provided with a second liquid phase outlet 24. There are two second liquid phase outlets 24 at the bottom of the liquid collection reaction tank 22. One of the second liquid phase outlets 24 is connected to a circulation pump 25. The other end of the circulation pump 25 is connected to the first decontamination agent atomizing spray device 23. The first decontamination agent in the liquid collection reaction tank 22 is pumped into the first decontamination agent atomizing spray device 23 through the circulation pump 25 and forms atomized droplets that are sprayed out.

[0050] The gas absorption module 3 includes a Venturi scrubber 31 and a sealed gas-liquid reaction chamber 32. The Venturi scrubber 31 is installed inside the sealed gas-liquid reaction chamber 32. The inner and outer walls of the Venturi scrubber 31 are coated with a PFA hydrophobic coating. The gas phase inlet of the Venturi scrubber 31 is connected to the gas phase outlet of the gas-liquid separator 21 through a pipeline. The sealed gas-liquid reaction chamber 32 contains a second decontamination agent, which enters the Venturi scrubber 31 through the liquid phase inlet. The top of the sealed gas-liquid reaction chamber 32 is provided with a first gas phase outlet 33. There are two first gas phase outlets 33, and each of the two first gas phase outlets 33 is equipped with a valve. One of the first gas phase outlets 33 is connected to the adsorption chamber 41 of the adsorption module 4 below through a pipeline. The bottom of the sealed gas-liquid reaction chamber 32 is also provided with a third liquid phase outlet 34.

[0051] The gas adsorption module 4 includes an adsorption chamber 41, in which an adsorbent is disposed. The adsorption chamber 41 is connected to the first gas phase outlet 33 at the top of the sealed gas-liquid reaction tank 32 via a pipeline. The top of the adsorption chamber 41 is provided with a second gas phase outlet 42.

[0052] One end of the Venturi tube 5 between the gas-liquid-solid separation module 1 and the gas-liquid separation module 2 is provided with a gas phase inlet and a liquid phase inlet, and the other end is provided with a gas-liquid mixing outlet. The gas phase inlet of the Venturi tube 5 is connected to the gas phase outlet of the gravity separator 11 through a pipeline, and the liquid phase inlet of the Venturi tube 5 is connected to the solid-liquid collection tank 12 through a suction hose 16. The gas-liquid mixing outlet of the Venturi tube 5 is connected to the gas-liquid inlet of the gas-liquid separator 21. In addition, a float 17 is provided at the end of the suction hose 16. The float 17 floats on the liquid phase layer of the solid-liquid collection tank 12 and can drive the suction hose 17 to automatically rise and fall with the change of the liquid phase layer, thereby drawing the liquid in the liquid phase layer into the Venturi tube 5.

[0053] In addition, the bottom of the liquid collection reaction tank 22 is provided with packing material 26, which is made of 304 stainless steel or corrosion-resistant plastic.

[0054] The above-mentioned multiphase hazardous chemical spill recovery system is used to recover and treat hazardous chemical systems containing liquid phases and toxic gaseous components in solid form, such as the cleanup of crude oil sludge containing H2S, where H2S gas dissolves in the sludge. The specific steps are as follows:

[0055] (1) The crude oil sludge is sucked into the gravity separator 11 by a suction pump. In the gravity separator 11, the gas is separated from the solid and liquid. The sludge flows from the solid-liquid outlet of the gravity separator 11 into the solid-liquid collection tank 12 and is layered in the solid-liquid collection tank 12, forming a liquid phase layer on the upper layer and a solid phase layer on the lower layer. Then, the H2S gas separated from the gas phase outlet of the gravity separator 11 enters the Venturi tube 5 and forms a negative pressure in the Venturi tube 5. The wastewater containing H2S in the solid-liquid collection tank 12 is sucked into the Venturi tube 5 under the negative pressure. After the gas and liquid are mixed in the Venturi tube 5, they enter the gas-liquid separator 21 in the gas-liquid separation module 2 tangentially. The solid accumulated in the lower layer of the solid-liquid collection tank 12 can be discharged from the first solid phase outlet 14.

[0056] (2) After the gas-liquid mixture enters the gas-liquid separator 21 tangentially, the H2S-containing gas and the H2S-containing wastewater are separated due to their different densities. The H2S-containing wastewater enters the packing 26 of the liquid collection reaction tank 22 by gravity, and some volatile gases also enter the liquid collection reaction tank 22. The first decontamination agent atomizing spray device 23 sprays the first decontamination agent to carry out liquid-liquid mass transfer and gas-liquid mass transfer, removing the H2S-containing wastewater and some H2S-containing gas. Most of the H2S-containing gas enters the Venturi scrubber 31 in the gas absorption module 3 through the pipeline. The Venturi scrubber 31 is a self-priming Venturi scrubber.

[0057] (3) Open the valve of the first gas phase outlet 33 connected to the adsorption chamber 41 and close the valve of the other first gas phase outlet 33. The H2S-containing gas entering the Venturi scrubber 31 is sprayed out from the nozzle of the Venturi scrubber 31 and forms a negative pressure in the Venturi scrubber. The second decontaminant is drawn into the Venturi scrubber 31 from the liquid phase inlet and is atomized into droplets. Gas-liquid mass transfer is carried out to absorb the H2S gas. After the reaction, the gas containing a small amount of H2S enters the adsorption chamber 41 from the first gas phase outlet 33 through the pipeline. The adsorbent in the adsorption chamber 41 adsorbs the H2S gas. After the adsorption is completed, the clean gas obtained is discharged from the second gas phase outlet 42 of the adsorption chamber 41.

[0058] The adsorbent in the above-mentioned adsorption chamber is zinc oxide, porous iron oxide, or alkaline activated carbon, which have a better adsorption effect on hydrogen sulfide.

[0059] This embodiment 2 presents a multiphase hazardous chemical leak recovery system and method, applicable to H2S gas with a maximum concentration of 10,000 ppm and a maximum gas flow rate of 100 Nm³. 3 The system can recover and dispose of leaked hazardous chemicals at a rate of / h. Its optimal treatment range is H2S gas concentration of 0-2000ppm. After being treated by the multiphase hazardous chemical leak recovery system of this embodiment, the H2S concentration discharged from the second gas phase outlet is <20ppm.

[0060] Example 3

[0061] This embodiment utilizes a multiphase hazardous chemical spill recovery system provided in Example 2 to clean up crude oil sludge containing H2S. The H2S gas dissolves in the sludge, and the H2S gas concentration in the mixture is 2000 ppm. In this embodiment, the first and second decontamination agents are sodium carbonate / resorcinol system decontamination agents or Fe-containing decontamination agents. 3+ / Fe 2+ V 2+ / V 3+ I 3- / I - The H2S concentration discharged from the second gas phase outlet after the decontamination agent is recovered and treated is <1ppm.

[0062] Alternatively, in this embodiment, the liquid collection reaction tank may not be filled with packing material. The first decontamination agent can directly contact the H2S-containing wastewater in the form of spray to carry out the absorption reaction. In this way, the concentration of H2S discharged from the second gas phase outlet is <1ppm.

[0063] Example 4

[0064] This embodiment utilizes a multiphase hazardous chemical leak recovery system provided in Embodiment 2 to treat leaks containing flammable and explosive gases such as C3 and C4. Taking a gas, liquid, and solid leak from an alkylation unit as an example, the leak contains sulfuric acid, hydrofluoric acid, ionic liquid, and solids produced from hydrogen chloride. The gas-liquid-solid mixture enters through the gas-liquid-solid mixture inlet of the gravity separator, with an inlet concentration of 20,000 ppm. The inlet is equipped with a solid grid with a maximum solid diameter of <500 μm. The leaked material sequentially passes through a gas-liquid-solid separation module, a gas-liquid separation module, a gas absorption module, and a gas adsorption module, and is discharged through the second gas phase outlet of the gas adsorption module with a discharge concentration of <100 ppm.

[0065] In this embodiment, the first decontamination agent is an alkaline solution, generally a 4-10% NaOH solution, the second decontamination agent is diesel oil, and the adsorbent is activated carbon or a fluidized bed.

[0066] This embodiment is applicable to alkylation process leaks on the ground, in drainage ditches, etc. The maximum concentration of volatile gases entering the system is less than 20% LEL, the maximum liquid phase processing capacity is 1000 kg / h, and the concentration of gases discharged after treatment by the system is <100 ppm.

[0067] In addition, in this embodiment, if the leaked material contains recyclable catalysts such as concentrated sulfuric acid and ionic liquids, the gas-liquid separation module may not need to add a decontamination agent and may only be used for recovery.

[0068] It should be noted that any parts not mentioned in this invention can be achieved by using or referencing existing technologies.

[0069] 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 multiphase hazardous chemical spill recovery system, characterized in that, It includes a gas-liquid-solid separation module, a gas-liquid separation module, and a gas absorption module connected in sequence; The gas-liquid-solid separation module includes a gravity separator and a solid-liquid collection tank. The gravity separator is provided with a gas-liquid-solid mixture inlet, a gas phase outlet, and a solid-liquid outlet. The upper middle part of the solid-liquid collection tank is provided with a first liquid phase outlet, and the bottom of the solid-liquid collection tank is provided with a first solid phase outlet. The gas-liquid-solid mixture inlet of the gravity separator draws in leaked hazardous chemicals through a suction pump. The solid-liquid outlet of the gravity separator is connected to the solid-liquid collection tank. A liquid phase layer is formed in the solid-liquid collection tank, and a solid phase layer is formed in the solid-liquid collection tank. The gas phase separated from the gas phase outlet of the gravity separator and the liquid phase in the solid-liquid collection tank are transported to the gas-liquid separation module. The gas-liquid separation module includes a gas-liquid separator and a liquid collection reaction tank. The gas-liquid inlet of the gas-liquid separator receives the gas phase separated from the gas phase outlet of the gravity separator and the liquid phase from the solid-liquid collection tank. The liquid phase outlet of the gas-liquid separator is connected to the liquid collection reaction tank. The gas phase outlet of the gas-liquid separator is connected to the gas absorption module. A first decontamination agent atomizing spray device is provided above the liquid collection reaction tank. A second liquid phase outlet is provided at the bottom of the liquid collection reaction tank. The gas absorption module includes a Venturi scrubber and a sealed gas-liquid reaction chamber. The Venturi scrubber is installed inside the sealed gas-liquid reaction chamber. The gas phase inlet of the Venturi scrubber is connected to the gas phase outlet of the gas-liquid separator through a pipeline. The sealed gas-liquid reaction chamber contains a second decontamination agent, which enters the Venturi scrubber through the liquid phase inlet. The top of the sealed gas-liquid reaction chamber has a first gas phase outlet, and the bottom of the sealed gas-liquid reaction chamber has a third liquid phase outlet.

2. The multiphase hazardous chemical spill recovery system according to claim 1, characterized in that, It also includes a gas adsorption module, which includes an adsorption chamber containing an adsorbent. The adsorption chamber is connected to a first gas phase outlet at the top of a sealed gas-liquid reaction chamber via a pipeline, and a second gas phase outlet is provided at the top of the adsorption chamber.

3. The multiphase hazardous chemical spill recovery system according to claim 2, characterized in that, Two first gas phase outlets are provided, and each of the two first gas phase outlets is equipped with a valve. One of the first gas phase outlets is connected to the adsorption chamber.

4. The multiphase hazardous chemical spill recovery system according to claim 1, characterized in that, A Venturi tube is provided between the gas-liquid-solid separation module and the gas-liquid separation module. The gas phase inlet of the Venturi tube is connected to the gas phase outlet of the gravity separator through a pipeline. The liquid phase inlet of the Venturi tube is connected to the solid-liquid collection tank through a suction hose. A float is provided at the end of the suction hose, and the float floats on the liquid phase layer of the solid-liquid collection tank.

5. A multiphase hazardous chemical spill recovery system according to claim 1, characterized in that, Two second liquid phase outlets are provided at the bottom of the liquid collection reaction tank. One of the second liquid phase outlets is connected to a circulation pump, and the other end of the circulation pump is connected to the first decontamination agent atomizing spray device.

6. A multiphase hazardous chemical spill recovery system according to claim 1, characterized in that, The bottom of the liquid collection reaction tank is equipped with packing material, which is made of 304 stainless steel or corrosion-resistant plastic.

7. A multiphase hazardous chemical spill recovery system according to claim 2, characterized in that, The adsorbent is activated carbon particles, activated carbon fibers, or modified activated carbon.

8. A multiphase hazardous chemical spill recovery system according to claim 1, characterized in that, An electrostatic eliminator is provided on one side of the gravity separator.

9. A multiphase hazardous chemical spill recovery system according to claim 4, characterized in that, The inner and outer walls of the Venturi tube, Venturi scrubber, and gas-liquid separator are all coated with PFA hydrophobic coating.

10. A method for recovering spilled multiphase hazardous chemicals, utilizing the multiphase hazardous chemical spill recovery system according to any one of claims 1-9, characterized in that, Includes the following steps: (1) The leaked hazardous chemicals are drawn into the gravity separator by the suction pump, which separates the gaseous hazardous chemicals from the solid and liquid hazardous chemicals. The solid and liquid hazardous chemicals flow into the solid-liquid collection tank from the solid-liquid outlet of the gravity separator and are layered in the solid-liquid collection tank, forming a liquid phase layer on the upper layer and a solid phase layer on the lower layer. Then the gaseous hazardous chemicals separated from the gas phase outlet of the gravity separator and the liquid hazardous chemicals in the solid-liquid collection tank are transported to the gas-liquid separator in the gas-liquid separation module. (2) The gas-liquid separator separates the gaseous hazardous chemicals and the liquid hazardous chemicals. The liquid hazardous chemicals and some of the gaseous hazardous chemicals enter the liquid collection reaction tank. The first decontamination agent atomizing spray device sprays the first decontamination agent to remove the liquid hazardous chemicals and some of the gaseous hazardous chemicals. (3) The gaseous hazardous chemicals separated from the gas separator are removed by the gas absorption module or the gas absorption module and the gas adsorption module to obtain clean gas and discharge it.

11. A method for recovering a multiphase hazardous chemical leak according to claim 10, characterized in that, The step (3) of removing the gaseous hazardous chemicals separated from the gas separator by the gas absorption module is as follows: The gaseous hazardous chemicals separated from the gas separator enter the gas phase inlet of the Venturi scrubber in the gas absorption module through the pipeline. The liquid phase inlet of the Venturi scrubber draws in the second decontamination agent. The gaseous hazardous chemicals react with the second decontamination agent to remove the gaseous hazardous chemicals. The clean gas after the reaction is discharged from the first gas phase outlet.

12. A method for recovering a multiphase hazardous chemical leak according to claim 10, characterized in that, The step (3) in which the gaseous hazardous chemicals separated from the gas separator are removed by the gas absorption module and the gas adsorption module is as follows: First, the valve of the first gas phase outlet connected to the adsorption chamber is opened, and the valve of the other first gas phase outlet is closed. The gaseous hazardous chemicals separated from the gas separator enter the gas phase inlet of the Venturi scrubber in the gas absorption module through the pipeline. The liquid phase inlet of the Venturi scrubber draws in the second decontamination agent. The gaseous hazardous chemicals react with the second decontamination agent to remove them. Then, the reacted gas enters the adsorption chamber through the pipeline from the first gas phase outlet connected to the adsorption chamber. The adsorbent in the adsorption chamber adsorbs the gaseous hazardous chemicals. After adsorption is completed, the clean gas obtained is discharged from the second gas phase outlet of the adsorption chamber.

Images