Recovery system and recovery method for residual ammonia in transportation tank

Abstract

The invention discloses a recovery system and a recovery method for residual ammonia in a transportation tank, and relates to the technical field of liquid ammonia tank overhaul, the recovery system comprises: a first treatment unit, the first treatment unit comprises a recovery tank, a first pipeline, a second pipeline and a water source; one end of the first pipeline is communicated with the recovery tank, the other end is communicated with a gas ammonia discharge valve at the bottom end of the transportation tank, one end of the second pipeline is communicated with a water source, and the other end is communicated with a liquid valve at the bottom end of the transportation tank; a first water pump is arranged on the first pipeline, a second water pump and a second treatment unit are arranged on the second pipeline, and the second treatment unit comprises an exhaust pipe, an exhaust fan and a gas treatment device which are communicated in sequence. The recovery method comprises the following steps: firstly discharging ammonia gas in the transportation tank into the recovery tank, then pumping water into the transportation tank, then pumping the formed ammonia gas into the recovery tank, and finally pumping the ammonia gas in the transportation tank into the gas treatment device through the air extractor. And residual ammonia gas in the transportation tank of the tank car can be effectively recovered.

Description

Technical Field

[0001] The invention relates to the technical field of liquid ammonia tank maintenance, and in particular to a system and method for recovering residual ammonia in a transport tank. Background Art

[0002] In the chemical industry, liquid ammonia is an important industrial raw material, widely used in fertilizer manufacturing, refrigerants, chemical synthesis and other fields. The transportation of liquid ammonia mainly relies on tank trucks (also known as tank trucks), which are dedicated pressure vessels. They have become the industry's first choice due to their high efficiency and safety. However, as pressure vessels, the transport tanks on tank trucks need to be regularly maintained and inspected to ensure their safety performance. This process includes cleaning and annual inspections. During these operations, there is always some residual ammonia in the transport tank that cannot be completely discharged. The treatment of the residual ammonia in the transport tank has become a key issue that needs to be solved urgently.

[0003] Ammonia, as a volatile and potentially harmful gas, will not only cause serious environmental pollution and increase the greenhouse effect when directly discharged into the atmosphere, but will also pose a threat to the surrounding ecology and human health. In addition, ammonia itself is a valuable chemical raw material, and its direct discharge is undoubtedly a huge waste of resources. Therefore, how to effectively recover and utilize the residual ammonia in the transport tank while ensuring the safety of personnel has become the focus of the industry.

[0004] In the prior art, for example, patent CN112879799B proposes a method for replacing ammonia during the maintenance of a liquid ammonia tank, which absorbs ammonia by injecting water into the liquid ammonia tank, and then discharges the wastewater containing ammonia into the ditch. After multiple water injections and ventilation, the ammonia concentration inside the liquid ammonia tank is finally reduced to a safe level. However, although this method solves the problem of personnel safety to a certain extent, it fails to fundamentally solve the dual challenges of environmental pollution and waste of resources. The direct discharge of wastewater may not only pollute groundwater and soil, but the ammonia contained therein cannot be effectively recovered, further exacerbating the waste of resources. Summary of the invention

[0005] The purpose of the present invention is to provide a system and method for recovering residual ammonia in a transport tank, so as to solve the problems existing in the above-mentioned prior art, effectively recover the residual ammonia in the tank truck, and avoid the negative impact of direct discharge of the residual ammonia in the tank truck on the environment.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a system for recovering residual ammonia in a transport tank, comprising:

[0008] a first processing unit, the first processing unit comprising a recovery tank, a first pipeline, a second pipeline and a water source; the recovery tank is connected to the water source through a third pipeline, one end of the first pipeline is connected to the recovery tank, and the other end is used to communicate with the gas ammonia discharge valve at the bottom of the transport tank of the liquid ammonia tank truck, one end of the second pipeline is connected to the water source, and the other end is used to communicate with the liquid valve at the bottom of the transport tank; a first water pump is provided on the first pipeline, and the first water pump is used to pump the liquid in the transport tank into the recovery tank through the first pipeline; a second water pump is provided on the second pipeline, and the second water pump is used to pump the water in the water source into the transport tank through the second pipeline;

[0009] A second processing unit, the second processing unit comprises an exhaust pipe, an exhaust fan and a gas processing device which are connected in sequence, the exhaust pipe having an end away from the exhaust fan being used to be connected to the inspection port of the transport tank; the gas processing device is an ammonia recovery device or an ammonia purification device;

[0010] A sedimentation tank, wherein the liquid inlet of the sedimentation tank is connected to a drain pipe, the end of the drain pipe away from the sedimentation tank is used to communicate with the liquid valve at the bottom end of the transport tank, the top of the sedimentation tank is connected to the recovery tank through a fourth pipeline, and a first water pump is arranged on the fourth pipeline, and the first water pump is used to pump the supernatant in the sedimentation tank into the recovery tank; a third water pump is arranged on the drain pipe.

[0011] Preferably, ultrapure water produced by an ultrapure water production device is used as the water source, and the third pipeline and the second pipeline are respectively connected to the water outlet of the ultrapure water production device.

[0012] Preferably, a distributor is fixedly provided at the bottom of the recovery tank, and the distributor is a transverse tube, and the transverse tube is provided with a plurality of discharge ports and a feed port, and the feed port is connected with the first pipeline.

[0013] Preferably, an ammonia concentration detection device is further provided in the recovery tank, and a discharge port is further provided on the recovery tank, and a discharge valve is provided at the discharge port.

[0014] Preferably, it further comprises a high-pressure flushing unit, which comprises a high-pressure flushing water pump and a high-pressure flushing pipe having one end connected to the water outlet of the high-pressure flushing water pump, and a third valve is arranged on the high-pressure flushing pipe.

[0015] Preferably, the fourth pipeline is also provided with a filter, and the filter is used to filter the supernatant.

[0016] The present invention also provides a method for recovering residual ammonia in a transport tank, based on the above-mentioned system for recovering residual ammonia in a transport tank, comprising the following steps:

[0017] (1) connecting the end of the first pipeline away from the recovery tank to the gas ammonia discharge valve at the bottom end of the transport tank, opening the gas ammonia discharge valve, and using the pressure in the transport tank to discharge part of the ammonia gas into the recovery tank through the first pipeline until the pressure in the transport tank is consistent with the atmospheric pressure, and closing the gas ammonia discharge valve to complete the initial recovery;

[0018] (2) connecting the end of the second pipeline away from the water source to the liquid valve, then opening the liquid valve and the second water pump, injecting water into the transport tank until the liquid level in the transport tank reaches half of the height of the transport tank, and then closing the liquid valve and the second water pump; after standing for 1 hour to 2 hours, the ammonia gas in the transport tank is dissolved in water to form ammonia water, disconnecting the connection between the second pipeline and the liquid valve, connecting the drain pipe to the liquid valve, and then opening the liquid valve and the third water pump, pumping all the ammonia water into the sedimentation tank through the third water pump, and then closing the liquid valve and the third water pump; after the ammonia water is allowed to stand in the sedimentation tank for 1 hour to 2 hours, opening the first water pump, pumping the supernatant in the sedimentation tank to the recovery tank through the first water pump, and then closing the first water pump;

[0019] (3) The end of the exhaust pipe away from the exhaust fan is sealedly connected to the inspection port of the transport tank, the connection between the first pipeline and the gas ammonia discharge valve is disconnected, and the gas ammonia discharge valve and the exhaust fan are opened to pump the remaining ammonia in the transport tank into the gas treatment device for treatment until the ammonia concentration in the transport tank reaches the safety standard.

[0020] Preferably, the concentration of the ammonia water in the recovery tank is detected in real time by the ammonia water concentration detection device, and after the concentration of the ammonia water in the recovery tank reaches a standard, the ammonia water in the recovery tank is discharged.

[0021] Preferably, after completing step (3), the ammonia discharge valve is closed, the connection between the inspection door and the exhaust pipe is disconnected, and the high-pressure flushing pipe is extended into the transport tank, and then the high-pressure flushing water pump and the third valve are turned on to flush the inner wall of the transport tank; at the same time, the liquid valve is opened so that the water after flushing the inner wall of the transport tank is discharged into the sedimentation tank through the drain pipe for sedimentation, and after the liquid in the sedimentation tank has settled for a set time, the supernatant in the sedimentation tank is pumped into the recovery tank by the first water pump.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] The system and method for recovering residual ammonia in a transport tank of the present invention can effectively recover residual ammonia in the transport tank of a tank truck, avoid the negative impact of direct discharge of residual ammonia in the transport tank on the environment, achieve efficient utilization of resources, and ensure the safety of operators.

[0024] Furthermore, in the initial recovery stage, the existing pressure inside the transport tank is used to automatically discharge the ammonia into the recovery tank. The ultrapure water in the recovery tank can effectively absorb the ammonia to complete the initial ammonia recovery. This design makes full use of the pressure of the transport tank itself, does not require additional power, and saves energy.

[0025] Furthermore, by injecting ultrapure water into the transport tank to increase the chance of ammonia dissolving, and then recovering the ultrapure water with dissolved ammonia to the recovery tank, this process can recover more ammonia and improve the overall recovery efficiency; it not only reduces ammonia emissions, but also realizes the recycling of resources and reduces production costs.

[0026] Furthermore, an exhaust fan is used to continuously extract the remaining ammonia in the transport tank until its concentration drops below the safety standard, ensuring the safety of subsequent operations.

[0027] Furthermore, high-pressure water is used to clean the inside of the transport tank to remove residual substances, and the waste liquid is discharged after treatment to avoid secondary pollution.

[0028] Furthermore, a filter is provided to remove impurities in the ammonia water to improve the quality of the ammonia water; an ammonia recovery device or ammonia purification device after the exhaust fan further reduces the impact of ammonia on the environment.

[0029] Furthermore, the design of the distributor in the recovery tank improves the dissolution efficiency of ammonia, making ammonia recovery more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of a system for recovering residual ammonia in a transport tank of the present invention;

[0032] In the figure: 100, a system for recovering residual ammonia in a transport tank;

[0033] 1. Transport tank; 2. Inspection port; 3. Exhaust pipe; 4. Exhaust fan; 5. Gas treatment device; 6. Third valve; 7. High-pressure flushing water pump; 8. Recovery tank; 9. Ammonia concentration detection device; 10. Distributor; 11. Liquid valve; 12. Gas ammonia discharge valve; 13. Second water pump; 14. First pipeline; 15. Second pipeline; 16. Water source; 17. Filter; 18. Liquid ammonia tank truck; 19. First water pump; 20. Fourth valve; 21. Sedimentation tank. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The purpose of the present invention is to provide a system and method for recovering residual ammonia in a transport tank, so as to solve the problems existing in the above-mentioned prior art, effectively recover the residual ammonia in the tank truck, and avoid the negative impact of direct discharge of the residual ammonia in the tank truck on the environment.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Embodiment 1

[0038] like Figure 1 As shown, this embodiment provides a system 100 for recovering residual ammonia in a transport tank, comprising:

[0039] The first processing unit includes a recovery tank 8, a first pipeline 14, a second pipeline 15 and a water source 16; the recovery tank 8 is connected to the water source 16 through a third pipeline, one end of the first pipeline 14 is connected to the recovery tank 8, and the other end is used to communicate with the gas ammonia discharge valve 12 at the bottom of the transport tank 1 of the liquid ammonia tank truck 18, one end of the second pipeline 15 is connected to the water source 16, and the other end is used to communicate with the liquid valve 11 at the bottom of the transport tank 1; a first water pump 19 is provided on the first pipeline 14, and the first water pump 19 is used to pump the liquid in the transport tank 1 into the recovery tank 8 through the first pipeline 14; a second water pump 13 is provided on the second pipeline 15, and the second water pump 13 is used to pump the water in the water source 16 into the transport tank 1 through the second pipeline 15;

[0040] The second processing unit includes an exhaust pipe 3, an exhaust fan 4 and a gas processing device 5 which are connected in sequence. The end of the exhaust pipe 3 away from the exhaust fan 4 is used to communicate with the inspection port 2 of the transport tank 1; the gas processing device 5 adopts an ammonia recovery device or an ammonia purification device;

[0041] A sedimentation tank 21, the liquid inlet of the sedimentation tank 21 is connected to a drain pipe, the end of the drain pipe away from the sedimentation tank 21 is used to communicate with the liquid valve 11 at the bottom end of the transport tank 1, the top of the sedimentation tank 21 is connected to the recovery tank 8 through a fourth pipeline, and a first water pump 19 is provided on the fourth pipeline. The first water pump 19 is used to pump the supernatant in the sedimentation tank 21 into the recovery tank; a third water pump 20 is provided on the drain pipe.

[0042] The working principle of the residual ammonia recovery system 100 in the transport tank of this embodiment is as follows:

[0043] After the first pipeline 14 is connected to the gas ammonia discharge valve 12, since there is still pressure in the transport tank 1, the residual ammonia in the transport tank 1 can be automatically discharged to the recovery tank 8 through the first pipeline 14 by utilizing the original pressure inside the transport tank 1. The water in the recovery tank 8 can effectively absorb the ammonia, completing the preliminary ammonia recovery;

[0044] Water is injected into the transport tank 1 through the second water pump 13 and the second pipeline 15, so that the residual ammonia in the transport tank 1 is fully in contact with the water, increasing the dissolution opportunity of the residual ammonia in the transport tank 1, and then the water with dissolved ammonia is recovered to the precipitation tank 21, and then recovered to the recovery tank 8 after precipitation in the precipitation tank 21. This process can recover more ammonia and improve the overall recovery efficiency; it not only reduces the emission of ammonia, but also realizes the recycling of resources and reduces the production cost;

[0045] The exhaust fan 4 is used to continuously extract the remaining ammonia in the transport tank 1 until its concentration drops below the safety standard, thereby ensuring the safety of subsequent operations; the ammonia recovery device or ammonia purification equipment after the exhaust fan 4 further reduces the impact of ammonia on the environment.

[0046] In the optional scheme of this embodiment, it is more preferred to use ultrapure water produced by an ultrapure water production device as a water source, and the third pipeline and the second pipeline are respectively connected to the water outlet of the ultrapure water production device; ultrapure water contains almost no impurities, such as minerals, organic matter, microorganisms, suspended particles, etc. This means that when dissolving ammonia, the solubility of ammonia will not be affected by other substances in the water, thereby ensuring the purity and stability of ammonia water; using ultrapure water to prepare ammonia water can obtain a higher purity product; the high purity of ultrapure water means that it has a stronger dissolving ability, especially when dissolving gases such as ammonia that are easily soluble in water, a higher solubility can be achieved. Although ammonia already has a high solubility in water, the use of ultrapure water can theoretically be closer to the theoretical maximum solubility.

[0047] In the optional scheme of this embodiment, preferably, a distributor 10 is further fixedly provided at the bottom of the recovery tank 8. Specifically, the distributor 10 is a horizontal pipe, and a plurality of discharge ports and a feed port are provided on the horizontal pipe, and the feed port is connected to the first pipeline 14. The design of the distributor 10 in the recovery tank 8 improves the dissolution efficiency of ammonia, making ammonia recovery more efficient.

[0048] In the optional scheme of this embodiment, it is more preferred that a filter 17 is further provided on the fourth pipeline, and the filter 17 is used to filter the supernatant entering the recovery tank 8 through the fourth pipeline. The filter 17 can remove impurities in the ammonia water and improve the quality of the ammonia water.

[0049] In the optional scheme of this embodiment, it is more preferred that an ammonia concentration detection device 9 is also provided in the recovery tank 8, and a discharge port is also provided on the recovery tank 8, and a discharge valve is provided at the discharge port; the ammonia concentration detection device 9 can detect the concentration of ammonia in the recovery tank 8 in real time.

[0050] In the optional scheme of this embodiment, it is more preferred to further include a high-pressure flushing unit, which includes a high-pressure flushing water pump 7 and a high-pressure flushing pipe with one end connected to the water outlet of the high-pressure flushing water pump 7, and a third valve 6 is arranged on the high-pressure flushing pipe; the inner wall of the transport storage tank can be high-pressure flushed through the high-pressure flushing pipe; the high-pressure flushing unit also includes a sedimentation tank 21, which is connected to the fourth valve 20 at the bottom end of the transport tank 1 through a drain pipe.

[0051] It is worth noting that the ammonia recovery device, ammonia purification equipment, ultrapure water production device, filter 17 and ammonia concentration detection device 9 are all commercially available products well known in the art, and their specific structures and working principles are not elaborated in this embodiment.

[0052] Embodiment 2

[0053] This embodiment provides a method for recovering residual ammonia in a transport tank, based on the system 100 for recovering residual ammonia in a transport tank of the first embodiment, comprising the following steps:

[0054] (1) connecting the end of the first pipeline 14 away from the recovery tank 8 to the gas ammonia discharge valve 12 at the bottom end of the transport tank 1, opening the gas ammonia discharge valve 12, and using the pressure in the transport tank 1 to discharge part of the ammonia gas into the recovery tank 8 through the first pipeline 14 until the pressure in the transport tank 1 is consistent with the atmospheric pressure, and then closing the gas ammonia discharge valve 12 to complete the initial recovery;

[0055] (2) Connect the end of the second pipeline 15 away from the water source 16 to the liquid valve 11 at the bottom of the transport tank 1, then open the liquid valve 11 and the second water pump 13, and inject water into the transport tank 1 until the liquid level in the transport tank 1 reaches half of the height of the transport tank 1, and then close the liquid valve 11 and the second water pump 13; after standing for 1h to 2h, the ammonia gas in the transport tank 1 is dissolved in water to form ammonia water, disconnect the connection between the second pipeline 15 and the liquid valve 11, and connect the drain pipe to the liquid valve 11, then open the liquid valve 11 and the third water pump 20, and pump all the ammonia water into the sedimentation tank 21 through the third water pump 20, and then close the liquid valve 11 and the third water pump 20; after the ammonia water is allowed to stand in the sedimentation tank 21 for 1h to 2h, open the first water pump 19, and pump the supernatant in the sedimentation tank 21 to the recovery tank 8 through the fourth pipeline through the first water pump 19, and then close the first water pump 19;

[0056] (3) The end of the exhaust pipe 3 away from the exhaust fan 4 is sealed and connected to the inspection port 2 of the transport tank 1, the connection between the first pipeline 14 and the gas ammonia discharge valve 12 is disconnected, and the gas ammonia discharge valve 12 and the exhaust fan 4 are opened to pump the remaining ammonia in the transport tank 1 into the gas treatment device 5 for treatment until the ammonia concentration in the transport tank 1 reaches the safety standard.

[0057] In the optional scheme of this embodiment, it is more preferred to detect the concentration of ammonia water in the recovery tank 8 in real time by an ammonia water concentration detection device 9, and discharge the ammonia water in the recovery tank 8 after the concentration of ammonia water in the recovery tank 8 reaches the standard.

[0058] In the optional scheme of this embodiment, it is more preferred that, after completing step (3), the gas ammonia discharge valve 12 is closed, the connection between the inspection door and the exhaust pipe 3 is disconnected, and the high-pressure flushing pipe is extended into the transport tank 1 through the inspection door, and then the high-pressure flushing water pump 7 and the third valve 6 are turned on to flush the inner wall of the transport tank 1; at the same time, the liquid valve 11 is opened, so that the water after flushing the inner wall of the transport tank 1 is discharged into the sedimentation tank 21 through the drain pipe for sedimentation, and after the liquid in the sedimentation tank 21 is precipitated for a set time, the supernatant in the sedimentation tank 21 is pumped to the recovery tank 8 by the first water pump 19; it should be noted that since some ammonia remains on the inner wall of the transport tank 1, this part of ammonia will dissolve in the flushing water, so the supernatant recovered in the sedimentation tank 21 is actually a kind of ammonia water with a lower concentration, which can be used as recovered ammonia water.

[0059] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A system for recovering residual ammonia in a transport tank, characterized in that: include: A first processing unit, the first processing unit comprising a recovery tank, a first pipeline, a second pipeline and a water source; The recovery tank is connected to the water source through a third pipeline, one end of the first pipeline is connected to the recovery tank, and the other end is used to communicate with the gas ammonia discharge valve at the bottom of the transport tank, and one end of the second pipeline is connected to the water source, and the other end is used to communicate with the liquid valve at the bottom of the transport tank; a second water pump is provided on the second pipeline, and the second water pump is used to pump water in the water source into the transport tank through the second pipeline; A second processing unit, the second processing unit comprises an exhaust pipe, an exhaust fan and a gas processing device which are connected in sequence, the exhaust pipe having an end away from the exhaust fan being used to be connected to the inspection port of the transport tank; the gas processing device is an ammonia recovery device or an ammonia purification device; A sedimentation tank, wherein the liquid inlet of the sedimentation tank is connected to a drain pipe, the end of the drain pipe away from the sedimentation tank is used to communicate with the liquid valve at the bottom end of the transport tank, the top of the sedimentation tank is connected to the recovery tank through a fourth pipeline, and a first water pump is arranged on the fourth pipeline, and the first water pump is used to pump the supernatant in the sedimentation tank into the recovery tank; a third water pump is arranged on the drain pipe.

2. The system for recovering residual ammonia in a transport tank according to claim 1, characterized in that: Ultrapure water produced by an ultrapure water production device is used as the water source, and the third pipeline and the second pipeline are respectively connected to the water outlet of the ultrapure water production device.

3. The system for recovering residual ammonia in a transport tank according to claim 1, characterized in that: A distributor is also fixedly arranged at the bottom of the recovery tank. The distributor is a transverse pipe. A plurality of discharge ports and a feed port are arranged on the transverse pipe. The feed port is communicated with the first pipeline.

4. The system for recovering residual ammonia in a transport tank according to claim 1, characterized in that: The recovery tank is also provided with an ammonia concentration detection device, and the recovery tank is also provided with a discharge port, and a discharge valve is provided at the discharge port.

5. The system for recovering residual ammonia in a transport tank according to claim 1, characterized in that: It also includes a high-pressure flushing unit, which includes a high-pressure flushing water pump and a high-pressure flushing pipe with one end connected to the water outlet of the high-pressure flushing water pump, and a third valve is arranged on the high-pressure flushing pipe.

6. The system for recovering residual ammonia in a transport tank according to claim 1, characterized in that: The fourth pipeline is also provided with a filter, and the filter is used to filter the supernatant.

7. A method for recovering residual ammonia in a transport tank, characterized in that: The system for recovering residual ammonia in a transport tank according to any one of claims 1 to 6 comprises the following steps: (1) connecting the end of the first pipeline away from the recovery tank to the gas ammonia discharge valve at the bottom end of the transport tank, opening the gas ammonia discharge valve, and using the pressure in the transport tank to discharge part of the ammonia gas into the recovery tank through the first pipeline until the pressure in the transport tank is consistent with the atmospheric pressure, and closing the gas ammonia discharge valve to complete the initial recovery; (2) connecting the end of the second pipeline away from the water source to the liquid valve, then opening the liquid valve and the second water pump, injecting water into the transport tank until the liquid level in the transport tank reaches half of the height of the transport tank, and then closing the liquid valve and the second water pump; after standing for 1 hour to 2 hours, the ammonia gas in the transport tank is dissolved in water to form ammonia water, disconnecting the connection between the second pipeline and the liquid valve, connecting the drain pipe to the liquid valve, and then opening the liquid valve and the third water pump, pumping all the ammonia water into the sedimentation tank through the third water pump, and then closing the liquid valve and the third water pump; after the ammonia water is allowed to stand in the sedimentation tank for 1 hour to 2 hours, opening the first water pump, pumping the supernatant in the sedimentation tank to the recovery tank through the first water pump, and then closing the first water pump; (3) The end of the exhaust pipe away from the exhaust fan is sealedly connected to the inspection port of the transport tank, the connection between the first pipeline and the gas ammonia discharge valve is disconnected, and the gas ammonia discharge valve and the exhaust fan are opened to pump the remaining ammonia in the transport tank into the gas treatment device for treatment until the ammonia concentration in the transport tank reaches the safety standard.

8. The method for recovering residual ammonia in a transport tank according to claim 7, characterized in that: Based on the residual ammonia recovery system in the transport tank described in claim 4, the concentration of ammonia in the recovery tank is detected in real time by the ammonia concentration detection device, and after the concentration of ammonia in the recovery tank reaches the standard, the ammonia in the recovery tank is discharged.

9. The method for recovering residual ammonia in a transport tank according to claim 7, characterized in that: Based on the residual ammonia recovery system in the transport tank described in claim 5, after completing step (3), the gas ammonia discharge valve is closed, the connection between the inspection door and the exhaust pipe is disconnected, and the high-pressure flushing pipe is extended into the transport tank, and then the high-pressure flushing water pump and the third valve are turned on to flush the inner wall of the transport tank; at the same time, the liquid valve is opened so that the water after flushing the inner wall of the transport tank is discharged into the sedimentation tank through the drain pipe for sedimentation, and after the liquid in the sedimentation tank is precipitated for a set time, the supernatant in the sedimentation tank is pumped into the recovery tank by the first water pump.

Images