Automatic leak detection device for high-pressure equipment in carbon dioxide steam stripping urea process

Abstract

The utility model relates to the technical field of leak detection of high-pressure equipment, in particular to an automatic leak detection device for high-pressure equipment in a carbon dioxide stripping urea process, which comprises a nitrogen storage tank and a high-pressure jacket container, the high-pressure jacket container comprises an upper seal head, a lower seal head and a cylinder, and jackets are arranged on the outer surfaces of the upper seal head, the lower seal head and the cylinder. A first nitrogen pipeline is communicated between the nitrogen storage tank and the upper sealing head jacket, a second nitrogen pipeline is communicated between the first nitrogen pipeline and the lower sealing head jacket, a third nitrogen pipeline is communicated between the second nitrogen pipeline and the barrel jacket, the upper sealing head jacket is communicated with a first detection pipeline, and the lower sealing head jacket is communicated with a second detection pipeline; and the barrel jacket is communicated with a third detection pipeline. The automatic leak detection configuration improves the safety and economy of the leak detection system of the high-pressure equipment in the carbon dioxide stripping urea process, and has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of leakage detection of high-pressure equipment, in particular to an automatic leakage detection device for high-pressure equipment in a carbon dioxide stripping urea process. Background Art

[0002] A company has an annual production of 600,000 tons of alcohol and ammonia co-production project. It uses Xinjiang local bituminous coal as raw material, adopts multi-nozzle opposed water-coal slurry gasification technology, and is equipped with three multi-nozzle opposed water-coal slurry gasifiers. The three gasifiers are set up with two in operation and one in standby, which are used for an annual production of 300,000 tons of methanol, 300,000 tons of synthetic ammonia (intermediate product) and 520,000 tons of urea. The urea unit adopts a stable and mature production process of carbon dioxide stripping process. The high-pressure system of carbon dioxide stripping urea process includes four main equipment: urea synthesis tower, high-pressure methylammonium condenser, high-pressure scrubber, and carbon dioxide stripping tower. These four major equipment are mainly composed of the equipment body and the outer jacket. Once the internal reaction medium of this jacketed high-pressure vessel leaks, the staff cannot detect and find the leak location in time.

[0003] The company uses nitrogen to pass through the jackets of the four major high-pressure equipment for leak detection. The jackets of the four major high-pressure equipment are equipped with exhaust holes and leak detection holes. Check whether there is ammonia and other process media in the sampling medium at the leak detection hole, so as to determine whether there is a leak in the jacket lining to ensure the safe operation of the equipment. However, the leak detection system of the above four major equipment has certain disadvantages in operation: First, when nitrogen is input into the jackets of the four major equipment, the on-site staff is required to manually open the valve on the nitrogen delivery pipeline. If the lining leakage of the four major equipment is small, the leaked medium cannot be discharged cleanly from the exhaust holes on the jacket surface, and it is also very easy to block the exhaust holes, affecting the normal operation of the leak detection system of the four major equipment. Second, when the pressure of the high-pressure system of the carbon dioxide stripping urea production process is lower than 10MPa, if the nitrogen input valve cannot be closed in time, it is easy to cause excessive pressure difference between the inside and outside of the jackets of the four major equipment, resulting in serious deformation of the jacket lining, and ultimately causing significant economic losses to the company. Third, the leak detection method of the leak detection system of the existing four major equipment is regular leak detection. Before or after one of the regular leak detection work starts, the leak detection system cannot monitor the process parameters of the production system in real time, and the staff cannot determine the exact time to close the nitrogen input valve. If the process parameters of the production system become abnormal, if the nitrogen input valve is opened or closed immediately, serious production accidents will occur.

[0004] The high safety hazard and low economic benefit of the leak detection system of the high-pressure equipment in the above-mentioned carbon dioxide stripping urea process have become technical problems that are difficult for enterprises to solve. Summary of the invention

[0005] The utility model provides an automatic leak detection device for high-pressure equipment in a carbon dioxide stripping urea process, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of high safety hazards and low economic benefits in the existing leak detection system of high-pressure equipment in a carbon dioxide stripping urea process.

[0006] The technical scheme of the utility model is realized by the following measures: an automatic leak detection device for high-pressure equipment of a carbon dioxide stripping urea process, comprising a nitrogen storage tank and a high-pressure jacketed container, the high-pressure jacketed container comprising an upper head, a lower head and a cylinder, the upper head, the lower head and the outer surface of the cylinder of the high-pressure jacketed container are all provided with a jacket, a first nitrogen pipeline is fixedly connected between a lower gas outlet of the nitrogen storage tank and a jacket gas inlet of the upper head, a second nitrogen pipeline is fixedly connected between the first nitrogen pipeline and the jacket gas inlet of the lower head, a third nitrogen pipeline is fixedly connected between the second nitrogen pipeline and the jacket gas inlet of the cylinder, a top feed port of the high-pressure jacketed container is fixedly connected with a process feed pipeline, a bottom discharge port of the high-pressure jacketed container is fixedly connected with a process discharge pipeline, a jacket gas outlet of the upper head is fixedly connected with a first detection pipeline, a jacket gas outlet of the lower head is fixedly connected with a second detection pipeline, and a jacket lower gas outlet of the cylinder is fixedly connected with a third detection pipeline.

[0007] The following are further optimizations and / or improvements to the above utility model technical solution:

[0008] The upper head, the lower head and the jacket shell of the cylinder of the high-pressure jacketed container are all provided with exhaust holes.

[0009] The above-mentioned process feed pipeline is fixedly installed with a first pressure gauge and a feed valve in sequence along the medium flow direction, the process discharge pipeline is fixedly installed with a discharge valve and a second pressure gauge in sequence along the medium flow direction, the first detection pipeline is fixedly installed with a first detection valve, the second detection pipeline is fixedly installed with a second detection valve, and the third detection pipeline is fixedly installed with a third detection valve.

[0010] The first nitrogen pipeline between the lower gas outlet of the nitrogen storage tank and the second nitrogen pipeline is fixedly connected with a first venting pipeline.

[0011] A second venting pipeline is fixedly connected between the first nitrogen pipeline between the lower gas outlet of the nitrogen storage tank and the first venting pipeline and the first venting pipeline.

[0012] A first solenoid valve is fixedly installed on the first venting pipeline, and a first nitrogen valve is fixedly installed on the second venting pipeline.

[0013] A thermometer and a flow meter are fixedly installed in sequence along the medium flow direction on the first nitrogen pipeline between the first vent pipeline and the jacket air inlet of the upper head.

[0014] A nitrogen main valve, a nitrogen check valve, a second nitrogen valve, a second solenoid valve, a third nitrogen valve and a third pressure gauge are fixedly installed in sequence along the medium flow direction on the first nitrogen pipeline between the lower gas outlet of the nitrogen storage tank and the second venting pipeline.

[0015] The first nitrogen pipeline between the second nitrogen valve and the second solenoid valve is fixedly connected to the third exhaust pipeline, the first nitrogen pipeline between the second solenoid valve and the third nitrogen valve is fixedly connected to the fourth exhaust pipeline, the fourth nitrogen valve is fixedly installed on the third exhaust pipeline, and the fourth exhaust pipeline is fixedly connected to the fifth nitrogen valve.

[0016] The above device also includes a controller, and the first solenoid valve, the second solenoid valve, the first pressure gauge, the second pressure gauge, the thermometer, the flow meter, and the third pressure gauge are all electrically connected to the controller.

[0017] The utility model has a reasonable and compact structure and is easy to use. It improves the safety and economy of the leak detection system of the high-pressure equipment of the carbon dioxide stripping urea process through the optimized configuration of the process pipeline of the nitrogen leak detection system and the automated electrical connection configuration of the nitrogen leak detection system and the instruments and electromagnetic valves of the carbon dioxide stripping urea process system. It has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 This is a schematic diagram of the process flow of the utility model.

[0019] Attached Figure 1 The codes are as follows: 1 is a nitrogen storage tank, 2 is a high-pressure jacketed container, 3 is an upper head, 4 is a lower head, 5 is a cylinder, 6 is a first nitrogen pipeline, 7 is a second nitrogen pipeline, 8 is a third nitrogen pipeline, 9 is a process feed pipeline, 10 is a process discharge pipeline, 11 is a first detection pipeline, 12 is a second detection pipeline, 13 is a third detection pipeline, 14 is a vent, 15 is a first pressure gauge, 16 is a feed valve, 17 is a discharge valve, 18 is a second pressure gauge, 19 is a first detection valve, 20 is a discharge valve, 21 is a discharge valve, 22 is a discharge valve, 23 is a discharge valve, 24 is a discharge valve, 25 is a discharge valve, 26 is a discharge valve, 27 is a discharge valve, 28 is a discharge valve, 29 is a discharge valve, 30 is a discharge valve, 31 is a discharge valve, 32 is a discharge valve, 33 is a discharge valve, 34 is a discharge valve, 35 is a discharge valve, 36 is a discharge valve, 37 is a discharge valve, 38 is a discharge valve, 39 is a discharge valve, 40 is a discharge valve, 41 is a discharge valve, 42 is a discharge valve, 43 is a discharge valve, 44 is a discharge valve, 45 is a discharge valve, 46 is a discharge valve, 47 is a discharge valve, 48 is a discharge valve, 49 is a discharge valve, 50 is a discharge valve, 51 is a discharge valve, 52 is a discharge valve, 53 is a discharge valve, 54 is a discharge valve, 55 is a discharge valve, 56 is a discharge valve, 57 is a discharge valve, 58 is a discharge valve, 59 is a discharge valve, 60 is a discharge valve, 61 is a discharge valve, 62 is a discharge valve, 63 0 is the second detection valve, 21 is the third detection valve, 22 is the first venting pipeline, 23 is the second venting pipeline, 24 is the first solenoid valve, 25 is the first nitrogen valve, 26 is a thermometer, 27 is a flow meter, 28 is a nitrogen main valve, 29 is a nitrogen check valve, 30 is the second nitrogen valve, 31 is the second solenoid valve, 32 is the third nitrogen valve, 33 is the third pressure gauge, 34 is the third exhaust pipeline, 35 is the fourth exhaust pipeline, 36 is the fourth nitrogen valve, 37 is the fifth nitrogen valve, and 38 is a jacket. DETAILED DESCRIPTION

[0020] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0021] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0023] The present invention is further described below in conjunction with the embodiments and drawings:

[0024] Embodiment 1: As attached Figure 1 As shown, the automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process comprises a nitrogen storage tank 1 and a high-pressure jacketed container 2. The high-pressure jacketed container 2 comprises an upper head 3, a lower head 4, and a cylinder 5. The upper head 3, the lower head 4, and the outer surfaces of the cylinder 5 of the high-pressure jacketed container 2 are all provided with a jacket 38. A first nitrogen pipeline 6 is fixedly connected between the lower gas outlet of the nitrogen storage tank 1 and the gas inlet of the jacket 38 of the upper head 3. A second nitrogen pipeline 6 is fixedly connected between the first nitrogen pipeline 6 and the gas inlet of the jacket 38 of the lower head 4. Line 7, the second nitrogen pipeline 7 is fixedly connected to the air inlet of the jacket 38 of the cylinder 5 with a third nitrogen pipeline 8, the top feed port of the high-pressure jacketed container 2 is fixedly connected to a process feed pipeline 9, the bottom discharge port of the high-pressure jacketed container 2 is fixedly connected to a process discharge pipeline 10, the air outlet of the jacket 38 of the upper head 3 is fixedly connected to a first detection pipeline 11, the air outlet of the jacket 38 of the lower head 4 is fixedly connected to a second detection pipeline 12, and the lower air outlet of the jacket 38 of the cylinder 5 is fixedly connected to a third detection pipeline 13.

[0025] Urea synthesis tower, high-pressure methylammonium condenser, high-pressure scrubber and carbon dioxide stripping tower can all be equipped with the same nitrogen leak detection system as this device. The operating parameters of the nitrogen leak detection system and the operating parameters of the high-pressure system of the carbon dioxide stripping urea process can be monitored in real time to ensure the normal operation of the urea synthesis tower, high-pressure methylammonium condenser, high-pressure scrubber and carbon dioxide stripping tower.

[0026] As needed, the first detection pipeline 11, the second detection pipeline 12, and the third detection pipeline 13 are used to sample whether the medium in the jacket 38 of the upper head 3, the lower head 4, and the cylinder 5 contains other media such as ammonia, so as to determine whether there is leakage of the reaction medium in the high-pressure jacket container 2.

[0027] As required, a plurality of nitrogen input pipelines can be evenly arranged on the upper head 3 , the lower head 4 , and the jacket 38 of the cylinder 5 , so as to uniformly pressurize the jacket 38 of the high-pressure jacket container 2 .

[0028] According to actual needs, the automatic leak detection device of the high-pressure equipment of the carbon dioxide stripping urea process can be further optimized and / or improved:

[0029] Embodiment 2: It is different from Embodiment 1 in that: Figure 1 As shown, exhaust holes 14 are provided on the outer shells of the upper head 3, the lower head 4 and the jacket 38 of the cylinder 5.

[0030] As required, since the maximum working pressure of the nitrogen leak detection system is 0.40 MPa, a number of exhaust holes 14 can be evenly arranged on the outer shell of the jacket 38 of the upper head 3, the lower head 4, and the cylinder 5 for uniform exhaust to ensure pressure balance of the nitrogen leak detection system.

[0031] Embodiment 3: It differs from Embodiment 1 to Embodiment 2 in that: Figure 1 As shown, a first pressure gauge 15 and a feed valve 16 are fixedly installed in sequence on the process feed pipeline 9 along the medium flow direction, a discharge valve 17 and a second pressure gauge 18 are fixedly installed in sequence on the process discharge pipeline 10 along the medium flow direction, a first detection valve 19 is fixedly installed on the first detection pipeline 11, a second detection valve 20 is fixedly installed on the second detection pipeline 12, and a third detection valve 21 is fixedly installed on the third detection pipeline 13.

[0032] Embodiment 4: It differs from Embodiments 1 to 3 in that: Figure 1 As shown, a first venting pipeline 22 is fixedly connected to the first nitrogen pipeline 6 between the lower gas outlet of the nitrogen storage tank 1 and the second nitrogen pipeline 7 .

[0033] As needed, the reaction medium in the high-pressure jacketed container 2 leaks into the jacket 38 . When the content of the leaked medium in the jacket 38 exceeds the standard, the medium in the jacket 38 of the high-pressure jacketed container 2 can be emptied through the first venting pipeline 22 .

[0034] Embodiment 5: It differs from Embodiments 1 to 4 in that: Figure 1 As shown, a second venting pipeline 23 is fixedly connected between the first nitrogen pipeline 6 between the lower gas outlet of the nitrogen storage tank 1 and the first venting pipeline 22 and the first venting pipeline 22 .

[0035] Embodiment 6: It differs from Embodiments 1 to 5 in that: Figure 1 As shown, a first solenoid valve 24 is fixedly installed on the first venting pipeline 22 , and a first nitrogen valve 25 is fixedly installed on the second venting pipeline 23 .

[0036] As required, when the first solenoid valve 24 fails, the first nitrogen valve 25 can be opened to exhaust the gas, which can play a double insurance role.

[0037] Embodiment 7: It differs from Embodiments 1 to 6 in that: Figure 1 As shown, a thermometer 26 and a flow meter 27 are fixedly installed in sequence on the first nitrogen pipeline 6 between the first vent pipeline 22 and the gas inlet of the jacket 38 of the upper head 3 along the flow direction of the medium.

[0038] Embodiment 8: It differs from Embodiments 1 to 7 in that: Figure 1 As shown, a nitrogen main valve 28, a nitrogen check valve 29, a second nitrogen valve 30, a second solenoid valve 31, a third nitrogen valve 32, and a third pressure gauge 33 are fixedly installed in sequence along the medium flow direction on the first nitrogen pipeline 6 between the lower gas outlet of the nitrogen storage tank 1 and the second venting pipeline 23.

[0039] As required, when the reaction medium in the high-pressure jacket container 2 leaks into the jacket 38 , the check valve 29 can prevent the dangerous leaked medium from flowing back into the nitrogen storage tank 1 .

[0040] Embodiment 9: It differs from Embodiments 1 to 8 in that: Figure 1 As shown, the first nitrogen pipeline 6 between the second nitrogen valve 30 and the second solenoid valve 31 is fixedly connected to the third exhaust pipeline 34, the first nitrogen pipeline 6 between the second solenoid valve 31 and the third nitrogen valve 32 is fixedly connected to the fourth exhaust pipeline 35, the third exhaust pipeline 34 is fixedly installed with a fourth nitrogen valve 36, and the fourth exhaust pipeline 35 is fixedly connected to a fifth nitrogen valve 37.

[0041] As needed, when the second solenoid valve 31 fails, the second nitrogen valve 30 and the third nitrogen valve 32 can be closed, and the medium in the first nitrogen pipeline 6 at the inlet and outlet of the second solenoid valve 31 can be emptied through the third exhaust pipeline 34 and the fourth exhaust pipeline 35, and then the second solenoid valve 31 can be repaired or replaced.

[0042] Embodiment 10: It differs from Embodiments 1 to 9 in that: Figure 1 As shown, the device also includes a controller, and the first solenoid valve 24, the second solenoid valve 31, the first pressure gauge 15, the second pressure gauge 18, the thermometer 26, the flow meter 27, and the third pressure gauge 33 are all electrically connected to the controller.

[0043] The operating parameters of the nitrogen leak detection system of the device are monitored in real time according to the third pressure gauge 33, the thermometer 26, and the flow meter 27. The maximum working pressure of the nitrogen leak detection system is 0.40MPa. The pressure of the carbon dioxide stripping urea process system of the device is monitored in real time according to the first pressure gauge 15 and the second pressure gauge 18. When the pressure of the carbon dioxide stripping urea process system is lower than 10MPa, the second solenoid valve 31 is closed, and the first solenoid valve 24 is opened to vent the medium in the nitrogen leak detection system of the device.

[0044] According to the needs, the pipelines and equipment of the automatic leak detection device for high-pressure equipment of the carbon dioxide stripping urea process can also be provided with conventional valves, thermometers and pressure gauges known in the art according to the production needs. The controller is a DCS controller, and the model of the DCS controller can be the CS3000 controller produced by Yokogawa Corporation of Japan.

[0045] The utility model optimizes the configuration of the process pipeline of the nitrogen leak detection system, and the automated electrical connection configuration of the nitrogen leak detection system and the instrument and electromagnetic valve of the carbon dioxide stripping urea production system. When the high-pressure equipment of the carbon dioxide stripping urea process is regularly leak-checked, the pressure in the high-pressure jacket container 2 and the jacket 38 can reach a dynamic pressure difference balance. If the operating parameters of the carbon dioxide stripping urea production system are abnormal, the device controls the nitrogen input through the second electromagnetic valve 31 to ensure the stable pressure balance of the nitrogen leak detection system. The maximum opening pressure can also be set through the first electromagnetic valve 24, which can play an overpressure relief protection role for the nitrogen leak detection system.

[0046] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

[0047] The use process of the embodiment of the utility model is as follows: first, the raw material of the carbon dioxide stripping urea process system enters the high-pressure jacketed container 2 through the process feed pipeline 9, and the product in the high-pressure jacketed container 2 enters the downstream process system through the process discharge pipeline 10 (wherein, the first pressure gauge 15 and the second pressure gauge 18 show that the normal operating pressure of the carbon dioxide stripping urea process system is 10MPa); then, when the high-pressure jacketed container 2 is regularly leak-checked, the nitrogen in the nitrogen storage tank 1 enters the upper head 3, the lower head 4, and the jacket 38 of the cylinder 5 of the high-pressure jacketed container 2 through the first nitrogen pipeline 6, the second nitrogen pipeline 7, and the third nitrogen pipeline 8, respectively, and passes through the exhaust hole on the outer shell of the jacket 38. 14 decompression and exhaust to maintain the dynamic balance of the pressure of the nitrogen leak detection system (wherein the third pressure gauge 33 shows that the maximum working pressure of the nitrogen leak detection system is 0.4MPa); finally, the medium in the jacket 38 of the upper head 3, the lower head 4 and the cylinder 5 is sampled respectively through the first detection pipeline 11, the second detection pipeline 12 and the third detection pipeline 13, and by detecting and analyzing whether there is other medium except nitrogen in the sampled medium, it is determined whether there is leakage of the reaction medium in the high-pressure jacket container 2; in addition, if the first pressure gauge 15 and the second pressure gauge 18 show that the parameters are abnormal, the nitrogen input amount is regulated by the second solenoid valve 31, and the pressure can be relieved and vented through the first venting pipeline 22.

Claims

1. An automatic leak detection device for high-pressure equipment in a carbon dioxide stripping urea process, characterized in that It comprises a nitrogen storage tank and a high-pressure jacketed container. The high-pressure jacketed container comprises an upper head, a lower head and a cylinder. The upper head, the lower head and the outer surface of the cylinder of the high-pressure jacketed container are all provided with a jacket. A first nitrogen pipeline is fixedly connected between the lower gas outlet of the nitrogen storage tank and the jacket gas inlet of the upper head, a second nitrogen pipeline is fixedly connected between the first nitrogen pipeline and the jacket gas inlet of the lower head, a third nitrogen pipeline is fixedly connected between the second nitrogen pipeline and the jacket gas inlet of the cylinder, a top feed port of the high-pressure jacketed container is fixedly connected with a process feed pipeline, a bottom discharge port of the high-pressure jacketed container is fixedly connected with a process discharge pipeline, a first detection pipeline is fixedly connected with the jacket gas outlet of the upper head, a second detection pipeline is fixedly connected with the jacket gas outlet of the lower head, and a third detection pipeline is fixedly connected with the lower gas outlet of the jacket of the cylinder.

2. The automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process according to claim 1, characterized in that The upper head, the lower head and the jacket shell of the cylinder of the high-pressure jacketed container are all provided with exhaust holes.

3. The automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process according to claim 1 or 2, characterized in that A first pressure gauge and a feed valve are fixedly installed in sequence along the medium flow direction on the process feed pipeline; a discharge valve and a second pressure gauge are fixedly installed in sequence along the medium flow direction on the process discharge pipeline; a first detection valve is fixedly installed on the first detection pipeline; a second detection valve is fixedly installed on the second detection pipeline; and a third detection valve is fixedly installed on the third detection pipeline.

4. The automatic leak detection device for high-pressure equipment in a carbon dioxide stripping urea process according to claim 1 or 2, characterized in that A first venting pipeline is fixedly connected to the first nitrogen pipeline between the lower gas outlet of the nitrogen storage tank and the second nitrogen pipeline.

5. The automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process according to claim 4, characterized in that A second venting pipeline is fixedly connected between the first nitrogen pipeline between the lower gas outlet of the nitrogen storage tank and the first venting pipeline and the first venting pipeline.

6. The automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process according to claim 5, characterized in that A first solenoid valve is fixedly installed on the first vent pipeline, and a first nitrogen valve is fixedly installed on the second vent pipeline.

7. The automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process according to claim 6, characterized in that A thermometer and a flow meter are fixedly installed in sequence on the first nitrogen pipeline between the first vent pipeline and the jacket air inlet of the upper head along the medium flow direction.

8. The automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process according to claim 5, 6 or 7, characterized in that A nitrogen main valve, a nitrogen check valve, a second nitrogen valve, a second solenoid valve, a third nitrogen valve and a third pressure gauge are fixedly installed in sequence along the medium flow direction on the first nitrogen pipeline between the lower gas outlet of the nitrogen storage tank and the second venting pipeline.

9. The automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process according to claim 8, characterized in that The first nitrogen pipeline between the second nitrogen valve and the second solenoid valve is fixedly connected with a third exhaust pipeline, the first nitrogen pipeline between the second solenoid valve and the third nitrogen valve is fixedly connected with a fourth exhaust pipeline, the third exhaust pipeline is fixedly installed with a fourth nitrogen valve, and the fourth exhaust pipeline is fixedly connected with a fifth nitrogen valve.

10. The automatic leak detection device for high-pressure equipment in the carbon dioxide stripping urea process according to claim 9, characterized in that It also includes a controller, and the first solenoid valve, the second solenoid valve, the first pressure gauge, the second pressure gauge, the thermometer, the flow meter, and the third pressure gauge are all electrically connected to the controller.

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