Standby security nitrogen supply device for shutdown maintenance of chemical plant
By designing a nitrogen supply device that includes components such as a liquid inlet pipe, a support frame, a heating tank, and a slide tube, and utilizing ambient heat to vaporize liquid nitrogen, the problem of nitrogen supply interruption during shutdown and maintenance at a chemical plant was solved, and continuous nitrogen supply and flow regulation were achieved, ensuring the safety and efficiency of equipment maintenance.
Patent Information
- Application Number
- CN202423098558.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-14
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-12-14
AI Technical Summary
The existing backup security nitrogen supply device was unable to supply nitrogen normally due to power outage during the chemical plant's shutdown and maintenance, affecting the safety of equipment maintenance.
A backup safety nitrogen supply device was designed, which included a liquid inlet pipe, a support frame, an outlet pipe, a heating tank, a water bath, a heater and a slide tube. The device used ambient heat to vaporize liquid nitrogen, and regulated the nitrogen flow rate through a guide pipe and an outlet valve to ensure the continuity and stability of the nitrogen supply.
During shutdown and maintenance, liquid nitrogen is vaporized by ambient heat, achieving a continuous supply of nitrogen, ensuring the safety and efficiency of equipment maintenance, and avoiding nitrogen supply interruptions caused by power outages.
Smart Images
Figure CN223411854U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of gas cryogenic separation, in particular to a standby safety nitrogen supply device used when a chemical plant is shut down for maintenance. Background Art
[0002] In the daily operations of chemical plants, regular equipment maintenance is a crucial component in ensuring production safety and efficiency. Especially during shutdowns and maintenance, to ensure the safety of process piping, vessels, and other equipment, inert gases (such as nitrogen) are often required to displace or fill these spaces. This prevents oxygen in the air from coming into contact with residual combustible materials and potentially causing fires or explosions. Therefore, providing a reliable and efficient nitrogen supply system is crucial to ensuring safety during maintenance.
[0003] The existing backup security nitrogen supply system supplied nitrogen through a water-bath vaporizer, which provided heat for vaporizing liquid nitrogen. The liquid nitrogen was then vaporized and transported to the required locations. However, during the plant shutdown and maintenance, which required a power outage, the water-bath vaporizer was no longer able to supply nitrogen, and the security nitrogen required for maintenance was also disrupted. Utility Model Content
[0004] In order to overcome the disadvantage that the existing backup safety nitrogen supply device supplies nitrogen through a water bath vaporizer, and when the factory is shut down for maintenance, the water bath vaporizer cannot continue to supply nitrogen, the purpose of the utility model is to provide a backup safety nitrogen supply device for chemical plants when they are shut down for maintenance.
[0005] The technical solution of the utility model is: a backup security nitrogen supply device for use in chemical plants during shutdown and maintenance, comprising a liquid inlet pipe, a support frame, an air outlet pipe, a protective shell, a heating tank, a heating pipe, a water bath pipe, a water inlet valve, a water level sensor, a heater, a slide pipe and a flow guide pipe, a heating tank is provided on the right side of the top of the support frame, a protective shell is provided on the outside of the heating tank, a water inlet valve is provided on the lower front end of the heating tank, a water level sensor is provided on the inner top end of the heating tank, a liquid inlet pipe is provided on the rear side of the heating tank, an air outlet pipe is provided on the front side of the heating tank, a water bath pipe is provided inside the heating tank, and a liquid inlet of the water bath pipe passes through the rear end of the heating tank and is connected to the liquid outlet on the right end of the liquid inlet pipe. The air outlet of the water bath tube passes through the top of the heating tank and is connected to the air inlet at the right end of the air outlet pipe. A heater is provided at the top of the heating tank, and the bottom end of the heater is connected to a heating pipe. Multiple groups of scallop tubes are arranged at intervals in front and back on the left side of the top of the support frame. The top ends of the adjacent scallop tubes on the left side of the same group of scallop tubes, the top ends of the adjacent scallop tubes on the right side of the same group of scallop tubes and the bottom ends of the adjacent scallop tubes in the middle of the same group of scallop tubes are all provided with guide pipes. Adjacent groups of scallop tubes are connected by guide pipes. The air outlet of the left scallop tube at the front end is connected to the air outlet at the left end of the air outlet pipe, and the air inlet of the left scallop tube at the rear end is connected to the liquid outlet at the left end of the liquid inlet pipe.
[0006] Optionally, the liquid inlet pipe and the air outlet pipe are both Y-shaped pipes, and the sheet pipe is a polygonal prism-shaped pipe.
[0007] Optionally, a liquid inlet valve is further included, and the air inlet of the liquid inlet pipe is connected to the liquid inlet valve.
[0008] Optionally, a backup battery and an electric valve are also included. A backup battery is provided at the top of the protective shell, and an electric valve is connected to the water outlet at the right end of the liquid inlet pipe. The electric valve is electrically connected to the backup battery.
[0009] Optionally, a buffer tank and an air outlet valve are further included. The air outlet of the air outlet pipe is connected to the buffer tank, and the air outlet valve is provided at the lower front end of the buffer tank.
[0010] Optionally, a drain valve is also included. The lower right end of the protective shell is provided with a drain valve, and the water inlet of the drain valve passes through the protective shell and the heating tank.
[0011] Optionally, a protective top is also included, and a protective top is provided on the top of the heating tank.
[0012] The utility model has the following advantages: 1. By connecting each group of sliver tubes through the guide tube, the ambient heat can be maximized to promote the gasification of liquid nitrogen. When the heating tank cannot heat the nitrogen, the gasified nitrogen can be obtained through the sliver tube.
[0013] 2. By controlling the outlet valve, adjust the output flow of nitrogen to ensure that the nitrogen supply meets actual demand. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.
[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model from another perspective.
[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the internal components of the heating tank of the present invention.
[0017] Figure 4 It is a three-dimensional structural diagram of the components such as the scallop tube and the buffer tank of the utility model.
[0018] Markings in the accompanying drawings: 1-liquid inlet valve, 2-liquid inlet pipe, 3-support frame, 4-air outlet pipe, 5-buffer tank, 6-air outlet valve, 7-electric valve, 8-protective shell, 9-heating tank, 10-heating tube, 11-water bath tube, 12-drain valve, 13-water inlet valve, 14-water level sensor, 15-protective top, 16-spare battery, 17-heater, 19-slide tube, 20-guide tube. DETAILED DESCRIPTION
[0019] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.
[0020] A backup nitrogen supply device for chemical plants during shutdown and maintenance, such as Figures 1-4As shown, it includes a liquid inlet valve 1, a liquid inlet pipe 2, a support frame 3, an air outlet pipe 4, a protective shell 8, a heating tank 9, a heating pipe 10, a water bath pipe 11, a drain valve 12, a water inlet valve 13, a water level sensor 14, a protective top 15, a heater 17, a slide tube 19 and a guide pipe 20. A heating tank 9 is provided on the right side of the top of the support frame 3. The outer side of the heating tank 9 is covered with a protective shell 8. The protective shell 8 can prevent people from directly contacting the surface of the heating tank 9 and preventing people from being scalded by the heating tank 9. A drain valve 12 is provided at the lower right end of the protective shell 8. The water inlet of the drain valve 12 passes through the protective shell 8 and the heating tank 9. A protective top 15 is provided on the top of the heating tank 9. The protective top 15 is installed on the top of the heating tank 9. It plays a protective role to prevent external impurities from entering the top of the heating tank 9. A water inlet valve 13 is provided at the lower front end of the heating tank 9. A water level sensor 14 is provided at the inner top of the heating tank 9. The water level sensor 14 detects the water level in the heating tank 9 to ensure that the water level is within a safe range. If the water level inside the heating tank 9 is too high, the drain valve 12 can be opened to discharge the excess water in the heating tank 9. A liquid inlet pipe 2 is provided on the rear side of the heating tank 9. The liquid inlet of the liquid inlet pipe 2 is connected to a liquid inlet valve 1. By controlling the opening and closing of the liquid inlet valve 1, the liquid nitrogen can be controlled to enter the liquid pipe 2. An air outlet pipe 4 is provided on the front side of the heating tank 9. Both the liquid inlet pipe 2 and the air outlet pipe 4 are Y-shaped pipes. A water bath pipe 11 is provided inside the heating tank 9. The water bath pipe 1 The liquid inlet of 1 passes through the rear end of the heating tank 9 and is connected to the liquid outlet at the right end of the liquid inlet pipe 2. The air outlet of the water bath pipe 11 passes through the top of the heating tank 9 and is connected to the air inlet at the right end of the air outlet pipe 4. A heater 17 is provided at the top of the heating tank 9. The bottom end of the heater 17 is connected to the heating pipe 10. When the heater 17 is started, the heater 17 transfers heat to the water in the heating tank 9 through the heating pipe 10, forming a water bath environment for liquid nitrogen heating. A plurality of groups of sliver tubes 19 are arranged at intervals on the front and back of the left side of the top of the support frame 3. The top ends of the adjacent sliver tubes 19 on the left side of the same group of sliver tubes 19, the top ends of the adjacent sliver tubes 19 on the right side of the same group of sliver tubes 19, and the bottom ends of the adjacent sliver tubes 19 in the middle of the same group of sliver tubes 19 are all A guide pipe 20 is provided, and adjacent groups of sliver tubes 19 are connected by the guide pipe 20. The air outlet of the left-most sliver tube 19 at the front is connected to the air outlet at the left end of the air outlet pipe 4, and the air inlet of the left-most sliver tube 19 at the rear is connected to the liquid outlet at the left end of the liquid inlet pipe 2. The sliver tube 19 is a polygonal prism-shaped tube. Liquid nitrogen enters the sliver tube 19 from the air outlet at the left end of the liquid inlet pipe 2. The nitrogen entering the sliver tube 19 enters the next sliver tube 19 through the guide pipe 20. During this process, the nitrogen gradually absorbs heat from the air and is converted from liquid to gas, and is finally discharged from the air outlet of the left-most sliver tube 19 at the front. The polygonal prism-shaped structure of the sliver tube 19 greatly increases the contact area with the air.
[0021] like Figure 3As shown, a backup battery 16 and an electric valve 7 are also included. A backup battery 16 is provided at the top of the protective shell 8. The electric valve 7 is connected to the water outlet at the right end of the liquid inlet pipe 2. The electric valve 7 is electrically connected to the backup battery 16. The backup battery 16 provides power for the electric valve 7 to ensure that the electric valve 7 can still work normally when the main power fails, preventing liquid nitrogen from entering the water bath tube 11 and flowing into the air outlet pipe 4, causing the air outlet pipe 4 to be frozen.
[0022] like Figure 1 and Figure 2 As shown, it also includes a buffer tank 5 and an air outlet valve 6. The air outlet of the air outlet pipe 4 is connected to the buffer tank 5. The air outlet valve 6 is provided at the lower front end of the buffer tank 5. The function of the buffer tank 5 is to stabilize the pressure of the nitrogen, prevent pressure changes caused by pipeline fluctuations, and ensure the smooth output of nitrogen. People can adjust the output flow of nitrogen by controlling the air outlet valve 6 to ensure that the supply of nitrogen meets actual needs.
[0023] Before using the device, the liquid inlet valve 1 is connected to the liquid nitrogen supply device, the water inlet valve 13 is connected to the natural water pipe, the water inlet valve 13 is opened, a certain amount of water is added to the heating tank 9, the heater 17 is started, and the heater 17 transfers heat to the water in the heating tank 9 through the heating pipe 10 to form a water bath environment. The liquid inlet valve 1 is opened to allow liquid nitrogen to enter the liquid inlet pipe 2. A portion of the liquid nitrogen enters the slide tube 19 from the liquid outlet at the left end of the liquid inlet pipe 2. The nitrogen entering the slide tube 19 enters the next slide tube 19 through the guide pipe 20. In this process, the nitrogen gradually absorbs heat from the air and is converted from liquid to gas, and finally exits from the outlet of the slide tube 19 on the left end. The gas is discharged from the air outlet and enters the air outlet pipe 4 from the air inlet at the left end of the air outlet pipe 4. The other part of the liquid nitrogen enters the water bath pipe 11 from the liquid outlet at the right end of the liquid inlet pipe 2, and enters the water bath environment in the heating tank 9 through the liquid inlet of the water bath pipe 11. The liquid nitrogen is heated in the water bath pipe 11 and converted into nitrogen. It enters the air outlet pipe 4 from the air inlet at the right end of the air outlet pipe 4 through the air outlet of the water bath pipe 11. The nitrogen reaching the air outlet pipe 4 finally enters the buffer tank 5 through the air outlet of the air outlet pipe 4. If the heating tank 9 cannot heat the nitrogen, the electric valve 7 is controlled to be closed so that the nitrogen cannot enter the water bath pipe 11. At this time, the vaporized nitrogen can be obtained through the film tube 19.
[0024] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present invention.
Claims
1. A backup nitrogen supply device for safety during shutdown and maintenance in a chemical plant, comprising a support frame (3), a protective shell (8) and a heating tank (9), wherein the heating tank (9) is provided on the right side of the top of the support frame (3), and the outer side of the heating tank (9) is covered with a protective shell (8), and the device is characterized in that: The heating tank (9) further comprises a liquid inlet pipe (2), an air outlet pipe (4), a heating pipe (10), a water bath pipe (11), a water inlet valve (13), a water level sensor (14), a heater (17), a slide pipe (19) and a flow guide pipe (20). The water level sensor (14) is provided at the inner top of the heating tank (9), the water inlet valve (13) is provided at the lower front end of the heating tank (9), the liquid inlet pipe (2) is provided at the rear side of the heating tank (9), the air outlet pipe (4) is provided at the front side of the heating tank (9), the water bath pipe (11) is provided inside the heating tank (9), the liquid inlet of the water bath pipe (11) passes through the rear end of the heating tank (9) and is connected to the liquid outlet at the right end of the liquid inlet pipe (2), the air outlet of the water bath pipe (11) passes through the top of the heating tank (9) and is connected to the air inlet at the right end of the air outlet pipe (4). A heater (17) is provided at the top end of the heating tank (9), and a heating pipe (10) is connected to the bottom end of the heater (17). A plurality of groups of scallop tubes (19) are arranged at intervals on the front and rear sides of the top left side of the support frame (3). The top ends of the scallop tubes (19) adjacent to the left side of the same group of scallop tubes (19), the top ends of the scallop tubes (19) adjacent to the right side of the same group of scallop tubes (19), and the bottom ends of the scallop tubes (19) adjacent to the middle of the same group of scallop tubes (19) are all provided with flow guide tubes (20). Adjacent groups of scallop tubes (19) are connected through the flow guide tubes (20). The air outlet of the scallop tube (19) at the front end is connected to the air outlet at the left end of the air outlet pipe (4), and the air inlet of the scallop tube (19) at the rear end is connected to the liquid outlet at the left end of the liquid inlet pipe (2).
2. The backup safety nitrogen supply device for a chemical plant during shutdown and maintenance according to claim 1 is characterized by: The liquid inlet pipe (2) and the air outlet pipe (4) are both Y-shaped pipes, and the sheet pipe (19) is a polygonal prism-shaped pipe.
3. The backup safety nitrogen supply device for a chemical plant during shutdown and maintenance according to claim 2 is characterized in that: It also includes a liquid inlet valve (1), and the air inlet of the liquid inlet pipe (2) is connected to the liquid inlet valve (1).
4. The backup safety nitrogen supply device for a chemical plant during shutdown and maintenance according to claim 3 is characterized by: The invention also includes a backup battery (16) and an electric valve (7). The top of the protective shell (8) is provided with the backup battery (16). The water outlet at the right end of the liquid inlet pipe (2) is connected with the electric valve (7). The electric valve (7) is electrically connected to the backup battery (16).
5. The backup safety nitrogen supply device for a chemical plant during shutdown and maintenance according to claim 4 is characterized in that: It also includes a buffer tank (5) and an air outlet valve (6). The air outlet of the air outlet pipe (4) is connected to the buffer tank (5), and the air outlet valve (6) is provided at the lower front end of the buffer tank (5).
6. The backup safety nitrogen supply device for use in a chemical plant during shutdown and maintenance according to claim 5 is characterized by: The utility model also comprises a drain valve (12). The lower right end of the protective shell (8) is provided with the drain valve (12). The water inlet of the drain valve (12) passes through the protective shell (8) and the heating tank (9).
7. The backup safety nitrogen supply device for use in a chemical plant during shutdown and maintenance according to claim 6 is characterized by: The heating tank (9) further comprises a protective top (15), and the top end of the heating tank (9) is provided with the protective top (15).