Nitrogen recovery energy-saving device
By designing a nitrogen recovery energy-saving device, and using a PLC controller and a nitrogen recovery tank pressure transmitter to automatically control nitrogen recovery, the waste of gaseous nitrogen in liquid nitrogen storage tanks and safety issues have been solved, achieving resource conservation and safe and reliable operation.
Patent Information
- Application Number
- CN202520272745.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-20
AI Technical Summary
In existing technologies, the gaseous nitrogen discharged from liquid nitrogen storage tanks is not recovered, resulting in resource waste, and the safety of liquid nitrogen storage tanks is difficult to guarantee.
A nitrogen recovery and energy-saving device was designed. The system pressure is monitored in real time by a PLC controller and a pressure transmitter of the nitrogen recovery storage tank. The recovery and compression of nitrogen are automatically controlled. The recovered nitrogen is sent to a qualified nitrogen storage tank by an air compressor, thus realizing automated management.
This technology enables the effective recovery of nitrogen, reduces costs, and improves the safety and operational stability of liquid nitrogen storage tanks.
Smart Images
Figure CN223579680U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to nitrogen recovery device field for tire manufacturing, in detail is a kind of nitrogen recovery energy-saving device. BACKGROUND
[0002] It is known that in tire production manufacturing industry, nitrogen is used as the main curing medium for tire curing instead of traditional steam or air, and the inertness and stability of nitrogen make it an ideal curing medium.
[0003] Tire curing using nitrogen must be matched with corresponding nitrogen manufacturing equipment, and to output qualified nitrogen, it needs to be matched with related equipment, such as water pump, cooling tower, air compressor, nitrogen generator, etc. The nitrogen used for tire curing not only has requirements on pressure, but also has strict requirements on nitrogen purity, otherwise it will cause batch of unqualified products, and will cause collective failure of curing machine equipment. The deep cooling nitrogen used at present is more efficient, but the air and nitrogen consumption output ratio is 3:1, which needs to consume more air, and nitrogen is not like water, electricity, wind and other media that can be used immediately, but needs complex process to output finished product nitrogen, and it takes 8 hours from starting the deep cooling nitrogen generator to output finished product nitrogen.
[0004] When the nitrogen generator is normally running, the liquid nitrogen storage tank is in a hot standby state, because the temperature of the liquid nitrogen in the liquid nitrogen tank is about-190℃, and the outside temperature is high, with continuous heat exchange with the outside, the temperature and pressure of part of the liquid nitrogen in the liquid nitrogen storage tank will rise, causing part of the liquid nitrogen to be gasified into gaseous nitrogen. To maintain the temperature and pressure of the liquid nitrogen storage tank, and to maintain the liquid level of the liquid nitrogen in the liquid nitrogen storage tank, part of the gaseous nitrogen needs to be discharged, and new liquid nitrogen needs to be supplemented.
[0005] According to the requirements in "Safety Operation Rules for Liquid Nitrogen Storage Tank", to ensure the safe operation of the liquid nitrogen storage tank, it is necessary to ensure that the stop valve is in the normal open state, the pressure regulating valve is adjusted to a reasonable range, and the gaseous nitrogen is automatically discharged. After this part of nitrogen is discharged, it is not recycled, which is a waste. SUMMARY
[0006] In order to overcome the shortcomings of the prior art, the utility model provides a nitrogen recovery energy-saving device, which can recover part of the nitrogen and save cost.
[0007] The utility model discloses a technical scheme that solves its technical problem is: a nitrogen recovery energy -conserving device is equipped with liquid nitrogen storage tank, and liquid nitrogen storage tank pressure gauge is installed on liquid nitrogen storage tank, and the cavity of liquid nitrogen storage tank is connected with first stop valve one end through exhaust pipe, and the other end of first stop valve is connected with pressure regulating valve, and the gas outlet of pressure regulating valve is connected with safety valve, and its characterized in that, the gas outlet of pressure regulating valve and safety valve gas inlet are communicated with second stop valve, and the other end of second stop valve is communicated with nitrogen recovery tank, and nitrogen recovery tank pressure transmitter is installed in nitrogen recovery tank, and nitrogen recovery tank pressure transmitter is connected with PLC controller through data line, and the gas outlet of nitrogen recovery tank is connected with air compressor through electric control valve, and the gas inlet of air compressor is connected with qualified nitrogen storage tank, and PLC controller is connected with electric control valve and air compressor, and qualified nitrogen storage tank pressure gauge is installed on qualified nitrogen storage tank.
[0008] The utility model discloses a beneficial effect is, simple structure, safe and reliable, can automatic nimble control's nitrogen recovery, and reduce the security risk. DRAWINGS
[0009] The utility model discloses further illustrate in combination with the drawings and examples.
[0010] Figure 1 The utility model discloses a structural schematic diagram.
[0011] In the drawing, 1. liquid nitrogen storage tank, 2. first stop valve, 3. pressure regulating valve, 4. safety valve, 5. second stop valve, 6. nitrogen recovery tank, 7. electric control valve, 8. air compressor, 9. qualified nitrogen storage tank, 10. liquid nitrogen storage tank pressure gauge, 11. nitrogen recovery tank pressure transmitter, 12. qualified nitrogen storage tank pressure gauge. SPECIFIC IMPLEMENTATION
[0012] In the drawing, the utility model is equipped with liquid nitrogen storage tank 1, and liquid nitrogen storage tank pressure gauge 10 is installed on liquid nitrogen storage tank 1, and the cavity of liquid nitrogen storage tank 1 is connected with first stop valve 2 one end through exhaust pipe, and the other end of first stop valve 2 is connected with pressure regulating valve 3, and the gas outlet of pressure regulating valve 3 is connected with safety valve 4, and the gas outlet of pressure regulating valve 3 and safety valve 4 gas inlet are communicated with second stop valve 5, and the other end of second stop valve 5 is communicated with nitrogen recovery tank 6, and nitrogen recovery tank pressure transmitter 11 is installed in nitrogen recovery tank 6, and nitrogen recovery tank pressure transmitter 11 is connected with PLC controller through data line, and the gas outlet of nitrogen recovery tank 6 is connected with air compressor 8 through electric control valve 7, and the gas inlet of air compressor 8 is connected with qualified nitrogen storage tank 9, and qualified nitrogen storage tank pressure gauge 12 is installed on qualified nitrogen storage tank 9, and PLC controller is connected with state indicating lamp, display panel, electric control valve 7 and air compressor 8 respectively, and PLC controller controls electric control valve 7 and air compressor 8 action.
[0013] Install second stop valve 5 on exhaust pipe, install safety valve 4 between safety valve 4 and second stop valve 5, the pressure of safety valve 4 is less than the pressure of liquid nitrogen storage tank 1, otherwise it can not discharge gaseous nitrogen of liquid nitrogen storage tank 1, and the pressure of liquid nitrogen storage tank 1 is increased, and there is a security risk.The rear end of second stop valve 5 is connected to nitrogen recovery tank 6, which is convenient for storing nitrogen, and electric control valve 7 is installed on the rear side of nitrogen recovery tank 6, and air compressor 8 is connected to the inlet of electric control valve 7.When the pressure in nitrogen recovery tank 6 reaches the set value, the nitrogen recovery tank pressure transmitter 11 signal is transmitted to the PLC controller, and the air compressor 8 is automatically started by the PLC controller, and the nitrogen is compressed and sent to the qualified nitrogen storage tank 9.When the pressure in nitrogen recovery tank 6 is lower than the set value, the air compressor 8 is automatically stopped by the PLC controller, and the qualified nitrogen storage tank pressure gauge 12 on the qualified nitrogen storage tank 9 shows the qualified nitrogen pressure.
[0014] The utility model discloses a PLC controller and nitrogen recovery tank pressure transmitter 11 can monitor system pressure value in real time, when pressure reaches set value, can control in first time, makes pressure not more than safety valve take-off pressure, ensures system safe operation, reaches nitrogen recovery purpose simultaneously, need not personnel to participate, and system is automatically controlled, and it is reasonable in structure, and it is stable in operation, and it is simple and easy to operate with remarkable advantages.
Claims
1. A nitrogen recovery and energy-saving device, comprising a liquid nitrogen storage tank, a liquid nitrogen storage tank pressure gauge installed on the liquid nitrogen storage tank, the cavity of the liquid nitrogen storage tank being connected to one end of a first shut-off valve via an exhaust pipe, the other end of the first shut-off valve being connected to a pressure-reducing regulating valve, and the outlet of the pressure-reducing regulating valve being connected to a safety valve, characterized in that, The outlet of the pressure reducing regulating valve and the inlet of the safety valve are connected to the second shut-off valve. The other end of the second shut-off valve is connected to the nitrogen recovery tank. A nitrogen recovery tank pressure transmitter is installed inside the nitrogen recovery tank. The nitrogen recovery tank pressure transmitter is connected to the PLC controller via a data cable. The outlet of the nitrogen recovery tank is connected to the air compressor via an electric control valve. The air compressor's outlet is connected to a qualified nitrogen storage tank. The PLC controller is connected to the electric control valve and the air compressor. A qualified nitrogen storage tank pressure gauge is installed on the qualified nitrogen storage tank.