Cold energy recovery system

Abstract

The utility model provides a cold energy recovery system, which comprises a gasification device, a cold energy recovery device and a cold energy recovery device, the cooling capacity storage device is connected with the gasification device and used for recycling the cooling capacity in the gaseous nitrogen, and a water supply pipe and a water return pipe are arranged on the cooling capacity storage device; the at least one terminal device is communicated with the cooling capacity storage device, the water supply pipe provides low-temperature water required by use for the terminal device, and the terminal device conveys the used water to the cooling capacity storage device through the water return pipe; the monitoring control device is connected with the cooling capacity storage device and the water supply pipe and used for monitoring the water temperature of the water supply pipe and controlling the flow of the gaseous nitrogen in the cooling capacity storage device; the temperature control valve is located on the water supply pipe and used for automatically adjusting water flow in the water supply pipe according to the monitored water temperature of the water supply pipe so as to maintain the water temperature in the water supply pipe within a preset range; and the cold energy is recycled and utilized in the liquid nitrogen gasification process, the effects of energy conservation and consumption reduction are achieved, and the application range is wide.

Description

Technical Field

[0001] This utility model relates to the field of recycling system technology, specifically to a cold energy recovery system. Background Technology

[0002] Nitrogen, as an important inert gas, is widely used in various processes, such as protective atmosphere, cooling, and cleaning. Due to its low-temperature properties, liquid nitrogen is typically stored in dedicated liquid nitrogen tanks. When needed, the liquid nitrogen in the tanks must be vaporized into gaseous nitrogen by a vaporizer before being transported to the point of use.

[0003] In traditional liquid nitrogen usage, liquid nitrogen is discharged from a storage tank and converted into gaseous nitrogen through a vaporizer. During this process, the liquid nitrogen releases a significant amount of cooling energy. However, this cooling energy is often not effectively utilized and is directly released into the environment, resulting in energy waste.

[0004] Therefore, how to utilize the large amount of cooling energy released by liquid nitrogen to achieve energy conservation and consumption reduction is a technical problem that urgently needs to be solved. Utility Model Content

[0005] The problem solved by this utility model is to provide a cold energy recovery system that realizes the recovery and utilization of cold energy during the liquid nitrogen vaporization process, thereby achieving energy saving and consumption reduction, and has a wide range of applications.

[0006] To address the aforementioned problems, this utility model provides a cold energy recovery system, comprising: a vaporization device for converting liquid nitrogen into gaseous nitrogen; a cold energy storage device connected to the vaporization device for recovering the cold energy from the gaseous nitrogen, the cold energy storage device having a water supply pipe and a water return pipe; at least one terminal device connected to the cold energy storage device, the water supply pipe providing the terminal device with low-temperature water for use, the terminal device delivering used water to the cold energy storage device through the water return pipe; a monitoring and control device connected to the cold energy storage device and the water supply pipe for monitoring the water temperature of the water supply pipe and controlling the flow rate of the gaseous nitrogen in the cold energy storage device; and a temperature control valve located on the water supply pipe for automatically adjusting the water flow in the water supply pipe according to the monitored water temperature to maintain the water temperature in the water supply pipe within a preset range.

[0007] Optionally, the monitoring and control device includes: a temperature sensor installed on the water supply pipe for monitoring the water temperature in the water supply pipe; a flow controller connected between the gasification device and the cold storage device for adjusting the flow rate of the gaseous nitrogen according to the monitoring data of the temperature sensor; and a control unit connected to the temperature sensor and the flow controller for controlling the opening and closing of the water supply pipe according to the monitoring data of the temperature sensor and sending adjustment commands to the temperature control valve.

[0008] Optionally, the temperature control valve is used to receive the adjustment command to adjust the water flow in the water supply pipe in order to maintain the water temperature in the water supply pipe within a preset range.

[0009] Optionally, it also includes an optimization device connected to the monitoring and control device, used to optimize the operating parameters of the cold storage device based on historical monitoring data and prediction models of the temperature sensor.

[0010] Optionally, the operating parameters of the cold storage device include: water temperature adjustment parameters in the water supply pipe, used to adjust the water temperature in the water supply pipe according to the needs of the terminal device; pressure threshold setting parameters for the water supply pipe and the return pipe, used to ensure operation within a safe pressure range; and flow rate adjustment parameters, used to control the water flow rate through the water supply pipe and the return pipe to adapt to different water temperature requirements.

[0011] Optionally, the monitoring and control device further includes: a data unit connected to the control unit for collecting and analyzing data provided by the temperature sensor and the flow controller; and a user interface connected to the data unit for allowing users to view the status of the terminal device and adjust the parameters of the terminal device.

[0012] Optionally, the terminal device is an air conditioning unit for regulating indoor temperature and humidity. The air conditioning unit receives low-temperature water from the cold storage device through the water supply pipe and returns the used water to the cold storage device through the return water pipe.

[0013] Optionally, the air conditioning unit is connected to the water supply pipe via a water supply interface, and the air conditioning unit is connected to the return water pipe via a return water interface. The water supply interface and the return water interface are connected by a quick-disconnect type.

[0014] Optionally, the air conditioning unit also includes an internal water circulation system for cooling and dehumidifying indoor air using low-temperature water; and a power pump for driving the circulation of water between the water supply pipe and the water return pipe.

[0015] Optionally, a liquid nitrogen storage tank connected to the vaporization device may also be included.

[0016] Optionally, the cold storage device is provided with an outlet for discharging the gaseous nitrogen to the nitrogen usage point after recovering the cold energy from the gaseous nitrogen.

[0017] Optionally, it may also include a safety monitoring unit connected to the monitoring and control device, for monitoring the monitoring and control device and automatically taking safety measures when an abnormality is detected.

[0018] Optionally, the cold storage device is a heat exchanger, which includes multiple heat exchange units connected in parallel.

[0019] Optionally, the gasification device is a gasifier.

[0020] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0021] In the technical solution of the cold energy recovery system of this utility model, the precise control and optimization of the liquid nitrogen cold energy recovery process is achieved through the joint operation of the gasification device, the cold energy storage device, the terminal device, the monitoring and control device and the temperature control valve. This helps to improve energy utilization efficiency, reduce energy consumption and ensure the stable operation of the system under different operating conditions.

[0022] Furthermore, the monitoring and control device includes a temperature sensor installed on the water supply pipe and a flow controller connected between the vaporization device and the cold storage device. The temperature sensor monitors the water temperature in the water supply pipe, and the flow controller adjusts the flow rate of gaseous nitrogen based on the monitoring data. If the water temperature is higher than a preset range, the flow controller increases the flow rate of gaseous nitrogen to improve the cooling effect; if the water temperature is lower than the preset range, the flow rate of gaseous nitrogen is reduced to avoid over-cooling. This automatic adjustment mechanism ensures that the water temperature in the water supply pipe is maintained within the preset range, thereby meeting the temperature requirements of different rooms. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the cold energy recovery system in one embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the cold energy recovery system in another embodiment of the present invention. Detailed Implementation

[0025] Currently, in many liquid nitrogen storage tanks, after the liquid nitrogen passes through a vaporizer, the gaseous nitrogen is directly transported to various points of use. The cooling energy released during the conversion of liquid nitrogen to gaseous nitrogen is not recovered or utilized, which to some extent leads to a waste of resources.

[0026] Based on this, the present invention provides a cold energy recovery system, which achieves precise control and optimization of the liquid nitrogen cold energy recovery process through the joint operation of a vaporization device, a cold energy storage device, a terminal device, a monitoring and control device, and a temperature control valve. This helps to improve energy utilization efficiency, reduce energy consumption, and ensure the stable operation of the system under different operating conditions.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] First, please refer to Figure 1 A cold energy recovery system 100 includes a gasification device 101, a cold energy storage device 102, and a terminal device 103.

[0029] In this embodiment, a vaporization device 101 is used to convert liquid nitrogen into gaseous nitrogen; a cold storage device 102, connected to the vaporization device 101, is used to recover the cold energy in the gaseous nitrogen, and the cold storage device 102 has a water supply pipe 102a and a water return pipe 102b; at least one terminal device 103 is connected to the cold storage device 102, the water supply pipe 102a provides the terminal device 103 with the low-temperature water required for use, and the terminal device 103 transports the used water to the cold storage device 102 through the water return pipe 102b.

[0030] The arrows on the solid lines in the diagram indicate the direction of water flow, while the arrows on the dashed lines indicate the direction of nitrogen flow (including liquid nitrogen and gaseous nitrogen).

[0031] In this embodiment, a monitoring and control device (not shown in the figure) is also included, which is connected to the cold storage device 102 and the water supply pipe 102a, and is used to monitor the water temperature of the water supply pipe 102a and control the flow rate of the gaseous nitrogen in the cold storage device 102.

[0032] In this embodiment, a temperature control valve (not shown in the figure) is also included, located on the water supply pipe 102a, for automatically adjusting the water flow in the water supply pipe 102a according to the monitored water temperature of the water supply pipe 102a to maintain the water temperature in the water supply pipe 102a within a preset range.

[0033] In this embodiment, the cold energy recovery system 100 achieves precise control and optimization of the liquid nitrogen cold energy recovery process through the joint operation of the vaporization device 101, the cold energy storage device 102, the terminal device 103, the monitoring and control device, and the temperature control valve. This helps to improve energy utilization efficiency, reduce energy consumption, and ensure the stable operation of the system under different operating conditions.

[0034] In this embodiment, the number of temperature control valves is one or more. When all the terminal devices 103 require the same temperature, multiple terminal devices 103 can share one temperature control valve; when different terminal devices 103 require different temperatures, one terminal device 103 corresponds to one temperature control valve.

[0035] It should be noted that the terminal device 103 here is used to regulate the indoor temperature and humidity, so the temperature required by the terminal device 103 refers to the temperature that the terminal device 103 can ultimately bring the indoor temperature to the required temperature.

[0036] In this embodiment, the number of terminal devices 103 is one.

[0037] In some embodiments, the number of terminal devices 103 may also be multiple, for example... Figure 2 In this embodiment, there are three terminal devices 103. Multiple terminal devices 103 can be connected in series to the cold storage device 102 or in parallel to the cold storage device 102.

[0038] In this embodiment, the gasification device 101 is a gasifier.

[0039] In this embodiment, a liquid nitrogen storage tank 104 connected to the vaporization device 101 is also included, and the liquid nitrogen storage tank 104 contains liquid nitrogen.

[0040] In this embodiment, the cold storage device 102 is a heat exchanger, which includes multiple heat exchange units connected in parallel.

[0041] The cold energy storage device 102 may also be provided with an internal flow channel to optimize the flow path of water and gaseous nitrogen to improve the cold energy recovery efficiency. It may also be made of corrosion-resistant materials to adapt to different working environments and improve the durability of the system.

[0042] In this embodiment, the cold storage device 102 is provided with an outlet for discharging the gaseous nitrogen to the nitrogen usage point 105 after recovering the cold energy from the gaseous nitrogen.

[0043] In this embodiment, the monitoring and control device includes: a temperature sensor (not shown in the figure) installed on the water supply pipe 102a for monitoring the water temperature in the water supply pipe 102a; a flow controller connected between the vaporization device 101 and the cold storage device 102 for adjusting the flow rate of the gaseous nitrogen according to the monitoring data of the temperature sensor; and a control unit connected to the temperature sensor and the flow controller for controlling the opening and closing of the water supply pipe 102a according to the monitoring data of the temperature sensor and sending adjustment commands to the temperature control valve.

[0044] In this embodiment, the temperature control valve (not shown in the figure) is used to receive the adjustment command to adjust the water flow in the water supply pipe 102a so as to maintain the water temperature in the water supply pipe 102a within a preset range.

[0045] In this embodiment, an optimization device is also included, which is connected to the monitoring and control device, and is used to optimize the operating parameters of the cold storage device 102 based on the historical monitoring data and prediction model of the temperature sensor.

[0046] In this embodiment, the operating parameters of the cold storage device 102 include: a water temperature adjustment parameter in the water supply pipe 102a, used to adjust the water temperature in the water supply pipe 102a according to the needs of the terminal device 103; a pressure threshold setting parameter for the water supply pipe 102a and the return pipe 102b, used to ensure operation within a safe pressure range; and a flow rate adjustment parameter, used to control the water flow rate through the water supply pipe 102a and the return pipe 102b to adapt to different water temperature requirements.

[0047] In this embodiment, the monitoring and control device further includes: a data unit connected to the control unit, used to collect and analyze data provided by the temperature sensor and the flow controller; a user interface connected to the data unit, used to allow users to view the status of the terminal device 103 and adjust the parameters of the terminal device 103, including but not limited to setting the target water temperature and pressure threshold of the water supply pipe 102a; and can also receive maintenance reminders from the cold energy recovery system 100 and perform remote diagnostics.

[0048] In this embodiment, the monitoring and control device aims to maintain the water temperature in the water supply pipe 102a within a preset range to meet the needs of different indoor temperatures. Specifically, a temperature sensor is installed on the water supply pipe 102a to monitor the water temperature in real time. The temperature sensor sends the monitored water temperature data to the control unit. The control unit receives the data from the temperature sensor and compares it with the preset temperature range. Based on the comparison result, the control unit decides whether to adjust the flow rate of gaseous nitrogen or the opening and closing status of the water supply pipe 102a. If the monitored water temperature deviates from the preset range (e.g., the water temperature is too high or too low), the control unit sends a command to the flow controller, which adjusts the flow rate of gaseous nitrogen according to the command of the control unit. This may involve increasing or decreasing the supply of gaseous nitrogen to change the cooling effect of the cold storage device 102. The control unit can also directly control the opening and closing of the water supply pipe 102a to regulate the water supply. This can be achieved by controlling the valve connected to the water supply pipe 102a, thereby controlling the flow of water. The control unit sends an adjustment command to the temperature control valve, which automatically adjusts the water flow in the water supply pipe 102a according to the command to maintain the water temperature in the water supply pipe 102a within a preset range. The temperature control valve controls the water flow rate by adjusting the valve opening, thereby regulating the water temperature. The temperature sensor continues to monitor the adjusted water temperature and sends the new data to the control unit. The control unit analyzes the data again and makes further adjustments as needed until the water temperature stabilizes within the preset range. The optimization device optimizes the operating parameters of the cold storage device 102 based on the historical monitoring data of the temperature sensor and the predictive model. The optimization device can adjust the flow rate parameters of gaseous nitrogen, the water temperature parameters in the water supply pipe 102a, pressure control parameters, etc., to improve the efficiency and stability of the system; this automated control mechanism improves the system's flexibility and response speed, while also improving energy utilization efficiency.

[0049] In this embodiment, the control unit can be a microcontroller or a programmable logic controller (PLC).

[0050] In this embodiment, the optimization device can be a computer program or a hardware device.

[0051] In this embodiment, the user interface can be a touch screen interface, a computer software interface, a mobile application interface (such as a mobile phone, a tablet computer), etc.

[0052] In this embodiment, a temperature control valve (TV) is a valve used to regulate and control the fluid temperature in a system. Its main function is to maintain a constant temperature within a specified range, regardless of changes in upstream or downstream conditions. If the temperature is higher or lower than the desired set point, the valve will adjust the flow rate of the hot or cold fluid to maintain the required temperature range. In the automatic temperature control system, the valve is controlled by a temperature controller, which receives input from a temperature sensor and adjusts the valve accordingly. That is, based on the temperature requirements of different rooms (e.g., 25°C or 28°C), the water flow in the water supply pipe 102a is automatically adjusted to maintain the water temperature in the water supply pipe 102a within a preset range. The temperature control valve monitors the water temperature in the water supply pipe 102a and automatically adjusts the valve opening according to the preset temperature range, thereby controlling the flow rate through the valve and achieving precise control of the water temperature. In this way, the cold energy recovery system 100 can provide the required temperature conditions for different rooms.

[0053] In this embodiment, the temperature control valve (TV) receives adjustment commands and regulates the water flow in the water supply pipe 102a to maintain the water temperature in the water supply pipe 102a within a preset range. Specifically, the temperature control valve receives adjustment commands from the control unit. These commands are based on the deviation between the actual water temperature in the water supply pipe 102a monitored by the temperature sensor and the preset water temperature. The actuator inside the temperature control valve (such as an electric actuator or a pneumatic actuator) analyzes the received commands to determine the necessary adjustment actions. This may include increasing or decreasing the valve opening. The actuator adjusts the opening of the temperature control valve. If the water temperature in the water supply pipe 102a is higher than the preset range, the actuator will decrease the valve opening, thereby reducing the water flow and lowering the water temperature in the water supply pipe 102a. Conversely, if the water temperature is lower than the preset range, the actuator will increase the valve opening, increasing the water flow and raising the water temperature in the water supply pipe 102a. By adjusting the valve opening, the temperature control valve controls the water flow rate through the water supply pipe 102a. This directly affects the flow rate and temperature of water in the water supply pipe 102a. The temperature control valve continuously adjusts the water flow in the water supply pipe 102a until the water temperature reaches and is maintained within a preset range. This process is dynamic because the water temperature in the water supply pipe 102a may be affected by various factors, such as changes in ambient temperature and system load. The temperature sensor continuously monitors the water temperature in the water supply pipe 102a and feeds the data back to the control unit. The control unit issues the adjustment command again based on the new data, forming a closed-loop control system to ensure that the water temperature remains stable within the preset range, thereby providing suitable low-temperature water to the terminal device 103 (such as an air conditioning unit) and achieving precise control of indoor temperature and humidity. This automated temperature regulation mechanism improves the system's flexibility and response speed, while also improving energy efficiency.

[0054] In this embodiment, the terminal device 103 is an air conditioning unit for regulating indoor temperature and humidity. The air conditioning unit receives low-temperature water from the cold storage device 102 through the water supply pipe 102a and returns the used water to the cold storage device 102 through the return water pipe 102b. The air conditioning unit is connected to the water supply pipe 102a through the water supply interface 103a and to the return water pipe 102b through the return water interface 103b. The water supply interface 103a and the return water interface 103b are connected by a quick-disconnect type. The air conditioning unit also includes an internal water circulation system for cooling and dehumidifying indoor air using low-temperature water; and a power pump for driving the circulation of water between the water supply pipe 102a and the return water pipe 102b.

[0055] In this embodiment, sealing rings are provided at the interfaces (return water interface 103b and supply water interface 103a) to prevent water leakage and ensure the sealing of the connection.

[0056] In this embodiment, a safety monitoring unit (not shown in the figure) connected to the monitoring and control device is also included, which is used to monitor the monitoring and control device and automatically take safety measures when an abnormal situation is detected.

[0057] In this embodiment, the system monitored by the safety monitoring unit is the cold energy recovery system 100. This system includes a vaporization device 101, a cold energy storage device 102, at least one terminal device 103 connected to the cold energy storage device 102, and key components such as a monitoring and control device. The safety monitoring unit is responsible for monitoring various parameters and states of these components in real time and taking corresponding control measures according to preset conditions, such as adjusting valves, starting or stopping equipment. The safety monitoring unit acquires various parameters of the industrial system, such as temperature, pressure, and flow rate, through sensors or other data acquisition devices, and sends the acquired data to the processor in the safety monitoring unit for analysis and processing. Algorithms are typically used to identify abnormal situations or execute specific control logic. Based on the processed data and preset rules, the safety monitoring unit determines whether control measures need to be taken, such as adjusting valves, starting or stopping equipment, and sends alarm information to the operator or executes corresponding control actions to ensure that the cold energy recovery system 100 operates safely and efficiently.

[0058] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A cold recovery system, characterized by, The application relates to a nitrogen cold storage system, comprising: a gasification device for converting liquid nitrogen into gaseous nitrogen; a cold storage device connected to the gasification device for recovering cold energy from the gaseous nitrogen, the cold storage device being provided with a water supply pipe and a water return pipe; at least one terminal device in communication with the cold storage device, the water supply pipe supplying low-temperature water required by the terminal device, and the terminal device returning used water to the cold storage device through the water return pipe; a monitoring and control device connected to the cold storage device and the water supply pipe for monitoring the water temperature of the water supply pipe and controlling the flow of the gaseous nitrogen in the cold storage device; a temperature control valve located on the water supply pipe for automatically adjusting the water flow in the water supply pipe to maintain the water temperature in the water supply pipe within a preset range according to the monitored water temperature of the water supply pipe.

2. The cold recovery system of claim 1, wherein, The monitoring and control device comprises: a temperature sensor mounted on the water supply pipe for monitoring the water temperature in the water supply pipe; a flow controller connected between the gasification device and the cold storage device for adjusting the flow of the gaseous nitrogen according to the monitoring data of the temperature sensor; a control unit connected to the temperature sensor and the flow controller for controlling the opening and closing of the water supply pipe according to the monitoring data of the temperature sensor and sending adjustment instructions to the temperature control valve.

3. The cold recovery system of claim 2, wherein, The temperature control valve is used to receive the adjustment instructions to adjust the water flow in the water supply pipe to maintain the water temperature in the water supply pipe within a preset range.

4. The cold recovery system of claim 2, wherein, The application further comprises an optimization device connected to the monitoring and control device for optimizing the operating parameters of the cold storage device according to historical monitoring data of the temperature sensor and a prediction model.

5. The cold recovery system of claim 4, wherein, The operating parameters of the cold storage device include: adjustment parameters of the water temperature in the water supply pipe for adjusting the water temperature in the water supply pipe according to the requirements of the terminal device; pressure threshold setting parameters of the water supply pipe and the water return pipe for ensuring operation within a safe pressure range; flow adjustment parameters for controlling the water flow rate through the water supply pipe and the water return pipe to adapt to the requirements of different water temperatures.

6. The cold recovery system of claim 2, wherein, The monitoring and control device further comprises: a data unit connected to the control unit for collecting and analyzing data provided by the temperature sensor and the flow controller; a user interface connected to the data unit for allowing a user to view the status of the terminal device and adjust the parameters of the terminal device.

7. The cold recovery system of claim 1, wherein, The terminal device is an air conditioner host for adjusting indoor temperature and humidity, which receives low-temperature water from the cold storage device through the water supply pipe and returns used water to the cold storage device through the water return pipe.

8. The cold recovery system of claim 7, wherein, The air conditioner host is connected to the water supply pipe through a water supply interface, and is connected to the water return pipe through a water return interface, and the water supply interface and the water return interface adopt quick disconnecting connection.

9. The cold recovery system of claim 7, wherein, The air conditioner host further comprises an internal water circulation system for cooling and dehumidifying indoor air by using low-temperature water, and a power pump for driving the circulation of water between the water supply pipe and the water return pipe.

10. The cold recovery system of claim 1, wherein, The gasification device is connected with a liquid nitrogen storage tank.

11. The cold recovery system of claim 1, wherein, The cold storage device is provided with a gas outlet for discharging gaseous nitrogen to a nitrogen use point after recovering the cold in the gaseous nitrogen.

12. The cold recovery system of claim 1, wherein, The monitoring control device is connected with a safety monitoring unit for monitoring the monitoring control device and automatically taking safety measures when an abnormal situation is detected.

13. The cold recovery system of claim 1, wherein, The cold storage device is a cold heat exchanger, and the cold heat exchanger comprises a plurality of parallel heat exchange units.

14. The cold recovery system of claim 1, wherein, The gasification device is a gasifier.

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