Hot water circulation type carbon dioxide evaporator
By using a hot water circulating carbon dioxide evaporator to replace traditional heating methods with low-temperature hot water, combined with an overflow structure and multi-parameter control, the problems of high energy consumption and safety hazards of traditional evaporators are solved, and an energy-saving and safe carbon dioxide gasification process is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING HENGZHENG ENERGY TECH CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-05-15
AI Technical Summary
Traditional carbon dioxide evaporators are energy-intensive, complex, and difficult to utilize industrial low-temperature waste heat, posing safety hazards and potential equipment failure points.
It adopts a hot water circulation structure, uses low-temperature hot water to replace steam or electric heating, and combines an overflow structure to replace the liquid level gauge. Stable vaporization is achieved through multi-parameter linkage control, increasing the heat exchange area and setting up a safety protection mechanism.
It achieves an energy-saving, safe, and stable carbon dioxide gasification process, reduces equipment failure points, and improves equipment reliability and applicability.
Smart Images
Figure CN224236074U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchange equipment technology, and in particular to a hot water circulating carbon dioxide evaporator. Background Technology
[0002] Traditional carbon dioxide evaporators mostly employ steam-heated or electrically heated water-heated structures, which suffer from high energy consumption, complex equipment, and numerous safety hazards. Steam heating requires a boiler system, resulting in low energy efficiency; electric heating relies on high-grade electricity, leading to significant operating costs. Both types of solutions require level gauges to monitor the water level in the water bath chamber, increasing potential points of failure. Furthermore, traditional evaporators struggle to effectively utilize the low-temperature waste heat resources commonly found in industrial settings, resulting in energy waste.
[0003] In the existing technology, how to utilize industrial waste heat to replace traditional heating methods while simplifying equipment structure, improving safety and energy efficiency has become a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0004] The purpose of this invention is to provide a hot water circulating carbon dioxide evaporator for achieving an energy-saving, safe, and stable carbon dioxide gasification process.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A hot water circulating carbon dioxide evaporator, comprising:
[0007] The evaporator body has a water bath chamber inside, and the evaporator body includes a carbon dioxide coil, which is immersed in the water bath chamber.
[0008] A hot water circulation system includes a hot water inlet located at the bottom of the evaporator body and a hot water outlet located at the top. The hot water inlet is connected to a hot water source, and the hot water outlet is provided with an overflow structure.
[0009] The instrumentation system includes a first temperature transmitter located on the evaporator body, a thermometer and a pressure gauge located at the hot water outlet, and a second temperature transmitter and a pressure transmitter located at the carbon dioxide outlet.
[0010] The safety control system includes a safety valve located on the evaporator body and a pneumatic switch valve located at the carbon dioxide inlet. The pneumatic switch valve is electrically connected to the instrument detection system and controls its opening and closing based on feedback signals from the temperature and pressure of the carbon dioxide outlet and the temperature of the evaporator body.
[0011] Optionally, the hot water circulation system adopts a bottom-in, top-out flow pattern, and the overflow structure of the hot water outlet is used to maintain the liquid level of the water bath cavity.
[0012] Optionally, the control logic of the pneumatic switch valve is as follows: when the temperature of the carbon dioxide outlet is lower than a set threshold, or the pressure of the carbon dioxide outlet is higher than a set threshold, or the temperature of the evaporator body is lower than a set threshold, the pneumatic switch valve will be automatically closed when any of these conditions are triggered.
[0013] Optionally, the evaporator body is provided with a drain outlet at the bottom and a carbon dioxide drain outlet at the top, for discharging residual water and carbon dioxide when the equipment is not in use.
[0014] Optionally, the carbon dioxide coil adopts a spiral winding or tube structure to increase the heat exchange area with the hot water. This configuration increases the contact area with the hot water, improves heat exchange efficiency, and ensures complete vaporization of carbon dioxide.
[0015] Optionally, the opening pressure of the safety valve is set to be 1.1-1.3 times higher than the normal operating pressure to prevent the evaporator from overpressured.
[0016] Optionally, the pressure gauge and thermometer at the hot water outlet are linked to the safety control system to monitor the hot water circulation status in real time and ensure that the carbon dioxide coil is completely submerged in the hot water.
[0017] Compared with existing technologies, the hot water circulating carbon dioxide evaporator provided by this utility model reduces primary energy consumption by using existing low-temperature hot water to replace steam / electric heating, resulting in good energy-saving effect; the overflow structure replaces the level gauge, reducing failure points; multi-parameter linkage control improves vaporization stability and ensures the evaporator has good reliability; the optimized heat exchange structure is suitable for carbon dioxide vaporization needs of different scales, and can be widely used in food, chemical, refrigeration and other fields, with wide applicability. Attached Figure Description
[0018] Figure 1 A schematic diagram of the operation of a hot water circulating carbon dioxide evaporator provided for an embodiment of this utility model;
[0019] Figure 2 A partial structural schematic diagram of a hot water circulating carbon dioxide evaporator provided in an embodiment of this utility model;
[0020] Figure 3 A top view of a hot water circulating carbon dioxide evaporator provided in an embodiment of this utility model.
[0021] Figure label:
[0022] 100-Evaporator; 1-Evaporator body; 11-Water bath chamber; 12-Carbon dioxide coil; 13-Drain outlet; 14-Carbon dioxide drain outlet; 15-Carbon dioxide inlet; 16-Carbon dioxide outlet; 2-Hot water circulation system; 21-Hot water inlet; 22-Hot water outlet; 3-Instrument detection system; 31-First temperature transmitter; 32-Thermometer; 33-Pressure gauge; 34-Second temperature transmitter; 35-Pressure transmitter; 4-Safety control system; 41-Safety valve; 42-Pneumatic switch valve. Detailed Implementation
[0023] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.
[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0028] Please see Figures 1-3 The hot water circulating carbon dioxide evaporator 100 provided in this embodiment of the utility model includes an evaporator body 1, a hot water circulation system 2, an instrument detection system 3, and a safety control system 4. The evaporator body 1 has a water bath chamber 11 inside, and includes a carbon dioxide coil 12 immersed in the water bath chamber 11. The hot water circulation system 2 includes a hot water inlet 21 at the bottom of the evaporator body 1 and a hot water outlet 22 at the top. The hot water inlet 21 is connected to a hot water source, and the hot water outlet 22 has an overflow structure. The instrument detection system 3 includes a first temperature transmitter 31 located on the evaporator body 1, a thermometer 32 and a pressure gauge 33 located at the hot water outlet 22, and a second temperature transmitter 34 and a pressure transmitter 35 located at the carbon dioxide outlet 16. The safety control system 4 includes a safety valve 41 located on the evaporator body 1 and a pneumatic on / off valve located at the carbon dioxide inlet 15. The pneumatic on / off valve 42 is electrically connected to the instrument detection system 3 and controls the opening and closing based on the temperature and pressure feedback signals of the carbon dioxide outlet 16 and the temperature feedback signals of the evaporator body 1.
[0029] Here, the water bath chamber 11 is used to contain hot water and provide heat exchange space for the carbon dioxide coil 12. A constant temperature field is maintained through hot water circulation to ensure that the carbon dioxide coil is always immersed in hot water, thus avoiding dry burning or local overheating.
[0030] In addition, the first temperature transmitter 31 installed on the evaporator body 1 is used to monitor the temperature of the water bath chamber 11, reflecting the heat exchange efficiency of hot water and the heat absorption state of the carbon dioxide coil 12, while the second temperature transmitter 34 installed on the carbon dioxide outlet 16 is used to detect the temperature of the vaporized carbon dioxide, thereby determining whether the carbon dioxide is completely vaporized or overheated, which can serve as a key parameter for controlling the feeding of liquid carbon dioxide.
[0031] The pressure gauge 33 installed at the hot water outlet 22 is used to monitor the hot water circulation pressure, indirectly reflecting the pipeline flow and the stability of the liquid level in the water bath chamber 11. If the pressure is abnormal, such as a sudden drop in pressure, there may be a fault such as pipeline blockage. The pressure transmitter 35 installed at the carbon dioxide outlet 16 is used to monitor the pressure of gaseous carbon dioxide in real time. When the pressure exceeds the set threshold, a safety protection mechanism will be triggered, such as closing the carbon dioxide inlet 15 valve or opening the safety valve 41.
[0032] In this application, the hot water circulation system 2 adopts a bottom-in, top-out flow pattern, thereby ensuring that hot water can completely fill the water bath cavity 11, avoiding air resistance, and effectively improving heat exchange uniformity. The overflow structure of the hot water outlet 22 maintains the liquid level in the water bath cavity 11, thereby eliminating the need for a level gauge.
[0033] In this application, the control logic of the pneumatic switch valve 42 is as follows: when the temperature of the carbon dioxide outlet 16 is lower than the set threshold, or the pressure of the carbon dioxide outlet 16 is higher than the set threshold, or the temperature of the evaporator body 1 is lower than the set threshold, the pneumatic switch valve 42 will be automatically closed when any of these conditions are triggered.
[0034] To facilitate cleaning of the evaporator 100, a drain outlet 13 is provided at the bottom of the evaporator body 1 for draining residual water when the equipment is not in use, which is beneficial for maintenance, cleaning or repair of the evaporator 100. A carbon dioxide drain outlet 14 is provided at the top of the evaporator 100 for draining residual gaseous or liquid carbon dioxide when the equipment is not in use or malfunctions, so as to avoid residual gas from causing safety hazards to maintenance personnel, and at the same time prevent carbon dioxide from condensing inside the cavity to form dry ice and block the pipeline.
[0035] In one embodiment provided in this application, the carbon dioxide coil 12 adopts a spiral winding or tubular structure to increase the heat exchange area with hot water. As the core component for the vaporization of liquid carbon dioxide, the carbon dioxide coil 12 is immersed in the hot water in the water bath chamber 11. It exchanges heat with the hot water through the tube wall, absorbs heat to vaporize the liquid carbon dioxide into a gaseous state, and can be further superheated to the temperature required by the process. The carbon dioxide coil 12 can adopt a spiral winding or tubular structure to increase the contact area with hot water, improve the heat exchange efficiency, and ensure that the carbon dioxide is fully vaporized.
[0036] In this application, the opening pressure of the safety valve 41 is set to be 1.1-1.3 times higher than the normal operating pressure to prevent overpressure in the evaporator 100. The safety valve 41 is located at the top of the evaporator body 1 and automatically opens to release pressure when the internal pressure of the equipment exceeds the set value, preventing overpressure from causing explosions and other safety accidents, and ensuring the safety of equipment and personnel.
[0037] In this application, the pressure gauge 33 and thermometer 32 of the hot water outlet 22 are linked with the safety control system 4 to monitor the hot water circulation status in real time and ensure that the carbon dioxide coil 12 is completely submerged in hot water.
[0038] In specific implementation: During the startup phase, the hot water circulation pump is turned on, and low-temperature hot water enters the evaporator 100 from the hot water inlet 21 at the bottom. After filling the water bath chamber 11, it overflows through the hot water outlet 22 at the top, forming a stable circulation. The system is initialized, and the normal threshold range of each detection parameter is set. After the detection instrument signal is normal, the pneumatic switch valve 42 of the carbon dioxide inlet 15 is opened, and liquid carbon dioxide enters the carbon dioxide coil 12.
[0039] During normal operation, liquid carbon dioxide absorbs heat from the hot water in the carbon dioxide coil 12 and vaporizes into a gaseous state. It is then transported downstream through the carbon dioxide outlet 16. The instrument detection system 3 monitors the temperature and pressure parameters in real time. If the hot water circulation is abnormal (such as flow fluctuations), the system issues an early warning. The pneumatic switch valve 42 dynamically adjusts its opening and closing based on the temperature and pressure data from the carbon dioxide outlet 16 and the temperature data from the evaporator body 1 to ensure that the carbon dioxide is fully vaporized.
[0040] During shutdown maintenance, close the valve of liquid carbon dioxide inlet 15 and the hot water circulation pump; open drain outlet 13 and carbon dioxide drain outlet 14 to discharge residual media; regularly clean carbon dioxide coil 12 and water bath chamber 11, and verify the accuracy of safety valve 41 and other instruments.
[0041] As can be seen from the structure and specific implementation process of the hot water circulating carbon dioxide evaporator 100 described above, by using existing low-temperature hot water to replace steam / electric heating, primary energy consumption is reduced, resulting in good energy-saving effect; the overflow structure replaces the level gauge, reducing failure points; multi-parameter linkage control improves vaporization stability, ensuring that the evaporator 100 has good reliability; the optimized heat exchange structure is suitable for carbon dioxide vaporization needs of different scales, and can be widely used in food, chemical, refrigeration and other fields, with wide applicability.
[0042] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0043] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A hot water circulating carbon dioxide evaporator, characterized in that, include: The evaporator body has a water bath chamber inside, and the evaporator body includes a carbon dioxide coil, which is immersed in the water bath chamber. A hot water circulation system includes a hot water inlet located at the bottom of the evaporator body and a hot water outlet located at the top. The hot water inlet is connected to a hot water source, and the hot water outlet is provided with an overflow structure. The instrumentation system includes a first temperature transmitter located on the evaporator body, a thermometer and a pressure gauge located at the hot water outlet, and a second temperature transmitter and a pressure transmitter located at the carbon dioxide outlet. The safety control system includes a safety valve located on the evaporator body and a pneumatic switch valve located at the carbon dioxide inlet. The pneumatic switch valve is electrically connected to the instrument detection system and controls its opening and closing based on feedback signals from the temperature and pressure of the carbon dioxide outlet and the temperature of the evaporator body.
2. The hot water circulating carbon dioxide evaporator according to claim 1, characterized in that, The hot water circulation system adopts a bottom-in, top-out flow pattern, and the overflow structure of the hot water outlet is used to maintain the liquid level in the water bath cavity.
3. The hot water circulating carbon dioxide evaporator according to claim 1, characterized in that, The control logic of the pneumatic switch valve is as follows: when the temperature of the carbon dioxide outlet is lower than the set threshold, or the pressure of the carbon dioxide outlet is higher than the set threshold, or the temperature of the evaporator body is lower than the set threshold, the pneumatic switch valve will be automatically closed when any of these conditions are triggered.
4. The hot water circulating carbon dioxide evaporator according to claim 1, characterized in that, The evaporator body is provided with a drain outlet at the bottom and a carbon dioxide drain outlet at the top, for discharging residual water and carbon dioxide when the equipment is not in use.
5. The hot water circulating carbon dioxide evaporator according to claim 1, characterized in that, The carbon dioxide coil adopts a spiral winding or tube structure to increase the heat exchange area with hot water.
6. The hot water circulating carbon dioxide evaporator according to claim 1, characterized in that, The opening pressure of the safety valve is set to be 1.1-1.3 times higher than the normal operating pressure to prevent the evaporator from overpressured.
7. The hot water circulating carbon dioxide evaporator according to claim 1, characterized in that, The pressure gauge and thermometer at the hot water outlet are linked to the safety control system to monitor the hot water circulation status in real time and ensure that the carbon dioxide coil is completely submerged in the hot water.