Gas dew point generating device for simulation experiment

Abstract

The utility model relates to a gas dew point generating device for a simulation experiment, which is realized by adopting a single-temperature method principle and can realize saturation at a constant temperature after supersaturated gas introduced into a saturator passes through the saturator at the constant temperature so as to obtain a gas dew point temperature corresponding to a required temperature. The heat exchanger adopts a laminated plate group and countercurrent flow heat exchange design, a medium flow channel and a refrigerant coil pipe form a countercurrent layout in a snake shape or a U shape, the heat exchange efficiency is improved by more than 30%, meanwhile, a heater is embedded to realize rapid temperature compensation, the system response time is shortened, and the power of the heater and the rotating speed of a refrigerant compressor are dynamically adjusted in combination with real-time temperature sensor feedback. The temperature fluctuation range in the saturator is smaller than + / -0.05 DEG C, and the calibration precision is remarkably improved. According to the invention, wide-range dew-point temperature adjustment can be realized, and the requirements of industries such as hydrogen fuel cells and high-temperature gas cooled reactors on extreme humidity calibration are met.

Description

Technical Field

[0001] This utility model relates to a gas dew point generating device for simulation experiments. Background Technology

[0002] A gas dew point generator is a device that produces gas with a specific dew point temperature. It is mainly used to simulate, calibrate, or test instruments and systems related to gas humidity. In short, a gas dew point generator is a device that saturates unsaturated or supersaturated gas with water vapor under specific temperature and pressure conditions.

[0003] Dew point temperature refers to the temperature at which a gas, under constant pressure, cools to its saturated state (where water vapor begins to condense into liquid water). Measuring gas dew point is of great significance, widely applied in industries such as manufacturing, environmental monitoring, energy, and medicine. It directly impacts product quality, equipment safety, production efficiency, and environmental protection. This has led to the increasing importance of gas dew point measurement and calibration across various industries, highlighting the crucial role of gas dew point simulation experiments.

[0004] With the increased requirements for dew point measurement this year, higher demands have been placed on gas dew point generators, which typically need to have a wide dew point generation range and high stability. Existing gas dew point generators have a narrow dew point range and their stability needs improvement, which cannot meet the measurement and calibration needs of my country's hydrogen fuel cell, high-temperature gas-cooled reactor, and other industries for extreme humidity environments. Summary of the Invention

[0005] The purpose of this invention is to provide a gas dew point generator for simulation experiments, which can generate saturated moisture over a wide range and with high stability, thereby meeting the humidity simulation requirements of industries such as hydrogen fuel cells and high-temperature gas-cooled reactors, and providing a good experimental environment for accurate measurement and calibration.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This invention provides a gas dew point generating device for simulation experiments, comprising:

[0008] The medium circulation system includes a first expansion tank, a circulation pump, and a medium pipeline. The first expansion tank is connected in series with the circulation pump through the medium pipeline to form a closed loop.

[0009] Refrigerant circulation system, including refrigerant piping;

[0010] A heat exchanger includes a stack of plates, a heater embedded between the stack of plates, and a refrigerant coil passing through the stack of plates, the refrigerant coil being connected to the refrigerant piping of a refrigerant circulation system;

[0011] A temperature control system includes a controller, which is signal-connected to the heater and a temperature sensor;

[0012] The saturator has an internal gas passage and is connected to the medium outlet of the heat exchanger via a medium pipeline;

[0013] A temperature sensor, fixed to the inner wall of the saturator, is used to monitor the temperature of the gas channel in real time.

[0014] The medium circulation system's medium pipeline passes through the stacked plate assembly of the heat exchanger, forming a counter-current heat exchange structure with the refrigerant coil. The controller of the temperature control system dynamically adjusts the heater's power based on the feedback signal from the temperature sensor to maintain the stability of the temperature inside the saturator.

[0015] The temperature control system's controller integrates a PID algorithm, which adjusts the heater's power and the compressor speed of the refrigerant circulation system to achieve a temperature fluctuation range of less than ±0.05℃ within the saturator.

[0016] Optionally, the heat exchanger's stacked plate assembly consists of multiple stacked plates, each stacked plate including several parallel metal plates, with a cavity and flow channel for fixing the heater formed between adjacent metal plates, and a refrigerant flow channel formed between adjacent stacked plates. The heater is an electric heating rod, which is vertically inserted into the gap of the stacked plate assembly.

[0017] Optionally, the refrigerant coil is a serpentine coil or a U-shaped coil arranged horizontally between adjacent stacked plates, and the refrigerant coil is connected to the refrigerant pipeline of the refrigerant circulation system to form a closed loop.

[0018] Optionally, the refrigerant circulation system includes a compressor, a second expansion tank, an expansion valve, an evaporator, and refrigerant piping. The outlet of the compressor is sequentially connected to the second expansion tank, the evaporator, and the expansion valve, and then enters the heat exchanger through the refrigerant piping and is connected to the refrigerant coil to form a closed loop.

[0019] Optionally, the outlet of the evaporator of the refrigerant circulation system is directly connected to one end of the refrigerant coil of the heat exchanger through an expansion valve, and the other end of the refrigerant coil is connected to the inlet of the compressor through an expansion valve.

[0020] Optionally, the first expansion tank of the medium circulation system is equipped with a pressure regulating valve, which is used to stabilize the internal pressure of the medium circulation system, and the outlet of the circulation pump is connected to the medium inlet of the saturator through a branch pipeline.

[0021] Optionally, it also includes a gas pipeline, which includes an input pipeline and an output pipeline, wherein the input pipeline is connected to the gas channel inlet of the saturator and the output pipeline is connected to the gas channel outlet.

[0022] Optionally, both the input and output lines of the gas pipeline are equipped with flow regulating valves, which are connected to the controller of the temperature control system for coordinated control of gas flow and temperature.

[0023] Optionally, the inner wall of the gas channel of the saturator is provided with spiral guide vanes to prolong the gas residence time and promote gas-liquid heat exchange.

[0024] Optionally, the device further includes an insulation layer wrapped around the outer surface of the saturator, heat exchanger, and medium pipeline, the insulation layer being made of vacuum insulation material.

[0025] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0026] This invention discloses a gas dew point generator for simulation experiments. Utilizing a single-temperature method, it allows supersaturated gas introduced into a saturator to reach saturation at a constant temperature, thus obtaining the desired gas dew point temperature. The heat exchanger employs a stacked plate assembly and counter-current heat exchange design. The medium flow channel and refrigerant coil (serpentine or U-shaped) form a counter-current layout, improving heat exchange efficiency by over 30%. Simultaneously, an embedded heater enables rapid temperature compensation, shortening system response time. Combined with real-time temperature sensor feedback, the heater power and refrigerant compressor speed are dynamically adjusted, ensuring that the temperature fluctuation range within the saturator is less than ±0.05℃, significantly improving calibration accuracy. This application achieves a wide dew point temperature adjustment range from -50℃ to 100℃, meeting the extreme humidity calibration requirements of industries such as hydrogen fuel cells and high-temperature gas-cooled reactors. Attached Figure Description

[0027] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0028] Figure 1 This is a schematic diagram of a gas dew point generating device according to an embodiment of the present invention.

[0029] The annotations in the attached figures are explained as follows:

[0030] 1. Medium circulation system; 11. First expansion tank; 12. Circulation pump; 13. Medium pipeline; 14. External circulation pipeline;

[0031] 2. Refrigerant circulation system; 21. Compressor; 22. Second expansion tank; 23. Expansion valve; 24. Evaporator; 25. Refrigerant piping.

[0032] 3. Heat exchanger; 31. Plate stack; 32. Heater; 33. Refrigerant coil;

[0033] 4. Temperature control system; 41. Controller;

[0034] 5. Temperature sensor;

[0035] 6. Gas pipeline; 61. Inlet pipeline; 62. Outlet pipeline; 63. Flow regulating valve;

[0036] 7. Saturator; 71. Gas passage; 72. Spiral guide vane;

[0037] 8. Insulation layer. Detailed Implementation

[0038] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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.

[0040] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0041] This embodiment provides a gas dew point generating device for simulating experiments, which includes:

[0042] The medium circulation system 1 includes a first expansion tank 11, a circulation pump 12 and a medium pipeline 13. The first expansion tank 11 is connected in series with the circulation pump 12 through an external circulation pipeline 14 and the medium pipeline 13 to form a closed loop.

[0043] Refrigerant circulation system 2, including refrigerant piping 25;

[0044] The heat exchanger 3 includes a stack of plates 31, a heater 32 embedded between the stack of plates 31, and a refrigerant coil 33 that passes through the stack of plates 31. The refrigerant coil 33 is connected to the refrigerant pipeline 25 of the refrigerant circulation system.

[0045] Temperature control system 4 includes controller 41, which is signal-connected to heater 32 and temperature sensor 5;

[0046] The saturator 7 has an internal gas passage 71 and is connected to the medium outlet of the heat exchanger 3 through a medium pipeline 13.

[0047] Temperature sensor 5 is fixed to the inner wall of saturator 7 and is used to monitor the temperature of gas channel 71 in real time;

[0048] The medium circulation system's medium pipeline 13 passes through the stacked plate group 31 of the heat exchanger 3, forming a counter-current heat exchange structure with the refrigerant coil 33. The controller 41 of the temperature control system 4 dynamically adjusts the power of the heater 32 according to the feedback signal of the temperature sensor 5 to maintain the stability of the temperature inside the saturator 7.

[0049] The controller 41 of the temperature control system 4 integrates a PID algorithm, which adjusts the power of the heater 32 and the speed of the compressor 21 of the refrigerant circulation system to achieve a temperature fluctuation range of less than ±0.05℃ in the saturator 7.

[0050] In temperature regulation and control, the PID algorithm achieves temperature control through the following steps:

[0051] Temperature measurement: The current temperature is measured in real time using a temperature sensor;

[0052] Error calculation: The set temperature is compared with the actual temperature to obtain the error e(t);

[0053] Calculate the control output: Calculate the control output u(t) based on the PID algorithm, which is used to adjust the power of the heating or cooling equipment;

[0054] Execution control: Adjust the operating status of heating or cooling equipment according to the control output to gradually bring the temperature closer to the set value.

[0055] PID algorithms are widely used in temperature regulation and control due to their simplicity, reliability, and adaptability. Examples include: household appliances such as air conditioners, refrigerators, electric ovens, and water heaters; industrial equipment such as industrial furnaces, reaction vessels, and heat treatment equipment; and laboratory equipment such as incubators and thermostats. By appropriately adjusting the PID parameters, rapid, stable, and precise temperature control can be achieved. This technology is mature, and its application here only requires setting the target temperature and the regulation rate or heating / cooling power to achieve automatic control, without involving any creative program improvements.

[0056] Specifically, in this embodiment, the heat exchanger 3's stacked plate assembly 31 is composed of multiple stacked plates. Each stacked plate includes several parallel metal plates. A cavity and flow channel for fixing a heater 32 are formed between adjacent metal plates. The heater 32 is an electric heating rod, which is vertically inserted into the gap of the stacked plate assembly 31. A refrigerant flow channel is formed between adjacent stacked plates, and the refrigerant coil 33 is arranged in the refrigerant flow channel. The medium flow channel vertically penetrates each stacked plate, and as shown in the figure, the main body of the medium pipeline 13 is perpendicular to the refrigerant coil 33.

[0057] The refrigerant coil 33 is a serpentine coil or a U-shaped coil arranged horizontally between adjacent stacked plates. The refrigerant coil 33 is connected to the refrigerant pipeline 25 of the refrigerant circulation system 2 to form a closed loop.

[0058] The refrigerant circulation system 2 generally includes a compressor 21, a second expansion tank 22, an expansion valve 23, an evaporator 24, and a refrigerant pipeline 25. The outlet of the compressor 21 is connected in sequence to the second expansion tank 22, the evaporator 24, and the expansion valve 23, and enters the heat exchanger 3 through the refrigerant pipeline 25 and is connected to the refrigerant coil 33 to form a closed loop.

[0059] The outlet of the evaporator 24 of the refrigerant circulation system 2 is directly connected to one end of the refrigerant coil 33 of the heat exchanger 3 through the expansion valve 23, and the other end of the refrigerant coil 33 is connected to the inlet of the compressor 21 through the expansion valve 23.

[0060] The first expansion tank 11 of the medium circulation system 1 is equipped with a pressure regulating valve 14, which is used to stabilize the internal pressure of the medium circulation system. The outlet of the circulation pump 12 is connected to the medium inlet of the saturator 7 through a branch pipeline.

[0061] In addition, the gas dew point generating device in this embodiment also includes a gas pipeline 6 for introducing saturated gas into the saturator 7. The gas pipeline 6 includes an input pipeline 61 and an output pipeline 62. The input pipeline 61 is connected to the inlet of the gas channel 71 of the saturator 7, and the output pipeline 62 is connected to the outlet of the gas channel 71.

[0062] Both the input pipe 61 and the output pipe 62 of the gas pipeline 6 are equipped with flow regulating valves 63. The flow regulating valves 63 are connected to the controller 41 of the temperature control system 4 for coordinated control of gas flow and temperature.

[0063] The gas channel 71 of the saturator 7 is provided with a spiral guide vane 72, which is used to prolong the gas residence time and promote gas-liquid heat exchange.

[0064] Optionally, the device further includes an insulation layer 8, which is wrapped around the outer surface of the saturator 7, the heat exchanger 3 and the medium pipeline 13, and the insulation layer 8 is made of vacuum insulation material.

[0065] In summary, the gas dew point generating device for simulation experiments of this invention adopts the single-temperature method, which enables supersaturated gas introduced into the saturator to achieve saturation at that temperature after passing through the saturator at a constant temperature, thereby obtaining the gas dew point temperature corresponding to the desired temperature. The heat exchanger employs a stacked plate assembly and counter-current heat exchange design, with the medium flow channel and refrigerant coil forming a counter-current layout in a serpentine or U-shape, improving heat exchange efficiency by more than 30%. Simultaneously, an embedded heater enables rapid temperature compensation, shortening the system response time. Combined with real-time temperature sensor feedback, the heater power and refrigerant compressor speed are dynamically adjusted, ensuring that the temperature fluctuation range within the saturator is less than ±0.05℃, significantly improving calibration accuracy. This application achieves a wide range of dew point temperature adjustment from -50℃ to 100℃, meeting the extreme humidity calibration needs of industries such as hydrogen fuel cells and high-temperature gas-cooled reactors.

[0066] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A gas dew point generating device for simulation experiments, characterized in that, include: The media circulation system (1) includes a first expansion tank (11), a circulation pump (12) and a media pipeline (13). The first expansion tank (11) is connected in series with the circulation pump (12) through the media pipeline (13) to form a closed loop. The refrigerant circulation system (2) includes refrigerant piping (25); The heat exchanger (3) includes a stack of plates (31), a heater (32) embedded between the stack of plates (31), and a refrigerant coil (33) passing through the stack of plates (31), the refrigerant coil (33) being connected to the refrigerant pipeline (25) of the refrigerant circulation system; The temperature control system (4) includes a controller (41) which is signal-connected to the heater (32) and the temperature sensor (5). The saturator (7) has a gas passage (71) inside and is connected to the medium outlet of the heat exchanger (3) through a medium pipeline (13); Temperature sensor (5) is fixed to the inner wall of saturator (7) for real-time monitoring of the temperature of gas channel (71); The medium pipeline (13) of the medium circulation system passes through the stacked plate group (31) of the heat exchanger (3) and forms a counter-current heat exchange structure with the refrigerant coil (33). The controller (41) of the temperature control system (4) dynamically adjusts the power of the heater (32) according to the feedback signal of the temperature sensor (5) to maintain the stability of the temperature in the saturator (7).

2. The gas dew point generating device according to claim 1, characterized in that, The heat exchanger (3) has a stack of plates (31) consisting of multiple stacks. Each stack includes several parallel metal plates. A cavity and flow channel for fixing the heater (32) are formed between adjacent metal plates. A refrigerant flow channel is formed between adjacent stacks. The heater (32) is an electric heating rod that is vertically inserted into the gap of the stack (31).

3. The gas dew point generating device according to claim 2, characterized in that, The refrigerant coil (33) is a serpentine coil or a U-shaped coil arranged horizontally between adjacent stacked plates. The refrigerant coil (33) is connected to the refrigerant pipeline (25) of the refrigerant circulation system (2) to form a closed loop.

4. The gas dew point generating device according to claim 1, characterized in that, The refrigerant circulation system (2) includes a compressor (21), a second expansion tank (22), an expansion valve (23), an evaporator (24), and a refrigerant pipeline (25). The outlet of the compressor (21) is connected in sequence to the second expansion tank (22), the evaporator (24), and the expansion valve (23), and enters the heat exchanger (3) through the refrigerant pipeline (25) and is connected to the refrigerant coil (33) to form a closed loop.

5. The gas dew point generating device according to claim 4, characterized in that, The outlet of the evaporator (24) of the refrigerant circulation system (2) is directly connected to one end of the refrigerant coil (33) of the heat exchanger (3) through the expansion valve (23), and the other end of the refrigerant coil (33) is connected to the inlet of the compressor (21) through the expansion valve (23).

6. The gas dew point generating device according to claim 1, characterized in that, The first expansion tank (11) of the medium circulation system (1) is equipped with a pressure regulating valve (14), which is used to stabilize the internal pressure of the medium circulation system. The outlet of the circulation pump (12) is connected to the medium inlet of the saturator (7) through a branch pipeline.

7. The gas dew point generating device according to claim 1, characterized in that, It also includes a gas pipeline (6), which includes an input pipeline (61) and an output pipeline (62). The input pipeline (61) is connected to the inlet of the gas channel (71) of the saturator (7), and the output pipeline (62) is connected to the outlet of the gas channel (71).

8. The gas dew point generating device according to claim 7, characterized in that, The gas pipeline (6) has a flow regulating valve (63) installed in both the input pipeline (61) and the output pipeline (62). The flow regulating valve (63) is connected to the controller (41) of the temperature control system (4) for coordinated control of gas flow and temperature.

9. The gas dew point generating apparatus according to any one of claims 1 to 8, characterized in that, The gas channel (71) of the saturator (7) is provided with a spiral guide vane (72) on the inner wall to prolong the gas residence time and promote gas-liquid heat exchange.

10. The gas dew point generating device according to claim 1, characterized in that, The device also includes an insulation layer (8) wrapped around the outer surface of the saturator (7), heat exchanger (3) and medium pipeline (13), and the insulation layer (8) is made of vacuum insulation material.

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