A high viscosity, easily solidified fluid flow measurement device and method

Abstract

This invention relates to the field of flow measurement and discloses a device and method for measuring the flow rate of high-viscosity, easily solidified fluids. The device includes: a first pipe for flowing the fluid to be measured; a second pipe sleeved outside the first pipe, forming an annular channel between them for flowing a heat exchange medium; a first temperature sensor and a second temperature sensor respectively disposed at the inlet and outlet of the first pipe; a third temperature sensor and a fourth temperature sensor respectively disposed at the inlet and outlet of the annular channel; a flow meter disposed at the inlet or outlet of the annular channel for detecting the flow rate of the heat exchange medium; and a calculation module electrically connected to the first, second, third, and fourth temperature sensors and the flow meter for calculating the flow rate of the fluid to be measured based on the principle of heat balance. The method is implemented based on the device. The beneficial effect of this invention is that it enables non-contact measurement of high-viscosity, easily solidified fluids.

Description

Technical Field

[0001] This invention relates to the field of flow measurement, and more specifically to a flow measurement device and method for high-viscosity, easily solidified fluids. Background Technology

[0002] In industrial production, accurate measurement of fluid flow rate within pipelines is crucial for process control, energy management, and environmental protection. However, measuring the flow rate of high-viscosity, easily solidified fluids (such as the fluid being measured, syrup, paraffin, asphalt, etc.) has always been a technical challenge in the industry. These fluids typically exhibit poor flowability, readily adhere to the inner walls of pipelines, and easily solidify at low temperatures, making conventional flow measurement methods difficult to apply directly.

[0003] Currently used flow meters, such as differential pressure, volumetric, velocity, electromagnetic, and ultrasonic flow meters, all have significant drawbacks when measuring the aforementioned fluids. For example, differential pressure and volumetric flow meters are prone to clogging due to fluid adhesion and solidification, leading to measurement failure or even sensor damage; electromagnetic flow meters require the fluid to have a certain degree of conductivity, while most high-viscosity organic materials are insulators; the signal of ultrasonic flow meters is easily attenuated by high-viscosity media and has difficulty penetrating. Therefore, existing technologies generally require the flow meter element to be in direct contact with the measured fluid or rely on the specific physical properties of the fluid, making it difficult to achieve accurate and stable measurement of the flow rate of high-viscosity, easily solidifying fluids without direct contact. Summary of the Invention

[0004] To address the aforementioned technical problems, the aim is to provide a flow measurement device and method for high-viscosity, easily solidified fluids, enabling non-contact measurement of high-viscosity, easily solidified fluids and eliminating the dependence of traditional flow meters on specific physical properties such as fluid conductivity or ultrasonic penetration.

[0005] This invention is achieved through the following technical solution:

[0006] A flow measurement device for high-viscosity, easily solidified fluids includes a first pipe, a second pipe, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a flow meter, and a calculation module. The first pipe is used to flow the fluid to be measured. The second pipe is sleeved outside the first pipe, forming an annular channel with the first pipe, for flowing a heat exchange medium. The first and second temperature sensors are respectively located at the inlet and outlet of the first pipe. The third and fourth temperature sensors are respectively located at the inlet and outlet of the annular channel. The flow meter is located at the inlet or outlet of the annular channel and is used to detect the flow rate of the heat exchange medium. The calculation module is electrically connected to the first, second, third, and fourth temperature sensors and the flow meter, and is used to calculate the flow rate of the fluid to be measured based on the principle of heat balance.

[0007] The beneficial effects of this invention are as follows: By employing a nested first and second pipe structure, the measured fluid and the heat exchange medium are completely isolated in physical space, avoiding direct contact between any flow measurement element and the measured fluid. This solves the problem of high-viscosity, easily solidified fluids easily adhering to sensors or clogging flow channels. By setting a first temperature sensor and a second temperature sensor at the inlet and outlet of the first pipe, and a third temperature sensor and a fourth temperature sensor at the inlet and outlet of the annular channel, respectively, the system can obtain complete information about the heat exchange process simply by measuring the temperature changes of the fluids inside and outside the pipes without contacting the measured fluid. By setting a flow meter at the inlet or outlet of the annular channel to detect the flow rate of the heat exchange medium, the measurement challenge is shifted from high-viscosity fluids that are difficult to measure directly to clean heat exchange media that are easy to measure. Finally, the calculation module indirectly calculates the flow rate of the measured fluid based on the temperature and flow data acquired through the non-contact method, according to the principle of heat balance. This achieves non-contact soft measurement of high-viscosity, easily solidified fluids, completely eliminating the dependence of traditional flow meters on specific physical properties such as fluid conductivity or ultrasonic penetration.

[0008] In some real-time flow measurements, the first and second pipes are arranged coaxially or coiled on the outside of the first pipe. This coaxial arrangement of the first and second pipes, or the coiled structure on the outside of the first pipe, ensures that the cross-sectional area of ​​the annular channel is uniform along the flow path, guaranteeing a uniform distribution of the heat exchange medium velocity. This makes the heat exchange process stable and controllable, improving measurement accuracy and repeatability.

[0009] In some real-time flow measurements, the second pipe is externally covered with an insulation layer. This insulation layer reduces heat exchange between the heat exchange medium and the external environment, minimizing heat loss and ensuring more thorough and stable heat exchange between the heat exchange medium and the fluid being measured inside the pipe, thereby improving the accuracy of heat balance calculations.

[0010] In some real-time flow measurements, a temperature controller is also included. This temperature controller is electrically connected to the calculation module and the heat exchange medium supply system. It is used to adjust the inlet temperature of the heat exchange medium according to the freezing point of the fluid being measured, ensuring that the pipe wall temperature of the first pipe is always higher than the freezing point of the fluid. By setting up a temperature controller and electrically connecting it to the calculation module and the heat exchange medium supply system, the inlet temperature of the heat exchange medium is actively adjusted according to the freezing point of the fluid being measured. This ensures that the pipe wall temperature of the first pipe is always higher than the freezing point of the fluid being measured, preventing the fluid from solidifying and clogging due to temperature drop as it flows through the measuring pipe section, thus guaranteeing the continuity and stability of the measurement process.

[0011] In some real-time flow scenarios, the heat exchange medium is steam or hot water. The specific selection of steam or hot water as the heat exchange medium, due to their high specific heat capacity and stable thermal properties, provides sufficient and controllable heat for high-viscosity, easily solidifying fluids, further enhancing the anti-condensation effect, while also being readily available and usable in industrial settings.

[0012] In some real-time flow measurements, the calculation module further includes an input interface for receiving the composition information of the fluid being measured and retrieving the corresponding specific heat capacity and density from a pre-set physical property database based on this information. By adding an input interface to the calculation module to receive the composition information of the fluid being measured and retrieve the corresponding specific heat capacity and density from the pre-set physical property database based on this information, the system can automatically match accurate physical property parameters, avoiding calculation errors caused by deviations in physical property parameters, thereby improving measurement accuracy.

[0013] This invention also provides a method for measuring the flow rate of high-viscosity, easily solidified fluids. Using the aforementioned high-viscosity, easily solidified fluid flow rate measuring device, the method includes the following steps: the fluid to be measured flows through a first pipe, while a heat exchange medium flows through an annular channel; the inlet and outlet temperatures of the fluid to be measured and the inlet and outlet temperatures of the heat exchange medium are acquired using corresponding temperature sensors, and the flow rate of the heat exchange medium is acquired using a flow meter; based on the heat balance equation, the flow rate of the fluid to be measured is calculated using the inlet and outlet temperature differences of the fluid to be measured, the inlet and outlet temperature differences of the heat exchange medium, and the flow rate of the heat exchange medium. By allowing the fluid to be measured to flow through the first pipe and the heat exchange medium to flow through the annular channel, simultaneously acquiring the inlet and outlet temperatures of the fluid to be measured and the inlet and outlet temperatures of the heat exchange medium, and then calculating the flow rate of the fluid to be measured based on the heat balance equation, an indirect, non-contact measurement of the flow rate of high-viscosity, easily solidified fluids is achieved, completely avoiding the limitations of traditional flow meters that directly contact or rely on specific physical properties of the fluid.

[0014] In some real-time flow scenarios, the heat balance equation is:

[0015] ;in, The flow rate of the fluid being measured. The specific heat capacity of the fluid being measured. The density of the fluid being measured. It is the absolute value of the difference between the inlet temperature and the outlet temperature of the fluid being measured; The flow rate of the heat exchange medium. The specific heat capacity of the heat exchange medium. The density of the heat exchange medium, The density of the heat exchange medium, This represents the absolute value of the difference between the outlet and inlet temperatures of the heat exchange medium. The heat balance equation mathematically corresponds precisely to the physical direction of heat transfer—the heat released by the measured fluid equals the heat absorbed by the heat exchange medium—thus ensuring the correctness and consistency of the calculation logic and providing an accurate mathematical model basis for indirectly measuring the flow rate of high-viscosity, easily solidifying fluids based on the principle of heat balance.

[0016] In some real-time flow rates, the specific heat capacity of the fluid being measured and the density of the fluid being measured This value is dynamically corrected based on the real-time temperature of the fluid being measured. This is because the specific heat capacity of the fluid is dynamically adjusted according to its real-time temperature during the measurement process. and density The value of is determined to eliminate the influence of temperature changes on physical property parameters, so that the physical property parameters in the heat balance equation always match the current operating conditions, thereby improving measurement accuracy. This is especially suitable for industrial sites with large temperature fluctuations.

[0017] Some real-time flow measurements also include adjusting the inlet temperature of the heat exchange medium based on the freezing point of the fluid being measured, ensuring that the inner wall temperature of the first pipe is always higher than the freezing point of the fluid. By introducing the step of adjusting the inlet temperature of the heat exchange medium according to the freezing point of the fluid into the measurement method, the process control level ensures that the inner wall temperature of the first pipe is always higher than the freezing point of the fluid, achieving active anti-freezing protection for easily solidified fluids and guaranteeing the long-term stable operation of the measuring device.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. Due to the use of a nested first and second pipe structure, the fluid being measured is completely isolated from the heat exchange medium in physical space, avoiding direct contact between any flow measurement element and the fluid being measured, thereby solving the problem that high-viscosity, easily solidified fluids are prone to adhering to the sensor or clogging the flow channel.

[0020] 2. By installing a first temperature sensor and a second temperature sensor at the inlet and outlet of the first pipe, and a third temperature sensor and a fourth temperature sensor at the inlet and outlet of the annular channel, respectively, the system can obtain complete information about the heat exchange process simply by measuring the temperature changes of the fluids inside and outside the pipes without contacting the fluid being measured. By installing a flow meter at the inlet or outlet of the annular channel to detect the flow rate of the heat exchange medium, the measurement challenge is shifted from high-viscosity fluids that are difficult to measure directly to clean heat exchange media that are easy to measure. Finally, the calculation module indirectly calculates the flow rate of the fluid being measured based on the temperature and flow data acquired by the above non-contact method according to the principle of heat balance. This achieves non-contact soft measurement of high-viscosity, easily solidified fluids, completely eliminating the dependence of traditional flow meters on specific physical properties such as fluid conductivity or ultrasonic penetration.

[0021] 3. By setting a temperature controller and electrically connecting it to the calculation module and the heat exchange medium supply system, the inlet temperature of the heat exchange medium is actively adjusted according to the freezing point of the fluid being measured. This ensures that the temperature of the first pipe wall is always higher than the freezing point of the fluid being measured, preventing the fluid being measured from solidifying and blocking due to temperature drop when flowing through the measuring pipe section, thus ensuring the continuity and stability of the measurement process. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a logic flowchart of the present invention.

[0025] The attached diagram shows the markings and corresponding component names:

[0026] First pipe 10, second pipe 20, first temperature sensor 11, second temperature sensor 12, third temperature sensor 21, fourth temperature sensor 22, flow meter 25, insulation layer 30. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0028] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In the description of this invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" 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 invention 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 limiting the scope of protection of this invention.

[0030] The terms "first," "second," etc., used in this invention are merely for clarity of description and are not intended to limit any order or emphasize importance. Furthermore, the term "connection" as used herein, unless otherwise specified, can refer to a direct connection or an indirect connection via other components.

[0031] Example 1

[0032] like Figures 1-2 As shown in the figure, this embodiment 1 provides a flow measurement device for high-viscosity, easily solidified fluids, including a first pipe 10, a second pipe 20, a first temperature sensor 11, a second temperature sensor 12, a third temperature sensor 21, a fourth temperature sensor 22, and a flow meter 25. The first pipe 10 is used to flow the fluid to be measured; the second pipe 20 is sleeved outside the first pipe 10, forming an annular channel with the first pipe 10, and is used to flow the heat exchange medium; the first temperature sensor 11 and the second temperature sensor 12 are respectively disposed at the inlet and outlet of the first pipe 10; the third temperature sensor 21 and the fourth temperature sensor 22 are respectively disposed at the inlet and outlet of the annular channel; the flow meter 25 is disposed at the inlet or outlet of the annular channel and is used to detect the flow rate of the heat exchange medium; a calculation module is electrically connected to the first temperature sensor 11, the second temperature sensor 12, the third temperature sensor 21, the fourth temperature sensor 22, and the flow meter 25, and is used to calculate the flow rate of the fluid to be measured based on the principle of heat balance.

[0033] Specifically, the first pipe 10 (inner pipe) is made of DN50 stainless steel and is used to flow the fluid being measured; the second pipe 20 (outer pipe) is made of DN100 stainless steel and is coaxially sleeved around the first pipe 10, forming an annular channel between them for the flow of the heat exchange medium (hot water). The second pipe 20 is covered with a 50mm thick rock wool insulation layer 30 or other industrial insulation layer 30 to reduce heat loss.

[0034] A first temperature sensor 11 (Pt100 RTD) is installed at the inlet of the first pipe 10 to detect the inlet temperature of the fluid being measured; a second temperature sensor 12 (Pt100 RTD) is installed at the outlet of the first pipe 10 to detect the outlet temperature of the fluid being measured. A third temperature sensor 21 (Pt100 RTD) is installed at the inlet of the second pipe 20 to detect the inlet temperature of the hot water; a fourth temperature sensor 22 (Pt100 RTD) is installed at the outlet of the second pipe 20 to detect the outlet temperature of the hot water. A flow meter 25 (electromagnetic flow meter 25) is installed at the inlet of the second pipe 20 to detect the volumetric flow rate of the hot water.

[0035] To further improve the reliability of anti-freezing control, one or more wall temperature sensors can be installed on the outer wall of the first pipe 10. The temperature controller simultaneously references the fluid temperature and the wall temperature. When the wall temperature approaches the freezing point, it prioritizes adjusting the temperature of the heat exchange medium to prevent localized freezing due to heat exchange lag. Furthermore, corresponding distributors are added before the first temperature sensor 11, the second temperature sensor 12, the third temperature sensor 21, and the fourth temperature sensor 22 to prevent uneven temperature distribution at the temperature sensors.

[0036] The device is also equipped with a temperature controller, which is electrically connected to the calculation module and the hot water supply system. The temperature controller automatically adjusts the hot water inlet temperature based on the freezing point of the fluid being measured, ensuring that the pipe wall temperature of the first pipe 10 is always higher than the freezing point of the fluid being measured, preventing the fluid from freezing during the measurement process. The calculation module uses an industrial PLC and has a built-in physical property parameter database. This database stores the functional relationship between the specific heat capacity and density of the fluid being measured and temperature (pre-calibrated through laboratory testing), as well as a table of water physical property parameters. The calculation module also has an input interface for receiving the composition information of the fluid being measured (such as water content, components, etc.) input by the operator, and retrieves the corresponding basic physical property parameters from the database based on the composition information. The physical property parameter database built into the calculation module stores the specific heat capacity of the fluid being measured. and density The functional relationship between temperature and physical properties is established, pre-calibrated through laboratory tests or stored in tabular form at multiple temperature points. During measurement, the calculation module uses the real-time acquired inlet temperature of the fluid being measured. and outlet temperature Calculate the current average temperature Then, by linear interpolation or by directly calling the function relationship, the specific heat capacity corresponding to the current average temperature is dynamically obtained. and density These values ​​are used as the inputs to the heat balance equation. As the temperature changes, the physical properties are dynamically updated, enabling real-time dynamic correction.

[0037] Specifically, a flow regulating valve and a flow controller for Q2 are also provided to stabilize the Q2 flow rate and ensure the instantaneous heat exchange of Q2. Stablize.

[0038] This device is essentially an application of soft measurement technology. Soft measurement refers to establishing a mathematical model by measuring easily obtainable auxiliary variables (in this case, the flow rate and inlet / outlet temperature of the heat exchange medium, and the inlet / outlet temperature of the fluid being measured) to indirectly calculate the dominant variables that are difficult to measure directly (in this case, the flow rate of high-viscosity, easily solidifying fluids). By shifting the measurement challenge from directly contacting high-viscosity fluids to measuring the conventional parameters of clean heat exchange media, it overcomes the measurement blind spots of traditional flowmeters.

[0039] Example 2

[0040] See Figure 2 This embodiment 2 provides a method for measuring the flow rate of a high-viscosity, easily solidified fluid, using the aforementioned high-viscosity, easily solidified fluid flow rate measuring device, including the following steps: allowing the fluid to be measured to flow through the first pipe 10, while simultaneously allowing the heat exchange medium to flow through the annular channel; acquiring the inlet and outlet temperatures of the fluid to be measured and the inlet and outlet temperatures of the heat exchange medium respectively through corresponding temperature sensors, and acquiring the flow rate of the heat exchange medium through the flow meter 25; calculating the flow rate of the fluid to be measured based on the heat balance equation, the inlet and outlet temperature difference of the fluid to be measured, the inlet and outlet temperature difference of the heat exchange medium, and the flow rate of the heat exchange medium.

[0041] High-temperature process fluid cooling scenarios:

[0042] The detailed measurement method and steps for flow rate measurement in a cooling scenario after the fluid under test is as follows:

[0043] S1. System Start-up and Stabilization: Open the test fluid delivery pipeline (first pipeline 10) and adjust the test fluid flow rate to the normal operating value. Simultaneously, start the cooling water circulation system (heat exchange medium system flowing within the second pipeline 20), and maintain the cooling water inlet temperature at a stable 45.0°C using the temperature controller. The system ran continuously for 20 minutes until all temperature readings stabilized, indicating that heat exchange had reached equilibrium. The temperature of the fluid being measured after concentration was approximately... It needs to be cooled to Then it enters the packaging process.

[0044] S2. The data acquisition instrument synchronously records a set of stabilized data:

[0045] Inlet temperature of the fluid being measured ;

[0046] The outlet temperature of the fluid being measured ;

[0047] Cold water inlet temperature (Maintained constant temperature by a temperature controller);

[0048] Cold water outlet temperature ;

[0049] Cold water volume flow rate ;

[0050] S3, Parameter Calculation:

[0051] Calculate the temperature drop of the fluid being measured: ;

[0052] Calculate the increase in cold water temperature: ;

[0053] Dynamically correct physical property parameters:

[0054] Calculate the current average temperature of the fluid being measured. ;

[0055] The calculation module is based on Retrieve the corresponding property value from the built-in property database:

[0056] 61.75 was obtained through linear interpolation. density below (The database pre-stores density values ​​at multiple temperature points; this is the interpolation result.)

[0057] The specific heat capacity at 61.75°C was obtained by linear interpolation. ;

[0058] The physical properties of cold water are based on its average temperature. Sure;

[0059] The density of the cold water (heat exchange medium) is determined based on its average temperature of 48.9℃. (Determined based on its average temperature of 48.9℃);

[0060] Specific heat capacity of cold water ;

[0061] Step S4: Solve the heat balance equation:

[0062] According to the law of conservation of energy, neglecting heat loss, the heat released by the fluid being measured is equal to the heat absorbed by the cold water:

[0063] ;

[0064] in, Let be the volumetric flow rate of the fluid to be measured.

[0065] Substitute the data into the equation:

[0066] Therefore, the flow rate of the fluid being measured is:

[0067] ;

[0068] Step S5: Result Output: The thermodynamic calculation module will output the calculated results. The values, along with the original temperature and flow data, are displayed on the human-machine interface or transmitted to the upper management system via a communication interface.

[0069] Step S6: Repeat steps S2-S6 to continuously measure the flow rate of the fluid being measured.

[0070] Heating scenarios for easily solidified fluids:

[0071] Taking the measurement of the flow rate of molten asphalt as an example, the detailed measurement method and steps are as follows:

[0072] S1. System Start-up and Stabilization: Turn on the industrial fluid pipeline under test (first pipeline) and the jacketed hot water circuit (second pipeline). Adjust the hot water flow rate to a stable value and maintain the system running for a sufficient time until all temperature readings remain stable, indicating that heat exchange has reached equilibrium. The temperature controller is based on the asphalt's freezing point. Set the inlet temperature of the heat transfer oil. Ensure pipe wall temperature The heat exchange medium is either heat transfer oil or steam.

[0073] S2. The data acquisition instrument synchronously records a set of stabilized data:

[0074] Asphalt inlet temperature ;

[0075] Asphalt outlet temperature ;

[0076] Heat transfer oil inlet temperature (Maintained constant temperature by a temperature controller);

[0077] Heat transfer oil outlet temperature ;

[0078] Heat transfer oil flow rate ;

[0079] S3, Parameter Calculation:

[0080] Calculate the temperature rise of the fluid being measured: ;

[0081] Calculate the temperature drop of the heat transfer oil: ;

[0082] Dynamically correct physical property parameters:

[0083] Calculate the current average temperature of the asphalt: ;

[0084] The calculation module is based on Retrieve the corresponding property value from the built-in property database:

[0085] Density of asphalt at 77.5°C ;

[0086] Specific heat capacity of asphalt at 77.5°C ;

[0087] The physical properties of heat transfer oil are based on its average temperature. Sure:

[0088] Heat transfer oil density ;

[0089] Specific heat capacity of heat transfer oil .

[0090] Step S4: Solve the heat balance equation:

[0091] According to the law of conservation of energy, neglecting heat loss, the heat absorbed by the fluid being measured is equal to the heat released by the heat transfer oil:

[0092] ;

[0093] in, Let be the volumetric flow rate of the molten asphalt to be determined.

[0094] Substitute the data into the equation:

[0095] Therefore, the flow rate of the molten asphalt is:

[0096] ;

[0097] Step S5: Result Output: The thermodynamic calculation module will output the calculated results. The values, along with the original temperature and flow data, are displayed on the human-machine interface or transmitted to the upper management system via a communication interface.

[0098] Step S6: Repeat steps S2-S6 to continuously measure the flow rate of the fluid being measured.

[0099] As a preferred solution, a heat loss correction factor can be introduced to improve measurement accuracy. In practical applications, although the second pipe is covered with an insulation layer, a small amount of heat loss may still occur. This can be corrected in the following ways:

[0100] Before putting the device into operation, the pipeline of the fluid being measured is shut off, and the heat exchange medium is circulated at different flow rates and temperatures. The relationship between the inlet and outlet temperature difference of the heat exchange medium and the actual heat loss is measured, and a heat loss correction function is established. .

[0101] The revised heat balance equation:

[0102] ;

[0103] Alternatively, the heat loss can be converted into an equivalent temperature difference to correct for the loss. The value of .

[0104] Specifically, to prevent measurement failure due to fluctuations in operating conditions, the temperature controller can also be set with a temperature difference threshold protection. When or Below a preset threshold (e.g., 2) When the signal-to-noise ratio decreases, it indicates that the heat exchange is insufficient and the measurement signal-to-noise ratio decreases. At this time, the calculation module will issue an alarm or automatically adjust the flow rate of the heat exchange medium to increase the temperature difference.

[0105] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flow rate measuring device for high-viscosity, easily solidified fluids, characterized in that, include: The first conduit is used to circulate the fluid being measured. The second pipe is fitted outside the first pipe, forming an annular channel between them for the flow of heat exchange medium. The first temperature sensor and the second temperature sensor are respectively installed at the inlet and outlet of the first pipe; The third and fourth temperature sensors are respectively located at the inlet and outlet of the annular channel; A flow meter, installed at the inlet or outlet of the annular channel, is used to detect the flow rate of the heat exchange medium; The calculation module is electrically connected to the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor and the flow meter, and is used to calculate the flow rate of the fluid being measured based on the principle of thermal balance.

2. The high-viscosity, easily solidified fluid flow measurement device according to claim 1, characterized in that, The first and second pipes are arranged coaxially or coiled on the outside of the first pipe.

3. The flow measurement device for high-viscosity, easily solidified fluids according to claim 1, characterized in that, The second pipe is covered with an insulation layer.

4. The flow measurement device for high-viscosity, easily solidified fluids according to claim 1, characterized in that, It also includes a temperature controller, which is electrically connected to the calculation module and the heat exchange medium supply system. The temperature controller is used to adjust the inlet temperature of the heat exchange medium according to the freezing point of the fluid being measured, so that the pipe wall temperature of the first pipe is always higher than the freezing point of the fluid being measured.

5. The flow measurement device for high-viscosity, easily solidified fluids according to claim 1, characterized in that, The heat exchange medium is steam, hot water, or heat transfer oil.

6. The flow measurement device for high-viscosity, easily solidified fluids according to claim 1, characterized in that, The calculation module also includes an input interface, which is used to receive the composition information of the fluid being measured and retrieve the corresponding specific heat capacity and density from a preset physical property database based on the composition information.

7. A method for measuring the flow rate of a high-viscosity, easily solidified fluid, using the apparatus described in any one of claims 1 to 6, characterized in that, Includes the following steps: The fluid being measured flows through the first pipe, while the heat exchange medium flows through the annular channel. The inlet and outlet temperatures of the fluid being measured and the inlet and outlet temperatures of the heat exchange medium are obtained by corresponding temperature sensors, and the flow rate of the heat exchange medium is obtained by a flow meter. Based on the heat balance equation, the flow rate of the fluid being measured is calculated using the inlet and outlet temperature difference of the fluid being measured, the inlet and outlet temperature difference of the heat exchange medium, and the flow rate of the heat exchange medium.

8. The method for measuring the flow rate of high-viscosity, easily solidified fluids according to claim 7, characterized in that, The heat balance equation is: ； in, The flow rate of the fluid being measured. The specific heat capacity of the fluid being measured. The density of the fluid being measured. It is the absolute value of the difference between the inlet temperature and the outlet temperature of the fluid being measured; The flow rate of the heat exchange medium. The specific heat capacity of the heat exchange medium. The density of the heat exchange medium, The density of the heat exchange medium, It is the absolute value of the difference between the outlet temperature and the inlet temperature of the heat exchange medium.

9. The method for measuring the flow rate of high-viscosity, easily solidified fluids according to claim 8, characterized in that, The specific heat capacity of the fluid being measured and the density of the fluid being measured It is a value that is dynamically corrected based on the real-time temperature of the fluid being measured.

10. The method for measuring the flow rate of high-viscosity, easily solidified fluids according to claim 7, characterized in that, It also includes adjusting the inlet temperature of the heat exchange medium according to the freezing point of the fluid being measured, so that the temperature of the inner wall of the first pipe is always higher than the freezing point of the fluid being measured.

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