Device and method for measuring specific heat capacity of high-temperature particulate matter

Abstract

The invention relates to a device and method for measuring the specific heat capacity of a high-temperature particulate matter, the device comprises a working medium cavity, a fluid working medium, a temperature measuring element and a steam pipeline, the working medium cavity is provided with a particle inlet, and the particle inlet is used for placing the high-temperature particulate matter in the cavity; the fluid working medium is arranged in the working medium cavity and used for absorbing heat of the high-temperature particulate matter. The temperature measuring element is inserted into the fluid working medium through the working medium cavity and is used for measuring the temperature of the fluid working medium; the working medium cavity is further provided with a steam outlet and a steam reinlet, and the steam pipeline is connected with the steam outlet and the steam reinlet. High-temperature particles to be tested are fed into the working medium cavity and then absorb heat by the fluid working medium, the heat is completely recovered, and the specific heat capacity of the high-temperature particles is calculated according to the temperature rise and physical properties of the fluid working medium. The method is simple and easy to implement, avoids complex links of crushing, grinding, densification tabletting and the like of the high-temperature particulate matter, and is not limited by conditions of different particle sizes, non-uniform distribution, loose characteristics, irregular shapes and the like any more. And tests can be carried out on industrial sites, the measurement time is short, and the test cost is low.

Description

Technical Field

[0001] This invention belongs to the field of waste heat recovery and utilization technology in thermal energy engineering, and specifically relates to a device and method for measuring the specific heat capacity of high-temperature particulate matter. Background Technology

[0002] High-temperature particulate waste heat mainly originates from the production processes of energy-intensive industries such as metallurgy, chemical engineering, and building materials. For example, blast furnace slag in the steel industry and metal particles from metallurgical processes can reach temperatures above 600℃, thus constituting high-temperature waste heat resources. Recovering high-temperature particulate waste heat can significantly reduce energy costs. Currently, the total amount of industrial waste heat resources accounts for approximately 17%-67% of its fuel consumption, with a recovery rate of up to 60%.

[0003] The heat storage capacity of high-temperature particles is the most important input parameter for the design of waste heat recovery equipment, and the specific heat of high-temperature particles is the main physical property parameter for estimating their heat storage capacity. Testing the specific heat capacity of high-temperature particles is a key step in studying their thermal properties, directly affecting the design and efficiency optimization of the waste heat recovery system. However, high-temperature particles generated in industrial processes are characterized by large particle size, uneven distribution, porosity, and irregular particle shape. Existing techniques for testing the specific heat capacity of particles include differential scanning calorimetry (DSC), laser flare calorimetry (LFA), and adiabatic calorimetry, all of which present certain challenges for testing the specific heat of high-temperature particles. For example, DSC is suitable for small particles (micrometer-scale) or powder samples, requiring the particles to be pressed into thin sheets or mixed with inert materials to reduce thermal resistance; LFA is suitable for dense masses, requiring the particles to be uniformly pressed or sintered into thin sheets to ensure a smooth surface; adiabatic calorimetry heats the sample in an adiabatic environment, directly calculating the specific heat capacity by inputting energy and temperature rise, requiring strict control of adiabatic conditions to avoid heat loss. To accurately obtain the specific heat capacity of high-temperature particulate matter, a simpler and more feasible specific heat capacity testing device and method is needed to provide accurate input for the design of waste heat recovery systems. Summary of the Invention

[0004] In order to overcome the above-mentioned problems in the prior art, the present invention provides an apparatus and method for measuring the specific heat capacity of high-temperature particulate matter, thereby solving the above-mentioned problems in the prior art.

[0005] A device for measuring the specific heat capacity of high-temperature particulate matter, the device comprising: a working fluid chamber, a fluid working fluid, a temperature measuring element, and a steam pipeline, wherein a particle inlet is provided on the working fluid chamber for placing high-temperature particulate matter into the chamber; The fluid working medium is placed in the working medium cavity to absorb the heat released by the high-temperature particulate matter; The temperature sensing element is inserted into the working fluid through the working fluid cavity to measure the temperature of the working fluid. The working fluid chamber is also provided with a steam outlet and a steam re-inlet, and the steam pipeline connects the steam outlet and the steam re-inlet.

[0006] In addition to the aspects and any possible implementations described above, a further implementation is provided in which a sealing cap is provided on the particle inlet, and the sealing cap is fastened to the working fluid cavity by a snap fastener.

[0007] In addition to the aspects described above and any possible implementation, a further implementation is provided in which the particle inlet and the steam outlet are respectively located in the upper part of the working fluid cavity, and the temperature sensing element is sealed to the working fluid cavity.

[0008] In addition to the aspects described above and any possible implementation, a further implementation is provided in which the steam re-inlet is disposed on the side wall of the working fluid chamber, and a one-way flow valve is provided at the steam re-inlet location.

[0009] In addition to the aspects described above and any possible implementation, a further implementation is provided in which the device further includes an insulation layer that wraps around the outside of the working fluid cavity and the outside of the steam pipeline.

[0010] The present invention also provides a system for measuring the specific heat capacity of high-temperature particulate matter, the system comprising a temperature recorder and the aforementioned device, wherein the temperature recorder is connected to the temperature measuring element of the device.

[0011] This invention also provides a method for measuring the specific heat capacity of high-temperature particulate matter, the method being implemented using the aforementioned system and comprising the following steps: S1. Determine the appropriate working fluid based on the temperature of the particulate matter to be tested; S2. Load the fluid working medium into the working medium chamber, and connect the temperature measuring element to the temperature recorder to prepare for the test; S3. Place the heated particulate material to be tested into the working fluid chamber through the particle inlet, and then seal the sealing cap at the particle inlet. S4. High-temperature particulate matter releases heat to the fluid working medium, the fluid working medium absorbs heat and rises in temperature, and the generated steam passes through the steam outlet and enters the steam re-inlet through the steam pipeline, opening the one-way flow valve and returning to the interior of the fluid working medium. S5. The entire process is kept warm by the insulation layer, and the temperature sensing element measures the temperature of the fluid working medium in real time, which is recorded and displayed by the temperature recorder; S6. Determine the final stable temperature of the fluid working medium based on the recorded temperature curve.

[0012] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the particle characteristics to be tested are heated in an external heating device to reach a target temperature; and an external force is used to clamp and seal the sealing cap to the working fluid chamber.

[0013] In addition to the aspects and any possible implementations described above, an implementation is further provided in which S1 specifically includes: estimating the specific heat capacity of the particulate matter based on the particulate composition properties of the particulate matter to be tested, thereby estimating the required volume and temperature rise of the working fluid based on the specific heat capacity.

[0014] In addition to the aspects described above and any possible implementation, a further implementation is provided, wherein the method further includes S7. Calculating the specific heat capacity of the particulate matter to be tested using the mass, temperature rise range, and specific heat capacity data of the fluid working medium, as well as the initial temperature and mass of the particulate matter to be tested.

[0015] Beneficial effects of the present invention (1) Under adiabatic conditions, the present invention obtains the specific heat capacity of high-temperature particulate matter by releasing heat to the working medium in the environment through the heat absorption of the working medium. The method is simple and easy to implement. It avoids complex steps such as crushing, grinding, densifying and pressing high-temperature particulate matter into tablets, and is no longer limited by conditions such as different particle sizes, uneven distribution, loose characteristics, and irregular shapes.

[0016] (2) Considering that high-temperature particles release heat rapidly in the working fluid, which may cause phase change, boiling, evaporation, etc., the present invention designs an internal evaporation circulation pipeline for heat recovery, so that all heat is absorbed by the working fluid. The device is strictly insulated externally, and because the temperature rise range of the working fluid is limited, the heat loss to the environment is small.

[0017] (3) By using the working fluid temperature rise and known physical properties, and based on the mass of the high-temperature particles, the heat released during the cooling process of the high-temperature particles is calculated, thereby obtaining their specific heat capacity under high-temperature conditions. The measurement time is short, the temperature range is wide, and the testing cost is low. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the device of the present invention. Detailed Implementation

[0019] To better understand the technical solution of this invention, the content of this invention includes, but is not limited to, the specific embodiments described below. Similar technologies and methods should be considered within the scope of protection of this invention. To make the technical problems to be solved, the technical solutions, and advantages of this invention clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0020] It should be understood that the embodiments described in this invention are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0021] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0022] The present invention provides a device for measuring the specific heat capacity of high-temperature particulate matter. The device includes: a working fluid chamber, a fluid working fluid, a temperature measuring element, and a steam pipeline. The working fluid chamber is provided with a particle inlet for placing high-temperature particulate matter into the chamber. The fluid working medium is placed in the working medium cavity to absorb the heat of the high-temperature particulate matter; The temperature sensing element is inserted into the working fluid through the working fluid cavity to measure the temperature of the working fluid. The working fluid chamber is also provided with a steam outlet and a steam re-inlet, and the steam pipeline connects the steam outlet and the steam re-inlet.

[0023] Furthermore, a sealing cap is provided on the particle inlet, and the sealing cap is fastened to the working fluid cavity by a snap fastener.

[0024] Furthermore, the particle inlet and the steam outlet are respectively located at the upper part of the working fluid cavity, and a perforation is provided between the particle inlet and the steam outlet. The temperature measuring element is installed in the perforation and is sealed to the working fluid cavity.

[0025] Furthermore, the steam re-inlet is located on the side wall of the working fluid chamber, and a one-way flow valve is provided at the steam re-inlet location.

[0026] Furthermore, the device also includes a heat insulation layer that wraps around the outside of the working fluid cavity and the outside of the steam pipeline.

[0027] As an embodiment of the present invention, the present invention also provides a system for measuring the specific heat capacity of high-temperature particulate matter, the system comprising a temperature recorder and the aforementioned device, wherein the temperature recorder is connected to the temperature measuring element of the device.

[0028] Specifically, such as Figure 1As shown, the device for measuring the specific heat capacity of high-temperature particulate matter according to the present invention includes: a working fluid chamber 1 and a fluid working fluid 2; the fluid working fluid 2 is installed inside the working fluid chamber 1; the working fluid chamber 1 is provided with a particle inlet 3, a steam outlet 4, a steam re-inlet 5, a steam pipeline 6, and a temperature measuring element 8; the steam outlet 4 and the steam re-inlet 5 are connected through the steam pipeline 6; a one-way flow valve 7 is provided on the steam re-inlet 5 to prevent the fluid working fluid from being discharged backwards from the steam re-inlet. The steam outlet 4 and the particle inlet 3 are simultaneously located at the upper part of the working fluid chamber 1. At the same time, a temperature measuring element 8 is inserted into the working fluid chamber 1, with a through-hole between the particle inlet 3 and the steam outlet 4. The temperature measuring element 8 is strictly sealed to the working fluid chamber 1 and inserted into the fluid working fluid 2 for measuring the temperature of the fluid working fluid 2.

[0029] Preferably, a sealing cover 9 is provided on the particle inlet 3. The sealing cover 9 is fastened to the working fluid chamber 1 by a snap fastener, and is used to seal the entire working fluid chamber during measurement.

[0030] Preferably, an insulation layer 10 is provided on the outside of the entire device. This insulation layer insulates the working fluid chamber 1 and the steam pipeline 6 to prevent heat loss in the working fluid chamber 1 during measurement and to ensure the accuracy of the measurement results.

[0031] As an embodiment of the present invention, the present invention also provides a method for measuring the specific heat capacity of high-temperature particulate matter, the method being implemented using the aforementioned system and comprising the following steps: S1. Determine the appropriate working fluid based on the temperature of the particulate matter to be tested; S2. Load the fluid working medium into the working medium chamber, and connect the temperature measuring element to the temperature recorder to prepare for the test; S3. The heated particulate material to be tested is placed into the working fluid chamber through the particulate inlet and enters the fluid working fluid; S4. High-temperature particulate matter releases heat to the fluid working medium, the fluid working medium absorbs heat and its temperature rises, and the generated steam exits through the steam outlet and enters the steam re-inlet through the steam pipeline, opening the one-way flow valve and returning to the interior of the fluid working medium. S5. The entire process is kept warm by the insulation layer, and the temperature sensing element measures the temperature of the fluid working medium in real time, which is recorded and displayed by the temperature recorder; S6. Determine the final stable temperature of the fluid working medium based on the temperature curve mentioned in the record.

[0032] Furthermore, the particle characteristics to be tested are heated in an external heating device to reach the target temperature; external force is used to clamp and seal the sealing cap to the working fluid chamber.

[0033] Further, S1 specifically includes: estimating the specific heat capacity of the particulate matter based on the particulate composition properties of the particulate matter to be tested, and then estimating the required volume and temperature rise of the working fluid based on the specific heat capacity.

[0034] Furthermore, the method also includes S7. Calculating the specific heat capacity of the particulate matter to be tested using the mass, temperature rise range, and specific heat capacity data of the working fluid, as well as the initial temperature and mass of the particulate matter to be tested.

[0035] Specifically, the measurement process is as follows: Step 1: Determine the appropriate working fluid 2 based on the temperature of the particulate matter to be tested. Determine the particle size and quantity of the particulate matter to be tested. Estimate the specific heat capacity of the particulate matter based on its composition and properties, and estimate the required volume and temperature rise of the working fluid 2. The temperature rise should ideally be between 5 and 20°C. The type of particulate matter to be tested is not limited; different types of particulate matter should be tested. However, the physical properties of different types of particulate matter can be estimated (e.g., rock, steel slag, coal slag, etc.). Therefore, based on the estimated or predicted properties of different substances, a suitable working fluid (e.g., water, oil, or other cooling fluid) can be selected. The quantity of the working fluid needs to be determined based on the particle quantity, the estimated specific heat, and the required temperature rise of 5-20 degrees Celsius.

[0036] Step 2: Fill the working fluid 2 into the working fluid chamber 1, and connect the temperature measuring element 8 to the external temperature recorder to prepare for the test.

[0037] Step 3: First, heat the particulate matter to be tested to the target temperature in an external heating device. That is, the particulate matter to be tested in this invention has a target temperature before being placed into the working fluid chamber. The heating method used to achieve this target temperature is not limited in this invention. The high-temperature particulate matter to be tested, with the target temperature, is placed into the working fluid chamber 1 through the particle inlet 3, entering the fluid working fluid 2. Simultaneously, the sealing cap 9 is tightened and sealed to the working fluid chamber 1. This seal can be tightened by an external control mechanism; this invention is not limited in its application.

[0038] Step 4: The high-temperature particulate matter to be tested releases heat to the working fluid 2, the working fluid 2 absorbs heat and heats up, and may undergo a local phase change. The generated steam is discharged from the working fluid and enters the steam re-inlet 5 through the steam outlet 4 and the steam pipeline 6, opening the one-way flow valve 7. It then returns to the working fluid 2. Afterwards, the steam undergoes secondary heat exchange and condensation inside the working fluid 2, thereby recovering the heat carried away by the steam.

[0039] Step 5: During the above process, the entire device is kept warm by the insulation layer 10. During the above process, the temperature measuring element 8 measures the temperature of the fluid working medium 2 in real time and records and displays it through the temperature recorder.

[0040] Step 6: Determine the final stable temperature of fluid working medium 2 based on the temperature curve recorded by the temperature recorder. Calculate the specific heat capacity of the particulate material to be tested using the mass, temperature rise range, and specific heat capacity data of fluid working medium 2, as well as the initial temperature and mass of the particulate material to be tested.

[0041] In the formula, Let be the specific heat capacity of the particulate matter to be tested, and be the quantity to be determined. For the mass of the particulate matter to be tested, The initial temperature of the particulate matter to be tested. The final temperature of the particulate matter and fluid working medium to be tested. For the mass of the working fluid, Specific heat of the working fluid. The initial temperature of the working fluid. , and Available before measurement. , It can be obtained from the curve recorded by the recorder.

[0042] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A device for measuring the specific heat capacity of high-temperature particulate matter, characterized in that, The device includes: a working fluid chamber, a fluid working fluid, a temperature measuring element, and a steam pipeline. The working fluid chamber is provided with a particle inlet, which is used to place high-temperature particulate matter into the chamber. The fluid working medium is placed in the working medium cavity to absorb the heat released by the high-temperature particulate matter; The temperature sensing element is inserted into the working fluid through the working fluid cavity to measure the temperature of the working fluid. The working fluid chamber is also provided with a steam outlet and a steam re-inlet, and the steam pipeline connects the steam outlet and the steam re-inlet.

2. The apparatus according to claim 1, characterized in that, A sealing cap is provided on the particle inlet, and the sealing cap is fastened to the working fluid cavity by a snap fastener.

3. The apparatus according to claim 1 or 2, characterized in that, The particle inlet and steam outlet are respectively located at the upper part of the working fluid chamber, and the temperature measuring element is sealed to the working fluid chamber.

4. The apparatus according to claim 1, characterized in that, The steam re-inlet is located on the side wall of the working fluid chamber, and a one-way flow valve is provided at the steam re-inlet location.

5. The apparatus according to claim 3, characterized in that, The device also includes an insulation layer that wraps around the outside of the working fluid cavity and the steam pipeline.

6. A system for measuring the specific heat capacity of high-temperature particulate matter, characterized in that, The system includes a temperature recorder and the device according to any one of claims 1-5, wherein the temperature recorder is connected to the temperature measuring element of the device.

7. A method for measuring the specific heat capacity of high-temperature particulate matter, characterized in that, The method is implemented using the system described in claim 6, and includes the following steps: S1. Determine the appropriate working fluid based on the temperature of the particulate matter to be tested; S2. Load the fluid working medium into the working medium chamber, and connect the temperature measuring element to the temperature recorder to prepare for the test; S3. Place the heated particulate material to be tested into the working fluid chamber through the particle inlet, and then seal the sealing cap at the particle inlet. S4. High-temperature particulate matter releases heat to the fluid working medium, the fluid working medium absorbs heat and rises in temperature, and the generated steam passes through the steam outlet and enters the steam re-inlet through the steam pipeline, opening the one-way flow valve and returning to the interior of the fluid working medium. S5. The entire process is kept warm by the insulation layer, and the temperature sensing element measures the temperature of the fluid working medium in real time, which is recorded and displayed by the temperature recorder; S6. Determine the final stable temperature of the fluid working medium based on the recorded temperature curve.

8. The method according to claim 7, characterized in that, The particle characteristics to be tested are heated in an external heating device to reach the target temperature; the sealing cap is then clamped and sealed to the working fluid chamber by external force.

9. The method according to claim 7, characterized in that, S1 specifically includes: estimating the specific heat capacity of the particulate matter based on the particulate composition properties of the particulate matter to be tested, and then estimating the required volume and temperature rise of the working fluid based on the specific heat capacity.

10. The method according to claim 7, characterized in that, The method further includes S7. Calculating the specific heat capacity of the particulate matter to be tested using the mass, temperature rise range, and specific heat capacity data of the working fluid, as well as the initial temperature and mass of the particulate matter to be tested.

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