Experimental device for testing radiant heat absorption performance of coating

Abstract

The utility model discloses an experimental device for testing radiant heat absorption performance of a coating. The experimental device comprises a bracket (1), a metal container (2), a heater (3) and a thermocouple (4), the support (1) is provided with a base (11), a vertical rod (12), a first transverse rod (13) and a second transverse rod (14). The metal container (2) is hung on the second cross rod (14), the outer surface of the bottom of the metal container (2) is used for preparing a coating (7) to be tested, and the container is used for containing heat conduction oil (6). And the heater (3) is arranged below the metal container (2). And one end of the thermocouple (4) is hung on the first cross rod (13), and the other end of the thermocouple (4) extends into the heat conduction oil (6) of the metal container (2). Wherein the supports (1), the metal containers (2) and the thermocouples (4) are arranged in two groups in bilateral symmetry. The experimental device fits the working condition environment, tests the heat absorption performance of different coatings in the form of radiant heat, and plays a key role in energy-saving coating formula design.

Description

Technical Field

[0001] The utility model belongs to the technical field of coating performance testing, and in particular relates to an experimental device for testing the radiant heat absorption performance of a coating. Background Art

[0002] High energy consumption devices such as process heating furnaces, heating boilers and power boilers absorb the radiant heat released by fuel combustion and use the heat energy to heat oil, thermal oil, water and other media. Under high temperature, the surface emissivity of metal substrates such as furnace tubes, boiler furnaces and boiler water-cooled walls is only about 0.7, and the ability to absorb radiant heat is poor. If the heat is discharged with the flue gas, it will cause huge waste. Adding a waste heat recovery device can recover part of the heat energy, but the overall cost of the device will increase significantly. The most efficient way to use heat energy is to heat the medium, so it is necessary to increase the emissivity of the surface of the heated substrate such as metal furnace tubes, furnaces or water-cooled walls to improve their ability to absorb radiant heat.

[0003] The use of energy-saving coatings can increase the emissivity of the substrate surface. The emissivity of energy-saving coatings varies with the raw material formula. Energy-saving coatings with high emissivity can increase the emissivity of the substrate surface to above 0.9. The higher the emissivity, the stronger the material's ability to absorb radiant heat. Although a black meter can test the blackness (blackness = emissivity), the ultimate goal of using energy-saving coatings on heated substrates is to increase the ability of the substrate surface to absorb radiant heat, so a simulation device that is more in line with the actual working conditions of the device should be used for experimental testing. Utility Model Content

[0004] The purpose of the utility model is to provide an experimental device for testing the radiant heat absorption performance of a coating, which can be used to test the radiant heat absorption ability of energy-saving coatings with different emissivity under actual working conditions of a laboratory simulation device, improve the research and development accuracy of energy-saving coatings, and improve the level of energy conservation and emission reduction.

[0005] An experimental device for testing the radiant heat absorption performance of a coating according to the utility model comprises:

[0006] The bracket comprises a base, a vertical rod, a first cross rod and a second cross rod; the vertical rod is arranged on the base, one end of the first cross rod and the second cross rod are connected to the vertical rod, and the first cross rod is arranged above the second cross rod;

[0007] A metal container is suspended on the second crossbar; the outer surface of the bottom is used to prepare the coating to be tested, and the container is used to hold the heat transfer oil;

[0008] a heater disposed below the metal container; and

[0009] A thermocouple, one end of which is suspended on the first crossbar and the other end of which extends into the heat transfer oil in the metal container;

[0010] The bracket, the metal container and the thermocouple are arranged in two groups which are symmetrical on the left and right, and the heater is arranged directly below the two metal containers on the left and right.

[0011] In a specific case, the first cross bar and the second cross bar are movably mounted on the vertical bar, and scale lines are provided in the height direction of the vertical bar, so that the heights of the first cross bar and the second cross bar can be adjusted as needed.

[0012] In a specific case, a thread is provided at the lower end of the vertical rod, and the vertical rod is connected to the base through the thread.

[0013] In a specific case, a supporting ring is provided at the end of the second cross bar, and the metal container is in a cylindrical shape with a bottom diameter smaller than an upper diameter, so that the metal container can be clamped on the supporting ring.

[0014] Preferably, the experimental device for testing the radiant heat absorption performance of the coating of the utility model further includes a heat insulation board, which is horizontally arranged above the heater, and the bottom surface of the heat insulation board and the bottom surface of the metal container are located at the same horizontal plane. The heat insulation board is provided with large holes and small holes, and the large holes are used to be connected with the bottom of the metal container, and the small holes are used to be connected with the vertical rod. The heat insulation board can reduce heat loss and concentrate heat on the bottom of the two groups of metal containers.

[0015] Preferably, the heating medium of the heater is a silicon-molybdenum rod, and grooves for placing the silicon-molybdenum rods are provided at both ends of the heater base, and a plurality of silicon-molybdenum rods are evenly installed in the grooves.

[0016] Preferably, a hanging ring is provided on the top of the thermocouple, and is connected to the first crossbar via the hanging ring.

[0017] Through the experimental device for testing the radiant heat absorption performance of the coating of the utility model, the medium (heat transfer oil) in the container is heated in the form of radiant heat to simulate the actual working conditions to test the heat absorption performance of the coating. Under the same conditions of the distance between the heat source and the coating, the coating area, and the quality of the heat transfer oil, the ability of the two coatings to absorb radiant heat can be compared and tested; and the influence of different types of heat sources and different heat source temperatures on the heat absorption performance of the coating can be tested; the influence of different distances between the experimental coating and the heat source on the heat absorption performance of the coating can be tested; the coating formula design can be quickly optimized to improve the success rate of energy-saving coating research and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the experimental device according to the utility model.

[0019] Figure 2 It is a schematic diagram of the split structure of the experimental device according to the utility model.

[0020] Figure 3 It is a structural schematic diagram of the vertical rod and the base in the utility model.

[0021] Figure 4It is another structural schematic diagram of the experimental device according to the utility model.

[0022] Among them, the figure marks respectively represent: 1-bracket, 11-base, 111-screw hole, 121-thread, 122-scale line, 12-vertical rod, 13-first cross bar, 14-second cross bar, 15-support ring, 16-locking bolt, 2-metal container, 3-heater, 31-heater base, 32-heating medium, 33-groove, 4-thermocouple, 41-hanging ring, 5-insulation board, 51-large hole, 52-small hole, 6-thermal oil, 7-coating. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood by those skilled in the art that the embodiments described below are merely exemplary descriptions of the present invention and are not intended to limit the present invention in any way.

[0024] Reference Figure 1-4 According to the utility model, an experimental device for testing the radiant heat absorption performance of a coating mainly includes a bracket 1, a metal container 2, a heater 3, a thermocouple 4 and a heat insulation board 5.

[0025] The bracket 1 has a base 11, a vertical rod 12, a first crossbar 13 and a second crossbar 14. The vertical rod 12 is arranged on the base 1, one end of the first crossbar 13 and the second crossbar 14 are connected to the vertical rod 12, and the first crossbar 13 is arranged above the second crossbar 14. The metal container 2 is suspended on the second crossbar 14, the outer surface of the bottom is used to prepare the coating 7 to be tested, and the container is used to hold the thermal oil 6. The heater 3 is arranged below the metal container 2. One end of the thermocouple 4 is suspended on the first crossbar 13, and the other end extends into the thermal oil 6 in the metal container 2. Among them, the bracket 1, the metal container 2 and the thermocouple 4 are arranged in two groups that are symmetrical on the left and right, and the heater 3 is arranged directly below the two metal containers 2 on the left and right.

[0026] Specifically, the lower end of the vertical rod 12 is provided with a thread 121, which is connected to the screw hole 111 of the bracket base 11 through the thread 121. The first cross bar 13 and the second cross bar 14 are movably mounted on the vertical rod 12 and can be locked by a locking bolt 16. A scale line 122 is provided in the height direction of the vertical rod 12. A support ring 15 is provided at the end of the second cross bar 14. The metal container 2 is a cylindrical shape with a bottom diameter smaller than an upper diameter, so that it can be clamped on the support ring 15.

[0027] The heat insulation board 5 is horizontally arranged above the heater 3, and the bottom surface of the heat insulation board 5 is at the same level as the bottom surface of the metal container 2. The heat insulation board 5 is provided with a large hole 51 and a small hole 52. The large hole 51 is used to be sleeved with the bottom of the metal container 2, and the small hole 52 is used to be sleeved with the vertical rod 12. The heat insulation board 5 uses lightweight ceramic fiberboard, asbestos board and other lightweight materials that are resistant to high temperatures and have good heat insulation effects.

[0028] Specifically, the heater 3 includes a heater base 31 and a heating medium 32. The heating medium 32 is preferably a silicon molybdenum rod. Both ends of the heater base 31 are provided with grooves 33 for placing the silicon molybdenum rods. A plurality of silicon molybdenum rods are evenly installed in the grooves 33. The heater base 31 can be made of high-alumina refractory bricks.

[0029] Specifically, a hanging ring 41 is provided on the top of the thermocouple 4 , and the thermocouple 4 is connected to the first cross bar 13 via the hanging ring 41 .

[0030] In specific cases, the heat transfer oil 6 is an alkyl biphenyl type heat transfer oil with a boiling point above 300° C. When other heating media are selected, non-volatile, non-flammable, non-toxic and harmless heating media should be selected at the test temperature.

[0031] Specifically, before the coating 7 is prepared, the bottom of the metal container 2 is first sandblasted to ensure that the surface of the material reaches the rust removal level Sa3.0 standard, and then the coating, curing, baking, etc. are carried out according to the coating preparation process.

[0032] Specifically, the base 11, the vertical rod 12, the first cross rod 13, the second cross rod 14 and the supporting ring 15 are all made of high temperature resistant metal and remain unchanged in an environment of 500°C.

[0033] The following specifically introduces the operation method of the experimental device for testing the radiant heat absorption performance of the coating according to the utility model, which includes the following steps:

[0034] 1. Prepare two identical metal containers, using materials corresponding to the simulated working conditions. Prepare the experimental comparison coating on the outer bottom surface of the metal container according to the coating coating process.

[0035] 2. Start the heater to preheat and raise the temperature to the temperature required for the experiment.

[0036] 3. Pour the heating medium (heat transfer oil) into a metal container. The heat transfer oil in the two containers has the same mass and temperature.

[0037] 4. Place the metal container filled with heat transfer oil on the container support ring, and place the thermocouple probe into the heat transfer oil. The probe should be located in the center of the container and 1 / 2 of the depth of the heat transfer oil.

[0038] 5. Install the lightweight insulation board on the bracket and adjust the opening (large hole) of the lightweight insulation board to align with the bottom of the container;

[0039] 6. Move the heater to the bottom of the insulation board to heat the thermal oil. Record the temperature rise of the thermal oil per unit time. The temperature of the thermal oil should not exceed the maximum operating temperature.

[0040] 7. Calculate the heat Q absorbed by the heat transfer oil in the same time, the heat transfer oil calorific value C, the heat transfer oil mass M, the heat transfer oil initial temperature T0, and the heat transfer oil experiment end temperature T1, the formula: Q = C × M × (T1-T0), and compare the radiant heat absorption performance of different coatings. The larger the Q value, the stronger the coating's ability to absorb radiant heat.

[0041] The above are only preferred embodiments of the present invention. Any equivalent changes or modifications made according to the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims

1. An experimental device for testing the radiant heat absorption performance of a coating, characterized in that: include: The bracket (1) comprises a base (11), a vertical rod (12), a first cross rod (13) and a second cross rod (14); the vertical rod (12) is arranged on the base (11), one end of the first cross rod (13) and the second cross rod (14) are connected to the vertical rod (12), and the first cross rod (13) is arranged above the second cross rod (14); A metal container (2) is suspended on the second crossbar (14); the outer surface of the bottom is used to prepare the coating to be tested (7), and the container is used to hold the heat transfer oil (6); a heater (3) disposed below the metal container (2); and A thermocouple (4), one end of which is suspended on the first crossbar (13) and the other end of which extends into the heat transfer oil (6) in the metal container (2); The support (1), the metal container (2) and the thermocouple (4) are arranged in two groups which are symmetrical on the left and right, and the heater (3) is arranged directly below the two metal containers (2) on the left and right.

2. The experimental device according to claim 1, characterized in that: The first cross bar (13) and the second cross bar (14) are movably mounted on the vertical bar (12), and a scale line (122) is provided in the height direction of the vertical bar (12).

3. The experimental device according to claim 1, characterized in that: The lower end of the vertical rod (12) is provided with a thread (121) and is connected to the base (11) via the thread (121).

4. The experimental device according to claim 1, characterized in that: A supporting ring (15) is provided at the end of the second crossbar (14); the metal container (2) is in the shape of a cylinder with a bottom diameter smaller than an upper diameter, so that it can be clamped on the supporting ring (15).

5. The experimental device according to claim 1, characterized in that: It also includes a heat insulation board (5) which is horizontally arranged above the heater (3). The bottom surface of the heat insulation board (5) and the bottom surface of the metal container (2) are located at the same horizontal plane. The heat insulation board (5) is provided with a large hole (51) and a small hole (52). The large hole (51) is used to be sleeved with the bottom of the metal container (2), and the small hole (52) is used to be sleeved with the vertical rod (12).

6. The experimental device according to claim 1, characterized in that: The heating medium (32) of the heater (3) is a silicon-molybdenum rod, and grooves (33) for placing the silicon-molybdenum rods are provided at both ends of the heater base (31), and a plurality of silicon-molybdenum rods are evenly installed in the grooves (33).

7. The experimental device according to claim 1, characterized in that: A hanging ring (41) is provided on the top of the thermocouple (4) and is connected to the first crossbar (13) via the hanging ring (41).

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