Coating performance testing system suitable for oil refining reforming heating furnace

Abstract

The utility model discloses a coating performance test system suitable for an oil refining reforming heating furnace, which comprises a furnace body, and the furnace body is divided into a radiation chamber (1), a convection chamber (2) and a heat exchange chamber (3) from bottom to top; a burner (5) is arranged on the radiation chamber bottom wall (10) and is connected with a fuel supply pipeline (6); a radiation section furnace tube (7), a convection section furnace tube (8) and a heat exchange tube (9) are respectively arranged in the radiation chamber (1), the convection chamber (2) and the heat exchange chamber (3); and liquid flowmeters and thermometers are arranged at inlets and outlets of the radiation section furnace tube (7), the convection section furnace tube (8) and the heat exchange tube (9). The test system simulates the real working condition environment of each area of the heating furnace, can perform the experimental test of the surface coating in the whole area, reduces the research and development period and cost of the coating, and provides accurate and efficient services for energy conservation and emission reduction in the refining industry.

Description

Technical Field

[0001] The utility model relates to the technical field of surface coatings, and particularly relates to a coating performance testing system applicable to a reforming heating furnace in oil refining. Background Art

[0002] The reforming heating furnace in the refining and chemical industry is a high-energy-consuming device. By optimizing the air-fuel ratio of burners, reducing the excess air coefficient, and improving the heat insulation effect of the furnace lining, the thermal efficiency of the device can be improved, achieving the operation effect of energy conservation and emission reduction. In addition, with the development of surface functional materials in recent years, surface coatings with composite functions have played a role in energy conservation and emission reduction, increasing production and efficiency improvement in many fields. In the environment of high-temperature oxidation, corrosion, scaling, and coking in the heating furnace, the coating with composite functions can further play its roles of antioxidation, corrosion resistance, and anti-fouling and coking, ultimately further improving the application effect of energy conservation and emission reduction of the device.

[0003] Different coating raw material formulas play different roles. How to evaluate the actual performance of the coating has a significant promoting effect on the coating research and development process. In particular, a simulation testing device that is more in line with the actual working conditions of the device is particularly important. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a coating performance testing system applicable to a reforming heating furnace in oil refining, which heats the medium in the furnace tube through fuel combustion to simulate the influence of different types of surface coatings on the performance of the furnace lining and furnace tube under the real operating environment of the heating furnace.

[0005] According to the coating performance testing system applicable to a reforming heating furnace in oil refining of the utility model, it includes a furnace body, and the furnace body is divided into a radiant chamber, a convection chamber, and a heat exchange chamber from bottom to top; a burner is arranged on the bottom wall of the radiant chamber, and the burner is connected to a fuel supply pipeline; a radiant section furnace tube, a convection section furnace tube, and a heat exchange tube are respectively arranged in the radiant chamber, the convection chamber, and the heat exchange chamber. The inlets of the radiant section furnace tube, the convection section furnace tube, and the heat exchange tube are all arranged at the upper part of each chamber, and the outlets are arranged at the lower part of each chamber. Among them, the outlet of the convection section furnace tube is communicated with the inlet of the radiant section furnace tube; the radiant section furnace tube and the convection section furnace tube are used to conduct heat transfer oil, and the heat exchange tube is used to conduct circulating water. Liquid flow meters and thermometers are arranged at the inlet and outlet positions of the radiant section furnace tube, the convection section furnace tube, and the heat exchange tube.

[0006] Specifically, a first partition board is arranged between the radiant chamber and the convection chamber, and an opening is arranged in the center of the first partition board as the flue inlet of the convection chamber; a second partition board is arranged between the convection chamber and the heat exchange chamber, and an opening is arranged on the side deviated from the center of the second partition board as the flue inlet of the heat exchange chamber; an opening is arranged on the top wall of the heat exchange chamber as the flue outlet of the heat exchange chamber, and the flue outlet of the heat exchange chamber is arranged on the other side opposite to the flue inlet of the heat exchange chamber.

[0007] Preferably, the furnace tubes in the radiant section and the convection section are both spiral coiled tubes, and the heat exchange tubes are serpentine tubes.

[0008] Preferably, the heat exchange tubes are arranged in multiple series-connected layers, and a third partition is provided between adjacent layers. The third partition forms an intermediate flue at the connection of the heat exchange tubes in adjacent layers, and an S-shaped flue gas passage is formed between the flue gas inlet of the heat exchange chamber, the intermediate flue, and the flue gas outlet of the heat exchange chamber.

[0009] Specifically, the furnace bodies of the radiant chamber, the convection chamber, and the heat exchange chamber are formed by a three-layer combination of a furnace shell, heat-insulating refractory fiber wool, and light refractory bricks from the outside to the inside.

[0010] Preferably, temperature gauges are provided on the inner surfaces of the furnace bodies of the radiant chamber, the convection chamber, and the heat exchange chamber.

[0011] Specifically, a gas flow meter is provided on the fuel supply pipeline.

[0012] Specifically, a main support is provided at the lower part of the furnace body.

[0013] The coating performance test system of the present utility model designs a radiant section, a convection section, and a heat exchange section to test the influence of different coatings applied in different regions on the device in a real fuel combustion environment. The radiant section mainly includes furnace tubes and furnace walls. Applying a coating can improve the performance of the furnace tubes in absorbing radiant heat or improve the ability of the furnace lining to reflect radiant heat. The convection section mainly includes furnace tubes. Applying a coating can improve the anti-fouling and anti-coking performance of the furnace tubes. The heat exchange section mainly includes furnace tubes. Applying a coating can improve the dew point corrosion resistance and anti-scaling performance of the furnace tubes. This test system simulates the real working condition environment of each region of the heating furnace, can conduct experimental tests on the surface coating in the whole region, reduces the coating R & D cycle and cost, and provides accurate and efficient services for energy conservation and emission reduction in the refining industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. is the overall structural schematic diagram of the coating performance test system according to the present utility model.

[0015] Figure 2 FIG. is the internal structural schematic diagram of the coating performance test system according to the present utility model.

[0016] Figure 3 FIG. is the furnace body structural schematic diagram of the coating performance test system according to the present utility model.

[0017] Among them, each reference numeral represents respectively:

[0018] 1 - Radiation chamber, 2 - Convection chamber, 3 - Heat exchange chamber, 4 - Main support, 5 - Burner, 6 - Fuel supply pipe, 7 - Radiant section furnace tubes, 71 - Inlet of radiant section furnace tubes, 72 - Outlet of radiant section furnace tubes, 8 - Convection section furnace tubes, 81 - Inlet of convection section furnace tubes, 82 - Outlet of convection section furnace tubes, 9 - Heat exchange tubes, 91 - Inlet of heat exchange tubes, 92 - Outlet of heat exchange tubes, 10 - Bottom wall of radiation chamber, 11 - First partition, 12 - Second partition, 13 - Third partition, 14 - Top wall of heat exchange chamber, 15 - Convection chamber flue inlet, 16 - Heat exchange chamber flue inlet, 17 - Heat exchange chamber flue outlet, 18 - Intermediate flue, 19 - Furnace shell, 20 - Heat-insulating refractory fiber wool, 21 - Lightweight refractory brick. Detailed implementation mode

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Those skilled in the art should understand that the embodiments described below are only exemplary descriptions of the present invention and are not used to make any limitations thereto.

[0020] See Figure 1-2 , according to the coating performance test system for a refinery reforming heating furnace of the present invention, it includes a furnace body. The furnace body is square and is divided into a radiation chamber 1, a convection chamber 2 and a heat exchange chamber 3 from bottom to top. A main support 4 is arranged at the lower part of the furnace body. A burner 5 is arranged on the bottom wall 10 of the radiation chamber. The burner 5 is connected to a fuel supply pipe 6, and a gas flow meter is arranged on the fuel supply pipe 6. Radiant section furnace tubes 7, convection section furnace tubes 8 and heat exchange tubes 9 are respectively arranged in the radiation chamber 1, the convection chamber 2 and the heat exchange chamber 3. The inlets of the radiant section furnace tubes 7, the convection section furnace tubes 8 and the heat exchange tubes 9 are all arranged at the upper part of each chamber, and the outlets are arranged at the lower part of each chamber. Among them, the inlet 81 of the convection section furnace tubes extends out of the furnace body to connect to a heat transfer oil supply device; the outlet 82 of the convection section furnace tubes is communicated with the inlet 71 of the radiant section furnace tubes through a bent pipe; the outlet 72 of the radiant section furnace tubes extends out of the furnace body. The inlets 91 and outlets 92 of the heat exchange tubes both extend out of the furnace body to connect to a circulating water device. Liquid flow meters and temperature measuring instruments are arranged at the inlet and outlet positions of the radiant section furnace tubes 7, the convection section furnace tubes 8 and the heat exchange tubes 9.

[0021] In a specific case, a first partition 11 is arranged between the radiation chamber 1 and the convection chamber 2, and an opening is arranged in the center of the first partition 11 as the convection section flue inlet 15. A second partition 12 is arranged between the convection chamber 2 and the heat exchange chamber 3, and an opening is arranged on one side of the second partition 12 deviating from the center as the heat exchange chamber flue inlet 16. An opening is arranged on the top wall 14 of the heat exchange chamber as the heat exchange chamber flue outlet 17, and the heat exchange chamber flue outlet 17 is arranged on the other side opposite to the heat exchange chamber flue inlet 16.

[0022] In a specific case, the furnace tubes 7 in the radiant section and the furnace tubes 8 in the convective section are both spiral coil tubes, and the heat exchange tubes 9 are serpentine tubes. The heat exchange tubes 9 are arranged in series in multiple layers, and a third partition plate 13 is provided between adjacent layers. The third partition plate 13 forms an intermediate flue 18 at the connection of the heat exchange tubes 9 in adjacent layers. An S-shaped flue gas passage is formed among the flue gas inlet 16 of the heat exchange chamber, the intermediate flue 18, and the flue gas outlet 17 of the heat exchange chamber.

[0023] In a specific case, refer to Figure 3 , the furnace bodies of the radiant chamber 1, the convective chamber 2, and the heat exchange chamber 3 are formed by a combination of three layers from the outside to the inside, namely a furnace shell 19, a heat-insulating refractory fiber cotton 20, and a light refractory brick 21. The furnace shell 19 is usually made of metal, and a thermometer is provided on the inner surface of the furnace bodies of the radiant chamber 1, the convective chamber 2, and the heat exchange chamber 3.

[0024] In a specific case, the fuel supply pipeline 6, the furnace tubes 7 in the radiant section, the furnace tubes 8 in the convective section, and the heat exchange tubes 9 can all be fixed to the furnace body, the partition plate, or the furnace bottom through corresponding brackets. Overall furnace doors are provided in the radiant chamber 1 and the convective chamber 3 to facilitate the replacement of the furnace tubes.

[0025] The following describes the specific working process of the coating performance test system of the present utility model applicable to a refining reforming heating furnace:

[0026] 1. Prepare the experimental coating on the corresponding furnace tubes or furnace linings according to the coating construction requirements;

[0027] 2. Prepare the fuel according to the experimental requirements and replace the burner matching the fuel;

[0028] 3. Open the circulating water valve and the heat transfer oil valve, and keep the sufficient supply of circulating water and heat transfer oil during the device experiment;

[0029] 4. Ignite the burner, bake the coating according to the coating baking curve, and turn off the burner after baking;

[0030] 5. Check the appearance of the coating. Only when the coating has no peeling, flaking, cracking, or blistering can the next step of the test be carried out. If any abnormality is found in the coating, it should be re-sprayed and baked;

[0031] 6. Record the initial values of each instrument, ignite the burner according to the designed fuel flow rate, and conduct the experimental test according to the experimental design time. During each experiment, the inlet temperature of the heat transfer oil, the flow rate of the heat transfer oil, the inlet temperature of the circulating water, the flow rate of the circulating water, the calorific value of the fuel gas, and the flow rate of the fuel gas are kept the same;

[0032] 7. Collect data once every 1 hour during the experiment until the experiment ends. Change the coating type and repeat the experiment (multiple sets of experimental devices can also be built to conduct comparative experiments simultaneously).

[0033] 8. Experimental conclusion (the specific values can be calculated from data such as the calorific value of the fuel, the values of each instrument, the quality and heat capacity of the heat transfer oil):

[0034] ① The higher the temperature difference between the inlet and outlet of the heat transfer oil in the radiation chamber, and the lower the flue gas temperature at the outlet of the radiation chamber, it proves that the furnace tube coating has stronger ability to absorb radiant heat, and the furnace lining coating has strong ability to reflect radiant heat.

[0035] ② The higher the temperature difference between the inlet and outlet of the heat transfer oil in the convection chamber, and the higher the temperature difference between the inlet and outlet of the flue gas, it proves that the fouling and coking amount on the outer wall of the furnace tube is small, and the heat transfer effect of the furnace tube is good.

[0036] ③ The smaller the temperature difference between the inlet and outlet of the circulating water, it proves that the heat transfer effect between the media in the radiation section and the convection section is better, and the operating efficiency of the device is higher.

[0037] ④ The dew point corrosion condition of the heat exchange tube can be judged by comparing the changes such as discoloration, rusting, and piercing of the furnace tube appearance.

[0038] The innovation and advantages of this test system are as follows:

[0039] 1. The test system simulates the operation process of the heating furnace. By collecting the operation data of key nodes for calculation and analysis, accurate experimental results can be obtained.

[0040] 2. The device has a replaceable burner, which can test the influence of different fuels on the coating performance, such as natural gas, in-plant fuel gas or fuel oil, etc.

[0041] 3. The furnace tubes in the radiation section and the convection section adopt spiral coil tubes, which are easy to disassemble and replace as a whole. The device can test different materials of furnace tubes and different coatings by replacing the furnace tubes. The surface coating of the furnace tube can be removed by sandblasting, and the furnace tube can be reused.

[0042] 4. The test system has small heat dissipation loss, high accuracy of experimental data, fast experimental speed, and reduces the R & D cycle of coating materials.

[0043] The above are only the preferred embodiments of the present utility model. Any equivalent changes or modifications made according to the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A coating performance testing system suitable for oil refining reforming heating furnace, characterized in that: The invention comprises a furnace body, which is divided into a radiation chamber (1), a convection chamber (2) and a heat exchange chamber (3) from bottom to top; a burner (5) is arranged on the bottom wall (10) of the radiation chamber, and the burner (5) is connected to a fuel supply pipeline (6); a radiation section furnace tube (7), a convection section furnace tube (8) and a heat exchange tube (9) are respectively arranged in the radiation chamber (1), the convection chamber (2) and the heat exchange chamber (3); the inlets of the radiation section furnace tube (7), the convection section furnace tube (8) and the heat exchange tube (9) are arranged at the upper part of each chamber, and the outlets are arranged at the lower part of each chamber, wherein the outlet of the convection section furnace tube (8) is connected to the inlet of the radiation section furnace tube (7); the radiation section furnace tube (7) and the convection section furnace tube (8) are used to pass heat transfer oil, and the heat exchange tube (9) is used to pass circulating water; and liquid flow meters and thermometers are arranged at the inlet and outlet positions of the radiation section furnace tube (7), the convection section furnace tube (8) and the heat exchange tube (9).

2. The coating performance testing system according to claim 1, characterized in that: A first partition (11) is arranged between the radiation chamber (1) and the convection chamber (2), and an opening is arranged at the center of the first partition (11) as a convection chamber smoke inlet (15); a second partition (12) is arranged between the convection chamber (2) and the heat exchange chamber (3), and an opening is arranged on a side of the second partition (12) that is offset from the center as a heat exchange chamber smoke inlet (16); an opening is arranged on the top wall (14) of the heat exchange chamber as a heat exchange chamber smoke outlet (17), and the heat exchange chamber smoke outlet (17) is arranged on the other side opposite to the heat exchange chamber smoke inlet (16).

3. The coating performance testing system according to claim 2, characterized in that: The radiation section furnace tube (7) and the convection section furnace tube (8) are both spiral coils, and the heat exchange tube (9) is a serpentine tube.

4. The coating performance testing system according to claim 3, characterized in that: The heat exchange tubes (9) are multiple layers connected in series, and a third partition (13) is arranged between adjacent layers. The third partition (13) forms an intermediate flue (18) at the connection between the adjacent layers of heat exchange tubes (9), and an S-shaped flue gas channel is formed between the heat exchange chamber flue inlet (16), the intermediate flue (18) and the heat exchange chamber flue outlet (17).

5. The coating performance testing system according to claim 1, characterized in that: The furnace bodies of the radiation chamber (1), the convection chamber (2) and the heat exchange chamber (3) are formed from the outside to the inside by a three-layer combination of a furnace shell (19), heat-insulating refractory fiber wool (20) and lightweight refractory bricks (21).

6. The coating performance testing system according to claim 5, characterized in that: Thermometers are arranged on the inner surfaces of the furnace bodies of the radiation chamber (1), the convection chamber (2) and the heat exchange chamber (3).

7. The coating performance testing system according to claim 1, characterized in that: A gas flow meter is provided on the fuel supply pipeline (6).

8. The coating performance testing system according to claim 1, characterized in that: A main body support (4) is arranged at the lower part of the furnace body.

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