Rapid heating fire resistance test device

Abstract

The utility model discloses a rapid heating fire resistance test device, which relates to the technical field of fire resistance test of fireproof materials and comprises a pressure transmitter, a thermocouple, a control cabinet, a natural gas header pipe, an air blower, an air header pipe, a burner, a flame detector, an igniter, a detection electrode and an ignition electrode. The natural gas header pipe is further provided with a pressure regulating valve located on the outlet side of the filter and an air-fuel proportional valve located on the outlet side of the pressure regulating valve. An air inlet of the air-fuel proportional valve communicates with the air header pipe. The ignition electrode extends into a combustion area of the burner; the flame detector is an ion flame detector; a smoke cooling device is arranged on the smoke exhaust pipeline between the exhaust fan and the test furnace; the control cabinet is electrically connected with the blower through the frequency converter. According to the utility model, the ignition success rate can be improved, natural gas and combustion-supporting air are proportionally adjusted through the air-fuel proportional valve, and the furnace temperature can be automatically and accurately controlled easily; a natural gas path is high in stability; mistaken monitoring of flames can be avoided; and the service life of the exhaust fan can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of fire resistance performance testing technology for fire-resistant materials, and more specifically, to a rapid heating fire resistance testing device. Background Technology

[0002] Rapid-heating fire resistance testing equipment is used for testing and evaluating the fire resistance performance of fire-resistant materials used in petrochemical bases, near-shore or offshore buildings and structures, oil and gas fields or oil storage tank areas, and tunnels. Products tested include: fire-resistant coatings for steel structures, fire-resistant panels, fire-resistant coatings for concrete structures, inorganic fibers, etc. Its main technical content is fire resistance testing. Existing rapid-heating fire resistance testing equipment has the following shortcomings:

[0003] 1) The air and natural gas cannot be automatically regulated. The natural gas flow is regulated by an electric regulating valve, while the combustion air is regulated manually. This regulation method makes it difficult to achieve the optimal air-fuel ratio, and it is also very difficult to achieve automatic control of the furnace temperature.

[0004] 2) The pressure of the liquefied natural gas filling is unstable, and there is a lack of pressure stabilization devices;

[0005] 3) The burner assembly uses an ignition gun to ignite the natural gas sprayed from the burner. However, the flame of the ignition gun is weak and lacks rigidity. The flame of the ignition gun will be extinguished when the furnace pressure fluctuates or the airflow blows, which poses a safety hazard to the furnace.

[0006] 4) The test furnace is a circular furnace, and the burners are equipped with one-to-one photoelectric flame detectors. The photosensitive tube can not only sense its own flame, but also monitor the flame of another burner. The flame detector is prone to false detection.

[0007] 5) The temperature inside the rapid heating refractory test furnace can reach up to 1200℃ and the temperature is held for a long time. Ordinary fans usually start making noise after more than ten minutes, which poses a great safety hazard.

[0008] 6) Rapid heating refractory test equipment requires fast heating speed and high temperature. The heat load is large during heating and very small during heat preservation. Therefore, it requires a large dynamic range of heat load. In the past, furnace temperature control was mainly achieved through electric regulating valves, but there was no proportional air supply, which made it difficult for the furnace temperature to operate according to the curve. Utility Model Content

[0009] The present invention provides a rapid heating fire resistance testing device that can solve the above-mentioned problems.

[0010] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0011] This utility model provides a rapid heating fire resistance testing device, including a pressure transmitter, a thermocouple, a control cabinet, a natural gas main, a hand valve, a filter, and a pressure gauge installed on the natural gas main, a blower, an air main connected to the outlet end of the blower, a burner assembly installed on the test furnace, and an exhaust fan of the test furnace connected through a flue gas duct. The burner assembly includes a burner, a flame detector, an igniter, a detection electrode, and an ignition electrode. The natural gas main is also equipped with a pressure regulating valve located on the outlet side of the filter and an air-fuel ratio valve located on the outlet side of the pressure regulating valve. The air inlet of the air-fuel ratio valve is connected to the air main. The ignition electrode extends into the combustion zone of the burner. The flame detector is an ionization flame detector. A flue gas cooling device is installed in the flue gas duct between the exhaust fan and the test furnace. The control cabinet is electrically connected to the blower through a first frequency converter.

[0012] As a further description of the above technical solution, the pressure gauge includes a first pressure gauge and a second pressure gauge, and the hand valve includes a first hand valve, a second hand valve, a third hand valve, a fourth hand valve, and a fifth hand valve; the first hand valve, the filter, the first pressure gauge, the second hand valve, the pressure regulating valve, the second pressure gauge, the air-fuel proportional valve, and the fourth hand valve are installed sequentially on the natural gas main; one end of the third hand valve is connected between the pressure regulating valve and the second hand valve, and the other end is connected between the outlet side of the fourth hand valve and one end of the fifth hand valve; the other end of the fifth hand valve is connected between the second pressure gauge and the air-fuel proportional valve.

[0013] As a further description of the above technical solution, the burner assembly includes a sixth manual valve, a solenoid valve, a manual butterfly valve, as well as the burner, a flame detector, an igniter, a detection electrode, and an ignition electrode; the sixth manual valve, the solenoid valve, and the natural gas inlet of the burner are connected in stages; the air inlet of the burner is connected to the air main pipe through the manual butterfly valve; the detection electrode is located in the combustion zone of the burner; the flame detector is electrically connected to the detection electrode; the igniter is electrically connected to the ignition electrode; the flame detector, the igniter, and the solenoid valve are electrically connected to the control cabinet.

[0014] As a further description of the above technical solution, the natural gas main pipe is equipped with a gas leak monitoring device; the top of the test furnace is equipped with an explosion-proof pressure relief device; the flue gas cooling device is a circulating water cooling device; the air main pipe is equipped with a pressure sensor; and the control cabinet is electrically connected to the pressure sensor and the gas alarm system.

[0015] As a further description of the above technical solution, the control cabinet is electrically connected to the exhaust fan via a second frequency converter.

[0016] As a further description of the above technical solution, the control cabinet is electrically connected to the host computer.

[0017] As a further description of the above technical solution, the burner assembly has six parts, with four parts evenly arranged in the upper circumference of the furnace chamber of the test furnace and two parts arranged near the bottom.

[0018] As a further description of the above technical solution, there are two pressure transmitters used to measure the pressure at different locations inside the test furnace; there are eight thermocouples used to measure the temperature at different locations inside the test furnace.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1) Removing the ignition gun and allowing direct burner ignition improves the ignition success rate, simplifies the system, and makes furnace temperature control easier; adjusting the ratio of natural gas to combustion air via the air-fuel ratio valve makes it easier to achieve the optimal air-fuel ratio and facilitates automatic and precise furnace temperature control; installing a pressure regulating valve on the main natural gas pipeline makes the natural gas pressure entering the unit more stable; replacing the photoelectric flame detector with an ionization flame detector avoids false flame detection; adding a flue gas cooling device extends the service life of the exhaust fan; adjusting the blower frequency via a frequency converter precisely controls the air supply volume, and accurately controlling the air-fuel ratio through the air-fuel ratio valve to achieve the temperature control requirements allows the furnace temperature to operate according to the curve.

[0021] 2) In the past, when debugging power fire curves, tunnel HC fire curves, and petrochemical fire curves, the same problem was encountered: during the constant temperature process after the furnace temperature reached the highest temperature of the curve, the furnace temperature continued to rise even at the lowest power. When conducting these tests, this utility model can select four burners for testing, and at the same time, the exhaust fan runs at full load during the constant temperature stage, so that the constant temperature process after the furnace temperature reaches the highest temperature of the curve is stable and reliable.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, embodiments of this utility model are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the rapid heating fire resistance test device described in the embodiment;

[0025] Figure 2 This is a schematic diagram of the natural gas main pipeline system in the embodiment;

[0026] Figure 3 This is a schematic diagram of the burner assembly in the embodiment;

[0027] In the diagram: 1. Natural gas main pipeline system; 2. Burner assembly; 3. Test furnace; 4. Pressure transmitter; 5. Thermocouple; 6. Gas leak monitoring device; 7. Blower; 8. Pressure sensor; 9. First frequency converter; 10. Control cabinet; 11. Host computer; 12. Second frequency converter; 13. Flue gas cooling device; 14. Exhaust fan; 15. Explosion-proof pressure relief device; 16. Gas alarm system; 17. Air main pipeline; 18. Filter; 19. First pressure gauge; 20. Pressure regulating valve; 21. Second pressure gauge; 22. Air-fuel proportional valve; 23. First manual valve; 24. Second manual valve; 25. Third manual valve; 26. Fourth manual valve; 27. Fifth manual valve; 28. Natural gas main pipeline; 29. ​​Solenoid valve; 30. Manual butterfly valve; 31. Burner; 32. Detection electrode; 33. Ignition electrode; 34. Flame detector; 35. Ignition device; 36. Sixth manual valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0029] Please refer to Figure 1 , Figure 2 and Figure 3 This embodiment provides a rapid heating refractory test device, including a pressure transmitter 4, a thermocouple 5, a host computer 11, a control cabinet 10 electrically connected to the host computer 11, a natural gas main pipe 28, a hand valve, a filter 18, and a pressure gauge installed on the natural gas main pipe 28, a blower 7, an air main pipe 17 connected to the outlet end of the blower 7, a burner assembly installed on the test furnace 3, and an exhaust fan 14 connected to the test furnace 3 through a flue pipe. The burner assembly includes a burner 31, a flame detector 34, an igniter 35, a detection electrode 32, and an ignition point. The ignition electrode 33 and the natural gas main pipe 28 are also equipped with a pressure regulating valve 20 located on the outlet side of the filter 18 and an air-fuel ratio valve 22 located on the outlet side of the pressure regulating valve 20. The air inlet of the air-fuel ratio valve 22 is connected to the air main pipe 17. The ignition electrode 33 extends into the combustion zone of the burner 31. The flame detector 34 is an ionization flame detector. The flue gas cooling device 13 is installed in the exhaust pipe between the exhaust fan 14 and the test furnace 3. The control cabinet 10 is electrically connected to the blower 7 through the first frequency converter 9 and electrically connected to the exhaust fan 14 through the second frequency converter 12.

[0030] In this embodiment, the pressure gauges include a first pressure gauge 19 and a second pressure gauge 21, and the hand valves include a first hand valve 23, a second hand valve 24, a third hand valve 25, a fourth hand valve 26, and a fifth hand valve 27. The first hand valve 23, the filter 18, the first pressure gauge 19, the second hand valve 24, the pressure regulating valve 20, the second pressure gauge 21, the air-fuel proportional valve 22, and the fourth hand valve 26 are installed in stages on the natural gas main pipe 28. One end of the third hand valve 25 is connected between the pressure regulating valve 20 and the second hand valve 24, and the other end is connected between the outlet side of the fourth hand valve 26 and one end of the fifth hand valve 27. The other end of the fifth hand valve 27 is connected between the second pressure gauge 21 and the air-fuel proportional valve 22.

[0031] In this embodiment, the burner assembly includes a sixth manual valve 36, a solenoid valve 29, a manual butterfly valve 30, a burner 31, a flame detector 34, an igniter 35, a detection electrode 32, and an ignition electrode 33; the sixth manual valve 36, the solenoid valve 29, and the natural gas inlet of the burner 31 are connected in stages; the air inlet of the burner 31 is connected to the air main 17 through the manual butterfly valve 30; the detection electrode 32 is located in the combustion zone of the burner 31; the flame detector 34 is electrically connected to the detection electrode 32; the igniter 35 is electrically connected to the ignition electrode 33; the flame detector 34, the igniter 35, and the solenoid valve 29 are electrically connected to the control cabinet 10.

[0032] In this embodiment, a gas leak monitoring device 6 is installed on the natural gas main pipe 28; an explosion-proof pressure relief device 15 is installed on the top of the test furnace 3; the flue gas cooling device 13 is a circulating water cooling device; a pressure sensor 8 is installed on the air main pipe 17; and the control cabinet 10 is electrically connected to the pressure sensor 8 and the gas alarm system 16.

[0033] In this embodiment, the experimental furnace 3 has dimensions of Φ1800×3000mm, a furnace chamber dimension of Φ1300×1800mm, and a furnace chamber clearance of 2.39m. 3 The test furnace 3 is equipped with 6 burner assemblies. Four are evenly arranged circumferentially in the upper part of the furnace (a plane 2.18m above the bottom), and two are arranged near the bottom (a plane 1m above the bottom). The natural gas consumption of burner 31 is 50m³. 3 / h.

[0034] The valve size of the hand valve and pressure regulating valve 20 is DN50, the pipeline size of filter 18 is DN50, the valve size of air-fuel proportional valve 22 is DN80, the valve size of solenoid valve 29 is DN32, and the natural gas pipeline diameter before solenoid valve 29 is DN32 for each burner 31; the natural gas pressure before pressure regulating valve 20 is 0.2MPa, and the pressure becomes 15-20kPa after being regulated by pressure regulating valve 20.

[0035] The technical parameters of blower 7 are: power 5.5kW, total pressure 3407Pa, flow rate 3251m³ / h. 3 / h, controlled by the matching 5.5kW first frequency converter 9. The diameter of the air duct in front of each burner 31 is DN80.

[0036] The technical parameters of exhaust fan 14 are: power 7.5kW, total pressure 5323Pa, flow rate 3166m³ / h. 3 The system operates at a rate of / h, controlled by a matching 7.5kW second frequency converter 12. The diameter of the exhaust pipe is DN125. The pipe between the exhaust port of the test furnace 3 and the exhaust fan 14 is covered by a DN300 sleeve, which is part of the circulating water cooling device. The cooling water in the sleeve enters from the top and exits from the bottom. The sleeve is 6m long. The exhaust pipe of the exhaust fan 14 is connected to the flue gas treatment device of the quality inspection center.

[0037] There are two pressure transmitters 4, used to measure the pressure at different locations inside the test furnace 3; there are eight thermocouples 5, used to measure the temperature at different locations inside the test furnace 3.

[0038] All test data were collected by the data acquisition box. The rapid heating refractory test device collected 8 furnace temperature signals (obtained by the above eight thermocouples 5), 18 sample temperature signals (obtained by the thermoelectric sensors installed on the sample), and 2 furnace pressure signals (obtained by the pressure transmitter 4).

[0039] The host computer 11 is responsible for data processing, display, and issuing control commands. After the test, the host computer 11 will print out the test information, furnace temperature curve and data, furnace pressure, and sample temperature curve and data. The furnace front control cabinet 10 is used for on-site debugging, maintenance, and repair of the test furnace 3. It receives commands from the host computer 11 to control the gas system and air supply system, and displays the working status, furnace temperature, and furnace pressure of the test furnace 3. The furnace temperature control principle of the rapid heating refractory test device is achieved by adjusting the frequency of the blower 7 through the first frequency converter 9 to control the air supply volume, and by controlling the air-fuel ratio through the air-fuel proportional valve 22 to achieve the required temperature control.

[0040] In this embodiment, flame monitoring is performed by using an ionization flame detector to monitor the combustion status of burner 31. If burner 31 fails to ignite on the first attempt, a second ignition attempt will be made. If the second attempt also fails, the natural gas solenoid valve 29 of burner 31 will automatically close. Furthermore, this embodiment employs a furnace pressure over-limit shutdown mechanism. When the furnace pressure exceeds a certain limit, the test furnace 3 will automatically shut down the blower 7 and all natural gas solenoid valves 29, and the test furnace 3 will cease operation. Explosion-proof pressure relief is only implemented in cases where an explosion inside the furnace is unavoidable. In this case, the explosion-proof vent on the furnace top is raised, reducing the furnace pressure and ensuring the safety of the test furnace 3 and on-site personnel. Gas leak monitoring only functions when a gas pipeline leaks in the test furnace 3. In this case, the gas alarm system 16 installed in the combustion test hall where this device is located will alarm and prompt personnel to stop the test, shut off the outdoor gas supply main, and activate all explosion-proof axial flow fans on the roof. Simultaneously, personnel inside the chamber will be evacuated promptly.

[0041] In this embodiment, the rapid heating fire resistance test device is configured as follows during the cooling process when debugging the tunnel RABT fire curve: when the average temperature inside the test furnace 3 is 15°C higher than the current standard temperature, each burner 31 is closed sequentially; when the average temperature inside the test furnace 3 is 15°C lower than the current standard temperature, each burner 31 is opened sequentially, and the frequency of the blower 7 is synchronized with that of the exhaust fan 14; when the average temperature inside the test furnace 3 drops to 390°C and all burners 31 are closed, both the blower 7 and the exhaust fan 14 operate at full load; where the current standard temperature refers to the temperature requirement determined according to the current stage of the tunnel RABT fire curve under the tunnel fire scenario.

[0042] In this embodiment, when the rapid heating fire resistance test device is used to debug the electric fire curve, tunnel HC fire curve and petrochemical fire curve, four burners 31 are selected for testing, and the exhaust fan 14 is running at full load during the constant temperature stage.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rapid heating fire resistance test device, comprising a pressure transmitter (4), a thermocouple (5), a control cabinet (10), a natural gas main (28), a hand valve, a filter (18), and a pressure gauge disposed on the natural gas main (28), a blower (7), an air main (17) connected to the outlet end of the blower (7), a burner assembly installed in a test furnace (3), and an exhaust fan (14) connected to the test furnace (3) via a flue gas pipe, wherein the burner assembly comprises a burner (31), a flame detector (34), an igniter (35), a detection electrode (32), and an ignition electrode (33), characterized in that, The natural gas main (28) is also equipped with a pressure regulating valve (20) located on the outlet side of the filter (18) and an air-fuel ratio valve (22) located on the outlet side of the pressure regulating valve (20). The air inlet of the air-fuel ratio valve (22) is connected to the air main (17). The ignition electrode (33) extends into the combustion zone of the burner (31). The flame detector (34) is an ion flame detector. A flue gas cooling device (13) is provided in the exhaust pipe between the exhaust fan (14) and the test furnace (3). The control cabinet (10) is electrically connected to the blower (7) through the first frequency converter (9).

2. The rapid heating refractory testing device according to claim 1, characterized in that, The pressure gauges include a first pressure gauge (19) and a second pressure gauge (21), and the hand valves include a first hand valve (23), a second hand valve (24), a third hand valve (25), a fourth hand valve (26), and a fifth hand valve (27). The first hand valve (23), the filter (18), the first pressure gauge (19), the second hand valve (24), the pressure regulating valve (20), the second pressure gauge (21), the air-fuel ratio valve (22), and the fourth hand valve (26) are installed in sequence on the natural gas main (28). One end of the third hand valve (25) is connected between the pressure regulating valve (20) and the second hand valve (24), and the other end is connected between the outlet side of the fourth hand valve (26) and one end of the fifth hand valve (27). The other end of the fifth hand valve (27) is connected between the second pressure gauge (21) and the air-fuel ratio valve (22).

3. The rapid heating refractory testing device according to claim 1, characterized in that, The burner assembly includes a sixth hand valve (36), a solenoid valve (29), a manual butterfly valve (30), and the burner (31), a flame detector (34), an igniter (35), a detection electrode (32), and an ignition electrode (33); the sixth hand valve (36), the solenoid valve (29), and the natural gas inlet of the burner (31) are connected in stages; the air inlet of the burner (31) is connected to the air main (17) through the manual butterfly valve (30); the detection electrode (32) is located in the combustion zone of the burner (31); the flame detector (34) is electrically connected to the detection electrode (32); the igniter (35) is electrically connected to the ignition electrode (33); the flame detector (34), the igniter (35), and the solenoid valve (29) are electrically connected to the control cabinet (10).

4. The rapid heating refractory testing device according to claim 1, characterized in that, The natural gas main pipe (28) is equipped with a gas leak monitoring device (6); the top of the test furnace (3) is equipped with an explosion-proof pressure relief device (15); the flue gas cooling device (13) is a circulating water cooling device; the air main pipe (17) is equipped with a pressure sensor (8); the control cabinet (10) is electrically connected to the pressure sensor (8) and the gas alarm system (16).

5. The rapid heating refractory testing device according to claim 1, characterized in that, The control cabinet (10) is electrically connected to the exhaust fan (14) via a second frequency converter (12).

6. The rapid heating refractory testing device according to claim 1, characterized in that, The control cabinet (10) is electrically connected to the host computer (11).

7. The rapid heating refractory testing device according to claim 1, characterized in that, There are six burner assemblies, with four evenly arranged in the upper part of the furnace chamber of the test furnace (3) and two arranged near the bottom.

8. The rapid heating refractory testing device according to claim 7, characterized in that, There are two pressure transmitters (4) used to measure the pressure at different locations inside the test furnace (3); there are eight thermocouples (5) used to measure the temperature at different locations inside the test furnace (3).

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