CN104677939A - Low-oxygen-concentration environment radiation heating experiment device for cone calorimeter - Google Patents
Low-oxygen-concentration environment radiation heating experiment device for cone calorimeter Download PDFInfo
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- CN104677939A CN104677939A CN201510134083.8A CN201510134083A CN104677939A CN 104677939 A CN104677939 A CN 104677939A CN 201510134083 A CN201510134083 A CN 201510134083A CN 104677939 A CN104677939 A CN 104677939A
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Abstract
The invention relates to a low-oxygen-concentration environment radiation heating experiment device for a cone calorimeter. Compared with the prior art, the low-oxygen-concentration environment radiation heating experiment device overcomes the defect that an experiment device used for the cone calorimeter in the low-oxygen-concentration environment is not available. According to the low-oxygen-concentration environment radiation heating experiment device, four pipeline brackets are respectively and vertically arranged at the lower part of a circulating pipeline; a plurality of vent holes are respectively formed in the inner side of the circulating pipeline; a nitrogen and oxygen supply pipe is connected at the outer side of the circulating pipeline; the shape of the circulating pipeline is the same as that of a sample rack, and the area of the circulating pipeline is larger than that of the sample rack; the circulating pipeline stands on a base by the pipeline brackets; the circulating pipeline is arranged at the periphery of the sample rack, and the center point on the upper surface of the circulating pipeline is coincided with that on the upper surface of the sample rack; a conical heater is arranged above the circulating pipeline; and the center point of the conical heater vertically corresponds to that of the circulating pipeline. After the device is used, a radiation heating experiment is carried out on the cone calorimeter in the low-oxygen-concentration environment.
Description
Technical field
The present invention relates to cone calorimetry technical field, specifically a kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry.
Background technology
Cone calorimetry is National Institute of Standards and Technology (NIST) in early eighties exploitation in last century, for small scale (bench-scale) the fire test device of material combustion performance.Through the practices of nearly 30 years and perfect, cone calorimetry can the many-sided fire burning performance of test material.The maximum feature of cone calorimetry is exactly by the heat flow rate per unit area in taper well heater simulated fire, and material is burnt under standard fire condition, the HRR of test material while of energy, every dechforination in combustion such as the productive rate of burning gases.Because in cone calorimetry experimental data and natural fire, the burning behavior of material has reasonable correlativity, cone calorimetry simplifies the multiple uncertain factor in actual fire, be the material combustion model under the infrared source effect under ideal environment, be convenient to the combustion characteristics of research material.Cone calorimetry test has the advantages such as simple to operate, with low cost, and therefore, cone calorimetry is further extensive in the application of the research fields such as Fire Science, fire engineering, material be fire-retardant.
The principle of cone calorimetry experimental provision is under specimen surface is exposed to stable heat radiation, and heat radiation produces from a conical well heater, and scope is between 0-100kW/m2.Volatile gas escapes out from the sample of heating, and is lighted by electric spark initiating device.Burned gas is collected to do further analysis by blower fan.Can HRR be calculated to this gas analysis, and assessment smog toxicity.Adopt the mass loss rate of weighing device record sample, the light decrement of laser equipment test cigarette, cone calorimetric test suitable amount formed material Reaction to fire situation simultaneously.
But existing cone calorimetry is merely able to test sample in the fire burning performance simplifying aerobic in natural fire situation, such as hypobaric hypoxia storehouse, hypobaric hypoxia storehouse can only realize low oxygen content, but oxygen concentration is constant, for glowing in actual fire, the situation of the burning of underground fire, high altitude localities hypobaric hypoxia and Non-oxygen pyrolytic cannot realize, therefore, how a kind of cone calorimetry combustion experimental device that can realize under low oxygen concentration or oxygen-free environment of development and Design is current urgent problem.
Summary of the invention
The object of the invention is to solve in prior art the defect that there is no for cone calorimetry experimental provision in low oxygen concentration environment, providing a kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry to solve the problems referred to above.
To achieve these goals, technical scheme of the present invention is as follows:
For a low oxygen concentration environmental radiation heating experimental device for cone calorimetry, comprise base and bracing frame, bracing frame is vertically mounted on base, bracing frame is provided with taper well heater, the inwall of taper well heater is provided with spiral heating wire,
Described base is placed with scales/electronic balance weighing platform, scales/electronic balance weighing platform is provided with electronic balance support, electronic balance support is provided with specimen holder; The bottom of circulating line is vertically installed with 4 supports of pipelines respectively, the inner side of circulating line is respectively equipped with several vent ports, the outside of circulating line is connected to nitrogen oxygen supply pipe, the shape of circulating line is identical with sample rack and the area of circulating line is greater than sample rack, circulating line stands on base by support of pipelines, and circulating line is positioned at the periphery of sample rack and the central point of the central point of circulating line upper surface and sample rack upper surface coincides; Described taper well heater is positioned at the top of circulating line, and the central point of taper well heater is vertical corresponding with the central point of circulating line.
Also comprise exhaust fume collecting hood, exhaust fume collecting hood top is provided with smoke exhaust pipe, and exhaust fume collecting hood is positioned at the top of taper well heater, and the central point of exhaust fume collecting hood is vertical corresponding with the central point of taper well heater.
The upper surface of described sample rack is provided with concave station, and the central point of concave station is vertical corresponding with the central point of taper well heater.
Also comprise thermal insulation board, described thermal insulation board is laterally movably arranged on bracing frame, and thermal insulation board is between taper well heater and circulating line.
Described circulating line and the shape of sample rack are square, and the quantity of described nitrogen oxygen supply pipe is 2, and two nitrogen oxygen supply pipes lay respectively on cornerwise two summits of circulating line and the airflow circulating direction of two nitrogen oxygen supply pipes is identical.
The diameter of described exhaust fume collecting hood end opening is greater than the suitable for reading of taper well heater.
beneficial effect
A kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry of the present invention, compared with prior art can realize carrying out radiation heating experiment for cone calorimetry under low oxygen concentration environment.The present invention is designed by the structural relation of circulating line and circulating line and sample rack, effectively improve the nitrogen gas concn of sample upper surface, uniform low oxygen concentration or oxygen-free environment under realizing cone calorimetry radiation heating, and oxygen concentration is controlled, effectively realize effectively being separated and completely cutting off of sample and oxygen, make sample effectively can realize hypoxemia or Non-oxygen pyrolytic and burning under suffered heat radiation, reach the pyrolytic process not having oxygen to participate in.For the burning performance of research material, the composition of Thermal Analysis Kinetics performance and material and structure have significant effect, have stable performance, easy to operate controlled, reproducible feature.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of bracing frame in the present invention;
Fig. 3 is the structural representation of assembly of weighing in the present invention;
Fig. 4 is the structural representation of circulating line in the present invention;
Fig. 5 is the structural representation of taper well heater in the present invention;
Fig. 6 is the structural representation of exhaust fume collecting hood and smoke exhaust pipe in the present invention;
Wherein, 1-base, 2-scales/electronic balance weighing platform, 3-electronic balance support, 4-specimen holder, 5-support of pipelines, 6-nitrogen oxygen supply pipe, 7-circulating line, 8-vent port, 9-taper well heater, 10-spiral heating wire, 11-exhaust fume collecting hood, 12-smoke exhaust pipe, 13-bracing frame, 14-concave station, 15-thermal insulation board, 16-ceiling, 17-air exhauster.
Embodiment
For making to have a better understanding and awareness architectural feature of the present invention and effect of reaching, coordinating detailed description in order to preferred embodiment and accompanying drawing, being described as follows:
As shown in Figure 2, a kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry of the present invention, comprise base 1 and bracing frame 13, bracing frame 13 is vertically mounted on base 1, for supporting taper well heater 9.Bracing frame 13 is provided with taper well heater 9.As shown in Figure 5, the inwall of taper well heater 9 is provided with spiral heating wire 10, spiral heating wire 10 is by the energising of prior art content.After powered up, taper well heater 9 can produce the radiant heat flux of scope between 0-100kW/ to spiral heating wire 10.
As shown in Figure 1, base 1 is placed with scales/electronic balance weighing platform 2, scales/electronic balance weighing platform 2 can be connected with computer by data line in use, makes the mass loss change real time record of sample on computers.As shown in Figure 3, assembly of weighing is for monitoring the change of sample in experimentation, and it comprises scales/electronic balance weighing platform 2 and electronic balance support 3, scales/electronic balance weighing platform 2 is provided with electronic balance support 3, electronic balance support 3 is provided with specimen holder 4.For bearing test specimen on specimen holder 4, on specimen holder 4 can horizontal positioned long for 100mm, wide be 100m, highly be the laboratory sample of 30mm, such scales/electronic balance weighing platform 2 can the change of real-time sample in an experiment.As shown in Figure 3, in order to better place sample and form low oxygen concentration environment, the upper surface of sample rack 4 can be provided with concave station 14.Concave station 14 bears sample, and the central point of concave station 14 is vertical corresponding with the central point of taper well heater 9.
As shown in Figure 4, the bottom of circulating line 7 is vertically installed with 4 supports of pipelines 5 respectively, and support of pipelines 5 uses for supporting circulating line 7, the quantity of support of pipelines 5 also can be 2 or 3, play a supporting role, but consider from stability, quantity is 4 the bests.The inner side of circulating line 7 is respectively equipped with several vent ports 8, equidistantly arranges between vent port 8.The outside of circulating line 7 is connected to nitrogen oxygen supply pipe 6, what export in nitrogen oxygen supply pipe 6 is the potpourri of nitrogen and oxygen, nitrogen supply (NS) pipe, oxygen supply pipe and conditioning equipment is connected to by art methods at the input end of nitrogen oxygen supply pipe 6, conveniently oxygen concentration can be regulated according to nitrogen oxygen gassing rate, realize oxygen concentration controlled, thus the object that the nitrogen oxygen ratio reaching the output of nitrogen oxygen supply pipe 6 is controlled.Nitrogen oxygen mixed gas accesses from nitrogen oxygen supply pipe 6, discharges from vent port 8 through circulating line 7.Shape due to circulating line 7 is identical with sample rack 4 and area that is circulating line 7 is greater than sample rack 4, sample rack 4 can be designed to circular or square, be preferably square, the standard size of square sample rack 4 is 10*10cm, therefore circulating line 7 needs to be centered around around sample rack 4, both shapes are identical, can form uniform nitrogen oxygen mixed gas environment around specimen holder 4.Circulating line 7 stands on base 1 by support of pipelines 5, circulating line 7 is positioned at the periphery of sample rack 4 and the central point of the central point of the upper surface of circulating line 7 and the upper surface of sample rack 4 coincides, namely circulating line 7 level is placed in the outside of sample rack 4, align with sample rack 4 top in the top of circulating line 7, and circulating line 7 and the central point of sample rack 4 are vertical corresponding.
Owing to being provided with concave station 14 at the upper surface of sample rack 4, sample is positioned at concave station 14.Circulating line 7 just in time keeps level with sample upper surface, nitrogen oxygen supply pipe 6 provides the nitrogen oxygen mixed gas of specific flow velocity to circulating line 7, by the vent port 8 horizontal direction ejection inside communicating pipe 7, around sample surfaces, form uniform nitrogen oxygen mixed gas environment, make sample in low oxygen concentration or oxygen-free environment, pyrolysis occur in the situation of being heated.In order to make the nitrogen oxygen mixed gas entering circulating line 7 that flow velocity direction can be kept in circulating line 7 consistent, forming annular steady flow condition, can the shape of circulating line 7 and sample rack 4 be all designed to square.The quantity of nitrogen oxygen supply pipe 6 is chosen as 2, two nitrogen oxygen supply pipes 6 lay respectively on cornerwise two summits of circulating line 7, and the airflow circulating direction of two nitrogen oxygen supply pipes 6 is identical, namely be all clockwise or be all counterclockwise, thus the better nitrogen oxygen mixed gas of formation circulates in circulating line 7.
Taper well heater 9 supports fixing by bracing frame 13, be positioned at the top of circulating line 7, be equally also positioned at the top of sample rack 4.Taper well heater 9 can be positioned at above sample rack 4 25mm place, the central point of taper well heater 9 is vertical corresponding with the central point of circulating line 7, namely vertical corresponding with the central point of sample rack 4.
In order to better test, can also comprise exhaust fume collecting hood 11, exhaust fume collecting hood 11 top is provided with smoke exhaust pipe 12.Exhaust fume collecting hood 11 can pass through support installing, and also can directly be lifted on ceiling 16, experimentally environmental selection is determined.Exhaust fume collecting hood 11 is for collecting the pyrolysis gas after sample pyrolysis, carried by smoke exhaust pipe 12 and discharge, smoke exhaust pipe 11 connects air exhauster 17, exhausting speed in smoke exhaust pipe 12 is kept to be 24L/s, make the pyrolysis gas of sample can enter gas analyzer by smoke exhaust pipe 12 with constant flow rate and carry out gas componant quantitative analysis, thus low oxygen concentration or the Non-oxygen pyrolytic product of sample can be analyzed.Exhaust fume collecting hood 11 is positioned at the top of taper well heater 9, and the central point of exhaust fume collecting hood 11 is vertical corresponding with the central point of taper well heater 9.In order to better collection, the diameter of exhaust fume collecting hood 11 end opening is greater than the suitable for reading of taper well heater 9, enters exhaust fume collecting hood 11 under being convenient to the suction function that sample pyrolysis gas produces at smoke extractor 17.In order to more convenient experimentation, thermal insulation board 15 can laterally be movably arranged on bracing frame 13, thermal insulation board 15 can rotate around bracing frame 13, the time under facilitating Quality control to be exposed to radiation source, when needed by thermal insulation board 15 between taper well heater 9 and circulating line 7.
During actual use, first determine air draft flow, all corrected normally by the other system of cone calorimetry, gas analyzer is adjusted.Power to spiral heating wire 10 thus open taper well heater 9; rotary sample on the concave station 14 of specimen holder 4, and the protection baffle plate placing thermal insulation board 15(taper well heater 9 above sample), scales/electronic balance weighing platform 2 resets; adjust balance, make a balance show sample net weight.Open nitrogen oxygen supply pipe 6; adjust flux; reach stationary value; after ensureing that work in every is accurately ready, remove the protection baffle plate of thermal insulation board 15(taper well heater 9), nitrogen oxygen mixed gas is discharged from the vent port 8 of circulating line 7; uniform and stable nitrogen oxygen mixed gas environment is formed at the upper surface of specimen holder 4; dilution oxygen concentration, reaches low oxygen concentration or oxygen-free environment, thus low oxygen concentration or Non-oxygen pyrolytic occur sample in nitrogen environment under infrared source heating.Under the effect of air exhauster 17, pyrolysis gas is discharged with exhaust fume collecting hood 11, and by being discharged in environment after filtering and purifying Purge gas.After experiment terminates, thermal insulation board 15 is moved to below taper well heater 9, after sample cooling, close nitrogen oxygen supply pipe 6, withdraw from specimen holder 4, close air exhauster 17.By this experimentation, cone calorimetry, gas analyzer etc. is utilized to analyze low oxygen concentration or the Non-oxygen pyrolytic product of sample.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; the just principle of the present invention described in above-described embodiment and instructions; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in claimed scope of the present invention.The protection domain of application claims is defined by appending claims and equivalent thereof.
Claims (6)
1. the low oxygen concentration environmental radiation heating experimental device for cone calorimetry, comprise base (1) and bracing frame (13), bracing frame (13) is vertically mounted on base (1), bracing frame (13) is provided with taper well heater (9), the inwall of taper well heater (9) is provided with spiral heating wire (10), it is characterized in that:
Described base (1) is placed with scales/electronic balance weighing platform (2), scales/electronic balance weighing platform (2) is provided with electronic balance support (3), electronic balance support (3) is provided with specimen holder (4), the bottom of circulating line (7) is vertically installed with 4 supports of pipelines (5) respectively, the inner side of circulating line (7) is respectively equipped with several vent ports (8), the outside of circulating line (7) is connected to nitrogen oxygen supply pipe (6), the shape of circulating line (7) is identical with sample rack (4) and area that is circulating line (7) is greater than sample rack (4), circulating line (7) stands on base (1) by support of pipelines (5), circulating line (7) is positioned at the periphery of sample rack (4) and the central point of the central point of circulating line (7) upper surface and sample rack (4) upper surface coincides, described taper well heater (9) is positioned at the top of circulating line (7), and the central point of taper well heater (9) is vertical corresponding with the central point of circulating line (7).
2. a kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry according to claim 1, it is characterized in that: also comprise exhaust fume collecting hood (11), exhaust fume collecting hood (11) top is provided with smoke exhaust pipe (12), exhaust fume collecting hood (11) is positioned at the top of taper well heater (9), and the central point of exhaust fume collecting hood (11) is vertical corresponding with the central point of taper well heater (9).
3. a kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry according to claim 1, it is characterized in that: the upper surface of described sample rack (4) is provided with concave station (14), the central point of concave station (14) is vertical corresponding with the central point of taper well heater (9).
4. a kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry according to claim 1, it is characterized in that: also comprise thermal insulation board (15), described thermal insulation board (15) is laterally movably arranged on bracing frame (13), and thermal insulation board (15) is positioned between taper well heater (9) and circulating line (7).
5. a kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry according to claim 1, it is characterized in that: described circulating line (7) and the shape of sample rack (4) are square, the quantity of described nitrogen oxygen supply pipe (6) is 2, and two nitrogen oxygen supply pipes (6) lay respectively on cornerwise two summits of circulating line (7) and the airflow circulating direction of two nitrogen oxygen supply pipes (6) is identical.
6. a kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry according to claim 2, is characterized in that: the diameter of described exhaust fume collecting hood (11) end opening is greater than the suitable for reading of taper well heater (9).
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| CN201510134083.8A CN104677939B (en) | 2015-03-25 | 2015-03-25 | A kind of low oxygen concentration environmental radiation heating experimental device for cone calorimetry |
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