Single combustible particle combustion characteristic testing device

Abstract

The utility model discloses a single combustible particle combustion characteristic testing device. The single combustible particle combustion characteristic testing device comprises a laser, a focusing lens, a reflecting mirror, a colorimetric measurement module, combustible particles, an ultrasonic transducer, an ultrasonic driving module and a computer, the ultrasonic driving module generates an ultrasonic control signal and drives the ultrasonic transducer to emit ultrasonic waves, the ultrasonic waves are reflected by the reflector to form standing waves, single combustible particles are suspended in the air, the laser emits pulse laser, the pulse laser is focused on the combustible particles after passing through the focusing lens, the particles are ignited, and the colorimetric measurement module measures the temperature of the combustible in real time. The single combustible particles are ultrasonically suspended, the temperature in the combustion process is measured in real time, the influence of background interference in traditional measurement can be overcome, and an experimental platform is provided for accurately analyzing the combustion process of the combustible.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the test measurement technical field relates to a single combustible particle combustion characteristic testing arrangement. BACKGROUND

[0002] Combustible particle combustion characteristics are closely related to factors such as particle shape, size, density, chemical composition, and environmental conditions. Accurate testing of combustible particle combustion characteristics has wide applications in many fields such as building, furniture, interior decoration materials, and energy utilization. For example, in the building field, by testing the combustion characteristics of building materials, the fireproof performance can be evaluated, and scientific basis can be provided for building design and material selection; in the energy utilization field, by testing the combustion characteristics of combustible materials such as biomass, the combustion process can be optimized, and the energy utilization efficiency can be improved. Since the traditional cone calorimeter lacks a suspension device, only the statistical information of the combustible particle group can be obtained, and it is difficult to analyze the influence of various factors on single particles. SUMMARY

[0003] To solve the above problems, the utility model discloses a single combustible particle combustion characteristic testing arrangement, which can suspend particles in the air and measure the temperature change of combustible materials in real time during the combustion process.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] The single combustible particle combustion characteristic testing arrangement comprises a laser, a focusing lens, a mirror, a colorimetric measurement module, a combustible particle, an ultrasonic transducer, an ultrasonic driving module, and a computer. The laser and the colorimetric measurement module are located on the two sides of the combustible particle. The laser emits pulsed laser, which is focused on the combustible particle after passing through the focusing lens. The measurement area of the colorimetric measurement module coincides with the focused light spot. The mirror is located above the combustible particle. The ultrasonic driving module provides the driving signal required by the ultrasonic transducer.

[0006] Further, the colorimetric measurement module comprises, from left to right, an imaging lens, a light splitting prism, a filter one waveband, and a detector one waveband. The filter two waveband and the detector two waveband are sequentially arranged below the light splitting prism.

[0007] Further, the mirror is a PMMA flat plate.

[0008] Further, the computer is installed with an analog-to-digital conversion card, which continuously collects the signals of the photoelectric detector in the colorimetric measurement module.

[0009] Further, the detector two waveband is a silicon photodiode with a response frequency higher than 1 kHz.

[0010] Further, the combustible particles are the measured objects, and the particle size is between 50 μm and 2 mm.

[0011] Further, the imaging lens has a transmittance higher than 80% in a 400 nm-1100 nm spectral range, and a focal length of 100 mm.

[0012] Further, the light splitting prism has a light splitting ratio of 1:1 in an 800 nm-1000 nm spectral range. Further, the filter one waveband is a narrow bandpass filter, and the center wavelength λ1 is 800 nm, and the passband half width is less than 30 nm.

[0013] Further, the detector one waveband is a silicon photodiode, and the response frequency is higher than 1 kHz.

[0014] The working principle of the utility model is:

[0015] The utility model uses ultrasonic transducer to form standing wave in air and oscillate combustible particles to air, and uses laser to ignite particles when the particles fall into standing wave potential well. The colorimetric measurement module uses two different waveband narrow band filters to select the measurement spectral range, and measures the light intensity in the spectral range, and obtains temperature analysis particle combustion characteristics based on blackbody radiation principle.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model uses ultrasonic suspension technology to suspend combustible particles in air, uses laser to ignite particles, and records temperature change in real time, can overcome the influence of background, analyzes the combustion characteristics of single particles, and provides an experimental platform for accurately analyzing the combustion process of combustible materials. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A single combustible particle combustion characteristic testing device structure schematic view is provided for the utility model.

[0019] Figure 2 A colorimetric measurement module structure schematic view is provided for the utility model.

[0020] LIST OF REFERENCE NUMERALS:

[0021] 1-laser, 2-focusing lens, 3-reflection mirror, 4-colorimetric measurement module, 5-combustible particles, 6-ultrasonic transducer, 7-ultrasonic driving module, 8-computer, 41-imaging lens, 42-light splitting prism, 43-filter one waveband, 44-detector one waveband, 45-filter two waveband, 46-detector two waveband. DETAILED DESCRIPTION

[0022] The present application will be further clarified by the following description and specific embodiments, which should be understood not to limit the scope of the present application. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a particular component.

[0023] As shown in Figure 1 The single combustible particle combustion characteristic testing device structure provided by the present application comprises a laser 1, a focusing lens 2, a reflecting mirror 3, a colorimetric measurement module 4, a combustible particle 5, an ultrasonic transducer 6, an ultrasonic drive module 7, and a computer 8. The laser and the colorimetric measurement module are respectively located on both sides of the combustible particle, and the focused light beam cannot directly enter the colorimetric measurement module. The measurement area of the colorimetric measurement module coincides with the focused light spot.

[0024] Specifically, the laser 1 is a pulse laser, the pulse width is in nanosecond level, the working wavelength is 1064 nm or 532 nm, and the pulse energy is above 1 mJ. A Nd:YAG laser can be used.

[0025] The focusing lens 2 has a transmittance higher than 90% at the working wavelength of the laser, and a focal length of 100 mm. The pulse parallel wave laser can be focused at the acoustic potential well.

[0026] The reflecting mirror 3 is a PMMA flat plate, which can reflect acoustic waves.

[0027] The colorimetric measurement module 4 has a structure as shown in Figure 2 The colorimetric measurement module 4 is composed of an imaging lens 41, a light splitting prism 42, a filter one waveband 43, a detector one waveband 44, a filter two waveband 45, and a detector two waveband 46.

[0028] The imaging lens 41 has a transmittance higher than 80% in the spectral range of 400 nm-1100 nm, and a focal length of 100 mm.

[0029] The light splitting prism 42 has a light splitting ratio of about 1:1 in the spectral range of 800 nm-1000 nm.

[0030] The filter one waveband 43 is a narrow-band band-pass filter, the center wavelength λ1 is 800 nm, and the passband half-width is less than 30 nm.

[0031] The detector one waveband 44 is a silicon photodiode, and the response frequency is higher than 1 kHz.

[0032] The filter two waveband 45 is a narrow-band band-pass filter, the center wavelength λ2 is 950 nm, and the passband half-width is less than 30 nm.

[0033] The wave band 46 of the detector 2 is a silicon photodiode, and the response frequency is higher than 1 kHz.

[0034] The combustible particle 5 is the object to be measured, and is a particle composed of combustible materials such as coal and wood, and the particle size is between 50 μm and 2 mm.

[0035] The ultrasonic transducer 6 has a working frequency of 40 kHz and a power higher than 50 W.

[0036] The ultrasonic driving module 7 can provide the driving signal required by the ultrasonic transducer 6.

[0037] The computer 8 is installed with an analog-digital conversion card, and can continuously collect the photoelectric detection signal. Assuming that the light intensities measured by the two wave bands are I(λ1) and I(λ2) respectively, the combustion temperature T can be expressed according to the blackbody radiation principle as

[0038]

[0039] In the formula, C2 is the second radiation constant.

[0040] A single combustible particle combustion characteristic testing device, and the working process is as shown in the figure. Figure 2 1. The ultrasonic transducer is turned on to generate a standing wave, the combustible particle sample is prepared, and the combustible particle is suspended in the air through ultrasonic oscillation, and the ultrasonic oscillation is stopped when the particle is suspended in the potential well of the focused light beam;

[0041] 2. The laser emits pulsed laser, and the computer continuously and synchronously collects the photoelectric signals of the two detectors;

[0042] 3. The time when the combustible particle is heated and combusted by the laser is determined according to the mutation of the photoelectric signal;

[0043] 4. The particle combustion temperature is calculated based on formula (1), and the temperature and time data are recorded in real time.

[0044] The technical means disclosed in the scheme of the present application is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features.

Claims

1. A device for testing the combustion characteristics of single combustible particles, characterized in that: The system includes a laser (1), a focusing lens (2), a reflector (3), a colorimetric measurement module (4), combustible particles (5), an ultrasonic transducer (6), an ultrasonic drive module (7), and a computer (8). The laser (1) and the colorimetric measurement module (4) are located on opposite sides of the combustible particles (5). The laser (1) emits pulsed laser light, which is focused onto the combustible particles (5) after passing through the focusing lens (2). The measurement area of ​​the colorimetric measurement module (4) coincides with the focused spot. The reflector (3) is located above the combustible particles (5); the ultrasonic drive module (7) provides the drive signal required by the ultrasonic transducer (6).

2. The single combustible particle combustion characteristic testing device according to claim 1, characterized in that: The colorimetric measurement module (4) includes, from left to right, an imaging lens (41), a beam splitter (42), a filter band (43), and a detector band (44); below the beam splitter (42), a filter band (45) and a detector band (46) are arranged in sequence.

3. The single combustible particle combustion characteristic testing device according to claim 1, characterized in that: The reflector (3) is a PMMA plate.

4. The single combustible particle combustion characteristic testing device according to claim 1, characterized in that: The computer (8) is equipped with an analog-to-digital converter card and continuously acquires signals from the photodetector in the colorimetric measurement module (4).

5. The single combustible particle combustion characteristic testing device according to claim 2, characterized in that: The detector's second band (46) is a silicon photodiode with a response frequency higher than 1 kHz.

6. The single combustible particle combustion characteristic testing device according to claim 1, characterized in that: Combustible particles (5) are the objects to be measured, with a particle size between 50 μm and 2 mm.

7. The single combustible particle combustion characteristic testing device according to claim 2, characterized in that: The imaging lens (41) has a transmittance of over 80% in the spectral range of 400nm-1100nm and a focal length of 100mm.

8. The single combustible particle combustion characteristic testing device according to claim 2, characterized in that: The beam splitter (42) has a beam splitting ratio of 1:1 in the 800nm-1000nm spectral range.

9. The single combustible particle combustion characteristic testing device according to claim 2, characterized in that: The first band of the filter (43) is a narrow bandpass filter with a center wavelength λ1 of 800nm ​​and a passband half width of less than 30nm.

10. The single combustible particle combustion characteristic testing device according to claim 2, characterized in that: The detector band (44) is a silicon photodiode with a response frequency higher than 1kHz.

Images