A method for testing the purification efficiency of vehicle volatile organic compounds at high temperatures

Abstract

The present invention provides a method for testing the purification efficiency of vehicle volatile organic compounds at high temperatures, which includes the following steps: S1: Assemble the samples to be tested in the vehicle inside a five-cubic-meter chamber according to the actual situation, and adjust the parameters of the samples inside the vehicle; S2: Set up a sampling component inside the five-cubic-meter chamber, connect the sampling component to the testing component, and seal the samples inside the vehicle; S3: Define the parameters of the five-cubic-meter chamber, turn on the testing component, and collect the gas as the purification basic concentration value; S4: Turn on the samples to be tested in the vehicle, turn on the testing component, and collect the gas as the final concentration value; S5: Draw a curve based on the test results of step S3 and step S4 to obtain the purification efficiency of each volatile organic compound. The method for testing the purification efficiency of vehicle volatile organic compounds at high temperatures according to the present invention can conduct tests on the purification performance of volatile organic compounds inside the vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of in-vehicle air quality, and particularly relates to a method for testing the purification efficiency of vehicle volatile organic compounds at high temperature. Background Art

[0002] The air quality in vehicles has attracted more and more extensive attention from vehicle manufacturers and consumers, etc. At present, the technical route of improving the in-vehicle air quality by reducing the emissions of interior trim is relatively mature, and each vehicle enterprise has established a corresponding standard management system. However, this technical route has certain drawbacks, and the emissions of interior trim cannot be reduced to "zero". With the upgrading of the demand for the health of the in-vehicle environment at the consumer end, the in-vehicle air quality has faced new challenges. In order to meet the demand improvement at the consumer end, vehicle enterprises have added air purification functions to their models. At present, there is only a test method for the purification performance of in-vehicle particulate matter in the industry. However, the objects of purification of the multi-effect air filters, negative ion purification, photocatalytic purification, etc. installed in vehicles by vehicle enterprises are volatile organic compounds. Therefore, the existing test methods have limitations.

[0003] However, this evaluation method has the following three disadvantages:

[0004] 1. This method is not applicable to the test of the purification performance of volatile organic compounds;

[0005] 2. This method can only use the whole vehicle for testing, and it is impossible to carry out test verification during the vehicle model R & D stage;

[0006] 3. This method only considers the purification effect of the air filter, and lacks a test method combining other purification functions in the vehicle. Summary of the Invention

[0007] In view of this, the present invention aims to propose a method for testing the purification efficiency of vehicle volatile organic compounds at high temperature to solve the problems of not being applicable to the test of the purification performance of volatile organic compounds, being unable to carry out test verification during the vehicle model R & D stage, and lacking a test method combining other purification functions in the vehicle.

[0008] To achieve the above object, the technical solution of the present invention is realized as follows:

[0009] The object of the present invention is achieved by the following measures. The main equipment used is a five-cubic-meter chamber, an FID detector, a gas chromatograph-mass spectrometer, and a high-performance liquid chromatograph.

[0010] First, place the interior trim of the vehicle, non-metallic components inside the vehicle, air-conditioning assembly, and in-vehicle purification components in the five-cubic-meter chamber according to the actual assembly state, assembly position, and assembly sequence of the whole vehicle. Connect the power supply cables of the air conditioner and in-vehicle purification components to the outside of the chamber through the connection ports of the five-cubic-meter chamber, and set the parameters of the air conditioner and in-vehicle purification components. Arrange the sampling catheter at the midpoint of the connection line between the headrests of the front two seats, and then seal the chamber door. Connect the sampling catheter to the sampling pump and FID detector; set the parameters of the five-cubic-meter chamber: temperature 23°C, relative humidity 50%, and set the operating program of the five-cubic-meter chamber: ventilation time 360 min, sealing time 960 min. Click the start button of the five-cubic-meter chamber to start running. After the temperature and humidity reach the set values, the operating program will start automatically, and at the same time, turn on the FID detector. After the program runs to completion, collect the TENAX and DNPH sampling tubes. Use a thermal desorption gas chromatography-mass spectrometry instrument and a high-performance liquid chromatography instrument to measure the concentration of volatile organic compounds, and this concentration is used as the purification basic concentration value;

[0011] Then connect the power supply of the air conditioner and the in-vehicle purification components to start purifying the air in the chamber. At this time, the FID detector is in the detection state. After the purification concentration reaches equilibrium, turn off the power supply of the air conditioner and the in-vehicle purification components, and collect the TENAX and DNPH sampling tubes. Use a thermal desorption gas chromatography-mass spectrometry instrument and a high-performance liquid chromatography instrument to measure the concentration of volatile organic compounds, and this concentration is used as the purification final concentration value;

[0012] Finally, analyze the FID detection results and draw the FID curve. The moment when the derivative is zero during the decline of the curve is the "purification equilibrium time", and the "purification efficiency" of each volatile organic compound is obtained by analyzing the concentration of volatile organic compounds.

[0013] The calculation formula for the purification efficiency of volatile organic compounds at high temperature is:

[0014]

[0015] Where:

[0016] η i - The purification efficiency of this volatile organic compound, μg / cm 3 / min;

[0017] C iZ - The concentration of this volatile organic compound before purification, μg / cm 3 ;

[0018] C iS - The concentration of this volatile organic compound after purification, μg / cm 3 ;

[0019] T - The time when the FID value reaches equilibrium during the purification process, min;

[0020] a i- The high-temperature volatilization coefficient of this volatile organic compound, dimensionless;

[0021] b i - The influence coefficient of the air temperature inside the vehicle, dimensionless.

[0022] Table 1 High-temperature volatilization coefficient of pentaphenyl trialdehyde

[0023]

[0024] Table 2 Influence coefficient of temperature

[0025]

[0026] Table 3 Air-conditioning parameters and parameters of in-vehicle purification components

[0027]

[0028] Compared with the prior art, the method for testing the purification efficiency of vehicle volatile organic compounds at high temperature according to the present invention has the following beneficial effects:

[0029] 1. Using the method of the present invention, the purification performance of volatile organic compounds inside the vehicle can be tested.

[0030] 2. Using the method of the present invention, not only can the purification performance of volatile organic compounds inside the vehicle be tested by simulating the emission inside the vehicle using interior trim during the R & D stage of the vehicle; but also the purification performance of the vehicle on volatile organic compounds inside the vehicle can be directly tested during the mass production stage of the vehicle.

[0031] 3. This method takes into account the purification effect of the air-conditioning filter, and based on the actual situation in the test, it can test the comprehensive purification performance of the vehicle on volatile organic compounds inside the vehicle after all purification test components are turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0033] Figure 1 It is a schematic diagram inside the five-cubic-meter chamber described in the embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of the FID curve described in the embodiment of the present invention.

[0035] Description of the reference numerals:

[0036] 1. Five-cubic-meter chamber; 2. Automotive air conditioner and in-vehicle purification components; 3. Interior trim inside the vehicle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which the present invention pertains. The test reagents used in the following embodiments are all conventional biochemical reagents unless otherwise specified; the experimental methods are all conventional methods unless otherwise specified.

[0038] The present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0039] Example 1:

[0040] The five-cubic-meter chamber 1 should be purified before use to ensure that the toluene in the chamber is ≤ 0.02 mg / m 3 and the formaldehyde is ≤ 0.02 mg / m 3 . Place the vehicle interior trim 3, non-metallic components in the vehicle, the air-conditioning assembly, and the vehicle-mounted purification components in the five-cubic-meter chamber 1 according to the actual assembly state, assembly position, and assembly sequence of the whole vehicle. Connect the air-conditioning power cord and the power cord of the vehicle-mounted purification component to the outside of the chamber through the connection port of the five-cubic-meter chamber 1, and set the parameters of the air-conditioning and the vehicle-mounted purification component. The volatile organic compounds in the vehicle come from the emission of non-metallic components in the vehicle, and different assembly positions will also affect the emission of volatile organic compounds. Therefore, the premise of using this invention is to arrange all the non-metallic components in the vehicle according to the actual assembly position of the whole vehicle. In addition, the non-emitting surfaces of the non-metallic components should also be covered with non-emitting materials such as aluminum foil to make the state of the non-metallic components closest to the actual assembly state of the whole vehicle. After arranging the sampling conduit at the midpoint of the connection line of the front two seat headrests, seal the chamber door, and connect the sampling conduit to the sampling pump and the FID detector; set the parameters of the five-cubic-meter chamber 1: temperature 23 °C, relative humidity 50%, and set the operating program of the five-cubic-meter chamber 1: ventilation time 360 min, sealing time 960 min. The FID detector should be calibrated with zero gas and standard gas before use, and the measuring range is selected as 0 - 10 ppm, which is suitable for the test of volatile organic compounds in the vehicle. Click the start operation button of the five-cubic-meter chamber 1. After the temperature and humidity reach the set values, the operating program will start automatically, and at the same time, the FID detector will be turned on. After the program runs to completion, collect the TENAX and DNPH sampling tubes, and the sampling parameters are: TENAX tube: 200 mL / min, 30 min; DNPH tube: 500 mL / min, 30 min. Use a thermal desorption gas chromatography-mass spectrometry instrument to measure the toluene concentration.

[0041] Then connect the air-conditioning power supply and the power supply of the vehicle-mounted purification component to start purifying the air in the chamber. At this time, the FID detector is in the detection state. After 12 min, turn off the air-conditioning power supply and the power supply of the vehicle-mounted purification component, collect the TENAX and DNPH sampling tubes, and the sampling parameters are: TENAX tube: 200 mL / min, 30 min; DNPH tube: 500 mL / min, 30 min. Use a thermal desorption gas chromatography-mass spectrometry instrument to measure the toluene concentration.

[0042] According to the FID curve, the purification equilibrium time T is 12 min, and the toluene concentration C_toluene_Z before purification is 13 μg / m 3 , the high-temperature volatilization coefficient a_toluene of toluene is 1.6, the air temperature in the vehicle is 40 °C, and the corresponding temperature influence coefficient b is 0.9. The toluene concentration C_toluene_S after purification is 6 μg / m 3 , and the calculated purification efficiency η_toluene of toluene at high temperature is 1.11 μg / cm 3 / min.

[0043] Example 2

[0044] The five-cubic-meter chamber 1 should be purified before use to ensure that the toluene in the chamber is ≤ 0.02 mg / m 3 , and the formaldehyde is ≤ 0.02 mg / m 3 . Place the vehicle interior 3, non-metallic components in the vehicle, air-conditioning assembly, and vehicle-mounted purification components in the five-cubic-meter chamber 1 according to the actual assembly state, assembly position, and assembly sequence of the whole vehicle. Connect the air-conditioning power cord and the vehicle-mounted purification component power cord to the outside of the chamber through the connection port of the five-cubic-meter chamber 1, and set the parameters of the air-conditioning and vehicle-mounted purification components. The volatile organic compounds in the vehicle come from the emission of non-metallic components in the vehicle, and different assembly positions will also affect the emission of volatile organic compounds. Therefore, the prerequisite for using this invention is to arrange all the non-metallic components in the vehicle according to the actual assembly position of the whole vehicle. In addition, the non-emitting surface of the non-metallic components should also be covered with non-emitting materials such as aluminum foil to make the state of the non-metallic components closest to the actual assembly state of the whole vehicle. After arranging the sampling catheter at the midpoint of the connection line of the front two seat headrests, seal the chamber door, and connect the sampling catheter to the sampling pump and FID detector; set the parameters of the five-cubic-meter chamber 1: temperature 23 °C, relative humidity 50%, and set the operating program of the five-cubic-meter chamber 1: ventilation time 360 min, closed time 960 min. The FID detector should be calibrated with zero gas and standard gas before use, and the range is selected as 0 - 10 ppm, which is suitable for testing volatile organic compounds in the vehicle. Click the start operation button of the five-cubic-meter chamber 1. After the temperature and humidity reach the set values, the operating program will start automatically, and the FID detector will be turned on at the same time. After the program runs, collect the TENAX and DNPH sampling tubes, and the sampling parameters are: TENAX tube: 200 mL / min, 30 min; DNPH tube: 500 mL / min, 30 min. Use a high-performance liquid chromatography instrument to measure the formaldehyde concentration.

[0045] Then connect the power supply of the air conditioner and the in-vehicle purification component to start purifying the air in the cabin. At this time, the FID detector is in the detection state. After 12 minutes, turn off the power supply of the air conditioner and the in-vehicle purification component, and collect the TENAX and DNPH sampling tubes. The sampling parameters are as follows: for the TENAX tube: 200 mL / min, 30 minutes; for the DNPH tube: 500 mL / min, 30 minutes. Use a high-performance liquid chromatograph to measure the formaldehyde concentration.

[0046] According to the FID curve, the purification equilibrium time T is 11 minutes, and the formaldehyde concentration C before purification is 21 μg / m 3 , the high-temperature volatilization coefficient a of formaldehyde is 3.8, the corresponding temperature influence coefficient b at the in-vehicle air temperature of 42°C is 0.9, and the formaldehyde concentration C after purification is 7 μg / m 3 , and the calculated purification efficiency η of formaldehyde at high temperature is 5.46 μg / cm 3 / min.

[0047] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for testing the purification efficiency of vehicle volatile organic compounds at high temperatures, characterized in that: The steps include: S1: Place the interior decoration, non-metallic parts, air conditioning assembly and vehicle purification components that need to be tested in the vehicle in the five-cubic cabin according to the actual assembly state, assembly position and assembly sequence of the vehicle, and set the parameters of the air conditioning and vehicle purification components; S2: Set up a sampling assembly in the five-cubic-meter cabin, connect the sampling assembly to the test assembly, and seal the sample in the vehicle; S3: Define the parameters of the five cubic chambers, open the test components, and collect gas as the purification basic concentration value; The step S3 also includes clicking the five cubic cabin start button, automatically starting the program after the temperature and humidity reach the set value, and turning on the FID detector at the same time. After the program is completed, the sampling tube is collected, and the concentration of volatile organic compounds is measured using a thermal desorption gas chromatograph and a high performance liquid chromatograph, and this concentration is used as the purification basic concentration value; S4: Open the sample to be tested in the vehicle, open the test assembly, and collect the gas as the final concentration value; the step S4 includes then connecting the sample to be tested in the vehicle, starting to purify the air in the cabin, at which time the FID detector is in a detection state, and after the purification concentration reaches equilibrium, turning off the power of the air conditioner and the power of the vehicle-mounted purification component, collecting the sampling tube, and using a thermal desorption gas chromatograph and a high performance liquid chromatograph to determine the concentration of volatile organic compounds, and this concentration is used as the final purification concentration value; In the step S4, a FID curve is drawn according to the analysis of the FID detection results, and the moment when the derivative of the curve is zero during the downward process is the purification equilibrium time. The purification efficiency of each volatile organic compound is obtained by analyzing the concentration of volatile organic compounds; S5: Draw a curve according to the test results of step S3 and step S4 to obtain the purification efficiency of each volatile organic compound; The calculation method of the purification efficiency is: Among them, η i - Purification efficiency of the volatile organic compound, μg / cm 3 / min; - Concentration of volatile organic compounds before purification, μg / cm 3 ; - Concentration of the purified volatile organic compounds, μg / cm 3 ; T-time for the FID value to reach equilibrium during purification, min; a i - The high-temperature volatilization coefficient of this volatile organic compound, dimensionless; b i -Coefficient of influence of in-vehicle air temperature, dimensionless.

2. According to claim 1, a method for testing the purification efficiency of volatile organic compounds in a vehicle at high temperature is characterized in that: in the step S1, adjusting the parameters of the sample in the vehicle includes connecting the air-conditioning power cord and the power cord of the vehicle-mounted purification component to the outside of the cabin through the five-cubic cabin connection port, and setting the parameters of the air-conditioning and vehicle-mounted purification components.

3. A method for testing the purification efficiency of vehicle volatile organic compounds at high temperatures according to claim 1, characterized in that: The sampling assembly in step S2 includes a sampling tube and a sampling pump, and the sampling pump is arranged on the sampling tube; The test assembly includes an FID detector, one end of a sampling tube is disposed in a five-cubic cabin, and the other end is connected to the FID detector; Place the sampling tube at the midpoint of the line connecting the two front seat headrests and seal the cabin door.

4. A method for testing the purification efficiency of vehicle volatile organic compounds at high temperatures according to claim 1, characterized in that: In step S3, the parameters of the five cubic cabins are a temperature of 23° C. and a relative humidity of 50%, and the parameters of the five cubic cabin operation program are a ventilation time of 360 minutes and a sealing time of 960 minutes.

5. A method for testing the purification efficiency of vehicle volatile organic compounds at high temperatures according to claim 1, characterized in that: The samples that need to be tested in the vehicle include the air-conditioning power supply and the vehicle-mounted purification component power supply.

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