Intelligent test system and performance test method for chemical filter for various gaseous pollutants

Abstract

The invention discloses an intelligent test system and a performance test method for a chemical filter for various gaseous pollutants, and relates to the technical field of gas detection. The flow adjusting device is connected behind the air inlet system, the air pre-filtering device is connected behind the flow adjusting device, the to-be-tested sample piece is connected behind the air pre-filtering device, and the gaseous pollutant generating device and the temperature and humidity control device are connected between the air pre-filtering device and the to-be-tested sample piece. A gas pollutant detection device and a pressure testing device are respectively connected to a to-be-tested sample piece, a tail gas treatment device is connected behind the to-be-tested sample piece, a flow monitoring device is connected behind the tail gas treatment device, an exhaust system is connected behind the flow monitoring device, and a first timing motor and a second timing motor are respectively connected with the above devices. According to the invention, a basis is provided for better evaluating the performance test of purification devices such as an air purifier filter element, an automobile filter, an engine room and an electronic clean workshop chemical filter, so that the test is more practical, intelligent and humanized.

Description

Technical Field

[0001] The invention belongs to the technical field of gas detection, and more specifically, relates to an intelligent testing system and a performance testing method for chemical filters of multiple gaseous pollutants. Background Art

[0002] At present, there are many kinds of indoor gaseous pollutants in buildings, car cabins, enclosed engine cabins, and electronic clean workshops, which have certain impacts on human health and production processes. In order to reduce the concentration level of gaseous pollutants in a closed environment, it is necessary to purify the gaseous pollutants. The commonly used method for purifying gaseous pollutants is adsorption purification technology. Considering the economy and practicality, chemical filters containing porous adsorption materials are used to purify gaseous pollutants. However, chemical filters with different performances have different purification effects on different gaseous pollutants. In order to better purify different gaseous pollutants, it is necessary to evaluate the performance of chemical filters with different porous adsorption materials to meet the needs.

[0003] At present, there are various filtration test standards for indoor air purifier filter elements, automobile filters, cabin chemical filters, and chemical filter materials and devices for electronic clean workshops. Some standards directly evaluate the performance of air purifiers, and propose detection and evaluation methods for the clean air volume CADR and cumulative purification volume CCM of mixed component gaseous pollutants, but do not specifically stipulate the purification performance test of the filter element in the air purifier. There are also domestic standards that make relevant provisions for the filtration test of gases by air filters used in passenger compartments. In addition, the International Organization for Standardization has made corresponding provisions for the test methods and relevant requirements for the performance of gas purification materials and devices for general ventilation. However, due to the different performance evaluation standards currently in existence, their test environments, experimental conditions, test indicators, chemical filter structures, etc. are different, and the laboratory test operation steps are relatively cumbersome. In order to more intelligently evaluate the purification performance of various gaseous pollutants of different types of chemical filters in a unified manner, it is necessary to develop an intelligent test system for chemical filters of various gaseous pollutants.

[0004] In summary, in order to better ensure that air purifier filters, automobile filters, cabin chemical filters, and electronic clean room chemical filters meet people's usage needs, it is imperative to stipulate and strictly implement the test methods for the performance of the above purification devices. Among them, the test of the gaseous pollutant filtration efficiency and cumulative purification volume / pollution capacity of the purification device is continuous sampling at different times, and the integral method is used to calculate the cumulative purification volume / pollution capacity. The above two performance parameters are explained separately. In order to make the entire test process more humane and avoid harm to the human body caused by gaseous pollutants, an intelligent testing system is required. In order to make the test data more accurate, the performance of instruments and equipment, the combination of samples of different shapes to be tested and the pipeline system, and the data processing method are standardized. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an intelligent testing system and performance testing method for chemical filters of various gaseous pollutants, which provides a basis for better evaluating the performance testing of purification devices such as air purifier filter elements, automobile filters, cabin chemical filters, and electronic clean room chemical filters, making the testing more practical, intelligent and humane, and providing useful information for people to choose purification devices.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: an intelligent testing system for chemical filters of multiple gaseous pollutants, including an air intake system, a flow regulating device, an air pre-filtering device, a gaseous pollutant generating device, a temperature and humidity control device, a sample to be tested, a gaseous pollutant detecting device, a pressure testing device, an exhaust gas treatment device, a flow monitoring device, an exhaust system, a first timing motor, and a second timing motor. According to the flow direction of the gas to be detected, the flow regulating device is connected to the pipeline behind the air intake system, the air pre-filtering device is connected to the pipeline behind the flow regulating device, the sample to be tested is connected to the pipeline behind the air pre-filtering device, and the gaseous pollutants are detected. The gaseous pollutant generating device and the temperature and humidity control device are connected to the pipeline between the air pre-filtration device and the sample to be tested, the gaseous pollutant detection device and the pressure testing device are respectively connected to the upstream and downstream pipe sections of the sample to be tested, the pipeline behind the sample to be tested is connected to the exhaust gas treatment device, the pipeline behind the exhaust gas treatment device is connected to the flow monitoring device, and the pipeline behind the flow monitoring device is connected to the exhaust system. The first timing motor controls the air intake system, the gaseous pollutant generating device and the gaseous pollutant detection device, and the second timing motor controls the flow regulating device, the air pre-filtration device, the temperature and humidity control device, the pressure testing device, the exhaust gas treatment device, the flow monitoring device and the exhaust system.

[0007] Preferably, the experiment of this test system should be carried out in a closed test pipe with an ambient temperature of (23±3)℃, a relative humidity of 50±3%, no external airflow, strong sunlight and other radiation effects; the acceptable internal dimensions of the test pipe are 300×300mm-610×610mm, and the length of the straight pipe section of the test section is greater than the internal dimensions of the pipe, retaining a straight pipe section of at least 3 times the pipe diameter; the test pipe should be leak tested every year to check the sealing of the pipe, and the leakage is required to be <100L / min under a pressure of 500Pa; the air volume of the test system should be the rated air volume of the air purifier, automobile filter, cabin chemical filter and electronic clean room chemical filter where the device is located, ranging from 150m3 / h to 4000m3 / h.

[0008] Preferably, the gaseous pollutant detection device can use online equipment, ammonia detection can use chemiluminescence; sulfur dioxide detection can use UV fluorescence method; formaldehyde detection can use photoacoustic spectroscopy PAS, controlled potential electrolysis (CPE) technology equipment; toluene detection can use photoionization detector PID or flame ionization detector FID or ultraviolet absorption UV technology; non-online equipment can also be used, such as gas adsorption tube SOR, Tenax tube sampling GC-MS.

[0009] Preferably, the test system must ensure the uniformity of the airflow and the stability of the gas before the test sample is installed;

[0010] To determine the uniformity of the airflow, at least nine sampling locations must be scanned. The cross section can be divided into nine equal squares, and a positioning probe is used to sample at the center of each square. At each sampling location, the deviation between the test value of the gaseous pollutant and the average value does not exceed ±5%;

[0011] The test of gas flow stability must be checked with any mass flow controller used for gas measurement, under the specified test gas concentration and only 10% of the concentration. The cross section is divided into four rectangles. At the center point of the cross section and between the center point and the edge of the opening, the five-point method is used on the same plane as the sample to be tested. Each sampling point is sampled at least three times, and the average value is taken as the reading at the point. Compare these five average concentrations, distributed upstream and downstream of the sample to be tested, to ensure that the deviation does not exceed ± 5%.

[0012] A method for intelligent performance testing of chemical filters for multiple gaseous pollutants, comprising the following steps:

[0013] First, pretreatment is carried out. The air intake system is started, and the temperature and humidity control device, flow control device and flow monitoring device are turned on. Clean air with appropriate flow, temperature and relative humidity is introduced for pretreatment. The gas passes through the flow control device, air pre-filter device, sample to be tested, exhaust gas treatment device, flow monitoring device in turn, and finally is discharged from the pipeline through the exhaust system. Until the temperature and humidity of the gas passing through the equipment are stable. The pressure drop of the sample to be tested under the rated air volume should be measured and recorded. In addition, the relationship between the pressure drop and the flow rate should be tested and recorded at 50%, 75%, 100% and 125% of the rated air volume.

[0014] Then, the corresponding performance test is carried out: the gaseous pollutant generating device is turned on and adjusted, and the temperature and humidity in the test pipeline are monitored by the temperature and humidity control device to reach the target value of the test environment. The gaseous pollutant detection device is used to monitor the concentration of pollutants upstream of the test sample, and when it reaches the recommended maximum load concentration allowed for different performance tests, the polluted gas is continuously introduced, and the performance test of the test sample is carried out. The sampling is continuously carried out upstream and downstream of the test sample for the preset time, and finally the gas purification efficiency and cumulative purification volume / pollutant capacity test of the test sample is completed;

[0015] Finally, the experiment is stopped. The first timing motor turns off the gaseous pollutant generating device first. After the gaseous pollutants are exhausted, that is, the gaseous pollutant detection device shows 0, the gaseous pollutant detection device is turned off, and finally the air intake system is turned off. After the above instruments are turned off for 10 minutes, the second timing motor turns off the flow regulating device, temperature and humidity control device, pressure testing device, flow monitoring device and exhaust system.

[0016] Preferably, the experimental method for gaseous pollutant purification efficiency of the sample to be tested includes the following contents: starting the air intake system 1, adjusting the flow regulating device to pass a suitable flow, the air introduced before the experiment is filtered by the air pre-filter device so that the background concentration of particles with a particle size of more than 0.3 μm in the air is less than 1000 / L, and the background concentration of the gaseous target pollutant to be tested is less than 10ppb, and at the same time starting the temperature and humidity control device to make the temperature and humidity in the pipeline reach the specified state; adjusting the flow regulating device until the flow detection device reaches the rated flow of the sample to be tested; the gas purity generated by the gaseous pollutant generating device is greater than 99% or above the secondary standard gas, at this time, the gaseous pollutant generating device is turned on, and the pollutant concentration is continuously introduced until the pollutant concentration reaches the recommended maximum allowable load concentration, and sampling is performed at the upstream and downstream of the installed sample to be tested respectively, and the gas is tested. A fixed flow of air is drawn out from the channel to the gaseous pollutant detection device; sampling is performed every 10 seconds, or at the fastest frequency allowed by the gaseous pollutant detection device; the gas concentration is continuously detected until the gas concentration downstream of the sample to be tested reaches 95% of the specific percentage of the upstream concentration or the predetermined experimental time is reached, and the termination time is recorded; the experiment is terminated, and the first timing motor: first, the gaseous pollutant generating device is turned off, and after the gaseous pollutants are emptied, that is, the gaseous pollutant detection device shows 0, the gaseous pollutant detection device is turned off, and finally the air intake system is turned off; after the above instruments are turned off for 10 minutes, the second timing motor turns off the flow regulating device, the temperature and humidity control device, the pressure testing device, the flow monitoring device and the exhaust system, and the computer calculates the gaseous pollutant filtration efficiency using the concentration data through the corresponding filtration efficiency calculation formula.

[0017] Preferably, the gaseous pollutant filtration efficiency calculation formula is:

[0018]

[0019] E: filtration efficiency; C1: the concentration of pollutants located upstream of the sample to be tested; C2: the concentration of pollutants located downstream of the sample to be tested.

[0020] Preferably, the test method for the cumulative purification amount / pollution holding capacity of the gaseous pollutants to be tested includes the following contents: starting the air intake system, adjusting the flow regulating device to pass a suitable flow, filtering the air introduced before the experiment through an air pre-filter device so that the background concentration of particles with a particle size of more than 0.3 μm in the air is less than 1000 particles / L, and the background concentration of the gaseous target pollutants to be tested is less than 10ppb, and at the same time starting the temperature and humidity control device to make the temperature and humidity in the pipeline reach the specified state; adjusting the flow regulating device until the flow detection device reaches the rated flow of the sample to be tested; the gas purity generated by the gaseous pollutant generating device is greater than 99% or above the secondary standard gas, then turning on the gaseous pollutant generating device, and waiting for the pollutant concentration to reach the maximum load concentration recommended at this time, continuously passing the pollutants. The polluted gas is sampled regularly upstream of the installation of the sample to be tested, and is sampled continuously downstream of the installation of the sample to be tested, and a gaseous pollutant purification efficiency experiment is conducted on the sample to be tested. The test time is 15 hours, and the experiment is terminated; the first timing motor: first turn off the gaseous pollutant generating device, and after the gaseous pollutants are emptied, that is, the gaseous pollutant device shows 0, turn off the gaseous pollutant detection device, and finally turn off the air intake system; after the above instruments are turned off for 10 minutes, the second timing motor turns off the flow regulating device, temperature and humidity control device, pressure testing device, flow monitoring device and exhaust system; the computer calculates the filtration efficiency through the corresponding test data, and finally draws a curve of the filtration efficiency of the sample to be tested for gaseous pollutants changing with time, and calculates the cumulative purification amount of gaseous pollutants of the sample to be tested.

[0021] Preferably, the calculation formula for the cumulative purification amount of gaseous pollutants is:

[0022]

[0023] m c :Measure the cumulative purification amount of pollutants caused by the sample to be tested;

[0024] m t : The total mass of contamination acting on the sample to be tested;

[0025] Note: The cumulative purification volume is the total mass of gaseous pollutants removed from the sample to be tested during an estimated test time of about 15 hours, in mg. The test time may be appropriately changed according to the actual effect of the sample to be tested.

[0026] The beneficial effects of adopting the above technical solution are:

[0027] 1. The present invention provides a basis for better evaluating the performance test of purification devices such as air purifier filter elements, automobile filters, cabin chemical filters, and electronic clean room chemical filters. The test is more practical, intelligent, and humane, providing useful information for people to choose purification devices.

[0028] 2. For experiments on purification efficiency of various gaseous pollutants and cumulative purification capacity / pollution holding capacity of chemical filters with various shapes, rated air volumes and functions, the present invention realizes comprehensive, rapid and intelligent testing, calculation and comparative analysis of the test performance of different chemical filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the combination of the plate-type test sample and the pipeline system;

[0031] Figure 3 It is a schematic diagram of the combination of the cylindrical sample to be tested and the pipeline system;

[0032] Figure 4 It is a schematic diagram of the combination of the triangular sample to be tested and the pipeline system;

[0033] Figure 5 It is a curve diagram showing the variation of the filtration efficiency of the sample to be tested for gaseous pollutants over time;

[0034] Figure 6 Flowchart of intelligent testing system for samples to be tested;

[0035] In the figure: 1. Air intake system; 2. Flow regulating device; 3. Air pre-filtration device; 4. Gaseous pollutant generating device; 5. Temperature and humidity control device; 6. Sample to be tested; 7. Gaseous pollutant detection device; 8. Pressure testing device; 9. Exhaust gas treatment device; 10. Flow monitoring device; 11. Exhaust system; 12. First timing motor; 13. Second timing motor. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] like Figure 1As shown, the test system includes an intake system 1, a flow regulating device 2, an air pre-filtering device 3, a gaseous pollutant generating device 4, a temperature and humidity control device 5, a sample to be tested 6, a gaseous pollutant detecting device 7, a pressure testing device 8, an exhaust gas treatment device 9, a flow monitoring device 10, an exhaust system 11, a first timing motor 12, and a second timing motor 13. According to the flow direction of the gas to be detected, the flow regulating device 2 is connected to the pipeline behind the intake system 1, the air pre-filtering device 3 is connected to the pipeline behind the flow regulating device 2, the sample to be tested 6 is connected to the pipeline behind the air pre-filtering device 3, and the gaseous pollutant generating device 4 and the temperature and humidity control device 5 are connected. On the pipeline between the air pre-filter device 3 and the sample to be tested 6, a gas pollutant detection device 7 and a pressure testing device 8 are respectively connected to the sample to be tested 6, the pipeline behind the sample to be tested 6 is connected to an exhaust gas treatment device 9, the pipeline behind the exhaust gas treatment device 9 is connected to a flow monitoring device 10, and the pipeline behind the flow monitoring device 10 is connected to an exhaust system 11. The first timing motor 12 controls the air intake system 1, the gaseous pollutant generating device 4 and the gas pollutant detection device 7, and the second timing motor 13 controls the flow regulating device 2, the air pre-filter device 3, the temperature and humidity control device 5, the pressure testing device 8, the exhaust gas treatment device 9, and the flow monitoring device 10.

[0038] The experiment of the present invention should be carried out in a closed test pipeline with an ambient temperature of (23±3)℃, a relative humidity of 50±3%, no external airflow, no strong sunlight and other radiation effects. The acceptable internal dimensions of the test pipeline are 300×300mm to 610×610mm, ensuring that the actual (complete) size of devices such as air purifier filter elements, automobile filters, cabin chemical filters, and electronic clean room chemical filters must always be tested. The length of the straight pipe section of the test section should be greater than the internal dimensions of the pipeline, and at least 3 times the diameter of the straight pipe section should be retained. Ensure that the airflow before and after the air purifier filter element is stable. The test pipeline should be leak tested every year to check the sealing of the pipeline, and the leakage is required to be <100L / min under a pressure of 500Pa. The air volume of the test system should be the rated air volume of the air purifier, automobile filter, cabin chemical filter, electronic clean room chemical filter, etc. where the device is located, and the range is about 150m 3 / h~4000m 3 / h. During the experimental test, ensure that the airflow before and after the device is stable, and the airflow should be evenly mixed, and the airtightness of the test system meets the above requirements.

[0039] The main pollutants and their concentrations of the present invention are shown in Table 1:

[0040] Table 1 Main pollutants and their maximum test concentrations

[0041]

[0042] Before measuring the performance of the sample to be tested, the experimental system should be pre-treated with clean air without pollutants at an appropriate flow rate, temperature and relative humidity until the temperature and humidity of the equipment are stable. To ensure the accuracy of the experimental data and avoid the influence of other pollutants, temperature and humidity on the filter performance test. The pressure drop under the rated airflow should be measured and recorded. In addition, the relationship between the pressure drop and the flow rate should be tested and recorded at 50%, 75%, 100% and 125% of the rated air volume. Note that the pipeline should have a minimum flow resistance, and the pressure drop of the pipeline without an air purifier filter installed should be recorded so that there are correct measures to correct the pressure drop.

[0043] Before starting the filtration experiment, place the prepared sample 6 on the Figure 1 In the test pipeline system shown in the figure, the combination of different shapes of plate, cylindrical, and triangular test samples and the pipeline system is shown in the attached figure. Figure 2-Figure 4 As shown, attention should be paid to the sealing between the test pipe and the fixture, and the sample 6 to be tested. A sealing strip or the like should be elastic and ensure that there is no leakage between the test pipe and the fixture, and the sample 6 to be tested.

[0044] The experimental method for the gaseous pollutant purification efficiency of the sample 6 to be tested is as follows:

[0045] Before the experiment, the air introduced is filtered through a high-efficiency filter to make the background concentration of particles with a particle size of more than 0.3 μm in the air less than 1000 / L, and the background concentration of the gaseous target pollutant to be tested is less than 10 ppb. At the same time, the temperature and humidity control device 5 is started to make the temperature and humidity in the pipeline reach the specified state. The purity of the gas generated by the gaseous pollutant generating device 4 is greater than 99% or above the secondary standard gas. At this time, the gas pollutant generating system is turned on. When the concentration of pollutants reaches the recommended maximum load concentration, the polluted gas is continuously introduced, and samples are taken upstream and downstream of the installed sample 6 to be tested. A fixed flow rate, preferably an independently controlled airflow, is drawn from the test channel to the gas analyzer. Samples are taken approximately every 10 seconds, or the fastest frequency allowed by the gas analyzer is used to draw an efficiency curve. The gas concentration is continuously detected until the gas concentration downstream of the sample reaches a specific percentage of 95% of the upstream concentration or reaches a predetermined experimental time, and the termination time is recorded. At this time, the injection of pollutants and the supply of airflow are stopped, the experiment is terminated, and the efficiency is calculated from the concentration data.

[0046] The calculation formula for the gaseous pollutant filtration efficiency of the filter element is:

[0047]

[0048] E: filtration efficiency;

[0049] C1: the concentration of pollutants located upstream of the sample 6 to be tested;

[0050] C2: the concentration of pollutants located downstream of the sample 6 to be tested;

[0051] The test method for the cumulative purification amount / pollution capacity of the gaseous pollutants of the sample 6 to be tested is as follows:

[0052] Treat the background gas as described in the gaseous pollutant purification efficiency test of the test sample 6, and wait until the pipeline environment reaches the specified state. The gas purity generated by the gaseous pollutant generation source is greater than 99% or above the secondary standard gas. At this time, turn on the gaseous pollutant generation system, and wait until the pollutant concentration reaches the recommended maximum load concentration at this time, and continue to introduce polluted gas. Sampling is performed regularly upstream of the installation of the test sample 6, and sampling is performed continuously downstream of the installation of the test sample 6. The method is the same as the gaseous pollutant purification efficiency experiment of the test sample. The test time is 15 hours, and the experiment is terminated. Draw as shown in the attached Figure 5 The curve of the filtration efficiency of the sample to be tested for gaseous pollutants over time is shown, and the cumulative purification amount of gaseous pollutants of the sample to be tested 6 is calculated. In the figure, L is the removal efficiency horizontal line at the end time; A is the cumulative purification amount of pollutants of the sample to be tested under the left curve at the end time during the test time; B is the total amount of pollutants that penetrate the sample to be tested above the left curve at the end time during the test time.

[0053] The calculation formula for the cumulative purification amount of gaseous pollutants of the sample to be tested is:

[0054]

[0055] m c :Measure the cumulative purification amount of pollutants caused by the sample to be tested;

[0056] m t : The total mass of contamination acting on the sample to be tested;

[0057] Note: The cumulative purification volume is the total mass of gaseous pollutants removed from the sample to be tested during an estimated test time of about 15 hours, in mg. The test time may be appropriately changed according to the actual effect of the sample to be tested.

[0058] The method of the invention is applicable to samples to be tested with various regular structures, such as plate-type, cylindrical, triangular filter elements, etc. Different fixtures can be added according to the different structures of the samples to be tested to test the samples to be tested.

[0059] Regarding the test accuracy assurance method / requirements of the detection instrument: The uncertainty of sensor measurement is usually calibrated by a controllable standard. The uncertainty of airflow and pressure drop measurement is ±2% of the actual reading value; the uncertainty of temperature measurement is ±0.5℃ of the actual reading value; the uncertainty of relative humidity measurement is ±1% of the actual reading value; the uncertainty of gas pollutant analyzer measurement is ±1.5% of the actual reading value. When two devices are used, the instruments should have the same sensitivity as much as possible; since the test time of the cumulative purification volume of the sample to be tested is relatively long, in order to ensure the accuracy of the cumulative purification volume test of the sample to be tested, an automatic control sampling system should be used. The sampling equipment ensures real-time sampling, transmission and storage of data, and a time timing module is installed on the equipment. The equipment is set to sample for 15 hours. The sampling equipment, pollutant generation device and gas supply system stop sampling, generation and gas supply. After about 10 minutes when the system gas is exhausted, the entire test system will automatically shut down to facilitate subsequent processing by the operator. For detailed procedures, see the attached Figure 6 Flowchart of the intelligent testing system for air purifier samples.

[0060] Principles of recommended detection instruments: For the detection instruments of the above gaseous pollutants, online equipment can be used. Chemiluminescence is recommended for ammonia detection; UV fluorescence is recommended for sulfur dioxide detection; photoacoustic spectroscopy PAS and controlled potential electrolysis (CPE) technology equipment are recommended for formaldehyde detection; photoionization detector PID, flame ionization detector FID, ultraviolet absorption UV technology, etc. are used for toluene detection. If the sensitivity of the online instrument is too low, non-online equipment can also be used, such as gas adsorption tube SOR and Tenax tube sampling GC-MS. If other gases are tested, the detection instruments can refer to ISO 10121-2.

[0061] Performance of test equipment: The test bench must ensure the uniformity of airflow and the stability of gas before the test sample is installed. The determination of airflow uniformity requires scanning at least nine sampling locations (the cross section is divided into nine equal squares, and the positioning probe is used to sample at the center of each square) according to ISO / TS21220 or ISO / TS11155-1:20014.2.1. At each sampling location, the deviation between the test value of gaseous pollutants and the average value should not exceed ±5%. The test of airflow stability must be checked with any mass flow controller used for gas measurement. Under the specified test gas concentration and only 10% concentration, the cross section is divided into four rectangles. At the center point of the cross section and between the center point and the edge of the opening, the five-point method is used on the same plane as the test sample. Each sampling point is sampled at least three times, and the average value is taken as the reading at the point. The five average concentrations are compared upstream and downstream of the test sample to ensure that the deviation does not exceed ±5%.

[0062] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An intelligent testing system for chemical filters of multiple gaseous pollutants, characterized in that: The invention comprises an air intake system (1), a flow regulating device (2), an air pre-filtering device (3), a gaseous pollutant generating device (4), a temperature and humidity control device (5), a sample to be tested (6), a gaseous pollutant detecting device (7), a pressure testing device (8), an exhaust gas treatment device (9), a flow monitoring device (10), an exhaust system (11), a first timing motor (12), and a second timing motor (13). According to the flow direction of the gas to be tested, the flow regulating device (2) is connected to the pipeline behind the air intake system (1), the air pre-filtering device (3) is connected to the pipeline behind the flow regulating device (2), the sample to be tested (6) is connected to the pipeline behind the air pre-filtering device (3), the gaseous pollutant generating device (4) and the temperature and humidity control device (5) are connected between the air pre-filtering device (3) and the exhaust gas treatment device (9). On the pipeline between the test samples (6), a gaseous pollutant detection device (7) and a pressure testing device (8) are respectively connected to the upstream and downstream pipe sections of the test samples (6); the pipeline behind the test samples (6) is connected to the exhaust gas treatment device (9); the pipeline behind the exhaust gas treatment device (9) is connected to the flow monitoring device (10); the pipeline behind the flow monitoring device (10) is connected to the exhaust system (11); a first timing motor (12) controls the air intake system (1), the gaseous pollutant generating device (4) and the gaseous pollutant detection device (7); and a second timing motor (13) controls the flow regulating device (2), the air pre-filtering device (3), the temperature and humidity control device (5), the pressure testing device (8), the exhaust gas treatment device (9), the flow monitoring device (10) and the exhaust system (11).

2. The intelligent testing system for chemical filters of multiple gaseous pollutants according to claim 1 is characterized in that: The experiment of this test system should be carried out in a closed test pipeline with an ambient temperature of (23±3)℃, a relative humidity of (50±3)%, no external airflow, strong sunlight and other radiation effects; the acceptable internal dimensions of the test pipeline are 300×300mm-610×610mm, and the length of the straight pipe section of the test section is greater than the internal dimensions of the pipeline, and at least 3 times the diameter of the straight pipe section is retained; the test pipeline should be leak tested every year to check the sealing of the pipeline, and the air leakage is required to be <100L / min under a pressure of 500Pa; the air volume of the test system should be the rated air volume of the air purifier, automobile filter, cabin chemical filter and electronic clean room chemical filter where the device is located, with a range of 150m 3 / h~4000m 3 / h.

3. The intelligent testing system for chemical filters of multiple gaseous pollutants according to claim 1 is characterized in that: The gaseous pollutant detection device (7) can use online equipment, ammonia detection can use chemiluminescence; sulfur dioxide detection can use UV fluorescence; formaldehyde detection can use photoacoustic spectroscopy (PAS) and controlled potential electrolysis (CPE) technology equipment; toluene detection can use photoionization detector (PID) or flame ionization detector (FID) or ultraviolet absorption (UV) technology; non-online equipment can also be used, such as gas adsorption tube (SOR) and Tenax tube sampling (GC-MS).

4. The intelligent testing system for chemical filters of multiple gaseous pollutants according to claim 1 is characterized in that: The test system must ensure the uniformity of the airflow and the stability of the gas before the test sample is installed; To determine the uniformity of the airflow, at least nine sampling locations must be scanned. The cross section can be divided into nine equal squares, and a positioning probe is used to sample at the center of each square. At each sampling location, the deviation between the test value of the gaseous pollutant and the average value does not exceed ±5%; The test of gas flow stability must be checked with any mass flow controller used for gas measurement, under the specified test gas concentration and only 10% of the concentration. The cross section is divided into four rectangles. At the center point of the cross section and between the center point and the edge of the opening, the five-point method is used on the same plane as the sample to be tested. Each sampling point is sampled at least three times, and the average value is taken as the reading at the point. Compare these five average concentrations, distributed upstream and downstream of the sample to be tested, to ensure that the deviation does not exceed ± 5%.

5. A method for intelligent performance testing of chemical filters for multiple gaseous pollutants, characterized in that: The following steps are involved: First, pretreatment is performed, the air intake system (1) is started, and the temperature and humidity control device (5), the flow regulating device (2) and the flow monitoring device (10) are turned on; Clean air with appropriate flow rate, temperature and relative humidity is introduced for pretreatment, and the gas passes through the flow regulating device (2), the air pre-filter device (3), the sample to be tested (6), the exhaust gas treatment device (9), the flow monitoring device (10) in sequence, and finally is discharged from the pipeline through the exhaust system (11); until the temperature and humidity of the gas passing through the equipment are stable; the pressure drop of the sample to be tested (6) at the rated air volume should be measured and recorded; in addition, the relationship between the pressure drop and the flow rate should be tested and recorded at 50%, 75%, 100% and 125% of the rated air volume; Then, the corresponding performance test is performed: the gaseous pollutant generating device (4) is turned on and adjusted, the temperature and humidity in the test pipeline is monitored by the temperature and humidity control device (5) to reach the target value of the test environment, the gaseous pollutant detection device (7) is used to monitor the pollutant concentration upstream of the test sample (6), and when it reaches the recommended maximum load concentration allowed for different performance tests, the polluted gas is continuously introduced, and the performance test of the test sample (6) is performed, and the sampling is continuously performed upstream and downstream of the test sample (6) for a preset time, and finally the gas purification efficiency and cumulative purification volume / pollutant capacity test of the test sample is completed; Finally, the experiment is stopped, the first timing motor (12) first turns off the gaseous pollutant generating device (4), and after the gaseous pollutants are exhausted, that is, the gaseous pollutant detecting device (7) shows 0, turns off the gaseous pollutant detecting device (7), and finally turns off the air intake system (1); 10 minutes after the above instruments are turned off, the second timing motor (13) turns off the flow regulating device (2), the temperature and humidity control device (5), the pressure testing device (8), the flow monitoring device (10) and the exhaust system (11).

6. The intelligent performance testing method for chemical filters of multiple gaseous pollutants according to claim 5 is characterized in that: The experimental method for the gaseous pollutant purification efficiency of the sample to be tested (6) comprises the following contents: The air intake system (1) is started, and the flow regulating device (2) is adjusted to introduce a suitable flow rate. The air introduced before the experiment is filtered by the air pre-filter device (3) so that the background concentration of particles with a particle size of 0.3 μm or more in the air is less than 1000 particles / L, and the background concentration of the gaseous target pollutant to be tested is less than 10 ppb. At the same time, the temperature and humidity control device (5) is started to make the temperature and humidity in the pipeline reach the specified state; the flow regulating device (2) is adjusted until the flow detection device (10) reaches the rated flow of the sample to be tested (6); the gas purity generated by the gaseous pollutant generating device (4) is greater than 99% or above the secondary standard gas, and the gaseous pollutant generating device (4) is turned on at this time. When the pollutant concentration reaches the recommended maximum allowable load concentration, the polluted gas is continuously introduced, and sampling is performed at the upstream and downstream of the installed sample to be tested (6), and a fixed flow of air is drawn out from the test channel to the gaseous pollutant detection device. (7); sampling once every 10 seconds, or using the fastest frequency allowed by the gas pollutant detection device (7); continuously detecting the gas concentration until the gas concentration downstream of the sample to be tested (6) reaches a specific percentage of 95% of the upstream concentration or reaches a predetermined experimental time, and recording the termination time; terminating the experiment, the first timing motor (12): first turning off the gaseous pollutant generating device (4), and after the gaseous pollutants are emptied, that is, the gaseous pollutant detection device (7) shows 0, turning off the gaseous pollutant detection device (7), and finally turning off the air intake system (1); after the above instruments are turned off for 10 minutes, the second timing motor (13) turns off the flow regulating device (2), the temperature and humidity control device (5), the pressure testing device (8), the flow monitoring device (10) and the exhaust system (11), and the computer calculates the gaseous pollutant filtration efficiency using the concentration data through the corresponding filtration efficiency calculation formula.

7. The intelligent performance testing method for chemical filters of multiple gaseous pollutants according to claim 6 is characterized in that: The calculation formula for gaseous pollutant filtration efficiency is: E: filtration efficiency; C1: the concentration of pollutants located upstream of the sample to be tested; C2: the concentration of pollutants located downstream of the sample to be tested.

8. The intelligent performance testing method for chemical filters of multiple gaseous pollutants according to claim 5 is characterized in that: The test method for the cumulative purification amount / pollution holding capacity of the gaseous pollutants of the sample to be tested (6) comprises the following contents: The air intake system (1) is started, and the flow regulating device (2) is adjusted to introduce a suitable flow rate. The air introduced before the experiment is filtered by the air pre-filter device (3) so that the background concentration of particles with a particle size of 0.3 μm or more in the air is less than 1000 particles / L, and the background concentration of the gaseous target pollutant to be measured is less than 10 ppb. At the same time, the temperature and humidity control device (5) is started to make the temperature and humidity in the pipeline reach the specified state; the flow regulating device (2) is adjusted until the flow detection device (10) reaches the rated flow of the sample to be measured (6); the gaseous pollutant generating device (4) generates a gas with a purity greater than 99% or above the secondary standard gas. At this time, the gaseous pollutant generating device (4) is turned on, and the pollutant concentration is allowed to reach the maximum load concentration recommended at this time. The polluted gas is continuously introduced, and sampling is performed regularly upstream of the sample to be measured (6). The downstream of the test piece (6) is continuously sampled to conduct a gaseous pollutant purification efficiency test on the test piece (6). The test time is 15 hours and the test is terminated. The first timing motor (12): first turns off the gaseous pollutant generating device (4), and after the gaseous pollutants are emptied, that is, the gaseous pollutant device (7) shows 0, turns off the gaseous pollutant detection device (7), and finally turns off the air intake system (1); after the above instruments are turned off for 10 minutes, the second timing motor (13) turns off the flow regulating device (2), the temperature and humidity control device (5), the pressure testing device (8), the flow monitoring device (10) and the exhaust system (11); the computer calculates the filtration efficiency through the corresponding test data, and finally draws a curve of the filtration efficiency of the test piece (6) for gaseous pollutants changing with time, and calculates the cumulative purification amount of gaseous pollutants of the test piece (6).

9. The intelligent testing system and performance testing method for chemical filters of multiple gaseous pollutants according to claim 8, characterized in that: The calculation formula for the cumulative purification amount of gaseous pollutants is: m c :Measure the cumulative purification amount of pollutants caused by the sample to be tested; m t : The total mass of contamination acting on the sample to be tested; Note: The cumulative purification volume is the total mass of gaseous pollutants removed from the sample to be tested during an estimated test time of about 15 hours, in mg. The test time may be appropriately changed according to the actual effect of the sample to be tested.

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