Detection device and method for simulating filtering performance of salt mist removal filter in coastal environment

Abstract

The invention provides a device for detecting the filtering performance of a salt mist removing filter in a simulated coastal environment, the device comprises a static pressure chamber, a workbench, a salt mist generating device, a salt mist absorbing device, a fan and a tested filter, the salt mist generating device comprises a liquid storage tank, an atomizing nozzle, a pressure reducing valve and a liquid conveying pipe, and the lower end of the liquid conveying pipe is communicated with a sodium chloride solution in the liquid storage tank; the upper end of the liquid conveying pipe is connected with an atomizing nozzle, compressed air is connected with the atomizing nozzle through a pipeline, and a pressure reducing valve is arranged on the pipeline. The device and the method for detecting the performance of the salt mist filter have the advantages that the device and the method simulate coastal environments, are simple and rapid in testing, are harmless to human bodies and environments, are free of limitation of salt mist particle sizes and are high in precision.

Description

Technical Field

[0001] The invention relates to the technical field of filter performance detection, and in particular to a device and method for detecting the filtering performance of a desalination mist filter in a simulated coastal environment. Background Art

[0002] Industrial equipment in high-salt and high-humidity environments such as offshore, islands and reefs, and coastal areas, such as wind power and mechanical equipment, are extremely susceptible to corrosion from salt spray, which accelerates the aging of materials, affects the performance and service life of equipment, and in severe cases directly or indirectly threatens the safety of production and production personnel, causing serious economic losses. Therefore, air filters must be installed in the air intake systems of production equipment and equipment operating in offshore and coastal environments.

[0003] At present, due to the lack of relevant standards and regulations, the quality and performance of salt spray filters produced at home and abroad on the market vary greatly. It is impossible to distinguish the filtering effect of salt spray filters, and it is even more impossible to select salt spray filters with corresponding filtering effects according to actual working conditions. Therefore, effective and accurate detection of filter performance has become a problem that needs to be solved urgently.

[0004] At present, there are many air filter performance testing methods in China. For example, some filter manufacturers judge the filter performance by visually observing the changes in salt spray concentration before and after the filter. This method is too subjective and not accurate enough and cannot be used for the filtration efficiency testing of salt spray filters.

[0005] In the prior art, the concentration of atomized particles before and after the filter is obtained by mercuric thiocyanate spectrophotometry, and the detection method for calculating the filter efficiency is only applicable to the measurement of chloride ion content in simple water samples. However, the components of actual seaside salt spray are complex and diverse, which will be subject to certain interference and have poor stability, and are not applicable to the detection of salt spray under actual working conditions. In the prior art, the filtration efficiency is also detected by sampling and counting the salt spray particles before and after the filter through an air particle counter. However, the accuracy of the air particle counter is not high, which limits the size of the salt spray particles and ignores the small sodium chloride particles with a particle size of less than 0.1um. This efficiency calculation method is not applicable to the calculation of the efficiency of small-particle salt spray. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings existing in the prior art. The present invention is a test bench device modified by a salt spray generator so that the salt spray can be emitted at a stable flow rate. The salt spray collection device can accurately collect particles filtered by the salt spray filter, and detect the salt spray concentration downstream of the filter through an ion chromatograph, and calculate the salt spray filtration efficiency of the salt spray filter through the amount of salt spray generated upstream. A detection device and a detection method for the performance of a high-precision salt spray filter are proposed, which are simple and fast to test in a simulated coastal environment, are harmless to the human body and the environment, and have no salt spray particle size limit.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A testing device for the filtering performance of a desalination filter in a simulated coastal environment, including a static pressure chamber, a workbench, a salt mist generating device, a salt mist absorbing device, a fan and a test filter; The static pressure chamber is arranged at the front end of the workbench, the fan is arranged at the end of the workbench, the salt spray generating device is arranged in the static pressure chamber, the test filter is installed in the air duct of the workbench, the salt spray absorbing device is arranged at the rear end of the test filter, and the air ducts of the workbench upstream and downstream of the test filter are respectively provided with an upstream pressure test point and a downstream pressure test point. Further, the salt spray generating device includes a liquid storage tank, an atomizing nozzle, a pressure reducing valve and an infusion tube, the lower end of the infusion tube is connected to the sodium chloride solution in the liquid storage tank, the upper end of the infusion tube is connected to the atomizing nozzle, the compressed air is connected to the atomizing nozzle through a pipeline, the pressure reducing valve is arranged on the pipeline, and a pressure gauge is arranged on the pressure reducing valve.

[0008] Furthermore, a high efficiency filter is arranged at the front end of the static pressure chamber, and a terminal filter is installed in the air duct near the end of the workbench, and the terminal filter is arranged downstream of the test filter.

[0009] Furthermore, the atomizing nozzle is configured as a plurality of liquid atomizing channels, and the liquid atomizing channels are designed independently of each other.

[0010] Furthermore, the salt spray absorption device includes an air sampling pump, an anti-backflow bottle, an air sampling bottle and a sampling tube. The air sampling bottle stores absorption liquid. One end of the sampling tube penetrates into the workbench and is arranged in the air duct at the rear end of the test filter. The sampling tube mouth plane of the sampling tube is perpendicular to the air flow direction. The other end of the sampling tube is inserted into the air sampling bottle and immersed in the absorption liquid. The upper end of the air sampling bottle is connected to the lower part of the anti-backflow bottle through a connecting tube, and the upper part of the backflow bottle is connected to the air sampling pump through a pump tube.

[0011] Furthermore, the workbench includes an upstream pipe section, a test filter installation pipe section, a downstream pipe section and a terminal pipe section which are connected in sequence, the upstream pipe section is provided with the upstream pressure test point, the test filter is installed in the test filter installation pipe section, the test filter is sealed to the air duct with a sealing strip, the downstream pipe section is provided with the downstream pressure test point, the salt spray absorption device and the terminal filter, and the rear end of the terminal pipe section is connected to the fan.

[0012] Furthermore, it also includes a chloride ion concentration detection device, after the salt spray absorption device performs salt spray sampling downstream of the test filter, the sampling liquid is passed through the chloride ion concentration detection device to detect the chloride ion concentration, and the salt spray filtration efficiency of the test filter is calculated. The chloride ion concentration detection device is an ion chromatograph, a cold atomic absorption spectrometer or an ion selective electrode.

[0013] Furthermore, a temperature and humidity test point and a temperature and humidity sensor are also provided in the workbench. The temperature and humidity test point is arranged upstream of the test filter, and the temperature and humidity sensor is arranged between the test filter and the salt spray absorption device.

[0014] A method for detecting the filtering performance of a desalination mist filter in a simulated coastal environment comprises the following steps: S1: A detection device for the filtering performance of a desalination filter under a simulated coastal environment is used, the test filter is installed on a workbench, the workbench is operated, background sampling and salt spray sampling are performed respectively when the test filter has an initial resistance and reaches a set final resistance value, and the air sampling bottles of the salt spray absorption device for the two samplings are taken out respectively; S2: diluting the solutions in the two air sampling bottles respectively to obtain background test solution and salt spray test solution; S3: Analyze the chloride ion content in the background test liquid and the salt spray test liquid by ion chromatography to obtain the background concentration of the initial salt spray particles and the concentration of the purified salt spray particles when the test filter reaches the set final resistance value; S4: Calculate the difference between the background concentration of the initial salt mist particles and the concentration of the purified salt mist particles when the filter reaches the set final resistance value, calculate the mass of the salt mist particles passing through the downstream of the filter, and calculate the salt mist filtration efficiency within the set resistance range based on the amount of salt mist generated upstream.

[0015] Further, specifically, the test filter is installed on the test workbench to ensure good sealing, and the filter test is performed at the rated air volume. After the air volume of the test workbench is stable, the initial resistance of the test filter is tested, and the salt spray absorption device is connected to the downstream of the test filter for sampling. The sampling time is 0-30 minutes, and the sampling flow rate is 0-10 L / min to obtain the background test liquid; the salt spray generating device is turned on to ensure that the atomization flow rate is maintained at 0-10 Kg / h, and the upstream humidity is maintained at 50% -100%RH. When the final resistance of the test filter is reached, the salt spray absorption device is connected again for sampling. The sampling time is 0-30 minutes, and the sampling flow rate is 0-10 L / min, to obtain a salt spray test liquid; dilute the background test liquid and the salt spray test liquid, filter and perform ion chromatography detection and analysis to obtain the background concentration of initial salt spray particles downstream of the test filter and the concentration of filtered salt spray particles when the test filter reaches a set final resistance value, calculate the mass of salt spray particles passing through the downstream of the test filter through the difference between the background concentration of initial salt spray particles and the concentration of purified salt spray particles when the test filter reaches the set final resistance value, and calculate the salt spray filtration efficiency of the test filter according to the salt spray generation amount of the upstream salt spray generating device.

[0016] Furthermore, the rated air volume is the air volume specified by the filter manufacturer or the air volume required by the tester. During the entire test process, the humidity upstream of the test filter is ≥85%RH.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention improves the evaluation method of salt spray filters and avoids the subjectivity of manual judgment; 2. By using a pressure-type salt spray generator, it is easy to clean and can better guarantee the stable output of salt spray flow during each test. The consistency and repeatability of the filter test results are high. The atomizing nozzle can spray extremely fine sodium chloride particles, which is closer to the salt spray particle size in coastal areas under actual working conditions; 3. The salt spray sampling device downstream of the filter can fully dissolve the salt spray sample in water. The sampling tube has a high sealing performance and can store the sample for a long time without affecting the sample concentration, which can ensure the accuracy of the subsequent chloride ion content analysis; 4. The present invention adopts ion chromatography to detect the concentration of salt spray particles. Ion chromatography has the advantages of high detection accuracy, convenient and fast detection, good stability, and the detection results are not affected by impurities. The salt spray filter is matched with ion chromatography detection, which is not affected by the concentration, particle size and complexity of the components of the salt spray under actual working conditions, and can ensure the accuracy and reproducibility of the test results. Compared with other chloride ion detection methods, it can be used as the best choice for salt spray filter detection; 5. The present invention is not affected by the sampling particles and the storage time of the sample, and can accurately quantify the salt spray filtration performance of the salt spray filter, so that it is more convenient to select a salt spray filter with a corresponding filtration effect according to different actual working conditions.

[0018] 6. The salt spray particles upstream of the filter contain a large amount of water, so the chloride ion concentration upstream cannot be quantified. After being filtered by the water-repellent filter material of the salt spray filter, the salt spray dry particles downstream of the filter can be accurately quantified. Compared with the traditional salt spray filter efficiency calculated by concentration ratio, which is inaccurate and much lower than the actual value, the present invention calculates the efficiency of the salt spray filter by converting the mass of the downstream concentration, which is more accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a device for detecting the filtering performance of a desalination mist filter in a simulated coastal environment according to Example 1 of the present invention; Figure 2 This is a schematic structural diagram of a salt mist generating device of a device for detecting the filtering performance of a desalination mist filter in a simulated coastal environment according to Example 1 of the present invention; Figure 3 A schematic diagram of the cross-sectional structure of an atomizing nozzle of a device for detecting the filtering performance of a desalination mist filter in a simulated coastal environment according to Example 1 of the present invention; Figure 4 It is a structural schematic diagram of a salt mist absorption device of a device for detecting the filtering performance of a desalination mist filter in a simulated coastal environment according to Example 1 of the present invention; Figure 5 This is a flow chart of the steps of a method for detecting the filtering performance of a desalination mist filter in a simulated coastal environment according to Example 2 of the present invention. DETAILED DESCRIPTION

[0020] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments. Example

[0021] like Figure 1 As shown, a testing device for the filtering performance of a desalination filter in a simulated coastal environment includes a static pressure chamber 1, a workbench, a salt mist generating device 8, a salt mist absorbing device 14, a fan 15, and a test filter 4; The static pressure chamber 1 is arranged at the front end of the workbench, and the fan 15 is arranged at the end of the workbench. Under the power of the fan 15, the airflow flows from the front end to the end of the workbench, and the inside of the workbench is negative pressure. The entire workbench should be kept dry and clean without foreign matter.

[0022] The salt spray generating device is arranged in the static pressure chamber 1, which reduces the working noise of the workbench, evenly distributes the air volume through the static pressure chamber 1, ensures that the air volume and wind speed of the static pressure chamber 1 are consistent, improves the consistency of the system, ensures that the device can operate stably for a long time, and ensures the consistency and repeatability of the performance test.

[0023] The test filter 4 is installed in the air duct of the workbench. The size of the test filter 4 should be smaller than the size of the test bench air duct. The test filter 4 is installed on the workbench, and the filter and the air duct are sealed with a sealing strip to ensure no leakage.

[0024] The salt spray absorption device 14 is arranged at the rear end of the test filter 4. By arranging the salt spray absorption device 14 downstream of the test filter 4, after filtering through the water-repellent filter material of the test filter, the downstream of the test filter 4 is salt spray dry particles, so the chloride ion concentration downstream can be accurately quantified. After the salt spray absorption device performs salt spray sampling downstream of the test filter, the sampling liquid is tested for chloride ion concentration by a chloride ion concentration detection device, and the salt spray filtration efficiency of the test filter is calculated. The chloride ion concentration detection device is independent of the entire workbench and is used to measure the filtering effect of the test filter. The chloride ion concentration detection device is an ion chromatograph, a cold atomic absorption spectrometer or an ion selective electrode. One device can be used alone for concentration detection, or multiple devices can be used to detect the chloride ion concentration of the collected liquid, to ensure that the chloride ion concentration detection is more accurate, facilitate the analysis of changes in concentration differences, reduce interference, and accurately quantify the downstream chloride ion concentration.

[0025] An upstream pressure test point 9 and a downstream pressure test point 12 are respectively provided in the air duct of the workbench upstream and downstream of the test filter 4. The upstream pressure test point 9 and the downstream pressure test point 12 can better monitor the change of the filter resistance (the filter resistance is the pressure difference between the two) during the test process, and the service life of the test filter 4 can also be detected and determined through the upstream and downstream pressure test points.

[0026] Furthermore, a high efficiency filter 7 is provided at the front end of the static pressure chamber 1. The high efficiency filter 7 is installed on the outside of the static pressure chamber 1, which can effectively prevent external dust and impurities from being sucked into the test air duct and affecting the test results and accuracy.

[0027] A terminal filter 13 is installed in the air duct near the end of the workbench, and the terminal filter 13 is arranged downstream of the test filter. The terminal filter 13 can collect the particles and dust that pass through to avoid being discharged into the atmosphere to pollute the environment.

[0028] Further, combined with Figure 2The salt spray generating device 8 comprises a liquid storage tank 81, an atomizing nozzle 82, a pressure reducing valve 83 and an infusion tube 84. The lower end of the infusion tube 84 is connected to the sodium chloride solution in the liquid storage tank 81, and the upper end of the infusion tube 84 is connected to the atomizing nozzle 82. Compressed air is connected to the atomizing nozzle 82 through a pipeline. The pressure reducing valve 83 is arranged on the pipeline, and a pressure gauge 85 is arranged on the pressure reducing valve 83. The liquid storage tank 81 is filled with sodium chloride solution, and the salt spray generating device 8 can atomize the sodium chloride solution in the liquid storage tank 81 into salt spray particles, and emit salt spray particles at a stable flow rate. In order to better simulate the marine environment of the sea, islands and reefs and near coastal areas, the concentration of the sodium chloride solution in the water tank can be 3%-5%.

[0029] When in use, compressed air passes through the pressure reducing valve 83, and the pressure reducing valve 83 is provided with a pressure gauge 85. Under the negative pressure generated in the atomizing nozzle 82, the liquid to be atomized in the liquid storage tank 81 is sucked from the liquid storage tank and finally atomized. The atomizing nozzle 82 can ensure that the salt spray is evenly distributed in the entire test workbench, and ensure that the humidity in the space upstream of the test filter 4 can be evenly maintained at 50%-100%RH. During the filtering process, it can evenly pass through the entire air inlet surface of the test filter 4. In addition, it can also ensure that the sprayed salt spray particles can cover all particle size ranges. The present invention uses a pressure-type salt spray generating device, which is easy to clean and can better guarantee the stable output of the salt spray flow rate during each test. The consistency and repeatability of the filter test results are high. The atomizing nozzle 82 can spray out extremely fine sodium chloride particles, which are closer to the salt spray particle size near the coastal area under actual working conditions.

[0030] Further, such as Figure 3 , the atomizing nozzle 82 is configured with a plurality of liquid atomizing channels 821, which are independently designed. The entire atomizing nozzle 82 is designed as 6 channels 821, which conforms to the design of large salt spray flow rate. Each channel can provide atomized liquid separately, and the liquid can be quickly decomposed into smaller and finer droplets, making the spray more uniform, improving the atomization efficiency, and being able to cover a larger area, ensuring the consistent effect of the entire test area.

[0031] The multi-channel design can also reduce the risk of blockage. When individual channels 821 are blocked, other channels can continue to work, thus ensuring that the nozzle will not fail completely, greatly reducing maintenance costs and downtime in long-term operation. In addition, multi-channel holes can achieve the same or better spray effect at lower air pressure, saving energy and reducing liquid waste.

[0032] Further, combined with Figure 4The salt spray absorption device 14 includes an air sampling pump 141, an anti-backflow bottle 142, an air sampling bottle 143 and a sampling tube 144. The air sampling bottle 143 stores an absorption liquid 145. One end of the sampling tube 144 penetrates into the workbench and is arranged in the air duct at the rear end of the test filter 4. The sampling tube mouth plane of the sampling tube 144 is perpendicular to the airflow direction. The airflow directly impacts the sampling tube mouth. The sampling tube can more effectively capture the particulate matter and gas components in the airflow, ensuring that the sampling efficiency is maximized. The sampling perpendicular to the airflow direction ensures that the collected samples are more representative and reduce sampling errors. The other end of the sampling tube 144 is inserted into the air sampling bottle 143 and immersed in the absorption liquid 145 to ensure that the collected salt spray particles are fully absorbed and dissolved in the absorption liquid. The upper end of the air sampling bottle 143 is connected to the lower part of the anti-backflow bottle 142 through a connecting tube, and the upper part of the backflow bottle 142 is connected to the air sampling pump 141 through a pump tube.

[0033] When the air sampling pump 141 is running, the salt spray particles in the air enter the air sampling bottle 143 along with the air flow and are dissolved in the absorption liquid 145. The anti-backflow bottle 142 can be used to prevent the absorption liquid 145 from being backflowed into the air sampling pump 141 due to excessive sampling flow, thereby damaging the sampling pump. The absorption liquid 145 that has dissolved the salt spray particles is appropriately diluted and then tested for concentration using an ion chromatograph.

[0034] The present invention, by designing an anti-backflow bottle, can firstly prevent the sample or other substances from flowing back into the air sampling pump 141 when the air sampling pump 141 stops or the pressure is unstable, thereby preventing the sample from being contaminated by the substances in the pump, thereby ensuring the purity and accuracy of the sample and preventing sample contamination. Secondly, it can prevent the sample from being backflown into the air sampling pump 141, thereby avoiding damage to the precision components of the air sampling pump 141 and extending the service life of the equipment; thirdly, it ensures convenient equipment maintenance: reduces failures caused by backflow and equipment cleaning and maintenance requirements, and reduces the frequency and cost of equipment maintenance. Finally, it helps maintain pressure stability during the sampling process, ensures the accuracy and reproducibility of the sampling data, and ensures high sampling stability.

[0035] Further, such as Figure 1The workbench is also provided with a temperature and humidity test point 10 and a temperature and humidity sensor 11. The temperature and humidity test point 10 is arranged upstream of the test filter 4, and the temperature and humidity sensor 11 is arranged between the test filter 4 and the salt spray absorption device 14. The upstream temperature and humidity measuring point 10 can use a waterproof thermometer and hygrometer; by monitoring the upstream temperature and humidity, it is ensured that the upstream humidity can be at the specified humidity during the whole process of the test. The thermometer and hygrometer sensor 11 downstream of the filter can monitor the downstream temperature and humidity after the salt spray filter filters the salt spray particles in real time. By means of the humidity display, it can be judged whether there is water vapor penetration downstream, and the water repellent filtering performance of the test filter can be detected. The service life of the test filter 4 is monitored to ensure that the downstream salt spray particles are dry salt spray particles, accurately quantify the chloride ion concentration downstream, and ensure the stability and repeatability of the performance test.

[0036] Furthermore, the workbench includes an upstream pipe section 2, a test filter installation pipe section 3, a downstream pipe section 5 and a terminal pipe section 6 connected in sequence, each section can be detachably fixed by a flange, and a good sealing is ensured by a seal, so as to ensure that the workbench of the present invention is easy to maintain and install, and convenient to install and remove the test filter, and is easy to use. The upstream pressure test point 9 is set in the upstream pipe section 2, the test filter 4 is installed in the test filter installation pipe section 3, and the test filter 4 is sealed with a sealing strip to the air duct, the downstream pressure test point 12, the salt spray absorption device 14 and the terminal filter 13 are set in the downstream pipe section 5, and the rear end of the terminal pipe section 6 is connected to the fan 15.

[0037] Under the power of the fan 15, the salt mist particles atomized by the salt mist generating device and the water mist spraying device 8 pass through the upstream pipe section 2 of the workbench and reach the upstream of the test filter 4. After the temperature and humidity measuring point 10 detects the upstream temperature and humidity, the salt mist passes through the test filter 4 and reaches the downstream of the filter. The temperature and humidity sensor 11 detects the downstream humidity to determine whether there is water vapor passing through. The salt mist particles sampled by the salt mist absorption device 14 are diluted and quantitatively and qualitatively analyzed by an ion chromatograph to obtain an accurate salt mist concentration sampled downstream of the filter. After conversion into the mass of the downstream salt mist particles and combined with the upstream salt mist generation amount, the salt mist filtration efficiency of the salt mist filter can be obtained. Example

[0038] A method for detecting the filtering performance of a desalination mist filter in a simulated coastal environment comprises the following steps: S1: The detection device for the filtering performance of the desalting mist filter in the simulated coastal environment of Example 1 is applied, the test filter is installed on a workbench, and the workbench is operated. Background sampling and salt mist sampling are respectively performed when the test filter 4 has an initial resistance and reaches a set final resistance value, and the air sampling bottle 143 of the salt mist absorption device 14 for the two samples is taken out respectively; the present invention performs background sampling and salt mist sampling respectively, removes background interference, ensures the stability of the performance test of the present invention, reduces interference, and ensures the accuracy of the performance test.

[0039] S2: dilute the solutions in the two air sampling bottles 143 respectively to obtain background test solution and salt spray test solution; ensure that the solution concentration meets the detection concentration of the ion chromatograph, ensure the accuracy of the experiment, avoid damage to the ion chromatograph, and affect the life of the instrument.

[0040] S3: The chloride ion content in the background test liquid and the salt spray test liquid is analyzed by ion chromatograph to obtain the background concentration of the initial salt spray particles and the concentration of the purified salt spray particles when the test filter 4 reaches the set final resistance value; the present invention uses ion chromatograph for analysis, and ion chromatography has the advantages of high detection accuracy, convenient and fast detection, good stability, and the detection results are not affected by impurities. It is not affected by the concentration, particle size and complexity of the components of the salt spray under actual working conditions, and can ensure the accuracy and reproducibility of the test results.

[0041] S4: Calculate the difference between the background concentration of the initial salt spray particles and the concentration of the purified salt spray particles when the filter reaches the set final resistance value, calculate the mass of the salt spray particles passing through the filter downstream, and calculate the salt spray filtration efficiency within the set resistance range based on the amount of salt spray generated upstream. Calculating the efficiency of the salt spray filter by converting the mass by the downstream concentration is more accurate and reliable. Avoid the situation where the efficiency of the salt spray filter calculated by the concentration ratio is inaccurate and much lower than the actual value.

[0042] The invention collects particles filtered by a salt spray filter, detects the salt spray concentration downstream of the filter by an ion chromatograph, and calculates the salt spray filtration efficiency of the salt spray filter by the amount of salt spray generated upstream. The method is simple and fast to test, is harmless to human body and environment, and has high precision without salt spray particle size limit.

[0043] Further, specifically, the test filter 4 is installed on the test workbench to ensure good sealing, and the filter test is performed at the rated air volume. After the air volume of the test workbench is stable, the initial resistance of the test filter 4 is tested, and the salt spray absorption device 14 is connected to the downstream of the test filter 4 for sampling. The sampling time is 0-30 minutes, and the sampling flow rate is 0-10 L / min to obtain the background test liquid; the salt spray generating device 8 is turned on to ensure that the atomization flow rate is maintained at 0-10 Kg / h, and the upstream humidity is maintained at 50%-100%RH. When the final resistance of the test filter 4 is reached, the salt spray absorption device 14 is connected again for sampling. The sampling conditions are the same as the background sampling to ensure the consistency of the sampling. The sampling time is 0-30 minutes, and the sampling flow rate is 0-10 L / min, obtain the salt spray test liquid; dilute the background test liquid and the salt spray test liquid, filter and perform ion chromatography detection and analysis, obtain the background concentration of the initial salt spray particles downstream of the test filter 4 and the concentration of the filtered salt spray particles when the test filter reaches the set final resistance value, calculate the mass of the salt spray particles passing through the downstream of the test filter 4 by the difference between the background concentration of the initial salt spray particles and the concentration of the purified salt spray particles when the test filter reaches the set final resistance value, and calculate the salt spray filtration efficiency of the test filter 4 according to the salt spray generation amount of the upstream salt spray generating device. The test process is convenient and fast, saving test time and customer waiting time. The test workbench meets national standards and has high customer recognition. In addition, the use of ion chromatography for detection avoids the shortcomings of other chloride ion detection methods, can be applied to the detection of salt spray particle concentrations of different particle sizes under actual working conditions, and the test results are not affected by other impurities in the seaside salt spray under actual working conditions, and have the advantages of high applicability, high accuracy, high reproducibility and high reliability.

[0044] Furthermore, the rated air volume is the air volume specified by the filter manufacturer or the air volume required by the tester, which ensures that the present invention meets the actual industrial needs when testing performance, and is convenient for selecting the corresponding filter testing performance according to the actual working conditions. During the whole test process, the humidity upstream of the tested filter 4 is ≥85%RH. Using high humidity test conditions helps to more realistically simulate the corrosive conditions that may be encountered in the actual use environment, thereby more accurately evaluating the salt spray filtration performance of the filter, better reflecting the problems that the filter may encounter in actual applications, and facilitating industrial testing and use.

[0045] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A detection device for the filtering performance of a desalination filter in a simulated coastal environment, characterized in that: It includes a static pressure chamber, a workbench, a salt spray generating device, a salt spray absorbing device, a fan and a test filter; The static pressure chamber is arranged at the front end of the workbench, the fan is arranged at the end of the workbench, the salt spray generating device is arranged in the static pressure chamber, the test filter is installed in the air duct of the workbench, the salt spray absorbing device is arranged at the rear end of the test filter, and the air ducts of the workbench upstream and downstream of the test filter are respectively provided with an upstream pressure test point and a downstream pressure test point; The salt spray generating device comprises a liquid storage tank, an atomizing nozzle, a pressure reducing valve and an infusion tube, the lower end of the infusion tube is connected to the sodium chloride solution in the liquid storage tank, the upper end of the infusion tube is connected to the atomizing nozzle, compressed air is connected to the atomizing nozzle through a pipeline, the pressure reducing valve is arranged on the pipeline, and a pressure gauge is arranged on the pressure reducing valve.

2. The detection device for the filtering performance of the desalination mist filter in a simulated coastal environment as claimed in claim 1, characterized in that: A high efficiency filter is also arranged at the front end of the static pressure chamber, and a terminal filter is installed in the air duct near the end of the workbench, and the terminal filter is arranged downstream of the test filter.

3. The detection device for the filtering performance of the desalination mist filter in a simulated coastal environment as claimed in claim 1, characterized in that: The atomizing nozzle is configured as a plurality of liquid atomizing channels, and the liquid atomizing channels are designed independently of each other.

4. The detection device for the filtering performance of the desalination mist filter in a simulated coastal environment as claimed in claim 1, characterized in that: The salt spray absorption device includes an air sampling pump, an anti-backflow bottle, an air sampling bottle and a sampling tube. The air sampling bottle stores absorption liquid. One end of the sampling tube penetrates into the workbench and is arranged in the air duct at the rear end of the test filter. The sampling tube mouth plane of the sampling tube is perpendicular to the air flow direction. The other end of the sampling tube is inserted into the air sampling bottle and immersed in the absorption liquid. The upper end of the air sampling bottle is connected to the lower part of the anti-backflow bottle through a connecting tube, and the upper part of the backflow bottle is connected to the air sampling pump through a pump tube.

5. The detection device for the filtering performance of the desalination mist filter in a simulated coastal environment as claimed in claim 2, characterized in that: The workbench includes an upstream pipe section, a test filter installation pipe section, a downstream pipe section and a terminal pipe section which are connected in sequence. The upstream pipe section is provided with the upstream pressure test point. The test filter is installed in the test filter installation pipe section. The test filter and the air duct are sealed with a sealing strip. The downstream pipe section is provided with the downstream pressure test point, the salt spray absorption device and the terminal filter. The rear end of the terminal pipe section is connected to the fan.

6. The detection device for the filtering performance of the desalination mist filter in a simulated coastal environment as claimed in claim 1, characterized in that: A temperature and humidity test point and a temperature and humidity sensor are also provided in the workbench. The temperature and humidity test point is arranged upstream of the tested filter, and the temperature and humidity sensor is arranged between the tested filter and the salt spray absorption device.

7. The detection device for the filtering performance of the desalination mist filter in a simulated coastal environment as claimed in claim 1, characterized in that: It also includes a chloride ion concentration detection device. After the salt spray absorption device performs salt spray sampling downstream of the test filter, the sampling liquid passes through the chloride ion concentration detection device to detect the chloride ion concentration, and the salt spray filtration efficiency of the test filter is calculated. The chloride ion concentration detection device is an ion chromatograph, a cold atomic absorption spectrometer or an ion selective electrode.

8. A method for testing the filtering performance of a desalination filter in a simulated coastal environment, characterized in that: The following steps are involved: S1: Using the detection device for the filtration performance of the desalination mist filter in a simulated coastal environment as described in any one of claims 1 to 7, the test filter is installed on a workbench, the workbench is operated, background sampling and salt mist sampling are performed respectively when the test filter has an initial resistance and reaches a set final resistance value, and the air sampling bottles of the salt mist absorption device for the two samplings are taken out respectively; S2: diluting the solutions in the two air sampling bottles respectively to obtain background test solution and salt spray test solution; S3: Analyze the chloride ion content in the background test liquid and the salt spray test liquid by ion chromatography to obtain the background concentration of the initial salt spray particles and the concentration of the purified salt spray particles when the test filter reaches the set final resistance value; S4: Calculate the difference between the background concentration of the initial salt mist particles and the concentration of the purified salt mist particles when the filter reaches the set final resistance value, calculate the mass of the salt mist particles passing through the downstream of the filter, and calculate the salt mist filtration efficiency within the set resistance range based on the amount of salt mist generated upstream.

9. The method for detecting the filtering performance of a desalination mist filter in a simulated coastal environment as claimed in claim 8, characterized in that: Specifically, the test filter is installed on the test workbench to ensure good sealing, and the filter is tested at the rated air volume. After the air volume of the test workbench is stable, the initial resistance of the test filter is tested, and the salt spray absorption device is connected to the downstream of the test filter to sample, the sampling time is 0-30 minutes, the sampling flow rate is 0-10 L / min, and the background test liquid is obtained; the salt spray generating device is turned on to ensure that the atomization flow rate is maintained at 0-10 Kg / h, and the upstream humidity is maintained at 50%-100%RH. When the final resistance of the test filter is reached, the salt spray absorption device is connected again to sample, the sampling time is 0-30 minutes, and the sampling flow rate is 0-10L / min to obtain the salt spray test liquid; The background test liquid and the salt spray test liquid are diluted, filtered, and then subjected to ion chromatography analysis to obtain the background concentration of the initial salt spray particles downstream of the test filter and the concentration of the filtered salt spray particles when the test filter reaches the set final resistance value. The mass of the salt spray particles passing through the downstream of the test filter is calculated by the difference between the background concentration of the initial salt spray particles and the concentration of the purified salt spray particles when the test filter reaches the set final resistance value, and the salt spray filtration efficiency of the test filter is calculated based on the salt spray generation amount of the upstream salt spray generating device.

10. The method for detecting the filtering performance of a desalination mist filter in a simulated coastal environment as claimed in claim 9, characterized in that: The rated air volume is the air volume specified by the filter manufacturer or the air volume required by the tester. During the entire test process, the humidity upstream of the test filter is ≥85%RH.

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