CN108414386B - Sampling equipment of no-clean particulate matter concentration - Google Patents
Sampling equipment of no-clean particulate matter concentration Download PDFInfo
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Abstract
The invention relates to the technical field of sampling of particulate matters in catering oil fume waste gas, in particular to a sampling device for concentration of cleaning-free particulate matters. The sampling equipment for the concentration of the cleaning-free particulate matter comprises a sampling device and a sampling gun, wherein a sampling gun interface of the sampling gun is connected with an outlet of the sampling device; the sampling device comprises a first half shell, a second half shell and an oil smoke filter element; the oil smoke filter element is positioned in a cavity formed by the first half shell and the second half shell; the oil smoke filter element comprises a first membrane structure and a second membrane structure; the inlet of the sampling device is arranged on the first half shell, and the outlet of the sampling device is arranged on the second half shell; the first membrane structure comprises a polypropylene fiber filter membrane or a polytetrafluoroethylene membrane; the second membrane structure comprises a glass fibre filter membrane. The invention aims to provide a sampling device for the concentration of cleaning-free particulate matters, which has the advantages of no cleaning, easy use, simple and convenient operation and the like, and the sampling and testing of the concentration of the particulate matters in oil smoke are more scientific and accurate.
Description
Technical Field
The invention relates to the technical field of sampling of particulate matters in catering oil fume waste gas, in particular to a sampling device for concentration of cleaning-free particulate matters.
Background
The catering oil fume refers to oil and organic matters volatilized in the cooking and processing processes of food and heating decomposition or cracking products thereof. The catering oil fume is a mixture consisting of 3 types of gas-state, liquid-state and solid-state particulate matters and air, wherein most of the particulate matters are high-viscosity particulate matters formed by oil mist and water mist, and a small part of the particulate matters are solid particulate matters; the main organic components in the cooking fume are aldehyde, ketone, hydrocarbon, fatty acid, alcohol, aromatic compound, lactone, heterocyclic compound and the like. The particle size of the liquid and solid phase particles is generally less than 10 μm; the gaseous fraction is then emitted as Volatile Organic Compounds (VOCs), with a detectable number of VOCs of 300. Catering oil fume is mainly low-altitude emission, contributes to PM2.5 and other atmospheric particulate matters, can directly form PM2.5 after the oil fume is exhausted, and can generate complex photochemical reaction in air and form PM2.5 and O3 pollution on the other hand.
With the development of social economy and the increase of the income of residents, large and small restaurants in each city bloom all over time, so that the oil smoke pollution brings new problems to the urban environment while the life of people is facilitated. At present, in urban atmospheric pollution sources, catering oil fume pollution, industrial pollution and automobile exhaust pollution are main pollution sources. The urban environmental pollution complaints about 50% of the total complaints of the oil smoke pollution complaints in the Chinese food and beverage service line industry. The technical policy for preventing and treating environmental air fine particulate matter pollution (the quotation of comments) published by the ministry of environmental protection at the day ago is also put forward, and PM2.5 emission is reduced by controlling food and drink pollution.
At present, China continues to use the oil smoke emission standard of the catering industry (GB 18483-2001) published in 2001, and the maximum allowable emission concentration of oil smoke of the catering industry unit is regulated to be 2.0mg/m3However, emission limits for particulate matter and VOCs are not specified; and the analysis method for measuring the concentration of the oil smoke by adopting metal filter cartridge absorption and infrared spectrophotometry is specified in the standard. The method adopts a constant-speed sampling method to extract gas in an oil fume exhaust cylinder and adsorb oil fume in an oil fume metal filter cylinder; and (3) placing the collecting filter element which collects the oil smoke in a polytetrafluoroethylene sleeve with a cover, returning to a laboratory, performing ultrasonic cleaning by using carbon tetrachloride as a solvent, moving into a colorimetric tube for constant volume, and determining the content of the oil smoke by using an infrared spectrophotometry. The standard sampling and analysis method has the following technical disadvantages: (1) the metal filter cylinder used in the oil smoke detection needs to be cleaned after each test, the cleaning operation is complex, and a large amount of chemical reagents such as carbon tetrachloride are consumed; (2) the requirements on sampling time and sampling working conditions are high, and some small catering devices can hardly meet the requirements; (3) the infrared spectrophotometry is based on the determination of the absorbance at the characteristic bands of CH, CH2 and CH3, and the test objects are incomplete and have poor representativeness; (4) the test operation is complex and the workload is large.
Emission limits of particulate matters and VOCs (volatile organic compounds) are regulated and increased in emission standards of part local catering industry, but the existing method for measuring particulate matters in exhaust gas of fixed pollution sources and sampling gaseous pollutants (GB/T16157-1996) is not suitable for detecting the concentration of the particulate matters in catering oil smoke, mainly because the method comprises the following steps: (1) the test method is only suitable for the mass concentration of the particulate matters higher than 50mg/m3Measured at less than 50mg/m3The error is larger when the particles are in the process of being used; (2) according to the testing method, the glass fiber filter cylinder is adopted to filter particles, the lipophilicity of the glass fiber filter cylinder is poor, the bearing capacity of the oil smoke organic particles is low, and the oil smoke organic particles are easy to penetrate; (3) the glass fiber filter cartridge has a complex shape and needs to be sampled every timeComplex and difficult cleaning operation is carried out on parts such as a sampling nozzle, a front bent pipe, a sampling pipe main body and the like, and chemical reagents such as acetone, carbon tetrachloride and the like are consumed for cleaning; (4) the humidity of the catering oil fume is high due to operations such as cooking of food, the glass fiber filter cartridge is influenced by the high humidity of the oil fume, the strength of the glass fiber filter cartridge is obviously reduced, and the filter cartridge is easy to break when being clamped by tweezers after sampling, so that a test error is caused, and the technical requirement on operators is high.
In summary, the existing testing method is not suitable for detecting the concentration of the particulate matters mainly containing organic matters and high viscosity of the catering oil fume, and the sampling device of the method is difficult to clean manually, uses a large amount of chemical reagents, and has inaccurate testing and the like.
Therefore, it is urgently needed to provide a new sampling device for the concentration of the cleaning-free particulate matters.
Disclosure of Invention
The invention aims to provide a sampling device for the concentration of cleaning-free particulate matters, which has the advantages of no cleaning, easy use, simple and convenient operation and the like, and the sampling and testing of the concentration of the particulate matters in oil smoke are more scientific and accurate.
Based on the purpose, the cleaning-free particulate matter concentration sampling equipment provided by the invention comprises a sampling device and a sampling gun, wherein a sampling gun interface of the sampling gun is connected with an outlet of the sampling device;
the sampling device comprises a first half shell, a second half shell and an oil smoke filter element; the oil smoke filter element is positioned in a cavity formed by the first half shell and the second half shell;
the oil smoke filter element comprises a first membrane structure and a second membrane structure;
the inlet of the sampling device is arranged on the first half shell, and the outlet of the sampling device is arranged on the second half shell; the first half shell, the first membrane structure, the second membrane structure and the second half shell are arranged in sequence along the direction from the inlet to the outlet;
the first membrane structure comprises a polypropylene fiber filter membrane or a polytetrafluoroethylene membrane; the second membrane structure comprises a fiberglass filter membrane.
Optionally, the sampling gun comprises a temperature sensor for sensing the temperature of the gas sampled by the sampling device.
Optionally, the sampling gun further comprises a pitot tube anemometer for measuring the flow rate of the gas sampled by the sampling device;
the sampling gun further comprises a controller, wherein the controller is electrically connected with the temperature sensor and the pitot tube anemometer and used for receiving information and displaying the information on a display screen of the controller.
Optionally, the sampling device further comprises a soot protection membrane; the oil smoke protective film is arranged on the periphery of the first half shell.
Optionally, the oil smoke filter element comprises a sampling pipe and a filter element cover, the sampling pipe is connected with the filter element cover, and an inner cavity of the sampling pipe is communicated with an inner cavity of the filter element cover;
the first membrane structure and the second membrane structure are respectively positioned inside the filter element cover; said first membrane structure being adjacent to said sampling tube relative to said second membrane structure;
the sampling tube extends out of the first half shell.
Optionally, the first membrane structure further comprises an insulating support mesh; the spacer support mesh is adjacent to the second membrane structure relative to the polypropylene fiber filter membrane or the polytetrafluoroethylene membrane.
Optionally, the second membrane structure further comprises a filter membrane guard; the filter membrane guard is distal to the first membrane structure relative to the fiberglass filter membrane.
Optionally, the first housing half comprises a gland and a first shell;
the first housing is located between the gland and the second half shell, the first housing and the second half shell forming the cavity;
the gland is detachably connected with the second half shell.
Optionally, a first sealing ring is arranged between the gland and the first shell; and a second sealing ring is arranged between the filter element cover and the second half shell.
Optionally, a protective tube is arranged outside the first shell, the protective tube extends out of the gland, and the shape of the protective tube is matched with that of the sampling tube;
the sampling pipe is inserted into and extends out of the protective pipe, and the outer wall of the sampling pipe is in sealing contact with the inner wall of the protective pipe.
The invention has the beneficial effects that:
the invention provides a sampling device for the concentration of cleaning-free particles, which comprises a sampling device and a sampling gun; sampling the particulate matters through a detachable sampling device; the sampling device adopts the first half shell and the second half shell to protect the oil smoke filter element, so that the influence of the flow velocity of oil smoke on the detection result of the oil smoke filter element is reduced; the sampling device adopts a double-layer membrane structure to realize the effective detection of the high viscosity of the catering oil fume and the concentration of organic matter-based particulate matters, and the test structure is accurate and reliable; specifically, the first membrane structure comprises a polypropylene fiber filter membrane or a polytetrafluoroethylene membrane and is used for filtering and absorbing liquid oil in oil smoke, and the oil mass can be quickly absorbed by utilizing the superfine fiber structure and good hydrophobicity and lipophilicity of the filter membrane of the first membrane structure, and can reach 6-20 times of the oil mass of the filter membrane; the second membrane structure comprises a glass fiber filter membrane, has good hydrophobicity and is used for filtering other particulate matters in the oil smoke; the first membrane structure and the second membrane structure greatly reduce the interference of water in the particles of the catering lampblack in material selection; the first membrane structure and the second membrane structure are respectively positioned in the oil smoke filter element, and the problem that the sampling device is difficult to clean manually and the problem that toxic reagents are required to be used for cleaning are avoided by replacing the disposable oil smoke filter element, so that the oil smoke sampling device is simple and convenient to operate, low in cost and simple in test steps and process; the particulate matter passes through in proper order first membrane structure second membrane structure adopts bilayer membrane filtration mode to gather the particulate matter of oil smoke class in the food and beverage waste gas on the filter membrane of first membrane structure with on the filter membrane of second membrane structure, measure through whole weighing method the weight around the oil smoke filter core detects the particulate matter, calculates the concentration of particulate matter according to the weight difference, has both reduced the laboratory and to the quantitative measurement of washing liquid, drying and the operation of weighing, has also saved a large amount of analysis work volume for particulate matter concentration test is simple and easy, has improved work efficiency greatly. To sum up, this sampling equipment is through adopting disposable oil smoke filter core for have when detecting the particulate matter concentration of oil smoke class characteristics such as exempt from to wash, easy to use, easy and simple to handle, test result are more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a cleaning-free particle concentration sampling apparatus according to a second embodiment of the present invention;
fig. 2 is an exploded view of a device for sampling a concentration of cleaning-free particles according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a cleaning-free particle concentration sampling apparatus according to a third embodiment of the present invention;
fig. 4 is a partially enlarged view of the wash-free particulate concentration sampling apparatus shown in fig. 3.
Reference numerals:
1-a first half-shell; 11-a gland; 12-a first housing;
121-protective pipe; 2-a second half-shell;
3-oil smoke filter element; 31-a first membrane structure; 311-an isolated support network;
32-a second membrane structure; 321-filter membrane protecting net; 33-a sampling tube;
34-a filter element cover; 4-an inlet; 5-an outlet;
6-oil smoke protective film; 7-a first sealing ring; 8-a second sealing ring;
9-a sampling gun; 91-a sampling device; 92-a temperature sensor;
93-pitot tube anemometer; 94-controller.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
The embodiment provides a method for detecting the concentration of cleaning-free particles, which is characterized in that the concentration of the particles is detected by a detachable sampling device based on a weighing method;
the sampling device comprises a first half shell, a second half shell and an oil smoke filter element; the oil smoke filter element is positioned in a cavity formed by the first half shell and the second half shell; the first half shell and the second half shell can be made of stainless steel or polytetrafluoroethylene materials, but are not limited to the stainless steel or the polytetrafluoroethylene materials;
the oil smoke filter element comprises a first membrane structure and a second membrane structure;
the inlet of the sampling device is arranged on the first half shell, and the outlet of the sampling device is arranged on the second half shell; the first half shell, the first membrane structure, the second membrane structure and the second half shell are arranged in sequence along the direction from the inlet to the outlet; preferably, the inlet of the sampling device is a pre-cutting conical sampling nozzle, and a proper pre-cutting section can be selected according to the flow rate of the sampling gas;
the first membrane structure comprises a polypropylene fiber filter membrane or a polytetrafluoroethylene membrane and other hydrophobic filter membranes; the second membrane structure comprises a fiberglass filter membrane. The first membrane structure and the second membrane structure are made of the materials, so that the weight of the oil smoke filter element is greatly reduced, and the weight can be controlled within 15 g; the polypropylene fiber filter membrane is suitable for detecting oil fume particulate matters with the temperature not higher than 100 ℃, has good strength, cannot deform, has no medium falling off, and improves the accuracy and precision of particulate matter concentration test; the polytetrafluoroethylene membrane is suitable for detecting oil fume particulate matters with the temperature not higher than 260 ℃; the glass fiber membrane is suitable for detecting oil fume particulate matters with the temperature not higher than 260 ℃.
The sampling device also comprises an oil smoke protective film; the oil smoke protective film is arranged on the periphery of the first half shell. The surface area of the lampblack protection film is not less than the outer surface area of the first half shell, and the lampblack protection film can cover the periphery of the first half shell except the inlet; the surface area of the smoke protection film may be greater than the outer surface area of the first half shell, and the smoke protection film may cover the outer circumference of the first half shell except the inlet, and partially cover the outer circumference of the second half shell or the outer circumference of the second half shell except the outlet. By adopting the disposable oil fume protective film, the oil fume is prevented from being adsorbed and polluted on the outer surface of the sampling device, particularly the outer surface of the first half shell; cleaning operations of the outer surface of the sampling device, in particular of the first half-shell, are avoided.
The material of the oil smoke protective film can be but is not limited to a polytetrafluoroethylene film, a flame-retardant PP film, a heat-resistant rubber film or other heat-resistant composite films and the like; preferably, the thickness of the oil smoke protection film is not more than 0.8 mm.
In the embodiment, the method for detecting the concentration of the cleaning-free particles samples the particles by a detachable sampling device; the sampling device adopts the first half shell and the second half shell to protect the oil smoke filter element, so that the influence of the flow velocity of oil smoke on the detection result of the oil smoke filter element is reduced; the sampling device adopts a double-layer membrane structure to realize the effective detection of the high viscosity of the catering oil fume and the concentration of organic matter-based particulate matters, and the test structure is accurate and reliable; specifically, the first membrane structure comprises a polypropylene fiber filter membrane or a polytetrafluoroethylene membrane and is used for filtering and absorbing liquid oil in oil smoke, and the oil mass can be quickly absorbed by utilizing the superfine fiber structure and good hydrophobicity and lipophilicity of the filter membrane of the first membrane structure, and can reach 6-20 times of the oil mass of the filter membrane; the second membrane structure comprises a glass fiber filter membrane, has good hydrophobicity and is used for filtering other particulate matters in the oil smoke; the first membrane structure and the second membrane structure greatly reduce the interference of water in the particles of the catering lampblack in material selection; the first membrane structure and the second membrane structure are respectively positioned in the oil fume filter element, the problem that the sampling device is difficult to clean manually is solved by replacing the disposable oil fume filter element, the problem that toxic reagents are required to be used for cleaning is also solved, and the device is simple and convenient to operate, low in cost, simple in test steps and process and easy to manufacture in batches; the particulate matter passes through in proper order first membrane structure second membrane structure adopts bilayer membrane filtration mode to gather the particulate matter of oil smoke class in the food and beverage waste gas on the filter membrane of first membrane structure with on the filter membrane of second membrane structure, measure through whole weighing method the weight around the oil smoke filter core detects the particulate matter, calculates the concentration of particulate matter according to the weight difference, has both reduced the laboratory and to the quantitative measurement of washing liquid, drying and the operation of weighing, has also saved a large amount of analysis work volume for particulate matter concentration test is simple and easy, has improved work efficiency greatly.
The method for detecting the concentration of the cleaning-free particles in the embodiment comprises the following steps:
step 100, measuring the net weight of the oil smoke filter element, wherein the net weight value m1 is obtained;
step 200, assembling the sampling device; connecting the sampling device with a sampling gun;
300, placing the inlet of the sampling device back to the sampling airflow into a flue or a chimney, and setting the sampling flow and the volume V of the sampling gun; rotating the sampling gun to enable the inlet of the sampling device to sample the sampling airflow;
step 400, removing water from the oil fume filter element after sampling, weighing, and recording a weighing weight value m 2;
step 500, calculating the concentration of the particulate matter, wherein the calculation formula is as follows: (m2-m 1)/V.
Specifically, the method comprises the following steps:
firstly, before sampling, the oil smoke filter element is prepared: the soot filter should be prepared before each test. The method comprises the following steps of (1) assembling a disposable oil fume filter element, then placing the oil fume filter element into an oven (with the precision of +/-5 ℃) to dry for at least 1h at the temperature of 100 +/-5 ℃, taking out the oil fume filter element to cool for at least 2h to room temperature on a support frame in a dryer (silica gel desiccant), and then weighing by using an analytical balance (with the resolution of 0.1mg/0.01mg) until the constant weight m1 (namely the change of the two weighing times before and after the first time is not more than 0.5mg), namely the net weight value m1 of the oil fume filter element; then sealing the inlet of the oil smoke filter element, putting the oil smoke filter element into a plastic sealing bag, and putting the plastic sealing bag into a protection box;
the oil smoke filter elements need to be numbered before weighing, and each weighing component needs to keep uniqueness and traceability. The weighing is carried out by shortening the operation time and eliminating the influence of static electricity. Recording the empty weight weighing result of the oil smoke filter element to be accurate to 0.5 mg;
secondly, assembling the sampling device and checking air tightness: firstly, taking the oil fume filter element out of the plastic sealing bag, and putting the oil fume filter element into a cavity formed by the first half shell and the second half shell to finish the assembly of the sampling device; then connecting the outlet of the sampling device with a sampling gun; finally, sleeving the disposable oil smoke protective film on the outer surface of the sampling device, namely sleeving the disposable oil smoke protective film on the outer surface of the first half shell, and sealing the inlet of the sampling device; then starting a sampling gun, namely starting a sampling pump in the sampling gun, wherein the negative pressure of an extraction system is 6-8 kPa, and the gas tightness is checked by adopting a flow method, and the gas leakage rate is not more than 400-600 ml/2 min or the system negative pressure is not reduced by more than 0.2-0.4 kPa within 30 s;
thirdly, sampling in site: unsealing an inlet of the sampling device, putting the assembled inlet of the sampling device back to the sampling airflow into a flue or a chimney, selecting a sampling point and a sampling nozzle of the sampling device for sampling according to the relevant technical specification in GB/T16157-1996, and setting the sampling flow and the volume V in the sampling gun; rotating the sampling gun to enable the inlet of the sampling device to sample the sampling airflow, controlling the equal speed to be between 85% and 115%, and enabling the sampling volume V to be not less than 0.8m3；
Fourthly, weighing the oil smoke filter element after sampling: taking the oil fume filter element off the sampling device, sealing the inlet of the oil fume filter element, putting the oil fume filter element into a plastic sealing bag, putting the oil fume filter element into a protection box, and taking the oil fume filter element back to a laboratory for analysis; in order to reduce the influence of volatilization of organic components in the oil fume particles on the accuracy of a test result in the drying process, two methods are adopted for drying the oil fume filter core after sampling:
firstly, a normal-temperature drying method is suitable for sampling the oil fume filter element with lower air flow humidity, the sampled oil fume filter element is taken out from a sealing bag and is placed on a support frame of a dryer, a newly regenerated silica gel drying agent (the color change rate is not more than 10%) is placed in the dryer, the drying time at normal temperature and normal pressure is not less than 24 hours, then an analytical balance (the resolution is 0.1mg/0.01mg) is used for weighing until the weight is constant (namely the weight change of the two times before and after weighing is not more than 0.5mg), and the weighing result m2 of the filter element after sampling is recorded;
secondly, the vacuum freeze-drying method is suitable for sampling the oil smoke filter core with larger air current humidity, adopts a gland type vacuum freeze-drying machine for drying, takes out the oil smoke filter core from the sealing bag and puts the oil smoke filter core into a tray, and the drying procedure is as follows: in the pre-freezing process (the temperature is reduced to-20 ℃ to-35 ℃ by intermediate-speed freezing and is kept for 2-4 hours) → sublimation drying (the temperature is raised to-5 ℃ to 5 ℃ and is dried for 1-2 hours), and → desorption drying (the temperature is raised to 15-25 ℃ and is dried for 2-4 hours); then putting the filter element into a dryer for drying for not less than 24 hours at normal temperature and normal pressure, then weighing the filter element by using an analytical balance (the resolution is 0.1mg/0.01mg) until the weight is constant (namely the weight change of the two times before and after the weighing is not more than 0.5mg), and recording the weighing result m2 of the filter element after sampling;
fifthly, calculating the particulate matter concentration: the concentration of the particulate matters is (m2-m 1)/V. In order to ensure the accuracy of the test, the weight gain of the oil smoke particles on the filter membrane is not less than 3 mg.
Preferably, the detection limit of the particles of the oil smoke class of the method is not more than 1mg/m3。
The normal temperature drying method and the vacuum freeze drying method are selected according to the humidity condition of the sampling air flow.
Example two
In order to better implement the method for detecting the concentration of the cleaning-free particulate matter according to the first embodiment of the present invention, the present invention further provides a sampling device for implementing the concentration of the cleaning-free particulate matter according to the present invention, and the following describes an implementation of the sampling device for the concentration of the cleaning-free particulate matter according to the present invention in detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the present embodiment provides a sampling device for the concentration of cleaning-free particles; FIG. 1 is a schematic structural diagram of the sampling device; FIG. 2 is an exploded view of the sampling device; for a clearer structure, fig. 1 shows a sectional view of the sampling device, and fig. 2 shows a sectional view of the soot filter.
Referring to fig. 1 and fig. 2, the sampling device for the concentration of the cleaning-free particulate matter provided by the present embodiment includes a first half shell 1, a second half shell 2, and an oil smoke filter element 3; the lampblack filter element 3 is positioned in a cavity formed by the first half shell 1 and the second half shell 2;
the soot filter element 3 comprises a first membrane structure 31 and a second membrane structure 32;
the inlet 4 of the sampling device is arranged on the first half-shell 1, and the outlet 5 thereof is arranged on the second half-shell 2; the first half-shell 1, the first membrane structure 31, the second membrane structure 32 and the second half-shell 2 are in this order along the direction from the inlet 4 to the outlet 5;
the first membrane structure 31 comprises a polypropylene fiber filter membrane or a polytetrafluoroethylene membrane; the second membrane structure 32 comprises a glass fibre filter membrane.
The sampling device also comprises an oil fume protective film 6; the oil smoke protective film 6 is arranged on the periphery of the first half shell 1.
The device for sampling the concentration of the cleaning-free particulate matter in this embodiment has the advantages of the method for detecting the concentration of the cleaning-free particulate matter in the first embodiment, and the advantages of the method for detecting the concentration of the cleaning-free particulate matter disclosed in the first embodiment are not described again.
In this embodiment, the first membrane structure 31, the second membrane structure 32, and the soot protection membrane 6 have been described in detail in the first embodiment, and are not repeated here.
In an alternative of this embodiment, the lampblack filter element 3 comprises a sampling pipe 33 and a filter element cover 34, the sampling pipe 33 is connected with the filter element cover 34, and an inner cavity of the sampling pipe 33 is communicated with an inner cavity of the filter element cover 34;
the first membrane structure 31 and the second membrane structure 32 are respectively located inside the filter element housing 34; said first membrane structure 31 is adjacent to said sampling tube 33 with respect to said second membrane structure 32;
the sampling tube 33 protrudes from the first half-shell 1. Passing through the sampling tube 33 so that the particles enter the filter element housing 34, and collecting the particles through the first membrane structure 31 and the second membrane structure 32; the first membrane structure 31 and the second membrane structure 32 are protected by the filter element cover 34, and the first membrane structure 31 and the second membrane structure 32 are prevented from being damaged when the lampblack filter element 3 is taken out.
The sampling pipe 33 can be a straight pipe or an externally-connected bent pipe, and can be specifically set according to the direction of sampling airflow;
the sampling pipe 33, the filter element cover 34, the isolation support net 311 and the filter membrane guard net 321 are made of materials which are not limited to copper, iron, stainless steel, aluminum alloy, plastic, ceramic and the like; preferably, the sampling tube 33, the filter element cover 34, the isolation support net 311 and the filter membrane protection net 321 are made of light materials such as aluminum, aluminum alloy and plastic; preferably, the sampling tube 33, the filter element cover 34, the isolation support net 311 and the filter membrane protection net 321 are made of plastics, and the plastics are one or more of polypropylene, PVDF and PFTE.
The first membrane structure 31 further comprises a spacer support mesh 311; the separation support net 311 is close to the second membrane structure 32 with respect to the polypropylene fiber filter membrane or the polytetrafluoroethylene membrane. The filter membrane of the first membrane structure 31 and the filter membrane of the second membrane structure 32 are isolated by the isolation support net 311, and the filter membrane of the first membrane structure 31 and the filter membrane of the second membrane structure 32 are protected.
The second membrane structure 32 further comprises a filter membrane guard 321; the filter membrane guard 321 is remote from the first membrane structure 31 with respect to the glass fibre filter membrane. The filter membrane of the second membrane structure 32, i.e. the glass fibre filter membrane, is protected by the filter membrane guard 321.
In a further alternative of this embodiment, the first half-shell 1 comprises a gland 11 and a first housing 12;
the first shell 12 is located between the gland 11 and the second half-shell 2, the first shell 12 and the second half-shell 2 forming the cavity;
the gland 11 is detachably connected to the second half-shell 2. When the sampling device is buckled, the first shell 12 and the second half-shell 2 are relatively static, and only the pressing cover 11 needs to be screwed or moved, so that the oil smoke filter element 3 in the cavity formed by the first shell 12 and the second half-shell 2 is protected, and the damage to the structure of the oil smoke filter element 3 caused by assembling the sampling device is reduced; through gland 11 first casing 12 with the protection of second half shell 2 oil smoke filter core 3 has reduced the velocity of flow of oil smoke and has been to the influence of oil smoke filter core 3 testing result.
The connection mode of the gland 11 and the second half shell 2 can be threaded connection, snap connection or other connection modes; preferably; the gland 11 is screwed to the second half-shell 2.
The gland, the first shell and the second half shell are made of copper, iron, stainless steel, aluminum alloy, plastic, ceramic and the like; preferably, the gland, the first shell and the second half shell are made of the same material, and the material is stainless steel.
In order to improve the accuracy of collecting particulate matters by the lampblack filter element 3, a first sealing ring 7 is arranged between the gland 11 and the first shell 12; a second sealing ring 8 is arranged between the filter element cover 34 and the second half shell 2; to prevent the sample gas from leaking out.
In order to protect the sampling tube 33, a protective tube 121 is arranged outside the first shell 12, the protective tube 121 extends out of the gland 11, and the shape of the protective tube 121 is adapted to the shape of the sampling tube 33;
the sampling tube 33 is inserted into and extends out of the protective tube 121, and the outer wall of the sampling tube 33 is in sealing contact with the inner wall of the protective tube 121; the inlet of the sampling pipe 33 is a pre-cut conical sampling nozzle, and an appropriate pre-cut section can be selected according to the flow rate of the sampling gas.
That is, the inlet 4 of the sampling device is the inlet of the sampling tube 33; and an outlet connector communicated with the second half shell 2 is arranged on the second half shell 2, and the outlet connector is an outlet 5 of the sampling device.
The second half-shell 2 further comprises a mesh-shaped or sieve-plate-shaped filter membrane support, and the filter membrane support is connected with the outlet joint.
EXAMPLE III
Referring to fig. 3 and 4, this embodiment provides a cleaning-free particulate matter concentration sampling apparatus, which includes the cleaning-free particulate matter concentration sampling device of the second embodiment; the technical solution disclosed in the second embodiment also belongs to the second embodiment, and the description of the second embodiment is not repeated.
Fig. 3 is a schematic structural diagram of the cleaning-free particle concentration sampling apparatus provided in this embodiment, and the diagram shows a state in which a gun head of a sampling gun is inserted into a chamber of a sampling gas, where the direction of an arrow shown in the diagram is a flow velocity direction of the sampling gas; fig. 4 is a partially enlarged view of the wash-free particulate concentration sampling apparatus shown in fig. 3.
Referring to fig. 3 and 4, the cleaning-free particulate matter concentration sampling apparatus provided by this embodiment includes a cleaning-free particulate matter concentration sampling device;
the sampling device further comprises a sampling gun 9, and a sampling gun interface of the sampling gun 9 is connected with an outlet of the sampling device 91; so that the sampling device 91 of the second embodiment can sample the particulate matters through the sampling gun 9.
The sampling gun 9 comprises a temperature sensor 92, wherein the temperature sensor 92 is used for sensing the temperature of the gas sampled by the sampling device 91;
the sampling gun 9 further comprises a pitot tube anemometer 93, wherein the pitot tube anemometer 93 is used for measuring the flow rate of the gas sampled by the sampling device 91;
the sampling gun 9 further comprises a controller 94, and the controller 94 is electrically connected with the temperature sensor 92 and the pitot tube anemometer 93 and is used for receiving information and displaying the information on a display screen of the controller 94. The temperature of the sampled gas is sensed by the temperature sensor 92, the flow rate of the sampled gas is measured by the pitot tube anemometer 93 and is displayed on the controller 94, so that more information can be obtained when people measure the concentration of the particulate matters in the catering oil fume, and the concentration data of the particulate matters is more comparable.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The sampling equipment for the concentration of the cleaning-free particles is characterized by comprising a sampling device and a sampling gun, wherein a sampling gun interface of the sampling gun is connected with an outlet of the sampling device;
the sampling device comprises a first half shell, a second half shell and an oil smoke filter element; the oil smoke filter element is positioned in a cavity formed by the first half shell and the second half shell;
the oil smoke filter element comprises a first membrane structure and a second membrane structure;
the inlet of the sampling device is arranged on the first half shell, and the outlet of the sampling device is arranged on the second half shell; the first half shell, the first membrane structure, the second membrane structure and the second half shell are arranged in sequence along the direction from the inlet to the outlet;
the first membrane structure is a polypropylene fiber filter membrane or a polytetrafluoroethylene membrane; the second membrane structure is a glass fiber filter membrane.
2. The wash-free particulate matter concentration sampling apparatus according to claim 1, wherein the sampling gun comprises a temperature sensor for sensing a temperature of the gas sampled by the sampling device.
3. The wash-free particulate matter concentration sampling apparatus of claim 2, wherein the sampling gun further comprises a pitot tube anemometer for measuring a flow rate of gas sampled by the sampling device;
the sampling gun further comprises a controller, wherein the controller is electrically connected with the temperature sensor and the pitot tube anemometer and used for receiving information and displaying the information on a display screen of the controller.
4. The wash-free particulate matter concentration sampling apparatus of claim 1, wherein the sampling device further comprises a soot protection membrane; the oil smoke protective film is arranged on the periphery of the first half shell.
5. The cleaning-free particulate matter concentration sampling device of claim 1, wherein the lampblack filter element comprises a sampling pipe and a filter element cover, the sampling pipe is connected with the filter element cover, and an inner cavity of the sampling pipe is communicated with an inner cavity of the filter element cover;
the first membrane structure and the second membrane structure are respectively positioned inside the filter element cover; said first membrane structure being adjacent to said sampling tube relative to said second membrane structure;
the sampling tube extends out of the first half shell.
6. The wash-free particulate matter concentration sampling apparatus of claim 5, wherein the first membrane structure further comprises an isolation support mesh; the spacer support mesh is adjacent to the second membrane structure relative to the polypropylene fiber filter membrane or the polytetrafluoroethylene membrane.
7. The wash-free particulate matter concentration sampling apparatus of claim 5, wherein the second membrane structure further comprises a filter membrane guard; the filter membrane guard is distal to the first membrane structure relative to the fiberglass filter membrane.
8. The wash-free particulate matter concentration sampling apparatus according to claim 5, wherein the first housing half comprises a gland and a first housing;
the first housing is located between the gland and the second half shell, the first housing and the second half shell forming the cavity;
the gland is detachably connected with the second half shell.
9. The wash-free particulate matter concentration sampling apparatus according to claim 8, wherein a first sealing ring is disposed between the gland and the first housing; and a second sealing ring is arranged between the filter element cover and the second half shell.
10. The wash-free particulate matter concentration sampling device according to claim 8, wherein a protection tube is arranged outside the first shell, the protection tube extends out of the gland, and the shape of the protection tube is adapted to the shape of the sampling tube;
the sampling pipe is inserted into and extends out of the protective pipe, and the outer wall of the sampling pipe is in sealing contact with the inner wall of the protective pipe.
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| CN201810154879.3A CN108414386B (en) | 2015-07-10 | 2015-07-10 | Sampling equipment of no-clean particulate matter concentration |
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| CN201810154879.3A CN108414386B (en) | 2015-07-10 | 2015-07-10 | Sampling equipment of no-clean particulate matter concentration |
| CN201510404349.6A CN104964891B (en) | 2015-07-10 | 2015-07-10 | The detection method and sampling apparatus and sample devices of particle concentration free of cleaning |
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| CN105954067A (en) * | 2016-04-26 | 2016-09-21 | 中南大学 | Sampling film and method for detection and analysis of iron ore sintering flue gas ultrafine particles by using sampling film |
| CN108801711A (en) * | 2017-05-05 | 2018-11-13 | 中国辐射防护研究院 | A kind of aerosol sampler quickly connected |
| CN107238548B (en) * | 2017-08-17 | 2023-06-23 | 青岛众瑞智能仪器股份有限公司 | Sampling and weighing integrated beta-ray smoke mass weighing instrument |
| CN109580446A (en) * | 2017-09-29 | 2019-04-05 | 宁波方太厨具有限公司 | A kind of fume exhauster grease separating degree detection method |
| CN107843697B (en) * | 2017-12-07 | 2023-12-12 | 北京市环境保护科学研究院 | Dining waste gas simulation generating device |
| CN109708989B (en) * | 2018-12-28 | 2021-10-01 | 扬州大学 | Device for measuring contents of oil, water and particulate matters in gas and using method thereof |
| CN112763276A (en) * | 2020-10-22 | 2021-05-07 | 清华大学 | Particulate matter sampling device |
| CN113432932A (en) * | 2021-06-08 | 2021-09-24 | 北京市劳动保护科学研究所 | Catering oil smoke pollutant sampling device |
| CN113405867B (en) * | 2021-07-26 | 2023-03-28 | 天津环科环境规划科技发展有限公司 | Particulate matter sampling device and particulate matter detection device |
| CN114636637B (en) * | 2022-05-07 | 2023-09-01 | 青岛海洋地质研究所 | In-situ measurement device for suspended matter concentration and working method |
| CN115350538B (en) * | 2022-06-23 | 2024-01-23 | 浙江峰佳针织有限公司 | Filter cartridge and filter membrane assembly for clean workshop sampling gun |
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| CN104964891B (en) | 2018-07-06 |
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