CN111974773B - Method for cleaning air bag for collecting exhaled air - Google Patents
Method for cleaning air bag for collecting exhaled air Download PDFInfo
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- CN111974773B CN111974773B CN201910436784.5A CN201910436784A CN111974773B CN 111974773 B CN111974773 B CN 111974773B CN 201910436784 A CN201910436784 A CN 201910436784A CN 111974773 B CN111974773 B CN 111974773B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/46—Inspecting cleaned containers for cleanliness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
Abstract
The invention discloses a method for cleaning an air bag for collecting exhaled breath. The purge gas is used for supplying a clean gas source in the cleaning process; the mass flow meter is used for controlling the supply flow of the clean air source; two cleaning solutions are adopted, namely isopropanol and purified water; the cleaning bottle is used for containing cleaning liquid; the air bag to be cleaned is an air bag which can not meet the requirement of cleanness. The efficient cleaning method for the air bag for collecting the exhaled air solves the defects of the traditional air bag treatment method, obviously improves the cleanliness of the treated air bag, greatly improves the air bag treatment efficiency, and greatly shortens the treatment time.
Description
Technical Field
The invention relates to the fields of material analytical chemistry and exhaled breath research, in particular to a method for cleaning an air bag for exhaled breath collection.
Background
Currently, there are two main types of air bags used for the collection of exhaled breath from a person: the first is an aluminum foil gas collecting bag, and the second is a tedlar sampling bag. The aluminum foil gas collecting bag is widely applied to gas sampling and storage in departments of disease prevention, environmental monitoring, labor protection, safety supervision, military affairs, meteorology, scientific research and teaching, metallurgy, petrochemical industry, railways, building materials and the like. Can be used for filling various high-purity gases, and can also be used for filling CO and H2S, hydrocarbon and other various standard mixed gases are ideal substitute products of the rubber bladder.
The aluminum foil gas collecting bag adopts a five-layer aluminum foil composite membrane and perfluorinated membrane jacket type structure, and has the characteristics of stable chemical property, simple operation, portability, easy carrying and the like. Aluminum foilThe gas sampling bag made of composite membrane and perfluorinated membrane can store ppm (10) in a long time-6) The concentration of the general industrial gas, the petrochemical gas and the like can be kept unchanged, and low-concentration corrosive and chemically active gas can be stored within a specified time. And has excellent corrosion resistance, and is suitable for strong corrosive gases such as sulfur dioxide, hydrogen sulfide, nitrogen dioxide and the like. The aluminum foil composite membrane/perfluorinated membrane jacket type structure gas sampling bag can effectively prolong the storage time of trace corrosive gas components in the gas sampling bag, and is suitable for being used in trace corrosive gas analysis.
The tedlar sampling bag is made of a polyvinyl fluoride film, has special resistance to organic solvents, and has high mechanical strength. Can be used for sampling various gases such as inorganic gas, low-concentration organic solvent vapor and the like, and can be used in the temperature range of-70 ℃ to 100 ℃.
Currently, although analytical instruments are continuously developed and analytical precision is improved, analytical values are also improved from ppm level to ppb level. These gas bags are recyclable gas bags, but when a collecting device (collecting bag) is selected based on a gas to be collected and analyzed, if the component and concentration value of the liquation in the gas collecting bag to be analyzed cannot be accurately grasped and removed, the analytical value is inaccurate, which causes a serious problem. Therefore, it is necessary to ensure the cleanliness of the collection equipment or the collection bag while shortening the gas storage time as much as possible.
The currently used air bag treatment methods mainly have two kinds, namely heating to the temperature range of 42 ℃ to 95 ℃ and performing centralized overnight treatment. Secondly, directly blowing the mixture with clean air overnight. The first method is limited by the volume of the heating container, the number of air bags for one-time treatment is limited, meanwhile, the heating is carried out in a closed space, and after the temperature is recovered to the room temperature, secondary adsorption of pollutants is easy to generate. The second method has a significantly increased number of processing bags compared to the first method, but is not only inefficient but often fails to meet the cleanliness requirement by purging with clean gas alone.
Disclosure of Invention
The invention relates to a method for cleaning an air bag for collecting exhaled breath, which is a simple, low-cost and high-efficiency method for cleaning the air bag for collecting exhaled breath.
The invention adopts the following specific technical scheme:
the air bag cleaning method for exhaled air collection comprises a plurality of groups of air bags such as purge gas, a mass flow meter, cleaning small bottles, cleaning liquid, an air bag to be cleaned and the like. The purge gas is used for supplying a clean gas source in the cleaning process; the flowmeter is used for controlling the supply flow of the clean air source; two cleaning solutions are adopted, namely isopropanol and purified water; the cleaning bottle is used for containing cleaning liquid; the air bag to be cleaned is an air bag which can not meet the requirement of cleanness.
The specific flow of the air bag cleaning method for exhaled air collection is as follows: firstly, controlling the required flow rate of purge gas through a mass flow meter, continuously introducing the purge gas into isopropanol of cleaning liquid in a cleaning small bottle through pipeline conveying, conveying volatilized isopropanol to an inlet of an air bag to be cleaned through a pipeline by carrying the purge gas, so that the volatilized isopropanol enters the air bag from the inlet to be cleaned for cleaning, then discharging gas from an outlet of the air bag, and continuously cleaning for more than 1 hour;
secondly, replacing the isopropanol of the cleaning liquid in the cleaning small bottle with purified water to purge for a certain time, repeating the operation process of purging and cleaning in the first step, and continuously cleaning for more than 1 hour;
thirdly, unloading the small cleaning bottles, continuously purging the air bags cleaned in the first two steps by using purge gas for more than 1 hour;
and fourthly, after evacuating the purge gas in the air bag cleaned in the third step, filling clean air, and then performing air bag background test by using a mass spectrometer to ensure that the air in the air bag is evacuated for later use after cleaning, otherwise, repeating the processes from the first step to the fourth step.
The invention has the advantages that:
the currently used air bag treatment methods mainly have two kinds, namely heating to the temperature range of 42 ℃ to 95 ℃ and performing centralized overnight treatment. Secondly, directly blowing the mixture with clean air overnight. The first method is limited by the volume of the heating container, the number of air bags for one-time treatment is limited, meanwhile, the heating is carried out in a closed space, and after the temperature is recovered to the room temperature, secondary adsorption of pollutants is easy to generate. The second method has a significantly increased number of processing bags compared to the first method, but is not only inefficient but often fails to meet the cleanliness requirement by purging with clean gas alone.
The efficient cleaning method for the air bag for collecting the exhaled air solves the defects of the traditional air bag treatment method, obviously improves the cleanliness of the treated air bag, greatly improves the air bag treatment efficiency, and greatly shortens the treatment time.
Drawings
FIG. 1 is a schematic diagram of a method for cleaning a plurality of exhaled breath collection air bags;
FIG. 2 is a schematic diagram of a method for cleaning a plurality of sets of exhaled breath collection air bags;
in FIG. 1, 1 is a purge gas; 2 is a mass flowmeter; 3 is a cleaning vial; 4 is cleaning liquid; 5 is an air bag 1 to be cleaned; 6 is the air bag 2 to be cleaned; 7 is an air bag 3 to be cleaned; 8 is an inlet of the air bag 1 to be cleaned; 9 is an outlet of the air bag 1 to be cleaned; 10 is the inlet of the air bag 2 to be cleaned; 11 is an outlet of the air bag 2 to be cleaned; 12 is the inlet of the air bag 3 to be cleaned; 13 is the outlet of the air bag 3 to be cleaned.
Detailed Description
The specific flow of the air bag cleaning method for exhaled air collection is as follows: firstly, sequentially connecting 20 air bags to be cleaned to the rear end of a cleaning small bottle according to the mode of figure 1; secondly, clean compressed air is used as purge gas, the flow is controlled to be 2L/min through a flowmeter, cleaning liquid isopropanol in a small cleaning bottle is continuously purged through pipeline conveying, the volume of the isopropanol is 500mL, the purge flow rate is 1000mL/min, the purge time is 1.5 hours, the volatilized isopropanol is conveyed to an inlet of an air bag to be cleaned through a pipeline and then enters the air bag for purging and cleaning, redundant gas is connected to an inlet of the next air bag to be cleaned through an air bag outlet, the redundant gas is connected to an inlet of the next air bag to be cleaned through the air bag outlet, the redundant gas is discharged through the air bag outlet, and the rest is done in sequence, and a plurality of groups of air bags can be cleaned; and thirdly, replacing the isopropanol of the cleaning solution in the cleaning small bottle with the purified water of the cleaning solution, wherein the volume of the purified water is 500mL, the purging flow rate is 1000mL/min, and the purging time is 1.5 hours. Repeating the first step of operation; fourthly, unloading the small cleaning bottles, purging with purge gas for less than 1.5 hours at a flow rate of 2.5L/min, and continuously purging the air bags cleaned in the first two steps; and fifthly, evacuating the air bag after cleaning in the fourth step, filling a certain amount of clean air, and then performing air bag background test by using a mass spectrometer, so as to ensure that the air in the air bag is evacuated for later use after cleaning.
Claims (10)
1. A method for cleaning an air bag for collecting exhaled air adopts equipment that the blown air (1) from a blown air source is connected with the air bag to be cleaned through a mass flow meter (2) and a cleaning small bottle (3) filled with cleaning liquid (4) which are connected in series by pipelines to form a cleaning pipeline;
firstly, controlling the required flow rate of purge gas (1) through a mass flow meter (2), conveying the purge gas (1) through a pipeline and continuously introducing the purge gas into cleaning liquid (4) in a cleaning small bottle (3), wherein the cleaning liquid (4) is isopropanol, conveying volatilized isopropanol carried by the purge gas to an inlet of an air bag to be cleaned through the pipeline, so that the isopropanol enters the air bag from the inlet to be cleaned for purging, then discharging gas from an air bag outlet, and continuously cleaning for more than 1 hour;
secondly, replacing the cleaning liquid (4) in the cleaning small bottle (3) with purified water (b) from isopropanol (a), repeating the first-step purging and cleaning operation process, and continuously cleaning for more than 1 hour;
thirdly, unloading the small cleaning bottle (3), continuously purging the air bag cleaned in the first two steps by using a purging gas (1), and continuously purging for more than 1 hour;
and fourthly, after evacuating the air bag cleaned in the third step, filling clean air, and then performing air bag background test by using a mass spectrometer, ensuring that the air in the air bag is evacuated for later use after cleaning, otherwise, repeating the steps 1-4.
2. The cleaning method according to claim 1, characterized in that:
the air bags to be cleaned are 1 air bag to be cleaned or more than 2 air bags to be cleaned which are sequentially connected in series through a pipeline, or more than 2 air bags to be cleaned which are connected in parallel through a pipeline, or more than 3 air bags to be cleaned which are connected in series, in parallel and in series through a pipeline;
the purge gas (1) is used for supplying a clean gas source in the cleaning process; the mass flow meter (2) is used for controlling the supply flow of the clean air source; two cleaning liquids (4) are respectively isopropanol (a) and purified water (b); the cleaning small bottle (3) is used for containing cleaning liquid; the air bag to be cleaned is an air bag which can not meet the requirement of acquiring the required cleanliness.
3. The cleaning method according to claim 1 or 2, characterized in that:
the air bags to be cleaned are more than 3 air bags to be cleaned which are sequentially connected in series through pipelines, and the specific process is as follows: in the first step, the first step is that,
the blowing gas (1) is conveyed through a pipeline and is continuously introduced into the cleaning liquid (4) in the cleaning small bottle (3), the cleaning liquid (4) is isopropanol, the volatilized isopropanol is carried by the blowing gas and is conveyed to an inlet of the air bag to be cleaned through the pipeline, so that the isopropanol enters the air bag from the inlet to be cleaned for blowing and cleaning, then the gas is discharged from an outlet of the air bag, and the cleaning is continuously carried out for more than 1 hour;
the volatilized isopropanol is conveyed to an inlet (8) of a first air bag (5) to be cleaned through a pipeline, so that the volatilized isopropanol enters the air bag to be cleaned for purging and cleaning, redundant gas is connected to an inlet (10) of a next second air bag (6) to be cleaned through an outlet (9) of the first air bag (5) to be cleaned, redundant gas is connected to an inlet (12) of a next third air bag (7) to be cleaned through an outlet (11) of the second air bag (6) to be cleaned, redundant gas is discharged through an outlet (13) of the third air bag (7) to be cleaned, and the rest is done in sequence, and more than 3 air bags can be cleaned;
secondly, replacing the cleaning liquid (4) in the cleaning small bottle (3) with purified water (b) from isopropanol (a), repeating the first-step purging and cleaning operation process, and continuously cleaning for more than 1 hour;
thirdly, unloading the cleaning small bottle (3), continuously purging the first, second and third air bags (5), (6) and (7) cleaned in the previous two steps for more than 1 hour by using a purge gas (1);
and fourthly, evacuating the first, second and third air bags (5), (6) and (7) cleaned in the third step, filling clean air, and performing air bag background test to ensure that the air in the air bags is evacuated for later use after cleaning.
4. The cleaning method according to claim 1, characterized in that: the purge gas may be one or more of clean air, nitrogen and helium in different proportions.
5. The cleaning method according to claim 1, characterized in that: the mass flow meter (2) controls the flow of the purge gas (1) to be 1-3L/min.
6. The cleaning method according to claim 1, characterized in that: in the first step, the isopropanol purging time is 1-2 hours, the volume of the isopropanol is within 100-1000 mL, and the purging flow rate of the purging gas is 100-1000 mL/min.
7. The cleaning method according to claim 1, characterized in that: and secondly, purging the purified water for 1-2 hours, wherein the volume of the purified water is within 100-1000 mL, and the purging flow rate of the purging gas is 100-1000 mL/min.
8. The cleaning method according to claim 1, characterized in that: and thirdly, the purging time of the purging gas is 1-2 hours, and the purging flow rate of the purging gas is controlled to be 1-3L/min.
9. The cleaning method according to claim 1, characterized in that:
according to different flow rates of the purge gas (1), one path of cleaning pipeline flow control can process the number of air bags at one time in the range of 1-30; the method comprises the following steps that the purge gas (1) from a purge gas source is divided into more than 2 paths, and each path is connected with an air bag to be cleaned through a mass flow meter (2) and a cleaning small bottle (3) filled with cleaning liquid (4) which are connected in series through pipelines in sequence to form a plurality of cleaning pipelines connected in parallel; according to the different flow rates of the purge gas (1), the number of the disposable gas bags controlled by the flow rate of the multi-path cleaning pipeline is more than 2 times that of the disposable gas bags controlled by the flow rate of the one-path cleaning pipeline.
10. The method for cleaning an exhaled breath collection air bag according to claim 1 or 2, wherein:
the cleaning bottle (3) is internally provided with a top opening container for filling isopropanol (a) and a top opening container for filling purified water (b), and the two containers are respectively connected with the purging gas (1) through a guide pipe with one end extending into the liquid level through a valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910436784.5A CN111974773B (en) | 2019-05-23 | 2019-05-23 | Method for cleaning air bag for collecting exhaled air |
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| CN201910436784.5A CN111974773B (en) | 2019-05-23 | 2019-05-23 | Method for cleaning air bag for collecting exhaled air |
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| CN111974773A CN111974773A (en) | 2020-11-24 |
| CN111974773B true CN111974773B (en) | 2022-04-12 |
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Families Citing this family (2)
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| CN112827979B (en) * | 2020-12-30 | 2022-06-14 | 深圳市步锐生物科技有限公司 | Automatic cleaning device for expired air bag |
| CN113996615A (en) * | 2021-11-12 | 2022-02-01 | 安庆军峰危险货物运输有限公司 | LPG-related tank car cleaning device and method based on pressure swing adsorption technology |
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