CN108896429B - Standard gas emission device with controllable release rate and application thereof - Google Patents
Standard gas emission device with controllable release rate and application thereof Download PDFInfo
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- 230000007613 environmental effect Effects 0.000 claims abstract description 34
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- 238000012360 testing method Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000002791 soaking Methods 0.000 claims abstract description 13
- 238000010998 test method Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 26
- 238000013270 controlled release Methods 0.000 claims description 15
- 238000011084 recovery Methods 0.000 claims description 10
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- 230000000694 effects Effects 0.000 description 2
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- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
The invention relates to the technical field of environmental protection, in particular to a standard gas emission device with controllable release rate. The technical problem to be solved is that the accuracy of the results of testing different pollutant release rates of different materials of the environmental chamber can be effectively evaluated without any device or measure. Comprises a closed container for holding volatile liquid; the emission device is inserted into the closed container and comprises a soaking part and an emission part, the soaking part is soaked in the liquid, and the emission part is positioned outside the closed container; and the inner core is arranged in the emission device and is used for controlling the volatilization speed of the volatile substances. The release rate controllable standard gas emission device and the test method have the following advantages: the standard gas emission device with the controllable release rate effectively evaluates the accuracy of the results of testing different pollutant release rates of different materials by the environmental chamber.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a release rate controllable standard gas emission device and application thereof.
Background
Nowadays, with the increase of environmental awareness of people, the requirements for personal health, living environment and pollution degree of used articles are higher and higher. Meanwhile, along with the improvement of the living standard of people and the development of science and technology of various industries, the compound fertilizer brings corresponding harm to people while bringing benefits to people, for example, when houses are decorated, various chemical preparations, decoration materials and furniture can emit volatile gas which is harmful to body health, such as formaldehyde and the like; for children, manufacturers often use cheap materials which are not processed by strict processing technology to produce various children products such as toys and the like in order to reduce cost, and great harm is brought to the health of children in the growth and development period. Therefore, effective measures for detecting and treating harmful substances are already problems to be solved.
In recent years, the evaluation of the content of harmful substances in building materials, toys, automotive interior materials, and polymer materials has been gradually shifted from a pollutant content to a pollutant emission evaluation system based on a dynamic environmental chamber. Various domestic and foreign standards such as GB 18580-. Significant progress and rapid development has also been made in the technical means of detecting and treating harmful substances.
For the judgment of the accuracy of detecting the concentration of the volatile substances in an environment chamber, the emission rate of various compounds is required to be predictable and controllable, is in the same order of magnitude as the emission rate of an actual product, and has good repeatability and stability. The detection accuracy of the environmental chamber can be accurately judged under the strict condition.
However, at present, no device or measure is available for effectively evaluating the accuracy of the results of the environmental chamber testing different materials for different pollutant release rates.
Disclosure of Invention
The invention mainly aims to provide a standard gas emission device with a novel structure and controllable release rate and application thereof, and aims to solve the technical problem that the accuracy of the results of testing different pollutant release rates of different materials in an environmental chamber can be effectively evaluated without any device or measure.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. According to the present invention, there is provided a standard vapor-dispensing device with a controlled release rate, comprising:
the closed container is used for containing volatile liquid;
the emission device is inserted into the closed container and comprises a soaking part and an emission part, the soaking part is soaked in the liquid, and the emission part is positioned outside the closed container;
and the inner core is arranged in the emission device and is used for controlling the volatilization speed of the volatile substances.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the controlled release rate standard vapor-dispensing device described above, wherein the sealed container comprises a cup and a first end cap for sealing an opening at an end of the cup.
Preferably, the above-mentioned standard dispensing device with controllable release rate, wherein the dispensing device comprises a hollow tube inserted into the cup through the first sealing cap;
the inner core is arranged in the hollow tube, the soaking part is an opening arranged on the lower side wall of the hollow tube, and the emitting part is an opening arranged on the upper side wall of the hollow tube.
Preferably, the emission device further comprises a second end cap for sealing the end of the hollow tube adjacent to the emission portion at the outside of the first end cap.
Preferably, the aforementioned standard vapor-dispensing device with controlled release rate, wherein the hollow tube is made of a corrosion-resistant material.
Preferably, the standard gas emitting device with controllable release rate is provided, wherein the inner core is a porous ceramic or sand core.
Preferably, the number of the standard gas emitting devices with controllable release rate is more than two.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. According to the test method provided by the invention, the method for testing the detection accuracy of the environmental chamber through the standard gas emission device with the controllable release rate comprises the following steps:
and (2) filling the volatile liquid into the body of the standard gas emission device with the controllable release rate, testing the concentration of the volatile substance in the gas of the environmental chamber after a specified time, calculating the mass difference of the standard gas emission device with the controllable release rate before and after the standard gas emission device is placed into the environmental chamber, and obtaining the recovery rate of the environmental chamber.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the test method comprises:
s100, testing the concentration of the volatile substances in the environment cabin, cleaning the environment cabin, and reducing the concentration of the volatile substances to a designated value;
s200, injecting a specified amount of volatile liquid into the body of the standard gas emission device with the controllable release rate, installing the inner core into the hollow tube, sealing the hollow tube through a second sealing end cap, sealing the closed container through the first sealing end cap, and inserting the emission device into the body so that the infiltration part of the hollow tube is completely immersed in the liquid;
s300, weighing the weight m of the standard gas emission device with the controllable release rate0；
S400, setting the temperature T, the humidity RH and the ventilation rate N of the environment cabin, and starting the environment cabin;
s500, placing the standard gas emission device with the controllable release rate into the environment cabin, pulling out the hollow pipe, and exposing the emission part outside the first sealing end cover under the state that the infiltration part is placed in the liquid;
s600, after time t, taking out the standard gas emission device with the controllable release rate, inserting the hollow pipe into the body, placing the emission part in the body, and weighing the weight m of the standard gas emission device with the controllable release rate1；
S700, detecting the concentration c of the volatile substances in the environmental chamber;
s800, calculating the recovery rate of the environmental chamber through a formula (1);
n＝(c×N×V×t)/Δm×100％…………(1)
wherein, Δ m ═ m0-m1。
Preferably, the aforementioned test method, wherein in step S100, comprises reducing the concentration of VOCs and SVOCs in the environmental chamber to 0-3 μ g/m by a high temperature cleaning method3The concentration of TVOC or TSVOC is reduced to 0-30 μ g/m3。
By the technical scheme, the release rate controllable standard gas emission device and the test method have the following advantages:
the standard gas emission device with the controllable release rate effectively evaluates the accuracy of the results of testing different pollutant release rates of different materials by the environmental chamber.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic illustration of a state of use of a controlled release rate standard vapor-dispensing device in accordance with an embodiment of the present invention;
FIG. 2 is a schematic illustration of a ready state of a controlled release rate standard vapor-dispensing device in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a plurality of devices of a standard vapor-dispensing device with controlled release rates, according to an embodiment of the present invention;
FIG. 4 is a flow chart of a test method as set forth in an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of the embodiments, structures, features and effects of the standard vapor-dispensing device with controllable release rate according to the present invention with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As shown in FIGS. 1 and 2, one embodiment of the present invention provides a controlled release rate standard vapor-dispensing device comprising a sealed container for holding a volatile liquid 6; the emission device is inserted into the closed container and comprises a soaking part and an emission part, the soaking part is soaked in the liquid 6, and the emission part is positioned outside the closed container; and the inner core 3 is arranged in the emission device and is used for controlling the volatilization speed of the volatile substances.
According to the standard gas emission device with the controllable release rate, disclosed by the invention, volatile liquid is injected into the closed container, and volatile substances enter the inner core through the infiltration part and are emitted to the outside of the standard gas emission device with the controllable release rate through the emission part. The standard gas emission device with the controllable release rate is placed in the environment cabin, the concentration of volatile substances emitted by the standard gas emission device with the controllable release rate in the environment cabin can be measured, the weight of the standard gas emission device with the controllable release rate before and after the test is poor, and the recovery rate of the environment cabin is detected. In order to accurately evaluate the recovery rate of the environmental chamber, the volatilization speed of the volatile substances needs to be controlled, so that the inner core is arranged in the emission device, and the control of the volatilization speed of the volatile substances is realized. Furthermore, the volatilization speed of the volatile substance is controlled by adjusting the contact area between the wetting part and the liquid and the area of the emission part exposed outside the closed container.
In conclusion, the standard gas emission device with the controllable release rate effectively evaluates the accuracy of the results of testing different pollutant release rates of different materials in the environmental chamber.
Further, preferably, the hermetic container includes a cup body 1 and a first hermetic cap 5 for sealing an opening of an end of the cup body 1.
In the preferred embodiment, the first sealing end cover and the cup body form the closed container, so that the structure is simple and the manufacturing cost is low.
Preferably, the cup body is made of stainless steel, glass or polytetrafluoroethylene and other materials with better corrosion resistance. The first end sealing cover can be made of rubber, and preferably made of a corrosion-resistant rubber material. The body and the first end cap of the closed container may also be made of glass, and the joint between the body and the first end cap may be frosted to avoid volatile matter from being emitted to the outside.
Further, preferably, the emission device comprises a hollow tube 2 inserted into the cup body 1 through the first sealing cover 5; the inner core 3 is arranged in the hollow tube 2, the soaking part is an opening arranged on the lower side wall of the hollow tube 2, and the emitting part is an opening arranged on the upper side wall of the hollow tube 2.
An opening is provided on each of the side walls of the lower and upper portions of the hollow tube to form the wetting section and the emitting section so that the lower portion of the core can be immersed in the liquid to absorb and desorb the volatile matter in the liquid, and emitted from the opening of the upper portion of the core to the outside of the closed vessel.
In this embodiment, it should be noted that when the emitting portion is completely exposed outside the first end cap, at least a portion of the wetting portion is immersed in the liquid to ensure that the wetting portion can absorb and resolve the volatile substances from the liquid.
Further, the emission device preferably further comprises a second end cap 4 for sealing the end of the hollow tube 2 adjacent to the emission portion at the outside of the first end cap 5.
The hollow tube is the tip opening that is close to the portion of giving off, and the tubulose of relative tip shutoff, when being full of the inner core in the hollow tube, the portion of giving off can no longer the lateral wall opening, regards the opening of tip as the portion of giving off. However, after the arrangement, the hollow pipe is difficult to fix in the cup body through the first sealing end cover, and is easy to slide down to the bottom of the cup body, and if the hollow pipe is a diffusion device made of glass materials, the device is easy to break. Therefore, it is preferable that the emission part is provided on the side wall of the hollow tube, and if the opening of the end part is not sealed, the volatile substance is emitted from both the opening of the end part and the emission part, which is not beneficial to the control of the emission speed, so that the opening of the end part of the hollow tube is sealed by the second end cap, and the second end cap plays a role of limiting the downward sliding of the hollow tube.
Further, preferably, the hollow tube 2 is made of a corrosion-resistant material.
Preferably, the hollow tube is made of a material having good corrosion resistance, such as stainless steel, glass, or polytetrafluoroethylene. On the basis of ensuring that the hollow tube is not corroded by liquid with acidity or alkalinity, because the materials have the performance that the liquid is not easy to permeate through, volatile substances in the liquid can only enter the hollow tube through the soaking part, and the emission speed of the volatile substances is effectively ensured.
Further, preferably, the inner core 3 is a porous ceramic or a sand core.
The material of the inner core needs to adopt the characteristic of absorbing and desorbing the volatile substances from the liquid, and among a plurality of materials, the inner core is preferably made of porous ceramics or sand cores, so that the absorption and desorption of the volatile substances are effectively realized.
Further, it is preferred that the number of the standard vapor-dispensing device with controlled release rate is two or more, as shown in FIG. 3.
In embodiments of the present invention, multiple controlled release rate standard vapor-dispensing devices may be used simultaneously. The sealed container of each standard gas emitting device with controllable release rate contains different liquids, so that the recovery rate of the environmental chamber after the multiple liquids are volatilized simultaneously can be tested. The same liquid can also be filled for increasing the speed of emission of the volatile substance. The dimensions of the containment vessel and/or hollow pipe of each monitoring device may be varied to allow testing at different emission rates during testing to obtain data on the recovery of the environmental chamber at different emission rates. In a word, set up the controllable standard gas of a plurality of release rate and distribute the device, conveniently carry on nimble various, satisfy the experiment of different requirements.
As shown in fig. 4, another embodiment of the present invention provides a testing method, including: and (2) filling the volatile liquid into the body of the standard gas emission device with the controllable release rate, testing the concentration of the volatile substance in the gas of the environmental chamber after a specified time, calculating the mass difference of the standard gas emission device with the controllable release rate before and after the standard gas emission device is placed into the environmental chamber, and obtaining the recovery rate of the environmental chamber.
By utilizing the release rate controllable standard gas emission device, the accuracy of the results of testing different pollutant release rates of different materials in the environmental chamber is effectively evaluated by the method.
The specific test method, as shown in the test method flowchart of fig. 4, includes:
s100, firstly, in order to ensure the accuracy of the test, testing the concentration of the volatile substances in the environment chamber, cleaning the environment chamber by a high-temperature cleaning method, and reducing the concentration of VOC and SVOC in the environment chamber to 0-3 [ mu ] g/m3Preferably 2. mu.g/m3The concentration of TVOC or TSVOC is reduced to 0-30. mu.g/m3Preferably 20. mu.g/m3The following;
s200, injecting a specified amount of volatile liquid into the body of the standard gas emission device with the controllable release rate, installing the inner core into the hollow tube, sealing the hollow tube through a second sealing end cap, sealing the closed container through the first sealing end cap, and inserting the emission device into the body so that the infiltration part of the hollow tube is completely immersed in the liquid;
s300, weighing the weight m of the standard gas emission device with the controllable release rate0；
S400, setting the temperature T, the humidity RH and the ventilation rate N of the environment cabin, and starting the environment cabin;
s500, placing the standard gas emission device with the controllable release rate into the environment cabin, pulling out the hollow pipe, and exposing the emission part outside the first sealing end cover under the state that the infiltration part is placed in the liquid;
s600, after time t, taking out the standard gas emission device with the controllable release rate, inserting the hollow pipe into the body, placing the emission part in the body, and weighing the weight m of the standard gas emission device with the controllable release rate1；
S700, detecting the concentration c of the volatile substances in the environmental chamber;
s800, calculating the recovery rate of the environmental chamber through a formula (1);
n＝(c×N×V×t)/Δm×100％…………(1)
wherein, Δ m ═ m0-m1。
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (9)
1. A controlled release rate standard vapor-dispensing device, comprising:
the closed container is used for containing volatile liquid;
the emission device is inserted into the closed container and comprises a soaking part and an emission part, the soaking part is soaked in the liquid, and the emission part is positioned outside the closed container;
the inner core is arranged in the emission device and is used for controlling the volatilization speed of the volatile substances;
the contact area of the infiltration part and the liquid and the area of the emission part exposed out of the closed container are adjusted to control the volatilization speed of the emission substance, the number of the emission devices is more than two, and the size of the closed container of each emission device is different.
2. A controlled release rate standard vapor-dispensing device according to claim 1,
the closed container includes a cup body and a first end cap for sealing an opening of an end of the cup body.
3. A controlled release rate standard vapor-dispensing device according to claim 2,
the dispensing device comprises a hollow tube inserted into the cup through the first seal cap;
the inner core is arranged in the hollow tube, the soaking part is an opening arranged on the lower side wall of the hollow tube, and the emitting part is an opening arranged on the upper side wall of the hollow tube.
4. A controlled release rate standard vapor-dispensing device according to claim 3,
the emanator device further includes a second end cap for sealing the end of the hollow tube proximate the emanator portion outside of the first end cap.
5. A controlled release rate standard vapor-dispensing device according to claim 3,
the hollow tube is made of a corrosion-resistant material.
6. A controlled release rate standard vapor-dispensing device according to claim 3,
the inner core is made of porous ceramic or sand core.
7. A method for testing the accuracy of environmental chamber testing by using the dispensing device according to any one of claims 1 to 6, wherein the number of the dispensing devices is two or more, and the size of the sealed container of each dispensing device is different, comprising:
will liquid with volatility is packed into in the device's of giving off body, through adjusting the area of contact of infiltration portion and liquid and the outside area of giving off portion exposure to the airtight container in order to control the volatilization speed of volatile substance, through appointed time, test in the environmental chamber gas the concentration of volatile substance, and calculate the device of giving off puts into the poor quality before and after the environmental chamber, obtain the rate of recovery in environmental chamber.
8. The test method according to claim 7,
the method comprises the following steps:
s100, testing the concentration of the volatile substances in the environment cabin, cleaning the environment cabin, and reducing the concentration of the volatile substances to a designated value;
s200, injecting a specified amount of volatile liquid into the body of the emission device, installing the inner core into a hollow tube, sealing the hollow tube through a second sealing end cover, sealing the closed container through a first sealing end cover, and inserting the emission device into the body so that the infiltration part of the hollow tube is completely immersed into the liquid;
s300, weighing the weight m of the emission device0；
S400, setting the temperature T, the humidity RH and the ventilation rate N of the environment cabin, and starting the environment cabin;
s500, placing the emission device into the environment cabin, pulling out the hollow pipe, and exposing the emission part out of the first sealing end cover under the state that the soaking part is placed in the liquid;
s600, after time t, taking out the emitting device, inserting the hollow pipe into the body, and enabling the emitting part to be arranged in the bodyWeighing the dispensing device by weight m1；
S700, detecting the concentration c of the volatile substances in the environmental chamber;
s800, calculating the recovery rate of the environmental chamber through a formula (1);
wherein, Δ m ═ m0-m1。
9. The test method according to claim 8,
in step S100, the method comprises reducing the concentration of VOC and SVOC in the environmental chamber to 0-3 μ g/m by high temperature cleaning3The concentration of TVOC or TSVOC is reduced to 0-30 μ g/m3。
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