CN213913194U - Gas diluting device for polluted gas purification test - Google Patents
Gas diluting device for polluted gas purification test Download PDFInfo
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- CN213913194U CN213913194U CN202022536520.8U CN202022536520U CN213913194U CN 213913194 U CN213913194 U CN 213913194U CN 202022536520 U CN202022536520 U CN 202022536520U CN 213913194 U CN213913194 U CN 213913194U
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Abstract
The utility model relates to a gaseous diluting device for contaminated gas purification test, it includes: a contaminated gas supply apparatus, a clean gas supply apparatus and a gas mixing apparatus; the polluted gas supply equipment is connected with the gas mixing equipment through a first pipeline, the clean gas supply equipment is connected with the gas mixing equipment through a second pipeline, the gas mixing equipment is connected with at least one diluent gas outlet pipeline, and a third valve and a flowmeter are sequentially arranged on each diluent gas outlet pipeline along the airflow direction; the gas mixing equipment is further connected with a diluent gas emptying pipeline, a first emptying valve is arranged on the diluent gas emptying pipeline, a diluent gas collecting pipeline is further arranged behind the first emptying valve, and a fourth valve is arranged on the diluent gas collecting pipeline. The utility model discloses a device can dilute into different concentration and flow with gaseous pollutants, and the degree of accuracy and the stability of its control are good.
Description
Technical Field
The utility model relates to a gaseous diluting device especially relates to a gaseous diluting device for contaminated gas purifies experiment.
Background
In recent years, under the advocation of various national air treatment policies and the stimulation of the wide market demands, various functional building material products such as aldehyde-cleaning coatings, diatom ooze ecological plates, aldehyde-cleaning gypsum boards and the like in the market of China are rapidly developed. The national evaluation of the purification performance of the building material products to the polluted gas is mainly evaluated by the 24-hour purification efficiency of the materials in the static sealed cabin to the polluted gas. In addition, JIS represented by japan and international ISO standards often simulate the actual use environment of products by a dynamic method for evaluating the air purification performance of functional materials, and for example, ISO 18560, ISO 16000-23, and ISO 22197 series standards simulate the actual use environment and provide a continuous dynamic polluted environment to evaluate the purification performance and purification capacity of building material products for polluted gases such as formaldehyde, acetaldehyde, and toluene. But different standards have different requirements on the concentration and flow rate of pollutants such as formaldehyde, toluene and the like. Similarly, in the research process of enterprises, public institutions, colleges and universities and the like, the purification performance of products and materials in polluted gas environments with different flow rates and concentrations is also required to be evaluated.
Various pollution gases in the current market are mainly steel cylinder standard gases prepared by a weighing method, but trace gases prepared by steel cylinders have large uncertainty and poor stability, and only high-concentration pollution gases can be provided. Before and after ninety years, gas distribution devices adopting a diffusion tube method have been developed at home and abroad, vapor is diffused along a uniform test tube by selecting proper diffusion cell combination, flow rate and temperature, diluent gas is mixed with component gas at a known flow rate through the other end of the test tube to prepare standard mixed gas, and different mixed gas contents can be obtained by changing the flow rate of the diluent gas. However, the stability is poor and the continuous generation is difficult, and the concentration of the gas generated by the diffusion tube is related to the flow rate, so that the purification test often needs to continuously prepare a large amount of diluent gas with different proportions, and the diffusion tube is difficult to simultaneously meet different requirements of the test on the concentration and the flow rate of the polluted gas.
The existing gas dilution device generally comprises a control module, a mass flow controller, an electromagnetic valve driving module, a power supply module, a communication module and a display module. The gas output by the two gas sources is decompressed by the pressure reducing valve and enters the mass flow controllers, the flow of the gas is controlled by each mass flow controller according to the concentration value set by the control module, and the concentration of the mixed gas generated after mixing is determined to be different according to the difference of the gas flow, so that the aim of preparing the target gas concentration is fulfilled. However, the device has high cost, is difficult to maintain and is difficult to popularize; the gas flow cannot be adjusted simultaneously when the gas with a certain concentration is diluted; the device is mainly suitable for diluting standard gas filled in a steel cylinder and is not suitable for polluting gas generated by a diffusion tube method.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a gaseous diluting device for contaminated gas purifies experimental, the technical problem that solve is that current gaseous diluting device can't adjust gas flow simultaneously when diluting the gas of certain concentration.
The purpose of the utility model and the technical problem thereof are realized by adopting the following technical scheme. The foundation the utility model provides a gaseous diluting device for contaminated gas purification test, it includes: a contaminated gas supply apparatus, a clean gas supply apparatus and a gas mixing apparatus;
the polluted gas supply equipment is connected with the gas mixing equipment through a first pipeline, the clean gas supply equipment is connected with the gas mixing equipment through a second pipeline, a first valve and a flowmeter are sequentially arranged on the first pipeline along the gas flow direction, and a second valve and a flowmeter are sequentially arranged on the second pipeline along the gas flow direction;
the gas mixing equipment is connected with at least one diluent gas outlet pipeline, and a third valve and a flowmeter are sequentially arranged on each diluent gas outlet pipeline along the gas flow direction;
the gas mixing equipment is further connected with a diluent gas emptying pipeline, a first emptying valve is arranged on the diluent gas emptying pipeline, a diluent gas collecting pipeline is further arranged behind the first emptying valve, and a fourth valve is arranged on the diluent gas collecting pipeline.
The purpose of the utility model and the technical problem thereof can be further realized by adopting the following technical measures.
Preferably, the gas dilution device for the polluted gas purification test is characterized in that the end of the diluted gas emptying pipeline is connected with a buffer tank or a diluted gas absorption pipe.
Preferably, the gas dilution device for a contaminated gas purification test is described above, wherein the contaminated gas supply apparatus is a standard contaminated gas cylinder.
Preferably, the gas dilution device for a contaminated gas purification test is described above, wherein the contaminated gas supply apparatus is a diffusion tube type gas generator.
Preferably, in the gas dilution device for the contaminated gas purification test, a contaminated gas evacuation pipeline is further disposed on the first pipeline, and a second evacuation valve and a flow meter are disposed on the contaminated gas evacuation pipeline before the first valve.
Preferably, the gas dilution device for the polluted gas purification test is characterized in that the tail end of the polluted gas emptying pipeline is connected with a buffer tank or a polluted gas absorption pipe.
Preferably, the gas dilution device for the contaminated gas purification test described above, wherein all the flow meters are disposed after the corresponding valves in the gas flow direction.
Preferably, in the gas dilution device for the contaminated gas purification test, the clean gas supply device is an air compressor or a high-purity nitrogen gas cylinder.
Preferably, the gas dilution device for the polluted gas purification test is described in the foregoing, wherein the gas mixing device is a stainless steel mixing tank or a glass container.
Preferably, the gas dilution device for the contaminated gas purification test is described above, wherein the flow meter is a mass flow meter or a rotameter.
Borrow by above-mentioned technical scheme, the utility model provides a gaseous diluting device for contaminated gas purifies experiment has following advantage at least:
1. the device provided by the utility model comprises a polluted gas supply device, a clean gas supply device and a gas mixing device, wherein the polluted gas supply device and the clean gas supply device can adjust the flow relation of the polluted gas and the clean gas as required through a pipeline and the gas mixing device respectively so as to obtain the required diluent gas with different concentrations; simultaneously the gas mixing equipment is connected with at least one diluent gas outlet pipeline, and the flow through controlling each diluent gas outlet pipeline can be adjusted as required respectively for the simultaneous test of 1 or more experimental samples, simultaneously the gas mixing equipment is also connected with a diluent gas evacuation pipeline, and can be used for evacuating redundant diluent gas during the real-time monitoring and analysis of the concentration of the diluent gas. The device reduces the standard gas reserves of a laboratory and saves the cost.
2. The utility model discloses a device can dilute the gaseous of the required different concentrations of experiment and flow with the gaseous of polluted gas of high concentration, and the degree of accuracy and the stability of its control are good for polluted gas purification performance such as formaldehyde, toluene of test material or product under the developments air feed environment.
3. The utility model discloses a device is through setting up at least one diluent gas evacuation pipeline, through valve adjustment, obtains the diluent gas of different flows, sets up diluent gas evacuation pipeline simultaneously, real-time supervision and analysis diluent gas's concentration to with unnecessary diluent gas evacuation.
4. The utility model discloses a device realizes taking place the dilution of pollution gas to diffusion tube gas generator through further setting up the gaseous evacuation pipeline of pollution.
5. The utility model discloses a device can also obtain the diluent gas of different humidity through the humidity of control clean air when realizing adjusting contaminated gas's flow and concentration.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a gas dilution device for a pollution gas purification test according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a gas dilution device for a pollution gas purification test according to another embodiment of the present invention;
FIG. 3 shows a graph of the outlet formaldehyde concentration over time for example 1.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the objects of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of the present invention with reference to the detailed description of the embodiments, structures, features and effects of the gas dilution device for pollution gas purification test provided by the present invention. 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 fig. 1 and fig. 2, an embodiment of the present invention provides a gas dilution device for a contaminated gas purification test, including: a gaseous mixture equipment 3 for providing the gaseous pollution supply apparatus 1 of gaseous pollution source, a clean gas supply apparatus 2 for providing the clean air source and being used for mixing gaseous pollution and clean gas, gaseous pollution supply apparatus 1 through first pipeline 11 with gaseous mixture equipment 3 is connected, gaseous clean supply apparatus 2 through second pipeline 12 with gaseous mixture equipment 3 is connected, set gradually first valve 111 and flowmeter 112 along the air current direction on the first pipeline 11, set gradually second valve 121 and flowmeter 122 along the air current direction on the second pipeline 12 in proper order, gaseous mixture equipment 3 is connected with at least one diluent gas outlet pipeline 13, sets gradually third valve 131 and flowmeter 132 along the air current direction on every diluent gas outlet pipeline 13, gaseous mixture equipment 3 still is connected with diluent gas evacuation pipeline 14, the diluent gas emptying pipeline 14 is provided with a first emptying valve 141, a diluent gas collecting pipeline 15 is further arranged behind the first emptying valve 141, and the diluent gas collecting pipeline 15 is provided with a fourth valve 151. Since the concentration of the polluted gas in the diluent gas evacuation line is not high and the amount of the polluted gas discharged is small, the diluent gas in the diluent gas evacuation line can be directly discharged into the atmosphere. But when the emission concentration of the polluted gas in the dilution gas evacuation pipeline does not meet the emission standard regulated by the state, or the emission of the polluted gas is avoided. Preferably, a buffer tank or a diluent gas absorption pipe is further connected to a terminal of the diluent gas exhaust line 14. Set up buffer tank or polluted gas absorption tube and can prevent that polluted gas from discharging and causing the atmosphere pollution, wherein set up the polluted gas that the buffer tank can save among the polluted gas evacuation pipeline, avoid discharging the polluted gas in the atmosphere, if needs, can also carry out the secondary and use.
In some embodiments, as shown in fig. 1, a diluted gas outlet line 13 is connected to the gas mixing apparatus 3, and a third valve 131 and a flow meter 132 are sequentially disposed on the diluted gas outlet line 13 along the gas flow direction.
In other embodiments, a plurality of diluent gas outlet pipes 13 are connected to the gas mixing device 3, and a third valve 131 and a flow meter 132 are sequentially arranged on each diluent gas outlet pipe 13 along the gas flow direction, as shown in fig. 2, 4 diluent gas outlet pipes 13 are connected to the gas mixing device 3, and each diluent gas outlet pipe is provided with a corresponding valve 131 and a corresponding flow meter 132.
The utility model discloses do not do specific injecing to valve and flowmeter on diluent gas outlet pipeline and the pipeline, they can be the same or different, and confirm the quantity of diluent gas outlet pipeline as required, the diluent gas that comes out of every diluent gas outlet pipeline can be the same or different, the diluent gas flow of these diluent gas outlet pipelines is adjusted and is controlled through corresponding third valve, in order to obtain the diluent gas of different flows, satisfy different test equipment's requirement through adjusting the flow on every pipeline.
It should be noted that, in order to avoid the influence on the diluent gas exhaust line 14 when the fourth valve 151 is opened by monitoring the collected gas, the diluent gas collection line 15 should be disposed after the first vent valve 141, so that when the fourth valve 151 is opened to collect the diluent gas in the diluent gas exhaust line 14, the influence on the diluent gas exhaust line 14 is avoided, and the stability of the system is ensured.
It should be noted that in the present embodiment, all the flow meters are disposed behind the corresponding valves in the gas flow direction to measure the flow rate after the valve adjustment and control, such as the flow meter 112 disposed behind the first valve 111, the flow meter 122 disposed behind the second valve 121, the flow meter 132 disposed behind the third valve 131, and the flow meter 162 disposed behind the second vent valve 161.
The present embodiment does not specifically limit the type of the flow meter, as long as the requirement for measuring the flow rate can be satisfied. All the flow meters for measuring the gas flow rate after the corresponding valve adjustment, such as the flow meter 112, the flow meter 122, the flow meter 132, the flow meter 162, etc., can be the same flow meter, or different flow meters can be selected according to the requirement. In some embodiments, the flow meter is a mass flow meter or a rotameter.
The present embodiment does not specifically limit the type of the valve, as long as the requirement of flow control can be satisfied. All the valves of the present embodiment are used for controlling the flow of the gas, such as the first valve 111, the second valve 121, the third valve 131, the fourth valve 151, the first emptying valve 141, the second emptying valve 161, and the like, and the same type of valve, such as a ball valve or a needle valve, may be selected, or different types of valves may be selected according to the requirement. In general, when the gas flow on the pipeline is small, a needle valve is selected in order to ensure the precision control of the flow; when the gas flow rate on the pipeline is large, a cheaper ball valve can be selected from the cost consideration.
In some preferred embodiments, the valves may be selected from ball valves or needle valves.
The utility model discloses in, clean gas supply apparatus is used for providing clean air source, can be high-purity nitrogen gas, also can be for the compressed air after the purification.
In some embodiments, the clean gas supply device is an air compressor with a purification device or a standard nitrogen cylinder.
The utility model discloses in, gas mixing equipment is used for mixing gaseous pollutants and clean gas, and stainless steel or glass are preferred to its material. The utility model discloses do not do specific injecing to gas mixing equipment, mainly provide the airtight space that has certain volume, and the material of this equipment does not react with gaseous pollutants, also can not produce corruption etc..
In some embodiments, the gas mixing apparatus is a stainless steel mixing tank or a glass vessel stainless steel gas mixing tank.
The utility model discloses in, gaseous pollutants supply apparatus is used for providing the gaseous pollutants and takes place the source, can provide standard gaseous pollutants for the steel bottle, also can be for the equipment that takes place gaseous pollutants through other modes, like gas generator. The contaminated gas supply apparatus supplies the contaminated gas generating source with a higher concentration of the contaminated gas than the required concentration of the diluent gas.
In some embodiments, the contaminated gas supply apparatus is a standard contaminated gas cylinder.
In other embodiments, the contaminated gas supply apparatus is a diffusion tube gas generator.
Further, when the contaminated gas supply apparatus is a diffusion tube type gas generator, a contaminated gas evacuation line 16 is further provided on the first pipe 11, and a second evacuation valve 161 and a flow meter 162 are provided on the contaminated gas evacuation line 16 before the first valve 111.
In this embodiment, the contaminated gas evacuation line is used to evacuate excess contaminated gas. Because the concentration of the required polluted gas is not high during the test and the discharge amount is small, most of the polluted gas in the polluted gas emptying pipeline can be directly discharged into the atmosphere. But when the emission concentration of the polluted gas in the dilution gas evacuation pipeline does not meet the emission standard regulated by the state, or the emission of the polluted gas is avoided. Preferably, a buffer tank or a contaminated gas absorption tube is further connected to a terminal of the contaminated gas evacuation line 16 to prevent the contaminated gas from being discharged to cause air pollution, wherein the buffer tank is configured to store the contaminated gas in the contaminated gas evacuation line for secondary use.
The utility model discloses an in the device, gaseous pollutants in the gaseous pollutants supply apparatus gets into gas mixing equipment through first pipeline, gaseous pollutants in the gaseous pollutants supply apparatus gets into gas mixing equipment through the second pipeline, can adjust gaseous pollutants and gaseous clean flow relation as required, with the gaseous mixture that obtains required different concentrations, gaseous pollutants mixture mixes with gaseous clean in gas mixing equipment, reach the mesh of diluting gaseous pollutants, the diluent gas after the mixture is connected with the test equipment that needs this concentration and diluent gas through releasing gas outlet pipeline, diluent gas outlet pipeline can be for 1 way or multichannel, satisfy different test equipment's requirement through the flow of adjusting on every pipeline.
The device can conveniently obtain the diluent gas with different concentrations by adjusting the flow relation of the polluted gas and the clean gas, and can also conveniently obtain the diluent gas with different flows by adjusting the flow of each first diluent gas outlet pipeline.
The utility model discloses a device is through setting up at least one diluent gas evacuation pipeline, through valve adjustment, obtains the diluent gas of different flow, sets up diluent gas evacuation pipeline simultaneously, with unnecessary diluent gas evacuation to set up diluent gas collection pipeline on diluent gas evacuation pipeline, be arranged in the diluent gas of gathering in real time in the gas mixing equipment, with the concentration of real-time supervision and analysis diluent gas, guarantee the required diluent gas's of test equipment accuracy.
The utility model discloses a device realizes taking place the dilution of pollution gas to diffusion tube gas generator through further setting up the gaseous evacuation pipeline of pollution.
The device provided by the utility model can adjust gaseous pollutants's flow and concentration simultaneously. The device can dilute high-concentration polluted gas into gas with different concentrations and flow rates required by tests, and is used for testing the purification performance of polluted gas such as formaldehyde, methylbenzene and the like of materials or products in a dynamic gas supply environment. The device can reduce the standard gas reserve of laboratory, practices thrift the cost.
The utility model relates to a device can connect a plurality of outgas outlet pipeline, and the gas flow of each pipeline can be adjusted as required respectively through the valve to the gas that provides the different flow of multichannel, be used for a plurality of experimental samples of concurrent test. And further controlling the humidity of the clean air to obtain the diluent gas with different humidity.
The steel cylinder standard gas prepared by professional manufacturers at present has high cost, is not economical and causes great waste. Meanwhile, the standard gas concentration prepared by the diffusion tube method is greatly influenced by the flow, and the concentration and the flow are difficult to control and meet the conditions at the same time. The utility model discloses can dilute the contaminated air supply or the steel bottle gas of high concentration into flow and concentration adjustable multichannel gas, overcome the shortcoming that present contaminated air supply can't adjust flow and concentration simultaneously, can be used for a plurality of experimental tests simultaneously.
The present invention will be further described with reference to the following specific embodiments, which are not to be construed as limiting the scope of the present invention, and the modifications and adjustments made by those skilled in the art according to the above disclosure are not essential to the present invention.
Preparation of the experiment: concentration (C) of a contaminated gas generating source (cylinder or diffusion tube) required for the test1) Testing and determining the actual required flow (Q) of the contaminated gas2) And concentration (C)2)。
The concentration and the flow rate of each path of gas accord with the following formula (1):
in the formula (1), the reaction mixture is,
Q1is the flow of the contaminated gas entering the mixer;
Q3is the flow of clean air into the mixer.
Formula (2) is obtained from formula (1) as follows:
example 1
Use the utility model discloses a gas dilution device is used for the polluted gas purification test, and it includes following step:
in the first step, a certain formaldehyde gas generator (diffusion tube generator) 1 is used as a generating source of the polluted gas, and tests show that the generator 1 can generate the polluted gas with the concentration of 1000 mu g/m3(C1) High-concentration formaldehyde gas with the flow rate of 0.5L/min; according to the test requirement of ISO 16000-23, the concentration of 100 +/-10 mu g/m needs to be introduced into the sample chamber3(C2) A diluent gas with a flow rate of 1.0 plus or minus 0.1L/min and a humidity of 50 plus or minus 5% RH;
secondly, selecting the flow of the polluted gas entering the mixing tank body 3 to be 0.3L/min (Q)1) By calculation, the cleanliness of the tank 3 can be determinedFlow rate Q of gas32.7L/min, the humidity of the clean air is 55% RH, and the other 0.2L/min of the polluted gas needs to be evacuated through a polluted gas evacuation pipeline 16; according to the calculation result, the first valve 111, the second valve 121 and the second emptying valve 161 are opened simultaneously, after the mixing tank is fully inflated, the third valve 131 and the first emptying valve 141 are opened simultaneously, the flow of the diluent gas in the diluent gas outlet gas circuit 13 is enabled to be 1.0L/min, the redundant diluent gas is emptied through the diluent gas emptying pipeline 14, the diluent gas exhausted from the diluent gas emptying pipeline 14 is sampled through the fourth valve 151 arranged on the diluent gas collecting pipeline 15, and the concentration of the formaldehyde gas at the outlet is continuously tested through DNPH-high performance liquid chromatography.
The test results show that the change data of the outlet formaldehyde concentration with time are shown in table 1, and a change chart of the outlet formaldehyde concentration with time is given, as shown in fig. 3.
TABLE 1 Formaldehyde concentration as a function of time
| Time (d) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| C2(μg/m3) | 103 | 109 | 105 | 110 | 104 | 98 | 106 | 102 |
| Q(L/min) | 1.03 | 1.02 | 1.01 | 1.00 | 1.02 | 1.05 | 0.99 | 0.99 |
| Humidity% RH | 49.7 | 48.4 | 49.2 | 51.5 | 53.5 | 52.8 | 51.0 | 52.6 |
As can be seen from the above table 1 and FIG. 3, the gas dilution device can continuously and stably dilute the formaldehyde generating gas source to 100 + -10 μ g/m3(C2) And controlling the flow rate of the test gas to be 1.0 +/-0.1L/min and the humidity to be 50 +/-5% RH.
When the concentration of the diluent gas to be introduced into the sample chamber is not changed and the flow rate is changed to 0.8L/min, the flow rate of the diluent gas outlet gas path is 0.8L/min by adjusting the valve 131 of the diluent gas outlet gas path and the valve 141 of the diluent gas evacuation pipeline, and the redundant diluent gas is evacuated through the diluent gas evacuation pipeline, so that the diluent gas with different flow rates can be obtained.
When the concentration of the diluent gas which needs to be introduced into the sample chamber is 200 mug/m3(C2) When the flow rate is 1.0L/min, the flow rate Q of the clean gas entering the mixing tank 3 can be obtained by calculation3And when the concentration of the diluted formaldehyde gas is 1.2L/min, closing the first valve 111 and the second valve 121, adjusting the second emptying valve 161, emptying all the polluted gas generated in the generator, then opening the first emptying valve 141, emptying the diluted gas in the sample cabin, then simultaneously opening the first valve 111 and the second valve 121 as required, adjusting the second emptying valve 161, after the mixing tank is fully inflated, simultaneously opening the third valve 131 and the first emptying valve 141 to enable the flow of the diluted gas in the diluted gas outlet gas circuit 13 to be 1.0L/min, emptying redundant diluted gas through the diluted gas emptying pipeline 14, and sampling and detecting the concentration of the diluted formaldehyde gas through a fourth valve 151 arranged on the diluted gas collecting pipeline 15 of the diluted gas exhausted from the diluted gas emptying pipeline 14.
Example 2
Use the utility model discloses a gas dilution device is used for the polluted gas purification test, and it includes following step:
firstly, using steel cylinder armored benzene standard gas (the concentration is 100ppm) as a generating source of polluted gas; the test requires that 5ppm (C) of concentration is fed into the sample chamber and the comparison chamber simultaneously2) Toluene gas with a flow rate of 0.5 +/-0.1L/min;
secondly, opening the pressure reducing valve on the steel cylinder gas, and adjusting the flow of the toluene entering the mixing tank body to be 0.2L/min (Q)1) By calculation, Q can be obtained3The flow rate is 3.8L/min, a valve of a clean gas inlet gas path is opened, and the flow meter is adjusted to 3.8L/min according to the calculation result;
and thirdly, opening valves and flow meters of two paths of diluent gas outlet gas paths, setting the flow rate to be 0.5L/min, emptying redundant diluent gas, and respectively connecting the sample chamber and the comparison chamber for testing. The concentration of the outlet toluene is 5 +/-0.1 ppm through a gas chromatography FID test, and the test requirement is met.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be appreciated that the relevant features of the devices described above may be referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (10)
1. A gas dilution device for a contaminated gas purification test, comprising: a contaminated gas supply apparatus, a clean gas supply apparatus and a gas mixing apparatus;
the polluted gas supply equipment is connected with the gas mixing equipment through a first pipeline, the clean gas supply equipment is connected with the gas mixing equipment through a second pipeline, a first valve and a flowmeter are sequentially arranged on the first pipeline along the gas flow direction, and a second valve and a flowmeter are sequentially arranged on the second pipeline along the gas flow direction;
the gas mixing equipment is connected with at least one diluent gas outlet pipeline, and a third valve and a flowmeter are sequentially arranged on each diluent gas outlet pipeline along the gas flow direction; the gas mixing equipment is further connected with a diluent gas emptying pipeline, a first emptying valve is arranged on the diluent gas emptying pipeline, a diluent gas collecting pipeline is further arranged behind the first emptying valve, and a fourth valve is arranged on the diluent gas collecting pipeline.
2. The gas dilution device for a contaminated gas purification test according to claim 1, wherein a buffer tank or a diluted gas absorption pipe is connected to an end of the diluted gas evacuation line.
3. The gas dilution apparatus for contaminated gas purification test according to claim 1, wherein the contaminated gas supply device is a standard contaminated gas cylinder.
4. The gas dilution apparatus for a contaminated gas purification test according to claim 1, wherein the contaminated gas supply device is a diffusion tube type gas generator.
5. The gas dilution device for the polluted gas purification test according to claim 4, wherein a polluted gas evacuation pipeline is further arranged on the first pipeline, and a second evacuation valve and a flow meter are arranged on the polluted gas evacuation pipeline and located in front of the first valve.
6. The gas dilution device for contaminated gas purification test according to claim 5, wherein a buffer tank or a contaminated gas absorption pipe is connected to a terminal end of the contaminated gas evacuation line.
7. The gas dilution apparatus for a contaminated gas purge test according to claim 1, wherein all of the flow meters are disposed after the corresponding valves in the gas flow direction.
8. The gas dilution apparatus for contaminated gas purification test according to claim 1, wherein the clean gas supply device is an air compressor or a cylinder of high purity nitrogen gas.
9. The gas dilution apparatus for a contaminated gas purging test according to claim 1, wherein the gas mixing device is a stainless steel mixing tank or a glass container.
10. The gas dilution apparatus for a contaminated gas purification test according to claim 1, wherein the flow meter is a mass flow meter or a rotameter.
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| CN202022536520.8U CN213913194U (en) | 2020-11-05 | 2020-11-05 | Gas diluting device for polluted gas purification test |
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