KR20230006302A - Sampling system for gaseous air pollutants in atmosphere and method for cleaning The same - Google Patents

Abstract

The present invention relates to a sample air collection apparatus capable of effectively removing a particulate substance included in sample air as well as stably collecting the sample air for a predetermined time, and a cleaning method of the sample air collection apparatus, capable of effectively cleaning various components constituting the sample air collection apparatus. In accordance with the present invention, the sample air collection apparatus includes: a filter unit filtering a particulate substance included in sample air introduced by the operation of a sample air collection pump; a sample air collection pump applying a suction force to suction the sample air, and discharging the suctioned sample air to a sample air pipe; a release valve provided on the sample air pipe to maintain pressure of the sample air discharged from the sample air collection pump at a predetermined level of pressure; a pressure control valve provided on the sample air pipe at the rear end of the release valve to control the pressure of the sample air; and a canister collecting the sample air having passed sequentially through the release valve and the pressure control valve of the sample air pipe. In a state in which the pressure of the sample air passing through the release valve is maintained by the release valve at the predetermined level of pressure, the pressure of the sample air passing through the pressure control valve is controlled through the pressure control valve such that a collection time of the sample air collected into the canister can be controlled.

Description

Sample air collecting device and method for cleaning the sample air collecting device {Sampling system for gaseous air pollutants in atmosphere and method for cleaning The same}

The present invention relates to a sample air collecting device and a cleaning method of the sample air collecting device, and more particularly, to a sample air capable of stably collecting sample air for a certain period of time while effectively removing particulate matter contained in the sample air. The present invention relates to a cleaning method of a sample air collecting device capable of effectively cleaning the collecting device and various components constituting the sample air collecting device.

Gaseous substances that cause air pollution include nitrogen oxides (NO _x ), sulfur oxides (SO _x ), carbon monoxide (CO), ozone (O ₃ ), and volatile organic compounds (VOCs). Since these gaseous substances are generated from various indoor and outdoor pollutants and directly affect the human body and the atmospheric environment, accurate analysis of them is required.

In general, sample air containing gaseous substances is collected, and analysis of gaseous substances is performed on the collected sample air. In addition to gaseous substances, particulate substances such as PM2.5, PM10, TSP and the like may be included. If the collected sample air contains particulate matter, the components of the sample air can be changed, such as deposition of gaseous material on the particulate material or decomposition of the particulate material and conversion into gaseous material. In addition, when such particulate matter is included in the sample air, it may cause clogging of the capillary tube of the analysis device and a decrease in sensor sensitivity of the analysis device. In addition, since the particulate matter contained in the air is analyzed through a separate analysis method, it is necessary to filter out the particulate matter from the sample air when analyzing the gaseous material.

On the other hand, when sample air is collected for gaseous material analysis, it must be possible to stably collect sample air at a constant flow rate for a long time in addition to short-time collection for reliability of analysis of the sample air.

A canister is widely used to collect sample air containing gaseous substances. In the conventional case, a pump is connected to the canister and a device having a filter on one side of the canister is used for sample air collection. Therefore, it is not possible to stably collect the sample air at a constant flow rate for a long time, and there is a limit to separating particulate matter in the sample air. In addition, when the canister is reused, the sample air remaining in the canister must be completely exhausted, but it is not possible to exhaust the remaining sample air with conventional devices.

Korean Registered Patent No. 2208042 (2021. 1. 28. Announcement)

The present invention has been made to solve the above problems, and an object of the present invention is to provide a sample air collecting device that can stably collect sample air for a certain period of time while effectively removing particulate matter contained in sample air. there is.

Another object of the present invention is to provide a cleaning method of a sample air collecting device capable of effectively cleaning all components, such as a canister and a valve, constituting the sample air collecting device.

In order to achieve the above objects, a sample air collecting device according to the present invention includes a filter device for filtering particulate matter included in the sample air from the sample air introduced by the operation of the sample air collecting pump; a sample air collecting pump for sucking sample air by applying a suction force and discharging the sucked sample air to a sample air pipe; a release valve provided on the sample air pipe to maintain the pressure of the sample air discharged from the sample air collecting pump at a constant pressure; a pressure control valve provided on the sample air pipe at the rear end of the release valve to adjust the pressure of the sample air; And a canister for collecting the sample air that has sequentially passed through the release valve and the pressure control valve of the sample air pipe, in a state where the pressure of the sample air passing through the release valve is maintained at a constant pressure by the release valve , It is characterized in that the collection time of the sample air collected in the canister can be controlled by adjusting the pressure of the sample air passing through the pressure control valve through the pressure control valve.

The filter device includes an upper connection pipe, a lower connection pipe, a filter holder, a filter, and a coupling member, and the upper connection pipe and the lower connection pipe are combined to provide a space in which the filter holder is mounted and a space in which sample air is introduced. One end of the upper connection pipe is connected to the first stage of the sample air collecting pump to deliver the suction force of the sample air collecting pump, and one end of the lower connecting pipe is connected to the sample air inlet and the suction force of the first stage of the sample air collecting pump The silver is delivered to the sample air inlet through the upper and lower connectors, and a filter holder is installed in the inner space where the upper and lower connectors are joined, and the filter holder is equipped with a filter for filtering particulate matter. The coupling member is mounted on an outer surface of a portion where the upper connector tube and the lower connector tube are coupled in a state in which the upper connector tube and the lower connector tube are coupled to reinforce the coupled state of the upper connector tube and the lower connector tube.

The upper connector pipe is made of a polymer material, and the lower connector pipe is made of a metal material. When the upper connector pipe and the lower connector pipe are coupled, the flexibility of the upper connector pipe results in a sealed state between the upper connector pipe and the lower connector pipe. is strengthened

A first pressure gauge provided at the rear end of the release valve to measure the pressure of the sample air passing through the release valve, and a second pressure gauge provided at the rear end of the pressure control valve to measure the pressure of the sample air passing through the pressure control valve more includes

The sample air collecting pump has a first stage and a second stage, the first stage of the sample air collecting pump is connected to the upper connection pipe of the filter device, and the second stage of the sample air collecting pump is connected to the sample air pipe, The sample air collecting pump sucks sample air through a first stage and discharges the sucked sample air to a sample air pipe through a second stage.

In the process of being collected in the canister through the release valve and the pressure regulating valve, as the canister is filled with sample air, the pressure of the sample air passing through the pressure regulating valve becomes close to the pressure of the sample air passing through the release valve. When it is completely filled, the pressure of the release valve and the pressure of the pressure control valve become the same.

A cyclone may be further provided at a lower portion of the filter device, and relatively heavy solids included in the sample air fall by gravity into the cyclone.

In order to achieve the above object, a cleaning method of a sample air collecting device according to the present invention applies a suction force to the first stage of the sample air collecting pump to suck in the remaining sample air present in the canister and the sample air pipe, thereby sucking the sample air collecting pump. discharging through a second end of the; injecting the cleaning gas into the sample air pipe and the canister by discharging the cleaning gas through the first stage of the sample air collecting pump; and applying a suction force to the first stage of the sample air collecting pump to suck the cleaning gas injected into the canister and the sample air pipe, and discharging the sucked cleaning gas through the second stage of the sample air collecting pump. characterized by being made.

The cleaning gas is an inert gas or air.

The sample air collecting device and the cleaning method of the sample air collecting device according to the present invention have the following effects.

When sample air is collected for analyzing gaseous substances, particulate matter can be effectively separated from the sample air. In addition, since it is possible to selectively control the collection time of sample air collected in the canister, sample air can be sampled in various time ranges. In addition, since the sample air collecting device including the canister can be cleaned, analysis reliability degradation due to residual sample air can be prevented.

1 is a block diagram of a sample air collecting device according to an embodiment of the present invention.
2a and 2b are configuration diagrams of a filter device according to an embodiment of the present invention.
3 is a flowchart illustrating a cleaning method of a sample air collecting device according to an embodiment of the present invention.
Figure 4a is a reference diagram for explaining the discharge process of the remaining sample air.
Figure 4b is a reference diagram for explaining the injection process of the cleaning gas.
Figure 4c is a reference diagram for explaining the process of discharging the cleaning gas.
5 is a photograph of a sample air collecting device actually manufactured according to an embodiment of the present invention.
6a and 6b are photographs of actually manufacturing a filter device according to an embodiment of the present invention.

The present invention proposes a technique for collecting sample air that can increase the reliability of gaseous material analysis by filtering out particulate matter contained in sample air when sampling air for gaseous pollutant analysis. In addition, the present invention implements various sampling of the sample air by enabling sample air to be sampled at a constant flow rate within a variety of time ranges, and also proposes a technology capable of cleaning the sample air collecting device.

As mentioned above in the 'Technology Background of the Invention', the conventional sample air collecting device using a canister is in the form of simply connecting a pump to the canister, thereby adjusting the collection time of the sample air or cleaning process for the remaining sample air. Progress is not possible In addition, a filter is provided for separation of particulate matter, but there is great room for improvement.

The present invention can separate particulate matter through an optimal mechanical configuration, control the collection time range of sample air through pressure control, and effectively clean the sample air collecting device through pump control. present a skill

Hereinafter, a sample air collecting device and a cleaning method of the sample air collecting device according to an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the sample air collecting device according to an embodiment of the present invention includes a filter device 110, a sample air collecting pump 120, a release valve 140, a first pressure gauge 141, and a pressure control valve. 150, a second pressure gauge 151 and a canister 160.

The sample air is introduced through the sample air inlet 10 provided on one side of the filter device 110 by the operation of the sample air collecting pump 120, and passes through the release valve 140 and the pressure control valve 150 to the canister 160. ) is captured in A sample air pipe 130 through which sample air is transported is provided between the sample air collection pump 120 and the canister 160, and a release valve 140 and a first pressure gauge 141 are provided along the sample air pipe 130. , a pressure control valve 150, and a second pressure gauge 151 are sequentially provided. That is, the sample air introduced through the sample air inlet 10 by the operation of the sample air collecting pump 120 passes through the filter device 110 and is supplied to the sample air pipe 130, and the sample air pipe 130 It is collected and stored in the canister 160 through the release valve 140 and the pressure control valve 150 provided along the way.

The first pressure gauge 141 is provided at the rear end of the release valve 140 to indicate the pressure of the sample air passing through the release valve 140, and the second pressure gauge 151 is provided at the rear end of the pressure control valve 150. It is provided and indicates the pressure of the sample air passing through the pressure control valve 150. The collection time of the sample air collected in the canister 160 can be controlled through the pressure difference between the sample air pressure passing through the release valve 140 and the sample air pressure passing through the pressure control valve 150, which will be described later. I'm going to do it.

The filter device 110 is a device for filtering particulate matter and other solid foreign substances contained in the sample air, and the filter device 110 applies the suction force of the sample air collecting pump 120 to the sample air inlet 10 ) side so that the sample air can be sucked through the sample air inlet 10. That is, the filter device 110 sucks the sample air through the suction force of the sample air collecting pump 120 and serves to filter out particulate matter and foreign substances included in the sucked sample air.

For suction of sample air and filtering of particulate matter, the filter device 110 includes an upper connection pipe 111, a lower connection pipe 112, and a filter holder 113 as shown in FIGS. 2A and 2B in detail. ), a filter and a coupling member 114. The upper connection pipe 111 and the lower connection pipe 112 are coupled to provide a space in which the filter holder 113 is mounted and a space into which sample air is introduced. One end of the upper connection pipe 111 is connected to the sample air collecting pump 120 to transmit the suction force of the sample air collecting pump 120, and one end of the lower connection pipe 112 is connected to the sample air inlet 10. . Accordingly, the suction force of the sample air collection pump 120 is transmitted to the sample air inlet 10 via the upper connection pipe 111 and the lower connection pipe 112 .

In addition, a filter holder 113 is mounted in the inner space where the upper connection pipe 111 and the lower connection pipe 112 are coupled, and a filter (not shown) is provided in the filter holder 113. The filter holder 113 may be configured in the form of a mesh network having a space in which a filter is mounted.

The coupling member 114 is mounted on the outer surface of the portion where the upper connection tube 111 and the lower connection tube 112 are coupled in a state where the upper connection tube 111 and the lower connection tube 112 are coupled to form an upper connection It serves to strengthen the coupling state of the pipe 111 and the lower connection pipe 112. Threads are provided on the outer surfaces of the upper connector 111 and the lower connector 112 so that they can be screwed into the coupling member 114 .

The sample air collection pump 120 passes through the upper connection pipe 111 and the lower connection pipe 112 introduced through the sample air inlet 10 in the state in which the upper connection pipe 111 and the lower connection pipe 112 are coupled. As it moves to , sealing of the joint between the upper connector 111 and the lower connector 112 is very important. To this end, in the present invention, the lower connector 112 and the coupling member 114 are made of a metal material, for example, SUS, and the upper connector 111 is made of Teflon as an embodiment of a polymer material. As the upper connector 111 is made of a polymer material and the lower connector 112 is made of a metal material, when the upper connector 111 and the lower connector 112 are combined, the flexibility of the upper connector 111 The sealing between the upper connection pipe 111 and the lower connection pipe 112 is strengthened due to the structure.

Under this structure, the sample air introduced through the sample air inlet 10 by the operation of the sample air collecting pump 120 passes through the space in the upper connection pipe 111 and the lower connection pipe 112, and then the sample air collecting pump It moves to the first stage 121 of 120, and in this process, particulate matter and foreign matter included in the sample air are filtered by a filter. The sample air that has passed through the filter device 110, that is, the sample air from which particulate matter has been filtered, is passed through a release valve 140, a first pressure gauge 141, a pressure control valve 150, and a second pressure gauge 151. It flows into the provided sample air pipe 130 and is finally collected in the canister 160.

Meanwhile, a cyclone 20 may be further provided at the lower part of the filter device 110, and relatively heavy solids contained in the sample air may be filtered by gravity falling into the cyclone 20.

The sample air collecting pump 120 includes a first stage 121 and a second stage 122, and the first stage 121 of the sample air collecting pump 120 is connected to an upper connection pipe of the filter device 110. 111 and the second end 122 of the sample air collection pump 120 is connected to the sample air pipe 130. The sample air collecting pump 120 sucks sample air through the first end 121 and discharges the sucked sample air to the sample air pipe 130 through the second end 122 . When collecting the sample air, the first stage 121 of the sample air collecting pump 120 acts as a suction end and the second stage 122 acts as a discharge end. The first stage 121 operates as a suction stage and the second stage 122 operates as a discharge stage. This will be described in detail in the cleaning method of the sample air collecting device.

As described above, the sample air introduced into the sample air pipe 130 via the filter device 110 and the first stage 121 and the second stage 122 of the sample air collection pump 120 is released from the release valve 140. ), the first pressure gauge 141, the pressure control valve 150, and the second pressure gauge 151 are collected in the canister 160, the configuration of the release valve 140 and the pressure control valve 150 It is possible to control the collection time of the sample air collected in the canister 160 through.

The release valve 140 serves to keep the pressure of the sample air passing through the release valve 140 constant. The release valve 140 releases pressure equal to or greater than the accommodating pressure to the outside when a pressure higher than the accommodating pressure is applied, and the pressure of the sample air applied by the second end 122 of the sample air collecting pump 120 is released. If it is greater than the receiving pressure of the valve 140, the pressure corresponding to the difference is released by the release valve 140. Therefore, even if the pressure of the sample air applied by the second stage 122 of the sample air collecting pump 120 is greater than the accommodating pressure of the release valve 140, the pressure of the sample air passing through the release valve 140 is the release valve 140. It is maintained at the receiving pressure of the valve 140. With this principle, the pressure of the sample air passing through the release valve 140 can be kept constant. For example, if the pressure of the sample air applied by the second stage 122 of the sample air collecting pump 120 is 35 psi and the receiving pressure of the release valve 140 is 30 psi, the sample passing through the release valve 140 The air pressure is maintained at 30 psi. In addition, the pressure of the sample air passing through the release valve 140 is measured by the first pressure gauge 141 .

The pressure control valve 150 adjusts the pressure of the sample air collected in the canister 160 to adjust the collection time of the sample air collected in the canister 160 . Since the canister 160 has a certain volume, the collection time of the canister 160, that is, the time to fill the canister 160 with the sample air is determined according to the pressure of the sample air. As the pressure of the sample air passing through the pressure control valve 150 increases, the collection time of the canister 160 shortens, and as the pressure of the sample air decreases, the collection time of the canister 160 increases. Accordingly, by adjusting the pressure of the sample air through the pressure control valve 150, the collection time of the sample air collected in the canister 160 can be selectively controlled. At this time, as the sample air passing through the release valve 140 passes through the pressure control valve 150, the pressure of the sample air passing through the pressure control valve 150 is the same as that of the sample passing through the release valve 140. It cannot be higher than the air pressure, and the pressure controlled by the pressure control valve 150 is adjusted to be smaller than the pressure of the sample air passing through the pressure control valve 150. For example, if the pressure of the sample air passing through the release valve 140 is 30 psi, the pressure of the sample air passing through the pressure control valve 150 may be adjusted to a smaller value of 10 psi.

As described above, the sample air passing through the pressure control valve 150 through the pressure control valve 150 in a state where the pressure of the sample air passing through the release valve 140 is kept constant through the release valve 140. By adjusting the pressure of the sample air collected in the canister 160, it is possible to control the collection time.

Meanwhile, in the process of being collected in the canister 160 through the release valve 140 and the pressure control valve 150, the pressure of the sample air passing through the pressure control valve 150 increases as the canister 160 is filled with sample air. It is close to the pressure of the sample air passing through the valve 140, and when the canister 160 is completely filled with the sample air, the pressure of the release valve 140 and the pressure of the pressure control valve 150, that is, the first pressure gauge ( The pressure measured by 141) and the pressure measured by the second pressure gauge 151 become the same. As the canister 160 is filled with sample air while the pressure control valve 150 is open, the pressure of the pressure control valve 150 gradually rises close to the pressure of the release valve 140 to achieve an equilibrium state of pressure. Because.

In the above, the sample air collecting device and its operation according to an embodiment of the present invention have been described. Next, a cleaning method of the sample air collecting device according to an embodiment of the present invention will be described.

When the canister 160 is filled with sample air, an analysis process for gaseous substances is performed for the sample air collected in the canister 160. After this process is completed, in order to collect and analyze new sample air, the canister 160 ) should be empty. However, the collected sample air may remain in the sample air collecting device including the canister 160, and in order to collect new sample air, the remaining sample air is required to be discharged. Remaining sample air may exist in the sample air pipe 130 and the filter device 110 as well as the canister 160 .

To discharge the remaining sample air, with the canister 160 and the pressure regulating valve 150 fully open, a suction force is applied through the first end 121 of the sample air collecting pump 120 so that the canister 160 and The sample air remaining in the sample air pipe 130 is sucked (see S301 in FIG. 3 and FIG. 4A). The remaining sample air sucked through the first stage 121 of the sample air collecting pump 120 is discharged through the second stage 122 of the sample air collecting pump 120 and discharged to the outside through the filter device 110 It becomes (see S302 in FIG. 3). Through this process, the sample air remaining in the canister 160 and the sample air pipe 130 may be discharged to the outside. It has been described above that the first stage 121 of the sample air collecting pump 120 serves as a suction stage and the second stage 122 serves as a discharge stage when collecting sample air. The second stage 122 serves as a suction stage and the first stage 121 serves as a discharge stage.

In the state where the remaining sample air is discharged, a flushing process using cleaning gas is performed. A cleaning gas supply tank 30 is provided at one side of the sample air collection pump 120 for flushing using the cleaning gas. With the canister 160 and the pressure control valve 150 open, the cleaning gas stored in the cleaning gas supply tank passes through the second end 122 of the sample air collecting pump 120 to the sample air pipe 130 and the canister ( 160) (see S303 of FIG. 3 and FIG. 4B). In a state where a certain amount of cleaning gas is injected, the cleaning gas injected into the canister 160 and the sample air pipe 130 through the second stage 122 of the sample air collecting pump 120, similarly to the case of discharging the remaining sample air, The flushing process is completed by suctioning and discharging to the outside through the first stage 121 of the sample air collecting pump 120 (see S304 and S305 in FIG. 3 and FIG. 4C). This flushing process may be repeated a plurality of times as needed, and an inert gas such as nitrogen or argon or clean air may be used as the cleaning gas.

10: sample air inlet 20: cyclone
30: cleaning gas supply tank
110: filter device 111: upper connector
112: lower connector 113: filter holder
114: coupling member 120: sample air collecting pump
121: first stage 122: second stage
130: sample air pipe 140: release valve
141: first pressure gauge 150: pressure control valve
151: second pressure gauge 160: canister

Claims (9)

A filter device for filtering particulate matter included in the sample air from the sample air introduced by the operation of the sample air collecting pump;
a sample air collecting pump for sucking sample air by applying a suction force and discharging the sucked sample air to a sample air pipe;
a release valve provided on the sample air pipe to maintain the pressure of the sample air discharged from the sample air collecting pump at a constant pressure;
a pressure control valve provided on the sample air pipe at the rear end of the release valve to adjust the pressure of the sample air; and
A canister for collecting sample air that has sequentially passed through the release valve and the pressure control valve of the sample air pipe;
While the pressure of the sample air passing through the release valve is maintained at a constant pressure by the release valve, the pressure of the sample air passing through the pressure control valve is adjusted through the pressure control valve to shorten the collection time of the sample air collected in the canister. A sample air collecting device characterized in that it can be controlled.
The method of claim 1, wherein the filter device is configured to include an upper connection pipe, a lower connection pipe, a filter holder, a filter and a coupling member,
The upper connector and the lower connector are combined to provide a space in which the filter holder is mounted and a space in which sample air is introduced,
One end of the upper connection pipe is connected to the first stage of the sample air collecting pump to transmit the suction force of the sample air collecting pump, and one end of the lower connecting pipe is connected to the sample air inlet, and the suction force of the first stage of the sample air collecting pump is transmitted to the upper portion. It is delivered to the sample air inlet through the connecting pipe and the lower connecting pipe,
A filter holder is mounted in the inner space where the upper connection pipe and the lower connection pipe are joined, and a filter for filtering particulate matter is provided in the filter holder,
The coupling member is mounted on the outer surface of the portion where the upper connector and the lower connector are coupled in a state in which the upper connector and the lower connector are coupled to strengthen the coupled state of the upper connector and the lower connector. Sample air collecting device.
The method of claim 2, wherein the upper connection pipe is made of a polymer material and the lower connection pipe is made of a metal material, so that when the upper connection pipe and the lower connection pipe are coupled, the upper connection pipe and the lower connection pipe are formed due to flexibility of the upper connection pipe. A sample air collecting device, characterized in that the sealing state between the connecting tubes is strengthened.
The method of claim 1, wherein a first pressure gauge is provided at the rear end of the release valve to measure the pressure of the sample air passing through the release valve, and a first pressure gauge is provided at the rear end of the pressure control valve to measure the pressure of the sample air passing through the pressure control valve. A sample air collecting device further comprising a second pressure gauge for measuring.
The method of claim 1, wherein the sample air collecting pump has a first stage and a second stage, the first stage of the sample air collecting pump is connected to the upper connection pipe of the filter device, and the second stage of the sample air collecting pump is connected to the upper connection pipe of the filter device. connected to the air pipe,
The sample air collecting device, characterized in that the sample air collecting pump sucks the sample air through the first stage and discharges the sucked sample air to the sample air pipe through the second stage.
The method of claim 1, wherein the pressure of the sample air passing through the pressure regulating valve becomes closer to the pressure of the sample air passing through the release valve as the canister is filled with sample air in the process of being collected in the canister through the release valve and the pressure regulating valve. , The sample air collecting device, characterized in that when the canister is completely filled with sample air, the pressure of the release valve and the pressure of the pressure control valve become the same.
The sample air collecting device according to claim 1, wherein a cyclone may be further provided at the lower part of the filter device, and relatively heavy solids included in the sample air fall by gravity into the cyclone.
In the cleaning method of the sample air collecting device according to any one of claims 1 to 7,
applying a suction force to a first stage of the sample air collecting pump to suck in remaining sample air existing in the canister and the sample air pipe and discharging it through a second stage of the sample air collecting pump;
injecting the cleaning gas into the sample air pipe and the canister by discharging the cleaning gas through the first stage of the sample air collecting pump; and
A step of applying a suction force to the first stage of the sample air collecting pump to suck the cleaning gas injected into the canister and the sample air pipe, and discharging the sucked cleaning gas through the second stage of the sample air collecting pump; Cleaning method of the sample air collecting device, characterized in that.
9. The method of claim 8, wherein the cleaning gas is an inert gas or air.

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