TWM507518U - VOCs measurement system - Google Patents

Abstract

A VOCs measurement system is provided. The VOCs measurement system is used to measure the gas components with volatile organic compounds, wherein a gas sample is extracted from the source through a heated sample line for avoiding the gas sample condenses in the sample line, thus a variety of gas sample does not cross contamination.

Description

Volatile organic matter quality measurement system

The present invention relates to a volatile organic matter mass measurement system, and more particularly to a volatile organic matter quality measurement system for measuring gases in a gaseous environment.

With the advancement of the human industry, air pollution is gradually increasing. Therefore, all major industrial countries in the world have regulatory standards for the emission of volatile organic compounds (VOCs), and there is a growing trend that industrial gas environments are often required to be retrofitted. A measurement system that measures the composition of volatile organic compounds in a gas.

The above volatile organic substances generally refer to organic compounds which have a boiling point of less than 250 ° C under standard conditions (0 ° C and 760 mmHg), and even some people directly define volatile organic substances as all organically present in the atmosphere in a gaseous state. A compound comprising an organic compound such as total hydrocarbon (THC) or non-methane total hydrocarbon (NMHC).

Volatile organic matter measurement systems typically include a flame ion gas chromatograph (GC-FID) to ionize volatile organic compounds through the flame and detect the electronic signal using the conductive properties of the ions. The circuit component outputs a signal, and parameters such as the concentration of volatile organic substances in the gas environment can be converted to determine whether the gas in the gas environment meets the emission standard.

However, current volatile organic matter quality measurement systems often introduce sample gas between multiple measurement points in the gas environment in the same pipeline due to pipeline design problems, and multiple measurements. The sample gas between the points is in the same pipeline, and there is a problem of cross-contamination, which leads to the question of the accuracy of measurement of volatile organic substances.

Therefore, how to provide a measurement system for volatile organic substances to solve the problem of cross-contamination of sample gases between multiple measurement points has become a technical issue of current concern to the industry.

In view of the above-mentioned shortcomings of the prior art, the present invention proposes a volatile organic matter mass measurement system for measuring gas in a gaseous environment, which comprises a gas collection step and a gas chromatography step in sequence. The volatile organic matter mass measurement system includes a plurality of sample collection lines, a sample selection valve, a sample guiding line, a first sample storage tank, a second sample storage tank, a gas chromatography sensing device, and a gas positive Pressure source, gas negative pressure source, gas separation tube, oven and controller. A plurality of sample collection lines are used to separately collect sample gases at different measurement points in the gaseous environment. The sample selection valve can optionally be in communication with any of a plurality of sample collection lines. The sample guiding line is connected to the sample selection valve to receive the sample gas in the sample collection line connected by the sample selection valve as the gas to be tested and to guide the flow. The gas separation tube is disposed between the gas chromatography sensing device and the second sample storage tank for separating the specified gas compound in the gas to be tested. The oven has an internal space and a heater, and the heater can heat the internal space to bring the internal space to a predetermined temperature, and avoid the sample selection valve, the sample introduction line, the first sample storage tank, and the second in the internal space. The sample gas storage tank condenses with the gas to be tested in the gas separation tube. When the gas collection step is performed, the controller causes the sample guiding line, the first sample storage tank, the second sample storage tank and the gas negative pressure source to communicate with each other, and the gas negative pressure source provides a negative pressure to make the sample The gas to be tested in the guiding pipeline enters and fills the first sample storage tank and the second sample storage tank. When performing the gas chromatography step, the controller causes the sample guiding line, the first sample storage tank, and the second sample to store gas The communication between the tank and the gas negative pressure source is interrupted; and the gas positive pressure source, the first sample gas storage tank and the gas chromatography sensing device are connected to each other, and the gas positive pressure source is provided with a positive pressure, so that the first The gas to be tested stored in the sample storage tank enters the gas chromatography sensing device for analysis and processing; further, the gas positive pressure source, the gas separation tube, the second sample storage tank and the gas chromatography sensing device are mutually Connected, and the positive pressure source of the gas provides a positive pressure, so that the gas to be tested stored in the second sample storage tank enters the gas chromatography sensing device after passing through the gas separation tube for analysis and processing; The gas negative pressure source is connected to each other, and the gas negative pressure source provides a negative pressure to discharge the gas to be tested in the sample guiding pipeline to the outside.

Optionally, when the gas collection step is performed, the controller causes the gas negative pressure source to provide a negative pressure, so that the sample guides the gas to be tested in the pipeline, and excludes the sample guiding pipeline, the first sample storage tank, and the first A residue in the two sample gas storage tank that is not a gas to be tested. When the gas gas chromatography step is performed, the controller provides a positive pressure to the gas positive pressure source, so that the gas to be tested stored in the first sample storage tank and the second sample storage tank is completely entered into the gas chromatography. The sensing device performs an analysis process.

Optionally, the method further includes a first switching valve disposed in the sample collection line, and a second switching valve disposed in the sample guiding line, when performing the gas collection step, After a sample storage tank and a second sample storage tank fill the gas to be tested, the controller causes the first switching valve to interrupt the communication between the sample collection line and the sample selection valve, and causes the second switching valve to interrupt the sample guiding tube. The communication between the road and the gas negative pressure source also causes the first switching valve and the second switching valve to open both ends of the sample guiding pipeline in the atmosphere, so that the first sample storage tank and the second sample storage tank The gas pressure of the gas to be tested is substantially in accordance with atmospheric pressure.

Optionally, the oven further has a first warning device; when the heater heats the internal space of the oven for a period of time, if the temperature of the internal space has not been able to reach the predetermined temperature, and the oven door is not normally closed Position, the controller causes the first warning device to issue a warning to remind the drying The position of the box door is abnormal; if the temperature of the internal space has not been able to reach the predetermined temperature, and the door of the oven is in the normally closed position, the controller causes the first warning device to issue a warning to remind the heater or the oven of the oven Abnormal; if the temperature of the internal space has not been able to reach the predetermined temperature, the controller interrupts the connection between the sample selection valve and the sample collection line, and provides a negative pressure to the gas negative pressure source, and the sample guide line, the first sample The gas to be tested in the gas storage tank and the second sample storage tank is discharged to the outside.

The oven comprises two heaters, and the heating of the inner space is achieved by one of the two heaters. When one of the heaters is abnormal, the other heater is replaced by heating the inner space to make the temperature of the inner space Arrived at the predetermined temperature.

Optionally, the gas chromatography sensing device is a flame ion gas chromatography sensing device, and has a flame generator, an igniter and a second warning device. When the flame generator does not generate a normal flame for a period of time, The controller causes the igniter to ignite the flame generator; when the ignition of the igniter exceeds a predetermined number of times and the flame generator still fails to generate a normal flame, the second warning device is alerted to notify the gas chromatography sensing device that the gas is abnormal. .

Optionally, a sample discharge valve is further included, and the controller causes the gas negative pressure source to provide a negative pressure through the sample discharge valve to discharge the sample gas in the sample collection line that is not selectively connected to the sample selection valve to the outside. Also included is a gas processor that processes the gas to be vented to the outside to meet gas emission standards and selectively communicates with the sample guiding line for measurement of volatile organic matter. Whether the treated gas meets the gas emission standards.

Optionally, a flow meter is further disposed in the sample guiding line for measuring the flow rate of the gas to be tested in the sample guiding line, and the measured gas flow value to be measured can be used to determine the sample guiding tube. Is the road, sample collection line and sample selection valve abnormal? At least one sample collection line is provided with a filter and a cleaning valve, and the filter is used for filtering dust or moisture in the collected sample gas. When the condition of the filter is not good, the controller causes the cleaning valve to supply air to the filter via the sample collection line, leaving the dust or moisture remaining on the filter.

Compared to the prior art, the volatile organic matter quality measurement system of the present invention can provide a high temperature environment, avoiding the sample selection valve, the sample introduction line, the first sample storage tank, the second sample storage tank and the gas separation. The gas to be tested in the tube is condensed, and the contamination of the gas to be tested at the next measurement point is reduced, and the problem of the mutual contamination of the sample gas between the plurality of measurement points is solved. In addition, a gas separation tube is provided, and the specified gas compound can be separated in the gas to be tested, thereby obtaining parameters such as the concentration of the volatile organic substance specified or containing the specified gas compound in the gas to be tested.

1‧‧‧Volatile Organic Matter Quality Measurement System

111‧‧‧ Sample collection line

1111‧‧‧Filter

112‧‧‧sample guiding line

113‧‧‧ gas discharge pipeline

121‧‧‧Sample selection valve

122‧‧‧sample discharge valve

123‧‧‧First switching valve

124‧‧‧Second switching valve

125‧‧‧cleaning valve

131‧‧‧First sample gas storage tank

132‧‧‧Second sample storage tank

14‧‧‧Gas tomography sensing device

141‧‧‧ Flame Generator

151‧‧‧ gas positive pressure source

152‧‧‧ gas negative pressure source

16‧‧‧ gas separation tube

17‧‧‧ oven

171‧‧‧Internal space

18‧‧‧ gas processor

19‧‧‧ Flowmeter

Figure 1 is a block diagram of the VOC quality measurement system for gas collection.

Figure 2 is a block diagram of a volatile organic matter mass measurement system for gas chromatography.

Figure 3 is a block diagram of the gas collection step of the treated volatile organic matter mass measurement system for the treated gas.

Figure 4 is a schematic view showing the addition of a filter and a cleaning valve to the sample collection line in the present volatile organic matter mass measurement system.

The following content will be described in conjunction with the drawings, and the technical contents of the present invention will be described by a specific embodiment. Those skilled in the art can easily understand other advantages and effects of the present invention by the contents disclosed in the present specification. This creation can also be implemented or applied by other different embodiments. This description The details of the book can also be based on different opinions and applications, and various modifications and changes can be made without departing from the spirit of the present invention. In particular, the proportional relationship and relative position of the various elements in the drawings are for exemplary purposes only and are not representative of actual implementation of the present invention.

The VOC system of the present invention is used for measuring gas in a gaseous environment, and the operation includes a gas collection step and a gas chromatography step in sequence. Referring to FIG. 1 to FIG. 2, the volatile organic matter mass measurement system 1 of the present invention has a plurality of sample collection lines 111, a sample selection valve 121, a sample guiding line 112, a first sample storage tank 131, and a first A sample storage tank 132, a gas chromatography sensing device 14, a gas positive pressure source 151, a gas negative pressure source 152, a gas separation tube 16, an oven 17, and a controller.

A plurality of sample collection lines 111 are used to separately collect sample gases at different measurement points in the gas environment. In the embodiment shown in FIG. 1 and FIG. 2, the volatile organic matter quality measurement system 1 has six sample collection lines. 111, to separately collect sample gases of six different measurement points in a gas environment. It should be noted that the number of sample collection pipelines in the present volatile organic matter quality measurement system is not limited to the above six, and the number of sample collection pipelines can be appropriately adjusted according to the actual implementation. One end of the sample selection valve 121 can be selectively connected to any one of the plurality of sample collection lines 111 at a time to receive the sample gas in the connected sample collection line 111, that is, only one of the gas environments at a time Sample gas from the sample collection line of the measurement point is collected. The other end of the sample selection valve 121 is connected to the sample guiding line 112 to allow the received sample gas to enter the sample guiding line 112. The sample guiding line 112 takes the received sample gas as a gas to be tested and guides the flow in the pipe body.

Alternatively, as in the embodiment shown in FIG. 4, the sample collection end of the sample collection line 111 may be provided with a filter 1111 and a cleaning valve 125. The filter 1111 is used to filter dust or moisture in the sample gas collected by the sample collection line 111. When the filter 1111 accumulates excessive dust or water When the gas causes the state to be poor, the controller may cause the cleaning valve 125 to supply the flushing airflow to the filter 1111 via the sample collecting line 111, and leave the dust or moisture remaining on the filter 1111, and increase the filter 1111. Service life. In addition, the flushing airflow provided by the cleaning valve 125 can be heated by heat treatment to improve the ability to remove dust or moisture from the filter 1111.

In addition, the volatile organic matter mass measurement system 1 of the present invention may further be provided with a flow meter 19, which is disposed in the sample guiding line 112 for measuring the flow rate of the gas to be tested in the sample guiding line 112, if If the flow rate of the gas to be measured measured by the flow meter 19 deviates from the expected value, it represents an abnormality in the sample guiding line 112. Therefore, the setting of the flow meter 19 can be used to determine whether the sample guiding line 112 is abnormal, and facilitates immediate elimination. The sample guides the abnormality of the line 112. Furthermore, it is also possible to judge whether the sample collection line 111 and the sample selection valve 121 are abnormal in the case where it is confirmed that the sample guiding line 112 is free from abnormality.

As shown in the embodiment of Figures 1 and 2, the volatile organic matter mass measurement system 1 is further provided with a sample discharge valve 122. The controller can make the sample discharge valve 122 and the sample collection line 111 not selected by the sample selection valve 121 communicate with the gas negative pressure source 152, and the gas negative pressure source 152 provides a negative pressure, and the sample selection valve 121 is not selected. The sample gas in the sample collection line 111 is discharged to the outside via the sample discharge valve 122 to solve the contamination problem of the sample gas between the unselected plurality of sample collection lines 111.

The gas separation tube 16 is disposed in the sample guiding line 112 and located between the gas chromatography sensing device 14 and the second sample storage tank 132 for separating the gas to be tested of the second sample storage tank 132. The specified gas compound is passed, and the gas compound specified in the gas to be tested is passed. In an embodiment of the present invention, the gas separation tube 16 is a molecular sieve that allows only the specified methane in the gas to be tested to pass, but is not limited thereto.

As shown in FIGS. 1 to 3, the range of the oven 17 housing is indicated by a broken line, and the sample guiding line 112, the first sample storage tank 131, the second sample storage tank 132, and the gas separation tube 16 are attached to The interior 17 of the oven 17 is in the interior 171. The oven 17 has a heater to heat the internal space 171 of the casing to bring the internal space 171 to a predetermined temperature, while avoiding the sample guiding line 112, the first sample storage tank 131, and the second sample in the internal space 171. The gas storage tank 132 and the gas to be tested in the gas separation tube 16 are condensed to cause residual or blockage, and the chance of contamination of the gas to be tested at the next measurement point is reduced, and the sample introduction line 112 and the first sample are also improved. The service life of the gas storage tank 131, the second sample storage tank 132 and the gas separation tube 16.

Furthermore, the box of the oven 17 can also optionally be provided with a temperature sensor, a position sensor and a first warning device. The controller may cause the temperature sensor to sense the temperature of the internal space 171 of the cabinet to determine whether the temperature of the internal space 171 of the cabinet reaches a predetermined temperature. The controller can also command the position sensor to sense the position of the box door of the box to determine whether the box door of the box is in the normally closed position.

After the heater heats the internal space of the box for a period of time, if the temperature of the internal space 171 of the box has not been able to reach the predetermined temperature, and the position sensor senses that the box door of the box is not normally closed. The position indicates that the temperature of the internal space 171 of the box is not as expected. The reason may be that the door is not normally closed and the heat in the internal space of the box is largely lost. At this time, the controller may command the first warning device to issue a warning to remind The position of the operator's cabinet door is abnormal.

After the heater heats the internal space of the cabinet for a period of time, if the temperature of the internal space 171 of the cabinet has not been able to reach the predetermined temperature, and the position sensor senses that the box door of the cabinet is in the normally closed position. The reason that the temperature of the internal space 171 of the box is not as expected may be that the heater is abnormal and cannot supply heat to the internal space 171 of the box, or the abnormality of the box causes a large amount of heat to escape. At this time, the controller can make A warning device alerts the operator that the heater or cabinet is abnormal.

After the heater heats the internal space 171 of the casing for a period of time, if the temperature of the internal space of the casing has not been able to reach the predetermined temperature, the controller interrupts the communication between the sample selection valve 121 and the sample guiding pipe 112. Stop filling the sample guiding line 112 with the gas to be tested, and let the gas negative pressure source 152 provide a negative pressure, and the sample guiding line 112, the first sample storage tank 131 and the second sample storage tank 132 are to be tested. The gas is discharged to the outside, and the sample guiding line 112 in the inner space 171 of the casing, the gas to be tested in the first sample storage tank 131 and the second sample storage tank 132 are prevented from being condensed to cause residual or clogging, and the enthalpy is reduced. The contamination of the gas to be tested at the next measurement point can also increase the service life of the product introduction line 112, the first sample storage tank 131, and the second sample storage tank 132.

In an embodiment of the present invention, the oven 17 may be provided with two heaters, and the heating of the inner space of the oven 17 is achieved by one of the two heaters. When one of the heaters is abnormal, Another heater is used to heat the internal space of the oven 17 to bring the temperature of the interior of the oven 17 to a predetermined temperature.

When the volatile organic matter mass measurement system of the present invention performs the gas collection step, the controller causes the sample guiding line 112, the first sample storage tank 131, the second sample storage tank 132, and the gas negative pressure source 152 to be mutually Connected, and the gas negative pressure source 152 provides a negative pressure, so that the gas to be tested in the sample guiding line 112 enters and fills the first sample storage tank 131 and the second sample storage tank 132, and the test is completed. Gas collection.

At this time, the controller may also provide a negative pressure to the gas negative pressure source 152 to cause the sample to be tested in the pipeline 112 to exclude the sample guiding line 112, the first sample storage tank 131 and the second sample storage gas. In the groove 132, the residual body of the gas to be tested which is not the current measuring point, that is, the gas to be tested excluding the previous measuring point is in the sample guiding line 112, the first sample storage tank 131 and the second sample storage. Residual bodies in the gas channel 132.

As shown in FIG. 1 and FIG. 2, the volatile organic matter mass measurement system 1 is further provided with a first switching valve 123 and a second switching valve 124, and the first switching valve 123 is disposed in the sample collection line 111, and The second switching valve 124 is disposed in the sample guiding line 112. When the gas collecting step is performed, after the first sample storage tank 131 and the second sample storage tank 132 are filled with the gas to be tested, the controller is ordered A switching valve 123 interrupts the communication between the sample collection line 111 and the sample selection valve 121, and causes the second switching valve 124 to interrupt the communication of the sample guiding line 112 with the gas negative pressure source 152, and also causes the first switching valve 123 and the second The switching valve 124 respectively opens both ends of the sample guiding line 112 in the atmosphere, so that the gas pressure of the gas to be measured of the first sample storage tank 131 and the second sample storage tank 132 during the gas chromatography step is performed. It is in fact in line with atmospheric pressure to prevent the gas pressure of the gas to be tested from fluctuating.

When the volatile organic matter mass measurement system of the present invention performs a gas chromatography step, the controller causes the sample guiding line 112, the first sample storage tank 131, the second sample storage tank 132, and the gas negative pressure source. 152 is disconnected from each other; and the gas positive pressure source 151, the first sample gas storage tank 131 and the gas chromatography sensing device 14 are connected to each other, and the gas positive pressure source 151 is supplied with a positive pressure, so that the first The gas to be tested stored in the product storage tank 131 enters the gas chromatography sensing device 14 for analysis processing, and obtains parameters such as the concentration of volatile organic substances in the gas to be tested.

At this time, the controller further allows the gas positive pressure source 151, the gas separation tube 16, the second sample storage tank 132 and the gas chromatography sensing device 14 to communicate with each other, and the positive pressure source 151 provides a positive pressure. The gas to be tested stored in the second sample storage tank 132 passes through the gas separation tube 16 and enters the gas chromatography sensing device 14 for analysis, thereby obtaining volatile organic substances of the specified gas compound in the gas to be tested. Concentration and other parameters. Moreover, the controller can also allow the sample guiding line 112 and the gas negative pressure source 152 to communicate with each other, and the gas negative pressure source 152 provides a negative pressure to guide the sample to be tested in the pipeline 112. The body is discharged to the outside, and the contamination of the sample guiding line 112 by the gas to be tested is reduced, and the gas to be tested of the next measuring point is prevented from being contaminated, and the service life of the sample guiding line 112 can also be increased.

When the sample gas gas chromatography step is performed, the controller can also provide a positive pressure to the positive gas source 151 to completely store the gas to be tested stored in the first sample storage tank 131 and the second sample storage tank 132. The gas chromatography sensing device 14 is entered for analysis processing to avoid contamination of the gas to be tested at the next measurement point.

In an embodiment of the invention, the gas chromatography sensing device is a flame ion gas chromatography sensing device, and has a flame generator, a flame detector, an igniter and a second warning device. The flame detector is used to detect whether the flame generator produces a normal flame. When the flame generator does not produce a normal flame for a period of time, the controller commands the igniter to ignite the flame generator. When the ignition of the igniter exceeds a predetermined number of times and the flame generator still fails to generate a normal flame, the second warning device is alerted to notify the gas chromatography sensing device that the abnormality is helpful for troubleshooting.

Further, in the embodiment shown in FIG. 3, the volatile organic matter mass measurement system of the present invention may optionally include a gas processor 18 and a gas discharge line 113. The gas processor 18 is used to treat the gas to be discharged to the outside world, and removes the gas compound in the gas to meet the general gas emission standards. The gas discharge line 113 receives the gas processed by the gas processor 18. Alternatively, the controller may connect the gas discharge line 113 with the sample guiding line 112, thereby sequentially performing a gas collection step and a gas chromatography step on the gas of the gas discharge line 113, and measuring Among them, the volatile organic substance, and whether the gas processed by the gas processor 18 meets the general gas emission standard, can also know whether the function of the gas processor 18 is normal.

In summary, the volatile organic matter mass measurement system provided by the present invention is used for measuring gas in a gas environment, and includes a gas collection step and gas chromatography in sequence. a step, and providing a high temperature environment, avoiding condensation of the gas to be tested in the sample selection valve, the sample introduction line, the first sample storage tank, the second sample storage tank and the gas separation tube, and reducing the amount to the next amount The pollution of the gas to be measured at the measuring point is such that the cross-contamination problem of the gas to be tested at the plurality of measuring points is solved.

Moreover, in the gas collection step, the gas to be tested can exclude the gas in the sample guiding line, the first sample storage tank and the second sample storage tank that is not the gas to be tested, and is in the gas phase. During the chromatography step, the gas to be tested of the first sample storage tank, the second sample storage tank and the sample guiding pipeline can be discharged, so that the chance of cross-contamination of the gas to be tested at the plurality of measuring points can be greatly reduced.

The above embodiments are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Modifications and variations of the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be as defined in the scope of the invention.

1‧‧‧Volatile Organic Matter Quality Measurement System

111‧‧‧ Sample collection line

112‧‧‧sample guiding line

113‧‧‧ gas discharge pipeline

121‧‧‧Sample selection valve

122‧‧‧sample discharge valve

123‧‧‧First switching valve

124‧‧‧Second switching valve

131‧‧‧First sample gas storage tank

132‧‧‧Second sample storage tank

14‧‧‧Gas tomography sensing device

141‧‧‧ Flame Generator

151‧‧‧ gas positive pressure source

152‧‧‧ gas negative pressure source

16‧‧‧ gas separation tube

17‧‧‧ oven

171‧‧‧Internal space

18‧‧‧ gas processor

19‧‧‧ Flowmeter

Claims (10)

A volatile organic matter mass measurement system for measuring gas in a gaseous environment, comprising a gas collection step and a gas chromatography step in sequence, comprising: a plurality of sample collection pipelines, The sample gas is used to separately collect different sample points in the gas environment; the sample selection valve may be selectively connected to any of the sample collection lines; the sample guiding line is connected to the sample selection valve to Receiving sample gas in the sample collection line connected by the sample selection valve as a gas to be tested and guiding the flow; a first sample storage tank; a second sample storage tank; a gas chromatography sensing device; a gas source; a gas separation tube disposed between the gas chromatography sensing device and the second sample storage tank for separating a specified gas compound in the gas to be tested; , having an internal space and a heater, the heater heating the internal space to bring the internal space to a predetermined temperature, and avoiding the sample selection valve, the sample introduction line, and the first in the internal space a sample gas storage tank, a second sample gas storage tank and a gas to be tested in the gas separation tube are condensed; and a controller; wherein, when the gas collection step is performed, the controller causes the sample to guide the pipeline, the same The product storage tank, the second sample storage tank and the gas negative pressure source are connected to each other, and the gas negative pressure source provides a negative pressure, so that the sample guides the gas to be tested in the pipeline, enters and fills the first a product storage tank and the second sample storage tank; and when performing the gas chromatography step, the controller directs the sample guiding line, the first sample storage tank, and the second sample storage tank The gas negative pressure source is disconnected from each other; and the gas positive pressure source, the first sample gas storage tank and the gas chromatography sensing device are connected to each other, and the gas positive pressure source is provided with a positive pressure, so that the first The gas to be tested stored in a sample storage tank enters the gas chromatography sensing device for analysis and processing; further, the gas positive pressure source, the gas separation tube, the second sample storage tank and the gas chromatography tomography The measuring devices are connected to each other, and the positive pressure source of the gas is supplied with a positive pressure to make the second sample The gas to be tested stored in the gas tank enters the gas chromatography sensing device for analysis after passing through the gas separation tube; and the sample guiding pipeline and the gas negative pressure source are connected to each other, and the gas is negatively pressurized. The source provides a negative pressure to allow the gas to be tested in the sample guiding line to be discharged to the outside. The volatile organic matter mass measurement system of claim 1, wherein when the gas collection step is performed, the controller causes the gas negative pressure source to provide a negative pressure to cause the sample to be guided in the pipeline. The gas to be tested excludes the sample guiding line, the first sample storage tank and the residual body of the second sample storage tank not belonging to the gas to be tested; when the gas gas chromatography step is performed, the control The gas source positive pressure source is provided to enable the gas to be tested stored in the first sample gas storage tank and the second sample gas storage tank to completely enter the gas chromatography sensing device for analysis and treatment. The volatile organic matter mass measurement system of claim 1, further comprising a first switching valve and a second switching valve, wherein the first switching valve is disposed in the sample collection line, and the second switching valve system Provided in the sample guiding line, when the gas collecting step is performed, after the first sample gas storage tank and the second sample gas storage tank are filled with the gas to be tested, the controller commands the first switching valve Disconnecting the sample collection line from the sample selection valve, and causing the second switching valve to interrupt the communication between the sample guiding line and the gas negative pressure source, and further causing the first switching valve and the second switching valve respectively The two ends of the sample guiding line are opened in the atmosphere, so that the gas pressure of the gas to be tested in the first sample storage tank and the second sample storage tank substantially conforms to atmospheric pressure. The volatile organic matter quality measuring system according to claim 1, wherein the oven further has a first warning device; if the heater heats the internal space of the oven for a period of time, if the internal space The temperature of the oven has not been able to reach the predetermined temperature, and the door of the oven is not in the normally closed position, the controller causes the first warning device to issue an alarm to remind the oven door that the position of the oven door is abnormal; if the internal space The temperature of the oven has not been able to reach the predetermined temperature, and the door of the oven is in the normally closed position, the controller causes the first warning device to issue an alarm to remind the heater or the oven of the oven to be abnormal; When the temperature of the internal space has not been able to reach the predetermined temperature, the controller interrupts the connection between the sample selection valve and the sample collection line, and the negative pressure source of the gas provides a negative pressure, and the sample guides the pipeline. The gas to be tested in a sample storage tank and the second sample storage tank is discharged to the outside. The volatile organic matter quality measuring system according to claim 4, wherein the oven comprises two heaters, and the heating of the inner space of the oven is achieved by one of the two heaters, wherein When one of the heaters is abnormal, the other heater takes over heating the internal space so that the temperature of the internal space can reach the predetermined temperature. The volatile organic matter mass measurement system according to claim 1, wherein the gas chromatography sensing device is a flame ion gas chromatography sensing device, and has a flame generator, an igniter, and a a second warning device, when the flame generator is unable to generate a normal flame for a period of time, the controller causes the igniter to ignite the flame generator; when the ignition of the igniter exceeds a predetermined number of times and the flame generator is still unable to When a normal flame is generated, the second alert is alerted to alert the gas chromatography sensing device to an abnormality. The volatile organic matter quality measuring system according to claim 1, further comprising a sample discharge valve, wherein the controller causes the gas negative pressure source to provide a negative pressure through the sample discharge valve, and the sample selection valve is not The sample gas in the connected sample collection line is selected to be discharged to the outside. The volatile organic matter quality measuring system according to claim 1, further comprising a gas processor for treating a gas to be discharged to the outside to comply with a gas emission standard, and optionally The treated gas is conducted to the sample guiding line for measurement of volatile organic substances, and it is judged whether the treated gas meets the gas emission standard. The volatile organic matter quality measuring system according to claim 1, further comprising a flow meter disposed in the sample guiding line for measuring a flow rate of the gas to be tested in the sample guiding line, thereby It is determined whether the sample guiding line, the sample collecting line and the sample selection valve are abnormal. The volatile organic matter mass measurement system of claim 1, wherein the at least one sample collection line is provided with a filter and a cleaning valve for filtering dust in the collected sample gas. Or water vapor, when the state of the filter is not good, the controller causes the cleaning valve to supply airflow to the filter via the sample collection line, and the dust or moisture remaining on the filter is removed.