TWI410618B - Gas analysis device and method - Google Patents

Abstract

A gas analysis apparatus and its method are provided. The gas analysis apparatus comprises a sampling unit used to sample a to-be-measured gas, a flow-splitting unit, an oxygen removal unit, a column unit, and a detection unit. The first, second and third flow splitters of the flow-splitting unit are switched to open or closed state at different time interval so that the gases to be measured can flow through the first, second and third separation columns of the column unit to separate three different substances, and the concentration of the substances can be detected by using the first and the second detectors of the detection unit so that the concentrations of different substances in the to-be-measured gas can be measured. It can not only accomplish the purpose of completing detection of multiple substances by a single sampling, but also achieve the effect of reducing cost by simplifying analysis operation.

Description

Gas analysis device and method

The present invention relates to an analytical device and method, and more particularly to a gas analyzing device and method.

In a typical oxygen plant, the gas in the process will generate dangerous substances, and the explosive substances often pose a threat to the safety of the site. Therefore, the collection and detection of the gas and the dangerous substances in the gas become Important topic.

Conventional methods for detecting dangerous substances in gases, such as hydrocarbons, are analyzed by flame ionization gas chromatography. The method is to collect samples by sampling bags and separate them by gas chromatography. The concentration of gaseous organic compounds in the sample is detected by a flame ionization detector, and substances such as carbon dioxide, argon and nitrogen are analyzed by an ionized gas chromatograph using ruthenium as a carrier gas.

In addition, nitrous oxide is detected by a non-dispersive infrared spectrum, and the non-dispersive infrared spectrum is carried out by utilizing the linear absorption characteristics of the gas, by absorbing the energy of the infrared electromagnetic wave (referred to as an infrared absorption spectrum) or in an excited state. The infrared radiation is emitted, and then the generated energy change is converted into a numerical value and then calculated to obtain an absorption curve of the gas to be tested, thereby completing the analysis and detection of the gas.

However, due to the above analysis, it is impossible to be dangerous to gas by flame ionization gas chromatograph, non-dispersive infrared spectroscopy, and ionization gas chromatograph with krypton as carrier gas. Explosive substance When the job analysis is performed, not only the operation procedure is complicated, but also the analysis process takes a lot of time, and the detection equipment using a plurality of different models also requires a large purchase cost.

Accordingly, it is an object of the present invention to provide a gas analysis method that simplifies detection operations.

Another object of the present invention is to provide a gas analysis device which can reduce the cost.

Thus, the gas analysis method of the present invention comprises a sampling step, a first type of analysis step, a second type of analysis step, and a third type of analysis step.

The sampling step is to first sample a gas to be tested, and fill the gas to be tested into a first shunt in a closed state, and a second shunt in a closed state.

The first type of analysis step is to first open the first flow divider, so that the gas to be tested in the first flow divider sequentially flows through a first separation pipe column, a third flow divider in an open state, and a first A detector, wherein the first separation column separates the gas to be tested into a first type of substance, and performs concentration detection on the first type of substance through the first detector.

The second type of analysis step is to first open the second diverter and close the first and third diverters, so that the gas to be tested in the second diverter sequentially flows through an oxygen scavenging unit and a second separating column. And a second detector, wherein the oxygen scavenging unit reduces the concentration of the gas to be tested, and the second separating column separates the gas to be tested into a second type of substance. And performing concentration detection on the second type of substance through the second detector.

The third type of analysis step is to first close the first, second, and third shunts, and sequentially flow the gas to be tested in the second shunt through a third separation column and the first detector, wherein The third separation column separates the gas to be tested into a third type of substance, and performs concentration detection on the third type of substance through the first detector.

The gas analysis device of the present invention comprises a sample selection unit for sampling a gas to be tested, a flow dividing unit, an oxygen scavenging unit, a column unit, and a detecting unit.

The flow dividing unit includes a first flow divider connected to the sample selection unit, a second flow divider connected to the first flow divider, and a third flow divider connected to the second flow divider, wherein the first and second The three-shunt can control the flow direction of the gas to be tested.

The oxygen scavenging unit is connected to the second flow divider and is used to reduce the oxygen concentration in the gas to be tested.

The column unit includes a first separation pipe string connecting the first flow divider and the third flow divider, a second separation pipe column connecting the oxygen removal unit, and a third separation pipe connected to the second flow divider. column.

The detecting unit has a first detector connected to the third splitter, and a second detector connected to the second splitting column, wherein the first and second detectors can detect the waiting The concentration of the substance that measures the gas.

The utility model has the advantages that the first, second and third diverters are switched into an open or closed state at different time periods, so that the gas to be tested can be separately separated through the first, second and third separation pipes. three Different substances, and using the first and second detectors to detect the concentration of the substance, thereby measuring the concentration of a plurality of different substances in the gas to be tested, not only can achieve a single sampling to complete a plurality of substances detection The effect can be reduced by the simplified analysis work.

The foregoing and other objects, features, and advantages of the invention are set forth in the <RTIgt;

Referring to Figures 1 and 2, a preferred embodiment of the gas analysis device of the present invention comprises a sample selection unit 3 for sampling a gas to be tested, a flow dividing unit 4, an oxygen scavenging unit 5, and a column unit 6. a detecting unit 7, a first pressure controller 81, a second pressure controller 82, and a flow assisting device 83 provided with a carrier gas. In this embodiment, the sample selecting unit 3 is eight points. A sampler for sampling different gases to be tested.

The shunt unit 4 includes a first shunt 41 that communicates the sample selection unit 3 with the first pressure controller 81, a second shunt 42 that communicates with the first shunt 41, and a second shunt 42 that communicates with the second shunt 42. a third flow divider 43 , wherein the second pressure controller 82 and the flow assist device 83 communicate with the second flow divider 42 , and the first, second, and third flow dividers 41 , 42 , 43 can control the gas to be tested The direction of flow.

The deaerator unit 5 is connected to the second shunt 42 and is used to reduce the concentration of oxygen in the gas to be tested; the column unit 6 includes a communication The first splitter 41 of the first splitter 41 and the third splitter 43 , a second splitter string 62 that communicates with the oxygen scavenging unit 5 , and a third splitter string 63 that communicates with the second splitter 42 . .

The detecting unit 7 has a first detector 71 connected to the third shunt 43 and a second detector 72 connected to the second separating column 62. The first and second detectors 71, 72 is capable of detecting the concentration of the substance of the gas to be tested.

Referring to FIG. 3, the gas analysis method of the present invention performs an analysis operation by using the gas analysis device described above. The gas analysis method includes a sampling step 201, a first type analysis step 202, a second type analysis step 203, and a A third type of analysis step 204.

Referring to FIGS. 2 and 3, the sampling step 201 is to first sample a gas to be tested by using the sample selection unit 3, and fill the gas to be tested into the first shunt 41 in a closed state, and the second shunt in a closed state. In the middle of the device 42.

Referring to FIG. 3 and FIG. 4, the first type of analysis step 202 is to first turn on the first shunt 41, so that the gas to be tested in the first shunt 41 flows through the first separation column 61 in an open state. The third flow divider 43 and the first detector 71, wherein the first separation column 61 separates the gas to be tested into a first type of substance, such as Xe, CO ₂ , C ₂ H ₆ , and C ₂ H ₂ or the like, and performing concentration detection on the first type of substance through the first detector 71.

Referring to FIGS. 3 and 5, the second type of analysis step 203 is to first turn on the second shunt 42 and turn off the first and third shunts 41 and 43 to sequentially flow the gas to be tested in the second shunt 42. The deaerator unit 5, the second separation column 62, and a second detector 72, wherein the oxygen scavenging unit 5 reduces the concentration of the gas to be tested, and the second separation column 62 will The gas to be tested separates a second type of substance, such as Ar, N ₂ , Kr, CH _{4 ,} etc., and the second type of substance is subjected to concentration detection by the second detector 72.

Referring to FIGS. 3 and 6, the third type of analysis step 204 is to first close the first, second, and third shunts 41, 42, and 43 so that the gas to be tested in the second shunt 42 flows through the third. Separating the column 63 and the first detector 71, wherein the third separation column 63 separates the gas to be tested into a third type of substance, such as N ₂ O, C ₂ H _m , C ₃ H _m And C ₄ H _m or the like, wherein m is a positive integer, and concentration detection is performed on the third type of substance through the first detector 71.

It is to be noted that the first and second pressure controllers 81, 82 are arranged to respectively adjust the internal pressures of the first and second diverters 41, 42 to enable the gas to be tested to be smoothly in the first The flow divider assistor 83 is configured to supply a carrier gas (helium gas) to assist the flow of the gas to be tested in the third flow divider 43.

In summary, the first, second, and third shunts 41, 42, 43 are switched to an open or closed state at different time periods, so that the gas to be tested can flow through the first, second, and third separation columns. 61, 62, 63 separate three different substances, and use the first and second detectors 71, 72 to detect the concentration of the substance, thereby measuring a plurality of gases to be tested The concentration of different substances can not only achieve the effect of detecting multiple substances in one sampling, but also reduce the cost by simplifying the analysis work, so the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

201‧‧‧Sampling steps

202‧‧‧First type of analysis steps

203‧‧‧Second analysis steps

204‧‧‧The third type of analysis steps

3‧‧‧Selection unit

4‧‧‧Splitting unit

41‧‧‧First shunt

42‧‧‧Second shunt

43‧‧‧ Third shunt

5‧‧‧Deoxygenation unit

6‧‧‧Pipe unit

61‧‧‧First separation column

62‧‧‧Second separation column

63‧‧‧The third separation column

7‧‧‧Detection unit

71‧‧‧First detector

72‧‧‧Second detector

81‧‧‧First pressure controller

82‧‧‧Second pressure controller

83‧‧‧Flow aids

1 is a block diagram showing a preferred embodiment of the gas analysis device of the present invention; FIG. 2 is a schematic view showing the preferred embodiment of the sampling step; FIG. 3 is a flow chart illustrating the present invention. A preferred embodiment of the gas analysis method; FIG. 4 is a schematic view showing the preferred embodiment of the first type of analysis step; FIG. 5 is a schematic view showing the preferred embodiment of the second type of analysis step. FIG. 6 is a schematic diagram showing the aspect of the preferred embodiment in the third type of analysis step.

3. . . Sample selection unit

4. . . Shunt unit

41. . . First shunt

42. . . Second shunt

43. . . Third shunt

5. . . Deaerator unit

6. . . Column unit

61. . . First separation column

62. . . Second separation column

63. . . Third separation column

7. . . Detection unit

71. . . First detector

72. . . Second detector

81. . . First pressure controller

82. . . Second pressure controller

83. . . Traffic aid

Claims (7)

A gas analysis method comprises: a sampling step of sampling a gas to be tested, and filling the gas to be tested into a first shunt in a closed state, and a second shunt in a closed state; In the analyzing step, the first shunt is turned on, so that the gas to be tested in the first shunt flows sequentially through a first separation pipe column, a third flow divider in an open state, and a first detector. Wherein, the first separation column separates the gas to be tested into a first type of substance, and performs concentration detection on the first type of substance through the first detector; and a second type of analysis step, opening the The second flow divider closes the first and third flow dividers, so that the gas to be tested in the second flow divider sequentially flows through an oxygen removal unit, a second separation tube column, and a second detector, wherein The deaerator unit reduces the concentration of the gas to be tested, and the second separation column separates the gas to be tested into a second type of substance, and the second type of substance is subjected to the second detector. Concentration detection; and a third type of analysis step, closing the first, second, a flow divider, the gas to be tested in the second flow divider sequentially flows through a third separation pipe column and the first detector, wherein the third separation pipe column separates the gas to be tested Three types of substances, and the concentration detection of the third type of substance through the first detector. The gas analysis method according to claim 1, wherein the first substance is Xe, CO ₂ , C ₂ H ₆ , and C ₂ H ₂ , and the second substance is Ar, N ₂ , Kr And CH ₄ , the third type of substance is N ₂ O, C ₂ H _m , C ₃ H _m , C ₄ H _m , wherein m is a positive integer. According to the gas analysis method of claim 1, in the sampling step, the first flow divider is connected to a first pressure controller, the second flow divider is connected to a second pressure controller, and one is provided A flow aid for the carrier gas. A gas analysis device comprises: a sample selection unit for sampling a gas to be tested; a flow dividing unit comprising a first flow divider connected to the sample selection unit and a second flow divider connected to the first flow divider, And a third flow divider connected to the second flow divider, wherein the first, second, and third diverters can control a flow direction of the gas to be tested; an oxygen removal unit is connected to the second flow divider and configured to reduce The concentration of oxygen in the gas to be tested; a column unit comprising a first separation column connecting the first splitter and the third splitter, a second separation column connected to the deaerator unit, and a communication a third separation pipe of the second flow divider; and a detection unit having a first detector connected to the third flow divider and a second detector connected to the second separation pipe string, wherein The first and second detectors are capable of detecting the concentration of the substance of the gas to be tested. The gas analysis device according to claim 4, wherein the first separation column is capable of performing separation operations of Xe, CO ₂ , C ₂ H ₆ , and C ₂ H ₂ , and the second separation column can The separation operation of Ar, N ₂ , Kr, and CH ₄ is performed, and the third separation column can perform N ₂ O, C ₂ H _m , C ₃ H _m , and C ₄ H _m separation operations, where m is a positive integer. The gas analysis device according to claim 4, further comprising a first pressure controller connected to the first flow divider and a second pressure controller connected to the second flow divider. The gas analysis device according to claim 4, further comprising a flow assist device that communicates with the second flow divider of the flow dividing unit and provides a carrier gas.