CN112014520A - Exhaust gas measuring device - Google Patents
Exhaust gas measuring device Download PDFInfo
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- CN112014520A CN112014520A CN201911369058.2A CN201911369058A CN112014520A CN 112014520 A CN112014520 A CN 112014520A CN 201911369058 A CN201911369058 A CN 201911369058A CN 112014520 A CN112014520 A CN 112014520A
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- space
- sample gas
- discharge port
- dust
- dust removing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The exhaust gas measuring apparatus according to the present invention can eliminate the presence of sulfuric acid in the flow path of a sample gas, and includes: a sample gas introduction unit for introducing a sample gas; a pretreatment unit for pretreating the introduced sample gas; an analysis unit for analyzing the sample gas subjected to the pretreatment; the pretreatment unit includes a dust removing device for removing dust in the sample gas, and the dust removing device includes: a housing having an interior space; a dust removing filter disposed in the inner space of the housing, separating the inner space into a first space and a second space; a sample gas inlet which is communicated with the upper part of the first space and enables the introduced sample gas to flow into the first space; a sample gas outlet which is communicated with the upper part of the second space and enables the sample gas passing through the dust removal filter to flow out of the shell; a first discharge port discharging the liquid in the first space; a second discharge port which discharges the liquid in the second space; and an opening/closing mechanism for opening/closing the first discharge port.
Description
Technical Field
The present invention relates to an exhaust gas measuring apparatus.
Background
There is an exhaust gas measuring device that measures the concentration of a multicomponent concentration in a combustion exhaust gas (see patent document 1). Such an exhaust gas measuring apparatus is generally provided with a pretreatment unit for removing dust and moisture in a sample gas.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 5-281186
Disclosure of Invention
Technical problem to be solved by the invention
The presence of SO in the sample gas introduced into the exhaust gas measuring device3In many cases, if SO3Becomes sulfuric acid (H) when combined with moisture in the sample gas2SO4). Since the boiling point of sulfuric acid is high, the sulfuric acid becomes mist in the exhaust gas measuring device (hereinafter, the mist sulfuric acid is referred to as sulfuric acid mist). When the sulfuric acid mist flows into an analysis portion for measuring the concentration of the component in the sample gas, an electrode provided in the analysis portion is corroded. Therefore, it is necessary to provide a portion before the analysis section with a function of removing the sulfuric acid mist from the sample gas.
The function of removing the sulfuric acid mist from the sample gas may be provided in a dust removing device for removing dust in the sample gas. In this case, although an outlet for discharging sulfuric acid removed from the sample gas may be provided at an arbitrary position of the dust removing device, in the structure of the conventional dust removing device, the sulfuric acid may remain in the dust removing device, and in such a case, an acid such as sulfuric acid may be present in the flow path of the sample gas. If an acid such as sulfuric acid is present in the dust removing device, the acid gradually accumulates and flows downstream along with the sample gas, so that there is a risk of corroding the analysis section.
The present invention has been made in view of the above problems, and an object thereof is to eliminate the presence of sulfuric acid in the flow path of the sample gas.
Means for solving the technical problem
The exhaust gas measurement device of the present invention includes: a sample gas introduction unit for introducing a sample gas; a pretreatment unit for pretreating the sample gas introduced by the sample gas introduction unit; an analysis unit configured to analyze the sample gas pretreated by the pretreatment unit, the pretreatment unit including a dust removal device configured to remove dust from the sample gas, the dust removal device including: a housing having an interior space; a cylindrical dust removing filter provided in the internal space of the housing, and separating the internal space into a first space and a second space surrounding an outer periphery of the first space; a sample gas inlet which communicates with an upper part of the first space and through which the sample gas introduced from the sample gas introduction part flows into the first space; a sample gas outlet which is communicated with the upper part of the second space and is used for enabling the sample gas passing through the dust removal filter to flow out of the shell; a first discharge port communicating with a bottom surface of the first space, for discharging the liquid in the first space to the outside of the housing; a second discharge port communicating with a bottom surface of the second space, for discharging the liquid in the second space to the outside of the housing; and an opening/closing mechanism for opening/closing the first discharge port.
The dust removing device is explained here. The sample gas flows into the upper part of the first space through the sample gas inlet, flows into the second space through the dust removal filter, and then flows out of the dust removal device through the sample gas outlet. When the sample gas passes through the dust removal filter, dust in the sample gas is captured by the dust removal filter. The gas component in the sample gas flowing into the first space is discharged from the sample gas outlet communicating with the upper portion of the second space to the outside of the second space, while the mist of sulfuric acid mixed in the sample gas falls downward by gravity and is separated from the gas component. Thereby, the sulfuric acid mist is removed from the sample gas in the dust removing device. Most of the sulfuric acid mist mixed in the sample gas passes through the dust removing filter together with the sample gas, flows from the first space into the second space, and falls downward. Therefore, the discharge port (second discharge port) is communicated with the bottom surface of the second space in advance, and the liquid (sulfuric acid) in the second space can be discharged to the outside of the housing. On the other hand, a part of the sulfuric acid mist mixed in the sample gas cannot completely pass through the dust removing filter and remains in the first space, and falls down toward the lower portion of the first space due to gravity. In the present invention, the discharge port (first discharge port) is also communicated with the first space, so that the sulfuric acid remaining in the first space as described above can be discharged to the outside of the housing.
Effects of the invention
In the exhaust gas measuring device according to the present invention, the first discharge port communicates with the bottom surface of the first space of the dust removing device, and the second discharge port communicates with the bottom surface of the second space, so that all the sulfuric acid in the internal space of the dust removing device can be discharged to the outside of the dust removing device, and the presence of sulfuric acid in the flow path of the sample gas can be eliminated.
Drawings
Fig. 1 is a schematic configuration diagram showing an embodiment of an exhaust gas measuring apparatus.
Fig. 2 is a schematic configuration cross-sectional view showing the configuration of the dust removing device of this embodiment.
Detailed Description
An embodiment of the exhaust gas measuring apparatus of the present invention will be described below with reference to the accompanying drawings.
As shown in fig. 1, the exhaust gas measuring apparatus includes a sample gas introduction unit 2, a pretreatment unit 4, a pump 6, an analysis unit 8, and a calculation processing device 10.
The pretreatment unit 4 includes a dust removing device 12 and a dehumidifying device 14. The dust removing device 12 is used to remove dust in the sample gas, and the dehumidifying device 14 is used to remove moisture in the sample gas. The dust removing device 12 has a function of removing not only dust in the sample gas but also sulfuric acid mist contained in the sample gas. The structure of the dust removing device 12 will be described later.
The analyzer 8 measures components in the sample gas passing through the pretreatment unit 4. As the analysis section 8, a pair of N-2、SO2、NO、CO、CO2、O2URA-208 (product of Shimadzu corporation) for measuring such various components.
The arithmetic processing device 10 performs arithmetic processing for quantifying the concentration of each component using the measurement data obtained by the analysis unit 8. The arithmetic processing device 10 is realized by a general-purpose personal computer or a dedicated computer.
Fig. 2 shows an example of the structure of the dust removing device 12.
The dust removing device 12 includes a housing 16 including a main body portion 18 and a lid portion 20. The main body 18 is a cylindrical member having an upper opening, and the lid 20 is attached to an upper portion of the main body 18 via a gasket 22 so as to close the opening of the main body 18. A cylindrical dust removal filter 30 is provided inside the main body portion 18 of the housing 16. The internal space 24 of the housing 16 is divided into a first space 26 and a second space 28 by a dust removing filter 30. The first space 26 is a space inside the dust removing filter 30, and the second space 28 is a space between the outer peripheral surface of the dust removing filter 30 and the inner peripheral surface of the body portion 18. As the dust removing filter 30, for example, a membrane filter can be used.
The lid portion 20 is provided with a sample gas inlet 32 for allowing a sample gas to flow into the internal space 24 of the housing 16. The sample gas inlet 32 communicates with the first space 26. A sample gas outlet 34 for allowing the sample gas in the internal space 24 to flow out of the dust removing device 12 is provided in an upper portion of a side surface of the main body 18. A first discharge port 36 and a second discharge port 38 are provided in a lower portion of the body portion 18. The first discharge port 36 communicates with the bottom surface of the first space 26, and the second discharge port 38 communicates with the bottom surface of the second space 28. The first discharge port 36 and the second discharge port 38 are connected to a common three-way switching valve 40 (opening/closing mechanism), and the open/closed states of the first discharge port 36 and the second discharge port 38 can be switched by the three-way switching valve 40. The three-way switching valve 40 may be automatically switched at a predetermined timing by a control device not shown, or may be manually switched at a desired timing by a user.
In the present embodiment, the open/close states of the first discharge port 36 and the second discharge port 38 can be switched by the common three-way switching valve 40, but the present invention is not limited to this, and an open/close valve (switching mechanism) for switching the open/close state of the first discharge port 36 may be provided separately. In this case, an on-off valve for switching the open/close state of the second discharge port 38 may be separately provided or may not be provided. When the on-off valves for switching the open/close state of the first discharge port 36 and/or the second discharge port 38 are provided, the on-off valves may be switched automatically at a predetermined timing by a control device not shown, or may be switched manually at a desired timing by a user.
The sample gas flowing into the first space 26 in the housing 16 from the sample gas inlet 32 flows out of the dust removing device 12 from the sample gas outlet 34 through the dust removing filter 30. When the sample gas passes through the dust removal filter 30, dust is captured by the dust removal filter 30, thereby removing the dust in the sample gas.
In addition, SO present in the sample gas3Combines with water in the sample gas to form sulfuric acid (H)2SO4). The sample gas is heated to a high temperature before flowing into the dust removing device 12, and sulfuric acid having a high boiling point flows into the dust removing device 12 in the form of mist. The sulfuric acid mist flowing into the dust removing device 12 falls downward by gravity in the first space 26 and the second space 28, and accumulates at the bottom of the first space 26 and the second space 28, respectively. The sulfuric acid accumulated in the bottom of the first space 26 can be discharged to the outside of the dust removing device 12 by opening the first discharge port 36, and the sulfuric acid accumulated in the bottom of the second space 28 can be discharged to the outside of the dust removing device 12 by opening the second discharge port 38.
Further, a suction pump for sucking the liquid in the first space 26 through the first discharge port 36 and sucking the liquid in the second space 28 through the second discharge port 38 may be provided in the flow path on the downstream side of the three-way switching valve 40. By providing such a suction pump, the sulfuric acid in the first space 26 and the second space 28 can be more reliably discharged to the outside of the dust removing device 12.
As described above, in the exhaust gas measuring apparatus of this embodiment, the dust removing device 12 for removing dust in the sample gas has a function of removing sulfuric acid mist, and the sulfuric acid accumulated in the internal space 24 of the dust removing device 12 can be discharged to the outside of the dust removing device 12 by opening the first discharge port 36 and the second discharge port 38, so that the presence of sulfuric acid in the flow path of the sample gas can be eliminated.
The above-described embodiments are merely examples of the embodiment of the exhaust gas measuring device of the present invention. Embodiments of the exhaust gas measuring apparatus of the present invention are as follows.
In an embodiment of the exhaust gas measurement device according to the present invention, the exhaust gas measurement device includes: a sample gas introduction unit for introducing a sample gas; a pretreatment unit for pretreating the sample gas introduced by the sample gas introduction unit; an analysis unit configured to analyze the sample gas pretreated by the pretreatment unit, the pretreatment unit including a dust removal device configured to remove dust from the sample gas, the dust removal device including: a housing having an interior space; a cylindrical dust removing filter provided in the internal space of the housing, and separating the internal space into a first space and a second space surrounding an outer periphery of the first space; a sample gas inlet which communicates with an upper part of the first space and through which the sample gas introduced from the sample gas introduction part flows into the first space; a sample gas outlet which is communicated with the upper part of the second space and is used for enabling the sample gas passing through the dust removal filter to flow out of the shell; a first discharge port communicating with a bottom surface of the first space, for discharging the liquid in the first space to the outside of the housing; a second discharge port communicating with a bottom surface of the second space, for discharging the liquid in the second space to the outside of the housing; and an opening/closing mechanism for opening/closing the first discharge port.
In the first aspect of the above-described embodiment of the exhaust gas measuring device according to the present invention, the opening/closing mechanism is a three-way switching valve for switching to any one of the following states: a state of opening the first discharge port and closing the second discharge port, and a state of closing the first discharge port and opening the second discharge port. According to this configuration, the structure of the opening/closing mechanism can be simplified.
In a second aspect of the above-described embodiment of the exhaust gas measuring apparatus according to the present invention, the dust removing device includes a suction pump for sucking the liquid in the first space through the first discharge port and sucking the liquid in the second space through the second discharge port. According to this configuration, the liquid in the first space and the liquid in the second space can be more reliably discharged to the outside of the dust removing device 12.
In the third aspect of the above-described embodiment of the exhaust gas measuring apparatus according to the present invention, the preprocessing unit includes a dehumidifying device for dehumidifying the sample gas flowing out from the sample gas outlet of the dust removing device. This makes it possible to provide the pretreatment unit with a function of removing dust, sulfuric acid mist, and moisture in the sample gas.
The first to third aspects described above may be freely combined with each other.
Description of the reference numerals
2 sample gas introduction part
4 pretreatment part
6 Pump
8 analysis section
10 arithmetic processing device
12 dust removing device
14 dehumidifying device
16 casing
18 main body part
20 cover part
22 shim
24 inner space
26 first space
28 second space
30 dust removing filter
32 sample gas inlet
34 sample gas outlet
36 first discharge port
38 second discharge port
A 40 three-way switching valve (switching mechanism).
Claims (5)
1. An exhaust gas measurement device is characterized by comprising:
a sample gas introduction unit for introducing a sample gas;
a pretreatment unit for pretreating the sample gas introduced by the sample gas introduction unit;
an analysis unit configured to analyze the sample gas pretreated by the pretreatment unit,
the pretreatment part comprises a dust removal device for removing dust in the sample gas,
the dust removing device is provided with:
a housing having an interior space;
a cylindrical dust removing filter provided in the internal space of the housing, and separating the internal space into a first space and a second space surrounding an outer periphery of the first space;
a sample gas inlet which communicates with an upper part of the first space and through which the sample gas introduced from the sample gas introduction part flows into the first space;
a sample gas outlet which is communicated with the upper part of the second space and is used for enabling the sample gas passing through the dust removal filter to flow out of the shell;
a first discharge port communicating with a bottom surface of the first space, for discharging the liquid in the first space to the outside of the housing;
a second discharge port communicating with a bottom surface of the second space, for discharging the liquid in the second space to the outside of the housing;
and an opening/closing mechanism for opening/closing the first discharge port.
2. The exhaust gas measuring apparatus according to claim 1,
the opening and closing mechanism is a three-way switching valve and is used for switching to any one of the following states: a state of opening the first discharge port and closing the second discharge port, and a state of closing the first discharge port and opening the second discharge port.
3. The exhaust gas measuring apparatus according to claim 1,
the dust removing device includes a suction pump for sucking the liquid in the first space through the first discharge port and sucking the liquid in the second space through the second discharge port.
4. The exhaust gas measuring apparatus according to claim 2,
the dust removing device includes a suction pump for sucking the liquid in the first space through the first discharge port and sucking the liquid in the second space through the second discharge port.
5. The exhaust gas measuring apparatus according to any one of claims 1 to 4,
the pretreatment unit includes a dehumidifier for dehumidifying the sample gas flowing out from the sample gas outlet of the dust remover.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019101262A JP2020193936A (en) | 2019-05-30 | 2019-05-30 | Exhaust gas measuring device |
| JP2019-101262 | 2019-05-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112014520A true CN112014520A (en) | 2020-12-01 |
| CN112014520B CN112014520B (en) | 2023-09-22 |
Family
ID=73506799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911369058.2A Active CN112014520B (en) | 2019-05-30 | 2019-12-26 | Exhaust gas measuring device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2020193936A (en) |
| CN (1) | CN112014520B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115808335A (en) * | 2022-12-12 | 2023-03-17 | 江苏恩达通用设备集团有限公司 | Portable diesel engine exhaust gas monitoring instrument |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05281186A (en) * | 1992-03-30 | 1993-10-29 | Shimadzu Corp | Combustion exhaust gas measuring device |
| US20040109802A1 (en) * | 2002-12-05 | 2004-06-10 | Meserole Frank B | Process for removing SO3/H2SO4 from flue gases |
| JP2005114700A (en) * | 2003-10-07 | 2005-04-28 | Murata Keisokuki Service Kk | Analysis pretreatment method and device for atmospheric aerosol particle used for pixe analysis |
| CN201969449U (en) * | 2010-12-22 | 2011-09-14 | 居琴 | Deashing and dedusting device |
| CN102580431A (en) * | 2011-04-20 | 2012-07-18 | 庄建中 | Dedusting and dusulfuration integration process for smoke |
| CN203183875U (en) * | 2013-04-17 | 2013-09-11 | 西安同大实业有限公司 | High-efficiency tail gas separator for nitric acid device |
| CN208372737U (en) * | 2018-05-16 | 2019-01-15 | 陕西燎原净化设备有限公司 | A kind of phosphoric acid tail gas purification recovery device |
-
2019
- 2019-05-30 JP JP2019101262A patent/JP2020193936A/en active Pending
- 2019-12-26 CN CN201911369058.2A patent/CN112014520B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05281186A (en) * | 1992-03-30 | 1993-10-29 | Shimadzu Corp | Combustion exhaust gas measuring device |
| US20040109802A1 (en) * | 2002-12-05 | 2004-06-10 | Meserole Frank B | Process for removing SO3/H2SO4 from flue gases |
| JP2005114700A (en) * | 2003-10-07 | 2005-04-28 | Murata Keisokuki Service Kk | Analysis pretreatment method and device for atmospheric aerosol particle used for pixe analysis |
| CN201969449U (en) * | 2010-12-22 | 2011-09-14 | 居琴 | Deashing and dedusting device |
| CN102580431A (en) * | 2011-04-20 | 2012-07-18 | 庄建中 | Dedusting and dusulfuration integration process for smoke |
| CN203183875U (en) * | 2013-04-17 | 2013-09-11 | 西安同大实业有限公司 | High-efficiency tail gas separator for nitric acid device |
| CN208372737U (en) * | 2018-05-16 | 2019-01-15 | 陕西燎原净化设备有限公司 | A kind of phosphoric acid tail gas purification recovery device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115808335A (en) * | 2022-12-12 | 2023-03-17 | 江苏恩达通用设备集团有限公司 | Portable diesel engine exhaust gas monitoring instrument |
| CN115808335B (en) * | 2022-12-12 | 2023-10-20 | 江苏恩达通用设备集团有限公司 | Portable diesel engine waste gas monitor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020193936A (en) | 2020-12-03 |
| CN112014520B (en) | 2023-09-22 |
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