CN219532640U - CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement - Google Patents
CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement Download PDFInfo
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- CN219532640U CN219532640U CN202320257417.0U CN202320257417U CN219532640U CN 219532640 U CN219532640 U CN 219532640U CN 202320257417 U CN202320257417 U CN 202320257417U CN 219532640 U CN219532640 U CN 219532640U
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Abstract
The utility model discloses a CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement, which at least comprises a sampling probe rod, a heater, a filter element, a hygrometer, an oxygen meter, a probe housing, a heat tracing pipeline connector, a mounting flange and a heating controller; the heater is of a cylindrical structure, is connected with the heating controller and is controlled by the heating controller; one end of the sampling probe rod is a sampling port, and the other end of the sampling probe rod is communicated with the heater; the filter element is arranged on the sampling probe rod; the sensing heads of the hygrometer and the oxygen meter sensing component extend into the heater; the heater is arranged in the probe housing, the heat tracing pipeline connector is arranged on the heater, and the probe housing is provided with a sample gas interface; the mounting flange is arranged on the probe housing, and the sampling port of the sampling probe rod extends into the inner side of the flue, the chimney or the exhaust barrel. The utility model realizes the self-checking of CEMS sampling air tightness, is simple and accurate, and is easy to reform.
Description
Technical Field
The utility model relates to a CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement, belonging to the technical field of industrial gas component sampling measurement.
Background
In modern industrial production, it is inevitable to discharge or release pollutants to the atmosphere, and a large amount of the pollutants are discharged in an organized manner through a flue, a chimney or an exhaust funnel. In order to calculate the total pollutant emission, related devices such as flue gas flow and flue gas pollutant concentration measurement are generally installed on a flue, a chimney or an exhaust drum.
CEMS is an abbreviation of Continuous Emission Monitoring System, and refers to a device for continuously monitoring the concentration and total emission amount of gaseous pollutants and particulate matters emitted from an atmospheric pollution source and transmitting information to a authorities in real time, which is called a "smoke automatic monitoring system", also called a "smoke emission continuous monitoring system" or a "smoke on-line monitoring system". The CEMS is respectively composed of a gaseous pollutant monitoring subsystem, a particulate matter monitoring subsystem, a smoke parameter monitoring subsystem and a data acquisition processing and communication subsystem. The gaseous pollutant monitoring subsystem is mainly used for monitoring gaseous pollutant SO 2 、NOx、CO 2 Concentration and total emissions of the like; the particle monitoring subsystem is mainly used for monitoring the concentration and the total emission amount of smoke; the smoke parameter monitoring subsystem is mainly used for measuring smoke flow rate, smoke temperature, smoke pressure, smoke oxygen content, smoke humidity and the like, and is used for integrating total emission and converting related concentration; the data acquisition processing and communication subsystem is composed of a data acquisition device and a computer system, acquires various parameters in real time, generates dry bases, wet bases and converted concentrations corresponding to various concentration values, generates cumulative emission of days, months and years, completes compensation of lost data and transmits a report to a main department in real time. Smoke and dust test by cross flue opacity dust meterBeta-ray dust meters have evolved to plug-in back-scattered infrared or laser dust meters, front scatter, side scatter, electrical dust meters, and the like. CEMS is mainly divided into 3 technologies of direct measurement, extraction measurement and remote sensing measurement according to different sampling modes.
At present, china is used for monitoring gaseous pollutant SO 2 、NOx、CO 2 CEMS of equal concentration is mostly a removable measurement. The directly-extracted CEMS is characterized in that the smoke passes through a front-end filter element, a sampling tube with a heating and heat-preserving device for preventing water in the smoke from condensing in a pipeline and an air duct, the integral temperature is controlled at 120-220 ℃, the water in the smoke is removed by condensation before the smoke enters an analyzer, and then the measured CEMS is carried out, and the concentration of the measured pollutant is the concentration value in a dry basis state. The direct extraction CEMS generally comprises a pretreatment sampling probe, a heat tracing pipeline, a measurement control cabinet and the like, wherein various gas analyzers and condensation water removal devices are arranged in the measurement control cabinet according to the needs, and the gas analyzers generally at least comprise O for converting the concentration of pollutants under the reference oxygen 2 A concentration analyzer; the whole system adopts a negative pressure sampling mode, if air leaks in the sampling process, the monitored gaseous pollutant SO can be caused 2 、NOx、CO 2 The lower the equiconcentration value, the less the calculated total amount of contaminants, although the specific concentration value of the contaminants at a certain reference oxygen level is not affected.
In the technical field of carbon emission monitoring, accurate measurement of flue gas flow and flue gas CO is required 2 The concentration and the concentration are multiplied to be the total carbon emission, if the CEMS sampling system leaks air to cause CO in the flue gas 2 A lower concentration measurement may further result in a smaller total amount of carbon emissions being metered, thereby affecting fairness of the carbon emissions trade. For negative pressure sampling systems, the problem of air leakage may be very common, and the air leakage is difficult to detect when the air leakage is small, so that development of a technology capable of judging whether a CEMS sampling system leaks trace air or not on line in real time is urgently needed.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement, which is used for judging whether a CEMS sampling system leaks air on line in real time by carrying out homologous monitoring and comparison on dry basis oxygen concentrations at the front end and the rear end of CEMS sampling, and solves the technical problem of inaccurate total carbon emission accounting caused by air leakage in the sampling to measuring process in the technical field of carbon emission monitoring.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
the CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement is arranged on a flange sleeve on a flue, a chimney or an exhaust barrel and at least comprises a sampling probe rod, a heater, a filter element, a hygrometer, an oxygen meter, a probe housing, a heat tracing pipeline connector, a sample gas connector, a mounting flange and a heating controller;
the heater is of a cylindrical structure, is connected with the heating controller and is controlled by the heating controller; one end of the sampling probe rod is a sampling port, and the other end of the sampling probe rod is communicated with the heater; the filter element is arranged on the sampling probe rod; the hygrometer and the oxygen meter comprise a sensing part and a signal conversion output part which are connected with each other, a sensing head of the sensing part of the hygrometer and a sensing head of the sensing part of the oxygen meter extend into the inner side of the heater, and the signal conversion output part of the hygrometer and the signal conversion output part of the oxygen meter are positioned outside the heater; the heater is arranged in the probe housing, the heat tracing pipeline connector is arranged on the heater and communicated with the inner side of the heater, and the sample gas connector is arranged on the probe housing; the mounting flange is arranged on the probe housing, the mounting flange is connected with a flange sleeve on the flue, the chimney or the exhaust barrel, a sampling port of the sampling probe rod extends into the inner side of the flue, the chimney or the exhaust barrel, and the probe housing is positioned outside the flue, the chimney or the exhaust barrel.
When in use, the heat tracing pipeline extends into the probe housing from the sample gas connector and is communicated with the heat tracing pipeline connector on the heater.
The other end of the sampling probe rod is communicated with the heater, namely, a sampling channel at the inner side of the sampling probe rod is communicated with the inner side of the heater, and a sampling flow of the sampling probe rod flows into the inner side of the heater to be heated.
The heat tracing pipeline connector and the sample gas connector are arranged oppositely, so that the connection of the heat tracing pipeline is facilitated.
The heating controller controls the temperature of the heater to be between 100 and 280 ℃. Preferably, the heating controller controls the temperature of the heater to be between 120 and 180 ℃. The control technology of the heater by the heating controller, etc. can be directly referred to the prior art, and the utility model has no special improvement, so that the description is omitted.
In order to facilitate installation, save space and improve protection effect, the device further comprises a probe electric control cabinet, wherein the probe electric control cabinet is arranged outside the flue, the chimney or the exhaust funnel and is arranged side by side with the probe housing, and the signal conversion output part of the heating controller and/or the hygrometer and the signal conversion output part of the oxygen meter are arranged in the probe electric control cabinet.
The applicant finds that the pretreatment sampling probe, the heat tracing pipeline and the measurement control cabinet of the direct extraction type flue gas CEMS are sequentially connected, and the flue gas sample obtained by the pretreatment sampling probe enters the measurement control cabinet for analysis and measurement after passing through the heat tracing pipeline; the junction at the two ends of the heat tracing pipeline is easy to leak air, and small holes or cracks can exist on the heat tracing pipeline to cause air leakage, so that the arrangement in the measurement control cabinet is complex, and the possibility of air leakage at a plurality of places is also provided. Because the oxygen concentration measured in the measurement control cabinet is the dry-basis oxygen concentration after condensation and water removal, the utility model arranges the oxygen meter and the hygrometer in the CEMS pretreatment sampling probe at the same time, the oxygen measured by the oxygen meter in the pretreatment probe can be converted into the dry-basis oxygen concentration at the pretreatment probe through the hygrometer measured value, and compared with the oxygen measured by the oxygen measurement after condensation and water removal in the measurement control cabinet, when the absolute value comparison deviation exceeds +/-0.5%, the air leakage point of the CEMS sampling analysis system can be identified, thereby judging whether the CEMS sampling system leaks air or not on line in real time.
The oxygen measuring point in the pretreatment probe and the oxygen measuring point in the measurement control cabinet belong to homologous monitoring, and whether the sampling system has air leakage or not can be reflected in real time through the difference of the oxygen measuring point and the oxygen measuring point, so that the self-detection of the air tightness of the CEMS sampling system is realized, the method is simple and accurate, and the technical problem of inaccurate carbon emission calculation caused by air leakage in the sampling to measurement process is solved.
In order to prolong the service life of the filter element, the filter element is preferably arranged at one end of the sampling probe rod connected with the heater, and the filter element is surrounded by the heater, namely, the filter element part extends into the inner side of the heater, so that the filter element can be effectively prevented from being corroded by low temperature.
It is further preferred that the filter cartridge is mounted upstream of the hygrometer and the oxygen meter inside the heater, which is advantageous for extending the service life of the hygrometer and the oxygen meter.
To ensure that the CEMS heat trace line does not have a cold spot, it is preferred that the heat trace line connector be recessed within the probe housing.
In order to reduce the cost and improve the system integration level, the hygrometer and the oxygen meter are integrally designed to form the wet oxygen concentration meter.
The sampling probe rod is a metal round tube with DN 10-DN 25, and the mounting flange is a standard flange with DN50-DN 150.
The filter element is a metal sintered ceramic filter element, the temperature resistance is not lower than 300 ℃, and the filtering precision is not lower than 50 mu m.
The upper limit of the range of the hygrometer is not less than 15% VOL, and the upper limit of the range of the oxygen meter is not less than 20% VOL.
The signal conversion output part of the hygrometer and the signal conversion output part of the oxygen meter are arranged outside the flue, the chimney or the exhaust funnel and outside the probe housing.
The technology not mentioned in the present utility model refers to the prior art.
According to the CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement, the dry base oxygen concentration at the front end of CEMS sampling can be obtained by improving the CEMS pretreatment sampling probe structure, and whether the CEMS sampling system leaks air or not is judged in real time on line by comparing with a test value in a measurement control cabinet, so that self-checking of CEMS sampling air tightness is realized, simplicity and accuracy are realized, and the technical problem of inaccurate carbon emission calculation caused by air leakage in the sampling to measurement process is solved; simple structure, easy transformation.
Drawings
FIG. 1 is a schematic structural diagram of a CEMS pretreatment sampling probe structure of the present utility model integrating humidity and oxygen concentration measurements;
in the figure, 1 is a sampling probe rod, 2 is a heater, 3 is a filter element, 4 is a sensing component of a hygrometer, 5 is a sensing component of an oxygen meter, 6 is a probe housing, 7 is a sample gas interface, 8 is a heat tracing pipeline connector, 9 is a mounting flange, 10 is a signal conversion output component of the hygrometer and the oxygen meter, and 11 is a probe electric control cabinet.
Detailed Description
For a better understanding of the present utility model, the following examples are further illustrated, but are not limited to the following examples.
Example 1
As shown in FIG. 1, the CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement is arranged on a flange sleeve on a flue, a chimney or an exhaust barrel and at least comprises a sampling probe rod, a heater, a filter element, a hygrometer, an oxygen meter, a probe housing, a heat tracing pipeline connector, a sample gas connector, a mounting flange and a heating controller;
the heater is of a cylindrical structure, is connected with the heating controller and is controlled by the heating controller; one end of the sampling probe rod is a sampling port, and the other end of the sampling probe rod is communicated with the heater; the filter element is arranged on the sampling probe rod; the hygrometer and the oxygen meter comprise a sensing part and a signal conversion output part which are connected with each other, a sensing head of the sensing part of the hygrometer and a sensing head of the sensing part of the oxygen meter extend into the heater, the signal conversion output part of the hygrometer and the signal conversion output part of the oxygen meter are positioned outside the heater, and meanwhile, the signal conversion output part of the hygrometer and the signal conversion output part of the oxygen meter are also arranged outside a flue, a chimney or an exhaust funnel and outside a probe housing; the heater is arranged in the probe housing, the heat tracing pipeline connector is arranged on the heater and communicated with the inner side of the heater, the sample gas connector is arranged on the probe housing, the heat tracing pipeline connector is arranged opposite to the sample gas connector, and the heat tracing pipeline extends into the probe housing from the sample gas connector and is communicated with the heat tracing pipeline connector on the heater; the mounting flange is arranged on the probe housing, the mounting flange is connected with a flange sleeve on the flue, the chimney or the exhaust barrel, a sampling port of the sampling probe rod extends into the inner side of the flue, the chimney or the exhaust barrel, and the probe housing is positioned outside the flue, the chimney or the exhaust barrel.
The heating controller controls the temperature of the heater to be 120-180 ℃.
In practice, a pretreatment sampling probe of the direct extraction type flue gas CEMS, a heat tracing pipeline and a measurement control cabinet are sequentially connected, and a flue gas sample obtained by the pretreatment sampling probe enters the measurement control cabinet for analysis and measurement after passing through the heat tracing pipeline; the junction at the two ends of the heat tracing pipeline is easy to leak air, and small holes or cracks can exist on the heat tracing pipeline to cause air leakage, so that the arrangement in the measurement control cabinet is complex, and the possibility of air leakage at a plurality of places is also provided. Because the oxygen concentration measured in the measurement control cabinet is the dry-basis oxygen concentration after condensation and water removal, the oxygen meter and the hygrometer are simultaneously arranged in the CEMS pretreatment sampling probe, the oxygen measured by the oxygen meter in the pretreatment probe can be converted into the dry-basis oxygen concentration at the pretreatment probe through the hygrometer measured value, and compared with the oxygen measured by the oxygen measurement after condensation and water removal in the measurement control cabinet, when the absolute value comparison deviation exceeds +/-0.5%, the air leakage point of the CEMS sampling analysis system can be identified, so that whether the CEMS sampling system leaks air or not can be judged on line in real time.
The oxygen measuring point in the pretreatment probe and the oxygen measuring point in the measurement control cabinet belong to homologous monitoring, whether the sampling system has air leakage problem or not can be detected in real time through the difference of the oxygen measuring point and the oxygen measuring point, the self-detection of CEMS sampling air tightness is realized, the method is simple and accurate, and the technical problem of inaccurate carbon emission calculation caused by air leakage in the sampling to measurement process is solved.
Example 2
On the basis of example 1, the following modifications were further made: in order to improve service life, the filter core is installed on the sampling probe rod and is connected with the one end of heater, and the filter core is surrounded by the heater. That is, the filter element part is extended into the inner side of the heater, so that the filter element can be effectively prevented from being corroded by low temperature. The filter cartridge is mounted upstream of the hygrometer and the oxygen meter.
Example 3
On the basis of example 2, the following modifications were further made: as shown in FIG. 1, the device also comprises a probe electric control cabinet, wherein the probe electric control cabinet is arranged outside the flue, the chimney or the exhaust funnel and is arranged side by side with the probe housing, and the heating controller is arranged in the probe electric control cabinet.
Example 4
On the basis of example 3, the following modifications were further made: in order to reduce the cost and improve the system integration level, the hygrometer and the oxygen meter are integrally designed to form the wet oxygen concentration meter. The sampling probe rod is a metal round tube with DN 10-DN 25, and the mounting flange is a standard flange with DN50-DN 150. The filter element is a metal sintered ceramic filter element, the temperature resistance is not lower than 300 ℃, and the filtering precision is not lower than 50 mu m. The upper limit of the range of the hygrometer is not less than 15% VOL, and the upper limit of the range of the oxygen meter is not less than 20% VOL.
Claims (9)
1. CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement is arranged on a flange sleeve on a flue, a chimney or an exhaust barrel, and is characterized in that: the device at least comprises a sampling probe rod (1), a heater (2), a filter element (3), a hygrometer, an oxygen meter, a probe housing (6), a heat tracing pipeline joint (8), a sample gas interface (7), a mounting flange (9) and a heating controller;
the heater (2) is of a cylindrical structure, and the heater (2) is connected with and controlled by the heating controller; one end of the sampling probe rod (1) is a sampling port, and the other end is communicated with the heater (2); the filter element (3) is arranged on the sampling probe rod (1); the hygrometer and the oxygen meter comprise a sensing part and a signal conversion output part which are connected with each other, a sensing head of the hygrometer sensing part (4) and a sensing head of the oxygen meter sensing part (5) extend into the inner side of the heater (2), and the signal conversion output part of the hygrometer and the signal conversion output part (10) of the oxygen meter are positioned outside the heater (2); the heater (2) is arranged in the probe housing (6), the heat tracing pipeline joint (8) is arranged on the heater (2) and communicated with the inner side of the heater (2), and the sample gas interface (7) is arranged on the probe housing (6); the mounting flange (9) is arranged on the probe housing (6), the mounting flange (9) is connected with a flange sleeve on the flue, the chimney or the exhaust barrel, a sampling port of the sampling probe rod (1) extends into the inner side of the flue, the chimney or the exhaust barrel, and the probe housing (6) is positioned outside the flue, the chimney or the exhaust barrel.
2. The CEMS pretreatment sampling probe structure of integrated moisture and oxygen concentration measurement of claim 1, wherein: the filter element (3) is arranged at one end of the sampling probe rod (1) connected with the heater (2), and the filter element (3) is surrounded by the heater (2).
3. The CEMS pretreatment sampling probe structure of integrated humidity and oxygen concentration measurement of claim 2, wherein: the filter element (3) is installed upstream of the hygrometer and the oxygen meter.
4. A CEMS pretreatment sampling probe structure for integrated moisture and oxygen concentration measurement according to any one of claims 1-3, wherein: the heat tracing pipeline joint (8) is arranged opposite to the sample gas joint (7).
5. A CEMS pretreatment sampling probe structure for integrated moisture and oxygen concentration measurement according to any one of claims 1-3, wherein: the hygrometer and the oxygen meter are integrally designed to form the wet oxygen concentration meter.
6. A CEMS pretreatment sampling probe structure for integrated moisture and oxygen concentration measurement according to any one of claims 1-3, wherein: the sampling probe rod (1) is a metal round tube with DN 10-DN 25, and the mounting flange (9) is a standard flange with DN50-DN 150.
7. A CEMS pretreatment sampling probe structure for integrated moisture and oxygen concentration measurement according to any one of claims 1-3, wherein: the filter element (3) is a metal sintering ceramic filter element, the temperature resistance is not lower than 300 ℃, and the filtering precision is not lower than 50 mu m.
8. A CEMS pretreatment sampling probe structure for integrated moisture and oxygen concentration measurement according to any one of claims 1-3, wherein: the upper limit of the measuring range of the hygrometer is not less than 15 percent of VOL, and the upper limit of the measuring range of the oxygen meter is not less than 20 percent of VOL; the signal conversion output component of the hygrometer and the signal conversion output component of the oxygen meter are arranged outside the flue, the chimney or the exhaust funnel and outside the probe housing (6).
9. A CEMS pretreatment sampling probe structure for integrated moisture and oxygen concentration measurement according to any one of claims 1-3, wherein: the device also comprises a probe electric control cabinet (11), wherein the probe electric control cabinet (11) is arranged outside the flue, the chimney or the exhaust funnel and is arranged side by side with the probe housing (6), and the signal conversion output part of the heating controller and/or the hygrometer and the signal conversion output part (10) of the oxygen meter are arranged in the probe electric control cabinet (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320257417.0U CN219532640U (en) | 2023-02-20 | 2023-02-20 | CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement |
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| CN202320257417.0U CN219532640U (en) | 2023-02-20 | 2023-02-20 | CEMS pretreatment sampling probe structure integrating humidity and oxygen concentration measurement |
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