CN209894793U - Online flue gas hygrometer with blowback calibration function - Google Patents
Online flue gas hygrometer with blowback calibration function Download PDFInfo
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- CN209894793U CN209894793U CN201920621430.3U CN201920621430U CN209894793U CN 209894793 U CN209894793 U CN 209894793U CN 201920621430 U CN201920621430 U CN 201920621430U CN 209894793 U CN209894793 U CN 209894793U
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Abstract
The utility model discloses an online flue gas hygrometer with blowback calibration function belongs to online humidity monitoring technical field of flue gas. The probe rod of the on-line flue gas humidity instrument comprises a probe rod tail part and a probe rod probe, wherein the probe rod tail part is connected with the integrated control module, and a calibration cover is arranged outside the probe rod probe; a temperature and humidity sensor is arranged in the calibration cover; the temperature and humidity sensor is electrically connected with the integrated control module, and the integrated control module comprises a calibration controller and a back-blowing controller; a back-blowing calibration gas circuit is arranged in the probe rod, and the air inlet back-blowing calibration port is connected with the calibration cover through the back-blowing calibration gas circuit. The utility model discloses a carry out online blowback calibration to flue gas hygronom, the velocity of flow of flue gas in the flue can be delayed to the calibration cover for flow field in the flue tends to stably, reduces the influence of surrounding environment to flue gas hygronom, and then has improved online flue gas humidity measuring precision and accuracy.
Description
Technical Field
The utility model relates to a flue gas online humidity monitoring technology field, more specifically say, relate to an online flue gas hygrometer with blowback calibration function.
Background
The improvement is open, the industrial development of China has attracted attention, but the atmospheric environment problem brought by the industry is increasingly serious, and the flue gas emission of various combustors, industrial boilers and commercial boilers causes serious atmospheric pollution. An important aspect of current environmental protection work is monitoring toxic and harmful gases in flue gas, and a flue gas on-line continuous monitoring system (CEMS) is also produced. CEMS is mainly used for quantitatively calculating pollutants in flue gas based on the condition of dry flue gas, but the flue gas discharged by industry is not ideal dry flue gas and always contains certain moisture, so the moisture content of the flue gas becomes a necessary measurement factor in monitoring a flue gas pollution source, the measurement accuracy is directly related to the pollutant discharge total amount, the concentration calculation and the efficiency evaluation of a flue gas purification system, and the CEMS has great influence on a flue gas treatment system.
The smoke moisture content is the humidity of the smoke, and comprises two expression forms of absolute humidity and relative humidity of the smoke. The absolute humidity of the flue gas refers to the ratio of the mass of water vapor contained in the flue gas to the mass of the adiabatic dry flue gas. The relative humidity RH of flue gas is defined as the percentage of the humidity of the flue gas to the humidity of saturated wet flue gas at the same temperature. The sources of moisture in the flue gas include the following: the water vapor is formed by the evaporation of the water brought by the fuel in the form of bound water or external water in the combustion process of the fuel; secondly, the water carried by the air blown into the boiler during combustion; and thirdly, water generated by oxidizing hydrocarbons contained in the fuel during combustion.
The flue gas contains certain water, dust and acidic substances such as SO2、NOXAnd when the humidity is measured under the working condition for a long time, the problems that the measurement accuracy is influenced due to the drift of humidity measurement data and the like can occur. Fixed and polluted source flue gas (SO)2NOx and particulate matter) emission continuous monitoring system technical requirement and detection method HJ76-2017, and humidity is usedThe parameters of the smoke must be measured and the total emission amount is calculated, so how to overcome the infection of high temperature, high humidity, high dust and acidic substances and ensure the on-line accurate measurement of the smoke humidity is a problem to be solved urgently.
Through retrieval, a series of improvements are made on the smoke humidity instrument in the prior art, but the improvement is usually limited to the internal structure connection of the smoke humidity instrument and is difficult to break through on the whole. The name of the invention is: an online calibration device of a flue gas hygrometer (application number: 201820725999.X, application date: 2018.05.16) comprises a hygrometer and a chimney, wherein a one-way valve and a first flange are arranged on the hygrometer, the one-way valve is connected inside the hygrometer through threads, the first flange is welded on the outer side of the hygrometer through a pipeline, a second flange and a protective sleeve are arranged on the chimney, the second flange is welded on the outer side of the chimney through a pipeline, the protective sleeve penetrates through the chimney, a sensor main body is placed behind the inner portion of the protective sleeve, and a standard gas channel is connected to the rear end of a calibration gas pipe through a reducer pipe.
In addition, the invention is created as follows: on-line flue gas temperature, humidity, dew point, moisture integration measurement transmitter (application number: 201020156206.0, application date: 2010.04.09), including transmitter, probe rod, probe outer tube, heating rod and probe cover pipe, the one end of probe rod with the transmitter links to each other, the other end of probe rod with the rear end of probe outer tube links to each other, and the afterbody of probe is equipped with the data line, and the afterbody of every heating rod all is equipped with the electric wire, and every heating rod and probe are in all be in independent cavity in the probe outer tube, the probe cover pipe links to each other with the front end of probe outer tube, but the weak point of this application lies in: the instrument is susceptible to corrosion by flue gas, resulting in errors in measured data.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved by the utility model
The utility model provides an on-line flue gas humidity meter with back-blowing calibration function, aiming at the problem that the existing flue gas moisture content measuring instrument is easy to be interfered by the environment and the humidity measurement is not accurate, which stabilizes the flow field of the flue gas in the flue and reduces the influence of the surrounding environment on the flue gas humidity meter by carrying out on-line back-blowing calibration on the flue gas humidity meter; further, the accuracy and precision of online flue gas humidity measurement are improved.
2. Technical scheme
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model discloses an online flue gas hygrometer with a back-blowing calibration function, which comprises a feeler lever, a calibration cover, an integrated control module and an air inlet back-blowing calibration port; the probe rod comprises a probe rod tail part and a probe rod probe, wherein the probe rod tail part is connected with the integrated control module, and a calibration cover is arranged outside the probe rod probe; a temperature and humidity sensor is arranged in the calibration cover; the temperature and humidity sensor is electrically connected with the integrated control module, and the integrated control module comprises a calibration controller and a back-blowing controller; a back-blowing calibration gas circuit is arranged in the probe rod, and the air inlet back-blowing calibration port is connected with the calibration cover through the back-blowing calibration gas circuit.
Preferably, one side of the calibration cover close to the probe rod probe is connected with the probe rod in a sealing mode, and one side of the calibration cover far away from the probe rod probe is provided with a calibration cover opening.
Preferably, an inner cover is arranged in the calibration cover, and the inner cover is arranged outside the probe rod probe in a surrounding mode.
Preferably, the calibration controller comprises a zero potentiometer and a full scale potentiometer, and the zero potentiometer and the full scale potentiometer are respectively and electrically connected with the temperature and humidity sensor through conducting wires.
Preferably, the intake blowback calibration port is electrically connected with a blowback controller of the integrated control module.
Preferably, the blowback gas of the intake blowback calibration port is high-purity nitrogen or compressed air for instruments.
Preferably, the pressure of the blowback gas of the air inlet blowback calibration port is 0.15-0.25 MPa.
Preferably, a filter is arranged at one end of the inner cover far away from the probe, the distance between the end part of the probe and the filter is D1, the distance between the end part of the probe and the opening of the calibration cover is D2, and D1 is less than D2.
Preferably, the calibration cap is cylindrical, or elliptical, or polygonal.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following apparent effect:
(1) the utility model discloses an online flue gas hygrometer with a back-blowing calibration function, which comprises a feeler lever, a calibration cover, an integrated control module and an air inlet back-blowing calibration port; in the embodiment, the sensor is subjected to back flushing periodically, so that the sensor is prevented from being blocked and corroded; meanwhile, the on-line zero point and full scale calibration is realized, and the accuracy and precision of on-line flue gas humidity measurement are ensured;
(2) the utility model discloses an online flue gas hygrometer with blowback calibration function, one side that the calibration cover is close to the probe rod probe is connected with the probe rod sealing, one side that the calibration cover is kept away from the probe rod probe is provided with calibration cover mouth, and still be provided with the inner cover in the calibration cover, make the calibration cover wholly present bilayer, open structure, have better interference killing feature, can delay the velocity of flow of flue gas in the flue, make the flow field in the flue tend to stability, have avoided the impact of flue gas;
(3) the utility model discloses an online flue gas hygrometer with blowback calibration function can carry out online automatic zero calibration and online manual zero point/full linear calibration simultaneously to realize flue gas humidity's online accurate measurement, still can realize flue gas hygrometer and realize long-term online accurate measurement.
Drawings
FIG. 1 is a schematic view of the overall structure of an on-line flue gas humidity meter with blowback calibration function according to the present invention;
FIG. 2 is a schematic view of the internal structure of the calibration cap;
FIG. 3 is a schematic diagram of the structure of a zero-level potentiometer and a full-level potentiometer;
FIG. 4 is a schematic view of the calibration cap;
FIG. 5 is a schematic structural diagram of an on-line flue gas humidity meter with blowback calibration function according to embodiment 2;
fig. 6 is a schematic structural diagram of an online flue gas humidity meter with a blowback calibration function in embodiment 3.
The reference numerals in the schematic drawings illustrate:
100. a probe rod; 110. the tail part of the probe rod; 120. a probe rod probe;
200. a calibration mask; 201. calibrating a cover opening of the cover; 202. an inner cover; 210. a temperature and humidity sensor; 220. a sensor lock head; 230. a filter disc;
300. an integrated control module; 310. a back-flushing controller; 320. calibrating the controller; 330. a zero potentiometer; 340. a full scale potentiometer;
400. an air inlet blowback calibration port; 410. and (5) back blowing the calibration gas circuit.
Detailed Description
For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
The structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention does not have the substantial significance in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like, referred to in the present specification, are used for clarity of description only, and are not used to limit the implementable scope, and changes or adjustments of the relative relationship thereof are also regarded as the implementable scope of the present invention without substantial changes in the technical content; in addition, the embodiments of the present invention are not independent of each other, but can be combined.
Example 1
As shown in fig. 1, the online flue gas humidity meter with blowback calibration function of the present invention comprises a feeler lever 100, a calibration cover 200, an integrated control module 300 and an air inlet blowback calibration port 400; when the flue gas humidity meter of the embodiment measures the flue gas humidity, the sensor is prevented from being blocked and corroded by regularly carrying out back flushing on the sensor; meanwhile, the on-line zero point and full scale calibration is realized, and the accuracy and precision of on-line flue gas humidity measurement are ensured.
The probe 100 of this embodiment is inside to be hollow structure, and the probe 100 includes probe afterbody 110 and probe 120, and wherein probe afterbody 110 is provided with integrated control module 300, and the outside of probe 120 is provided with the external screw thread, is provided with the internal thread with external screw thread matched with on the calibration cover 200, and probe 120 is connected through spiral mode and calibration cover 200. The length of the probe rod 100 of the embodiment can be flexibly adjusted, so that the measurement of flue gas in different environments is facilitated.
One side of the calibration cover 200 close to the probe rod probe 120 is hermetically connected with the probe rod 100, and one side of the calibration cover 200 far away from the probe rod probe 120 is provided with a calibration cover opening 201, so that the whole calibration cover 200 is in a semi-open type; an inner cover 202 is also arranged in the calibration cover 200, and the inner cover 202 is arranged around the probe head 120. The end, far away from the probe rod probe 120, of the inner cover 202 is provided with the filter sheet 230, wherein the distance between the end of the probe rod probe 120 and the filter sheet 230 is D1, the distance between the end of the probe rod probe 120 and the calibration cover opening 201 is D2, D1 is less than D2, namely, the filter sheet 230 is located inside the calibration cover 200 and does not protrude out of the calibration cover opening 201, and therefore a better filtering effect is achieved. The calibration cap 200 of the present invention is made of an anti-corrosion material, the shape of the calibration cap 200 is not limited to a cylinder, an ellipse or a polygon (as shown in fig. 4 a-b), and the calibration cap 200 is a cylinder (as shown in fig. 4 a) in this embodiment.
A sensor lock head 220 is arranged at the end of the probe rod probe 120, and the temperature and humidity sensor 210 is arranged on the probe rod probe 120 through the sensor lock head 220, so that the temperature and humidity sensor 210 is positioned in the calibration cover 200 (as shown in fig. 2), and the temperature and humidity sensor 210 is electrically connected with the integrated control module 300 through a lead. This temperature and humidity sensor 210 can react to the humiture of surrounding environment fast, carries out flue gas humidity and examines time measuring, the utility model discloses an in the calibration cover 200 one end infiltration chimney of online flue gas hygrometer, temperature and humidity sensor 210 detects the humiture data of flue gas to wait for the instruction on next step with data transfer to integrated control module 300.
Carry out flue gas monitoring time measuring, stretch into the flue with probe rod probe 120 of online flue gas hygrometer, because the utility model discloses a calibration cover 200 is semi-open, has the anti-interference effect, can delay the velocity of flow of flue gas in the flue for flow field in the flue tends to stably, has both avoided the impact of flue gas, also does benefit to and collects the flue gas. The problem that the sensor is damaged frequently in the smoke measuring instrument in the prior art is that the sensor is blocked and cannot be fully contacted with smoke due to the fact that crystals such as dust or ammonium salt are adsorbed and accumulated on the sensor for a long time, and the sensor cannot accurately measure the humidity value of the smoke even if the sensor is damaged due to corrosion. And the utility model discloses broken prior art's prejudice, creative calibration cover 200 that sets up semi-open in the sensor outside sets up, sets up inner cover 202 again in calibration cover 200 simultaneously, and one side of temperature and humidity sensor 210 contact flue gas still sets up and has the cassette 230 again, and when carrying out flue gas humidity measurement, the cassette 230 is used for carrying out the blowback to the flue gas, has both avoided flue gas direct contact temperature and humidity sensor 210, can effectively block dust etc. again.
A calibration controller 320 is arranged in the integrated control module 300, the calibration controller 320 includes a zero potentiometer 330 and a full scale potentiometer 340 (as shown in fig. 3), the zero potentiometer 330 and the full scale potentiometer 340 are electrically connected to the temperature and humidity sensor 210, the temperature and humidity sensor 210 converts the humidity of the flue gas into an electrical signal, the calibration controller 320 starts full scale/zero calibration after receiving data, the calibrated voltage signal generates a corresponding current signal through a current-voltage conversion circuit, and the current signal is displayed on a display screen of the integrated control module 300 after data processing.
It is worth explaining, in order to make the flue gas data measurement accurate, the utility model discloses set up the blowback calibration mouth 400 that admits air, blowback calibration mouth 400 that admits air is used for carrying out online blowback calibration to the hygrograph. The intake blowback calibration port 400 is electrically connected with the integrated control module 300, and the integrated control module 300 controls the intake blowback calibration port 400, so that the flue gas at the calibration cover 200 can be blowback in real time. The intake blowback calibration port 400 of the present embodiment is provided at the probe 100. The intake blowback calibration port 400 is connected to a blowback calibration gas path 410, the blowback calibration gas path 410 is disposed in the probe rod 100, and an end of the blowback calibration gas path 410 away from the intake blowback calibration port 400 is disposed in the calibration cap 200.
The integrated control module 300 is further provided with a blowback controller 310, the blowback controller 310 is electrically connected with the intake blowback calibration port 400, and the blowback controller 310 is used for controlling a blowback source to realize the calibration function. During calibration, the blowback gas of the air inlet blowback calibration port 400 is dry clean gas, the blowback gas of the embodiment is high-purity nitrogen, the high-purity nitrogen enters the blowback calibration port 400, flows into the calibration cover 200 along the blowback calibration air path 410, performs blowback on the flue gas in the calibration cover 200, and then adjusts the zero potentiometer 330 to be consistent with the zero humidity, and performs online humidity fullness calibration through a known humidity source. In order to achieve the calibration purpose, the pressure of the back-blowing gas of the air-inlet back-blowing calibration port 400 is 0.15-0.25 MPa, and the pressure can discharge the smoke around the temperature and humidity sensor 210 to the maximum extent and can effectively avoid the influence of the airflow on the flow field. The back-blowing gas pressure of the inlet back-blowing calibration port 400 of this embodiment is 0.15 MPa. In addition, the online calibration of the flue gas humidity is performed by back-blowing through the back-blowing calibration port 400, and the flue gas discharged from the humidity meter is calibrated, but if the gas source at the calibration hood 200 is in an unstable state, the calibration result is prone to have errors. And the utility model discloses a set up semi-open calibration cover 200 with the place of air supply contact, provide the required semi-enclosed stable flow field of calibration for no matter be the calibration at zero point or the calibration of full scale, all can be so that the calibration environment is in steady state, and the accuracy of calibration also obtains promoting, still protects temperature and humidity sensor 210 simultaneously.
Example 2
The present embodiment is basically the same as embodiment 1, and as shown in fig. 5, the difference is that: the intake blowback calibration port 400 of the present embodiment is provided at the integrated control module 300. The intake blowback calibration port 400 is connected to a blowback calibration gas path 410, the blowback calibration gas path 410 is disposed in the probe rod 100, and an end of the blowback calibration gas path 410 away from the intake blowback calibration port 400 is disposed in the calibration cap 200. The integrated control module 300 is internally provided with a blowback controller 310, and the blowback controller 310 is electrically connected with the intake blowback calibration port 400. During calibration, dry clean gas is filled into the air inlet back-blowing calibration port 400, the back-blowing gas in the embodiment is compressed air for the instrument, the compressed air for the instrument enters the back-blowing calibration port 400, flows into the calibration cover 200 along the back-blowing calibration air path 410, and carries out back-blowing evacuation on smoke around the temperature and humidity sensor 210 for the smoke in the calibration cover 200, and the measured value of the temperature and humidity sensor 210 is taken as a calibration value at the moment, so that the on-line calibration of the smoke humidity instrument is realized through the back-blowing smoke. In order to achieve the calibration purpose, the pressure of the blowback gas in the intake blowback calibration port 400 is controlled to 0.25MPa in this embodiment.
Example 3
The present embodiment is basically the same as embodiment 1, and as shown in fig. 6, the difference is that: the intake blowback calibration port 400 of the present embodiment is provided at the calibration cap 200. The intake blowback calibration port 400 is connected to a blowback calibration gas path 410, the blowback calibration gas path 410 is disposed in the probe rod 100, and an end of the blowback calibration gas path 410 away from the intake blowback calibration port 400 is disposed in the calibration cap 200. The integrated control module 300 is internally provided with a blowback controller 310, and the blowback controller 310 is electrically connected with the intake blowback calibration port 400. During calibration, the blowback gas of the air inlet blowback calibration port 400 is dry clean gas, the blowback gas of the embodiment is compressed air for instruments, the compressed air for instruments enters the blowback calibration port 400, flows into the calibration cover 200 along the blowback calibration air path 410, and performs blowback evacuation of flue gas around the temperature and humidity sensor 210 on flue gas in the calibration cover 200. For calibration purposes, the pressure of the blowback gas in the intake blowback calibration port 400 of this embodiment is 0.20 MPa.
Example 4
The utility model discloses an online calibration method of online flue gas hygrometer, through controlling integrated control module 300 start-up blowback calibration mouth 400 that admits air, blowback gas gets into in calibration cover 200 along blowback calibration gas circuit 410. The flue gas with temperature and humidity sensor 210 around is convenient for discharge for appear dry atmosphere in the calibration cover 200, calibration cover 200 can also provide stable flow field for temperature and humidity sensor 210 simultaneously, improves the calibration accuracy of online flue gas hygrometer.
Unlike the prior art, the online calibration of the present embodiment is divided into an online automatic calibration and an online manual calibration, wherein the online automatic calibration is an automatic calibration of an online zero point. The back flushing time of the back flushing gas is controlled in a mode which is not limited to an electromagnetic valve, the back flushing gas in the embodiment is compressed air for an instrument, and the integrated control module 300 starts back flushing the smoke in the calibration cover 200 and controls the zero potentiometer 330 to perform zero automatic calibration; at this time, the calibration cover 200 provides a stable flue flow field for the temperature and humidity sensor 210, signals collected by the temperature and humidity sensor 210 are fed back to the integrated control module 300, and then the instructions are automatically sent to the temperature and humidity sensor 210 through an algorithm in the program, so that the zero point online automatic calibration is realized.
The on-line manual multi-point linear calibration of the embodiment can be realized by analog quantity control or digital quantity control. When the analog quantity is used for controlling back flushing and calibration, the zero potentiometer 330 or the full potentiometer 340 is adjusted, the temperature and humidity sensor 210 is used for converting the measured flue gas humidity into the analog quantity of 4-20 mA, and the data are transmitted to the calibration controller 320. Meanwhile, nitrogen is introduced into the air inlet back flushing calibration port 400 to further evacuate smoke around the temperature and humidity sensor 210, then the zero potentiometer 330 is adjusted to be consistent with the zero humidity value, and the online zero calibration function is achieved, or the online full calibration function is achieved by adjusting the full scale potentiometer 340 to be consistent with the humidity value of the known humidity air source.
The integrated control module 300 is provided with a human-computer interface, a control key and a digital communication interface, when manual calibration is carried out by using digital quantity control, after the humidity value of a humidity air source is known, a stable humidity air source is introduced into the calibration cover 200 through the air inlet back-blowing calibration port 400, the human-computer interface, the digital communication interface and the like are observed to display an actual humidity value, the actual humidity value is compared with the known humidity value after the actual humidity value is stabilized, and the actual display value is correspondingly corrected to be consistent with the known humidity value by operating a touch screen or a key of the human-computer interface, so that the online back-blowing and calibration functions are realized.
The invention has been described above in detail with reference to specific exemplary embodiments. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to illustrate the present state of the art and the meaning of the present development and is not intended to limit the present invention or the present application and the field of application of the present invention.
More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, such as combinations between various embodiments, adapted changes and/or substitutions as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Claims (9)
1. The utility model provides an online flue gas hygrometer with blowback calibration function which characterized in that: the device comprises a probe rod (100), a calibration cover (200), an integrated control module (300) and an air inlet blowback calibration port (400);
the probe rod (100) comprises a probe rod tail part (110) and a probe rod probe (120), wherein the probe rod tail part (110) is connected with the integrated control module (300), and a calibration cover (200) is arranged outside the probe rod probe (120);
a temperature and humidity sensor (210) is arranged in the calibration cover (200); the temperature and humidity sensor (210) is electrically connected with the integrated control module (300), and the integrated control module (300) comprises a calibration controller (320) and a blowback controller (310);
a back-blowing calibration air passage (410) is arranged in the probe rod (100), and an air inlet back-blowing calibration port (400) is connected with the calibration cover (200) through the back-blowing calibration air passage (410).
2. The on-line flue gas hygrometer with blowback calibration function of claim 1, wherein: one side of the calibration cover (200) close to the probe rod probe (120) is connected with the probe rod (100) in a sealing mode, and one side of the calibration cover (200) far away from the probe rod probe (120) is provided with a calibration cover opening (201).
3. The on-line flue gas hygrometer with blowback calibration function of claim 1, wherein: an inner cover (202) is arranged in the calibration cover (200), and the inner cover (202) is arranged outside the probe head (120) in a surrounding mode.
4. The on-line flue gas hygrometer with blowback calibration function of claim 1, wherein: the calibration controller (320) comprises a zero potentiometer (330) and a full scale potentiometer (340), and the zero potentiometer (330) and the full scale potentiometer (340) are electrically connected with the temperature and humidity sensor (210) through conducting wires respectively.
5. The on-line flue gas hygrometer with blowback calibration function of claim 1, wherein: the intake blowback calibration port (400) is electrically connected with a blowback controller (310) of the integrated control module (300).
6. The on-line flue gas hygrometer with blowback calibration function of claim 1, wherein: the back-blowing gas of the air inlet back-blowing calibration port (400) is high-purity nitrogen or compressed air for instruments.
7. The on-line flue gas hygrometer with blowback calibration function of claim 1, wherein: the pressure of the back blowing gas of the air inlet back blowing calibration port (400) is 0.15-0.25 MPa.
8. The on-line flue gas hygrometer with blowback calibration function of claim 3, wherein: the filter (230) is arranged at one end, far away from the probe head (120), of the inner cover (202), the distance from the end of the probe head (120) to the filter (230) is D1, the distance from the end of the probe head (120) to the opening (201) of the calibration cover is D2, and D1 is less than D2.
9. The on-line flue gas hygrometer with blowback calibration function as claimed in any one of claims 1-8, wherein: the calibration cap (200) is cylindrical, or elliptical, or polygonal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537586A (en) * | 2020-04-17 | 2020-08-14 | 中国特种设备检测研究院 | Oxygen sensor with self-calibration function |
| CN113406149A (en) * | 2021-06-08 | 2021-09-17 | 无锡时和安全设备有限公司 | Device and method for measuring volume ratio of humidity of high-temperature flue gas |
| CN114005559A (en) * | 2021-10-28 | 2022-02-01 | 华能核能技术研究院有限公司 | Online calibration system and method for primary loop humidity instrument of high-temperature gas cooled reactor |
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2019
- 2019-04-30 CN CN201920621430.3U patent/CN209894793U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537586A (en) * | 2020-04-17 | 2020-08-14 | 中国特种设备检测研究院 | Oxygen sensor with self-calibration function |
| CN111537586B (en) * | 2020-04-17 | 2022-10-28 | 中国特种设备检测研究院 | Oxygen content sensor with self-calibration function |
| CN113406149A (en) * | 2021-06-08 | 2021-09-17 | 无锡时和安全设备有限公司 | Device and method for measuring volume ratio of humidity of high-temperature flue gas |
| CN114005559A (en) * | 2021-10-28 | 2022-02-01 | 华能核能技术研究院有限公司 | Online calibration system and method for primary loop humidity instrument of high-temperature gas cooled reactor |
| CN114005559B (en) * | 2021-10-28 | 2023-08-15 | 华能核能技术研究院有限公司 | Online checking system and method for high-temperature gas cooled reactor primary loop hygrometer |
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