CN1800842A - Online resistance-capacitance type method and apparatus for analyzing water content in high temperature smoke - Google Patents
Online resistance-capacitance type method and apparatus for analyzing water content in high temperature smoke Download PDFInfo
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- CN1800842A CN1800842A CN 200610037752 CN200610037752A CN1800842A CN 1800842 A CN1800842 A CN 1800842A CN 200610037752 CN200610037752 CN 200610037752 CN 200610037752 A CN200610037752 A CN 200610037752A CN 1800842 A CN1800842 A CN 1800842A
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Abstract
The online RC high-temperature smoke moisture device comprises: a RC humidity sensor with a macromolecular film capacitor humidity sensor and a temperature sensor and a heater (Hr) connected to a heating temperature controller, a high-frequency oscillation circuit with input end connected to said humidity sensor and output end connected to the following conversion circuit, a frequency/voltage conversion circuit to output voltage signal direct proportioned to water content and connect to the following compensation circuit and take zero point full scale calibration by a calibration circuit, a smoke compensation treatment circuit, and a current-to-voltage conversion circuit. Wherein, directed outputting the calibrated signal or through the current-to-voltage conversion circuit to display device. This invention ensures the precision and reliability to meet practical application request.
Description
Technical field
The present invention relates to a kind of high temperature flue gas moisture analytical approach, is a kind of online resistance-capacitance type high-temperature flue gas analytical approach and analytical instrument specifically.
Background technology
High-temperature flue gas refers generally to the gas that thermoelectricity industry coal fired power generation engineering produces, as a kind of more special medium, general temperature range is at the 80-120 degree, may reach 160 degree under the particular case, generally can there be dust and acidic materials such as SO2 in the flue gas in addition, NOX etc., how to overcome high temperature, high dust and acidic materials and guarantee the on-line measurement of flue gas moisture, it is a very difficult problem, generally use at present scandium oxide to measure oxygen amount in the dried wet flue gas at home, obtain flue gas moisture by calculating, it is a kind of method of indirect measurement, the subject matter that this method exists is that the cost measured is high and precision that measure is low, can not satisfy the needs that high-temperature flue gas is measured.
Departments such as industrial and agricultural production, meteorology, environmental protection, national defence, scientific research, space flight often need measure and control ambient moisture.All become one of commonplace technical conditions to the control of environment temperature, moisture and to the monitoring of industrial materials moisture content value with analyzing, but in the environmental parameter of routine, moisture is a parameter of the most difficult accurate measurement.
Stipulate that in measurement Law moisture is defined as " amount of image state ".The moisture of indication is relative moisture in the daily life, represents with RH%.In sum, i.e. the number percent of saturated steam amount (Saturated water vapor pressure) under (being generally in the air) contained steam vapour amount (water vapor pressure) and its air same case in the gas.
Moisture measurement is one of difficult problem famous in world's metering field all the time.One seems simple value, go into seriously, relate to quite complicated physics-chemical theory analysis and calculating, this be because measure moisture than measure the temperature complexity many, temperature is an independently measured value, and moisture is subjected to the influence of other factors (atmospheric pressure, temperature).。
Moisture measurement is divided from principle two, 30 kind more than.Common moisture measuring method has: dynamic method (two platen presses, dual-temperature process, shunting), static method (saturated salt method, sulfuric acid process), dew point method, measurement with wet and electronic sensor method.Electronic type moisture transducer product and moisture measurement belong to the industry of rising the nineties, in recent years, have obtained rapid progress in moisture transducer research and development field both at home and abroad.Moisture sensor just develops rapidly to direction integrated, intelligent, that multiparameter detects from simple humidity-sensitive element, has created advantage for Development of New Generation moisture TT﹠C system, also the moisture measurement technology is brought up to new level.
The present abroad developing direction of the measurement of gas moisture mainly is to utilize macromolecule membrane capacity-type electronic measuring technique, and typical case's representative in this field mainly contains following two families:
1. Finland VAISALA: the specialized vendor who is warm water branch fields of measurement, the pyrostat that can be used for on-line measurement of exploitation is at present, adopt the sensitive element of thin-film capacitor, because withstand corrosion not on structure and the material, can not be used to contain the on-line measurement of the high-temperature flue gas of sour gas, specifically be applied to the moisture measurement of paper industry high-temperature steam.
2. German TESTO: be the specialized vendor in moisture measurement field, lay particular emphasis on the measurement of the portable gas moisture under the various occasions, do not have to be applied in the product that high temperature flue gas moisture is measured.
Domestic technology and the product that moisture and moisture measurement have been arranged at present, but owing to also have certain problem on the technology, the precision of measurement and the scope of use are also relatively limited to, and generally only are used for the moisture measurement of conventional environment at present.
Summary of the invention
The present invention is exactly at above-mentioned the deficiencies in the prior art, provide a kind of dust, high temperature and sour corrosion problem that can overcome high-temperature flue gas, can the measurement high-temperature flue gas of online long-term stability in the online resistance-capacitance type high temperature flue gas moisture instrument of moisture.
The online resistance-capacitance type high temperature flue gas moisture instrument of the present invention, the technical scheme that is adopted is:
1) anti-dust stainless steel sintered filter sampling apparatus: solve exhaust gas dust wearing and tearing and blockage problem in the flue gas on-line measurement process.
2) resistance-capacitance type flue gas moisture measuring principle: adopt the combination of macromolecule membrane electric capacity humidity sensing element and platinum resistance temperature sensor.Water vapour passes the upper electrode of macromolecule membrane electric capacity humidity sensing element, arrives macromolecule living polymer film.Water vapour in the flue gas is depended on moisture height in the flue gas on every side by the value of film absorption, because size sensor is little and thin polymer film is very thin, make rapid reaction so sensor can change the humidity of surrounding environment.The water vapour that absorbs in the polymkeric substance has changed the dielectric characteristic of sensor and the capacitance of sensor is changed, because the content and the capacitance variations of moisture are linear in the flue gas, thereby can solve the problem that high-temperature flue gas is measured moisture by metering circuit.Platinum resistance temperature sensor is measured flue-gas temperature and is changed, and is used to carry out temperature compensation.
3) measuring sonde high temperature companion heat:, avoid occurring condensate water and cause SO2 and NOX in the flue gas to become acid and the corrosion measurement probe by the moisture dewfall that heating reaches the temperature of measuring sonde to prevent in the flue gas.
Temperature compensation: because flue gas moisture can change with the variation of flue-gas temperature, need to measure the actual temperature of flue gas, adopt temperature compensation to reduce the error of moisture measurement, satisfy the precision of measuring.
The high temperature flue gas moisture analytical approach, adopt the electric capacity humidity sensing element as moisture transducer, and utilize high-frequency oscillating circuits and frequency/voltage change-over circuit that the output signal of moisture transducer is changed, the signal that obtains magnitude of voltage and be directly proportional with moisture, be provided with the temperature compensation treatment circuit, by temperature voltage signal that changes with flue-gas temperature of temperature sensor output, connect this voltage to the temperature compensation treatment circuit, electric capacity/frequency variation signal and temperature variation signal be transferred to respectively carry out temperature self-compensation in frequency-voltage conversion circuit and the auto thermal compensation circuit and handle the signal that is directly proportional with tested gas water content that output calibration is crossed.
Electric signal after repaying through the cigarette temperature compensation output to the zero point/the full scale calibration circuit carries out full scale calibration at zero point; Voltage signal after the calibration is directly exported or is generated corresponding 4-20mA current signal by current-to-voltage converting circuit again, exports the monitor data processing unit to and can connect on-the-spot display device.
High temperature flue gas moisture instrument is characterized in that comprising the resistance-capacitance type humidity sensor, high-frequency oscillating circuits, frequency/voltage change-over circuit; Treatment circuit full scale at zero point calibration circuit and voltage current adapter are repaid in the cigarette temperature compensation, thus the electric signal that generation and moisture are directly proportional, and described resistance-capacitance type humidity sensor comprises that macromolecule membrane electric capacity humidity sensing element is used to measure flue gas moisture; The platinum resistance temperature sensor of measuring flue-gas temperature is used for temperature self-compensation; Well heater with heating macromolecule membrane electric capacity humidity sensing element connects the heating temperature control device with heater H r; Macromolecule membrane electric capacity humidity sensing element connects the input end of high-frequency oscillating circuits, the output terminal of high-frequency oscillating circuits connects the input end of frequency/voltage change-over circuit, the voltage signal that the output terminal output of change-over circuit is directly proportional with moisture, and connect the cigarette temperature compensation with the temperature signal that the output cigarette temperature of cigarette temperature temperature sensor circuit changes and repay treatment circuit, the electric signal after temperature compensation is repaid through cigarette output to the zero point/the full scale calibration circuit carries out full scale calibration at zero point; Voltage signal after the calibration is directly exported or is generated corresponding 4-20mA current signal by current-to-voltage converting circuit again, exports the display monitoring device to.
It is the VCA610 variable-gain amplification circuit that treatment circuit is repaid in the cigarette temperature compensation, by VCA610 and P1 moisture signal is carried out the compensation automatically of cigarette temperature; Electric signal after repaying through the cigarette temperature compensation output to the zero point/full scale calibration circuit (referring to 3.5 among Fig. 3) LM385 circuit, and be provided with the full scale calibration that adjustable resistance P2 carries out the humidity electric signal at the output terminal of LM385, be provided with the zero point correction that resistance P3 carries out the humidity electric signal at LM385.
Characteristics of the present invention are:
1) adopts above-described 4 kinds of comprehensive technological schemes, solved technical barriers such as the high temperature that is faced in the high temperature flue gas moisture measuring process, high dust and deep-etching well;
2) utilize technique for temperature compensation to guarantee precision and reliability that flue gas moisture is measured, actual result of use can satisfy following designing technique index fully:
Flue gas is measured temperature :-20-+180 ℃ ± 2 ℃;
Flue gas moisture is measured: 0-20% ± 2%
3) at present product practical probation overlap more, the longest run time passes through year, result of use satisfies requirement of client.
Description of drawings
Fig. 1 is the online resistance-capacitance type high temperature flue gas moisture instrument of a present invention resistance-capacitance type humidity sensor synoptic diagram
Fig. 2 is the online resistance-capacitance type high temperature flue gas moisture instrument of a present invention principle of work block diagram
Fig. 3 is the online resistance-capacitance type high temperature flue gas moisture instrument of a present invention circuit diagram
Embodiment
Below in conjunction with accompanying drawing the principle and the implementation method of online resistance-capacitance type high temperature flue gas moisture instrument are carried out specific description:
1) the resistance-capacitance type sensor comprises macromolecule membrane electric capacity humidity sensing element (C0 among Fig. 1), is used for measuring the change of soil water content of high-temperature flue gas;
2) Pt100 platinum resistance cigarette temperature sensor (Rt among Fig. 1), the flue-gas temperature variation that is used to measure high-temperature flue gas is used for the temperature compensation that flue gas moisture is measured;
3) well heater (Hr among Fig. 1) is used for heating macromolecule membrane electric capacity humidity sensing element (C0 of Fig. 1), prevents hydrogenesis in the flue gas and corrosion and damage macromolecule membrane electric capacity humidity sensing element (C0 among Fig. 1),
4) above 3 have formed high temperature flue gas moisture instrument resistance-capacitance type humidity sensor jointly.
Apparatus of the present invention are a kind of high temperature flue gas moisture on-line measurements that are specifically designed to, and illustrate that according to principle of work block diagram (Fig. 2) method of work and step are as follows:
1) the resistance-capacitance type humidity sensor with figure one places high-temperature flue gas;
2) heater H r is heated by heating temperature control device (referring to 2.1 among Fig. 2);
3) high-frequency signal that high frequency oscillator (referring to 2.3 among Fig. 2) is produced outputs on the macromolecule membrane electric capacity humidity sensing element Ch;
4) because the changing value of the electric capacity of macromolecule membrane electric capacity humidity sensing element Ch and measured flue gas moisture content has certain functional relation, the variation of moisture makes capacitance change, thereby the frequency of high frequency oscillator Fc is changed, and the higher-order of oscillation frequency that changes with moisture value outputs to f/v frequency/voltage change-over circuit (referring to 2.4 among the figure two);
5) become the voltage signal that and flue gas moisture content are directly proportional through f/v frequency-voltage conversion circuit (referring to 2.4 among the figure two), this signal outputs to automatic cigarette temperature compensation and repays circuit (referring to 2.5 among the figure two) and carry out the cigarette temperature compensation and repay processing;
6) electric signal after repaying through the cigarette temperature compensation output to the zero point/full scale calibration circuit (referring to 2.6 among Fig. 2) carries out full scale calibration at zero point; Electrical signal after the cigarette temperature compensation is repaid connect the zero point/the full scale calibration circuit, and the zero point/the full scale calibration circuit is made of secondary transport and placing device LM385 circuit, output terminal at the one-level transport and placing device is provided with the full scale calibration that adjustable resistance P2 carries out the humidity electric signal, and second level transport and placing device LM385 is provided with the zero point correction that adjustable resistance P3 carries out the humidity electric signal.
7) electric signal after the calibration outputs to voltage-current converter circuit (referring to 2.7 among Fig. 2) and handles, and voltage signal is generated corresponding 4-20mA current signal, outputs to relevant monitoring, display device again;
8) synchronous therewith is the temperature signal that the cigarette temperature that cigarette temperature sensor (referring to the RT among Fig. 2) is measured changes to be outputed to temperature conversion circuit (referring to 2.2 among Fig. 2) handle;
9) temperature compensation signal after handling outputs to automatic cigarette temperature compensation again and repays circuit (referring among Fig. 2 2.5) and carry out the cigarette temperature compensation and repay.
Specify method of work and step is as follows according to working circuit diagram (Fig. 3):
1) resistance-capacitance type humidity sensor (referring to 3.1 among Fig. 3) is placed high-temperature flue gas;
2) heater H r is heated the resistance-capacitance type humidity sensor by heating temperature control device (referring to 3.1 among Fig. 3);
3) high-frequency signal that high frequency oscillator (referring to 3.2 among Fig. 3) is produced outputs to macromolecule membrane capacitive humidity sensor C0 and goes up (referring to 3.1 among Fig. 3);
4) macromolecule membrane electric capacity humidity sensing element C0 (referring to 3.1 among Fig. 3) makes electric capacity change because of the variation of moisture (smoke moisture) in the flue gas of measuring, thereby the concussion frequency values fc of high frequency oscillator also (referring to 3.2 among Fig. 3) changes, and the high frequency oscillation ripple that becomes with the content of moisture intercepts the input end that capacitor C 5 outputs to f/v frequency-voltage conversion circuit (referring to 3.3 among Fig. 3) LF412 through direct current;
5) through after f/v frequency/voltage change-over circuit (referring to 3.3 among Fig. 3) the signal transformation processing, with frequency (humidity) conversion of signals is corresponding 0-1V voltage signal, output terminal output from f/v frequency-voltage conversion circuit (referring to 3.3 Fig. 3), through being input to input end R11, the R13 that circuit (referring to 3.4 among Fig. 3) repaid in automatic cigarette temperature compensation behind the C6 smothing filtering, corresponding cigarette temperature electric signal also is input to the VCA610 variable-gain amplification circuit simultaneously, by VCA610 and P1 moisture signal is carried out the compensation automatically of cigarette temperature;
6) electric signal after repaying through the cigarette temperature compensation output to the zero point/input end of full scale calibration circuit (referring to 3.5 among Fig. 3) LM385, carry out the full scale calibration of humidity electric signal by P2, carry out the zero point correction of humidity electric signal by P3;
7) electric signal after the calibration carries out voltage amplification to 0-10V by LM385, outputing to voltage-current converter circuit (referring to 3.6 among Fig. 3) AD694 handles, the voltage signal of 0-10V is transformed into corresponding 4-20mA current signal, outputs to relevant monitoring, display device again;
8) synchronous therewith is that the temperature conversion circuit (referring to the temp controlled meter among Fig. 3) that the temperature signal that the cigarette temperature that cigarette temperature sensor Rt (referring to 3.1 among Fig. 3) measures changes outputs in the temp controlled meter is handled, with the electrical signal conversion of cigarette temperature is the current signal of 4-20mA, and the current signal with 4-20mA is converted to 0-10V cigarette temperature electric signal through RCV420 (referring to Fig. 3) again;
9) the cigarette temperature electric signal after the processing outputs to the RCA610 that circuit (referring to 3.4 among Fig. 3) repaid in automatic cigarette temperature compensation again, carries out the cigarette temperature compensation and repays (referring to the 5th of this section).
10) required power supply 24VDC after handling by the DC/DC module, is converted to ± 12VDC (referring to 3.7 among Fig. 3), and handles the preposition power supply of back output 5VDC by three-terminal voltage-stabilizing circuit 7805 and C7, C8, C9;
Claims (5)
1, online resistance-capacitance type high temperature flue gas moisture instrument is characterized in that comprising the resistance-capacitance type humidity sensor, high-frequency oscillating circuits, frequency/voltage change-over circuit; Treatment circuit and voltage-current converter circuit are repaid in the cigarette temperature compensation, described resistance-capacitance type humidity sensor comprises the macromolecule membrane electric capacity humidity sensing element that is used for the flue gas moisture measurement, being used for the cigarette temperature temperature sensor of temperature compensation and the well heater combination of heating macromolecule membrane electric capacity humidity sensing element forms; Described well heater (Hr) connects the heating temperature control device; Macromolecule membrane electric capacity humidity sensing element connects the input end of high-frequency oscillating circuits, the output terminal of high-frequency oscillating circuits connects the frequency/voltage change-over circuit, the frequency/voltage change-over circuit is output as the voltage signal that is directly proportional with moisture, and connect the cigarette temperature compensation with the temperature signal that the output cigarette temperature of cigarette temperature temperature sensor circuit changes and repay treatment circuit, the electric signal after temperature compensation is repaid through cigarette output to the zero point/the full scale calibration circuit carries out full scale calibration at zero point; Voltage signal after the calibration is directly exported or is generated corresponding 4-20mA current signal by current-to-voltage converting circuit again, outputs to the demonstration monitoring device.
2,, it is characterized in that the cigarette temperature compensation repays the variable-gain amplification circuit that treatment circuit constitutes for the VCA610 chip by the described high temperature flue gas moisture instrument of claim 1.
3, by claim 1 or 2 described high temperature flue gas moisture instruments, it is characterized in that electrical signal after the cigarette temperature compensation is repaid connect the zero point/the full scale calibration circuit, and the zero point/the full scale calibration circuit is made of secondary transport and placing device (LM385) circuit, output terminal at the one-level transport and placing device is provided with the full scale calibration that adjustable resistance (P2) carries out the humidity electric signal, and second level transport and placing device (LM385) is provided with the zero point correction that adjustable resistance (P3) carries out the humidity electric signal.
4, the high temperature flue gas moisture analytical approach, adopt the electric capacity humidity sensing element as moisture transducer, and utilize high-frequency oscillating circuits and frequency/voltage change-over circuit that the output signal of moisture transducer is changed, the signal that obtains magnitude of voltage and be directly proportional with moisture, it is characterized in that being provided with the temperature compensation treatment circuit, by temperature voltage signal that changes with flue-gas temperature of temperature sensor output, connect this voltage to the temperature compensation treatment circuit, electric capacity/frequency variation signal and temperature variation signal be transferred to respectively carry out temperature self-compensation in frequency-voltage conversion circuit and the auto thermal compensation circuit and handle the signal that is directly proportional with tested gas water content that output calibration is crossed.
5, by the described high temperature flue gas moisture analytical approach of claim 4, the electric signal after it is characterized in that repaying through the cigarette temperature compensation output to the zero point/the full scale calibration circuit carries out full scale calibration at zero point; Voltage signal after the calibration is directly exported or is generated corresponding 4-20mA current signal by current-to-voltage converting circuit again, exports the monitor data processing unit to and can connect on-the-spot display device.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749364A (en) * | 2012-07-06 | 2012-10-24 | 山东省科学院海洋仪器仪表研究所 | Relative humidity sensor for marine meteorological elements |
| CN103592199A (en) * | 2013-10-21 | 2014-02-19 | 中国中元国际工程公司 | Liquid-phase water content detection device and liquid-phase water content detection method for wet steam |
| CN105651831A (en) * | 2014-11-15 | 2016-06-08 | 新疆科立机械设备有限公司 | A device of measuring the water content of a granular material based on capacitance |
| CN108037155A (en) * | 2017-12-27 | 2018-05-15 | 武汉洪兴伟业环境科技有限公司 | A kind of humidity of flue gas analyzer |
| CN109708994A (en) * | 2019-02-22 | 2019-05-03 | 深圳市盛隆兆业实业有限公司 | The online specific gravity test system of coke-stove gas |
| CN113138210A (en) * | 2021-06-22 | 2021-07-20 | 电子科技大学 | Self-adaptive local Gaussian temperature and humidity compensation method for intelligent gas sensor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10506716A (en) * | 1995-06-30 | 1998-06-30 | クラウス チュヒナー， | Method and measuring device for determining the water content of a gas |
| CN2449226Y (en) * | 2000-11-02 | 2001-09-19 | 中国石油化工股份有限公司 | Resistance-capacity type online moisture tester |
| CN1147726C (en) * | 2000-12-07 | 2004-04-28 | 南京供电局 | Method and apparatus for monitoring moisture content of isolation gas |
| DE10164018B4 (en) * | 2001-12-28 | 2004-03-04 | Wollesen, Dirk, Dr. | Procedure for determining the heat capacity and, if applicable, the thermal conductivity |
| CN2840030Y (en) * | 2005-09-05 | 2006-11-22 | 南京埃森环境技术有限公司 | Online resistance-capacitance type high temperature flue gas moisture instrument |
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- 2006-01-13 CN CNB2006100377520A patent/CN100394169C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749364A (en) * | 2012-07-06 | 2012-10-24 | 山东省科学院海洋仪器仪表研究所 | Relative humidity sensor for marine meteorological elements |
| CN103592199A (en) * | 2013-10-21 | 2014-02-19 | 中国中元国际工程公司 | Liquid-phase water content detection device and liquid-phase water content detection method for wet steam |
| CN103592199B (en) * | 2013-10-21 | 2015-11-25 | 中国中元国际工程有限公司 | Liquid phase water content on-line measuring device and detection method in wet steam |
| CN105651831A (en) * | 2014-11-15 | 2016-06-08 | 新疆科立机械设备有限公司 | A device of measuring the water content of a granular material based on capacitance |
| CN108037155A (en) * | 2017-12-27 | 2018-05-15 | 武汉洪兴伟业环境科技有限公司 | A kind of humidity of flue gas analyzer |
| CN109708994A (en) * | 2019-02-22 | 2019-05-03 | 深圳市盛隆兆业实业有限公司 | The online specific gravity test system of coke-stove gas |
| CN113138210A (en) * | 2021-06-22 | 2021-07-20 | 电子科技大学 | Self-adaptive local Gaussian temperature and humidity compensation method for intelligent gas sensor |
| CN113138210B (en) * | 2021-06-22 | 2021-09-24 | 电子科技大学 | Self-adaptive local Gaussian temperature and humidity compensation method for intelligent gas sensor |
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Address after: 210005, No. 699, Xuanwu Avenue, Nanjing, Jiangsu, 11, -22 Patentee after: Nanjing Assen Environmental Technology Co., Ltd. Address before: Nanjing City, Jiangsu province Longpan road 210005 No. 168 Jiangsu Software Park Building 1, room 1212 Patentee before: Nanjing Assen Environment Technology Co., Ltd. |