CN101561426A - Humidity measuring method and measuring device used for CEMS system - Google Patents
Humidity measuring method and measuring device used for CEMS system Download PDFInfo
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- CN101561426A CN101561426A CN 200910027151 CN200910027151A CN101561426A CN 101561426 A CN101561426 A CN 101561426A CN 200910027151 CN200910027151 CN 200910027151 CN 200910027151 A CN200910027151 A CN 200910027151A CN 101561426 A CN101561426 A CN 101561426A
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Abstract
The invention discloses a humidity measuring method and a measuring device used for CEMS system, moisture in flue gas to be detected in a flue is separated to an independent pipeline introduced with dry air by a Nafion drying tube, humidity of separated moisture is detected, and humidity of flue gas to be detected is obtained. The invention provides the humidity measuring method and the device which is applicable for long term usage and is resistant to dust and corrosion, and has an excellent application effect on CEMS system. Accuracy of measurement is not affected, and the service life of a humidity sensor is long. The invention solves the problem that the humidity sensor for moisture measurement on CEMS system in desulphurization of a domestic power plant is liable to be blocked by dust in the flue and corroded by aggressive gas in the flue which results in the current situation of the very low service life of the sensor, has wide application prospect and wide application rang, is suitable for measurement of humidity in high corrosive environment with large amount of dust and is especially suitable for application of humidity measurement on CEMS system in the power plant.
Description
Technical field
The present invention is used for the amount of dust height, environment that corrosivity is big is measured humidity, and the especially application of moisture measurement in the CEMS system in power plant is a kind of humidity measuring method and measurement mechanism that is used for the CEMS system.
Background technology
The domestic principle of measuring by dried wet oxygen in early days converts smoke moisture to; but the measuring error of this metering system is very big; reason is; the degree of drying disunity of dried oxygen; next is that the precision and the degree of stability of measurement of dried wet oxygen instrument is all different; in actual applications, the humidity that often can calculate is negative.
At present, use at home at the continuous online humidity detection of power plant desulfurization fume emission, all be directly to measure by the humidity sensor that is installed in the flue, the measurement using method of humidity is the resistance capacitance method, and its measuring principle is that the characteristic of utilizing the resistance value of humidity-sensitive element, capacitance to change according to certain rules with the variation of ambient humidity is carried out moisture measurement.But the use of humidity-sensitive element has following points for attention:
1), the sense wet end branch of humidity-sensitive element can not touch with hand;
2), the sense wet end branch of humidity-sensitive element avoids contaminated;
3), the sense wet end branch of humidity-sensitive element is avoided being corroded;
4), the sense wet end branch of humidity-sensitive element is avoided using under the condensation environment;
5), when using, devices such as outer cover or filtrator must be installed in the more place of dust;
6), should not use near the gas of 100%RH is medium-term and long-term in humidity.
Yet the operating mode in the flue is generally:
Flue gas SO
2: 178mg/Nm
3, during bad desulfurization effects, mxm. 3900mg/Nm
3
Flue gas NO
X: 886mg/Nm
3
Flue gas flue dust: 66mg/Nm
3, mxm. 286mg/Nm
3
Smoke moisture (volume ratio): 9.31%
Flue-gas temperature: 50 ℃
On-the-spot operating position by in the past gathers, and in the occasion that this high dust, high condensate water, highly corrosive gas exist, external best humidity detection instrument is short serviceable life, just needs to change in maximum 5 months; Instrument drift is big, generally at 5%RH; Safeguard check and correction frequency height, general 1 time/month.
Summary of the invention
The problem to be solved in the present invention is: in the moisture measurement at existing power plant desulfurization CEMS system, and the problem that the humidity sensor life-span is short or measuring error is big, providing a kind of can use for a long time, is not afraid of dust, is not afraid of the humidity measuring instrument of corrosion.
Technical scheme of the present invention is: a kind of humidity measuring method that is used for the CEMS system, moisture in the flue gas to be measured in the flue is separated in another pipeline that independently is connected with dry air by the Nafion drying tube, detect described ducted aqueous vapor humidity, by relational expression:
Smoke moisture to be measured=aqueous vapor humidity * Tx * aqueous vapor flow/(Tn * flue gas flow to be measured) obtains the smoke moisture of flue gas to be measured, and wherein Tx is the saturated vapor pressure under the temperature in the aqueous vapor place pipeline that separates, and Tn is the saturated vapor pressure under the temperature in the flue.
Flue gas to be measured separates before the moisture, filters out the dust in the flue gas to be measured earlier.
A kind of humidity measuring instrument that is used for the CEMS system, be connected on the process pipe of system, comprise the humidity translator, flue gas flow meter to be measured and aqueous vapor flowmeter, the humidity translator comprises outer tube, inner tube and humidity sensor, inner tube is the Nafion drying tube, in the inner tube is flue gas to be measured chamber, be connected with process pipe, outer tube and inner tube constitute the aqueous vapor chamber, and aqueous vapor chamber and flue gas to be measured chamber are separate, are respectively equipped with the gateway, humidity sensor is arranged at the aqueous vapor chamber, the aqueous vapor chamber connects dry source of the gas, and flue gas flow meter to be measured is arranged between flue gas to be measured chamber and the process pipe, and the aqueous vapor flowmeter is arranged between aqueous vapor chamber and the dry source of the gas.
As the pre-service of removing dust in the flue gas to be measured, the present invention also is provided with the smoke dust filtration fraction between process pipe and humidity translator, comprise compressed gas source, solenoid valve, two heating temperature control device and filtrators, process pipe connects the input of filtrator, compressed gas source connects filtrator, solenoid valve is arranged between compressed gas source and the filtrator, one heating temperature control device is arranged on by the filtrator, and another heating temperature control device and flue gas flow meter to be measured are arranged on the connecting path in flue gas to be measured chamber of filtrator and humidity translator.
The flue gas to be measured chamber of measurement mechanism of the present invention connects aspiration pump, and the outer tube of humidity translator is a stainless-steel tube.
The humidity translator of measurement mechanism of the present invention, be to transfer in the outer dry air of Nafion drying tube by the Nafion drying tube by the smoke moisture in the Nafion drying tube, promptly transfer to the aqueous vapor chamber, by the humidity sensor detection humidity in aqueous vapor chamber by flue gas to be measured chamber.By flue gas in the continuous drawing process pipe, elder generation's Chalk-dust filtering, to contain the to be measured flue gas chamber of mordant flue gas again by the humidity translator, moisture is wherein all replaced another independently stream pipeline by the Nafion drying tube, be the aqueous vapor chamber, under the effect of Nafion drying tube, have only moisture to go over, in the aqueous vapor chamber, humidity sensor is housed, draws smoke moisture in the former flue by contrasting two gas flows in the chamber.
By using the Nafion pipe, make corrosive gas all be filtered, and moisture content does not have at high temperature that intact ` infiltrates entirely under the coagulated state, final dew point can reach-45 ℃, and the aqueous vapor infiltration is fully.Thereby form the humidity detection environment of no dust, no etchant gas, no condensate water, can reach more than 2 years the serviceable life of humidity sensor, and instrument drift is not more than 1%RH, safeguards 1 time/half a year of check and correction frequency.
The invention provides a kind of can the use for a long time, be not afraid of dust, be not afraid of the humidity measuring method and the device of corrosion, effect excellence in the CEMS system, measuring accuracy is unaffected, the long service life of humidity sensor, solved in the present domestic power plant desulfurization engineering in the CEMS system that the humidity sensor of moisture measurement is stopped up by dust in the flue easily and by flue internal corrosion gas attack, cause low-down present situation in serviceable life, it is wide to have application prospect, use face width, be applicable to the occasion of in the big environment of amount of dust highly corrosive, measuring humidity, the especially application of moisture measurement in the CEMS system in power plant; Make the measuring accuracy of the online humidity detection instrument of power plant desulfurization flue gas improve, maintenance period prolongs, and strengthen serviceable life, for continuity, the accuracy of environment monitoring data provides necessary guarantee.
Description of drawings
Fig. 1 is the humidity translator structural representation of measurement mechanism of the present invention.
Fig. 2 is the synoptic diagram of measurement mechanism embodiment of the present invention.
Embodiment
The present invention obtains their humidity ratio by the throughput ratio of different pipelines, and then obtain the wherein humidity of a pipeline, moisture in the flue gas to be measured in the flue is separated in the pipeline that is connected with dry air by the Nafion drying tube, detect the aqueous vapor humidity of described pipeline.The humidity of air can generically be interpreted as the moist degree of air. it has the branch of absolute humidity and relative humidity, because it is relatively more difficult directly to measure the density of water in air steam, and the pressure of water vapor increases with the increase of water-vapour density, so absolute humidity refers to the pressure of water in air steam; Relative humidity is in order to represent the water in air steam from the distance of state of saturation and the notion of introducing,
According to the humidity conversion formula: relative humidity=(absolute humidity/saturated vapour pressure) * 100%
Aqueous vapor relative humidity=(aqueous vapor absolute humidity/Tx) * 100% (1)
Flue gas relative humidity=(flue gas absolute humidity/Tn) * 100% (2)
Keep weighing apparatus according to the moisture quality, the moisture in the flue gas to be measured separated the back satisfy:
Flue gas absolute humidity * flue gas flow=aqueous vapor absolute humidity * aqueous vapor flow (3)
Obtain the moisture measurement relational expression of the inventive method according to relational expression (1), (2), (3):
Smoke moisture to be measured=aqueous vapor humidity * Tx * aqueous vapor flow/(Tn * flue gas flow to be measured)
Wherein Tx is the saturated vapor pressure under the temperature in the aqueous vapor place pipeline that separates, and Tn is the saturated vapor pressure under the temperature in the flue, and saturated vapour pressure is relevant with air pressure and temperature, and the saturated vapor pressure of different temperatures can be tabled look-up and be obtained, and no longer describes in detail.
As Fig. 1, the humidity translator 16 of measurement mechanism of the present invention comprises outer tube 1, inner tube 2 and humidity sensor 3, inner tube 2 is the Nafion drying tube, in the inner tube 2 is flue gas to be measured chamber A, be connected with process pipe 12, outer tube 1 constitutes aqueous vapor chamber B with inner tube 2, aqueous vapor chamber B and flue gas to be measured chamber A are separate, flue gas to be measured chamber A is provided with inlet a, outlet b, aqueous vapor chamber B are provided with inlet c, outlet d, humidity sensor 3 is arranged near the outlet d of aqueous vapor chamber B, and the inlet c of aqueous vapor chamber B connects dry source of the gas 20.
The flue gas flow that flue gas flow meter 18 to be measured is measured in the flue gas to be measured chamber A, the gas flow that aqueous vapor flowmeter 19 is measured in the aqueous vapor chamber B.
As Fig. 2, a specific embodiment for measurement mechanism of the present invention, 16 of process pipe 12 and humidity translators are provided with the smoke dust filtration fraction, comprise compressed gas source 10, solenoid valve 11, two heating temperature control devices 13 and filtrator 15, process pipe 12 connects the input of filtrator 15, compressed gas source 10 connects filtrator 15, and solenoid valve 11 is arranged between compressed gas source 10 and the filtrator 15, and compressed gas source 10 and solenoid valve 11 are used for the blowback of filtrator 15 from deashing; It is other that one heating temperature control device 13 is arranged on filtrator 15, another heating temperature control device 13 and flue gas flow meter 18 to be measured are arranged on the connecting path of filtrator 15 and the flue gas to be measured chamber A of humidity translator 16, the heating temperature control device is used for the heat and moisture preserving of gas transmission course, belongs to prior art and no longer describes in detail; Aqueous vapor flowmeter 19 is arranged between aqueous vapor chamber B and the dry source of the gas 20, and flue gas to be measured chamber A connects aspiration pump 17, and the outer tube 1 of humidity translator 16 is a stainless-steel tube.
The principle of measurement mechanism of the present invention is, the flue gas that will contain dust and corrosive gas is earlier extracted out in process pipe, filter out dust, then the moisture in the flue gas that does not contain dust is separated from flue gas, be separated to another independently in the dry air stream, in this stream, humidity sensor is installed, gas in the independent dry air stream of this moment is not contain dust and corrosive gas, only contain the moisture in the former flue gas to be measured, thereby solved the damage of dust and corrosive gas humidity sensor.
Since the Penetration Signature of Nafion pipe, CO, CO
2, SO
X, NO
X, O
2, N
2, HNO
3, H
2SO
4, H
2Exhaust gas components such as S, HCL, HF can not enter aqueous vapor chamber B by the Nafion pipe, and the gas that can permeate the Nafion pipe fully has only H
2O.
After the Nafion pipe is handled, in the aqueous vapor chamber:
Flue gas SO
2: 0mg/Nm
3
Flue gas NO
X: 0mg/Nm
3
Flue gas flue dust: 0mg/Nm
3
Specific implementation of the present invention is: former flue gas is through filtrator 15, dust-filtering in the flue gas is fallen, dustless flue gas is through flue gas flow meter 18 to be measured, arrive humidity translator 16, in humidity translator 16, dustless flue gas is entered in the flue gas to be measured chamber A by inlet a, and b leaves flue gas to be measured chamber A by outlet, be the Nafion drying tube, drain by aspiration pump 17.Dustless flue gas is in the Nafion drying tube process of flowing through, moisture in the flue gas is displaced in the B of aqueous vapor chamber by the Nafion drying tube, behind the pressure gas process aqueous vapor flowmeter 19 of dry source of the gas 20 with dry oil free, inlet c by aqueous vapor chamber B enters aqueous vapor chamber B, the moisture that displaces from flue gas to be measured chamber A in the B of aqueous vapor chamber is all taken to outlet d, and the humidity sensor 3 through being provided with, measure humidity after, d discharges through outlet.
Flow by strict controlled humidity flue gas flow meter 18 and aqueous vapor flowmeter 19 obtains flue gas flow and aqueous vapor flow, measure the humidity data of aqueous vapor chamber B, temperature in the flue can be oily the acquisition of CEMS system itself, the temperature that the humidity sensor 3 that is provided with in the B of aqueous vapor chamber also can be measured in the B of aqueous vapor chamber simultaneously, table look-up corresponding saturated vapour pressure value, by the relational expression of measuring method of the present invention, calculate through the backstage, get final product the humidity of flue gas to be measured.
Example: it is 1L/Min that flue gas flow meter 18 to be measured records flow, it is 2L/Min that aqueous vapor flowmeter 19 records flow, this moment humidity sensor 3 to record humidity value be 30%, it is identical with temperature in the B of aqueous vapor chamber to record flue, obtaining the interior smoke moisture of actual flue is 60%, realizes the on-line monitoring smoke moisture.
Proportionate relationship among the present invention between humidity, temperature and the gas flow is by experiment repeatedly, the environment of simulation certain value humidity under temperature constant state, with the gas of known humidity by measurement mechanism of the present invention, flow by controlling two flowmeters and measure in the flue and the temperature of aqueous vapor chamber B, and the aqueous vapor humidity of measuring aqueous vapor chamber B, coincide with the value of experiment known humidity by the data that relational expression of the present invention draws.
Principle of the present invention is; pass through Chalk-dust filtering; replace the way of measuring humidity behind the former flue gas moisture again; solve the problem of dust obstruction and gas attack; under the situation that does not break away from design philosophy of the present invention, any type of change that the present invention is made all should belong within protection scope of the present invention.
Claims (7)
1, a kind of humidity measuring method that is used for the CEMS system is characterized in that the moisture in the flue gas to be measured in the flue is separated in another pipeline that independently is connected with dry air by the Nafion drying tube, detects described ducted aqueous vapor humidity, by relational expression:
Smoke moisture to be measured=aqueous vapor humidity * Tx * aqueous vapor flow/(Tn * flue gas flow to be measured) obtains smoke moisture to be measured, and wherein Tx is the saturated vapor pressure under the temperature in the aqueous vapor place pipeline that separates, and Tn is the saturated vapor pressure under the temperature in the flue.
2, a kind of humidity measuring method that is used for the CEMS system according to claim 1 is characterized in that flue gas to be measured separates before the moisture, filters out the dust in the flue gas to be measured earlier.
3, a kind of humidity measuring instrument that is used for the CEMS system, be connected on the process pipe (12) of system, it is characterized in that comprising humidity translator (16), flue gas flow meter to be measured (18) and aqueous vapor flowmeter (19), humidity translator (16) comprises outer tube (1), inner tube (2) and humidity sensor (3), inner tube (2) is the Nafion drying tube, in the inner tube (2) is flue gas to be measured chamber (A), be connected with process pipe (12), outer tube (1) constitutes aqueous vapor chamber (B) with inner tube (2), aqueous vapor chamber (B) is separate with flue gas to be measured chamber (A), be respectively equipped with the gateway, humidity sensor (3) is arranged at aqueous vapor chamber (B), aqueous vapor chamber (B) connects dry source of the gas (20), flue gas flow meter to be measured (18) is arranged between flue gas to be measured chamber (A) and the process pipe (12), and aqueous vapor flowmeter (19) is arranged between aqueous vapor chamber (B) and the dry source of the gas (20).
4, a kind of humidity measuring instrument that is used for the CEMS system according to claim 3, it is characterized in that also being provided with the smoke dust filtration fraction between process pipe (12) and humidity translator (16), comprise compressed gas source (10), solenoid valve (11), two heating temperature control devices (13) and filtrator (15), process pipe (12) connects the input of filtrator (15), compressed gas source (10) connects filtrator (15), solenoid valve (11) is arranged between compressed gas source (10) and the filtrator (15), it is other that one heating temperature control device (13) is arranged on filtrator (15), and another heating temperature control device (13) and flue gas flow meter to be measured (18) are arranged on the connecting path in filtrator (15) and the flue gas to be measured chamber (A) of humidity translator (16).
5,, it is characterized in that flue gas to be measured chamber (A) connects aspiration pump (17) according to claim 3 or 4 described a kind of humidity measuring instruments that are used for the CEMS system.
6,, it is characterized in that the outer tube (1) of humidity translator (16) is stainless-steel tube according to claim 3 or 4 described a kind of humidity measuring instruments that are used for the CEMS system.
7, a kind of humidity measuring instrument that is used for the CEMS system according to claim 5 is characterized in that the outer tube (1) of humidity translator (16) is stainless-steel tube.
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|---|---|---|---|
| CN 200910027151 CN101561426B (en) | 2009-05-22 | 2009-05-22 | Humidity measuring method and measuring device used for CEMS system |
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|---|---|---|---|
| CN 200910027151 CN101561426B (en) | 2009-05-22 | 2009-05-22 | Humidity measuring method and measuring device used for CEMS system |
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| CN101561426B CN101561426B (en) | 2013-01-09 |
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| GB2490601A (en) * | 2011-05-05 | 2012-11-07 | Crowcon Detection Instr Ltd | Portable flue gas analysing unit with water-removing tube located in handle |
| CN104049074A (en) * | 2014-07-02 | 2014-09-17 | 江苏大学 | Method and device for estimating sludge moisture content in sludge drying process |
| CN104483182A (en) * | 2014-12-31 | 2015-04-01 | 江苏天瑞仪器股份有限公司 | Humidity control method and device for sampled gas |
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| CN106645598A (en) * | 2017-03-08 | 2017-05-10 | 上海灵湃测控技术有限公司 | Flue gas hygrometer |
| CN107884440A (en) * | 2017-11-28 | 2018-04-06 | 上海清如环保科技有限公司 | A kind of flue gas dew point detection means |
| CN108490117A (en) * | 2018-02-09 | 2018-09-04 | 青岛海尔智能技术研发有限公司 | Oven moisture measurement, control method and oven |
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| CN109839424A (en) * | 2017-11-27 | 2019-06-04 | 中国科学院大连化学物理研究所 | A kind of pre-treating method for the direct mass spectrography detection of pentane in expiratory air |
| CN114594805A (en) * | 2022-01-26 | 2022-06-07 | 青岛明华电子仪器有限公司 | Flue gas humidity control method based on Nafion pipe |
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| CN201122153Y (en) * | 2007-08-29 | 2008-09-24 | 黄国文 | Flue gas humidity detection apparatus |
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| GB2490601A (en) * | 2011-05-05 | 2012-11-07 | Crowcon Detection Instr Ltd | Portable flue gas analysing unit with water-removing tube located in handle |
| GB2490601B (en) * | 2011-05-05 | 2013-05-22 | Crowcon Detection Instr Ltd | Water removal in gas sensing equipment |
| CN104049074A (en) * | 2014-07-02 | 2014-09-17 | 江苏大学 | Method and device for estimating sludge moisture content in sludge drying process |
| CN104049074B (en) * | 2014-07-02 | 2016-01-20 | 江苏大学 | The evaluation method of sludge moisture content and device in a kind of mud drying process |
| CN104483182A (en) * | 2014-12-31 | 2015-04-01 | 江苏天瑞仪器股份有限公司 | Humidity control method and device for sampled gas |
| CN105987789A (en) * | 2015-02-03 | 2016-10-05 | 林海鸥 | Leak detection device for waste heat recovery heat exchanger |
| CN106645598A (en) * | 2017-03-08 | 2017-05-10 | 上海灵湃测控技术有限公司 | Flue gas hygrometer |
| CN109839424A (en) * | 2017-11-27 | 2019-06-04 | 中国科学院大连化学物理研究所 | A kind of pre-treating method for the direct mass spectrography detection of pentane in expiratory air |
| CN109839424B (en) * | 2017-11-27 | 2021-06-01 | 中国科学院大连化学物理研究所 | Pretreatment method for direct mass spectrometry detection of n-pentane in exhaled breath |
| CN107884440A (en) * | 2017-11-28 | 2018-04-06 | 上海清如环保科技有限公司 | A kind of flue gas dew point detection means |
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| CN109813457A (en) * | 2019-03-15 | 2019-05-28 | 杭州喜倍科技有限公司 | A kind of industry humiture instrument and its measuring method |
| CN114594805A (en) * | 2022-01-26 | 2022-06-07 | 青岛明华电子仪器有限公司 | Flue gas humidity control method based on Nafion pipe |
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