JP2005091226A - Method and apparatus for measuring amount of moisture in high-temperature gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an amount-of-moisture measurement method and an amount-of-moisture measuring apparatus of high-temperature gas that can continuously measure the amount of moisture in high-temperature corrosive gas. <P>SOLUTION: The amount-of-moisture measuring apparatus comprises an exhaust gas extraction tube 3 for extracting partial exhaust gas from an exhaust duct 2 of high-temperature corrosive gas; a fresh air introduction flow rate control valve 9 for performing mixing with the extraction exhaust gas, and controlling at least one of the extraction flow rate of gas to be measured and the introduction flow rate of the fresh air so that the temperature of the mixed gas decreases to a required moisture measurable temperature or smaller; an extraction flowmeter for measuring the extraction flow rate of the exhaust gases and the fresh air introduction flow rate; and a control computing unit 16 for measuring the temperature of the exhaust gas by a wet-bulb thermometer 15 and a dry-bulb thermometer 13, calculates amount of moisture Xwa in the mixed gas by using the humidity calculation expression of dry and wet bulbs, on the basis of the dry-bulb temperature and wet-bulb temperature, and calculates amount of moisture Xwb of the fresh air, Xwc of extraction gas to be measured, and an amount of moisture Xw of gas to be measured flowing through an exhaust duct. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for measuring the moisture content of a high-temperature gas, which is obtained by continuously measuring the moisture content in a high-temperature corrosive exhaust gas at 100 ° C. or higher, including chlorine gas discharged from an incinerator for industrial waste, etc. The present invention relates to a quantity measuring device.

  In general, an industrial waste incinerator or the like discharges high temperature corrosive exhaust gas containing chlorine gas or the like at 100 ° C. or higher.

  In such high-temperature corrosive exhaust gas, if the amount of water contained in the exhaust gas increases, the amount of hydrochloric acid produced by combining the water and chlorine increases. Various valves such as flow rate control valves and various measuring instruments such as thermometers are easily corroded by hydrochloric acid, and the life is likely to be shortened.

  In this type of incinerator for industrial waste, slaked lime is introduced into the exhaust gas to neutralize chlorine, which is the raw material of dioxins in the high temperature corrosive exhaust gas. When there is a large amount of slaked lime, the slaked lime is easily solidified in the exhaust duct or the like due to the moisture, which causes a problem that the exhaust duct or the like is easily clogged.

  Therefore, conventionally, the humidity (water content) of the hot corrosive exhaust gas is appropriately detected by a hygrometer, and the moisture generation amount is grasped as a characteristic of the incinerator. The humidity measurement of the high temperature corrosive exhaust gas is an operation that is practically performed in an industrial waste incinerator and is not described in the literature. Therefore, the humidity measurement of this exhaust gas is not described in the literature.

  At present, however, some thermometers are resistant to high temperatures and corrosion, but few hygrometers are resistant to high temperatures, and few have long-term resistance to corrosive gases.

  For this reason, conventionally, the humidity (moisture) of the hot corrosive gas can be measured only for a short time with a hygrometer and cannot be continuously measured.

  The present invention has been made in view of such circumstances, and its purpose is to provide a method for measuring the amount of water in a high temperature gas capable of continuously measuring the amount of water in the high temperature corrosive gas and the amount of water in the high temperature gas. It is to provide a measuring device.

  In the invention according to claim 1 of the present application, a step of extracting a required amount of gas to be measured from the flow path of the high-temperature corrosive gas to be measured to the extraction path, and introducing the outside air into the extraction path to the extracted gas to be measured Mixing and controlling at least one of the extraction flow rate of the gas to be measured and the introduction flow rate of outside air so that the temperature of the mixed gas falls below a required water measurable temperature, and the extraction flow rate of the extraction gas to be measured And the outside air introduction flow rate respectively, and the temperature of the mixed gas is measured with a wet bulb thermometer and a dry bulb thermometer, respectively, and the humidity calculation of the dry and wet bulb is performed based on the dry bulb temperature and the wet bulb temperature. A step of calculating a moisture amount Xwa in the mixed gas using an equation, a step of calculating a moisture amount Xwb in the outside air introduced into the extraction path from the introduced outside air temperature and humidity, and a moisture amount of the introduced outside air X a step of calculating a moisture amount Xwc in the extracted measured gas from a difference between b and a moisture amount Xwa of the mixed gas, and a measured amount of moisture Xwc in the extracted measured gas flowing through the measured gas channel And a step of calculating a moisture content Xw in the gas to be measured flowing through the flow path by gas flow rate conversion.

・次のSprung（スプルング）式（２）を用いて、上記混合ガスの水蒸気圧ｅａ（Ｐａ）を求めるステップ。

・次の式（３）により上記水蒸気圧ｅａ（Ｐａ）から外気と混合ガスとの混合比ｒａ（ｋｇ／ｋｇ）を求めるステップ。

・次の式（４）により上記混合ガスの流量Ｒ_２をｍ^３／ｈからｌ／ｍｉｎに換算した値に上記混合比ｒａを乗算して、混合ガス中の水分量Ｘｗａ（ｌ／ｍｉｎ）を求めるステップ。

The invention according to claim 2 of the present application is the method of measuring the moisture content of the high temperature gas according to claim 1, wherein the moisture content Xwa in the mixed gas is calculated by the following calculation step.
The step of obtaining the saturated water vapor pressure ew (Pa) of the mixed gas using the following Sonntag equation (1).

A step of obtaining the water vapor pressure ea (Pa) of the mixed gas using the following Sprung equation (2).

A step of obtaining a mixing ratio ra (kg / kg) between the outside air and the mixed gas from the water vapor pressure ea (Pa) by the following equation (3).

The amount of water Xwa (l / min) in the mixed gas is obtained by multiplying the value obtained by converting the flow rate R _{2 of the} mixed gas from m ³ / h to 1 / min by the following mixing ratio ra according to the following equation (4). Step to ask for.

・上記水蒸気圧ｅｂ（Ｐａ）から大気と混合ガスとの混合比ｒｂ（ｋｇ／ｋｇ）を次の式（６）により求めるステップ。

・上記導入外気の流量Ｒ_１をｍ^３／ｈからｌ／ｍｉｎに換算した値に、次の式（７）に示すように上記混合比ｒｂを乗算して、導入外気の水分量Ｘｗｂ（ｌ／ｍｉｎ）を求めるステップ。

The invention according to claim 3 of the present application is the method of measuring the moisture content of the high-temperature gas according to claim 1 or 2, wherein the moisture content Xwb in the introduced outside air is calculated by the following calculation step.
A step of obtaining the saturated water vapor pressure ew (Pa) of the introduced outside air using the Sonntag equation (1).
The step of obtaining the water vapor pressure eb (Pa) of the introduced outside air from the relative humidity data of the introduced outside air ew (Pa) and the outside air humidity H ₁ by the following equation (5).

A step of obtaining a mixing ratio rb (kg / kg) between the atmosphere and the mixed gas from the water vapor pressure eb (Pa) by the following equation (6).

The value obtained by converting the flow rate R _{1 of the} introduced outside air from m ³ / h to l / min is multiplied by the mixing ratio rb as shown in the following equation (7) to obtain the moisture content Xwb (l / Min).

・この抽出被測定ガス中の水分量Ｘｗｃを上記被測定ガスの流路における流量に換算して被測定ガス中の水分量Ｘｗ（％）を下記式（９），（１０）により求めるステップ。

The invention according to claim 4 of the present application is characterized in that the moisture amount Xwc in the extracted measurement gas is calculated by the following calculation step. It is a moisture content measuring method.
The step of obtaining the moisture amount Xwc (l / min) in the extracted measurement gas by the following equation (8) for obtaining the difference between the moisture amount Xwa in the mixed gas and the moisture amount Xwb in the introduced outside air.

The step of obtaining the moisture content Xw (%) in the measured gas by the following equations (9) and (10) by converting the moisture content Xwc in the extracted measured gas into the flow rate in the flow path of the measured gas.

  The invention according to claim 5 of the present application includes an extraction path for extracting a required amount of gas to be measured from the flow path of the high-temperature corrosive gas to be measured, an extraction flow rate control valve for controlling the extraction flow rate of the gas to be measured, Connected in the middle of the extraction path to introduce the outside air and mix it with the extracted gas to be extracted, the outside air introduction flow rate control valve for controlling the outside air introduction flow rate, and the temperature of the mixed gas allows a predetermined moisture measurement Control means for controlling the degree of opening of the extraction flow rate control valve and the outside air introduction flow rate control valve so that the temperature falls below the temperature, a flow meter for measuring the extraction flow rate of the extraction gas to be measured and the outside air introduction flow rate, respectively; The temperature of the mixed gas is measured with a wet bulb thermometer and a dry bulb thermometer, respectively, and based on the dry bulb temperature and wet bulb temperature, a moisture calculation formula of the dry and wet bulb is used to determine the amount of water Xwa in the mixed gas. Computing means for calculating The calculation means for calculating the moisture amount Xwb in the outside air introduced into the extraction path from the temperature and humidity of the introduced outside air, and the extraction target from the difference between the moisture amount Xwb of the introduced outside air and the moisture amount Xwa of the mixed gas. Calculation means for calculating the amount of moisture Xwc in the measurement gas, and the amount of moisture Xwc in the extracted measurement gas in the measurement gas flowing through this flow path by converting the flow rate of the measurement gas flowing through the measurement gas flow path. An apparatus for measuring the moisture content of a high-temperature gas, comprising: an arithmetic means for calculating a moisture content Xw.

  According to the present invention, the amount of water in the hot corrosive exhaust gas can be continuously measured and determined.

  Hereinafter, the best embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a system configuration diagram of the hot gas moisture content measuring apparatus 1. As shown in FIG. 1, a high-temperature gas moisture content measuring apparatus 1 is provided in the middle of an exhaust duct 2 through which exhaust gas which is high-temperature corrosive exhaust gas to be measured at 100 ° C. or higher containing chlorine gas discharged from an incinerator (not shown). The exhaust gas extraction pipe 3 is connected, and the exhaust gas extraction pipe 3 is provided with a suction blower 4, and a part of the exhaust gas flowing through the exhaust duct 2 is sucked into the exhaust gas extraction pipe 3 by the suction force of the suction blower 4 and extracted. And after the required exhaust treatment, it is discharged to the outside air.

  The exhaust gas extraction pipe 3 is connected to one end of the outside air introduction pipe 5 in the middle thereof. The outside air introduction pipe 5 is opened at the other end as the outside air introduction port 5a, and in the middle, the outside air introduction flow meter 6 for measuring the outside air introduction flow rate, and the introduction outside air thermometer 7 for detecting the introduction outside air temperature. In addition, a hygrometer for introducing outside air 8 for detecting the humidity of the introduced outside air and an outside air introduction flow rate control valve 9 including an electric valve for controlling the amount of outside air introduced are provided.

  The exhaust gas extraction pipe 3 is a high-temperature thermometer that detects the temperature of the extracted exhaust gas that is part of the exhaust gas extracted from the exhaust duct 2 to the exhaust gas extraction pipe 3 on the upstream side of the connection portion 10 with the outside air introduction pipe 5. 11. An extraction flow rate control valve 12 comprising an electric valve that controls the extraction flow rate of the extracted exhaust gas is provided.

  Further, the exhaust gas extraction pipe 3 includes a dry bulb thermometer 13 and a wet bulb thermometer 14 for detecting the temperature of the mixed gas of the extracted exhaust gas and the outside air between the outside air introduction pipe connecting portion 10 and the suction blower 4. A mixed gas flow meter 15 for detecting the gas flow rate is provided.

  The detection signal output terminals of the outside air introduction flow meter 6, the outside air thermometer 7, the outside air hygrometer 8, the high temperature thermometer 11, the dry bulb thermometer 13, the wet bulb thermometer 14, and the mixed gas flow meter 15. Is electrically connected to the detection signal input terminal of the control arithmetic unit 16 composed of a microprocessor or the like via a signal line indicated by a one-dot chain line in the figure, and the flow meters 6, 15 and the thermometers 7, 11, 13, 14, a detection value signal indicating a detection value detected by the hygrometer 8 is supplied to the control calculator 16.

  Further, the control arithmetic unit 16 has a function of performing on / off control of the operation of the suction blower 4 in accordance with an on / off operation of the suction blower 4 on an operation panel (not shown).

  Further, the control arithmetic unit 16 is electrically connected to an outside air introduction flow rate control valve 9 and an extraction flow rate control valve 12 which are motor-operated valves via a signal line indicated by a one-dot chain line in the figure, and these flow rate control valves 9, 12. The valve opening degree detection signal is received and the valve opening degree is detected, while the flow rate control valves 9 and 12 are remotely operated to control the valve opening degree.

  That is, the control arithmetic unit 16 adjusts the temperature of the mixed gas of the extracted exhaust gas and the outside air detected by the dry bulb thermometer 13 to a predetermined temperature that is 100 ° C. or less of the water measurable temperature, for example, 50 ° C. to 60 ° C. The extraction flow control valve 12 and the outside air introduction flow control valve 9 are remotely operated to have flow control valve control means for controlling the valve opening degree.

  Then, the control calculator 16 calculates the moisture amount Xwa in the mixed gas, the moisture amount Xwb in the introduced outside air, the moisture amount Xwc in the extracted exhaust gas, and the moisture amount Xw in the exhaust gas flowing in the exhaust duct 2 respectively. Have

  That is, the moisture amount calculation means in the mixed gas receives the temperature detection signals from the wet bulb thermometer 14 and the dry bulb thermometer 13 and then calculates the moisture amount Xwa in the mixed gas of the extracted exhaust gas and the introduced outside air. It is calculated by executing the calculation step.

The step of obtaining the saturated water vapor pressure ew (Pa) of the mixed gas using the following Sonntag equation (1).

A step of obtaining the water vapor pressure ea (Pa) of the mixed gas using the following Sprung equation (2).

A step of obtaining a mixing ratio ra (kg / kg) between the outside air and the mixed gas from the water vapor pressure ea (Pa) by the following equation (3).

The amount of water Xwa (l / min) in the mixed gas is obtained by multiplying the value obtained by converting the flow rate R _{2 of the} mixed gas from m ³ / h to 1 / min by the following mixing ratio ra according to the following equation (4). Step to ask for.

  Further, the control calculator 16 calculates the moisture amount Xwb in the introduced outside air by executing the next calculation step.

A step of obtaining the saturated water vapor pressure ew (Pa) of the introduced outside air using the Sonntag equation (1).
The step of obtaining the water vapor pressure eb (Pa) of the introduced outside air from the relative humidity data of the introduced outside air ew (Pa) and the outside air humidity H ₁ by the following equation (5).

A step of obtaining a mixing ratio rb (kg / kg) between the atmosphere and the mixed gas from the water vapor pressure eb (Pa) by the following equation (6).

The value obtained by converting the flow rate R _{1 of the} introduced outside air from m ³ / h to l / min is multiplied by the mixing ratio rb as shown in the following equation (7) to obtain the moisture content Xwb (l / Min).

  Further, the control calculator 16 calculates the moisture amount Xwc in the introduced outside air by executing the next calculation step.

The step of obtaining the moisture amount Xwc (l / min) in the extracted exhaust gas by the following equation (8) for obtaining the difference between the moisture amount Xwa in the mixed gas and the moisture amount Xwb in the introduced outside air.

The step of obtaining the moisture content Xw (%) in the exhaust gas by the following formulas (9) and (10) by converting the moisture content Xwc in the extracted exhaust gas into the flow rate in the exhaust gas flow path.

  Next, the operation of the high temperature gas moisture content measuring apparatus 1 configured as described above will be described.

  First, when the suction blower 4 is turned on with the operation panel during the operation of the incinerator (not shown), the suction blower 4 is operated and the exhaust extraction pipe 3 is exhausted to become negative pressure. A part of the high temperature corrosive exhaust gas flowing inside is sucked into the exhaust extraction pipe 3 and extracted as an extracted exhaust gas. At this time, part of the outside air is sucked into the exhaust gas extraction pipe 3 through the outside air introduction pipe 5 from the outside air introduction port 5a.

  For this purpose, the introduced outside air is mixed with the extracted exhaust gas in the exhaust gas extraction pipe 3, and after being subjected to a required purification process such as cooling or dust removal by an exhaust gas treatment system (not shown) as a mixed gas, it is discharged again to the outside air.

  By the way, the temperature of the mixed gas is detected by the dry bulb thermometer 13 and the wet bulb thermometer 14, and the detected temperature signal is given to the control arithmetic unit 16 via a signal line indicated by a one-dot chain line in the figure.

  Therefore, the control computing unit 16 can measure the humidity in the mixed gas, that is, the amount of moisture by using the wet bulb thermometer 14 as the temperature detection value of the dry bulb thermometer 13, for example, a water measurable temperature of 100 ° C. or less, for example 50 These valve openings are controlled by remote operation of the extracted exhaust gas flow rate control valve 12 and the outside air introduction flow rate control valve 9 so as to be in the range of 60 ° C to 60 ° C.

  At this time, each temperature detection value signal detected by the high temperature thermometer 11, the introduced outside air thermometer 7, the dry bulb thermometer 13 and the wet bulb thermometer 14 is controlled through a signal line indicated by a one-dot chain line in the figure. Is provided to the container 16.

  In addition, the control computing unit 16 includes a humidity detection value signal of the introduced outside air hygrometer 8, an outside air introduction flow rate detection value signal and a mixed gas flow rate detection signal detected by the outside air introduction flow meter 6 and the mixed gas flow meter 15, respectively. It is input via a signal line indicated by a one-dot chain line in the figure.

  Therefore, the control calculator 16 calculates the moisture amounts Xwa, Xwb, and Xwc respectively contained in the extracted exhaust gas, the introduced outside air, and the mixed gas thereof by the above-described calculating means, and further, the moisture amounts Xwa, Xwb, Based on Xwc, the amount of water Xw contained in the hot corrosive exhaust gas flowing in the exhaust duct 2 is calculated.

  Therefore, according to the moisture content measuring apparatus 1 of this high-temperature gas, the outside air is mixed with a part of the high-temperature corrosive exhaust gas extracted into the extraction exhaust pipe 3 (extracted exhaust gas). The temperature can be lowered while diluting. For this reason, it is possible to lower the temperature to a temperature at which moisture measurement by the dry bulb thermometer 13 and the wet bulb thermometer 14 is possible (for example, a predetermined temperature of 100 ° C. or less) without causing condensation in the extracted exhaust gas. The water content can be measured continuously.

  Also, instead of directly measuring the moisture content (humidity) in the high temperature corrosive exhaust gas in the exhaust duct 2 through which the high temperature corrosive exhaust gas flows, a part of the high temperature corrosive exhaust gas is measured. Since it is extracted into the exhaust gas extraction pipe 3 and diluted with outside air, the moisture content of the entire hot corrosive exhaust gas is obtained by calculation based on both the temperature detection values of the dry bulb thermometer 13 and the wet bulb thermometer 14. The dry bulb thermometer 13 and the wet bulb thermometer 14 do not need to be expensive and have high corrosion resistance and heat resistance, so that the cost can be reduced and the dry and wet bulb thermometers 14 and 13 Life can be extended.

  FIG. 2 is a system configuration showing an example of a combustion apparatus 20 to which the high-temperature gas moisture content measuring apparatus 1 is applied. In this combustion apparatus 20, for example, a high-temperature corrosive exhaust gas containing chlorine gas at 100 ° C. or higher is discharged from an exhaust gas outlet of an incinerator 21 that incinerates waste, and a chimney 23 is connected to the exhaust gas outlet by an exhaust duct 22. Yes.

  In the middle of the exhaust duct 22, a dust removing device 27 including a hot water cooling tower 24, an air cooling tower 25, a slaked lime feeder 26, a bag filter, and a suction fan 28 are provided from the incinerator 21 side toward the downstream side. They are inserted sequentially.

  Therefore, the high temperature corrosive exhaust gas discharged from the incinerator 21 to the exhaust duct 22 is sucked by the suction fan 28 and guided by the exhaust duct 22 and is sequentially cooled through the hot water cooling tower 24 and the air cooling tower 25 before dust removal. Slaked lime is introduced by the device 27, and chlorine gas which is a raw material of dioxins in the exhaust gas is neutralized, and then dust is removed by a dust removing element such as a bag filter and discharged from the chimney 23 to the outside air.

  The exhaust gas extraction pipe 3 of the hot gas moisture content measuring device 1 is connected to a part of the exhaust duct 22 connecting the dust removing device 27 and the suction fan 28 to measure the hot gas moisture content. The device 1 can be used.

  Thereby, the moisture content in the high temperature corrosive exhaust gas discharged from the incinerator 21 can be continuously measured by the high temperature gas moisture content measuring device 1 at low cost and with high accuracy.

  Further, by continuously measuring the amount of water in the high temperature corrosive exhaust gas, by operating the combustion device 20 so that the amount of water does not increase beyond a predetermined value, slaked lime introduced into the exhaust gas is contained in the exhaust gas. It is possible to prevent clogging from occurring in the exhaust duct 22 due to solidification by the moisture.

  Moreover, since the amount of hydrochloric acid produced by the combination of chlorine gas and moisture in the exhaust gas can be suppressed by suppressing the amount of moisture in the exhaust gas, piping such as the exhaust duct 22 of the combustion device 20 Corrosion of the valves, the hot water cooling tower 24, the air cooling tower 25, the dust removing device 27, the chimney 23, etc. can be reduced, and the life of these devices can be extended.

  In the high-temperature gas moisture content measuring apparatus 1 shown in FIG. 1, various measuring devices such as an outside air introduction flow meter 6, a mixed gas flow meter 15, an outside air introduction hygrometer 8, and various flow rate control valves 9 and 12 are controlled. Although the arithmetic unit 16 is connected with the signal line, these may be configured to be connected wirelessly.

  In addition, various detection signals from the various measuring devices 6 to 8, 11, 13, 147 and various signals from the various flow control valves 9, 12 and the suction blower 4 respectively input to the control arithmetic unit 16 are supplied to the control arithmetic unit. Along with the above 16 calculation results, a transmission device (not shown) is transmitted to a computer such as a management server of the monitoring center so that a plurality of combustion devices 20, 20. Also good.

  According to this, the operation of the plurality of combustion devices 20 can be remotely monitored by the computer of the monitoring center.

The line | wire system block diagram of the moisture content measuring apparatus of the hot gas which concerns on one Embodiment of this invention. The line | wire system block diagram of an example of the combustion apparatus with which the moisture content measuring apparatus of the hot gas shown in FIG. 1 is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High temperature gas moisture content measuring apparatus 2 Exhaust duct 3 Exhaust gas extraction pipe 4 Suction blower 5 Outside air introduction pipe 6 Outside air introduction flow meter 7 Outside air introduction thermometer 8 Outside air introduction hygrometer 9 Outside air introduction flow control valve 11 High temperature thermometer 12 Extraction flow rate Control valve 13 Dry bulb thermometer 14 Wet bulb thermometer 15 Mixed gas flow control valve 16 Control calculator 20 Combustion device 21 Incinerator 22 Exhaust duct 24 Hot water cooling tower 25 Air cooling tower 26 Slaked lime charging machine 27 Dust removal device 28 Suction fan

Claims (5)

Extracting a required amount of measured gas from the flow path of the hot corrosive measured gas into the extraction path;
Outside air is introduced into the extraction path and mixed with the extracted measurement gas, and at least the extraction flow of the measurement gas and the introduction flow of the outside air are reduced so that the temperature of the mixed gas falls below a required water measurable temperature. Controlling one, and
Measuring the extraction flow rate and the outside air introduction flow rate of the extraction measurement gas,
The temperature of the mixed gas is measured with a wet bulb thermometer and a dry bulb thermometer, respectively, and based on the dry bulb temperature and wet bulb temperature, a moisture calculation formula of the dry and wet bulb is used to determine the amount of water Xwa in the mixed gas. Calculating steps,
Calculating the moisture content Xwb in the outside air introduced into the extraction path from the introduced outside air temperature and humidity;
Calculating the moisture content Xwc in the extracted measurement gas from the difference between the moisture content Xwb of the introduced outside air and the moisture content Xwa of the mixed gas;
Calculating the moisture amount Xw in the measurement gas flowing through the flow path by converting the moisture amount Xwc in the extracted measurement gas into a flow rate of the measurement gas flowing through the measurement gas flow path;
A method for measuring the moisture content of a high-temperature gas, comprising: 2. The method for measuring the moisture content of a high-temperature gas according to claim 1, wherein the moisture content Xwa in the mixed gas is calculated by the following calculation step.
The step of obtaining the saturated water vapor pressure ew (Pa) of the mixed gas using the following Sonntag equation (1).

A step of obtaining the water vapor pressure ea (Pa) of the mixed gas using the following Sprung equation (2).

A step of obtaining a mixing ratio ra (kg / kg) between the outside air and the mixed gas from the water vapor pressure ea (Pa) by the following equation (3).

The amount of water Xwa (l / min) in the mixed gas is obtained by multiplying the value obtained by converting the flow rate R _{2 of the} mixed gas from m ³ / h to 1 / min by the following mixing ratio ra according to the following equation (4). Step to ask for.

The method for measuring the moisture content of a high-temperature gas according to claim 1 or 2, wherein the moisture content Xwb in the introduced outside air is calculated by the following calculation step.
A step of obtaining the saturated water vapor pressure ew (Pa) of the introduced outside air using the Sonntag equation (1).
The step of obtaining the water vapor pressure eb (Pa) of the introduced outside air from the relative humidity data of the introduced outside air ew (Pa) and the outside air humidity H ₁ by the following equation (5).

A step of obtaining a mixing ratio rb (kg / kg) between the atmosphere and the mixed gas from the water vapor pressure eb (Pa) by the following equation (6).

The value obtained by converting the flow rate R _{1 of the} introduced outside air from m ³ / h to l / min is multiplied by the mixing ratio rb as shown in the following equation (7) to obtain the moisture content Xwb (l / Min).

The method for measuring the moisture content of a high-temperature gas according to any one of claims 1 to 3, wherein the moisture content Xwc in the extracted gas to be measured is calculated by the following calculation step.
The step of obtaining the moisture amount Xwc (l / min) in the extracted measurement gas by the following equation (8) for obtaining the difference between the moisture amount Xwa in the mixed gas and the moisture amount Xwb in the introduced outside air.

The step of obtaining the moisture content Xw (%) in the measured gas by the following equations (9) and (10) by converting the moisture content Xwc in the extracted measured gas into the flow rate in the flow path of the measured gas.

An extraction path for extracting a required amount of gas to be measured from the flow path of the gas to be measured at high temperature corrosiveness,
An extraction flow rate control valve for controlling the extraction flow rate of the gas to be measured;
An outside air introduction path connected in the middle of this extraction path to introduce the outside air and mix it with the extracted measurement gas; and
An outside air introduction flow rate control valve for controlling the outside air introduction flow rate,
Control means for controlling the degree of opening of the extraction flow rate control valve and the outside air introduction flow rate control valve so that the temperature of the mixed gas falls below a predetermined water measurable temperature;
A flow meter for measuring the extraction flow rate and the outside air introduction flow rate of the extraction measurement gas,
The temperature of the mixed gas is measured with a wet bulb thermometer and a dry bulb thermometer, respectively, and based on the dry bulb temperature and wet bulb temperature, a moisture calculation formula of the dry and wet bulb is used to determine the amount of water Xwa in the mixed gas. Computing means for calculating
Computing means for calculating the amount of moisture Xwb in the outside air introduced into the extraction path from the temperature and humidity of the introduced outside air;
A calculation means for calculating a moisture amount Xwc in the extracted measurement gas from a difference between the moisture amount Xwb of the introduced outside air and the moisture amount Xwa of the mixed gas;
A calculation means for calculating the moisture amount Xw in the measurement gas flowing through the flow path by converting the moisture amount Xwc in the extracted measurement gas into a flow rate of the measurement gas flowing through the measurement gas flow path;
A device for measuring the moisture content of a high-temperature gas, comprising:

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