JP2012211774A - Device and method for detecting sodium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for detecting sodium, the device having a high accuracy for detecting sodium with simple facilities.SOLUTION: A sodium detection device 1 comprises: a plurality of sampling pipes 3 for collecting a sampling gas 21; a plurality of ion type measuring instruments 4 disposed in each of a plurality of the sampling pipes; an ion type sodium concentration calculating device 10 for calculating a sodium concentration in a plurality of the sampling gases 21 as the calculation results 32 of the ion type sodium ion concentration; a merging pipe 6 for mixing a plurality of the sampling gases 21 to form a mixed gas 22; a laser type measuring instrument 7 disposed in the merging pipe 6; a laser type sodium concentration calculating device 11 for calculating a sodium concentration in the mixed gas 22 as the calculation results 34 of the ion type sodium concentration; and an alarm determination device 12 for determining that sodium is contained in the sampling gas 21 when the calculation results 32 of the ion type sodium ion concentration and the calculation results 34 of the laser type sodium concentration are higher than a threshold value for detecting sodium.

Description

  The present invention relates to a sodium detector that detects sodium in a sampling gas.

  In sodium handling facilities such as fast reactor plants, if sodium leakage occurs, there is a possibility of damage to plant cooling or equipment in the facility, so it is necessary to detect leaked sodium early. There is. At present, as a means for detecting sodium, an ion measuring instrument is generally used as a gas sampling type.

  When sodium leakage occurs, sodium floats in the air as a sodium aerosol. The gas containing this sodium aerosol is collected as a sampling gas and introduced into an ion measuring device. The ion type measuring device includes an ion source that generates ions and an ion current measuring device that measures an ion current. The ion source supplies ions to the sampling gas and adsorbs the ions to the sodium aerosol. Of the ions supplied from the ion source, residual ions that have not been adsorbed to the sodium aerosol are introduced into the ion current measuring device.

  The ion current measuring device applies a voltage to an internal electrode, and only residual ions are attracted to the electrode and measured as an ion current. Calculate the difference between the measured ionic current and the reference current value as the amount of decrease in the ionic current due to the adsorption of ions to sodium, using the ionic current when measuring the calibration gas that does not contain sodium as the reference current value. The sodium concentration is calculated by multiplying by the concentration conversion count.

  However, since ions supplied from the ion source are also adsorbed to aerosols other than sodium aerosol, when the sampled gas contains aerosols other than sodium aerosol, the ion current decreases and sodium is detected incorrectly. There is a possibility of doing. Furthermore, since the ion measuring instrument is easily affected by environmental factors such as temperature and pressure, there is a possibility of erroneous detection or erroneous detection.

  Therefore, in addition to the ion measuring instrument, a laser measuring instrument that detects sodium by irradiating a sampling gas with infrared laser light to excite sodium and measuring the amount of light emitted when sodium transitions to the ground state. And a technique for operating the laser-type measuring device when sodium is detected in the ion-type measuring device and confirming sodium detection of the ion-type measuring device has been developed (for example, see Patent Document 1).

JP 2010-160062 A

  However, although the technique described in Patent Document 1 described above includes sodium in the sampling gas, the ion measuring instrument is sodium due to the influence of environmental factors such as temperature and pressure, or failure of the ion measuring instrument. When no is detected, there is a problem that sodium cannot be detected as a whole device because the measurement with the laser measuring instrument is not performed. Furthermore, since the configuration of the laser measuring instrument is more complicated than that of the ion measuring instrument, providing one laser measuring instrument for one ion measuring instrument has led to an increase in equipment.

  Then, an object of this invention is to provide the sodium detection apparatus with high precision of sodium detection with simple equipment.

  In order to achieve the above object, the sodium detector of the present invention is provided in each of a plurality of sampling pipes that collect sampling gas from a sampling port and a plurality of sampling pipes, and supplies ions to the sampling gas from an ion source. A plurality of ion-type measuring devices that measure the residual ions as current measurement values, receive current measurement values from the plurality of ion-type measurement devices, and further use a reference current value and a concentration conversion count. An ionic sodium concentration calculation device that calculates the sodium concentration in each sampling gas as an ionic sodium concentration calculation result, and a merging pipe that joins a plurality of sampling pipes and mixes the sampling gases into a mixed gas Provided in this merging pipe and excited by irradiating the mixed gas with a laser. A laser-type measuring device that measures the amount of light emitted when the gas transitions from the excited state to the ground state as a light-emitting amount measurement value, and receives the light-emitting amount measurement value from this laser-type measuring device. Laser type sodium concentration calculation device that calculates the sodium concentration in the gas mixture as the laser type sodium concentration calculation result using the data, and receives the ionic type sodium concentration calculation result from the ionic type sodium concentration calculation unit. The sampling gas contains sodium by receiving the laser-type sodium concentration calculation result from the sodium concentration calculation device, and the ionic-type sodium concentration calculation result and the laser-type sodium concentration calculation result exceeding the predetermined sodium detection threshold value, respectively. And an alarm judgment device for judging

  Furthermore, the sodium detection method of the present invention includes a step of collecting sampling gases at a plurality of sodium detection points from the sampling ports of the sampling pipes, and an ion source provided by each of the plurality of sampling pipes. The ion is supplied to the sampling gas and ionized, and the residual ions are measured as current measurement values, and the current measurement values are received from a plurality of ion measuring instruments, and the sodium concentrations in the plurality of sampling gases are each measured by the ion formula. The step of calculating as a sodium concentration calculation result, the step of mixing sampling gas into a mixed gas in a merged pipe obtained by merging a plurality of sampling pipes, and the laser gas measuring instrument provided in the merged pipe are used to laser the mixed gas. And the mixed gas transitions from the excited state to the ground state. A step of measuring the amount of emitted light as a measured amount of emitted light, a step of receiving a measured amount of emitted light from a laser-type measuring device, and calculating a sodium concentration in the mixed gas as a laser-type sodium concentration calculation result, and an ionic type An ionic sodium concentration calculation result is received from the sodium concentration calculation device, and a laser sodium concentration calculation result is received from the laser sodium concentration calculation device, and the ionic sodium concentration calculation result and the laser sodium concentration calculation result are respectively set to predetermined values. And a step of determining that sodium is contained in the sampling gas by exceeding a sodium detection threshold value.

  ADVANTAGE OF THE INVENTION According to this invention, sodium in sampling gas can be detected accurately with the sodium detection apparatus of simple equipment.

1 is a schematic view of a sodium detection device according to a first embodiment of the present invention. Schematic of the sodium detection apparatus which concerns on the 2nd Embodiment of this invention. Schematic of the sodium detection apparatus which concerns on the 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below.

(First embodiment)
(Constitution)
Hereinafter, a sodium detection device according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic view of a sodium detection device according to the first embodiment of the present invention. The sodium detection device 1 includes a plurality of sampling ports 2, the same number of sampling pipes 3 as the sampling ports 2, the same number of ion measuring instruments 4 as the sampling ports 2, header pipes 5, merge pipes 6, and laser measurement. A gas analyzer 8, a calibration gas pipe 8, a calibration gas stop valve 9, an ionic sodium concentration calculation device 10, a laser sodium concentration calculation device 11, an alarm determination device 12, and an alarm device 13. The

  Hereinafter, the connection relationship of the structure of the sodium detector 1 will be described. The plurality of sampling ports 2 are devices that are provided at each of the plurality of sodium detection locations and can collect the sampling gas 21 from the opening. One end of the sampling pipe 3 is connected to each of the plurality of sampling ports 2 so that each of the sampling gas 21 collected by the plurality of sampling ports 2 can be introduced into the sampling pipe 3 and circulated.

  The other end of the sampling pipe 3 is branched into 3a and 3b, and the other end 3a of the sampling pipe 3 and the ionic measuring instrument so that the internal sampling gas 21 can be introduced into the ionic measuring instrument 4. 4 is connected. Further, the other ends 3 b of the plurality of sampling pipes 3 and the header pipe 5 are connected so that the sampling gas 21 in the plurality of sampling pipes 3 can be introduced into one header pipe 5.

  The calibration gas pipe 8 is a pipe through which the calibration gas 23 can be introduced from the outside. The sampling pipe 3 and the calibration gas pipe 8 are connected so that the calibration gas 23 can be introduced into the sampling pipe 3 upstream from the branch position of the other ends 3 a and 3 b of the sampling pipe 3. Further, the calibration gas pipe 8 is provided with a calibration gas stop valve 9 that can block the introduction of the calibration gas 23 into the sampling pipe 3.

  The header pipe 5 is a device that can mix the sampling gas 21 introduced from the plurality of sampling pipes 3 into the mixed gas 22. The header pipe 5 is connected to one end of the header pipe 5 and the joining pipe 6 so that the mixed gas 22 can be introduced into the joining pipe 6. Further, the joining pipe 6 is connected to the other end of the joining pipe 6 and the laser measuring instrument 7 so that the mixed gas 22 can be introduced into the laser measuring instrument 7.

  Further, the plurality of ion measuring devices 4 and the ion sodium concentration calculating device 4 can transmit the measured current values 31 measured in each to the ionic sodium concentration calculating device 10. 10 are connected. Further, the laser type measuring device 7 and the laser type sodium concentration calculating device 11 are connected so that the laser type measuring device 7 can transmit the measured light emission amount measurement value 33 to the laser type sodium concentration calculating device 11. .

  Further, the ionic sodium concentration calculation device 10 and the alarm determination device 12 are connected so that the ionic sodium concentration calculation device 10 can transmit the calculated ionic sodium concentration calculation result 32 to the alarm determination device 12. . Furthermore, the laser-type sodium concentration calculation device 11 and the alarm determination device 12 are connected so that the laser-type sodium concentration calculation device 11 can transmit the calculated laser-type sodium concentration calculation result 34 to the alarm determination device 12. . Further, the alarm determination device 12 and the alarm device 13 are connected so that the alarm determination device 12 can transmit the alarm determination signal 35 to the alarm device 13.

(Function)
The operation of the first embodiment of the present invention will be described below. The plurality of sampling ports 2 collect the sampling gas 21 from the opening at each of the sodium detection locations. Each sampling gas 21 collected from the plurality of sampling ports 2 circulates within the sampling pipe 3 connected to each of the plurality of sampling ports 2.

  The ionic measuring instrument 4 introduces the sampling gas 21 from the other end 3 a of the sampling pipe 3 and measures a current measurement value 31 used for calculating the sodium concentration in the ionic sodium concentration calculating device 10. One form of the ion measuring device 4 includes an ion source that generates ions using an α-ray source and an ion current measuring device that measures the amount of ions from the ion source as an ion current. When sodium leaks, sodium floats in the air as a sodium aerosol. The gas containing the sodium aerosol is sampled and introduced into the ion measuring device 4.

  Ions generated from the ion source are adsorbed on the sodium aerosol, and the sodium aerosol on which the ions are adsorbed and the residual ions not adsorbed on the sodium aerosol are introduced into the ion current measuring device. In the ion current measuring instrument, among the sodium aerosol and residual ions adsorbed by the ions, the residual ions are attracted to the electrode and measured as a current measurement value 31.

The ion measuring instrument 4 transmits the current measurement value 31 to the ion sodium concentration calculation device 10. The ionic sodium concentration calculation device 10 receives the current measurement value 31, and uses the following equation (1) to calculate the concentration of the difference between I _L (pA), which is the current measurement value 31, and the reference current I _b (pA). By multiplying the conversion factor A ((g / cm ³ ) / pA), N (g / cm ³ ) which is the ionic sodium concentration calculation result 32 is calculated. Here, the reference current Ib is a current measurement value 31 measured at the background level. The background level, to a sodium concentration of 0 g / cm ³ not refer to a small value of 0 g / cm ³ near.

N = − (I _L −I _b ) × A (1)
The ionic sodium concentration calculation device 10 transmits the calculated sodium concentration as the ionic sodium concentration calculation result 32 to the alarm determination device 12. The ion type measuring instrument 4 in the RID format detects the residual ions described above as a voltage value instead of a current value, and the current measured value of the above formula (1) in the ionic type sodium concentration calculation device 10. calculates the sodium concentration by conversion to the replaced equation I _L and the reference current I _b and the concentration conversion factor a is 31 to a voltage value.

  The header pipe 5 introduces a sampling gas 21 from the other ends 3 b of the plurality of sampling pipes 3 and mixes the sampling gas 21 as a mixed gas 22. The mixed gas 22 is introduced into the laser type measuring instrument 7 through the junction pipe 6. Hereinafter, the operation of the laser type measuring device 7 will be described. The laser measuring instrument 7 performs an air breakdown that irradiates the sampling gas 21 with an infrared laser beam to form plasma, and atomizes sodium in a plasma state to excite energy. The amount of light (wavelength 589 nm) when this energy-excited sodium transitions to the ground state is measured as a light emission amount measurement value 33, and the light emission amount measurement value 33 is transmitted to the laser-type sodium concentration calculator 11. Since the amount of light emitted by sodium is proportional to the atomic weight, the sodium concentration can be determined using the light emission amount measurement value 33.

  When the laser-type sodium concentration calculation device 11 receives the light emission amount measurement value 33, the sodium concentration in the sampling gas 21 is calculated as the laser-type sodium concentration calculation result 34 using the sodium amount data with respect to the light emission amount obtained and stored in advance. And transmitted to the alarm discrimination device 12.

  The alarm determination device 12 receives the ionic sodium concentration calculation result 32 from the ionic sodium concentration calculation device 10 and further receives the laser sodium concentration calculation result 34 from the laser sodium concentration calculation device 11. The alarm determination device 12 stores in advance the sodium detection threshold values for the ionic sodium concentration calculation result 32 and the laser sodium concentration calculation result 34, and the ionic sodium concentration calculation result 32 and the laser sodium concentration calculation result 34 are When each exceeds the sodium detection threshold value, it is determined that sodium is contained in the sampling gas 21, and an alarm determination signal 35 for generating an alarm related to sodium detection is transmitted to the alarm device 13. When the alarm device 13 receives the alarm determination signal 35, the alarm device 13 notifies the operator that sodium has been detected in the sampling gas 21 using an alarm or a display monitor.

  At this time, the alarm discriminating apparatus 12 includes information indicating the ionic measurement device 4 in which the ionic measurement value 31 of the plurality of ionic measurement devices 4 exceeds the sodium detection threshold, and the ionic sodium concentration calculation result 32. Alternatively, the sodium concentration indicated by the laser-type sodium concentration calculation result 34 may be added to the alarm determination signal 35 and displayed or stored in the alarm device 13.

  Hereinafter, an operation in the case where the ionic sodium concentration calculation result 32 is different from the true sodium concentration due to environmental factors such as temperature and pressure of the ionic measuring device 4 or failure of the ionic measuring device 4 will be described. At this time, the laser detector 7 operates normally, and the laser sodium concentration calculation result 34 indicates the sodium concentration in the true sampling gas 21. The operation when the laser detector 7 is abnormal will be described later.

  First, a case will be described in which, even though the true sodium concentration exceeds the sodium detection threshold value, the ionic sodium concentration calculation result 32 falls below the sodium detection threshold value, and the alarm detection device 12 does not erroneously determine sodium detection. . At this time, since the laser sodium concentration calculation result 34 indicates the true sodium concentration, the alarm determination device 12 determines that sodium detection is performed when the laser sodium concentration calculation result 34 exceeds the sodium detection threshold value. As a whole system, sodium detection errors are prevented.

  Furthermore, the abnormality determination device 12 can transmit information indicating that sodium is detected only for the laser-type sodium concentration calculation result 34 to the alarm device 13 and cause the alarm device 13 to display the information. Furthermore, you may add the information which shows that there exists a failure etc. concerning a detection mistake in either of the some ion measuring instruments 4.

  Further, a case will be described in which, even though the true sodium concentration is the background level, the ionic sodium concentration calculation result 32 exceeds the sodium detection threshold value, and the alarm detection device 12 makes an erroneous determination of sodium detection. . At this time, the laser-type sodium concentration calculation result 34 indicates that the background level is a true sodium concentration, so that the laser-type sodium concentration calculation result 34 falls below the sodium detection threshold value in the alarm discriminating apparatus 12 and the sodium detection result. No determination is made and sodium misdetection is prevented as a whole system of the sodium detector 1.

  At this time, the abnormality determination device 12 adds information indicating that sodium is not detected only for the laser-type sodium concentration calculation result 34 to the alarm determination signal 35 and transmits the information to the alarm device 13, and sends this to the alarm device 13. Can be displayed. Furthermore, you may add the information which shows that there exists abnormality regarding a misdetection, etc. in either of several ion type measuring devices 4. FIG.

  Further, the operation when the laser detector 7 is abnormal will be described. All of the plurality of ionic sodium concentration calculation results 32 by the plurality of ion measuring devices 4 exceed the sodium detection threshold value to determine sodium detection, and the laser sodium concentration calculation result 34 falls below the sodium detection threshold value to detect sodium. When it is not determined, it can be determined that the laser type measuring instrument 7 has an abnormality. At this time, this information may be added to the alarm determination signal 35 and displayed on the alarm device 13. Further, the laser type measuring device 7 may perform abnormality determination by measuring the amount of infrared laser light or measuring simulated excitation light.

  Finally, a method for calibrating the ion detector 4 using the calibration gas 23 will be described. At this time, the sampling gas 21 is not collected from the sampling port 2, the calibration gas 23 is introduced into the calibration gas pipe 8, and the calibration gas stop valve 9 is opened, whereby the ion measuring device 4. The calibration gas 23 is measured.

The calibration gas 23 is a gas whose sodium concentration is guaranteed in advance. For example, a sodium concentration of by using a calibration gas 23 is the background level, it is possible to calibrate the reference current I _b. Since the reference current I _b is the current measurement value 31 measured at the background level as expressed by the above-described equation (1), the ion measuring device 4 is caused to measure the calibration gas 23 that is the background level. the current measurement value 31 to be measured compared to the reference current I _b when, when the current measurement value 31 is different from the reference current I _b, the calibration of the reference current Ib by matching the reference current I _b to the current measurement value 31 It can be performed.

(effect)
According to the first embodiment of the present invention, the ionic sodium concentration calculation result 32 calculated by the plurality of ionic measurement devices 4 and the ionic sodium concentration calculation device 10, the laser measurement device 7 and the laser sodium concentration calculation. By performing sodium detection using the laser-type sodium concentration calculation result 34 calculated by the apparatus 11, it is possible to improve the accuracy of determination of sodium detection in the plurality of sampling gases 21.

  Further, when the determination result of the sodium detection differs between the ionic sodium concentration calculation result 32 and the laser sodium concentration calculation result 34, the plurality of ionic measurement devices 4 or laser measurement devices 7 are abnormal. Can be determined.

(Second Embodiment)
(Constitution)
Hereinafter, a sodium detection device according to a second embodiment of the present invention will be described with reference to FIG. The same parts as those of the sodium detector according to the first embodiment are denoted by the same reference numerals, and the description of the same configuration is omitted.

  FIG. 2 is a schematic view of a sodium detection device according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that a plurality of sampling gas stop valves 14 are newly provided. The sampling gas stop valve 14 is provided at each of the branched other ends 3b of the plurality of sampling pipes 3 so that the supply of the sampling gas 21 to the header pipe 5 can be shut off.

(Function)
The operation of the second embodiment of the present invention will be described below. The sampling gas stop valves 14 provided in each of the plurality of sampling pipes 3 are normally all closed, and are sequentially opened one by one at predetermined time intervals. At this time, the sampling gas 21 is introduced into the header pipe 5 from the sampling pipe 3 in which the sampling gas stop valve 14 is opened, and the header pipe from the sampling pipe 3 in which the other sampling gas stop valves 14 are closed. The introduction of the sampling gas 21 to 5 is blocked.

  Therefore, the sampling gas 21 introduced into the header pipe 5 is the sampling gas 21 collected by one sampling pipe 3. The laser detector 7 introduces the sampling gas 21 instead of the mixed gas 22 described above via the junction pipe 6 and measures the light emission amount measurement value 33. The laser type sodium concentration calculation device 11 receives the light emission amount measurement value 33 and calculates the laser type sodium concentration calculation result 34.

  Further, the ion measuring device 4 provided in the sampling pipe 3 that opens the sampling gas stop valve 14 introduces the sampling gas 21 and measures the current value measurement value 31. The ionic sodium concentration calculation device 10 receives the current value measurement value 31 and calculates the ionic sodium concentration calculation result 32. The alarm discrimination device 12 receives the ionic sodium concentration calculation result 32 and the laser sodium concentration calculation result 34, and determines sodium detection by comparing with the sodium detection threshold value.

  Therefore, in the alarm discriminating device 12, the sodium concentration of the sampling gas 21 collected by the sampling pipe 3 that opens the sampling gas stop valve 14 is calculated based on the ionic sodium concentration calculation result 32 and the laser sodium concentration calculation result 34. A detection decision is made.

(effect)
According to the second embodiment of the present invention, the sampling gas stop valve 14 is sequentially opened, and the concentration of the sampling gas 21 of the sampling gas stop valve 14 that is opened is changed to the laser type sodium concentration calculation result 34 and the ionic type. By calculating as the sodium concentration calculation result 32, it is possible to reliably detect sodium in the sampling gas 21 collected at one sodium detection location.

  When the sampling gas stop valve 14 is opened, the sampling gas 21 is introduced into the laser measuring instrument 7 and sodium is measured, and then when the next sampling gas stop valve 14 is opened, the header pipe 5 and A mechanism for once discharging the sampling gas 21 in the junction pipe 6 may be provided. At this time, it is possible to prevent the sampling gas stop valve 14 remaining in the header pipe 5 and the merge pipe 6 from mixing with the sampling gas 21 introduced into the header pipe 5 and the merge pipe 6 from this.

(Third embodiment)
(Constitution)
Hereinafter, a sodium detection device according to a third embodiment of the present invention will be described with reference to FIG. The same parts as those of the sodium detector according to the first embodiment are denoted by the same reference numerals, and the description of the same configuration is omitted.

  FIG. 3 is a schematic view of a sodium detection device according to the third embodiment of the present invention. The third embodiment is different from the first embodiment in that the laser-type sodium concentration calculation device 11 has a new function of transmitting the sodium concentration calculation correction signal 36 to the ionic sodium concentration calculation device 10. .

(Function)
The operation of the third embodiment of the present invention will be described below. In this embodiment, the ionic sodium concentration calculation device 10 is used for calculating the sodium concentration, and the sodium concentration can be quantitatively measured for the reference current _Ib and the concentration conversion count A that are affected by environmental factors such as temperature and pressure. Correction is performed based on the measured value of the laser measuring instrument 7.

First, a method for correcting the reference current I _b. In the correction of the reference current I _b, the sampling gas check valve 14 is opening operation one by one every predetermined time interval, sampling the gas stop valve 14 a sampling pipe 3 of the sampling gas 21 that is opening operation ions formula This is done by introducing the measuring device 4 and the laser measuring device 7.

When laser type sodium concentration calculation result 34 calculated by the laser type sodium concentration calculation unit 11 indicates the background level, I _L is measured as a background level is a current measurement value 31 measured in the ionization-type measuring instrument 4 Current value. At this time, the laser type sodium concentration calculation device 11 transmits a sodium concentration calculation correction signal 36 indicating that the laser type sodium concentration calculation result 34 is a background level to the ionic type sodium concentration calculation device 10.

  The ionic sodium concentration calculation device 10 receives the sodium concentration calculation correction signal 36 and corrects the reference current Ib. When the laser sodium concentration calculation result 34 is at the background level, the left side of the above-described equation (1) can be set to zero.

When the current measurement current IL is a normal value, with _{I L} is the current measurement value _31, a _{I L -I b (N-1} ) are 0. However, indicating if there is a failure of the environmental factors and the ion type measuring device _{3, I b (N-1} ) indicates a value different from the normal _value, the deviation from _{I L -I b (N-1} ) is 0 . Therefore, when I _L −I _{b (N−1)} , which is a deviation amount, is added to the reference current I _{b (N−1)} before correction as a correction factor, it can be corrected as I _bN .

Further, in consideration of the fluctuation of the correction factor due to a sudden change in temperature or pressure, a correction coefficient M1 that reflects the correction factor in the reference current _{Ib (N-1)} by a predetermined ratio is used. The correction coefficient M1 can be determined as 10% to 20%, for example. The corrected reference current _IbN is obtained by adding the correction factor multiplied by the correction coefficient M1 to the uncorrected reference current _{Ib (N-1)} as shown in equation (2).

_{I bN = (I L -I b} (N-1)) × M1 + I b (N-1) ··· (2)
In addition to correcting I _b using the sampling gas 21, correction may be performed using the calibration gas 23. The calibration gas 23 is a gas whose sodium concentration has already been measured. However, since sodium may be mixed into the calibration gas 23 due to sodium remaining in the sampling pipe 3, the calibration is performed by the laser detector 7. By confirming measurement of the working gas 23, it is possible to detect that the calibration gas 23 contains sodium.

  Next, a method for correcting the density conversion count A will be described. In the correction of the concentration conversion count A, the sampling gas stop valve 14 is opened one by one at predetermined time intervals, and the sampling gas 21 in the sampling pipe 3 of the sampling gas stop valve 14 that is opening is ionized. This is done by introducing the measuring device 4 and the laser measuring device 7. At this time, the laser-type sodium concentration calculation device 11 transmits the laser-type sodium concentration calculation result 34 to the ionic-type sodium concentration calculation device 10 as a sodium concentration calculation correction signal 36.

The ionic sodium concentration calculation device 10 receives the sodium concentration calculation correction signal 36 and corrects the concentration conversion count A. When the value L of the laser-type sodium concentration calculation result 34 indicated by the sodium concentration calculation correction signal 36 is assumed to be a true sodium concentration, if it is substituted into the left side of the above-described equation (1), A = L / (I _L −I _b ) It becomes.

However, if there is a failure of the environmental factors and the ion type measuring device 3, A represents a value different from the normal _{value, L / (I L -I b} ) -A N-1 denotes the deviation from the true value. _Therefore, it is possible _{L / (I L -I b)} -A N-1 correction density conversion coefficient _{A N-1} by adding to the current density conversion coefficient _{A N-1} as a correction factor.

Further, in consideration of the variation in the correction factor due to a sudden change in temperature or pressure, a correction factor M2 that reflects the correction factor in the concentration conversion factor A _N-1 by a predetermined ratio is used. The correction coefficient M2 can be determined as 10% to 20%, for example. The corrected density conversion coefficient _AN is obtained by adding the correction factor multiplied by the correction coefficient M2 to the density conversion coefficient _AN-1 before correction as shown in the equation (3).

A _N = [L / (I _L −I _b ) −A _N−1 ] × M2 + A _N−1 (3)
(effect)
According to the third embodiment of the present invention, by using the sodium concentration indicated by the laser sodium concentration calculation result 33, the reference current Ib and the concentration conversion count A, which are parameters used for the calculation of the ionic sodium concentration calculation result 32, are used. Can be corrected without using the calibration gas 23.

  Needless to say, the embodiment of the present invention is not limited to the above-described embodiment. For example, when a plurality of sampling pipes 3 are joined and the sampling gas 21 can be sufficiently mixed in the joining pipe 6, the configuration of the header pipe 5 can be omitted.

  Furthermore, the other end of the sampling pipe 3 is branched, the other end 3a and the ion measuring device 4 are connected, the other end 3b and the header tube 5 are connected, and the entire amount of the sampling gas 21 is introduced into the ion measuring device 4. The sampling pipe 3, the ion measuring instrument 4, and the header pipe 5 may be connected so that the sampling gas 21 measured by the ion measuring instrument 4 and discharged from the ion measuring instrument 4 is introduced into the header pipe 5.

  Further, not only one sampling port 2 is provided at one end of the sampling pipe 3, but also one end of the sampling pipe 3 may be branched and the sampling port 2 may be provided at each of the branched ends. The first to third embodiments can be appropriately combined.

DESCRIPTION OF SYMBOLS 1 ... Sodium detector 2 ... Sampling port 3 ... Sampling piping 4 ... Ion type measuring device 5 ... Header pipe 6 ... Confluence piping 7 ... Laser type measuring device 8 ... Gas piping for calibration 9 ... Gas stop valve for calibration 10 ... Ion type sodium concentration calculation device 11 ... Laser type sodium concentration calculation device 12 ... Alarm discrimination device 13 ... Alarm device 14 ... -Sampling gas stop valve 21 ... Sampling gas 22 ... Confluent gas 23 ... Calibration gas 31 ... Current measurement value 32 ... Ion-type sodium concentration calculation result 33 ... Luminescence measurement value 34 ... Laser-type sodium concentration calculation result 35 ... Alarm determination signal 36 ... Sodium concentration calculation correction signal

Claims (9)

A plurality of sampling pipes for collecting sampling gases at a plurality of sodium detection points from sampling ports, and
A plurality of ion-type measuring devices that are provided in each of the plurality of sampling pipes, supply ions from the ion source to the sampling gas and ionize them, and measure residual ions as current measurement values;
An ionic expression that receives the current measurement values from the plurality of ionic measuring instruments, and further calculates the sodium concentration in the sampling gases as an ionic expression sodium concentration calculation result using a reference current value and a concentration conversion count. A sodium concentration calculator,
A plurality of sampling pipes merged together, and the sampling gas can be mixed to form a mixed gas; and
A laser-type measuring instrument that is provided in this merging pipe and that is excited by irradiating the mixed gas with a laser, and that measures the amount of light emitted when the mixed gas transitions from the excited state to the ground state,
Laser type sodium that receives the measured light emission value from the laser type measuring device and calculates the sodium concentration in the mixed gas as a laser type sodium concentration calculation result using the sodium amount data with respect to the measured light emission value A concentration calculator,
The ionic sodium concentration calculation result is received from the ionic sodium concentration calculation device, and the laser sodium concentration calculation result is further received from the laser type sodium concentration calculation device. The ionic sodium concentration calculation result and the laser type A sodium detection device comprising: an alarm determination device that determines that sodium is contained in the sampling gas when a sodium concentration calculation result exceeds a predetermined sodium detection threshold value. A sampling gas stop valve is further provided in each of the plurality of sampling pipes,
Open the sampling gas stop valve, sequentially introduce the sampling gas collected by one sampling pipe into the merging pipe,
The said laser type measuring device is further equipped with the function to measure the said emitted light amount measurement value of the said sampling gas collected by one said sampling piping instead of the said mixed gas, The said measurement method of Claim 1 characterized by the above-mentioned. Sodium detector. The laser-type measuring instrument measures the luminescence measurement value using the sampling gas collected by one sampling pipe, and the sampling gas uses the luminescence measurement value in a laser-type sodium concentration calculation device. When the sodium concentration indicating the background level is calculated,
The sodium detection device according to claim 2, wherein the reference current is corrected using the measured current value measured by the ionic sodium concentration calculation device. The laser-type measuring device measures the light emission amount measurement value of the sampling gas collected by one sampling pipe, and uses the light emission amount measurement value in the laser-type sodium concentration calculation device to Calculate the sodium concentration as the laser-type sodium concentration calculation result,
The concentration conversion count used for calculation of the ionic sodium concentration calculation result is corrected using the laser sodium concentration calculation result and the current measurement value measured by the ionic sodium concentration calculation device. Item 4. The sodium detector according to Item 2 or Item 3.   In the alarm discriminating device, all of the ionic sodium concentration calculation results calculated from the current measurement values measured by the plurality of ionic measuring instruments are below the sodium detection threshold value and measured by the laser measuring instrument. When the laser-type sodium concentration calculation result calculated from the light emission amount measurement value exceeds the sodium detection threshold value, it is determined that any of the plurality of ion-type measuring devices is abnormal. The sodium detection device according to any one of claims 1 to 4.   The sodium detection device according to claim 5, wherein a plurality of the ion measuring devices that are determined to be abnormal are excluded from the measurement of the current measurement value.   In the alarm discriminating device, all of the ionic sodium concentration calculation results calculated from the current measurement values measured by the plurality of ionic measuring instruments exceed the sodium detection threshold value and are measured by the laser measuring instrument. 2. The laser-type measuring device according to claim 1, wherein when the laser-type sodium concentration calculation result calculated from the light emission amount measurement value is below the sodium detection threshold value, it is determined that the laser-type measuring device is abnormal. Item 7. The sodium detection device according to any one of Items 6 to 6. Further comprising a calibration gas pipe connected in the sampling pipe,
A calibration gas whose sodium concentration has been measured in advance is introduced from the calibration gas pipe into the sampling pipe, and the sodium concentration and the calibration gas indicated by the ion sodium concentration calculator and the laser sodium concentration calculator are shown. The sodium detector according to any one of claims 1 to 7, wherein an abnormality determination of the ion measuring device and the laser measuring device is performed by comparing the sodium concentrations. Collecting sampling gas at a plurality of sodium detection points from the sampling port of each sampling pipe;
A step of supplying ions from the ion source to the sampling gas by an ion measuring device provided in each of the plurality of sampling pipes to ionize and measuring residual ions as current measurement values;
Receiving the current measurement values from a plurality of the ionic measuring instruments, and calculating each of the sodium concentrations in the plurality of sampling gases as an ionic sodium concentration calculation result;
In a merging pipe obtained by merging a plurality of the sampling pipes, a step of mixing the sampling gas into a mixed gas;
A step of irradiating the mixed gas with a laser by a laser-type measuring device provided in the merging pipe, and measuring a light emission amount when the mixed gas transitions from an excited state to a ground state as a light emission amount measurement value;
Receiving the luminescence measurement value from the laser-type measuring device, and calculating a sodium concentration in the mixed gas as a laser-type sodium concentration calculation result;
The ionic sodium concentration calculation result is received from the ionic sodium concentration calculation device, and the laser sodium concentration calculation result is further received from the laser type sodium concentration calculation device. The ionic sodium concentration calculation result and the laser type And a step of determining that sodium is contained in the sampling gas when each of the sodium concentration calculation results exceeds a predetermined threshold for sodium detection.

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