JP5668393B2 - boiler - Google Patents

Description

  The present invention relates to a boiler including a water level sensor for water level control.

  2. Description of the Related Art Conventionally, boilers such as a multi-tube once-through boiler are connected to an annular lower header and an annular upper header at their upper and lower ends, respectively, and a plurality of heat transfer tubes (transmission tubes) are arranged in the vertical direction. It is arranged at the upper part of a combustion chamber formed between a water pipe provided with a heat section, a boiler water supply device for supplying boiler water into each heat transfer pipe (supplying water into the water pipe), and a heat transfer pipe And a burner for heating the boiler water supplied into each heat transfer tube to generate steam.

  In addition, the water pipes of this type of boiler are provided with separators (gas / water separators) with the ends connected to the upper and lower parts of, for example, the upper header and the lower header. The separated can water is separated and returned to the heat transfer tube while the steam is led to the outside, or discharged to the outside (for example, see Patent Document 1 and Patent Document 2).

  Further, this type of boiler is provided with a water level detection device (water level detection means) for detecting the level of the boiler water in each heat transfer tube. In general, the water level detection device is provided in the water level detection cylinder, and a water level detection cylinder that is connected to the upper header and the lower header, and / or the lower header and the separator, respectively, via the communication pipe. A water level sensor (water level sensor for water level control) and a plurality of electrode rods are provided.

  In this water level detection device, since boiler water is introduced into the water level detection cylinder through the connecting pipe, the water level of the boiler water in the water level detection cylinder and the water level of the boiler water in the heat transfer pipe are substantially equal. For this reason, the water level of the boiler water in a heat exchanger tube is detectable by detecting the water level of the water in a water level detection cylinder with a water level sensor. Based on the detection result of the water level sensor, the driving of the boiler water supply device and the like is controlled, and the boiler water (water level, amount) in the heat transfer tube is controlled to supply and discharge the boiler water level in the heat transfer tube. I try to keep it right.

  For multiple electrode rods, when a new boiler is installed or when the water level sensor of an existing boiler is replaced, the water level sensor is properly adjusted by comparing the water level detected by these electrode rods with the water level detected by the water level sensor. It is used to check whether the water level of boiler water in the heat transfer tube is detected. That is, when a new boiler is installed or when a water level sensor of an existing boiler is replaced, the water level sensor is calibrated at a plurality of points (a plurality of water level detection points) using a plurality of electrode rods.

JP 2009-192194 A Japanese Patent Laying-Open No. 2005-321146

  On the other hand, in the above-described conventional boiler, the output characteristics (detection characteristics) of the water level sensor are determined to some extent, but the output may be different even if installed at the same place due to individual differences in the boiler and the water level sensor itself. In addition, when a boiler is used, the detection result (accuracy) of the water level sensor may be shifted due to aging deterioration or adhesion of foreign matters such as sludge and scale (the detection characteristics may change).

  And if there is a gap between the water level detected by the water level sensor and the water level in the heat transfer tube, the heat transfer tube is heated and the water tube is overheated even though the water level in the water tube is significantly below the water supply start water level. Even if it occurs or the water level in the water pipe is higher than the water supply stop water level, the water supply is not stopped, so the steam containing a large amount of can water flows into the separator, and the separator can properly separate the can water and steam. There is a risk of poor dryness.

  In view of the above circumstances, an object of the present invention is to provide a boiler that can reliably detect a deviation in detection accuracy of a water level sensor and can suitably perform water level control (water supply / drainage control).

  In order to achieve the above object, the present invention provides the following means.

In order to solve the above problems, the present invention proposes the following means.
The boiler according to claim 1 is for detecting the water level of water derived through a connecting pipe from a water pipe including a heat transfer section that generates steam by supplying water and heating, and for controlling water supply in the water pipe. The water level detection means includes a water level control water level sensor for detecting the water level of the water steplessly, and a plurality of electrode bars for detecting the water level of the water step by step. In the boiler configured to calibrate the water level control water level sensor at a plurality of points by comparing the water level detection result of the control water level sensor and each water level detection result of the plurality of electrode rods, the plurality of electrode rods are at least The difference between the water level detection result of the water level sensor for water level control and the water level detection result of each electrode rod at a water level detection point of each electrode rod, including a high combustion water level detection rod and an ignition water level detection rod Arise When the, characterized in that it comprises a correcting means for correcting the detection characteristics of the water level control level sensor based on the water level detection result of the electrode rod.

In this invention, when a difference outside the predetermined range occurs between the water level detection result of the water level sensor for water level control and the water level detection result of each electrode rod (when a defective state occurs), by the correction means, Based on the water level detection result of the electrode rod, the detection characteristics of the water level sensor for water level control can be corrected. As a result, even if the output of the water level sensor for water level control is slightly different, or the detection accuracy of the water level sensor for water level control is shifted due to aging, adhesion of foreign matter such as sludge, scale, etc. In addition, it is possible to control the supply of water into the heat transfer tube based on the detection result of the water level sensor for water level control, and to maintain the boiler water level in the heat transfer tube appropriately.

The boiler according to claim 2 is for detecting the water level of the water led out through the connecting pipe from the water pipe including the heat transfer section that generates steam by supplying water and heating it, and for controlling the water supply in the water pipe The water level detection means includes a water level control water level sensor for detecting the water level of the water steplessly, and a plurality of electrode bars for detecting the water level of the water step by step. In the boiler configured to calibrate the water level control water level sensor at a plurality of points by comparing the water level detection result of the control water level sensor and each water level detection result of the plurality of electrode rods, the plurality of electrode rods are at least The difference between the water level detection result of the water level sensor for water level control and the water level detection result of each electrode rod at a water level detection point of each electrode rod, including a high combustion water level detection rod and an ignition water level detection rod Arise When, characterized in that it comprises monitoring means for signal output.

In the present invention, when there is a difference outside the predetermined range between the water level detection result of the water level control water level sensor and the water level detection result of each electrode rod (when a defective state occurs), this is detected by the monitoring means. And can output signals such as alarms. As a result, even if the output of the water level sensor for water level control is slightly different, or the detection accuracy of the water level sensor for water level control is shifted due to aging, adhesion of foreign matter such as sludge, scale, etc. When the alarm level signal is output and the water level control water level sensor is checked, it is possible to control the water supply into the heat transfer tube based on the detection result of the water level control water sensor. It becomes possible to keep the water level at an appropriate level.

The boiler according to claim 3 is the boiler according to claim 1 or 2, wherein the plurality of electrode rods are composed of a low water level detection rod, the high combustion water level detection rod, and the ignition water level detection rod. The high combustion water level detecting rod has the highest water level accuracy .

In the boiler of the present invention, the output of the water level sensor for water level control is different, or the detection accuracy of the water level sensor for water level control is shifted due to aging, adhesion of foreign matters such as sludge and scale. Even in this case, it is possible to control the supply of water into the heat transfer tube based on the detection result of the water level control water level sensor, so that the boiler water level in the heat transfer tube can be maintained appropriately.

  Thereby, the water level control of boiler water can be performed with high accuracy, and it becomes possible to reliably prevent the occurrence of water pipe overheating and poor dryness.

It is a figure showing a boiler concerning a 1st embodiment of the present invention. It is a figure which shows the water level detection apparatus (water level detection means) of the boiler which concerns on 1st Embodiment of this invention. It is a figure which shows the boiler which concerns on the reference example of this invention. It is a figure which shows the water level detection apparatus (water level detection means) of the boiler which concerns on the reference example of this invention.

  Hereinafter, with reference to FIG.1 and FIG.2, the boiler which concerns on 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the boiler A of the present embodiment is a multi-tube once-through boiler, and includes a boiler body 1, a boiler water supply device 2, a separator (gas / water separator) 3, and a water level detection device (water level). Detection means) 4 and a control device 5 are provided.

  The boiler body 1 has a plurality of heat transfer tubes (heat transfer portions) 8 that are respectively connected with an upper and lower ends to an annular lower header 6 and an annular upper header 7 and arranged in the vertical direction in the axial direction. Composed of a combustion chamber 9 formed between the heat transfer tubes 8 and a burner 10 that is disposed above the combustion chambers 9 and generates steam by heating the boiler water W supplied into each heat transfer tube 8. Has been.

  In addition, a blow line 11 having a concentrating blow valve 11a for discharging boiler water W concentrated with the generation of steam to the outside (external) is connected to the lower portion of the boiler body 1. Furthermore, a pressure sensor 12 is provided on the upper portion of the boiler body 1. The burner 10 is connected to a fuel supply line 13 having a fuel supply valve 13a. The fuel supply valve 13a is controlled to be opened and closed so that combustion is controlled to be turned on and off.

  The boiler water supply device 2 includes a feed water line 2a connected to the boiler body 1, a feed water quality measuring unit 2b, a feed water pump 2c, a check valve 2d provided in the feed water line 2a and arranged in order from the upstream side. A water treatment unit (not shown) is provided on the upstream side of the feed water quality measurement unit 2b, and adjusts the quality of the raw water to generate feed water W.

  The separator 3 is a part of the water pipe 15 together with the heat transfer pipe 8 of the boiler body 1, and is connected to the boiler body 1 through a connecting pipe 16 provided with ends connected to the lower header 6 and the upper header 7, respectively. ing. And this separator 3 isolate | separates the vapor | steam S and can water which were produced | generated by the boiler main body 1, and returned the separated can water in the heat exchanger tube 8 again through the lower header 6 while deriving the steam S outside, or It is provided to discharge outside.

  As shown in FIGS. 1 and 2, the water level detection device 4 is a water level detection in which ends are connected to the lower header 6 and the upper header 7, and / or the lower header 6 (connecting tube 16) and the separator 3, respectively. A cylinder 17 is provided. Further, a water level sensor (water level control water level sensor) 20 and a plurality of electrodes provided in the water level detection cylinder 17 for detecting the water level of the water W introduced into the water level detection cylinder 17 through the connecting pipes 16 and 18. A bar (in this embodiment, three electrode bars 21, 22, 23) is provided. The water level sensor 20 detects the water level of the water W in the water level detection cylinder 17 in a stepless manner, and controls the water level of the boiler water W in the heat transfer tube 8. The plurality of electrode bars 21, 22, 23 are provided in the water level detection cylinder 17 such that the respective water level detection points P 1, P 2, P 3 are arranged at predetermined intervals in the vertical direction. The water level of the water W within is detected in stages.

  Here, in the present embodiment, the three electrode rods 21, 22, and 23 are, for example, low in which one electrode rod 23 is disposed with the water level detection point P 1 slightly above the lower limit of the water level sensor 20. Another electrode rod 22 is provided with its water level detection point P2 disposed above the water level detection point P1 of the low water level detection rod 21, and at the time of high combustion where the highest water level accuracy is required. It is a high combustion water level detection rod that detects the water level. Further, the remaining one electrode rod 21 is provided with its water level detection point P3 disposed above the water level detection point P2 of the high combustion water level detection rod 22, and serves as an ignition water level detection rod for detecting the water level at the time of ignition. ing. During normal operation, the ignition water level detection rod 21 always detects the absence of water, and the low water level detection rod 23 always detects the presence of water.

  On the other hand, as shown in FIG. 1, the control device 5 of the present embodiment is provided by connecting signal lines to the feed water quality measuring unit 2b, feed water pump 2c, concentration blow valve 11a, pressure sensor 12, and fuel supply valve 13a. In the boiler A of the present embodiment, the control device 5 performs combustion control of the boiler A, water level control of the boiler water W, and concentration blow control. For example, the control device 5 performs combustion control based on the detection value of the pressure sensor 12, and controls the boiler A so that the steam pressure in the upper header 7 is within a predetermined pressure range. Specifically, when the detected value of the pressure sensor 12 falls to the lower limit pressure, the fuel supply valve 13a is opened to bring the burner 10 into a combustion state, and when the detected value of the pressure sensor 12 rises to the upper limit pressure, the fuel supply valve 13a is closed and the burner 10 is in a combustion stopped state.

  Further, the control device 5 performs on / off control of the water supply pump 2c based on the water level detection result detected by the water level sensor 20 of the water level detection device 4 so that the water level in each heat transfer tube 8 is properly maintained within a predetermined range. To do.

  That is, in the present embodiment, information obtained by detecting the water level of the water W in the water level detection cylinder 17 by the water level sensor 20 is sent to the control device 5, and the control device 5 detects that the water level has become lower than the water supply start water level. Then, an operation command is output to the feed water pump 2c, and water supply to the boiler body 1 is performed. Moreover, when it detects that the water level became higher than the water supply stop water level by water supply, the operation command with respect to the water supply pump 2c will be stopped, and the water supply to the boiler main body 1 will be stopped.

  Furthermore, in the boiler A of this embodiment, the water level detection result of the water level sensor 20 and each electrode rod 21, 22, 23 is sent to the control apparatus 5 at the time of operation of the boiler A, and each electrode rod 21, 22, 23 is detected. The control device 5 compares the water level detection results of the water level sensor 20 at the water level detection points P1, P2, and P3 with the water level detection results of the electrode rods 21, 22, and 23.

  And in the control apparatus 5 of this embodiment, the water level detection result of the water level sensor 20 in the water level detection point P1, P2, P3 of each electrode rod 21,22,23 and the water level detection of each electrode rod 21,22,23. A correction means 25 is provided for correcting the detection characteristics of the water level sensor 20 based on the water level detection results of the electrode rods 21, 22, and 23 when a difference deviating from the predetermined range set in advance occurs. . Further, in the control device 5 of the present embodiment, together with the correction means 25, the water level detection result of the water level sensor 20 at the water level detection points P1, P2, P3 of the electrode rods 21, 22, 23, and the electrode rods 21, 22 , 23 is provided with a monitoring means 26 for outputting a signal when a difference outside the predetermined range occurs between the water level detection results of 23 and 23.

  That is, in the boiler A of the present embodiment, when the plurality of electrode rods 21, 22, 23 are newly installed in the boiler A or when the water level sensor 20 of the existing boiler A is replaced, the plurality of electrode rods 21, 22 are used. 23, the water level sensor 20 is calibrated at a plurality of points (a plurality of water level detection points P1, P2, P3), and the water level is detected step by step together with the water level sensor 20 during operation of the boiler A. The detection result is continuously sent to the control device 5.

  At this time, when the water level drops to the water level detection point P1 of the low water level detection rod (electrode bar) 23, the water level detection result detected by the low water level detection rod 23 and the water level detection result of the water level sensor 20 are the control device 5. In addition, when the water level reaches the water level detection point P2 of the high combustion water level detection rod (electrode rod) 22, the water level detection result detected by the high combustion water level detection rod 22 and the water level detection of the water level sensor 20 are detected. When the result is compared by the control device 5 and further when the water level rises to the water level detection point P3 of the ignition water level detection rod (electrode bar) 21, the water level detection result detected by the ignition water level detection rod 21 and the water level sensor 20 The water level detection results are compared.

  Then, the output of the water level sensor 20 is different, or the detection accuracy of the water level sensor 20 is shifted due to aging, adhesion of foreign matters such as sludge and scale, and the low water level P1, the high combustion water level P2, and the ignition water level P3. If there is a difference outside the predetermined range between the water level detection result of the water level sensor 20 and the water level detection result of each electrode rod 21, 22, 23 at each water level, the monitoring means 26 of the control device 5 outputs a signal such as an alarm. Is output.

  Thereby, the change of the detection characteristic of the water level sensor 20 is confirmed by the operator recognizing the signal output from the monitoring means 26. For this reason, by confirming the signal output from the monitoring means 26 and correcting or calibrating the water level sensor 20, the boiler water W (water level, amount in the heat transfer tube 8 is preferably based on the detection result of the water level sensor 20. ) Is returned so that the supply / discharge control can be performed, and the water level of the boiler water W in the heat transfer tube 8 is appropriately maintained.

  Further, in the present embodiment, correction means 25 is provided. For this reason, a difference outside the predetermined range occurs between the water level detection result of the water level sensor 20 and the water level detection result of each electrode rod 21, 22, 23, and when a signal such as an alarm is output from the monitoring means 26, For example, when the operator performs a button operation or the like, the correction unit 25 corrects the detection characteristics of the water level sensor 20 based on the water level detection results of the electrode bars 21, 22, and 23.

  As a result, even if the output of the water level sensor 20 is different or the detection accuracy of the water level sensor 20 is shifted due to aging, adhesion of foreign matters such as sludge, scale, etc., the detection of the water level sensor 20 is detected. Based on the result, the boiler water W in the heat transfer tube 8 is controlled to be supplied and discharged, and the water level of the boiler water W in the heat transfer tube 8 can be easily maintained appropriately.

  Therefore, in the boiler A of this embodiment, when the difference which remove | deviates from a predetermined range arises between the water level detection result of the water level sensor 20, and the water level detection result of each electrode rod 21,22,23, the correction | amendment means 25 performs. The detection characteristics of the water level sensor 20 can be corrected based on the water level detection results of the electrode rods 21, 22, and 23. As a result, even if the output of the water level sensor 20 is different or the detection accuracy of the water level sensor 20 is shifted due to aging, adhesion of foreign matters such as sludge, scale, etc., the detection of the water level sensor 20 is detected. Based on the result, the boiler water W in the heat transfer tube 8 is controlled to be supplied and discharged, so that the water level of the boiler water W in the heat transfer tube 8 can be maintained appropriately.

  Further, when a difference outside the predetermined range occurs between the water level detection result of the water level sensor 20 and the water level detection result of each electrode rod 21, 22, 23, this is detected by the monitoring means 26 and a signal such as an alarm is output. Can be output. As a result, even if the output of the water level sensor 20 is different or the detection accuracy of the water level sensor 20 is shifted due to aging, adhesion of foreign matter such as sludge, scale, etc., a signal such as an alarm is output. By checking the water level sensor 20 while being output, the boiler water W in the heat transfer tube 8 can be suitably controlled based on the detection result of the water level sensor 20, and the boiler water W in the heat transfer tube 8 can be controlled. It becomes possible to keep the water level appropriate.

  Therefore, according to the boiler A of this embodiment, the water level control of the boiler water W can be performed with high accuracy, and it becomes possible to reliably prevent the occurrence of water pipe overheating and poor dryness.

  As mentioned above, although 1st Embodiment of the boiler which concerns on this invention was described, this invention is not limited to said 1st Embodiment, It can change suitably in the range which does not deviate from the meaning. For example, in the present embodiment, the control device 5 has been described as including the correction unit 25 and the monitoring unit 26. However, the control unit 5 may include at least one of the correction unit 25 and the monitoring unit 26. About 26, you may make it use for control, such as giving an alarm by a signal, or using it for water supply correction | amendment, or stopping the boiler A according to the magnitude | size of an error. As a result, even if the output of the water level sensor 20 is different or the detection accuracy of the water level sensor 20 is deviated due to aging, adhesion of foreign matters such as sludge, scale, etc., It becomes possible to maintain the water level of the boiler water W appropriately.

Next, with reference to FIG.3 and FIG.4, the boiler B which concerns on the reference example of this invention is demonstrated. This reference example relates to a multi-pipe once-through boiler similar to that of the first embodiment, and only the configuration of the water level detection device (and control device) is different. For this reason, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The water level detection device (water level detection means) 30 of the reference example is respectively connected to the lower header 6 and the upper header 7 and / or the lower header 6 (communication tube 16) and the separator 3 as in the first embodiment. The water level detection cylinder 17 is connected to each other. On the other hand, a water level control water level sensor 31 and a comparative water level sensor 32 for detecting the water level of the water W introduced into the water level detection cylinder 17 through the connecting pipes 16 and 18 are provided in the water level detection cylinder 17. ing.

In the boiler B of the reference example , the water level detection results of the water level control water level sensor 31 and the comparative water level sensor 32 are always sent to the control device 5 during operation of the boiler B, and the water level detection of the water level control water level sensor 31 is performed. The result and the water level detection result of the comparative water level sensor 32 are constantly compared by the control device 5.

Further, in the control device 5 of the reference example , when there is a difference outside the predetermined range set in advance between the water level detection result of the water level control water level sensor 31 and the water level detection result of the comparative water level sensor 32, Correcting means 25 for correcting the detection characteristics of the water level control water level sensor 31 based on the water level detection results of both the water level sensors 31 and 32 is provided. Furthermore, the control device 5 of the present embodiment is provided with a monitoring unit 26 that outputs a signal when there is a difference outside the predetermined range between the water level detection results of the water level sensors 31 and 32 together with the correction unit 25. ing.

  For this reason, if the output of the water level control water level sensor 31 is different or the detection accuracy of the water level control water level sensor 31 is shifted due to aging deterioration, adhesion of foreign matters such as sludge and scale, etc., the control device 5 The monitoring means 26 outputs a signal such as an alarm.

Thereby, the change in the detection characteristic of the water level control water level sensor 31 is confirmed by the operator recognizing the signal output from the monitoring means 26. For this reason, also in the boiler B of the reference example , by confirming the signal output from the monitoring means 26 and correcting or calibrating the water level control water level sensor 31, the detection result of the water level control water level sensor 31 is preferably obtained. Based on this, the boiler water W (water level, amount) in the heat transfer tube 8 is returned so as to be able to supply / discharge control, and the water level of the boiler water W in the heat transfer tube 8 is maintained appropriately.

Further, in the reference example , since the correction means 25 is provided, a difference that deviates from a predetermined range occurs between the water level detection result of the water level control water level sensor 31 and the water level detection result of the comparative water level sensor 32. When a signal such as an alarm is output from 26, for example, when an operator performs a button operation or the like, the correction means 25 detects the detection characteristics of the water level sensor 31 for water level control based on the water level detection results of both the water level sensors 31 and 32. Correct.

  As a result, even if the output of the water level control water level sensor 31 is different or the detection accuracy of the water level control water level sensor 31 is shifted due to aging deterioration, adhesion of foreign matters such as sludge and scale, etc. The boiler water W in the heat transfer tube 8 is controlled based on the detection results of both the water level sensors 31 and 32, and the water level of the boiler water W in the heat transfer tube 8 can be easily maintained appropriately.

Therefore, in the boiler B of the reference example , when a difference out of the predetermined range occurs between the water level detection result of the water level control water level sensor 31 and the water level detection result of the comparative water level sensor 32, the correction means 25 Based on the water level detection results of the water level control water level sensor 31 and the comparative water level sensor 32, the detection characteristics of the water level control water level sensor 31 can be corrected.

  As a result, even if the detection accuracy of the water level control water level sensor 31 is shifted, the boiler water W in the heat transfer tube 8 is controlled to be supplied and discharged based on the detection results of both the water level sensors 31 and 32. It becomes possible to maintain the water level of the boiler water W in the heat exchanger tube 8 appropriately.

  In addition, when a difference outside the predetermined range occurs between the water level detection result of the water level control water level sensor 31 and the water level detection result of the comparative water level sensor 32, the monitoring means 26 captures this and outputs a signal such as an alarm. Can be output.

  As a result, even when a deviation occurs in the detection accuracy of the water level control water level sensor 31, a signal such as an alarm is output and the water level control water level sensor 31 is checked, so that the water level control water level is suitably The boiler water W in the heat transfer tube 8 can be supplied and discharged based on the detection result of the sensor 31, and the water level of the boiler water W in the heat transfer tube 8 can be kept appropriate.

Therefore, also in the boiler B of the present reference example , the water level control of the boiler water W can be performed with high accuracy as in the first embodiment, and it is possible to reliably prevent the occurrence of water pipe overheating and poor dryness. become.

As mentioned above, although the reference example of the boiler which concerns on this invention was demonstrated, this invention is not limited to said reference example , In the range which does not deviate from the meaning, it can change suitably. For example, as in the first embodiment, the control device 5 includes the correction unit 25 and the monitoring unit 26. However, the control device 5 may include at least one of the correction unit 25 and the monitoring unit 26.

DESCRIPTION OF SYMBOLS 1 Boiler main body 2 Boiler water supply apparatus 2a Feed water line 2b Feed water quality measuring part 2c Feed water pump 2d Check valve 3 Separator 4 Water level detection device (water level detection means)
5 Control device 6 Lower header 7 Upper header 8 Heat transfer tube (heat transfer section)
9 Combustion chamber 10 Burner 11 Blow line 11a Concentration blow valve 12 Pressure sensor 13 Fuel supply line 13a Fuel supply valve 15 Water pipe 16 Communication pipe 17 Water level detection cylinder 18 Communication pipe 20 Water level sensor (water level sensor for water level control)
21 Electrode bar 22 Electrode bar 23 Electrode bar 25 Correction means 26 Monitoring means 30 Water detection device (water level detection means)
31 Water level sensor for water level control 32 Water level sensor for comparison A Boiler B Boiler P1 Water level detection point P2 Water level detection point P3 Water level detection point S Steam W Boiler water, water, water supply

Claims (3)

A water level detecting means for detecting the water level of the water derived from the water pipe including the heat transfer section that generates steam by supplying water and heating it through the connecting pipe, and for controlling water supply in the water pipe;
The water level detection means comprises a water level control water level sensor for detecting the water level in a stepless manner, and a plurality of electrode bars for detecting the water level in stages.
In the boiler configured to calibrate the water level control water level sensor at a plurality of points by comparing the water level detection result of the water level control water level sensor and each water level detection result of the plurality of electrode rods,
The plurality of electrode rods include at least a high combustion water level detection rod and an ignition water level detection rod,
When there is a difference outside the predetermined range between the water level detection result of the water level control water level sensor and the water level detection result of each electrode rod at the water level detection point of each electrode rod, the water level detection result of the electrode rod is A boiler comprising correction means for correcting the detection characteristics of the water level sensor for water level control based on the above. A water level detecting means for detecting the water level of the water derived from the water pipe including the heat transfer section that generates steam by supplying water and heating it through the connecting pipe, and for controlling water supply in the water pipe;
The water level detection means comprises a water level control water level sensor for detecting the water level in a stepless manner, and a plurality of electrode bars for detecting the water level in stages.
In the boiler configured to calibrate the water level control water level sensor at a plurality of points by comparing the water level detection result of the water level control water level sensor and each water level detection result of the plurality of electrode rods,
The plurality of electrode rods include at least a high combustion water level detection rod and an ignition water level detection rod,
Monitoring means for outputting a signal when a difference outside a predetermined range occurs between the water level detection result of the water level control water level sensor at the water level detection point of each electrode bar and the water level detection result of each electrode bar; Boiler characterized by being. The boiler according to claim 1 or 2,
When the plurality of electrode rods are composed of a low water level detection rod, the high combustion water level detection rod, and the ignition water level detection rod, the high combustion water level detection rod has the highest water level accuracy. boiler, characterized in that there.

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