JP6146198B2 - Boiler system - Google Patents

Description

  The present invention relates to a boiler system including a boiler group having a plurality of boilers capable of burning by changing a combustion rate.

  In a boiler that generates steam by evaporating water, it is required to appropriately control the concentration of feed water (canned water) in the boiler from the viewpoint of stable operation. That is, when the concentration of can water increases, carryover occurs, resulting in a decrease in the dryness of steam and damage to related equipment such as valves. Therefore, a concentration blow operation for periodically discharging the can water in the boiler is performed so that the degree of concentration does not become too high. Moreover, since the boiler (can body) will corrode if the concentration of can water falls, it is supposed that a boiler will be burned regularly and the concentration of can water will be raised.

  By the way, in a boiler system in which a plurality of boilers are installed, a unit control method for controlling the number of operating units according to the load condition is adopted. In this number control method, priority is set for each boiler, and operation (combustion) is performed from the boiler with higher priority.

  The priority order is usually changed at a predetermined cycle (for example, every 24 hours), but depending on the load situation, a boiler with a low priority order may stop burning for a long time. At this time, in the case where the concentration blow has been performed on the low priority boiler, there is a possibility that the boiler may be corroded because it may not burn for a long time while the concentration of the can water is lowered. is there. Therefore, Patent Literature 1 describes a method for controlling the number of boilers in which the concentration of can water is monitored and the priority of boilers with reduced concentrations is adjusted higher.

JP 2003-130304 A

  According to the boiler number control method of Patent Document 1, since the priority order of boilers in which the concentration of can water is reduced due to the concentration blow is adjusted to the higher order, the concentration of can water can be appropriately controlled. .

  By the way, in a boiler system provided with a plurality of boilers, a steam header for storing steam generated from the boiler is provided, and steam is supplied from the steam header to load equipment. Although a check valve is provided between each boiler and the steam header to prevent the backflow of steam to the boiler, steam flows back from the steam header or other boilers to the boilers that have stopped combustion due to deterioration over time. This phenomenon has been confirmed. If the steam flows back to the boiler that has stopped burning, the concentration of the can water will decrease, so a new device for appropriately controlling the concentration of the can water is required.

  This invention is made | formed in view of such a request, and it aims at providing the boiler system which prevents the fall of the enrichment accompanying the vapor | steam which flowed back from the steam header or the other boiler.

  The present invention relates to a boiler group having a plurality of boilers capable of burning at different combustion rates, a steam pipe and a steam header for collecting steam output from the boiler group, and a priority set for each of the boilers. A control unit that controls the combustion state of the boiler group based on the boiler system, wherein the plurality of boilers include a backflow detection unit that detects a backflow of steam from the steam header or steam pipe, and a can A conductivity measuring unit that measures the electrical conductivity of water, and the control unit changes the priority of a boiler having a lower electrical conductivity than a predetermined value among the boilers in which steam is flowing backward to a higher priority. The present invention relates to a boiler system including a setting unit.

  Further, the present invention is set to each of the boiler group having a plurality of boilers capable of burning at different combustion rates, a steam pipe or a steam header for collecting steam output from the boiler group, and the boiler. A control unit that controls a combustion state of the boiler group based on a priority order, and a plurality of the boilers detect a reverse flow of the steam from the steam header or the steam pipe; and A conductivity measuring unit that measures a change in electrical conductivity of the can water after the combustion is stopped, and the control unit is configured to operate the electric power after stopping the combustion in the boiler in which the steam is flowing backward. The present invention relates to a boiler system including a priority setting unit that changes the priority of a boiler whose conductivity has decreased by a predetermined value or higher.

  Moreover, it is preferable that the said backflow detection part detects whether the steam is backflowing from the said steam header or a steam pipe | tube based on the pressure in a can after 1st time progress after stopping combustion.

  Moreover, it is preferable that the said backflow detection part detects whether the steam is backflowing from the said steam header or a steam pipe | tube based on the water level in a can after 2nd time progress after stopping combustion.

  In addition, it is preferable that the information processing apparatus further includes a notifying unit for notifying a boiler whose priority is changed a predetermined number of times by the priority setting unit.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the enrichment accompanying the vapor | steam which flowed back from the steam header or the other boiler can be prevented.

It is a figure showing the outline of the boiler system concerning one embodiment of the present invention. It is a figure which shows the outline of the boiler which comprises a boiler group. It is a block diagram which shows the function structure of the control part of a local control part and a number control apparatus. It is a figure which shows the change of the combustion state of the boiler which comprises a boiler group. It is a flowchart which shows the flow of a process of a boiler system.

Hereinafter, a preferred embodiment of a boiler system of the present invention will be described with reference to the drawings.
First, the overall configuration of the boiler system 1 of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an outline of a boiler system according to an embodiment of the present invention.
As shown in FIG. 1, the boiler system 1 includes a boiler group 2 including a plurality (three) of boilers 20, a steam header 6 that collects steam generated in the plurality of boilers 20, and the steam header 6. A vapor pressure sensor 7 for measuring the internal pressure and a number control device 3 having a control unit 4 for controlling the combustion state of the boiler group 2 are provided.

The boiler group 2 generates steam to be supplied to the steam use facility 18.
The steam header 6 collects and stores the steam generated in the boiler group 2, thereby adjusting the pressure difference and pressure fluctuation of the plurality of boilers 20, and supplying the steam whose pressure is adjusted to the steam using facility 18. Supply. The steam header 6 is connected to a plurality of boilers 20 constituting the boiler group 2 via a steam pipe 11, and is connected to a steam using facility 18 via a steam supply pipe 12.

The steam pipe is connected to the vertical steam pipe 11 extending so as to rise upward in the vertical direction from each of the plurality of boilers 20, and the tip ends of the vertical steam pipes 11 are connected, and the tip side is pulled down in the vertical direction. And a collective steam pipe 14 connected to the steam header 6.
A check valve 111 is provided at a connection portion between the vertical steam pipe 11 and the plurality of boilers 20 to prevent the steam from flowing back to the boiler 20 from the steam header 6 or the steam pipe (collecting steam pipe 14).

  The vapor pressure sensor 7 is electrically connected to the number control device 3 via the signal line 13. The steam pressure sensor 7 measures the steam pressure inside the steam header 6 (steam pressure generated in the boiler group 2), and sends a signal (steam pressure signal) related to the measured steam pressure via the signal line 13. It transmits to the control apparatus 3.

  The number control device 3 is electrically connected to the plurality of boilers 20 through the signal line 16. The number control device 3 controls the combustion state of the boiler group 2 by controlling the combustion position of each boiler 20 based on the steam pressure inside the steam header 6 measured by the steam pressure sensor 7. The number control device 3 includes a storage unit 5 and a control unit 4.

The storage unit 5 stores the contents of instructions given to each boiler 20 under the control of the number control device 3 (control unit 4), information such as the combustion position received from each boiler 20, combustion patterns and priorities described later. Setting information, setting information related to priority order change (rotation), and the like are stored.
The control unit 4 gives various instructions (number control signal) to each boiler 20 via the signal line 16 and receives various data from each boiler 20 to determine the combustion state of the three boilers 20. Control priority. When each boiler 20 receives a signal for changing the combustion state from the number control device 3, it controls the boiler 20 according to the instruction.

The above boiler system 1 can supply the steam generated in the boiler group 2 to the steam using equipment 18 via the steam header 6.
The load required in the boiler system 1 (required load) is the amount of steam consumed in the steam using facility 18. The number control device 3 determines the fluctuation of the steam pressure inside the steam header 6 corresponding to the fluctuation of the steam consumption based on the steam pressure (physical quantity) inside the steam header 6 measured by the steam pressure sensor 7. It calculates and controls the combustion state of each boiler 20 which comprises the boiler group 2. FIG.

  Specifically, the demand load (steam consumption) increases due to an increase in demand for the steam use facility 18, and if the supply steam quantity is insufficient, the steam pressure inside the steam header 6 decreases. On the other hand, if the demand load (steam consumption) decreases due to a decrease in the demand of the steam use facility 18, and the supply steam amount becomes excessive, the steam pressure inside the steam header 6 increases. Therefore, the boiler system 1 can monitor the fluctuation of the required load based on the fluctuation of the vapor pressure measured by the vapor pressure sensor 7. Then, the boiler system 1 calculates the required steam amount (required steam amount) according to the consumed steam amount (required load) of the steam using equipment 18 based on the steam pressure of the steam header 6, and The boiler group 2 is burned so that the steam is supplied to the steam header 6.

  Each of the plurality of boilers 20 is a steam boiler that generates steam by changing the combustion rate according to the control of the number control device 3 and burning it. A priority order is set for each of the boilers 20. The priority order is used to select the boiler 20 that performs a combustion instruction or a combustion stop instruction. The priority order can be set, for example, using an integer value so that the lower the numerical value, the higher the priority order. When the priorities of “1” to “3” are assigned to the first to third units of the boiler 20, the first unit has the highest priority and the third unit has the lowest priority. This priority order is changed at predetermined time intervals (for example, 24 hour intervals) under the control of the number control device 3.

Each of the plurality of boilers 20 includes a boiler body 21 in which combustion is performed, and a local control unit 22 that controls the combustion state of the boiler 20.
FIG. 2 is a diagram showing an outline of the boiler 20 constituting the boiler group 2. In FIG. 2, only one boiler 20 in the boiler group 2 is illustrated, but the other boilers 20 basically have the same configuration.

  As shown in FIG. 2, the boiler body 21 of the boiler 20 includes a plurality of water pipes 211, a lower header 212, an upper header 213, a combustion chamber 214, a burner 215, a local vapor pressure sensor 216, and a water level sensor 217. And a conductivity sensor 218.

The plurality of water pipes 211 extend in the vertical direction inside the boiler body 21 and are arranged at predetermined intervals in the longitudinal direction and the width direction of the boiler body 21.
The lower header 212 is disposed at the lower part of the boiler body 21. The lower header 212 is connected to the lower ends of the plurality of water pipes 211.
The upper header 213 is disposed on the upper portion of the boiler body 21. The upper header 213 is connected to the upper ends of a plurality of water pipes 211. A steam pipe (vertical steam pipe 11) is connected to the upper header 213 so that steam stored in the upper header 213 can be taken out. The vertical steam pipe 11 is provided with a check valve 111 for preventing the backflow of steam.

The combustion chamber 214 is configured by a space surrounded by a plurality of water pipes 211.
The burner 215 heats the inside of the boiler body 21 by burning. The burner 215 includes a fuel injection nozzle and an air supply nozzle (both not shown). The burner 215 injects fuel from the fuel injection nozzle toward the combustion chamber 214 of the boiler body 21 and supplies air from the air supply nozzle to the combustion chamber 214 of the boiler body 21 to burn the fuel.

  The local vapor pressure sensor 216 is electrically connected to the local control unit 22 via a signal line. The local vapor pressure sensor 216 measures the pressure inside the boiler of the boiler 20 (that is, the vapor pressure inside the upper header 213), and locally controls a signal (vapor pressure signal) related to the measured vapor pressure via a signal line. To the unit 22.

  The water level sensor 217 is electrically connected to the local control unit 22 via a signal line. The water level sensor 217 measures the water level of the can water stored in the water pipe 211 and transmits a signal (water level signal) relating to the measured water level to the local control unit 22 via the signal line.

  The conductivity sensor 218 is electrically connected to the local control unit 22 via a signal line. The conductivity sensor 218 measures the electrical conductivity of the canned water stored in the water pipe 211 and transmits a signal (conductivity signal) related to the measured electrical conductivity to the local control unit 22 via the signal line. .

The local control unit 22 controls the combustion state of the boiler 20 based on the number control signal transmitted from the number control device 3, and the combustion of the boiler 20 so as to prevent a decrease in the concentration of the can water in the water pipe 211. Control the state. Specifically, the local control unit 22 of the present embodiment reduces the concentration of canned water due to steam flowing back from the steam header 6 or the steam pipe 14 to the boiler 20 due to aging deterioration of the check valve 111 or the like. To prevent.
Hereinafter, a specific description will be given with reference to FIG. FIG. 3 is a block diagram illustrating functional configurations of the local control unit 22 and the control unit 4 of the number control device 3.

  As shown in FIG. 3, the local control unit 22 includes a backflow detection unit 23 and a conductivity measurement unit 24, and the control unit 4 of the number control device 3 includes a priority setting unit 41, a notification Part 42.

  The backflow detector 23 detects the backflow of steam from the steam header 6 or the steam pipe 14 to the boiler 20. Although the check valve 111 is provided in the steam pipe 11 connecting the boiler 20 and the steam header 6 as described above, when steam flows backward from the steam header 6 or the steam pipe 14 to the boiler 20 due to aging deterioration or the like. There is. The backflow detector 23 detects such a backflow of steam. In addition, when the boiler 20 is burning, since the steam pressure of the boiler 20 (upper header 213) is usually higher than the steam pressure of the steam header 6, the backflow of steam from the steam header 6 and the steam pipe 14 is This is performed for the boiler 20 that is stopped in combustion.

Here, the detection of the backflow by the backflow detection unit 23 can be performed by an arbitrary method.
As an example, the boiler 20 whose combustion is stopped decreases in pressure in the can with time, but when the steam flows backward from the steam header 6 or the steam pipe 14, the pressure in the can of the boiler 20 increases. Therefore, the steam pressure of the upper header 213 after the first time has elapsed after the boiler 20 stops combustion is acquired from the local steam pressure sensor 216, and it is detected whether the steam is flowing backward from the steam header 6 or the steam pipe 14. It is good. In this case, for example, when the vapor pressure of the upper header 213 after the elapse of the first time is 0.01 Mpa or more, the reverse flow detector 23 determines that the vapor is flowing backward.
Moreover, when the boiler 20 has stopped combustion, the steam that has flowed back from the steam header 6 or the steam pipe 14 is cooled and stored as can water in the water pipe 211 of the boiler 20. The water level in the can rises. Therefore, the water level in the can after the second time has elapsed after the boiler 20 stops combustion may be acquired from the water level sensor 217 to detect whether steam is flowing backward from the steam header 6 or the steam pipe 14. In this case, for example, when the water level of the water pipe 211 after the elapse of the second time is 200 mm or more higher than the water level of the water pipe 211 after the combustion is stopped and a predetermined time elapses, the backflow detection unit 23 causes the steam to flow back. It is determined that

Since the concentration of steam is lower than that of canned water in the water pipe 211, if the steam flows backward from the steam header 6 or the steam pipe 14, the concentration of canned water in the water pipe 211 is lowered.
Therefore, the conductivity measuring unit 24 determines the electrical conductivity of the can water in the water pipe 211 based on the conductivity signal from the conductivity sensor 218 or the electricity of the can water in the water pipe 211 after the boiler 20 stops burning. Measure the change in conductivity.

  When the backflow detection unit 23 detects backflow and the electrical conductivity measured by the conductivity measurement unit 24 is a predetermined value (for example, 30 mS / m) or less, or the backflow detection unit 23 detects backflow, When the change in electrical conductivity measured by the conductivity measuring unit 24 is equal to or greater than a predetermined (−10 mS / m), a priority change signal is transmitted from the local control unit 22 to the control unit 4 of the number control device 3. .

  The priority setting unit 41 included in the control unit 4 of the number control device 3 changes the priority of the boiler 20 to higher (for example, first) when a priority change signal is transmitted from the local control unit 22. The boiler 20 in which the steam flows backward from the steam header 6 or the steam pipe 14 is the boiler 20 that stops combustion, and has a low priority. Therefore, by changing the priority order of the boiler 20 to the higher order, it is possible to preferentially burn the boiler 20 in which the steam flows backward and the electrical conductivity is lowered.

This will be specifically described with reference to FIG. FIG. 4 is a diagram illustrating changes in the combustion state of the plurality of boilers 20.
In the boiler system 1, the combustion states of the plurality of boilers 20 are controlled according to the required load. Specifically, combustion is performed in order from the boiler 20 with the highest priority, and the generation of steam follows the required load. Referring to FIG. 4 (1), the first priority is set for the No. 1 boiler, the second priority is set for the No. 2 boiler, and the third priority is set for the No. 3 boiler. At this time, only the No. 1 boiler of the first priority is burned according to the required load, and the No. 2 and No. 3 boilers of the second and third priority are stopped.

  The local control unit 22 of each boiler 20 determines whether or not there is a backflow of steam from the steam header 6 or the steam pipe 14, and whether or not the electrical conductivity of the can water is reduced (or changed more than a predetermined value) due to the backflow of steam. Determine. At this time, when there is a backflow of steam and the electrical conductivity of the can water is reduced (or changed by a predetermined value or more), it can be determined that the low concentration of the can water is progressing. In FIG. 4 (1), it is assumed that low enrichment is not progressing in the No. 2 boiler that has stopped combustion, and low enrichment is progressing in the No. 3 boiler.

  In such a case, a priority change signal is transmitted from the local control unit 22 of the No. 3 boiler to the number control device 3. And when this priority change signal is received, the unit control device 3 changes the priority of the No. 3 boiler to the higher rank, and lowers the priority of the other boilers 20 in accordance with this change. As a result, as shown in FIG. 4 (2), the No. 3 boiler is set to the first priority, and the No. 3 boiler that has progressed in low concentration is preferentially burned. Concentration increases. In this way, only when the concentration of the No. 3 boiler is reduced due to the backflow of steam, the priority of the No. 3 boiler is advanced, so that the priority rotation interval (for example, the 24-hour interval) is maintained, Low concentration of canned water can be suppressed.

  That is, if the rotation interval of the priority order is shortened, the priority order of the boiler 20 is frequently changed, so that the boiler 20 in which the steam is flowing back immediately starts combustion. However, if the rotation interval is shortened, the burning boiler 20 is frequently switched, and the efficiency of the boiler system is reduced. In this respect, in the boiler system 1 of the present embodiment, the priority order is changed only when the steam is flowing backward, so that the priority order is not inadvertently changed and the efficiency of the boiler system 1 is maintained. Can do.

  Note that the priority order changed by the priority order setting unit 41 may be returned at a predetermined timing. That is, it is good also as returning to the original priority at the timing when combustion of the No. 3 boiler was performed for a predetermined time.

  Returning to FIG. 3, the notification unit 42 counts the number of times the priority order has been changed by the priority order setting unit 41 for each boiler 20, and notifies the administrator of the boiler system 1 when it reaches the predetermined number or more. To do. That is, the priority order setting unit 41 changes the priority order when steam flows backward from the steam header 6 or the steam pipe 14, and a check valve 111 is provided between the steam header 6 and the boiler 20. Steam backflow is prevented. Therefore, it is considered that the check valve 111 is abnormal when the steam flows backward from the steam header 6 or the steam pipe 14. Therefore, the notification unit 42 notifies the administrator of the boiler system 1 that the check valve 111 of the boiler 20 is damaged, and prompts maintenance and inspection of the check valve 111.

  The operation of the boiler system 1 described above will be described with reference to FIG. FIG. 5 is a flowchart showing a process flow of the boiler system 1.

  First, in step ST <b> 1, each of the local control units 22 (backflow detection units 23) of the plurality of boilers 20 determines whether there is a backflow of steam from the steam header 6 or the steam pipe 14. If there is a backflow of steam, the process proceeds to step ST2, and if there is no backflow of steam, the process proceeds to step ST7. In step ST7, the control unit 4 of the number control device 3 controls the combustion of each boiler 20 according to the required load based on the currently set priority, and ends the process. That is, when there is no backflow of steam, the combustion of each boiler 20 is controlled with the set priority order.

  In step ST2, the local control unit 22 (conductivity measurement unit 24) of the plurality of boilers 20 determines whether or not the electrical conductivity of the can water in the water pipe 211 is reduced, that is, the electrical conductivity is equal to or lower than a predetermined value, or It is determined whether or not the change (decrease degree) in electrical conductivity is greater than or equal to a predetermined value. If the electrical conductivity has decreased, the process proceeds to step ST3. If the electrical conductivity has not decreased, the process proceeds to step ST7. In step ST7, the control unit 4 of the number control device 3 controls the combustion of each boiler 20 according to the required load based on the currently set priority, and ends the process. That is, even if there is a backflow of steam, if the electrical conductivity does not decrease, the combustion of each boiler 20 is controlled in the set priority order.

  In step ST3, the local control unit 22 that has determined YES in step ST1 and step ST2 transmits a priority change signal that requests the control unit 4 of the number control device 3 to raise the priority. When this priority change signal is received, in step ST4, the control unit 4 (priority setting unit 41) of the number control device 3 raises the priority of the boiler 20 including the local control unit 22 that has transmitted the priority change signal. , Change to higher. In step ST4, the control unit 4 (priority setting unit 41) of the number control device 3 counts the number of times the priority is raised.

  In subsequent step ST5, the control unit 4 (notification unit 42) of the number control device 3 determines whether or not the number of times counted in step ST4 is a predetermined number or more. If it is greater than or equal to the predetermined number, the process proceeds to step ST6, and if it is less than the predetermined number, the process proceeds to step ST7. In step ST6, the control unit 4 (notification unit 42) of the number control device 3 notifies the administrator of the boiler system 1 that the check valve 111 needs to be confirmed. Moreover, in step ST7, the control part 4 of the number control apparatus 3 controls combustion of each boiler 20 according to request | requirement load based on the priority changed by step ST4, and complete | finishes a process.

  According to the boiler system 1 of this embodiment demonstrated above, there exist the following effects.

(1) In the boiler system 1 of the present embodiment, each of the plurality of boilers 20 is provided with a backflow detection unit 23 that detects a backflow of steam from the steam header 6 and the other boilers 20 (steam pipes 14). The backflow of steam from the header 6 and the steam pipe 14 to the boiler 20 can be detected. And when the electrical conductivity of the can water of the boiler 20 falls in the state where there is a backflow of steam from the steam header 6 or the steam pipe 14, a priority change signal is transmitted from the boiler 20 to the unit control device 3, and this signal is The number control device 3 is configured to change the priority order of the boiler 20 to the higher order.
Thereby, it is possible to preferentially burn the boiler 20 in which the concentration of the can water is reduced due to the reverse flow of the steam, and it is possible to increase the concentration of the can water in the boiler 20. As a result, it is possible to prevent the concentration from decreasing due to the backflow of steam, and to ensure the safety of the equipment.

(2) Note that a priority change signal is sent from the boiler 20 to the unit control device 3 based on the change in the electrical conductivity after the combustion is stopped, not the value of the electrical conductivity when the steam is flowing backward. It is good also as transmitting.
Thereby, it is possible to preferentially burn the boiler 20 in which the decrease in the concentration of can water proceeds rapidly, and the concentration of the can water in the boiler 20 can be increased.

(3) When the steam flows backward from the steam header 6 or the steam pipe 14 to the boiler 20, the internal pressure of the can rises. Therefore, the reverse flow detector 23 may detect the reverse flow based on the change in the internal pressure of the can. .
(4) Further, when the steam flows backward from the steam header 6 or the steam pipe 14 to the boiler 20, the water level in the can rises, so the backflow detection unit 23 detects the backflow based on the change in the water level in the can. Also good.
Thereby, the reverse flow of the steam from the steam header 6 or the steam pipe 14 to the boiler 20 can be reliably detected.

(5) Further, when the boiler 20 transmits the priority change signal at least a predetermined number of times, the unit control device 3 notifies the administrator of the boiler system 1 of the boiler 20.
Normally, the backflow of steam from the steam header 6 and the steam pipe 14 is prevented by the check valve 111, and therefore it is considered that the check valve 111 has some abnormality in the boiler 20 having the backflow of steam. In this respect, the boiler system 1 notifies the boiler 20 that has been given a higher priority due to the backflow of steam that the maintenance inspection is necessary, so that the safety of the facility can be ensured.

As mentioned above, although one preferable embodiment of the boiler of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, although the boiler system 1 which consists of the three boilers 20 was demonstrated in the said embodiment, the number of the boilers 20 with which the boiler system 1 is provided is not restricted to three units | sets, and two or four or more boilers 20 are provided. It is good as well.

DESCRIPTION OF SYMBOLS 1 Boiler system 2 Boiler group 20 Boiler 22 Local control part 23 Backflow detection part 24 Conductivity measurement part 3 Unit control apparatus 4 Control part 41 Priority order setting part 42 Notification part 6 Steam header 11 Vertical steam pipe (steam pipe)
14 Collecting steam pipe (steam pipe)
111 Check valve

Claims (5)

A boiler group having a plurality of boilers capable of burning at different combustion rates, a steam pipe and a steam header for collecting steam output from the boiler group, and the priority set for each of the boilers A boiler system comprising a controller that controls the combustion state of the boiler group,
The plurality of boilers are
A backflow detection unit for detecting a backflow of steam from the steam header or steam pipe;
A conductivity measuring unit for measuring the electrical conductivity of the can water;
With
The said control part is a boiler system provided with the priority order setting part which changes the priority of the boiler whose electric conductivity is less than predetermined value among the boilers in which the steam is flowing backward. A boiler group having a plurality of boilers capable of burning at different combustion rates, a steam pipe and a steam header for collecting steam output from the boiler group, and the priority set for each of the boilers A boiler system comprising a controller that controls the combustion state of the boiler group,
The plurality of boilers are
A backflow detection unit for detecting a backflow of steam from the steam header or steam pipe;
A conductivity measurement unit for measuring the change in electrical conductivity of the can water after the combustion is stopped;
With
The said control part is a boiler system provided with the priority order setting part which changes the priority of the boiler in which electric conductivity fell more than predetermined | prescribed after stopping combustion among the boilers in which steam flows backward.   The said backflow detection part detects whether the steam is backflowing from the said steam header or a steam pipe based on the pressure in a can after 1st time passed after stopping combustion. The described boiler system.   The said backflow detection part detects whether the steam is backflowing from the said steam header or a steam pipe | tube based on the water level in a can after 2 time progress after stopping combustion. The boiler system according to any one of the above. The boiler system in any one of Claim 1 to 4 further equipped with the alerting | reporting part which alert | reports the boiler by which the priority was changed predetermined times by the said priority order setting part.

Images