JP6850232B2 - Combustion system - Google Patents

Description

The present invention relates to a combustion system using a combustion control device that controls combustion in the combustion device.

Conventionally, as this type of combustion system, a combustion system including a combustion device having an air supply system and a fuel supply system to the combustion chamber and a combustion control device for controlling the operation of the combustion device has been used. (See, for example, Patent Document 1).

In this combustion system, the air supply system is arranged in an air flow path, a blower that blows air, an air flow path that guides the air blown from the blower to the combustion chamber, and passes through this air flow path. It is equipped with a damper (air flow adjustment damper) that adjusts the air flow rate.

The fuel supply system is provided with a damper (fuel flow rate adjusting damper) that links with an air flow rate adjusting damper to adjust its opening position and adjusts the flow rate of fuel supplied to the combustion chamber through the fuel flow path. ing. In some cases, the air flow rate adjusting damper and the fuel flow rate adjusting damper are not linked.

Further, a wind pressure switch for detecting that the pressure of the air blown from the blower has reached a predetermined value is arranged in the air flow path, and this wind pressure switch is turned on and a damper (air flow rate adjusting damper / damper / The pre-purge time is measured starting from the time when the opening position of the fuel flow rate adjusting damper) reaches a predetermined high opening position. When the pre-purge time is completed, the opening position of the damper (air flow rate adjusting damper / fuel flow rate adjusting damper) is set to a predetermined low opening position.

Further, in this combustion system, the operation sequence from the start of the combustion device to the steady combustion is defined as a combustion sequence. For example, the operation sequence from the start of the combustion device to the steady combustion is "start check", "pre-purge", "waiting for ignition", "pilot ignition", "pilot only", "main ignition", "main stable", Each combustion sequence is defined as "steady combustion".

In addition, in this combustion system, the combustion control device monitors the state of the flame detector, etc., and when an abnormality (non-ignition or fire outage) of the combustion device is detected, the safety shutoff valve is closed and the fuel to the burner is supplied. Cut off the supply. That is, the combustion device is locked out.

Japanese Unexamined Patent Publication No. 2011-208921

However, in the conventional combustion system, although it can be seen that an abnormality has occurred in the combustion apparatus, it has been difficult to easily identify the abnormal portion in the combustion apparatus.

The present invention has been made to solve such a problem, and an object of the present invention is combustion capable of easily identifying an abnormal part in a combustion device when an abnormality occurs in the combustion device. To provide the system.

In order to achieve such an object, the present invention comprises a combustion device (22) including an air supply system (101) and a fuel supply system (102) to the combustion chamber (5), and operation of the combustion device. In a combustion system (100) equipped with a combustion control device (2) for controlling the above, a flow meter (21) configured to measure the flow rate of air to the combustion chamber (5) and air to the combustion chamber. From the damper (18) installed in the supply system of the above, the sensor units (HS, LS) configured to detect that the opening position of the damper has reached a predetermined opening position, and the combustion control device. From the issuance of a drive command to the predetermined opening position to the control motor (M) that drives the damper until the sensor unit detects that the opening position of the damper has reached the predetermined opening position. A combustion control information collecting unit (T1, T2) configured to collect combustion control information including at least the operating time of the control motor and the flow rate of air measured by the flow meter, where the time is defined as the operating time of the control motor (T1, T2). 2-1), the combustion control information storage unit (2-2) configured to accumulate the combustion control information collected by the combustion control information collection unit in chronological order, and the combustion device based on the combustion control information. Changes in the operating time of the control motor stored in the combustion control information storage unit when the abnormality determination unit (2-3) is configured to determine the presence or absence of an abnormality and the abnormality determination unit determines that there is an abnormality. It is characterized by including an abnormality location estimation unit (2-4) configured to estimate an abnormality location in the combustion apparatus based on the tendency of the above and the tendency of the change in the air flow rate measured by the flow meter. To do.

In the present invention, the abnormality determination unit determines whether or not there is an abnormality in the combustion device based on the combustion control information stored in the combustion control information storage unit. For example, if the ON time of the wind pressure switch, which turns ON when the air pressure to the combustion chamber exceeds a predetermined value, exceeds a predetermined time, it is determined that the combustion device is abnormal, or non-ignition in the combustion device is burned. It is determined that there is an abnormality in the combustion device, a fire break in the combustion apparatus is determined as an abnormality in the combustion apparatus, and a case where the operating time of the control motor is out of a predetermined range is determined as an abnormality in the combustion apparatus.

In the present invention, when the abnormality determination unit determines that there is an abnormality, the abnormality estimation unit tends to change the operating time of the control motor stored in the combustion control information storage unit, and the air measured by the flow meter. Based on the tendency of the change in the flow rate of the combustion device, the abnormal location in the combustion device is estimated. For example, the motor of the blower that sends air to the combustion chamber is estimated as an abnormal part in the combustion device, the control motor is estimated as the abnormal part in the combustion device, and the sensor unit is estimated as the abnormal part in the combustion device.

In the present invention, the abnormality location estimation unit may narrow down the abnormality location in the combustion device according to the type of abnormality of the combustion device determined by the abnormality determination unit.

In the above description, as an example, the components on the drawing corresponding to the components of the invention are indicated by reference numerals in parentheses.

As described above, according to the present invention, when the abnormality determination unit determines that there is an abnormality, it is measured by the tendency of the change in the operating time of the control motor stored in the combustion control information storage unit and the flow meter. Since the abnormal part in the combustion device is estimated based on the tendency of the change in the flow rate of the air, when an abnormality occurs in the combustion device, the abnormal part in the combustion device can be easily identified. ..

FIG. 1 is a diagram showing a main part of a combustion system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating the configuration of a combustion system using only the main burner. FIG. 3 is a time chart of the combustion sequence from the start of the combustion device to the steady combustion. FIG. 4 is a functional block diagram of a main part of the combustion control device. FIG. 5 is a diagram showing the time from when the blower is instructed to turn ON until the wind pressure switch is turned ON (the ON time of the wind pressure switch is T _ON). FIG. 6 is a diagram showing a first operating time T1 of the control motor. FIG. 7 is a diagram showing a second operating time T2 of the control motor. FIG. 8 shows the tendency of the change of the first operating time T1 and the second operating time T2 of the control motor, the tendency of the change of the air flow rate measured by the air flow meter, the abnormality generated in the combustion device, and the abnormality. It is a figure which exemplifies the table which defined the relationship with the estimated abnormality part. FIG. 9 is a diagram showing a display example of an abnormality determination result and an abnormality portion estimation result from the combustion control device in the monitoring device. FIG. 10 is a diagram showing an example in which the abnormality determination result and the abnormality estimation result obtained by the combustion control device are sent to the remote monitoring device (remote monitoring device) connected via the Internet. ..

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of an embodiment of the combustion system according to the present invention. The combustion system 100 includes a combustion device 1, a combustion control device 2, a fuel flow path 3, and an air flow path 4.

The combustion equipment 1 includes a combustion chamber 5, a main burner 6 that heats the inside of the combustion chamber 5, a pilot burner 7 that ignites the main burner 6, an ignition device (IG) 8 that ignites the pilot burner 7. It includes a flame detector 9 that detects the intensity of the flame of the burners (pilot burner 7 and the main burner 6), and a temperature sensor 10 that detects the temperature inside the combustion chamber 5.

The fuel flow path 3 is a flow path for supplying fuel to the combustion equipment 1, and is a main flow path 3a to which fuel is supplied from the outside, and a first flow path 3b and a second flow path branched from the main flow path 3a. It is composed of a road 3c. The first flow path 3b is connected to the main burner 6, and the second flow path 3c is connected to the pilot burner 7. Further, the main flow path 3a is provided with a gas pressure switch 15 and a flow meter (gas flow meter) 20, and the first flow path 3b is provided with safety shut-off valves 11 and 12 and a damper (fuel flow rate adjusting damper) 19. The second flow path 3c is provided with safety shut-off valves 13 and 14.

One end of the air flow path 4 is connected to the blower 16, and the other end is connected to the first flow path 3b. The air discharged from the blower 16 is supplied to the main burner 6 together with the fuel (gas) via the first flow path 3b. Further, the air flow path 4 is provided with a wind pressure switch (air flow switch) 17, a flow meter (air flow meter) 21, and a damper (air flow rate adjusting damper) 18.

In the air flow path 4, the air flow rate adjusting damper 18 is driven by the control motor M in a linkage with the fuel flow rate adjusting damper 19. The control motor M includes a high opening position sensor HS that detects that the opening positions of the dampers 18 and 19 have reached a predetermined high opening position, and a low that detects that the opening positions of the dampers 18 and 19 have reached a predetermined low opening position. An opening position sensor LS is provided.

The combustion control device 2 includes a gas pressure signal from the gas pressure switch 15, an air pressure signal from the wind pressure switch 17, a flame detection signal from the flame detector 9 (a signal indicating the flame intensity of the burner), and a temperature sensor 10. The temperature detection signal or the like is input, and the control signal is output to the safety shut-off valves 11 to 14, the ignition device 8, the blower 16, the dampers 18, 19 and the like. As a result, the operation of the combustion device 22 whose components are surrounded by the alternate long and short dash line in the figure is controlled.

Depending on the type of the combustion device 22, there are a type that extinguishes the flame of the pilot burner 7 when the ignition of the main burner 6 is completed, a type that continues the flame of the pilot burner 7 even after the ignition of the main burner 6, and the like. In the former type, 9 first detects the flame intensity of the pilot burner 7, and then detects the flame intensity of the main burner 6. In the latter type, the flame intensities of the pilot burner 7 and the main burner 6 are combined and detected.

In the present specification, both the pilot burner 7 and the main burner 6 are referred to as burners, and the flame detected by the flame detector 9 is referred to as a burner flame. FIG. 1 shows a type in which the flame of the pilot burner 7 is continued even after the ignition of the main burner 6, and the flame detector 9 detects the flames of the pilot burner 7 and the main burner 6 as the flame of the burner.

Further, in the combustion device 22, the air flow path 4, the blower 16, and the air flow rate adjusting damper 18 form an air supply system 101 to the combustion chamber 5, and the fuel flow path 3 (3a, 3b, 3c) and the fuel flow path 3 (3a, 3b, 3c). The safety shutoff valves 11 to 14 and the fuel flow rate adjusting damper 19 constitute a fuel supply system 102 to the combustion chamber 5.

There is also a type in which only the main burner is used without providing a pilot burner, and in that type, as shown in FIG. 2, the flow path (secondary flow) is bypassed between the inlet side and the outlet side of the main flow path 3a. A road) 3c is provided, and a fuel flow rate adjusting damper 19 is installed between the confluence of the main flow path 3a and the sub-flow path 3c on the outlet side and the burner 6. In this case, the burner 6 also serves as the main burner and the pilot burner, and the pilot burner 7 becomes unnecessary.

In this combustion system 100 (FIG. 1), the operation sequence from the start of the combustion device 22 to the steady combustion is defined as a combustion sequence. For example, "start check", "pre-purge", "waiting for ignition", "pilot ignition", "pilot only", "main ignition", "main stable" as the operation sequence from the start of the combustion device 22 to the steady combustion. , "Steady combustion", each combustion sequence is defined.

FIG. 3 shows a time chart of the combustion sequence from the start of the combustion device 22 to the steady combustion. When the combustion control device 2 has a start input (point t1 shown in FIG. 3A), the combustion control device 2 sends a drive command in the opening direction to the control motor M (point t1 shown in FIG. 3D) from the blower 16. Start blowing air to the air flow path 4 (point t1 shown in FIG. 3B). As a result, the dampers 18 and 19 are opened, and the pressure in the air flow path 4 is increased.

Then, when the pressure in the air flow path 4 increases (the pressure of the air in the combustion chamber 5 increases) and the pressure in the air flow path 4 reaches a predetermined value, the wind pressure switch 17 is turned on (FIG. 3 (c). ) T2 points). The period P1 from the t1 point to the t2 point is the time zone of the "start check".

When the combustion control device 2 detects that the wind pressure switch 17 is turned on and the high opening position sensor HS has reached the high opening position of the dampers 18 and 19 (t3 shown in FIG. 3E). Point), starting from this point in time, the time counting of the pre-purge time S1 is started.

After the lapse of the pre-purge time S1, the combustion control device 2 sends a drive command in the closing direction to the control motor M (point t4 shown in FIG. 3D). As a result, the openings of the dampers 18 and 19 are closed. The period P2 from the t3 point to the t4 point is the time zone of "pre-purge".

When the combustion control device 2 detects that the opening positions of the dampers 18 and 19 have reached the low opening position by the low opening position sensor LS (point t5 shown in FIG. 3 (f)), the predetermined waiting time S2 After the lapse of time, the safety shut-off valves (pilot valves) 13 and 14 were opened (point t6 shown in FIG. 3 (g)), the ignition device (ignition) 8 was operated (point t6 shown in FIG. 3 (h)). The pilot burner 7 is ignited (point t6 shown in FIG. 3 (i)). The period P3 from the t4 point to the t6 point is the time zone of "waiting for ignition".

When the combustion control device 2 ignites the pilot burner 7, the safety shut-off valves (main valves) 11 and 12 are opened after waiting for the elapse of the time S3, which is the sum of the pilot ignition time and the pilot only time (FIG. FIG. The main burner 6 is ignited at the t8 point shown in 3 (j) (t8 point shown in FIG. 3 (k)). In this case, the period during which the ignition device 8 is operated, that is, the period P4 from the t6 point to the t7 point shown in FIG. 3 (h) is the time zone of "pilot ignition", and the period P5 from the t7 point to the t8 point. Is the "pilot only" time zone.

When the main burner 6 is ignited, the combustion control device 2 waits for the elapse of the time S4, which is the sum of the main ignition time and the main stabilization time, and starts proportional control of the opening degrees of the dampers 18 and 19 (FIG. 6). At t10 point shown in 3 (d)), it shifts to steady combustion. Of the period from t8 to t10, the period P6 from t8 to t9 is the "main ignition" time zone, and the period P7 from t9 to t10 is the "main stable" time zone. Yes, the period P8 after the t10 point is the time zone of "steady combustion (steady combustion sequence)".

In the present embodiment, the combustion control device 2 that performs an operation according to such a combustion sequence has a "function of collecting combustion control information", a "function of accumulating the collected combustion control information", and a "combustion device". It is provided with "a function of determining an abnormality", "a function of estimating an abnormal part in a combustion device", and "a function of outputting an abnormality determination result of a combustion device and an estimation result of an abnormal part in a combustion device". FIG. 4 shows a functional block diagram of a main part of the combustion control device 2 having such a function.

The combustion control device 2 is realized by hardware including a processor and a storage device and a program that realizes various functions in cooperation with these hardware, and combustion control information is provided as a functional unit peculiar to the present embodiment. It includes a collection unit 2-1, a combustion control information storage unit 2-2, an abnormality determination unit 2-3, an abnormality location estimation unit 2-4, and an output unit 2-5.

Note that FIG. 4 shows only the functional parts specific to the present embodiment provided in the combustion control device 2. Further, in FIG. 4, the configuration of the combustion device 22 is omitted because it is shown in FIG.

In the combustion control device 2, the combustion control information collecting unit 2-1 collects combustion control information in a predetermined cycle (for example, in units of 0.1 s). In this embodiment, the start input signal (FIG. 3 (a)) indicating the operating state of the combustion device 22, the blower signal (FIG. 3 (b)) indicating the operating state of the blower 16, and the supply of air to the main burner 6 are provided. A signal indicating the state (FIG. 3 (c)), a high opening position detection signal indicating the arrival of the dampers 18 and 19 at the high opening position (FIG. 3 (e)), and the low opening positions of the dampers 18 and 19. Low opening position detection signal (FIG. 3 (f)) indicating the arrival of the fuel, a signal indicating the fuel supply state to the pilot burner 7 (FIG. 3 (g)), and a signal indicating the operating state of the ignition device (ignition) 8. (FIG. 3 (h)), a signal indicating the fuel supply status to the main burner 6 (FIG. 3 (j)), and the flame intensity of the burners (pilot burner 7 and main burner 6) detected by the flame detector 9. The flame detection signal indicating the above, the flow rate of fuel gas measured by the gas flow meter 20, the flow rate of air measured by the air flow meter 21, and the like are collected as combustion control information, for example, in units of 0.1 s.

The combustion control device 2 acquires a flame detection signal from the flame detector 9 as a frame voltage, and determines the presence or absence of a flame, an ignition abnormality, or the like from the value of the frame voltage. The combustion control information collected by the combustion control information collecting unit 2-1 includes information indicating the presence or absence of a flame determined by the combustion control device 2, information indicating non-ignition, information indicating a fire breakage, frame voltage, and the like.

Further, the combustion control information collecting unit 2-1 burns after issuing an air supply start command to the air supply system 101, that is, the time from when the blower 16 is instructed to turn on until the wind pressure switch 17 is turned on. The time until the wind pressure switch 17 detects that the air pressure to the chamber 5 exceeds a predetermined value (first threshold value) (the time from the t1 point to the t2 point shown in FIG. 3) is determined by the wind pressure switch 17. and oN time T _oN, also collected as combustion control information about the oN time T _oN of the air pressure switch 17. _{FIG. 5 shows the ON time T ON} of the wind pressure switch 17 in FIG. 3 extracted.

Further, in the combustion control information collecting unit 2-1 after the combustion control device 2 issues a drive command to the control motor M to the high opening position, the opening positions of the dampers 18 and 19 are the low opening positions. The time until the high opening position sensor HS detects that the high opening position has been reached (the time from the t1 point to the t3 point shown in FIG. 3) is set as the first operating time T1 of the control motor M, and combustion is performed. After the control device 2 issues a drive command to the control motor M to the low opening position, the low opening indicates that the opening positions of the dampers 18 and 19 have reached the low opening position from the high opening position. The time until the position sensor LS detects (the time from the t4 point to the t5 point shown in FIG. 3) is defined as the second operating time T2 of the control motor M, and the first operating time T1 and the second of the control motor M. The operating time T2 of the above is also collected as combustion control information. FIG. 6 shows the first operating time T1 of the control motor M, and FIG. 7 shows the second operating time T2 of the control motor M in FIG. 3 extracted.

Note that FIG. 3 shows a combustion sequence from the start of the combustion device 22 to the steady combustion, and even when the combustion device 22 is stopped, the combustion is stopped according to a predetermined combustion sequence.

The combustion control information collected by the combustion control information collection unit 2-1 is accumulated in the combustion control information storage unit 2-2 in chronological order. The abnormality determination unit 2-3 determines whether or not there is an abnormality in the combustion device 22 based on the combustion control information stored in the combustion control information storage unit 2-2.

In this embodiment, the abnormality determination unit 2-3, if ON time T _ON of a predetermined time of the air pressure switch 17 (e.g., 3 minutes) if it exceeds the air pressure switch 17 or during combustion, is turned OFF It is determined that the combustion device 22 is abnormal (hereinafter, this abnormality is referred to as a wind pressure abnormality). Further, the abnormality determination unit 2-3 determines that the combustion device 22 is abnormal when non-ignition or fire breakage occurs.

Further, the abnormality determination unit 2-3 determines that the first operating time T1 of the control motor M deviates from a predetermined range as an abnormality of the combustion device 22 (hereinafter, this abnormality is referred to as a high fuel IL abnormality). .. Further, the abnormality determination unit 2-3 determines that the second operating time T2 of the control motor M deviates from a predetermined range as an abnormality of the combustion device 22 (hereinafter, this abnormality is referred to as a low fuel IL abnormality). ..

When the abnormality determination unit 2-3 determines that there is an abnormality, the abnormality location estimation unit 2-4 determines the abnormality location in the combustion device 22 based on the combustion control information stored in the combustion control information storage unit 2-2. presume. The estimation of the abnormal part by the abnormal part estimation unit 2-4 will be described later.

The output unit 2-5 outputs the abnormality determination result obtained by the abnormality determination unit 2-3 and the abnormality location estimation result by the abnormality location estimation unit 2-4 to the monitoring device 23.

The monitoring device 23 includes a display unit 23-1 that displays a monitoring screen on the display, and an abnormality determination result and an abnormality portion sent from the combustion control device 2 on the monitoring screen displayed by the display unit 23-1. Display the estimation result.

[Estimation of abnormal location]
When the abnormality determination unit 2-3 determines that there is an abnormality, the abnormality location estimation unit 2-4 determines the abnormality location in the combustion device 22 based on the combustion control information stored in the combustion control information storage unit 2-2. presume. Hereinafter, the estimation of the abnormal portion by the abnormal portion estimation unit 2-4 will be specifically described.

The abnormality location estimation unit 2-4 has a tendency of change in the first operating time T1 and a second operating time T2 of the control motor M, a tendency of change in the air flow rate measured by the air flow meter 21, and a tendency of change in the air flow rate. A table TB is provided that defines the relationship between the abnormality generated in the combustion device 22 and the estimated abnormality location.

FIG. 8 shows an example of this table TB. When the abnormality determination unit 2-3 determines that there is an abnormality, the abnormality location estimation unit 2-4 estimates the abnormality location in the combustion device 22 according to the relationship defined in this table (abnormality location estimation table) TB.

[In case of non-ignition or fire break]
When the determination result in the abnormality determination unit 2-3 is "non-ignition" or "fire outage", the abnormality location estimation unit 2-4 corresponds to "case 1" to "case 9" in the table TB. Judge.

In this case, the abnormality location estimation unit 2-4 changes the first operating time T1 and the second operating time T2 of the control motor M in the combustion control information stored in the combustion control information storage unit 2-2. The tendency and the tendency of the change in the air flow rate measured by the air flow meter 21 are obtained. In this embodiment, a certain period in the past until the occurrence of an abnormality is set as a target period, and from the normal state of the first operating time T1 and the second operating time T2 of the control motor M within this target period. The tendency of the change of the air flow rate measured by the air flow meter 21 and the tendency of the change of the air flow rate from the normal state are referred to as "normal", "long", "short", "more", and "less". Ask.

Here, if the tendency of the change of the first operating time T1 and the second operating time T2 and the tendency of the change of the air flow rate are all "normal" (case 1), the abnormality location estimation unit 2-4 It is presumed that the abnormality is other than the air supply system 101.

If the tendency of the change of the first operating time T1 and the second operating time T2 is "normal" and the tendency of the change of the air flow rate is "large" (case 2), the abnormality location estimation unit 2-4 Is presumed to be an abnormality of the blower motor (increased rotation speed) or an abnormality of the switches (HS, LS) (positional deviation in the opening direction).

If the tendency of the change of the first operating time T1 and the second operating time T2 is "normal" and the tendency of the change of the air flow rate is "small" (case 3), the abnormality location estimation unit 2-4 Is presumed to be an abnormality of the blower motor (decrease in rotation speed or clogging of the filter of the blower motor).

The tendency of the change of the first operating time T1 is "normal" or "long", the tendency of the change of the second operating time T2 is "long", and the tendency of the change of the air flow rate is "small". If there is (Case 4), the abnormality location estimation unit 2-4 estimates that the switch (LS) is abnormal (positional deviation in the closing direction or OFF failure).

The tendency of the change of the first operating time T1 is "long", the tendency of the change of the second operating time T2 is "normal" or "long", and the tendency of the change of the air flow rate is "many". If there is (Case 5), the abnormality location estimation unit 2-4 estimates that the switch (HS) is abnormal (positional deviation in the opening direction or OFF failure).

If the tendency of the change of the first operating time T1 is "normal", the tendency of the change of the second operating time T2 is "long", and the tendency of the change of the air flow rate is "many" (case). 6) The abnormality location estimation unit 2-4 estimates that the abnormality is a complex abnormality of the blower motor, the control motor, and the switch (HS, LS).

If the tendency of the change of the first operating time T1 is "long", the tendency of the change of the second operating time T2 is "normal", and the tendency of the change of the air flow rate is "small" (case). 7) The abnormality location estimation unit 2-4 estimates that the abnormality is a complex abnormality of the blower motor, the control motor, and the switch (HS, LS).

If the tendency of the change of the first operating time T1 and the second operating time T2 is both "short" and the tendency of the change of the air flow rate is "large" (Case 8), the abnormality location estimation unit 2- 4 is presumed to be an abnormality of the switch (LS) (positional deviation in the opening direction or ON failure).

If the tendency of the change of the first operating time T1 and the second operating time T2 is both "short" and the tendency of the change of the air flow rate is "small" (Case 9), the abnormality location estimation unit 2- 4 is presumed to be an abnormality of the switch (HS) (positional deviation in the closing direction or ON failure).

[In case of abnormal wind pressure]
When the determination result in the abnormality determination unit 2-3 is "wind pressure abnormality", the abnormality location estimation unit 2-4 determines that it corresponds to "case 10" and "case 11" in the table TB.

In this case as well, as described above, the abnormality location estimation unit 2-4 uses the combustion control information stored in the combustion control information storage unit 2-2 to perform the first operation time T1 and the second operation of the control motor M. The tendency of the change of the time T2 and the tendency of the change of the air flow rate measured by the air flow meter 21 are obtained.

Here, if the tendency of the change of the first operating time T1 and the second operating time T2 is both "normal" and the tendency of the change of the air flow rate is "small" (case 10), the abnormal location is estimated. Part 2-4 is presumed to be an abnormality of the blower motor (decrease in rotation speed, insufficient power supply) or an abnormality of the switches (HS, LS) (positional deviation in the closing direction).

If the tendency of the change of the first operating time T1 and the second operating time T2 is both "long" and the tendency of the change of the air flow rate is "small" (Case 11), the abnormality location estimation unit 2- 4 is presumed to be an abnormality of the switch (LS) (positional deviation in the closing direction or OFF failure).

[In case of high fuel IL abnormality, low fuel IL abnormality]
When the determination result in the abnormality determination unit 2-3 is "high fuel IL abnormality" or "low fuel IL abnormality", the abnormality location estimation unit 2-4 displays "case 12" to "case 13" in the table TB. It is judged that it corresponds to.

In this case as well, as described above, the abnormality location estimation unit 2-4 uses the combustion control information stored in the combustion control information storage unit 2-2 to perform the first operation time T1 and the second operation of the control motor M. The tendency of the change of the time T2 and the tendency of the change of the air flow rate measured by the air flow meter 21 are obtained.

Here, if the first operating time T1 and the second operating time T2 both tend to be "normal / long / short" and the tendency of the change in air flow rate is "normal" (case 12), the abnormal location. The estimation unit 2-4 estimates that the gear is worn or the control motor is abnormal (malfunction).

If the tendency of the change of the first operating time T1 and the second operating time T2 is both "long" and the tendency of the change of the air flow rate is "large" (Case 13), the abnormality location estimation unit 2- 4 is presumed to be an abnormality of the switch (HS) (positional deviation in the opening direction or OFF failure).

If the tendency of the change of the first operating time T1 and the second operating time T2 is both "long" and the tendency of the change of the air flow rate is "small" (Case 14), the abnormality location estimation unit 2- 4 is presumed to be an abnormality of the switch (LS) (positional deviation in the closing direction or OFF failure).

The abnormality determination result obtained by the abnormality determination unit 2-3 and the abnormality location estimation result obtained by the abnormality location estimation unit 2-4 are sent to the output unit 2-5.

The output unit 2-5 outputs the abnormality determination result obtained by the abnormality determination unit 2-3 and the abnormality location estimation result obtained by the abnormality location estimation unit 2-4 to the monitoring device 23. The monitoring device 23 displays the abnormality determination result and the abnormality estimation result sent from the combustion control device 2 on the monitoring screen.

FIG. 9 shows a display example of the abnormality determination result and the abnormality estimation result from the combustion control device 2 in the monitoring device 23. In this example, the message column G1 of the abnormality information is displayed, and the abnormality determination result and the estimated abnormality location are displayed in characters in the message column G1 of the abnormality information.

In this way, according to the present embodiment, after the drive command to the high opening position is issued to the control motor M, the opening positions of the dampers 18 and 19 change from the low opening position to the high opening position. The time until the high opening position sensor HS detects that the position has been reached is the operating time T1 of the control motor M, and the opening positions of the dampers 18 and 19 are set after the drive command to the low opening position is issued. The time until the low opening position sensor LS detects that the high opening position has reached the low opening position is defined as the operating time T2 of the control motor M, and is measured by the operating times T1 and T2 and the flow meter 21. When combustion control information including at least the flow rate of air is collected and accumulated and an abnormality occurs in the combustion device 22, the accumulated tendency of changes in the operating times T1 and T2 of the control motor M and the measured air By estimating the abnormal portion in the combustion device 22 based on the tendency of the change in the flow rate, it is possible to easily identify the abnormal portion in the combustion device 22.

In the above-described embodiment, the monitoring device 23 is provided separately from the combustion control device 2, and the abnormality determination result and the abnormality location obtained by the combustion control device 2 are displayed on the screen (monitoring screen) of the monitoring device 23. Although the estimation result is displayed, a display unit for displaying a monitoring screen is provided in the combustion control device 2, and the monitoring screen displayed by this display unit shows the abnormality determination result and the abnormality location obtained by the combustion control device 2. The estimation result of may be displayed.

Further, as shown in FIG. 10, a transmission unit 2-7 is provided in the combustion control device 2, and combustion control is performed from the transmission unit 2-7 to a remote monitoring device (remote monitoring device) 23 via the Internet 30. The abnormality determination result and the abnormality estimation result obtained by the device 2 may be sent and displayed on the screen (monitoring screen) of the monitoring device 23.

Further, in the above-described embodiment, the abnormality determination unit 2-3 and the abnormality location estimation unit 2-4 are provided in the combustion control device 2, but they do not necessarily have to be provided in the combustion control device 2, and combustion. A diagnostic device may be provided separately from the control device 2, and a similar function may be provided in the diagnostic device.

[Extension of Embodiment]
Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present invention within the scope of the technical idea of the present invention.

1 ... Combustion equipment, 2 ... Combustion control device, 2-1 ... Combustion control information collection unit, 2-2 ... Combustion control information storage unit, 2-3 ... Abnormality determination unit, 2-4 ... Abnormality location estimation unit, 2- 5 ... Output unit, 3 ... Fuel flow path, 4 ... Air flow path, 5 ... Combustion chamber, 6 ... Main burner, 7 ... Pilot burner, 8 ... Ignition device (ignition), 9 ... Flame detector, 11-14 ... Safety shutoff valve, 15 ... gas pressure switch, 16 ... blower, 17 ... wind pressure switch (air flow switch), 18 ... air flow rate adjustment damper, 19 ... fuel flow rate adjustment damper, 20 ... gas flow meter, 21 ... air flow rate Total, 22 ... Combustion device, 100 ... Combustion system, 101 ... Air supply system, 102 ... Fuel supply system, HS ... High opening position sensor, LS ... Low opening position sensor, M ... Control motor, TB ... Table (Abnormal part estimation table).

Claims (10)

In a combustion system including a combustion device including an air supply system and a fuel supply system to a combustion chamber, and a combustion control device for controlling the operation of the combustion device.
A flow meter configured to measure the flow rate of air into the combustion chamber,
A damper installed in the air supply system to the combustion chamber and
A sensor unit configured to detect that the opening position of the damper has reached a predetermined opening position, and
After the combustion control device issues a drive command to the predetermined opening position to the control motor for driving the damper, the opening position of the damper reaches the predetermined opening position. Combustion control configured to collect combustion control information including at least the operating time of the control motor and the flow rate of air measured by the flow meter, with the time until detection by the sensor unit as the operating time of the control motor. Information gathering department and
A combustion control information storage unit configured to accumulate combustion control information collected by the combustion control information collection unit in chronological order, and a combustion control information storage unit.
An abnormality determination unit configured to determine the presence or absence of an abnormality in the combustion device based on the combustion control information.
When the abnormality determination unit determines that there is an abnormality, the tendency of the change in the operating time of the control motor stored in the combustion control information storage unit and the tendency of the change in the air flow rate measured by the flow meter. A combustion system including an abnormal location estimation unit configured to estimate an abnormal location in the combustion apparatus based on the above. In the combustion system according to claim 1,
The sensor unit
A high opening position sensor that detects that the opening position of the damper has reached a predetermined high opening position, and
It is equipped with a low opening position sensor that detects that the opening position of the damper has reached a predetermined low opening position.
The combustion control information collecting unit
After a drive command to the high opening position is issued from the combustion control device to the control motor for driving the damper, the opening position of the damper reaches the high opening position from the low opening position. The time until the high opening position sensor detects this is set as the first operating time of the control motor, and the control motor for driving the damper is driven from the combustion control device to the low opening position. The time from when the command is issued until the low opening position sensor detects that the opening position of the damper has reached the low opening position from the high opening position is the second time of the control motor. As the operating time, combustion control information including at least the first operating time and the second operating time of the control motor and the flow rate of air measured by the flow meter is collected.
The abnormality location estimation unit
When the abnormality determination unit determines that there is an abnormality, it is measured by the tendency of changes in the first operating time and the second operating time of the control motor stored in the combustion control information storage unit, and by the flow meter. A combustion system characterized in that an abnormal portion in the combustion apparatus is estimated based on a tendency of a change in the flow rate of air. In the combustion system according to claim 1 or 2.
The abnormality location estimation unit
A combustion system characterized in that the motor of a blower that sends air to the combustion chamber is estimated as an abnormal location in the combustion apparatus. In the combustion system according to claim 1 or 2.
The abnormality location estimation unit
A combustion system characterized in that the sensor unit is estimated as an abnormal portion in the combustion device. In the combustion system according to claim 1 or 2.
The abnormality location estimation unit
A combustion system characterized in that the control motor is estimated as an abnormal location in the combustion apparatus. In the combustion system according to any one of claims 1 to 5.
A wind pressure switch that turns on when the pressure of air to the combustion chamber exceeds a predetermined value is provided.
The abnormality determination unit
When the time from when the combustion control device issues an air supply start command to the air supply system until the wind pressure switch is turned on exceeds a predetermined time, or when the wind pressure switch is turned on during combustion. A combustion system characterized in that when it is turned off, it is determined that the combustion device is abnormal. In the combustion system according to any one of claims 1 to 5.
The abnormality determination unit
A combustion system characterized in that non-ignition in the combustion device is determined as an abnormality of the combustion device. In the combustion system according to any one of claims 1 to 5.
The abnormality determination unit
A combustion system characterized in that a fire break in the combustion device is determined to be an abnormality of the combustion device. In the combustion system according to any one of claims 1 to 5.
The abnormality determination unit
A combustion system characterized in that when the operating time of the control motor deviates from a predetermined range, it is determined that the combustion device is abnormal. In the combustion system according to any one of claims 1 to 9.
The abnormality location estimation unit
A combustion system characterized in that an abnormal part in the combustion device is narrowed down according to the type of abnormality of the combustion device determined by the abnormality determination unit.

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