JPH0348404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blow detection device for detecting the discharge of can water (hereinafter referred to as blowing) in a boiler system, and particularly relates to a period of rise in the can water level during water supply work after blowing. The present invention relates to a novel blow detection device that detects whether a predetermined blow has been executed based on the following.

Generally, when a boiler system is operated for a long period of time, the canned water becomes concentrated, which increases the concentration of impurities such as calcium, magnesium, and silica contained in the canned water, which precipitates and adheres to the water pipes and grows into scale. It is.

Since scale is a poor conductor of heat, the adhesion of scale not only reduces the efficiency of heat exchange in the boiler system, but also causes the water pipes to reach high temperatures.
It is known that this can eventually lead to burnout.

Similarly, the concentration of impurities such as can cleaning agents increases, which induces a bubble layer in the can water, and the bubbles in the bubble layer turn into water and mix into the steam, causing carryover. It is also known that this can cause damage to related equipment such as valves connected to the boiler system. In order to prevent such scale growth and carryover, the canned water is blown and replaced with new canned water when the concentration of the canned water has progressed to a certain extent.The number and timing of this is determined by the boiler In terms of system operation management, it was necessary to record this information, especially as basic data for determining when the next blowing operation should be performed.

However, in conventional boiler systems, when performing blowing operations, it was necessary to manually record the number and timing of blowing operations in an operation logbook, etc., which was a tedious task. Historical data regarding blowing operations is lost, and the timing of blowing operations cannot be properly determined, which can lead to significant concentration of canned water, allowing scale growth, frequent carry-overs, and resulting However, the disadvantage was that there was an extremely high risk of damaging the equipment.

The purpose of the present invention is to solve the problem of determining the timing of blowing work etc. based on the above-mentioned conventional technology, and with regard to the rising period of canned water level during water supply work after blowing, from the start of water supply to the time when water supply is stopped. By measuring and comparing the time to reach a given water level and the time for the water level to rise in a given water level section, and outputting a blow detection signal when predetermined conditions are met,
It is an object of the present invention to provide a blow detection device for a boiler system that eliminates the above drawbacks, automatically detects the execution of blowing up to a predetermined level, and enables automatic recording of historical data regarding blowing operations.

The configuration of the present invention in accordance with the above object includes at least a blowing means for controlling the discharge (blow) of canned water in the boiler, and a water supplying means for supplying canned water to the boiler in response to a water supply command signal _S0 . In the boiler system, measurement water level sensors 2a and 2f detect that the can water level in the boiler is present at the measurement setting position A and output a measurement water level signal _S1 , and the can water level in the boiler is detected at the measurement setting position A. Measurement water level sensor 2b, 2 that detects the presence at measurement setting position B, which is a different position from setting position A, and outputs a measurement water level signal _S2 .
g, an initial water supply time measurement unit that measures the time difference between the water supply command signal _S0 and the measured water level signal _S2 , and a water supply time measurement unit that measures the time difference between the water supply command signal S0 and the measured water level signal S2, and starts or ends the water supply time when the canned water level reaches the measurement setting water level A. Identified comparative water supply time Ta
A predetermined blow state is determined based on the comparison water supply time measurement section that measures the initial water supply time measurement section, the output signal _S8 from the initial water supply time measurement section, and the output signal _S7 from the comparison water supply time measurement section, and a blow signal S _B is output. This is a blow detection device for a boiler system, characterized by comprising a comparison/discrimination section that performs the following operations.

Now, before explaining the subsequent embodiments of the present invention, the structure and operation of a typical small boiler system to which the structure of the present invention can be attached will be explained as follows.

FIG. 1A is a block explanatory diagram showing the configuration of such a boiler system, and a cross section of the boiler 1 is shown. FIG. 1B is a sectional view taken along the line AA in FIG. 1A.

In the figure, inside a boiler 1, a large number of water pipes 1b are installed along the inner peripheral surface of a wall 1a.
b consists of a hollow cylindrical body, its lower end communicates with the annular lower header 1c (water chamber), and its upper end communicates with the annular upper header 1d (steam chamber), respectively. Canned water is stored in the lower part of 1c and water pipe 1b.

A combustion chamber 1e is formed in the center of the boiler 1 surrounded by water pipes 1b, and an electric motor 1f is provided above the combustion chamber 1e.
An air passage 1h is provided which communicates with a blower 1g driven by a blower 1g, and a nozzle rod 1i and an electrode rod 1j are vertically provided within the air passage 1h.

The lower end of the combustion chamber 1e communicates with the flue 1k through the hollow portions of a large number of water pipes 1b. A communication pipe 1l extends from the upper header 1d to the outside of the lower header 1a.
Connects to c.

A water level gauge 1m and a water level detector 2 for visually displaying the canned water level are installed in the middle of the communication pipe 1l. A water supply control section 3 is connected to the water level detection section 2 , and an output terminal thereof is connected to an electric motor 4 a that drives a water supply pump 4 . An inlet pipe of the water supply pump 4 communicates with a water source (not shown), and a discharge pipe thereof communicates with the lower header 1c.

Further, a pressure detection section 5 is connected to the upper part of the communication pipe 1l, and its output terminal is connected to a combustion control section 6. From the combustion control unit 6, control signal lines 6a to 6
c extends and is connected to each of the electric motor 1f, electrode rod 1j, and fuel pump 6d. An inlet pipe of the fuel pump 6d communicates with a fuel tank (not shown), and a discharge pipe thereof communicates with the nozzle rod 1i. A blow pipe 1n extends from the lower header 1c and communicates with a drainage channel (not shown) via a blower stock 1p, and a steam pipe 1q extends from the upper header 1b and communicates with a desired steam load (not shown).

In the configuration of the boiler system described above, when generating steam, the electric motor 1f drives the blower 1g to forcefully feed air into the air passage 1h while applying a high voltage to the electrode rod 1j to generate steam from the tip of the nozzle rod 1i. The injected fuel is ignited and combusted within the combustion chamber 1e. High-temperature combustion gas generated by such combustion enters the hollow part of the water pipe 1b from the lower end of the combustion chamber 1e, passes through this, reaches the flue 1k, and is exhausted. During this time, heat exchange takes place and the canned water in the water pipe 1b is heated and turned into steam, which is then transferred to the upper header 1d.
The steam is collected and stored at the steam pipe 1q and supplied to the steam load through the steam pipe 1q.

Regarding combustion control, the upper header 1d
The steam pressure in the upper header 1d is extracted through the communication pipe 1l and supplied to the pressure detector 5.
When the combustion control section detects that the vapor pressure within the combustion chamber has reached a preset lower limit vapor pressure, the lower limit vapor pressure signal is sent to the combustion control section. Send to 6.

When the combustion control unit 6 receives a lower limit steam pressure signal from the pressure detection unit 5 due to continued consumption of steam and the steam pressure in the upper header 1d falls, the combustion control unit 6 connects the control signal line 6 to the lower limit steam pressure signal from the pressure detection unit 5.
Start electric motor 1f through a, and blower 1g
After the air passage 1h is air-barged, a high voltage is applied to the electrode rod 1j through the control signal line 6b, and the fuel pump 6d is applied through the control signal line 6c.
starts, the fuel injected from the nozzle rod 1i is ignited to start combustion, and further, when steam generation continues and the steam pressure increases and an upper limit steam pressure signal is received from the pressure detection section 5, Combustion is stopped by stopping the fuel pump 6d and cutting off the fuel supply through the control signal line 6c, and after waiting for combustion gas to be discharged, the electric motor 1 is connected through the control signal line 6a.
Stop f and cut off the air from blower 1g.

Thus, even with intermittent control of combustion, the steam pressure in the upper header 1d can be maintained at a pressure value between the two pressure values preset as the upper and lower steam pressure limits.

In addition, in a simple device, the start/stop control of the electric motor 1f and the fuel pump 6d, and the application of high voltage to the electrode rod 1j may be performed simultaneously.

Furthermore, regarding water supply control, changes in the canned water level in the air-water interface in the communication pipe 1l, that is, in the water pipe 1b, are transmitted to the water level detection section 2, and the water level detection section 2 detects the canned water level set in advance. When it is detected that the lower limit water level has been reached, a lower limit water level signal is sent to the water supply control unit 3, and similarly, when it is detected that the upper limit water level has been reached, an upper limit water level signal is sent to the water supply control unit 3.

When the canned water level in the water pipe drops due to steam consumption and a lower limit water level signal is received from the water level detection unit 2, the water supply control unit 3 starts the electric motor 4a and causes the water supply pump 4 to lower the water pipe through the lower header 1c. 1
When the water supply to b is started, water supply continues, the can water level rises, and an upper limit water level signal is received from the water level detector 2, the electric motor 4a is stopped to cut off the water supply to the water pipe 1b.

Thus, even with the intermittent water supply control, the water level of the canned water in the water pipe 1b can be maintained at a water level value between the upper and lower water levels preset as the upper and lower limit water levels.

The intermittent control of water supply and the intermittent control of combustion are performed separately and independently from each other.

Also, when blowing canned water, blow 1p
By opening it, part or all of the canned water in the lower header 1c and the water pipe 1b can be blown out through the drain pipe 1n.

In addition, blower 1g, air passage 1h, nozzle rod 1i,
The burner consisting of the electrode rod 1j is not limited to this, and if necessary, it is sufficient to heat the canned water in the water pipe 1b to generate steam, so in general, an electric heater or the like is used. Any heating device that includes the above may be used.

Similarly, the combustion control section 6 may also be a heating control section that turns on and off the heating device.

Next, the configuration and operation of an embodiment of the present invention will be described below based on FIGS. 2 to 4.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.
WL is expressed by replacing the water level in the communication pipe 1l with the canned water level in the corresponding water pipe, and for the sake of simplicity, a hypothetical water pipe 1b' with a simple shape is shown as the water pipe. ing.

In addition, an expanded portion 1 formed at the bottom of the water pipe 1b'
c' is an equivalent representation of the lower header 1c in a hypothetical simple shape.

The water level detection unit 2 includes a lower limit water level probe 2a disposed such that its tip is located at a lower limit setting position A for canned water in intermittent water supply control, and a lower limit water level probe 2a disposed at a lower limit setting position A for canned water in intermittent water supply control.
a measurement water level probe 2b disposed so that its tip is located at the measurement setting position B below the can; an upper limit water level probe 2c disposed so that its tip is located at the upper limit position H of canned water; The underwater electrode 2d buried in the water, the AC power source 2e whose one end is connected to the underwater electrode 2d, the other end of the AC power source 2e, the lower limit water level probe 2a, the measurement water level probe 2b, and the upper limit water level probe 2c, respectively. It consists of current detectors 2f, 2g, and 2h inserted between them.

The water supply control section 3 includes a flip-flop 3b, in which the output terminal of the current detector 2f is connected to its set terminal, and the output terminal of the current detector 2h is connected to its reset terminal through an inverter 3a, and a positive phase output of the flip-flop 3b. The terminal is driver 3c
and the other end is connected to the power supply 3.
d, and relay 3e connected to relay 3e.
The contact 3e' of e is the electric motor 4 that drives the water supply pump 4.
It is inserted into the power supply line 4b of a.

The empty can state detection section 8 includes an initial water supply time measurement section 8b, a comparison water supply time measurement section 8a, and a comparison determination section 8c.The initial water supply time measurement section 8b receives a water supply command signal S ₀
and the measured water level signal S ₂ are respectively input signals, and the water supply command signal S ₀ is "0" and the measured water level signal S ₂ is "0".
Only when the clock signal _S10 is supplied to the counter 8d, the initial water supply time is determined by this counter 8d.
Tb is measured and an initial water supply time signal _S8 is output.

In addition, the comparative water supply time measuring section 8a receives a water supply command signal _S2.
and the measured water level signal S ₁ are respectively input signals, and the water supply command signal S ₀ is "0" and the measured water level signal S ₁ is "0".
Only when the clock signal _S11 is supplied to the counter 8e, the comparative water supply time is calculated by this counter 8e.
Ta is measured and a comparison water supply time signal _S7 is output.

Further, the comparison and determination section 8c receives the initial water supply time signal _S8 .
Using the comparison water supply time signal _S7 as an input signal, the ratio of the comparison water supply time Ta to the initial water supply time Tb (Ta/
Tb) is determined, and when this value becomes less than a preset ratio, a complete blow signal S _B is output under the condition that the measured water level signal S ₁ is "1".

Figure 3 shows change A in can water level and current detector 2.
3 is a waveform diagram showing a comparison between output signals B and C of flip-flops h and 2f and a positive phase output signal D of a flip-flop 3b. FIG. First, the operation of water supply control with respect to the water level detection section 2 and water supply control section 3 in the above configuration will be explained as follows.

Now, as shown in Figure 3 Aa, if the canned water level is higher than the lower limit setting position A,
The lower limit water level probe 2a is submerged in the can water, and conduction is established between it and the underwater electrode 2d through the can water,
Since a load circuit consisting of a current detector 2f, a lower limit water level probe 2a, and an underwater electrode 2d is formed for the AC power source 2e, a current flows through the current detector 2f,
Detecting this, the current detector 2f outputs "1" as shown in FIG. 3Cb.

Then, when the water level of the can water falls and reaches the lower limit setting position A as shown in FIG. Therefore, the current passing through the current detector 2f becomes zero, and upon detecting this, the current detector 2f outputs "0" as shown in FIG. 3Cd.

Upon receiving the inversion of the output signal of the current detector 2f from "1" to "0" at the set terminal, the flip-flop 3b is set to "1", and its positive phase output signal is shown in FIG. It is inverted from "0" to "1". Upon receiving this signal, the driver 3c becomes conductive, the relay 3e is energized, the contact 3e' is closed, and power is supplied to the motor 4a through the water supply command switch 8f', which is closed at this point. Therefore, canned water is supplied to the water pipe 1b'.

Thus, while the flip-flop 3b is at "1", water supply continues and the can water level continues to rise as shown in FIG. 3Af.

Eventually, as shown in Fig. 3Ag, when the can water level reaches the upper limit setting position H, the upper limit water level probe 2c is submerged, and since it has been far from the water surface until now, as shown in Fig. 3Bh Like, "0"
The current detector 2h, which had been outputting ``1'', now outputs ``1'' as shown in FIG. 3B.

The inversion of the output signal of the current detector 2h from ``0'' to ``1'' is converted by the inverter 3a into an inversion from ``1'' to ``0'' and supplied to the reset terminal of the flip-flop 3b. "0"
Reset to .

Therefore, as shown in FIG. 3Dj, the positive phase output signal of flip-flop 3b becomes "0", so
Relay 3e becomes de-energized, contact 3e' opens, and water supply stops.

Thereafter, similar operations are repeated to maintain the can water level between the upper limit setting position H and the lower limit setting position L.

Next, with reference to FIG. 4, the operation for detecting a complete blow during blowing work will be described as follows.

When performing blowing work, the operator
p is opened and the water supply command switches 8f and 8f' are opened, and the relay contact 3 in the water supply control section 3 is opened.
Regardless of the intermittent operation of e', when the power supply to the electric motor 4a is cut off and the water supply pump 4 is stopped, the canned water in the water pipe 1b' is drained at a large flow rate through the drain pipe 1n. As shown in A a, the can water level begins to fall rapidly.

After performing complete blowing, the operator closes the blower stock 1p after performing inspection and maintenance inside the boiler as necessary, and then switches the water supply command switch 8f,
When a water supply command signal _S0 is given by closing 8f', the electric motor 4a for driving the water supply pump 4 is activated.
The power supply is now controlled by the opening and closing of the relay contact 3e', and the water supply intermittent control operation is started.

At this point, regarding the intermittent control of the water supply, since the water level in the can is far below the lower limit setting position A, the intermittent control operation is performed, relay contact 3e' closes, and the water is supplied to the boiler. Canned water supply will begin.

At the same time, the water supply command switch 8f is closed and grounded, giving the water supply command signal _S0 , and since the measured water level signals _S1 and _S2 are "0", clocks are sent to the counters 8d and 8e, respectively. signal
S ₁₀ and S ₁₁ are supplied, and measurement of the initial water supply time and comparative water supply time is started.

On the other hand, when water supply starts, the canned water level rises at a slow rate according to the water supply flow rate, as shown in Fig. 4Ak. Since the lower header 1c, which has a wide cross-sectional area equivalently expressed as 1c', is filled with canned water, the rate of rise is extremely slow, and it takes a long time for the canned water level to rise.

After the lower header 1c is filled with canned water, the water pipe 1b, which has a smaller cross-sectional area, is filled, so the canned water level increases at a relatively fast rate, as shown in Figure 4A. Rise.

Then, when the can water level reaches the measurement setting position B as shown in Fig. 4 A m, the can water level reaches the measurement setting position B as shown in Fig. 4 C n
As shown in , the output signal of the current detection section 2g is inverted from "0" to "1" and outputs the measured water level signal _S2 .

As a result, the supply of the clock signal _S10 to the initial water supply time measuring section 8b is cut off, and the initial water supply time measurement is completed.

The water level will continue to rise, and comparative water supply time measurements will continue. When the can water level reaches the measurement setting position A, that is, the lower limit water level, as shown in p of Fig. 4A, the current detector 2 is activated as shown in Fig. 4Bq.
The output signal of f is inverted from "0" to "1" and outputs the measured water level signal _S1 . As a result, the supply of the clock signal _S11 to the comparative water supply time measuring section 8a is cut off, and the comparison water supply time measurement is completed.

Initial water supply period signal S ₈ from counters 8d and 8e
and the comparison water supply period signal _S7 is led into the comparison/determination section 8c, and the comparison water supply time Ta is determined with respect to the initial water supply time Tb.
_The ratio (Ta/Tb) of
A complete blow signal S _B is output under the condition that is "1".

Now, suppose that for some reason, the water supply is not completely blown and the water level in the can is not zero, as shown in Figure 4At, that is, the water supply is started from a state where canned water remains. , Figure 4A
As shown in k', the can water level rises while missing some or all of the period required to fill the lower header 1c, so the time required to rise to the measurement setting position B is shortened. .

However, since the time required for the water level to rise from the measurement setting position B to the measurement setting position A does not change, the ratio of the comparative water supply time Ta to the initial water supply time Tb (Ta/Tb) is lower than that during complete blowing. growing. Therefore, if the relationship between the initial water supply time Tb and the comparative water supply time Ta during complete blowing is set in advance, it is possible to clearly detect that a complete blowing operation has been performed.

When the complete blow detection signal S _B is output, in response to this, the counter 11a counts the cumulative number of complete blows, and displays the display tube 11c through the driver 11b.
to visually display the cumulative number of completed blows.

The display unit 11 may have a configuration in which the complete blow detection signal S _B is displayed as it is by lighting as information indicating the execution of a complete blow, or an output signal processing device and a type may be used instead of the display tube 11c etc. It is also possible to adopt a configuration in which a writer is attached and the date and time of the execution is printed in a tabular format each time a complete blow is executed, together with the cumulative number of times.

Furthermore, an arithmetic processing unit is attached to calculate the cumulative evaporation amount starting from the output point of the complete blow detection signal S _B , and automatically control the opening/closing of the blowing tank 1p, the opening/closing of the water supply command switches 8f, 8f', etc. You can also use it as

In the above embodiment, the surface of the canned water is detected by using the lower limit and the conductivity between the measurement water level probes 2a, 2b and the underwater electrode 2d, but the detection is not limited to this. It is sufficient to detect the boundary surface of the lower limit, the measurement water level probe 2a, 2
In place of configurations such as b, an optical water level sensor consisting of a light emitting element and a light receiving element arranged facing each other at the lower limit and the measurement setting position, and a magnetic sensor having a magnetic float placed at the lower limit and the measurement setting position may also be used. It is optional to employ lower limit, measuring water level sensors, including magnetic water level sensors and the like. Alternatively, a configuration may be adopted in which a water pressure signal proportional to the can water level is obtained from a single pressure sensor, and a comparator detects when this signal has reached the lower limit, a value corresponding to the measurement setting position.

Furthermore, the measurement water level sensor in the configuration of the present invention can also be used as a water level sensor for so-called interlock, which prevents the canned water from being heated when the canned water level drops below the lower limit water level. However, they may be provided separately.

As in the above configuration, the lower limit water level sensor and the measured water level sensor can be integrated with a single piece of hardware, so the lower limit water level sensor and the measured water level sensor referred to in this specification are not necessarily realized as separate and independent hardware. However, the present invention is not limited to this configuration.

In the above explanation, the comparison water supply time is measured as the water supply time from the start of water supply to the lower limit water level as the measurement setting position A, but the measurement of the comparison water supply time is not limited to this, for example, the measurement setting position B
The water supply time from to the measurement setting position A can be taken as the comparative water supply time.

To explain the relationship between this comparative water supply time and the initial water supply time in more detail, Fig. 5 takes the water level detection section shown in Fig. 2 as an example, and measures the water supply when water is supplied from an arbitrary water level L to the upper limit water level H. This figure shows various possible water supply times T ₁₀ to T ₁₅ . Here, the water supply time that can be used as the initial water supply time is T ₁₀ ,
T ₁₁ and ₁₂ .

Furthermore, the times that can be used only as comparative water supply times are T ₁₃ , T ₁₄ and T ₁₅ .

Furthermore, T ₁₀ , T ₁₁ and T ₁₂ can also be used as comparative water supply times.

That is, the initial water supply time is as in the above embodiment.
If T ₁₀ is selected, T ₁₁ , T ₁₂ , T ₁₃ , T ₁₄ and
Each filling time of T ₁₅ can be used as a comparison filling time, while if T ₁₁ is selected as the initial filling time, T ₁₀ , T ₁₂ , T ₁₃ , T ₁₄ and T ₁₅ can be used as a comparison filling time. and even if T ₁₂ is selected as the initial watering time.
T ₁₀ , T ₁₁ , T ₁₃ , T ₁₄ and T ₁₅ can be used as comparative water supply times.

In this way, the initial water supply time in the present invention is specified by the water supply time required for canned water to rise to an arbitrarily set water level after water supply starts, and is also defined as the comparative water supply time. is the water supply time in which the start or end time of the water supply time is specified by the canned water reaching the measurement setting water level set at a water level position other than the measurement setting water level set to measure the initial water supply time. It means.

In addition, as the point of time to start measuring the comparative water supply time, it is possible to select the time point at which the water supply starts when the canned water level cannot be specified as described above, or it is possible to specify a specific canned water level using the water level sensor. In some cases.

In the comparison and determination section of the present invention, it is possible to determine whether a predetermined plow has been executed based on the ratio between the initial water supply time Tb and the comparative water supply time Ta as described above. It can be determined that the predetermined blowing has been performed by subtracting the comparison water supply time Ta from the comparison water supply time Ta. When a blow is determined by this subtraction process, the time point at which water supply starts cannot be used as the starting point for the measurement section of the comparative water supply time Ta. That is, measurement of the comparative water supply time Ta when determining a blow by subtraction processing is limited to the water supply time between two preset measurement water levels. Of course, when the determination is made by division processing, all of the limits for the measurement interval of the comparative water supply time described in the explanation of FIG. 5 above can be adopted as the comparative water supply time. Considering that the water supply performance of a water pump generally deteriorates gradually, it is better to determine the blow state by division processing than by calculation processing. There is.

In the description of the embodiment shown in FIGS. 2 to 4, the determination of the complete blow state has been described, but the present invention is not limited to only determining the complete blow.
This makes it possible to determine that blowing to an arbitrary water level below the two measurement setting positions has been performed.

As described above, the present invention measures the initial water supply time and the comparative water supply time during the first water supply operation at the start of operation of the boiler, and determines whether or not a preset blow operation is being performed. and
The water level detection probe installed in conventional boiler systems can be used as is.

As described above, the present invention includes at least a blowing means for controlling the discharge (blow) of canned water in a boiler, and a water supplying means for supplying canned water to the boiler in response to a water supply command signal _S0 . In the boiler system,
Measurement water level sensors 2a and 2f that detect that the can water level in the boiler is at the measurement setting position A and output the measurement water level signal _S1 , and the can water level in the boiler being at the measurement setting position A. The measurement water level sensors 2b and 2g detect the presence of the water at the measurement setting position B, which is a different position, and output the measurement water level signal _S2 , and measure the time difference between the water supply command signal _S0 and the measurement water level signal _S2 . an initial water supply time measuring section, a comparative water supply time measuring section that measures a comparative water supply time Ta in which the start or end of the water supply time is specified when the canned water level reaches the measurement setting water level A, and the initial water supply. It is configured to include a comparison and determination section that determines a predetermined blow state based on the output signal S ₈ from the time measurement section and the output signal S ₇ from the comparison water supply time measurement section and outputs a blow signal S _B. Therefore, it is possible to automatically detect that a predetermined blow is being performed, and record and display the cumulative number of predetermined blows.
Automatic recording of historical data related to blowing operations becomes possible.

Furthermore, in the present invention, since the determination is made based on two water supply times, the initial water supply time and the comparative water supply time, it is possible to prevent misjudgment due to deterioration of the capacity of the water supply pump.

That is, by using the measurement water level sensors 2a and 2b that detect the two measurement setting positions of the can water level, the time required for the water level to reach each measurement water level sensor from the start of water supply is determined.
By taking Ta and Tb and calculating the ratio of Ta/Tb in the comparison/discrimination section, complete blowing can be accurately detected without being affected even if the water supply capacity of the water supply pump decreases. It is possible.

Therefore, according to the present invention, historical data regarding the number and timing of predetermined blows can be obtained without the troublesome task of recording each time a predetermined blow is performed in an operation logbook.
There is no loss of historical data due to negligence in recording work.
This has an excellent effect in that the timing of the blowing operation can be accurately determined forever, and damage to equipment caused by scale growth and carryover can be prevented.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the configuration of the boiler system, Figures 2 to 4 are related to embodiments of the invention, Figure 2 is a block diagram showing the configuration, and Figure 3 is a block diagram showing the configuration.
4 are waveform diagrams of essential parts, and FIG. 5 is a diagram showing the relationship between the initial water supply time and the comparative water supply time in the embodiment of the present invention. 2... Water level detection section, 2a... Lower limit water level probe,
2b...Measuring water level probe, 3...Water supply control unit,
4... Water supply pump, 8... Empty can state detection unit, 11
...Display section.

Claims (1)

[Scope of Claims] 1. A boiler system comprising a blowing means for controlling discharge (blow) of canned water in the boiler and a water supply means for supplying canned water to the boiler in response to a water supply command signal _S0 , comprising: Measurement water level sensors 2a and 2f detect that the can water level in the boiler is present at the measurement setting position A and output a measurement water level signal _S1 , and the can water level in the boiler is different from the measurement setting position A. It is equipped with measurement water level sensors 2b and 2g that detect the presence at measurement setting position B and output a measurement water level signal _S2 , and the time difference between the water supply command signal _S0 and the measurement water level signal _S2 . An initial water supply time measurement unit 8b that measures a certain initial water supply time Tb and a comparison that measures a comparative water supply time Ta in which the start or end of the water supply time is specified when the canned water level reaches the measurement setting water level A. A predetermined blow state is determined based on the water supply time measurement section 8a, the output signal _S8 from the initial water supply time measurement section 8b, and the output signal _S7 from the comparison water supply time measurement section 8a, and a blow signal S _B is output. A blow detection device for a boiler system, characterized in that an empty can state detection section 8 comprising a comparison and determination section 8c is provided.