JPS6326282B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a complete blow detection device for detecting the complete discharge of can water (hereinafter referred to as complete blow) in a boiler system, and particularly relates to a complete blow detection device for detecting the complete discharge of can water (hereinafter referred to as complete blow) in a boiler system. Based on the period of water level rise,
Complete blowing can be performed for partial drainage of water (below)
The present invention relates to a new complete blow detection device that detects a complete blow separately from an intermittent blow.

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 completely blown out and replaced with new canned water when the concentration of the canned water has progressed to a certain extent, and the number and timing of this is as follows:
For the operational management of the boiler system, it was necessary to record this information, especially as basic data for understanding the timing of the next blowing operation.

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.

In view of the problem of determining the timing of blowing work, etc. based on the above-mentioned conventional technology, it is an object of the present invention to detect a complete blow by detecting that the period of rise in the water level of the can during water supply work after blowing exceeds a specific value. A complete blow detection device in a boiler system that eliminates the above drawbacks by outputting a signal, automatically detects the execution of complete blow by distinguishing it from execution of intermittent blow, and enables automatic recording of historical data regarding blow work. We aim to provide the following.

The configuration of the present invention in accordance with the above-mentioned object is that a measuring water level sensor is disposed to form a water level detecting section, and when water supply work is performed immediately after blowing, water supply to the boiler is started in response to a water supply command signal, and canned water is The water level is rising,
When the measurement setting position is reached, the measurement water level sensor detects this and outputs a measurement water level signal, and the empty can status detection unit detects the water pipe below the measurement setting position based on the time difference between the water supply command signal and the measurement water level signal. The gist of this system is to measure the water supply time for the canned water accumulated in the tank, and when this time exceeds a certain period, the empty can status is detected and a complete blow detection signal is output. .

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 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. From the upper header 1d, a communication pipe 1l extends outside the wall 1a and communicates with the lower header 1c.

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 its output terminal is connected to an electric motor 4a 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 1d 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 it, 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 purging the air passage 1h with air, a high voltage is applied to the electrode rod 1j through the control signal line 6b, and at the same time, a high voltage is applied to the electrode rod 1j 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 between the upper and lower limit water levels preset.

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, use blowing stick 1.
By opening p, 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 generally an electric heater or the like is also used. Any heating device including 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 arranged such that its tip is located at the lower limit setting position L of canned water in intermittent water supply control, and a lower limit setting position L
The measuring water level probe 2b is arranged so that its tip is located at the measurement setting position B below (that is, below the upper limit setting position H described later), and the upper limit setting is above the lower limit setting position L of canned water. Upper limit water level probe 2c arranged so that its tip is located at position H
, the underwater electrode 2d buried in the can 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. Current detectors 2f, 2 inserted between each
g, 2h.

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 has a monostable multivibrator 8b whose input terminal is connected to a water supply command switch 8a as a water supply command signal means, and whose input terminal is connected to a positive phase output terminal of the monostable multivibrator 8b. Monostable multivibrator 8c
and a NAND gate 8d whose one input terminal is connected to the output terminal of the current detector 2g and the other input terminal is connected to the positive phase output terminal of the monostable multivibrator 8b, and whose input terminal is connected to the monostable multivibrator 8b. A monostable multivibrator 8e is connected to the positive phase output terminal of the monostable multivibrator 8c, and a flip-flop 8f whose set terminal is connected to the output terminal of the NAND gate 8d and whose reset terminal is connected to the complementary phase output terminal of the monostable multivibrator 8e.
and a NAND gate 8g, one input terminal of which is connected to the complementary output terminal of the flip-flop 8f, and the other input terminal connected to the positive phase output terminal of the monostable multivibrator 8c, and is linked to the water supply command switch 8a. A water supply command switch 8a' serving as means for forcibly stopping the water supply pump is inserted into the power supply line 4b of the electric motor 4a for driving the water supply pump 4.

The display unit 11 has an input terminal connected to the NAND gate 8.
a counter 11a as means for counting the number of complete blow executions connected to the output terminal of g;
A driver 11b and a display tube 11 successively follow a.
It consists of c.

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 Fig. 3Aa, if the can water level is higher than the lower limit setting position L, the lower limit water level probe 2a is submerged in the can water, and the distance between it and the submersible electrode 2d is lower than the can water level. A load circuit consisting of the current detector 2f, the lower limit water level probe 2a, and the submersible electrode 2d is formed for the AC power source 2e, so a current flows through the current detector 2f, which is detected to detect the current. The device 2f outputs "1" as shown in FIG. 3Cb.

Then, when the can water level falls and reaches the lower limit setting position L as shown in Figure 3 Ac, the tip of the lower limit water level probe 2a leaves the can water surface, and the load circuit to the AC power supply 2e is cut off. 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. 3 Cd.

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 as shown in FIG. 3 De. is reversed 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 electric motor 4a through the water supply command switch 8a', 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", the 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 2
c has been submerged in water, and since it was far from the water surface, the current detector 2h, which had been outputting "0" as shown in Figure 3 Bh, now outputs "1" as shown in Figure 3 Bi. will now be output.

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 the flip-flop 3b becomes "0", so
Relay 3e becomes de-energized, contact 3e' opens, and water supply stops.

In this way, the water supply period T ₁ from when the water supply pump starts to when it stops is specified even during the period when the flip-flop 3b is set to "1", and furthermore, from when the water supply pump stops to when it starts. The water supply stop period _T2 is the flip-flop 3b.
It is specified even during a period in which the value is "0".

Then, after the water supply is stopped, as shown in Figure 3 Ak, the can water level drops again at a rate of decline that corresponds to the amount of evaporation, and this, as shown in Figure 3 Al,
The flip-flop 3b remains at "0" until it reaches the lower limit setting position L, and then, as shown in FIG.
As shown in Dm, it is reversed to "1" and a water supply stop period _T2 is formed.

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.

Figure 4 shows change A in can water level and current detector 2.
The output signals of f and 2g, that is, the lower limit and measured water level signals B and C, the complementary output signal D of the flip-flop 8f, the positive phase output signal E of the monostable multivibrator 8b, and the output signal F of the NAND gate 8d.
FIG. 3 is a waveform chart showing a comparison between the output signal G of the NAND gate 8g and the positive phase output signal H of the monostable multivibrator 8c.

When performing blowing work, the operator
p is opened and the water supply command switches 8a and 8a' are opened, and the relay contact 3 in the water supply control section 3 is opened.
Regardless of the intermittent operation of e', by cutting off the power supply to the electric motor 4a, the water supply pump 4 is forcibly stopped in priority to the intermittent control by the water supply control unit 3.
Since the canned water in the water pipe 1b' is discharged at a large flow rate through the drain pipe 1n, the canned water level begins to fall rapidly, as shown in FIG. 4Aa.

Then, as shown in FIG. 4 Ab, when the lower limit setting position L is reached, the lower limit water level probe 2a leaves the water surface, so that the output signal of the current detector 2f changes from "1" to "1" as shown in FIG. 4 Bc. It is inverted to "0" and the lower limit water level signal _S1 is output.

During this period, the can water level was as shown in Figure 4 Ae.
Continuing the rapid decline, as shown in Figure 4 Af,
When the measurement setting position B is reached, the measurement water level probe 2b leaves the water surface, so the output signal of the current detector 2g becomes "1" as shown in FIG. 4Cg.
The measured water level signal S2 is inverted from 0 to 0, and the measured water level signal _S2 is output.

After performing complete blowing and performing inspection and maintenance inside the boiler as necessary, the operator closes the blower stock 1p and then closes the water supply command switch 8a' to forcibly turn on the water supply pump 4. When the stop is released, the power supply to the electric motor 4a for driving the water supply pump 4 comes to be controlled by the opening and closing of the relay contact 3e', and the intermittent control operation of water supply 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 L, 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 8a is closed in conjunction with the closing of the water supply command switch 8a', and by grounding the input terminal of the monostable multivibrator 8b, a water supply command signal _S0 is given to the multivibrator. Therefore, as shown in Figure 4 Ej,
The monostable multivibrator 8b is triggered and shifts to a metastable state.

On the other hand, when water supply starts, the canned water level will change as shown in Figure 4.
As shown in Ak, it rises at a slow rate according to the water supply flow rate, but especially in the early stage of water supply, the water pipe 1
Since the lower pipe header 1c, which has a wide cross-sectional area and is equivalently expressed as the extended portion 1c' of b', is filled with canned water, the rising speed is extremely slow, and it takes a long time for the canned water level to rise. It is necessary.

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 rises at a relatively fast rate, as shown in Figure 4 Al. .

Then, the can water level is as shown in Figure 4 Am.
When reaching the measurement setting position B, the output signal of the current detector 2g is inverted from "0" to "1" and outputs the measured water level signal _S2 , as shown in FIG. 4Cn.

However, in the case of water supply after complete blowing, it takes a long time to fill the lower header _1c . The monostable multivibrator 8b, which had transitioned to a stable state,
It will return to a stable state as shown in Figure Ep.

Therefore, since "1" is not simultaneously supplied to the two input terminals of the NAND gate 8d, FIG.
As shown in , the gate 8d continuously outputs "1".

Therefore, there is no change in the voltage at the set terminal of flip-flop 8f, and the positive phase output signal of flip-flop 8f remains at "0" as shown in FIG. 4D.

Thus, the complementary output terminal of the flip-flop 8f continues to supply "1" as the empty can state detection signal _S4 to one input terminal of the NAND gate 8g.

When the monostable multivibrator 8b returns to a stable state, the subsequent monostable multivibrator 8c is triggered and shifts to a quasi-stable state, and "1" is supplied to the other input terminal of the NAND gate 8g. .

At this time, as described above, if the empty can state is detected and the empty can state detection signal _S4 is continuously output from the flip-flop 8f, "1" is output to both input terminals of the NAND gate 8g. Therefore, the output signal of NAND gate 8g is as shown in Figure 4.
As shown in Gq, invert from "1" to "0",
A complete blow detection signal _S5 is output.

Subsequently, when the monostable multivibrator 8c returns to a stable state as shown at Hz in FIG.
As shown in FIG. When the reset terminal receives the inversion from "1" to "0", the flip-flop 8f is reset to "0".

Now, suppose that due to artificial intermittent blowing or some other reason, complete blowing is not achieved and the canned water level is not zero, as shown in Figure 4 At, that is, the canned water remains. Assuming that water supply has started, as shown in Figure 4 Ak', the canned water level will rise while missing part or all of the period required to fill the lower header 1c, so the measurement settings The time required to rise to position B is shortened.

Then, as shown in Fig. 4 Am', the can water level reaches the measurement setting position B, and as shown in Fig. 4 Cn', the output signal of the current detector 2g changes from "0" to " At the time of inversion to "1", the monostable multivibrator 8b is still in a metastable state as shown in FIG. 4 Eu, so one input terminal of the NAND gate 8d receives "1" from the current detector 2g. However, "1" from the monostable multivibrator 8b is supplied to the other input terminal, and as shown in FIG. 4 Fv, the NAND gate 8
The output signal of d is inverted from "1" to "0". Upon receiving this inverted signal at the set terminal, the flip-flop 8f is set to "1" as shown in FIG. 4 Dw, its complementary output becomes "0", and the empty can state detection signal _S4 disappears.

Therefore, in such a case, Fig. 4 Ep
As shown in , even if the monostable multivibrator 8b eventually returns to a stable state and the subsequent monostable multivibrator 8c shifts to a metastable state, the flip-flop 8f supplied to one input terminal of the NAND gate 8g The complementary output signal of is “0”
Therefore, the output signal of the NAND gate 8g remains at "1" as shown in FIG. 4 Gx, and the complete blow detection signal _S5 is not output.

When the monostable multivibrator 8b returns to a stable state, the output signal of the NAND gate 8d returns to "1" again, as shown in FIG. 4Fy.

Subsequently, the fourth monostable multivibrator 8c
As shown in the figure Hz, when the stable state is restored, the monostable multivibrator 8e is triggered and shifts to the quasi-stable state as described above, and its complementary output signal is inverted from "1" to "0". is received at the reset terminal, and the flip-flop 8f is reset to "0" as shown in FIG. 4Ds.

In this way, the empty can state detection unit 8 determines whether the can water level rises to the measurement setting position B within a specific period preset as the metastable time of the monostable multivibrator 8b. When supplying water after a complete blow, be sure to time the elapsed water supply time required to fill the lower header 1c with canned water to distinguish and detect a complete blow from an intermittent blow. detection signal
It outputs _S5 .

Regarding the distinction between such complete blowing and intermittent blowing, etc., only complete blowing completely wipes out the residue from can water concentration inside the can, and supplying water after complete blowing brings the can water concentration to its initial level. In view of the fact that it is convenient for boiler operation management to count the number of times only complete blowing is performed, since the boiler is recovered to the value and, in many cases, maintenance and inspection of the inside of the can is performed immediately after complete blowing. It is meaningful.

When the complete blow detection signal _S5 is output, in response to this, the counter 11a counts the number of times the complete blow has been executed, and displays the display tube 11c through the driver 11b.
to visually display the cumulative number of complete blows.

The display section 11 may have a structure in which the complete blow detection signal _S5 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 _S5 , and automatically control opening/closing of the blowing tank 1p, opening/closing of the water supply command switches 8a, 8a', etc. You can also use it as

In the above embodiment, the surface of can water is detected using the lower limit and the conductivity between the measurement water level probes 2a, 2b and the underwater electrode 2d, but this 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 opposite 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, it is also possible to provide these separately and independently.

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.

As described above, according to the present invention, the water supply control means 3 that controls the water supply pump 4 intermittently in response to the upper and lower limit water level signals from the water level detection means 2 that detects the upper and lower limits of the can water level; In a boiler system equipped with a blow tank 1p for water excretion, the water supply control means 3
In order to give priority to the intermittent control in , the water supply pump forced stop means 8a' forcibly stops the water supply pump 4 in advance, and in conjunction with the release from this stop, the water supply command signal means 8a outputs the water supply command signal S. ₀ is output, and the measurement water level sensors 2b and 2g detect that the can water level reaches the measurement setting position B after the stop of the water supply pump 4 is released, and output the measurement water level signal _S2 , and the water supply command signal _S0 . By detecting that the time difference with the measured water level signal _S2 is equal to or greater than a predetermined value, the empty can state detection means 8 outputs the complete blow detection signal _S5 , so that the complete blow is automatically executed. Moreover, since it can distinguish it from intermittent blowing, etc. and automatically record it, it effectively prevents the loss of historical data related to blowing operations, and further reduces the chance of equipment damage due to scale growth or carryover. The excellent effect of significantly reducing the amount of water is achieved.

[Brief explanation of the drawing]

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 main parts. 2... Water level detection unit, 2a... Lower limit water level probe, 2b... Measurement water level probe, 3... Water supply control unit, 4... Water supply pump, 8... Empty can state detection unit,
11...Display section.

Claims (1)

[Claims] 1. Lower limit water level sensors 2a and 2f that detect that the can water level is below the lower limit setting position L and output a lower limit water level signal _S1 , and when the can water level is above the upper limit setting position H. Water level detection means 2 consisting of upper limit water level sensors 2c and 2h that detect this and output an upper limit water level signal, and a water supply pump 4 that supplies canned water to the water pipe in response to the lower limit water level signal _S1 are started, and the upper limit water level signal is output. In a boiler system equipped with an intermittent control water supply control means 3 that stops the water supply pump 4 in response to a water level signal, and a blow tank 1p that controls the discharge (blow) of boiler can water, the can water level in the water pipe 1b is , rising from below,
Measurement water level sensors 2b and 2g detect that the measurement setting position B below the upper limit setting position H has been reached and output a measurement water level signal _S2 , and the water supply is started with priority over the intermittent control by the water supply control means 3. A water pump forced stop means 8a' for forcibly stopping the pump 4; and a water pump forced stop means 8a' for forcibly stopping the water pump 4.
Water supply command signal means 8a that outputs a water supply command signal _S0 at the time of release from the forced stop.
Detecting that the time difference between the water supply command signal S ₀ after blowing and the measured water level signal S ₂ is longer than a specific period that is greater than the time difference between the two signals S ₀ and S ₂ in the case of intermittent blowing, and A boiler system comprising an empty can state detection means 8 that outputs a blow detection signal _S5 , and a complete blow execution count means 11a that counts the number of complete blow executions in response to the complete blow detection signal _S5 . Complete blow detection device.