JPH0210323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a can water concentration measuring device for continuously and automatically measuring the increasing tendency of impurity concentration in can water due to the concentration of can water in a boiler system, and in particular, The present invention relates to a can water concentration measurement device that measures the degree of concentration of can water based on the phenomenon that the period during which water is supplied to a boiler increases as the can water becomes more concentrated under intermittent control.

Generally, when a boiler system is operated for a long period of time, the canned water becomes concentrated, so that the concentration of impurities such as dissolved solids contained in the canned water increases, causing bubbles to form on the surface of the canned water. It is known that such bubbles leave the air-water interface and get mixed into the steam, causing carryover, which causes damage to related equipment such as valves connected to the boiler system.

In order to prevent carryover, the concentration of canned water can be estimated by measuring the flow rate of water supply or steam using a flow meter, and when this concentration increases to a certain extent, the canned water can be blown out (hereinafter referred to as blowout). However, in small boiler systems, the economical burden of equipping a flow meter is relatively large, so its adoption is not common. Therefore, instead of measuring with a flowmeter, it is possible to measure the cumulative fuel consumption of the boiler system in units of storage containers, typically drums, or to The concentration of canned water is often estimated by extracting a portion of the water and measuring its electrical conductivity.

However, when estimating the cumulative steam consumption based on the cumulative fuel consumption and further estimating the can water concentration based on the cumulative steam consumption, the efficiency of the boiler system depends on the steam consumption (load). Therefore, it was difficult to expect highly accurate measurements.

In addition, when measuring based on counts of storage containers such as drums, the minimum unit of measurement is extremely large, and measurement involves a large amount of quantization error, so it is far from being a continuous quantity measurement.

Furthermore, measuring cumulative fuel consumption using drums, etc. is often not carried out because it involves the complicated work of counting and recording the number of drums, etc. in which consumed fuel was stored. In many cases, it became impossible to grasp the cumulative amount of evaporation and even the concentration of canned water.

Furthermore, when estimating the concentration of canned water based on the electrical conductivity of canned water, only intermittent measurements can be made;
Moreover, since the measuring circuit is actually limited, it has not been possible to continuously measure the increasing tendency of the concentration of canned water.

Therefore, with such conventional boiler systems, it is not possible to accurately determine when to perform blowing.
The disadvantages are that the canned water becomes extremely concentrated, causing frequent carry-overs, and there is an extremely high risk of damage to related equipment.

In view of the problem of estimating the concentration of canned water based on the above-mentioned prior art, the purpose of this invention is to
By measuring the increasing tendency of the water supply period based on the phenomenon that increases as the concentration of canned water progresses, the above drawbacks are eliminated and the concentration of canned water is measured continuously with high accuracy. The purpose of the present invention is to provide an excellent device for measuring the concentration of can water in a boiler system.

In accordance with the above object, the present invention has a structure in which upper and lower water limit water level sensors are disposed in a communication pipe that communicates the upper and lower ends of the water pipe to form a water level detection section, and the water level detector responds to output signals from each of the upper and lower water limit water level sensors. A water supply control unit is provided to start or stop a water supply pump that supplies canned water to the water pipe, and when the water level in the communication pipe falls in response to the drop in the canned water level due to steam consumption and reaches the lower limit water level, The lower limit water level sensor detects this and sends a lower limit water level signal to the water supply control unit to start the water supply pump, and as the canned water level rises with the start of water supply, the water level in the communication pipe rises and reaches the upper limit water level. In a boiler system equipped with an intermittent control water supply control system in which the upper limit water level sensor detects this and sends an upper limit water level signal to the water supply control unit to stop the water supply pump, a water supply period measuring unit is attached. hand,
The water supply period from when the water supply pump starts to when it stops is measured, and a canned water concentration calculating section is added to calculate the standard in a state where there is no concentration of canned water from the water supply period measured by the water supply period measurement section. By subtracting the water supply period, we calculate the increasing tendency of the water supply period due to the phenomenon that the fluctuation range of the water level drop in the communication pipe at the start of water supply increases as the concentration of canned water progresses, and the calculation result is This is characterized in that it is output as a water concentration signal.

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 circumferential surface of a wall 1a, and the water pipes 1b are made of a hollow cylindrical body, and the lower end thereof is an annular lower header 1c (water chamber). The upper end portions thereof communicate with the annular upper header 1d (steam chamber), and the lower portions of the lower header 1c and the water pipe 1b,
Canned water is stored.

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 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 the introduction pipes of the electric motor 1f, the electrode rod 1j, and the fuel pump 6d communicate with a fuel tank (not shown),
Its discharge pipe communicates with the nozzle rod 1i. and,
A blow pipe 1n extends from the lower header 1c and communicates with a drainage channel (not shown) via a blow 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 send air into the air passage 1h, and applies 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 becomes 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 steam pressure in the upper header 1d drops due to continued consumption of steam and a lower limit steam pressure signal is received, the combustion control section 6 starts the electric motor 1f through the control signal line 6a and starts the blower 1g. Wind path 1h
After purging with air, a high voltage is applied to the electrode rod 1j through the control signal line 6b, and at the same time, the fuel pump 6d is started through the control signal line 6c to ignite the fuel injected from the nozzle rod 1i and start combustion. Furthermore, when steam generation continues and the steam pressure increases and an upper limit steam pressure signal is received from the pressure detection section 5, the fuel pump 6
d to stop combustion by cutting off the fuel supply, and after waiting for the combustion gas to be discharged, the electric motor 1f is stopped via the control signal line 6a and the air blowing from the blower 1g is cut off.

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 the water supply system, 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 extracted configurations of the water level detection section 2 and water supply control section 3 in FIG. 1.

In comparison with the configuration shown in Fig. 1, the conduits 1l' and 1l'' are connected to the upper header 1d and the lower header 1c, respectively, and a portion of the canned water in the water pipe 1b is connected to the communicating pipe 1l. are extracted and derived.

The water level detection unit 2 includes a lower limit water level probe 2a that detects that the water level of the communication pipe 1l has reached the lower limit water level L.
and an upper limit water level probe 2b that detects when the water level of the communication pipe 1l has reached the upper limit water level H are arranged so that their tips are located at the lower limit water level L and the upper limit water level H, respectively, and are buried in water. Underwater electrode 2c
and an AC power source 2 whose one end is connected to the underwater electrode 2c.
d, the other end of the AC power supply 2d, and the lower limit water level probe 2
a first current detector 2e inserted between the
It includes a second current detector 2f inserted between the AC power source 2d and the upper limit water level probe 2b.

Here, the upper limit water level H and the lower limit water level L are water levels preset in the communication pipe 1l of the water level detection unit 2 as the upper and lower limit water levels of canned water in the intermittent control of water supply.

Further, ΔL is a fluctuation width of the lower limit water level L in the communication pipe 1l at the start of water supply.

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

Figure 3 compares the water level change A in the communication pipe 1l in the water level detector 2, the output signals C and B of the first and second current detectors 2e and 2f, and the positive phase output signal D of the flip-flop 3b. FIG.

Water level detection unit 2 and water supply control unit 3 configured as above
Regarding this, first, the operation of water supply control in a state where canned water is not concentrated, typically, immediately after water supply after blowing, will be described as follows.

Now, as shown in Figure 3 Aa, if the water level of the communication pipe 1l is higher than the lower limit water level L,
The lower limit water level probe 2a is submerged, and the underwater electrode 2c
A state of conduction is established between the AC power source 2 through water, and the
Since a load circuit consisting of a first current detector 2e, a lower limit water level probe 2a, and an underwater electrode 2c is formed for d, a current flows through the first current detector 2e, which is detected and the first The current detector 2e is the third
Outputs "1" as shown in Figure Cb.

Then, when the water level falls and reaches the lower limit water level L as shown in Figure 3 Ac, the tip of the lower limit water level probe 2a leaves the water surface and the load circuit to the AC power source 2d is cut off. The current passing through the current detector 2e becomes zero, and upon detecting this, the first current detector 2e outputs "0" as shown in FIG. 3 Cd. In response to the inversion of the output signal of the first current detector 2e from "1" to "0" at the set terminal, the flip-flop 3b is set to "1", and its positive phase output terminal has the signal shown in FIG. As shown in De, an inverted signal from "0" to "1" appears. Upon receiving this signal, driver 3
c becomes conductive, relay 3e is energized,
Since the contact 3e' is closed and power is supplied to the electric motor 4a, water is supplied by the water supply pump 4.

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

Eventually, as shown in Figure 3Ag, when the water level reaches the upper limit water level H, the upper limit water level probe 2
b was not submerged in water, the second current detector 2f, which had been outputting "0" as shown in Figure 3 Bh, now outputs "1" as shown in Figure 3 Bi. become. The inversion of the output signal of the second current detector 2f from "0" to "1" is converted by the inverter 3a into an inversion from "1" to "0" and is supplied to the reset terminal of the flip-flop 3b. , reset this to "0".

Then, as shown in FIG. 3Dj, the positive phase output of the flip-flop 3b becomes "0", so the relay 3e is de-energized, the contact 3e' is opened, and the water supply is stopped.

In this way, the period T ₁ from when the water supply pump 4 starts until it stops (hereinafter referred to as water supply period) is specified even during the period when the flip-flop 3b is set to "1".

In such intermittent control of the water supply pump, the amount of water accumulated in the water pipe 1b during one water supply period is specified to a value unique to each boiler system based on the difference W between the lower limit water level L and the upper limit water level H. be.

After stopping the water supply, as shown in Figure 3 Ak,
The water level falls again and reaches the lower limit water level L, and the same operation is repeated to maintain the water level between the lower limit water level L and the upper limit water level H.

Next, the water supply control operation in a state where the concentration of canned water has progressed will be explained as follows.

In a state where the concentration of canned water has progressed, the canned water foams violently in the water pipe 1b under high temperature due to changes in the physical properties of the canned water. The water level is pushed up and becomes higher than the can water level in the water pipe 1b, and when water supply starts, the temperature of the can water decreases and foaming is suppressed, so the above reaction also disappears,
A phenomenon is observed in which the water level in the communication pipe 1l becomes equal to the canned water level in the water pipe 1b.

Therefore, as shown in Fig. 3 Ac, the communication pipe 1l
When the water level reaches the lower limit water level L, water supply to the water pipe 1b is started according to the above operation, the temperature of the canned water in the water pipe 1b decreases, the bubbling of the canned water becomes calm, and the reaction caused by the bubbling is reduced. disappears, the water level in the communication pipe 1l drops rapidly, as shown in Fig. 3 Ac', and becomes equal to the can water level in the water pipe 1b after the bubbling disappears.

That is, at the time when the water level in the communication pipe 1l pushed up by the reaction of the bubbling of the canned water reaches the lower limit water level, the water level of the canned water excluding the bubble layer of the bubbling canned water in the water pipe 1b is △ lower than the lower limit water level L. When the bubble layer disappears with the start of water supply, the water level in the communicating pipe 1l decreases by the water level change range ΔL toward the water surface of the can.

Then, when the supply of canned water continues, water pipe 1b
Corresponding to the rise in the water level in the can, the can water in the 1 liter communication pipe also rises as shown in Fig. 3 Af'.
At the time indicated by Ag', the upper limit water level sensor H is reached and the water supply is stopped.

At this time, even if the water level raising process starts at the same time, the water level lowering fluctuation range will change as shown in Figure 3 Ac' in the water level raising process in a state where the canned water is concentrated as shown in Figure 3 Af'. Since the starting point is ΔL downward, the time point at which the upper limit water level H is reached is delayed by ΔT ₁ , as shown in FIG. 3Ag and g'.

Therefore, the time when the output signal of the upper limit water level probe 2b is reversed from "0" to "1" is also delayed by _ΔT1 , as shown in FIG. 3 Bi', and eventually the time when the flip-flop 3b is reset is reached. As shown in Figure 3 Dj', there is a delay of △T ₁ , so the water supply period T ₁
increases by △T ₁ .

Additionally, even if canned water is concentrated,
Water supply continues, and by the time the water level in the communication pipe 1L reaches the upper limit water level H, the bubbling has disappeared due to the temperature drop, and the water level in the communication pipe 1L has become equal to the can water level.
In the end, the amount of canned water held in the water pipe 1b when the water supply is stopped is equal to that when the canned water is not concentrated, so as the water supply period increases, the amount of water supplied even with one intermittent control will decrease. It will increase.

This tendency to increase the water supply period depends on the fluctuation width ΔL of the decrease in the water level in the communicating pipe 1l due to bubbling of canned water in the water pipe 1b immediately before the start of water supply, but in general, it is due to the concentration of canned water. As the progress progresses,
Since foaming tends to intensify just before the start of water supply, as the canned water becomes more concentrated, the water level drop fluctuation range ΔL increases, and thus the water supply period _T1 also increases.

Therefore, since the increasing tendency of the water supply period represents the degree of concentration of the canned water, by measuring this, the degree of concentration of the canned water can be estimated.

Furthermore, in a state where the canned water is concentrated, when the water level in the communication pipe 1l reaches the upper limit water level H and the water supply is stopped, as shown in Fig. 3Ag', the canned water will evaporate. Accordingly, the water level of 1 liter of communication pipe is as shown in Figure 3.
As shown in Ak', it descends along a curved line with a curved part.

This curved portion is caused by the fact that the canned water, which had lost its foaming during the water supply period, begins to foam again when the water supply is stopped, and the water level of the communication pipe 1l is pushed up relative to the canned water level. It is something.

In addition, in the above embodiment, the upper and lower limit water level probe 2
Although the water level is detected using the conductivity between b2a and the underwater electrode 2c, the present invention is not limited to this. Instead of the upper and lower limit water level probes 2b2a, etc., a light emitting element and a light receiving element may be installed at the upper and lower limit positions. It is optional to adopt an upper and lower limit water level sensor including an optical water level sensor in which elements are arranged facing each other, a magnetic water level sensor in which a magnetic float is detected by a magnetic sensor placed at the upper and lower limit positions, etc. be.

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 reaches the upper and lower limit set values. As in the above configuration, it is possible to realize the upper and lower limit water level sensors in one piece using only one piece of hardware, so the lower limit water level sensor and upper limit water level sensor referred to in this specification are not necessarily realized as separate and independent hardware. It is not limited to the configuration.

FIG. 4 is a block diagram showing the configuration of the water supply period measurement section and the canned water concentration calculation section. In the same figure,
The water supply period measuring section 7 includes a clock pulse oscillator 7a.
and one input terminal is the clock pulse oscillator 7a.
and an AND gate 7b whose other input terminal is connected to the water supply control section 3 (the positive phase output terminal of the flip-flop 3b), and the output terminal of the AND gate 7b is connected to its input terminal. It consists of a counter 7c and a monostable multivibrator 7d whose input terminal is connected to the positive phase output terminal of the flip-flop 3b and whose output terminal is connected to the clear terminal of the counter 7.

The canned water concentration calculation unit 8 includes a calculation unit 8a whose one input terminal is connected to the output terminal of the counter 7c and whose control terminal is connected to the positive phase output terminal of the flip-flop 3b, and whose output terminal is connected to the calculation unit 8a. Reference water supply period setting device 8b connected to the other input terminal of
It consists of 9 is a display unit connected to the calculation unit 8a.

The operations of the water supply period measurement section 7 and the canned water concentration calculation section 8 having the above configuration will be explained as follows.

When a signal is received from the positive phase output terminal of the flip-flop 3b of the water supply control unit 3 and becomes "1" as shown in FIG. 3 De, the flip-flop 3
Only during the period when b is "1", that is, during the water supply period, the AND gate 7b is opened and the clock pulse from the clock pulse oscillator 7a is sent to the counter 7.
c and have them counted.

Then, as shown in FIG. 3Dj', when the flip-flop 3b is inverted from "1" to "0", the AND gate 7b is closed and the supply of clock pulses to the counter 7c is cut off, and the counter 7c has the following values:
According to the example shown in FIG. 3D, which increases the water supply period according to the concentration of canned water, a digital code representing the water supply period (T ₁ +△T ₁ ) is generated, and the counter 7
c outputs this as the water supply period signal _S1 . At this time, at the same time, flip-flop 3b's "1"
When the control terminal receives the inversion from 0 to 0, the arithmetic unit 8
a executes arithmetic processing to be described later.

After the arithmetic processing by the arithmetic unit 8a is completed, the monostable multivibrator 7d is triggered and transitioned to a metastable state when the flip-flop 3b is inverted from "1" to "0".
returns to a stable state and sends a clear pulse to the clear terminal of the counter 7c, so the counter 7c is cleared and ready for the next measurement.

During this time, that is, before the counter 7c is cleared, the calculator 8a calculates the canned water concentration preset in the reference water supply period setting device 8b, which is made of a digital switch, etc., from the water supply period signal _S1 outputted by the counter 7c. Standard water supply period signal S ₂ representing the water supply period in the absence of (hereinafter referred to as standard water supply period)
, and the subtraction result, that is, Fig. 3D
According to the example shown in , a can water concentration signal S ₃ representing an increment ΔT ₁ of the water supply period (T ₁ +ΔT ₁ ) with respect to the reference water supply period T ₁ is output.

The canned water concentration signal _S3 obtained in this way is
Since it tends to increase as the concentration of canned water progresses, the degree of concentration of canned water can be estimated based on this signal.

The display unit 9 receives a can water concentration signal _S3 from the calculator 8a.
Then, this is converted directly or according to an experimental formula into a numerical value representing the actual concentration of canned water, and the numerical value is visually displayed on a digital display tube.

A second configuration of the invention that is related to the present invention is that, in addition to the water level detection unit 2 and the water supply control unit 3 in the configuration of the present invention, a water supply frequency measuring unit is attached to measure the number of water supply during a specific period. Furthermore, a canned water concentration calculating section is attached, and the number of times of watering measured by the number of times of watering is measured by the number of times of watering is subtracted from the standard number of times of watering in a state where there is no concentration of canned water, which is set in advance, to determine the standard number of times of watering. By calculating the decrement for the number of times,
The present invention is characterized in that a decreasing trend in the number of water supplies during a specific period is calculated, and the result of the calculation is output as a canned water concentration signal.

Based on FIG. 5, the structure and operation of the embodiment of the second invention related to the present invention will be explained as follows.

FIG. 5 is a book diagram extracting the configuration of the water supply frequency measuring section and the canned water concentration calculation section in an embodiment of the second invention related to the present invention.

Note that the other components are the same as those shown in FIG.

In FIG. 5, the water supply frequency measuring unit 10 is connected to a counter 1 whose input terminal is connected to the water supply control unit 3.
0a and latch 10 connected to counter 10a.
b, a timer 10c whose output terminal is connected to the clock terminal of latch 10b, and a monostable multivibrator whose input terminal is connected to the output terminal of timer 10c and whose output terminal is connected to the clear terminal of counter 10a. 10d.

The canned water concentration calculating section 11 has one input terminal connected to the latch 10b, and a timer 1 connected to the control terminal.
It consists of an arithmetic unit 11a connected to an output terminal of 0c, and a reference water supply frequency setting device 11b connected to another input terminal of the arithmetic unit 11a. 12 is a display section connected to the computing unit 11a.

In the above configuration, the counter 10 receives a signal that becomes "1" during the water supply period from the positive phase output terminal of the flip-flop 3b included in the water supply control section 3.
a is the number of times the signal flips from “1” to “0”;
That is, the number of times the water supply is stopped is counted. Meanwhile, the timer 10c continues to operate over time, and when it detects the elapse of a preset specific period, it sends an output signal to the clock terminal of the latch 10, and displays the contents of the counter 10a at that time, i.e., the contents of the counter 10a during the specific period. A digital code representing the number of water supply stops is temporarily stored in the latch 10b.

The monostable multivibrator 10d, which has been triggered at this point and has entered the metastable state, immediately clears the counter 10a after waiting for the storage by the latch 10b to be completed.

Thus, after the counter 10a counts the number of water supply stops in a specific period, it can immediately wait in a state where it can count the number of water supply stops in the next specific period.

In the above embodiment, the counter 10a counts the number of water supply stops, but if the complementary output terminal of the flip-flop 3b included in the water supply control unit 3 is connected to the input terminal of the counter 10a,
The counter 10a can also count the number of times water supply is stopped.

Since the number of occurrences of both during a specific period is generally the same, it is optional whether to measure the number of water supply stops or the number of water supply starts as the number of water supply times.

Now, during this time, the arithmetic unit 11a responds to the output signal from the timer 10c at the time of completion of the elapsed operation, and
The water supply frequency signal S 1 ' output by the latch 10b is subtracted from the reference water supply frequency signal S ₂ ' output by the reference water supply frequency setting device _11b , that is, the signal representing the water supply frequency corresponding to the reference water supply period. , outputs a can water concentration signal S ₃ ' representing the result of the subtraction, that is, the decrement of the number of times of water supply during the specific period from the reference number of times of water supply.

Since the canned water concentration signal S ₃ ′ obtained in this way decreases as the concentration of canned water progresses, it is possible to estimate the canned water concentration based on this signal. be.

The display unit 12 receives the canned water concentration signal S ₃ ' from the calculator 11a, and displays it directly or by converting it into a numerical value representing the actual canned water concentration according to an experimental formula. Even pipes, etc. should be clearly marked.

In the above embodiments of this invention and the second invention linked to this invention, the water supply period measuring section 3 and the water supply frequency measuring section 10 measure the water supply period for one water supply and the water supply period for one specific period. The number of times is measured, and one water supply period signal S ₁ and one water supply frequency signal S ₁ ' are output, respectively, and based on these,
The canned water concentration calculation units 8 and 11 calculate one canned water concentration signal S ₃ S ₃ ', but they measure the water supply period for multiple water supplies and calculate the average value of these. It is also possible to process this as one water supply period signal, or to measure the number of water supplies for a plurality of specific periods, calculate the average value thereof, and process this as one water supply frequency signal. By doing so, it is possible to avoid variations in the water supply period signal and water supply frequency signal caused by instantaneous fluctuations in the boiler system, and there is a practical benefit in that more stable and accurate judgment can be obtained.

Further, in the above embodiment of this invention and the second invention linked to this invention, the reference water supply period setting device 8
b. A reference water supply frequency setting device 11b is provided, and the reference water supply period and reference water supply frequency are set in advance by manual operation. However, the setting is not limited to manual operation; Immediately after water supply, the water supply period signal and water supply frequency signal obtained by the water supply period measuring section 7 and the water supply frequency measuring section 10 are transferred to the reference water supply period setting device 8b and the reference water supply frequency setting device 11b and stored therein. A configuration may be adopted in which the standard water supply period and the standard water supply frequency can be automatically set.

This has the practical benefit of being able to accurately set the standard water supply period and standard water supply frequency specific to the boiler system with a simple operation.

In particular, in the configuration of this invention and the second invention linked to this invention, the reference water supply period and the reference water supply frequency change depending on the steam load, so the reference value for each steam load can be automatically set. The actual benefits are huge.

As described above, the present invention is equipped with a water level detection unit and a water supply control unit to which canned water is guided through a communication pipe, and starts the water supply pump when the water level in the communication pipe reaches the lower limit water level, and controls the water level in the communication pipe. In a boiler system in which the water supply pump is stopped when the water level reaches the upper limit water level, a water supply period measurement section and a canned water concentration calculation section are attached to measure the water supply period and calculate the difference between this and the standard water supply period. By calculating the difference, it was found that under high temperatures just before the start of water supply, air bubbles are generated in the water pipe at a rate corresponding to the progress of concentration of canned water, and the water level in the communication pipe is pushed up by the reaction, causing water supply to start. At this time, the air bubbles in the water pipe disappear and the water level in the communicating pipe decreases by the amount of the water level drop fluctuation range that corresponds to the progress of concentration of canned water, and becomes equal to the canned water level in the water pipe, and the water supply period ends. Inside, the water level in the communication pipe is kept specifically at the canned water level, so as canned water becomes more concentrated, the difference between the canned water level when water supply starts and the canned water level when water supply stops increases. It is configured to output an increasing tendency of the water supply period due to the increase as a canned water concentration signal.

Further, a second invention related to the present invention is that, in addition to the water level detection section and the water supply control section of the present invention, a water supply frequency measuring section and a canned water concentration calculating section are attached, and the number of water supply times during a specific period is determined. By counting the number of times and detecting the difference between this and the reference number of times of water supply, the system is configured to output a decreasing tendency of the number of times of water supply during a specific period as a canned water concentration signal.

Therefore, according to this invention and the second invention linked to this invention, it is possible to directly determine the strong correlation between the increasing tendency of the water supply period, the decreasing tendency of the number of water supply during a specific period, and the concentration of canned water. Compared to the conventional method of measuring cumulative fuel consumption in units of storage containers such as drums, this method has the effect of being able to measure canned water concentration with high accuracy and accurately determining the timing of blowing. .

Furthermore, since calculation processing is performed based on information obtained even from relatively short-term measurements such as the water supply period and the number of water supplies during a specific period, it has the effect of being able to virtually continuously measure the concentration of canned water. .

In addition, since canned water concentration signals can be obtained automatically, the complicated work of counting and recording storage containers such as drums is no longer necessary, and there is no need to neglect counting and recording. There is also the effect that the risk of losing the blow-drying time is extremely reduced.

Moreover, the water level detection section and the water supply control section in the configuration of this invention and the second invention linked to this invention are essential components for the intermittent control of the water supply, and these can be used as they are to control the water supply. It is sufficient to add a component to process the water pump start/stop signal obtained from the section.
It has the advantage of having a simple configuration, no waste, and can be realized at low cost.

[Brief explanation of drawings]

Figure 1A is a block diagram showing the configuration of a small boiler system to which the configuration of the present invention can be attached.
Figure B is an AA sectional view of the boiler 1 in Figure 1A, Figures 2 to 4 relate to embodiments of the present invention, and Figure 2 shows the configuration of the water level detection section and water supply control section. 3 is a waveform diagram of the main parts in the configuration of FIG. 2, FIG. 4 is a block diagram showing the configuration of the water supply period measurement section and the canned water concentration calculation section, and FIG.
The figure is a block diagram showing the configuration of an embodiment of the second invention related to this invention. 1...Boiler, 2...Water level detection section, 3...Water supply control section, 4...Water supply pump, 7...Water supply period measurement section, 8...Evaporation amount calculation section, 9, 12...Display section,
10...Water supply frequency measuring unit, 11...Canned water concentration measuring unit.

Claims (1)

[Claims] 1. A communication pipe that connects the upper and lower ends of the water pipe to extract a portion of the canned water, and a lower limit water level that outputs a lower limit water level signal when detecting that the water level of the communicating pipe is at the lower limit water level. Water level detection means consisting of a sensor, an upper limit water level sensor that detects that the water level of the communication pipe is at the upper limit water level and outputs an upper limit water level signal, and a water supply pump that supplies pipe water to the water pipe in response to the lower limit water level signal. start the
In a boiler system equipped with an intermittent control water supply control means that stops the water supply pump in response to an upper limit water level signal, the period from when the water supply pump starts until it stops is measured, and the measurement result is used as a water supply period signal. and canned water concentration calculation means that executes calculations for measuring the canned water concentration based on the water supply period signal and outputs the calculation results as a canned water concentration signal. A device for measuring can water concentration in a boiler system, characterized in that the can water concentration calculating means executes a calculation for subtracting a reference water supply period in a state where there is no concentration of can water from the water supply period. 2. A communication pipe that connects the upper and lower ends of the water pipe and extracts a portion of the canned water; a lower limit water level sensor that detects that the water level of the communication pipe is at the lower limit water level and outputs a lower limit water level signal; Water level detection means includes an upper limit water level sensor that detects that the water level is at the upper limit water level and outputs an upper limit water level signal; and a water supply pump that supplies canned water into the water pipe in response to the lower limit water level signal is started, and In a boiler system equipped with an intermittent control water supply control means that stops the water supply pump in response to a water level signal, the number of times the water supply pump starts or stops during a specific period is counted, and the counting result is used as a water supply frequency signal. A water supply frequency measuring means for outputting the water supply frequency and a can water concentration calculation means for executing a calculation for measuring the concentration of canned water based on the water supply frequency signal and outputting the calculation result as a can water concentration signal are attached. A device for measuring can water concentration in a boiler system, characterized in that the can water concentration calculating means executes a calculation of subtracting the number of times of water supply from the reference number of times of water supply in a state where there is no concentration of can water.