JPH05187605A - Automatic blow control device for boiler - Google Patents

Abstract

PURPOSE:To obtain an automatic blow control device which is capable of maintaining a specified boiler water electric conductivity or a variation amplitude of pH values in a specified range by minimizing the above data. CONSTITUTION:A sensor 2 is installed to a boiler 5 so as to detect the electric conductivity or a pH value of boiler water. The electric conductivity or pH value of boiler water is measured based on the output of the sensor 2 at a certain cycle. The operation time or blow quantity of a blow device 1, which maintains the electric conductivity of boiler water or its pH value at a specific value or within a specified range, is decided by a decision making section 4 while a control section 3 controls the operation of the blow device 1 based on the decided operation time or the blow quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic blow control device for maintaining electric conductivity or PH value of boiler can water at a predetermined value or in a predetermined range.

[0002]

2. Description of the Related Art Usually, electric conductivity or PH of boiler can water
Values increase with boiler uptime. Conventionally, in order to maintain the electric conductivity or PH value of boiler can water within a predetermined range, the upper limit S1 and the lower limit S2 of the electric conductivity or PH of can water are set as shown in FIG. When the electric conductivity or PH value reaches the upper limit value S1, the blowing device is activated to lower the electric conductivity or PH value of the can water, and when the electric conductivity or PH value of the can water decreases to the lower limit value S2, the blowing device. And the electric conductivity or pH value of the can water is the upper limit value S1.
And the lower limit value S2 is maintained.
In addition, in FIG. 3, the vertical axis represents the electric conductivity of the canned water or the PH value, and the horizontal axis represents the boiler operating time.

[0003]

In the above-mentioned conventional automatic blower control device for a boiler, the blower device is turned on between the upper limit S1 and the lower limit S2 of the electric conductivity or PH value of the can water.
Since the -OFF control is performed, there is a problem that the fluctuation range of the electric conductivity of the canned water or the PH value becomes large.

The present invention has been made in view of the above points, and eliminates the above-mentioned problems of the conventional apparatus and reduces the fluctuation range of the electric conductivity of the canned water or the PH value of the boiler. The purpose is to provide.

[0005]

In order to solve the above problems, the present invention provides a method of setting an upper limit value S1 and a lower limit value S2 of the electric conductivity or pH value of can water as in the conventional automatic blow control device described above. No, for example, boiler can water supply pump O
An N signal or an OFF signal, a water level signal of can water, or a can water electrical conductivity or PH value of a control target is detected by a sensor at a certain timing such as a certain time interval, and the detected can water electrical conductivity or PH value is detected. The operation time or the blow amount of the blow device is decided each time according to the PH value, and the operation of the blow device is controlled by the decided operation time or blow amount.

[0006]

According to the present invention, the automatic blow control of the boiler is performed as described above so that the ON / OFF control based on the upper limit value and the lower limit value of the electric conductivity or the PH value of the can water as in the conventional case is not performed but the detected can water is detected. The operating time or the blow amount of the blower device is determined each time according to the electrical conductivity or the PH value, and the operation of the blower device is controlled by the determined operating time or blown amount. It is possible to control the value to the optimum value or the optimum width as compared with the conventional case.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of an automatic blow control device for a boiler according to the present invention. In FIG. 1, 1 is a blower,
Reference numeral 2 is a sensor for detecting electric conductivity or pH value of canned water, 3 is a control unit for controlling operation of a blowing device, and 4 is blow device 1 based on electric conductivity or PH value of canned water detected by the sensor 2.
Is a boiler, and 6 is a water supply pump for supplying canned water to the boiler 5.

In the automatic blow control device having the above structure,
The operation when the timing for determining the operation time of the blower 1 is the ON signal of the water supply pump 6 will be described. The electric conductivity of the boiler water of the boiler 5 is detected by the sensor 2 at the timing when the water supply pump 6 is turned on, and the detection output is input to the determination unit 4 of the control unit 3. The discriminating unit 4 determines the operating time of the blowing device 1 according to the electric conductivity of the detected can water and outputs it to the control unit 3. The control unit 3 controls the operation of the blower for the determined operation time.

FIG. 2 is a view showing a change state of electric conductivity of can water by the automatic blow control device of the present invention. In FIG. 2, the electric conductivity S11 of the can water detected by the sensor 2 at the time Wp1 when the water supply pump 6 is turned on is low.
Determines that the operation time of the blow device 1 is 0 second and outputs it to the control unit 3. Therefore, the control unit 3 does not operate the blower device 1 at the time Wp1. In FIG. 2, the vertical axis represents the electric conductivity of the can water and the horizontal axis represents the boiler operating time.

Next, the determination unit 4 detects the electric conductivity S of the can water detected by the sensor 2 at the time Wp2 when the water supply pump 6 is turned on.
According to 12, the operating time of the blow device 1 is determined to be t2 seconds and output to the control unit 3, and the control unit 3 controls the operation of the blow device 1 for t2 seconds. Further, in the determination unit 4, the water supply pump 6 is O
When it is N, the operating time of the blowing device 1 is determined to be t3 seconds according to the detection can water electrical conductivity S13 of the sensor 2 at time Wp3, and it is output to the control unit 3, and the control unit 3 outputs the blowing device 1 to t3.
Operation is controlled only for seconds.

Here, the operating time of the blower device 1 determined by the determination unit 4 is determined by fuzzy reasoning or the like so that the electric conductivity of the canned water to be controlled is in an optimum state from the electric conductivity of the canned water detected by the sensor 2. It may be determined by calculation, or the operation time of the blower device with respect to the electric conductivity of the can water is calculated in advance by fuzzy reasoning, etc., and the calculation result is stored as a table for the electric conductivity of the can water. Alternatively, the stored operation time may be selected based on the electric conductivity of the water in the detection can from the sensor 2.

FIG. 4 is a diagram showing a comparative example of a state of change in electric conductivity of can water by the automatic blow control device of the present invention and that by a conventional device. In FIG. 4, a solid line A shows the case according to the present invention and a dotted line B shows the case according to the conventional example. As shown in the figure, in the case of the automatic blow control device of the present invention, the fluctuation range of the electric conductivity of the boiler can water becomes smaller than that of the conventional device. In FIG. 4, the vertical axis represents the electric conductivity of the can water and the horizontal axis represents the boiler operating time.

In the above embodiment, the timing for determining the operation time of the blower 1 is set to the ON signal of the water supply pump, and the sensor 2 detects the electric conductivity of the can water at the timing.
The operation time of the blower 1 is determined by the electric conductivity of the detected canned water, and this timing may be an OFF signal of the water supply pump, a water level signal of the canned water, or a certain time interval. Similar effects can be obtained.

The determination value of the discriminating unit 4 may be a blow amount according to the electric conductivity of the detected can water, and the control unit 3 may control the operation of the blow device 1 until the blow amount is reached. The same applies when the control target is not only the electric conductivity of the can water but also the PH value of the can water.

[0015]

As described above, according to the present invention, the following excellent effects can be obtained. (1) The ON / OFF control by the upper limit value and the lower limit value of the can water electric conductivity or PH value as in the past is not performed, but the operating time or the blow amount of the blowing device according to the detected can water electric conductivity or PH value. Is determined each time, and the blower operation is controlled by the determined operation time or blown amount, so that the electric conductivity or PH value of the canned water to be controlled can be controlled to the optimum value or the optimum width as compared with the conventional case. Becomes

(2) This makes it possible to appropriately treat the water inside the boiler, and it can be expected that it will be effective in extending the life of the boiler and preventing carryover. (3) The amount of blow can be reduced as compared with the conventional example, the operation efficiency can be increased due to the reduction of the blow heat loss, and the amount of the chemical liquid input can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an automatic blow control device for a boiler of the present invention.

FIG. 2 is a diagram showing a change state of electric conductivity of can water by the automatic blow control device of the present invention.

FIG. 3 is a diagram showing a change state of electric conductivity of can water by a conventional automatic blow control device.

FIG. 4 is a diagram showing a comparative example of a change state of electric conductivity of can water between the automatic blow control device of the present invention and a conventional automatic blow control device.

[Explanation of symbols]

 1 Blow device 2 Sensor 3 Control part 4 Discrimination part 5 Boiler 6 Water supply pump

Claims (1)

[Claims] Claim: What is claimed is: 1. An automatic blow control device for a boiler, which automatically operates a blowing device to maintain an electric conductivity or PH value of boiler can water at a predetermined value or a predetermined range. A sensor for detecting a PH value, an electric conductivity or a PH value of boiler can water is detected from an output of the sensor at a certain timing, and an electric conductivity or a PH value of the boiler can water is detected from the detected electric conductivity or PH value.
A control unit for determining an operating time or a blow amount of the blow device for maintaining the value within a predetermined value or a predetermined range, and controlling the operation of the blow device with the determined operating time or blow amount. Boiler automatic blow control device.