KR20030035584A - Measuring Apparatus and The Method for A Bubble in A Water Pipe - Google Patents

Abstract

PURPOSE: An apparatus for measuring bubbles of cooling water discharging pipes of a furnace hot blast box, and a method thereof are provided to accurately judge damage of the furnace hot blast box, thereby preventing a furnace from ceasing operations. CONSTITUTION: Ultrasonic sensors(S1,S2) are installed on both sides of cooling water discharging pipes of a disk, a seat, and a body for transmitting and receiving an ultrasonic signal. A switch(52) switches transmitting and receiving functions of the ultrasonic sensors. A transmitter(50) is connected with the switch and a CPU(40) for generating ultrasonic waves to the ultrasonic sensors. A receiver(51) receives the ultrasonic signal for amplifying the ultrasonic signals. A comparator(53) compares the size of the receiving signal with reference voltage for making a signal arriving point. A time gap measurer(54) continuously measures time when initial waveform comes out from the receiving ultrasonic signal. A CPU(40) calculates an amount of generated bubbles. A display part(42) displays the amount of generated bubbles and a measurement frequency. A signal converter(43) converts the calculated amount into a signal to appear the signal on a monitor of a computer.

Description

Bubble measuring device and method of blast furnace hot air cooling water drain pipe {Measuring Apparatus and The Method for A Bubble in A Water Pipe}

The present invention relates to a bubble measuring apparatus and method of the blast furnace hot air coolant drainage pipe, and more particularly, a disk, a toilet seat and a restitution (Disk) through which the coolant passes to prevent damage to the blast furnace hot air drift. The present invention relates to a bubble measuring device and method for a blast furnace hot air cooling water drain pipe, which accurately measures and analyzes the amount of air bubbles generated in the cooling water drain pipe of a body) so that it is possible to determine whether the hot wind water is damaged.

In general, the hot blast furnace equipment of the blast furnace is a device for supplying hot air for dissolving the iron ore stored in the blast furnace, as shown in Figure 1, the heat storage chamber for accumulating and storing the residual heat through the combustion process in the hot blast furnace ( 11) When the large blower 10 supplies wind (hot air) through the bottom, the hot air passes through the combustion chamber 12 and the mixed-cooling chamber 13 and then is supplied to the blast furnace 14 through the hot air duct 20. To produce the charter.

The hot air passing through the hot air duct 20 in the hot blast furnace facility is accompanied by a high temperature of 1200 ℃ and a high pressure of 4.0 kg / ㎠, the hot air of the high temperature and high pressure to be supplied to the blast furnace or to block the supply The hot air valve is composed of a large valve. Therefore, the cooling water flow path is formed in each hot spot to prevent damage due to overheating. The cooling water flow paths include disks 21a and 21b and seats 22a and 22b as shown in FIG. 2. ) And body 23a, 23b.

However, since the hot air fluctuation is located at the site where hot air of high temperature and high pressure acts, cracks, which are local damages, are generated due to the continuous opening and closing operation and physical shock caused by other disturbance factors. Due to the damage, hot air that has passed through the hot air path penetrates into the damaged part of the hot air path. Accordingly, hot air is mixed in the water flowing along the cooling water flow path in a bubble state, thereby causing vibration and impact on the inner circumferential surface of the cooling water flow path. Therefore, damage occurs on the inner circumferential surface of the cooling water flow path. As a large amount of cooling water flows out, the internal refractories protecting the shell of the hot air pipe leading to the front and rear of the hot air duct are caused to cause fatal damage.

Therefore, conventionally, in order to prevent the above problems, the hot air valve 20 is separated for a long time during regular repairs to perform a precise diagnosis such as surface defect check or the like. The tower cooling water drain pipes 21b 'and 22b are disposed in the hot air drain line. The air vent valves 21c, 22c, and 23c installed in the curved part of the '23b' are completely closed and the flow of the drain pipe is submerged in the coolant drain tundish 35 so that the drain pipe is immersed in water to damage the hot air valve. If bubbles are mixed in the drain pipe, air bubbles rise above the surface of the water, and the amount of air bubbles is visually checked to determine whether the hot air is damaged.

However, such a conventional method is difficult to determine the exact damage site because it is measured by the amount of bubbles generated by the naked eye, which causes a problem in the facility management because it is not possible to establish a specific repair plan.

In addition, the above-described conventional method is made by hand, the problem is as follows.

First, at least two or three workers are required to block the flow of the drainage by blocking a conduit formed at the bottom of the coolant drain tundish 35 to collect a large amount of coolant, and then check the amount of bubble generation. The risk of worker safety accidents was always inherent due to the high frequency of work in high areas due to drainage pipes.

Therefore, many efforts have been made to improve the above-mentioned problems, among which the Korean Utility Model Application No. 97-006307 (Publication No. 98-062011: Hot air damage damage detection device of the blast furnace), After installing the reducer pipe and the bubble collection tank in each of the installed drain pipes by measuring the amount of air bubbles through the level detector during the drainage to determine the abnormality of the hot air.

However, the above method is problematic in practical use. First, it is proposed to draw the bubble collecting pipe by cutting the drain pipe of the closest part where the coolant supplied to the hot air is discharged, but the space in which the drain pipe is installed is extremely limited. Since there is a problem, there is a problem that a certain space must be secured in such a work, and there is a problem that a large amount of cost is required in terms of securing the space. There is a problem.

The present invention has been made to improve the above-described problems, hot air by continuously monitoring the abnormality of hot air fluctuations by real-time measurement of the air bubbles generated in the coolant flow path and the toilet seat and the coolant drain pipe of the hot air fluctuation. It is an object of the present invention to provide a bubble measuring apparatus and method for blast furnace hot air cooling water drainage pipe which can improve the management efficiency of the toilet equipment and prevent the decrease of productivity and prevent the safety accident of the worker in advance.

1 is a schematic diagram showing a hot air supply equipment of a typical blast furnace

2 is a schematic view showing a cooling water supply pipe and a drain pipe of a typical blast furnace hot air fluctuation

Figure 3 is a schematic diagram showing the ultrasonic sensor of the present invention installed in the blast furnace hot air cooling water drain pipe

Figure 4 is an enlarged partial schematic view of the ultrasonic sensor of the present invention installed in the blast furnace hot air coolant drain pipe

5 is a block diagram showing the bubble measurement device of the blast furnace hot air cooling water drain pipe of the present invention.

6 is a flow chart showing the operation according to the bubble measurement method of the blast furnace hot air cooling water drain pipe of the present invention.

Figure 7 is a waveform diagram showing an embodiment of the bubble detection state of the hot air cooling water drain pipe according to the present invention

FIG. 8 is a waveform diagram showing ultrasonic waveforms of pure water in a bubble-free state and water in a bubble-containing state

9 is a state diagram showing an example of an LCD display unit showing the bubble measurement amount according to the present invention;

<Explanation of symbols for the main parts of the drawings>

20: Hot wind 21a, 21b: disk (Disk)

21c, 22c, 23c: Air vent valves 22a, 22b: Seat

23a, 23b: Body 21b ': Deformed cooling water drain pipe

22b ': toilet seat coolant drain pipe 23b': toilet coolant drain pipe

35: multiple tundish 40: CPU

41: keypad 42: display unit

43: signal conversion unit 45: alarm output unit

47: serial communication unit 50: transmitter

51 receiver 52 switch

53: comparator 54: time interval measuring instrument

S1, S2: Ultrasonic Sensor

As a means for achieving the above object, the bubble measurement apparatus of the blast furnace hot air cooling water drain pipe of the present invention,

An ultrasonic sensor which is installed on both sides of an outer body of a coolant flow path of a hot wind and a coolant drain pipe of a toilet seat and a toilet, and transmits and receives an ultrasonic signal;

A switch connected to the ultrasonic sensor for switching a transmission / reception function of the ultrasonic sensor;

A transmitter connected to the switch and the CPU to generate ultrasonic waves at the ultrasonic sensors, respectively;

A receiver connected to the switch to receive and amplify the ultrasonic signal generated by the ultrasonic sensor;

A comparator connected to the receiver to compare a magnitude of a received signal with a reference voltage to make a signal arrival time;

A time interval measuring device connected to the comparator and the CPU, respectively, and continuously measuring time at which the first waveform comes out from the ultrasonic signal transmitted from the transmitter;

A CPU which controls all input / output signals, calculates bubble generation amount, and performs arithmetic control;

A keypad connected to the CPU for inputting data of the distance between the ultrasonic sensors, the average time of the measured values, the bubble alarm output range, and the alarm duration time setting;

A display unit connected to the CPU to display a bubble generation amount, a measurement frequency, and a coolant drain pipe number;

A signal conversion unit converting the value calculated by the CPU into a 4-20 mA signal and displaying it on a monitor of a computer installed in the cab;

Alarm output part connected to CPU and operating alarm contact when it falls within bubble alarm output range:

A serial communication unit connected to the CPU and capable of serial communication with an external device through a communication port;

It is characterized by consisting of a power supply for supplying power.

In addition, the bubble measurement method of the blast furnace hot air cooling water drain pipe of the present invention,

Starting operation of the CPU by turning on the power supply through the power supply and detecting whether there is a key input through the keypad;

If there is a key input through the keypad, inputting data for various set values and then feeding back for the first time and starting again;

Starting a measurement if there is no key input through the keypad;

When the measurement starts, entering the reference value setting step and checking whether there is a bubble in the coolant drain pipe or not by checking a plurality of times to determine whether a bubble is in a normal state;

Displaying the result of the measurement on a display unit (LCD), outputting 4 mA at 4 to 20 mA, and repeating the measurement using the result value as a reference value for the next measurement, if no normal bubble is generated;

If it is not the normal state, that is, if the bubble is generated in the state of displaying the bubble occurrence probability on the display, and outputs 20mA at 4 ~ 20mA, after outputting the alarm and returning to the initial measurement step;

Analyzing how many of the plurality of measurements are not in a normal state after the reference value is set, displaying the percentage ratio on the display, and outputting 4 to 20 mA;

When the alarm output conditions set by the user, the alarm is output, characterized in that consisting of the step of displaying the bubble occurrence status through a computer monitor in the cab.

Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 3 and 4 of the accompanying drawings.

Ultrasonic sensor S1 having a function of transmitting and receiving ultrasonic signals on both sides of the deformable body 21b and the toilet seat 22b and the coolant drain pipes 21b ', 22b' and 23b 'of the coolant flow path of the hot air stream. , S2) respectively.

Next, the bubble measuring apparatus of the blast furnace hot air cooling coolant drain pipe of the present invention with reference to Figure 5 of the accompanying drawings in detail as follows.

The ultrasonic sensors S1 and S2 provided on both sides of the cooling water drain pipes 21b ', 22b', and 23b '(shown in FIG. 3) are connected to a switch 52 for switching the transmission / reception function of the ultrasonic sensor. The receiver 52 generates a shock wave-type ultrasonic wave to the ultrasonic sensors S1 and S2, and a receiver for receiving and amplifying the ultrasonic signals generated by the ultrasonic sensors S1 and S2. (51), respectively.

The receiver 51 is connected to a comparator 53 which compares the magnitude of a received signal with a reference voltage to make a signal arrival time, and the comparator 53 outputs an initial waveform from an ultrasonic signal transmitted from the transmitter 50. The time interval measuring instrument 54 and the transmitter 50 control all input / output signals, calculate bubble generation amount, and perform arithmetic control. Connect.

The CPU 40 further includes a keypad 41 for inputting data of the distance between the ultrasonic sensors, the average time of measurement values, the setting of the bubble alarm output range, and the setting of the alarm duration, the amount of bubble detection, and the number of measurement times. And a display unit (LCD) 42 for displaying a coolant drain pipe number, etc., a signal converting unit 43 for converting a value calculated by the CPU 40 into a 4-20 mA signal and displaying it on a monitor of a computer installed in an cab; When the bubble alarm output range, the alarm output unit 45 for operating the alarm contact, and the serial communication unit 47 for serial communication through an external device and a communication port are connected.

In the apparatus of the present invention, a power supply unit 55 for supplying a control power of DC 24V and a power power of 110 / 220V is formed.

Hereinafter, a method for measuring bubbles in the blast furnace hot air cooling water drain pipe of the present invention will be described with reference to FIGS. 5 to 6.

5 is a block diagram showing the bubble measurement apparatus of the blast furnace hot air cooling water drain pipe of the present invention, Figure 6 is a flow chart showing the operation according to the bubble measurement method of the blast furnace hot air cooling water drain pipe of the present invention.

First, when power is supplied to the entire system through the power supply unit 55, the operation of the CPU 40 is started, and at the same time it is detected whether there is a key input through the keypad 41, but if the key through the keypad If there is an input, the data is fed back for the first time after inputting data for various set values and restarted. If there is no key input through the keypad, the measurement is started.

When the measurement is started in this manner, the process proceeds to the reference value setting step to determine whether there are bubbles in the coolant drain pipes 21b ', 22b', and 23b '(shown in FIG. 3) or not in the normal state in which bubbles are not generated. Check it.

If no bubbles are generated, the measurement result is displayed on the LCD, 4mA is output at 4 ~ 20mA, and the measurement is repeated as a reference value for the next measurement.

In addition, if it is not the normal state, that is, the bubble is generated, the display of the occurrence of the bubble in probability on the display, and outputs 20mA to 4 ~ 20mA, and outputs the alarm and then returns to the initial measurement step again.

Then, after setting the reference value, it is analyzed how many of 25 measurements are not in a normal state, and displays the percentage ratio on the display unit, and outputs 4 to 20 mA.

In addition, when an alarm output condition set by the user is output, an alarm is output, and a bubble generation situation is displayed on a computer monitor in the cab.

Accordingly, the worker can easily grasp the bubble generation situation.

7 is a view showing an embodiment of the bubble detection state of the hot air cooling water drain pipe according to the present invention, (A) is a waveform diagram showing a steady state, in the steady state the arrival time of T1 is short, (B) Is a waveform diagram showing a state in which a bubble is generated, in which the arrival time of T2 is longer than the normal state, and (C) is a waveform diagram showing a bubble increase state, in which the arrival time of T3 is It appears longer than the bubble generation state.

The results indicate that when bubbles are contained in the liquid, the size of the ultrasonic reception signal is changed, resulting in a difference in reception time. Therefore, the present invention is to detect the bubble generation amount using this.

FIG. 8 is a waveform diagram showing ultrasonic waves of pure water in a bubble-free state and water in a bubble-containing state. As shown in the drawing, the ultrasonic waveform of pure water (a) is large and bubbles are generated. In the case of containing water (b), the ultrasonic wave is small.

This is a phenomenon that occurs as the ultrasonic signal is scattered or reflected by the physical resistance difference between the liquid and the gas, and the acoustic impedance may be expressed as the density of the medium times the speed of sound in the medium (Z = p * c).

Therefore, the ultrasonic signal is attenuated when the acoustic impedance difference of the medium occurs.

According to the above principle, the CPU 40 of the present invention always monitors the time when the ultrasonic signal is received and compares the difference in the reception time as the size of the ultrasonic wave received signal decreases as bubbles are generated in the coolant drain pipe. Comparing the 53 and the time interval measuring instrument 54 to detect the state of the bubble is generated, according to the display display, 4 ~ 20mA output, and will output an alarm.

Fig. 9 is a state diagram showing an example of an LCD display showing a bubble measurement amount, where [A] is a bubble amount display state diagram when no bubbles are detected, and [B] is a bubble amount display state diagram when bubbles are detected. When the initial setting is completed, the ultrasonic reception time in the cooling water drainage pipe is measured about 25 times per second, and it is determined whether or not bubbles are contained by comparing with the ultrasonic reception time allowable range in the cooling water drainage pipe when it is normal. In about 25 measurements, the number of times a bubble is detected is displayed as a probability on the LCD display and then a signal of 4-20 mA is output and displayed on a computer monitor in the cab. The bubble volume can be monitored remotely.

In the monitoring method, if a bubble is detected at least once, an alarm signal is output and the display state of the bubble generation amount is repeated.

In addition, when the bubble is no longer detected, the alarm signal is maintained for the time set by the user (for example, about 5 seconds), and the alarm signal output is stopped to end the measurement of the bubble generation amount.

As described above, by measuring and analyzing the amount of bubbles generated in the cooling water drainage pipe accurately by the bubble measuring device and the method of the blast furnace cooling water drainage pipe of the present invention, it is possible to accurately determine whether or not the hot air damage damage, accordingly It is possible to improve the management efficiency of the blast furnace, and to prevent the continuous operation of the blast furnace, thereby preventing the decrease in productivity and preventing the safety accident of the worker.

Claims (2)

In the bubble measuring apparatus of the blast furnace hot air cooling water drain pipe, the outside of the coolant water discharge pipes 21 b ′, 22 b ′, 23 b ′ of the deformable body 21 b, the toilet seat 22 b, and the retardation 23 b, which are the cooling water flow paths of the hot air cooler 20. Ultrasonic sensors S1 and S2 installed on both sides to transmit and receive ultrasonic signals; A switch 52 connected to the ultrasonic sensors S1 and S2 for switching the transmission / reception function of the ultrasonic sensors; A transmitter 50 connected to the switch 52 and the CPU 40 to generate ultrasonic waves to the ultrasonic sensors S1 and S2, respectively; A receiver (51) connected to the switch (52) for receiving and amplifying the ultrasonic signal generated by the ultrasonic sensor; A comparator 53 connected to the receiver 51 to make a signal arrival time by comparing a magnitude of a received signal with a reference voltage; A time interval measuring instrument (54) which is connected to the comparator (53) and the CPU (40), respectively and continuously measures the time at which the first waveform comes out from the ultrasonic signal transmitted from the transmitter (50); A CPU 40 for controlling all input / output signals, calculating bubble generation amounts, and performing arithmetic control; A keypad 41 connected to the CPU 40 for inputting data of distance between ultrasonic sensors, average time of measured values, bubble alarm output range, and alarm duration time setting; A display unit 42 connected to the CPU 40 to display the bubble generation amount, the number of times of measurement and the number of cooling water drain pipes; A signal conversion unit 43 for converting the value calculated by the CPU 40 into a 4-20 mA signal and displaying it on a monitor of a computer installed in an cab; An alarm output unit 45 connected to the CPU 40 to operate an alarm contact when it falls within the bubble alarm output range: A serial communication unit 47 connected to the CPU 40 and capable of serial communication with an external device through a communication port; Bubble measuring apparatus of the blast furnace hot air coolant drainage pipe, characterized in that consisting of a power supply unit for supplying power. A bubble measuring method of a blast furnace hot water cooling water drainage pipe, the method comprising: detecting whether there is a key input through a keypad (41) by the operation of the CPU (40) by power input through a power supply (55); If there is a key input through the keypad, inputting data for various set values and then feeding back to the first and starting again; Starting a measurement if there is no key input through the keypad; When the measurement is started, entering the reference value setting step and checking whether there are bubbles in the coolant drain pipes 21b ', 22b', and 23b 'by checking a plurality of times to determine whether bubbles are in a normal state; Displaying the result of the measurement on a display unit (LCD), outputting 4 mA at 4 to 20 mA, and repeating the measurement using the result value as a reference value for the next measurement, if no normal bubble is generated; If it is not normal, that is, bubbles are generated, the display unit displays the occurrence of bubbles at a probability, outputs 20 mA at 4-20 mA, returns to an initial measurement step after outputting an alarm; Analyzing how many times a plurality of measurements are not in a normal state after the reference value is set, displaying the percentage ratio on the display, and outputting 4 to 20 mA; And a step of outputting an alarm when the alarm output condition is determined by the user and displaying a bubble generation situation through a computer monitor in the cab.