KR20030094554A - Stave temperature control apparatus in blast furnace - Google Patents

Abstract

PURPOSE: A system for controlling temperature of stave of blast furnace body is provided to prevent overheating and supercooling of the stave by automatically controlling flow of cooling water of heat exchanger according to circulation water temperature of the stave and prevent damage of the stave by increasing flow of corresponding circulation water during partial overheating of the stave. CONSTITUTION: The system comprises first to fifth cooling water flow control valves(27-1,27-2,28-1,28-2,28-3) for controlling flow of cooling water supplied to heat exchanger; first and second circulation water thermometers(27-3,28-4) installed at water supply entrance of main body system circulation water per a plurality of sections to measure temperature of main body system and reinforcement system circulation water supplied to the stave(3) respectively; and first and second temperature control parts(27,28) for controlling opening degree of the first to fifth cooling water flow control valves so that the detected temperature values of the main body system and reinforcement system circulation water become the set temperature value by comparing temperature values of main body system and reinforcement system circulation water detected in the first and second circulation water thermometers with set temperature value of main body system and reinforcement system circulation water respectively, wherein the stave temperature control system further comprises a plurality of circulation water flow control valves(21a-21d), a plurality of circulation water flow meters(20a-20d), a plurality of stave thermometers, operation part(26) and a plurality of flow control parts(22a-22d).

Description

Blast temperature control device of blast furnace body {STAVE TEMPERATURE CONTROL APPARATUS IN BLAST FURNACE}

The present invention relates to a stave facility for protecting the outer wall from the high heat generated inside the blast furnace body, and more particularly, by controlling the flow of circulating water inside the stave to ensure a stable temperature distribution over the entire surface of the blast furnace It is related with the stave temperature control apparatus of the blast furnace main body which controls so that it may be made.

In general, the stave provided between the blast furnace outer wall and the inner wall is a device for protecting the outer wall (steel shell) by cooling the surface of the blast furnace by flowing circulating water.

FIG. 1 is a view illustrating a general stave installation structure of a blast furnace body. As shown in the drawing, 356 units are installed in 12 stages from the bottom of the blast furnace to the upper part of the blast furnace (that is, the furnace section), and the 356 staves (3, Circulating water is passed through 4). At the bottom (TH end) of the blast furnace among the plurality of staves, an exit port 3b is formed around the exit port 3c, and the T1 end, which is the upper end of the blast furnace, is formed around the exit port 3d. (3e) is formed, and a stave thermometer (3a) is provided on the stave (B1 to R2) from the upper end to the furnace port at regular intervals to detect the surface temperature of the blast furnace.

Figure 2 shows a conventional temperature control device for controlling the blast furnace surface temperature by flowing cooling water to the stave of the structure as described above, by dividing the staves from the T1 stage to the S5 stage by direction, up to 0 ° ~ 90 ° Zone a, zone 90 ° ~ 180 °, zone b, zone 180 ° ~ 270 °, zone c, zone 270 ° ~ 360 °, zone d, and main system cooling water (8). 12) is supplied to the lower part of the a, b, c, d zones, respectively, and the main system coolant flowing through the a, b, c, d zones to the upper part through the piping to the main system head tank (6). After collecting, it is cooled again to be applied to the main system circulating water supply pipe 12.

Further, the strengthening system cooling water cooled by the heat exchanger cooling water 11 is supplied to the right stage of each stage through the corresponding supply pipe 13, and at the same time, the TH stage stave and the furnace circulating water temperature control valve 17. And the reinforcing system cooling water supplied to the furnace ball stave 5 through the pump 16 and discharged to the left through the staves for each stage are collected in the head tank 7 for the reinforcing system, and then again the heat exchanger cooling water 11. Cooled by) and reused.

Figure 3 shows the internal structure of the stave installed in the blast furnace body, the 'b'-shaped stave is provided in the vertical, vertical and vertical drainage pipes inside, and the thermometer (TS) is attached to the center. In the structure as described above, the main system cooling water flows from the lower part of the stave to the upper part, and the reinforcing system cooling water flows in the horizontal direction.

That is, the stave is installed inside the blast furnace shell as described above, the main shell and the reinforcing system circulating water to pass through the inside, so that the stave shell of the blast furnace is protected by cooling the stave.

The reinforcing system and the main system circulating water passing through the stave are introduced into the upper head tanks 6 and 7, respectively, and the head tanks 6 and 7 are respectively supplied with supplemental water automatically when the water level is lowered. The differential pressure level gauge (not shown) for level detection is provided, and the empty space of the head tank is always filled with nitrogen to prevent the circulating water from contacting the atmosphere to oxidize the pipe. The main system and the reinforcement system circulating water discharged from the head tanks 6 and 7 are cooled in the heat exchanger 8 and supplied to the stave again. In this case, a plurality of pumps are used to continuously circulate the circulating water. (9) is used.

Since the staves have high cooling efficiency, the staves are easily overheated or supercooled depending on the temperature of the circulating water.

Therefore, it is necessary to maintain the temperature of the circulating water according to the temperature inside the blast furnace, and is usually determined by the degree of heat load in the furnace, the atmospheric temperature, and the cooling performance of the heat exchanger 8. In the above, the influence by the cooling performance of the heat exchanger 8 is large enough to ignore the influence of other internal heat loads and the atmospheric temperature.

The cooling performance of the heat exchanger 8 is determined by various factors such as the supply amount of the cooling water 11, the temperature of the cooling water, the heat exchange plate, and the like, and is most dependent on the supply amount of the cooling water.

Until now, the supply amount of the cooling water is adjusted so that the driver manually adjusts the detected value of the stave thermometer 3a by more than a predetermined width.

For this reason, the circulating water temperature of the heat exchanger 8 becomes unstable due to the changed cooling water supply amount, and thus, the temperature of the stave also becomes unstable and affects the heat change in the furnace.

FIG. 4 is a graph illustrating a measurement of the temperature of each stave according to the cooling water temperature in the stave temperature control device as shown in FIG. 2.

In the graph of FIG. 4, when the system cooling water temperature is 60 ° C. and the tempered system cooling water temperature is 55 ° C., the temperature of the stave is measured. Even in the same stage, a temperature deviation may appear. Therefore, in the related art, the average of the measured temperature values was obtained, and the cooling water temperature control was performed by hand operation. In this case, as shown in FIG. 4, when the difference between the temperature minimum value and the temperature maximum value in the same stage is too severe (65) ° C and 341 ° C), and in this case, since the temperature of the cooling water supplied to the whole stave for cooling the portion needs to be lowered, there is a problem in that the other portion shows a supercooling phenomenon.

In addition, in the related art, when the driver manually adjusts the flow rate of the cooling water 11, a predetermined time, for example, about 20 minutes must be delayed, the temperature change occurs in the circulating water actually supplied to the stave. Temperature control was impossible.

When the stave is supercooled, alkali components (calcium oxide, sodium oxide, zinc, etc.) are attached to the furnace wall in the sintered ore, which is the internal load of the blast furnace, which lowers the cooling efficiency and deteriorates the breathability due to the gas drift phenomenon. When overheated, the problem that the stave of the B2-stage S3 stage with a high internal heat load of the blast furnace is damaged due to overheating, and the breakage of the stave, which cannot be replaced and repaired, becomes a reason for shortening the blast furnace life.

Therefore, the present invention has been proposed to solve the above-mentioned conventional problems, and its object is to automatically control the flow rate of the cooling water of the heat exchanger according to the circulating water temperature of the stave to prevent overheating and overcooling of the stave, It is to provide a device for controlling the temperature of the blast furnace body that can increase blast furnace life and stabilize the aging of the furnace by increasing the flow rate of the circulating water during partial overheating.

1 is a cross-sectional view of the blast furnace body showing a stave structure.

2 is a block diagram showing a conventional stave temperature control device.

Figure 3 is an internal perspective view showing the internal structure of the stave.

4 is a graph showing the stave temperature distribution according to the temperature of the stave circulation water.

5 is a configuration diagram showing a stave temperature control device according to the present invention.

6 is a view for explaining the overheat determination process of the stave in the stave temperature control apparatus according to the present invention.

It is a figure for demonstrating the circulation water flow rate setting operation | movement part of a calculating part in the stave temperature control apparatus by this invention.

8 is a detailed configuration diagram illustrating the temperature control action of the circulating water in the stave facility.

* Description of the symbols for the main parts of the drawings *

3: stave 3a: stave thermometer

20a ~ 20d: 1st-4th circulating water flow meter

21a to 21d: 1st to 4th circulating water flow control valve

22a to 22d: first to fourth flow control unit

23 ~ 25: 1st ~ 3rd flow rate setting part

26: calculation unit

27, 28: 1st, 2nd temperature control part

27-1 ~ 2, 28-1 ~ 3: Coolant flow control valve

27-3, 28-4: Circulating water thermometer

As a construction means for achieving the above object of the present invention, the present invention

In the blast furnace stave temperature control device in which the main system circulating water cooled in the heat exchanger is applied from the lower end to the upper end of the stave by a plurality of zones, and the reinforcing system circulating water cooled in the heat exchanger is applied for each stage of the stave. ,

First to fifth coolant flow rate control valves for controlling the flow rate of the cooling water supplied to the heat exchanger;

First and second circulating water thermometers respectively installed at the water supply inlets of the main system circulating water for each of the zones and measuring temperatures of the main system and the reinforcement system circulating water supplied to the stave;

The temperature of the main system and the reinforcement system circulating water detected by the first and second circulating water thermometers is compared with the main system and the reinforcing crab circulating water temperature set values, respectively, so as to be the set temperature. First and second temperature control unit for adjusting the opening degree;

It is provided with, characterized in that the automatic control of the circulating water temperature.

The stave temperature control apparatus of the blast furnace body according to the present invention, in addition to the above means,

A plurality of circulating water flow control valves installed at a water supply inlet of the main system circulating water for each zone of the stave to adjust a flow rate of the main system circulating water for each zone;

A plurality of circulating water flow meters for measuring the flow rate of the main system circulating water drained for each zone of the stave;

A plurality of stave thermometers measuring the temperature of each stave;

A plurality of circulating water flow rate set values are set for each temperature value of the stave, and the measured values of the plurality of stave thermometers are input to calculate the average temperature of the staves for each zone and stage, and the calculated temperature average values are compared and judged. A calculating unit configured to set the circulation water flow rate for each zone of the stave;

It is characterized in that it comprises a plurality of flow control unit for adjusting the opening degree of the circulating water flow rate control valve of the corresponding zone by receiving feedback of the detection value of the circulating water flow meter of the corresponding zone so that the circulating water of the flow rate set by the operation unit for each zone flows; .

EMBODIMENT OF THE INVENTION Hereinafter, with reference to attached drawing, the structure and operation | movement of the stave temperature control apparatus by this invention are demonstrated.

Looking at the configuration of the stave temperature control device shown in Figure 6, the main system and the reinforced system circulating water piping is installed to circulate through the heat exchanger (8), stave (3), head tank (6, 7) The heat exchanger 8 is provided with a cooling water supply pipe to which the cooling water 11 for heat exchange is supplied.

In the equipment of the structure described above, the first to fifth coolant flow rate control valves (27-1 to 2, 28-1 to 3), which are installed in the cooling water supply pipe to regulate the flow rate of the cooling water for heat exchange (11), First and second circulating water thermometers (27-3, 28) installed at the water inlet of the stave (3) and measuring the temperature of the main system and the reinforcement system circulating water that are cooled after being cooled by the heat exchanger (8). -4) and adjusting the first to fifth cooling water flow rates such that the temperatures of the main system and the enrichment system circulating water detected by the first and second circulating water thermometers 27-3 and 28-4 reach a set temperature, respectively. First and second temperature controllers 27 and 28 for adjusting the opening degrees of the valves 27-1 to 2 and 28-1 to 3 are provided. By such a configuration, the flow rate of the heat exchange cooling water is automatically controlled, and the circulation water temperature and the temperature of the stave are adjusted accordingly.

In addition, the first to fourth circulating water flow control valve is installed in the main system circulating water supply pipe for supplying the main system circulating water to the a, b, c, d zone of the stave respectively to control the flow rate of the main system circulating water (21a to 21d) and the first to fourth circulating water flowmeters (20a to 20d) installed in the main system circulating water drain pipe to measure the amount of main system circulating water drained from the a to d zones of the stave respectively; And a plurality of stave thermometers (TB3a to TS3-d) for measuring the temperature of each stave, and the first to fourth circulating water flowmeters so that the circulating water of the flow rate set in the staves of the respective zones a to d flows. The first to fourth flow rate control units 22a to 22d for controlling the opening degree of the first to fourth circulating water flow control valves 21a to 21d according to the detected values of 20a to 20d, and the circulation water according to different heat loads. Input the first to third flow rate setting section 23 to 25 with the flow rate set value and the stave temperature detection value of each stage for each of a, b, c, and d zones If the temperature is within the normal range, the first set value of the first flow rate setting section 23 is within the upper limit, and if the temperature is within the upper limit range, the second set value of the second flow rate setting section 24 is within the imaginary range. Further comprising a calculation unit 25 for applying the third set value of the to the first to third flow control unit 22a to 22d, respectively, it is possible to control the temperature of the stave for each zone.

6 to 7 is a stave temperature control apparatus according to the present invention, by comparing the temperature detection value of each zone and each stage of the stave to determine whether the temperature rises and accordingly the process of controlling the flow rate of the circulating water appears It is a circuit diagram shown.

8 is a block diagram showing the process of controlling the temperature of the circulating water in the stave temperature control apparatus according to the present invention.

The temperature control action of the stave will be described with reference to the drawings described above.

First, the 1st and 2nd temperature control parts 27 and 28 control the flow volume of cooling water so that the main system and the reinforcement system circulation water supplied to the stave 3 may maintain the set temperature.

Specifically, referring to FIG. 8, the first and second temperature control units 27 and 28 may measure the temperature of the main system and the reinforcement system circulating water measured by the first and second circulating water thermometers 27-3 and 28-4. The values are compared with the set values VR1 and VR2, respectively, and the opening degrees of the first to fifth coolant flow rate control valves 27-1 to 2 and 28-1 to 3 provided at the heat exchanger 8 are adjusted so as to be the set temperature. Adjust In the above, the set values VR1 and VR2 are the temperature values of the main system circulating water and the reinforcing system circulating water, which are set so that the total average temperature of the stave becomes the desired temperature, respectively, which is determined by the driver's target stave temperature. Therefore, it can be set.

Thus, when the temperature of the main system circulating water and the reinforcing crab circulating water is adjusted to an appropriate temperature, when the overheat occurs in the stave of a specific region due to the partial heat load in the furnace, the main system circulating water passing through the corresponding region Adjust the flow rate to cool the area where the heat load occurred.

This circulating water flow control process will be described with reference to FIGS. 6 and 7.

First, the temperature of a stave is detected by each stage and each zone by the stave thermometer 3a installed in the stave as shown in FIG.

The calculation unit 26 receives the stave temperature values detected by the plurality of stave thermometers 3a in this way, and compares the temperature set values (upper limit, imagined value) of the stave to some extent to overheat the stave of a certain part. The flow rate of the circulating water passing through the area is detected.

At this time, the temperature detection value input to the calculator 26 is a temperature average value of each zone step.

The temperature detection value of B3 stage is demonstrated as an example.

In Figure 6, TB3-a is the average temperature of zone a of B3 stage, TB3-b is the average temperature of zone b of B3 stage, TB3-c is the average temperature of zone c of B3 stage, TB3-d of B3 stage Zone mean temperature average value.

And the calculating part compares the temperature average value for each zone of B3 stage with the upper limit set value 51 and the imagined set value 53, respectively, and judges whether it is larger than a set value.

At this time, if the c-zone temperature average value of the B3 stage is larger than the set value 53 imagined, the relay RB3c-HH in Fig. 6 operates, so that the a contact is turned on in Fig. 7 and the b contact is turned off.

Therefore, the third circulating water flow rate setting value 25 for cooling at the time of overheating beyond the set value which is imagined is input to the 3rd flow rate control part 22c, and the said 2nd flow rate control part 22c is the 3rd circulating water flow rate setting value. Adjust the third circulating water flow control valve 21c so that the main system circulating water is supplied to the zone c staves as much as (25).

The first to fourth flow rate control units 22a to 22d control the opening amounts of the first to third circulating water flow control valves 21a to 21d by proportional, integral, and derivative according to the measured value.

That is, when the temperature average value for all the staves from the B3 stage to the S3 stage is lower than the upper limit set value for each of a, b, and cd zones by the same method as in FIGS. 6 and 7 described above, It judges that it is a normal state, and the 1st circulating water flow rate setting value 23 is applied to the 1st-4th circulating water flow rate control parts 22a-22d.

In this state, in a zone, if the temperature average value in one or more stages of the stages B3 to S3 exceeds the upper limit set value, the circulating water flow rate setting value to the circulating water flow control unit of the corresponding zone is the second circulating water flow rate setting value. Change to (24).

Further, in a certain zone, when the temperature average value of the one or more stages of the B3 to S3 stages is equal to or higher than the set value that is envisaged, the circulating water flow rate setting value of the circulating water flow rate control unit of the corresponding zone is the third circulating water flow rate setting value. Change to (25).

Therefore, by adjusting the circulating water flow rate for each zone according to the stave temperature, it is possible to effectively cool the partial overheating portion.

As described above, the present invention automatically controls the flow rate of the cooling water of the heat exchanger for cooling the circulating water so that the circulating water temperature for cooling the stave is maintained at an appropriate value. By changing the temperature according to the temperature detection value of the stave for each zone, it is possible to adjust the stave temperature in the desired area without overheating or subcooling of other parts, thereby stabilizing the operation of the blast furnace, Therefore, there is an excellent effect that can reduce the life reduction.

Claims (3)

In the blast furnace stave temperature control device in which the main system circulating water cooled in the heat exchanger is applied from the lower end to the upper end of the stave by a plurality of zones, and the reinforcing system circulating water cooled in the heat exchanger is applied for each stage of the stave. , First to fifth coolant flow rate control valves for controlling the flow rate of the cooling water supplied to the heat exchanger; First and second circulating water thermometers respectively installed at the water supply inlets of the main system circulating water for each of the zones and measuring temperatures of the main system and the reinforcement system circulating water supplied to the stave; The temperature of the main system and the reinforcing system circulating water detected by the first and second circulating water thermometers is compared with the main system and the reinforcing crab circulating water temperature set values, respectively, so that the set temperature becomes the set temperature. First and second temperature control unit for adjusting the opening degree; And a stave temperature control device of the blast furnace body, wherein the circulating water temperature is automatically controlled. The apparatus of claim 1, wherein the stave temperature control device A plurality of circulating water flow control valves installed at a water supply inlet of the main system circulating water for each zone of the stave to adjust a flow rate of the main system circulating water for each zone; A plurality of circulating water flow meters for measuring the flow rate of the main system circulating water drained for each zone of the stave; A plurality of stave thermometers measuring the temperature of each stave; A plurality of circulating water flow rate set values are set for each temperature value of the stave, and the measured values of the plurality of stave thermometers are input to calculate the average temperature of the staves for each zone and stage, and the calculated temperature average values are compared and judged. A calculating unit configured to set the circulation water flow rate for each zone of the stave; It further comprises a plurality of flow control unit for adjusting the opening degree of the circulating water flow control valve of the corresponding zone by receiving feedback of the detection value of the circulating water flow meter of the corresponding zone so that the circulation water of the flow rate set by the operation unit for each zone flows; The temperature control device of the blast furnace body. According to claim 2, wherein the calculating unit sets the first to third flow rate setting value in the order of heat load, and if the stave temperature average detection of each stage of each of the plurality of zones is a normal range, the flow rate of the circulating water for the entire zone is the first If it is set to the flow rate setting value and the average temperature value of one stage is over the upper limit range, the circulating water flow rate of the zone is changed to the second circulating water flow rate setting value. And a stave temperature control device of the blast furnace body, wherein the circulating water flow rate of the corresponding zone is changed to a third circulating water flow rate setting value.