KR20040023900A - Apparatus for controlling flow rate of cooling water in drive unit of blast furnace - Google Patents

Abstract

PURPOSE: An apparatus for controlling flux of cooling water in driver of blast furnace top is provided to control flux of cooling water supplied according to varying temperature of the furnace top driver and control drain quantity according to supplying of cooling water by adjusting water level of seal port irrespective of gas pressure in the blast furnace. CONSTITUTION: The apparatus comprises a cooling water flux detector(12) positioned on a cooling water supply pipe(10L) to detect flux of cooling water supplied to the driver(5); a temperature detector(6) for detecting temperature of the circumference of the driver; first water level detector(21) for detecting level of cooling water of lower drain tank(20) and detecting whether the water level is reached to an upper limit value or not; second water level detector(22) for detecting level of cooling water of the lower drain tank and detecting whether the water level is reached to a lower limit value or not; a control part(40) for outputting control signals of values positioned on cooling water supply pipe and drain pipe and outputting control signals of water level of seal port(30) by operating signals detected in the plurality of detectors; a seal port water level adjusting part(35) for adjusting water level by vertically moving water level adjusting plate of the seal port according to output signals of the control part; and a cooling water supply control valve(13) for controlling flux of cooling water supplied to the driver according to output signals of the control part according to opening of the valves.

Description

Flow rate control device for blast furnace drive system {APPARATUS FOR CONTROLLING FLOW RATE OF COOLING WATER IN DRIVE UNIT OF BLAST FURNACE}

The present invention relates to a device for controlling the circulation of the coolant supplied to the top drive device, and more particularly, continuously supplying the coolant supplied in order to control the temperature of the top drive device in proportion to the temperature of the drive device, The present invention relates to a cooling water flow rate control device of a blast-furnace drive device which adjusts the water level of a port irrespective of the gas pressure of the blast furnace.

The cooling water flow rate control apparatus of the conventional blast furnace top drive apparatus is described with reference to FIG. The cooling water stored in the cooling water tank 10 is forcedly circulated by the circulation pump 11 along the water supply pipe 10L to the top drive device 5 at the upper part of the blast furnace. The flow rate of the circulating coolant is detected by the flow rate detector 12, and the flow rate indicator controls the flow rate of the coolant. In addition, if necessary, the flow rate of the cooling water is manually controlled using the manual valve 14. Cooling water transferred to the upper portion of the drive device 5 through the water supply pipe 10L flows downward along the drive device 5 to lower the temperature of the drive device 5 and is located at the lower portion of the drive device 5. Stored in the lower drain 20. The water level of the lower drain 20 is always maintained the same as the level of the seal port 30, the cooling water of the lower drain 20 is passed to the cooling water tank 10 through the seal port 30. .

As shown in FIG. 2, the seal port 30 includes a fixed plate 31, a level control plate 32, and a chain device 33. The water level of the seal port 30 varies depending on the height of adjustment of the level control plate 32. The upper end of the level control plate 32 is fixed by a chain device 33. The adjustment height of the level control plate 32 is manually adjusted by opening the lid of the seal port 30 when the blast furnace internal pressure is lowered to about atmospheric pressure.

Fig. 3 is a detailed view of a drive device located at the top of a blast furnace for driving a distribution shooter, in which the drive device 5 rotates the distribution shooter 3 so that the ore discharged from the charging hopper 2 is properly distributed in the blast furnace. Be sure to The drive device (5) is located inside the blast furnace shell (1) and is attached to a heat sink so that high heat does not directly close, and coolant flows from the top of the drive device (5) to the bottom to lower the temperature of the drive device (5). . The optimum temperature for the smooth operation of the drive device 5 is approximately 70 ° C.

However, the temperature of the upper part of the blast furnace in which the drive device 5 is installed is usually changed to 142 to 323 캜, 470 to 500 캜 for overheating and 80 to 10 캜 for cooling. In order to stabilize the temperature of the drive device 5 quickly, the cooling water must have a supply amount and a drainage amount. Conventionally, the cooling water is supplied regardless of the drainage amount. In addition, the irregular fluctuations in the temperature of the blast furnace affect the drive device 5, whereas the amount of cooling water supplied by the driver is manually adjusted by the manual valve 14 so that the temperature of the drive device 5 is always large. It fluctuates, making it difficult to operate smoothly, leading to shortened life and frequent failures. The water level of the seal port 30 is adjusted according to the height of the water level control plate 32 by opening the cover when the gas pressure inside the blast furnace is at atmospheric pressure, the cooling water and blast furnace gas is ejected when the cover is opened in the normal operation state. Level adjustment of the pot 30 is impossible

That is, when the temperature of the drive device 5 rises, the manual valve 14 is opened to increase the amount of cooling water supplied, and the water level of the seal port 30 is fixed. At this time, the cooling water of the lower drain 20 can not be drained to the seal port 30 or the cooling water tank 10, the cooling water level of the lower drain 20 is increased. The cooling water level of the lower drain 20 is gradually increased, the flow of blast furnace gas is unstable by the cooling water flowing into the blast furnace. When the temperature of the drive device 5 is lowered below an appropriate temperature, the amount of cooling water supplied decreases, but the water level of the seal port 30 is fixed. At this time, the cooling water level of the lower sump 20 is lowered, blast furnace gas is penetrated into the drive unit 5 through the lower sump 20, dust is accumulated in a precisely configured gears of the drive unit 5 A failure occurs.

The present invention is to solve the above conventional problems, the purpose is to control the flow rate of the cooling water supplied according to the changing temperature of the top drive device, the gas pressure inside the blast furnace so that the drainage is adjusted according to the supply amount of cooling water It is to provide a cooling water flow rate control device of the blast furnace top drive device to adjust the level of the seal port irrespective of the above.

1 is an overall schematic view of a cooling water flow rate control apparatus of a conventional blast furnace top drive apparatus.

Figure 2 is a detailed internal view of the conventional drive system of the blast furnace.

3 is a detailed view of a conventional seal pot.

4 is a detailed view of the seal pot of the present invention.

5 is an overall schematic view of a cooling water flow rate control device of a blast furnace top drive device according to the present invention.

6 is a control diagram of a cooling water flow rate control device of the blast furnace top drive device according to the present invention.

Fig. 7 is a detailed view of the control unit relating to the cooling water flow rate control device of the blast furnace top drive device according to the present invention.

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

13: Cooling water supply control valve 20: Lower sump

22: second water level detector 23: coolant drain valve

30: seal pot 35: seal pot level control unit

36: cylinder 37: servo valve

40: control unit 41: temperature control calculator

42: flow control calculator 43: first ratio

As a means for achieving the above object of the present invention, the cooling water of the cooling water tank for storing the cooling water is forced by the circulation pump to the drive device located in the upper part of the blast furnace along the cooling water supply pipe, from the top to the bottom of the drive device The coolant that flows and lowers the temperature of the drive device is stored in the lower sump and seal port located at the lower part of the drive device, and when the temperature exceeds the appropriate value, the device is drained back to the coolant tank.

A coolant flow rate detector positioned in the coolant supply pipe and detecting a flow rate of the coolant supplied to a drive device;

A temperature detector for detecting an ambient temperature of the drive device;

A first level detector for detecting the level of cooling water in the lower sump and detecting whether the level reaches a limited upper limit;

A second water level detector for detecting a coolant level in the lower sump and detecting whether the water level reaches a limited lower limit;

A control unit configured to calculate signals detected by the plurality of detectors, output a signal for controlling valves disposed in the supply pipe and the drain pipe of the coolant, and output a signal for controlling the water level of the seal port;

A seal pot water level adjusting unit for adjusting the water level by moving the water level adjusting plate of the seal port up and down according to the output signal of the controller;

Cooling water supply control valve for adjusting the flow rate of the cooling water supplied to the drive device in accordance with the opening degree of the valve in accordance with the output signal of the control unit;

Characterized in having a.

Hereinafter, the cooling water flow rate control apparatus of the blast furnace according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

5 is an overall schematic diagram of a cooling water flow rate control apparatus of a blast furnace top drive apparatus according to the present invention, which is located in the cooling water supply pipe 10L and detects the flow rate of the cooling water supplied to the drive apparatus 5; ), A temperature detector 6 for detecting the ambient temperature of the drive device 5, and a first coolant level for detecting the coolant level of the lower drain 20, and detecting whether the level reaches a limited upper limit value. A water level level detector 21, a second water level detector 22 for detecting the coolant level in the lower sump 20, and detecting whether the water level reaches a limited lower limit, and the plurality of detectors The control unit 40 outputs a signal for controlling a plurality of valves located in the supply pipe 10L and the drain pipe 23L of the cooling water, and outputs a signal for controlling the water level of the seal port 30 by calculating the received signal. Wow, According to the output signal of the control unit 40, the level control plate 32 of the seal port 30 is moved up and down to adjust the water level to the seal port level control unit 35 and the output signal of the control unit 40. Accordingly, the cooling water supply control valve 13 adjusts the flow rate of the cooling water supplied to the drive device 5 according to the opening degree of the valve.

In addition, the device of the present invention, when the water level of the lower drain 20 is to be drained quickly beyond the appropriate value, the lower drain 20 and the cooling water tank (20) to be drained to the cooling water tank 10 without passing through the seal port ( 10 is further provided with a drain pipe 23L for connecting and a cooling water drain cutoff valve 23 positioned in the drain pipe 23L to adjust the flow rate of the coolant drained in accordance with the opening and closing of the valve.

Looking at the configuration of the seal port 30 and the seal pot level control unit 35 in more detail with reference to Figure 4, the seal port 30, the inlet connected to the lower drain 20, and the coolant It is installed vertically between the outlet connected to the tank 10, and includes a fixed plate 31 having a window of a predetermined size, and a level control plate 32 which is located between the fixed plate 31 to adjust the height of the window while moving up and down The seal port level control unit 35 is connected to an upper portion of the level control plate 32 to move up and down a cylinder 36, and a servo connected to the cylinder 36 to drive the cylinder 36 up and down. Valve 37.

The control unit 40 will be described with reference to FIG. 6, the temperature control calculator 41 for PID operation by inputting the temperature detection value and the temperature set value detected by the temperature detector 6, and the temperature control calculator 41 In the first ratio 43 and the second ratio 44, the output signal of the second ratio 44 and the flow rate detector 12 are inputted and outputted as a constant ratio value. In the flow rate control unit 42 and the second water level level detector 22 which control the coolant supply control valve 13 for adjusting the supply amount of the coolant by inputting PID operation by inputting the detected flow rate detected value of the coolant. When the limited low water level is reached, the relay 1 is operated to send an output signal to the adder 46, and the output signal of the setter 45 and the output signal of the first proportioner 43 are input and set. An adder 46 for controlling the servovalve 37 by adding an output signal of the counter 45; When the high water level is limited in the first water level detector 21, the relay 2 is operating and a power supply unit (47) for controlling the cooling water drain shut-off valve (23).

Hereinafter, the present invention will be described in detail with reference to the detailed control of FIG. 7.

The temperature detection value PV and the temperature set value SV of the temperature detector 6 installed in the drive device 5 are input to the temperature control calculator 41 and PID-operated, and the PID-calculated operation value MV is To proportioner 1 43 and proportioner 2 44;

The temperature calculation value MV input to the proportioner 1 43 is converted into a voltage signal according to the ratio characteristic of the proportioner 1 43, and is input as an electrical signal of the servovalve 37 via the adder 46. . The vertical motion of the cylinder 36 is controlled according to the electric signal input to the servovalve 37. When the electric signal of the servovalve 37 decreases, the cylinder 36 moves downward, and the cylinder 36 The fixed water level adjusting plate 32 is lowered and the water level of the seal port 30 is lowered. On the contrary, when the electrical signal of the servovalve 37 increases, the cylinder 36 moves upward, and the level control plate 32 rises upward to raise the level of the seal port 30. That is, the servovalve 37 controls the level control plate 32 in accordance with the ratio characteristic of the proportioner 1 43, so that the water level of the seal port 30 is continuously changed according to the temperature of the drive device 5, and injected. It changes according to the flow rate of cooling water.

The temperature calculation value MV input to the proportioner 2 44 is converted according to the ratio characteristic of the proportioner 2 44 to become the set value SV of the flow rate control calculator 42, and the flow rate detector ( The flow rate detection value of 14) becomes the detection value PV of the flow rate control calculator 42. The opening degree of the coolant supply control valve 13 is controlled according to the operation value MV obtained by PID operation of the two values. The coolant supply control valve 13 has a large opening when the calculation value MV increases, and a small opening when the calculation value MV decreases. As a result, the flow rate of the cooling water is continuously controlled in accordance with the detected temperature of the drive device 5.

The temperature of the drive device 5 according to the ratio characteristics of the proportioner 1 43 and the proportioner 2 44, into which the calculated value MV of the temperature control calculator 41 is input, is a proper temperature (approximately 70 ° C.). The process to be controlled will be described by way of example as numerical values of the devices of each stage.

For example, when the calculated value MV is 41 ° C., the height of adjustment of the level control plate 32 is 255 mm by the proportioner 1 43, and the cooling water supply control valve is controlled by the proportioner 2 44. The opening degree of 13) is controlled so that the flow rate detected by the cooling water flow rate detector 12 is 10 m 3 / h.

For example, when the calculated value MV is 70 ° C., the height of adjustment of the level control plate 32 is 127 mm by the proportioner 1 43, and the cooling water supply control valve is controlled by the proportioner 2 44. The opening degree of 13) is controlled so that the flow rate detected by the coolant flow rate detector 12 is 22 m3 / h.

For example, when the calculated value MV is 150 ° C., the height of adjustment of the level control plate 32 is 0 mm by the proportioner 1 43, and the cooling water supply control valve is controlled by the proportioner 2 44. The opening degree of 13) is controlled so that the flow rate detected by the coolant flow rate detector 12 is 44 m3 / h.

When the water level of the seal port 30 and the flow rate of the cooling water are continuously controlled, if the water level of the lower drain 20 is continuously raised or lowered, the cooling water level of the lower drain is lower than the level detectors 33 and 34. Is detected by.

When the first water level detector 21 for detecting a limited upper limit of the coolant level of the lower drain 20 is operated, the contact R2 of the relay 2 is turned on as shown in FIG. 7, and the coolant drain valve Power is supplied to (23) so that the coolant drain valve (23) is open. Thus, the cooling water of the lower drain 20 through the cooling water drain valve 23 is urgently drained to the cooling water tank 10, the level of the lower drain 20 is lowered. When the water level of the lower drain 20 is lowered and the first level detector 21 is stopped, the contact R2 of the relay 2 is turned off, and the cooling water drain cutoff valve 23 is closed. . Therefore, the problem that the water level of the conventional lower drain 20 is increased and the coolant flows into the blast furnace is solved.

When the second water level switch 22 is operated because the coolant level of the lower drain 20 reaches a limited lower limit, the contact R1 of the relay 1 is turned on as shown in FIG. 7, and the adder ( The output signal of the setter 45 inputted to 46 is added. The added electrical signal raises the level of the seal pot 30 by raising the level control plate 32 upward to increase the level of the lower drain 20. When the water level of the lower drain 20 is increased and the second water level detector 22 is stopped, the contact R1-b of the relay 1 is turned on, and the output signal of the setter 45 is cut off. A zero value, which is a ground signal, is input to the adder 46. The electric signal added only to the output value of the first scaler 43 lowers the level of the seal pot 30 by lowering the level control plate 32 to lower the level of the lower drain 20. Therefore, the problem that the water level of the conventional lower drain 20 is lowered and the blast furnace gas penetrates into the drive device 5 to cause a malfunction of the equipment is completely solved.

The present invention continuously adjusts the flow rate of the cooling water supplied according to the temperature of the drive device to maintain the proper temperature of the drive device, by adjusting the water level of the seal port regardless of the pressure inside the blast furnace according to the flow rate of the cooling water supplied In this case, the coolant in the lower sump overflows into the blast furnace, or the blast furnace gas flows back into the drive system, thereby having an excellent effect of completely solving the problem.

Claims (4)

The coolant in the coolant tank, which stores the coolant, is forcedly circulated by the circulation pump to the drive unit located above the blast furnace along the coolant supply pipe, and the coolant which has flowed down from the top of the drive unit to lower the temperature of the drive unit is The coolant flow rate control device that is stored in the lower drain and the seal port located at the bottom and is drained back to the coolant tank when it exceeds the appropriate value, A coolant flow rate detector positioned in the coolant supply pipe and detecting a flow rate of the coolant supplied to a drive device; A temperature detector for detecting an ambient temperature of the drive device; A first level detector for detecting the level of cooling water in the lower sump and detecting whether the level reaches a limited upper limit; A second water level detector for detecting a coolant level in the lower sump and detecting whether the water level reaches a limited lower limit; A control unit configured to calculate signals detected by the plurality of detectors, output a signal for controlling valves disposed in the supply pipe and the drain pipe of the coolant, and output a signal for controlling the water level of the seal port; A seal pot water level adjusting unit for adjusting the water level by moving the water level adjusting plate of the seal port up and down according to the output signal of the controller; Cooling water supply control valve for adjusting the flow rate of the cooling water supplied to the drive device in accordance with the opening degree of the valve in accordance with the output signal of the control unit; Cooling water flow rate control device of the blast furnace drive system characterized in that it comprises a. According to claim 1, wherein the seal pot level control unit A cylinder connected to an upper portion of the level control plate for moving the water level of the seal port up and down to adjust; A servo valve connected to the cylinder to drive the cylinder up and down; Cooling water flow rate control device of the blast-furnace drive device comprising a. According to claim 2, The cooling water flow rate control device of the blast furnace top drive device A drain pipe connecting the lower drain container and the coolant tank so that the coolant is drained to the coolant tank without passing through the seal port; A cooling water drain cutoff valve disposed on the drain pipe to adjust a flow rate of the cooling water drained according to opening and closing of the valve; And further comprising, when the water level of the lower sump reaches the upper limit of the first water level level detector, the controller outputs a signal for controlling the opening degree of the cooling water supply control valve blast furnace drive device characterized in that Coolant flow control device. The method of claim 1, wherein the control unit A temperature control calculator configured to perform PID operation by inputting a temperature detection value and a temperature set value detected by the temperature detector; A first scaler and a second scaler, for which a calculated value of the temperature control calculator is input and output as a predetermined ratio value; A flow rate control calculator configured to perform PID operation by inputting an output signal of the second rater and a flow rate detection value of the coolant detected by the flow rate detector to control the coolant supply control valve; A setter for outputting an output signal to an adder when relay 1 is operated when the level of the second water level detector reaches a limited lower limit value; An adder configured to control the servovalve by adding an output signal of the setter by inputting an output signal of the setter and an output signal of the first scaler; A power supply device configured to control the coolant drain valve by operating relay 2 when the limited high water level is reached in the first water level detector; Cooling water flow rate control device of the blast-furnace drive device comprising a.