JPH0140083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a valve operating device for recovering CO gas from a converter exhaust gas treatment device.

[Prior Art] First, the outline of a converter exhaust gas treatment apparatus will be explained using FIG. 3.

In the figure, pure oxygen is blown into a converter 1 from an oxygen injection lance 2 for blowing. At this time, a large amount
CO gas is generated.

After this CO gas is cooled by a cooler 3, dust is removed by dust removers 4 and 5, and the CO gas is recovered into a gas holder 10 as a valuable gas.

This CO gas is recovered as follows. Gas with low CO concentration at the beginning and end of blowing is combusted and released from the chimney 11 by operating the switching valves 7 and 8. At this time, the water seal check valve 9 is in a closed state. The state shown in FIG. 3 shows a state in which gas with a low concentration of CO gas is released from the chimney 11 at the beginning and end of blowing. Next, CO at the peak of blowing
For high-concentration gas, close the switching valve 7, open the switching valve 8, and open the water seal check valve 9 to release the gas into the gas holder 10.
to be collected. The above switching valves 7, 8 and water seal check valve 9
The operation is performed by valve operating cylinders 12 and 13. Note that 6 in the figure is an induced blower.

FIG. 4 shows an operating device for a conventional CO gas recovery valve (switching valves 7, 8, water seal check valve 9). In the figure, the forward main high pressure line 20 and the reverse main high pressure line 27 of the valve operating cylinders 12 and 13 are switched by a switching solenoid valve 26, and the valve operating cylinders 12 and 13 are switched by a switching solenoid valve 26.
It was designed to perform 13 forward and backward movements.

[Problems to be solved by the invention] Since the conventional CO gas recovery valve operating device was configured as described above, the valve operating cylinder 12,
Due to the high back pressure of the cylinder when moving the 13 forward or backward, it takes a long time (15 seconds to 20 seconds) to open and close the valve.
seconds).

As a result, as shown in Fig. 2, since the operation times _T1 and _T3 of the CO gas recovery valve required 15 to 20 seconds, the CO gas recovery time _T2 became shorter, and by that amount,
The drawback was that the amount of CO gas recovered was small.

Therefore, the present invention aims to provide a CO gas recovery valve operating device that recovers more CO gas by shortening the operation time of the CO gas recovery valve.

[Means for solving the problems] In order to solve the above-mentioned conventional problems, the present invention has the following features:
The valve opening/closing time is shortened by increasing the differential pressure between the operating side pressure of the cylinder and the back pressure generated when the valve operating cylinder is moved forward or backward.

That is, an automatic pressure switching valve is provided in each of the main high pressure lines for forward and reverse movement of the valve operating cylinder, and an automatic pressure switching valve is provided in the forward line and the reverse line branched from the main high pressure line and provided in the forward line of the valve operating cylinder. The automatic pressure switching valve is provided with a pilot line that supplies high-pressure working medium through the cylinder switching solenoid valve.

On the other hand, the pressure of the working medium branched from the main high-pressure line or the pilot line is reduced by a pressure reducing valve, and this reduced working medium and the high-pressure working medium passing through the forward line and reverse line are transferred to each automatic pressure via a pressure reducing switching solenoid valve. Install a pressure reduction line leading to the switching valve. Further, the pressure reduction switching solenoid valve is operated by a signal for fully opening or fully closing the valve.

[Function] With the above configuration, the pressure inside the cylinder on the operation side of the valve operation cylinder is increased by the high pressure working medium supplied from the pilot line to the automatic pressure switching valve, and the pressure inside the cylinder on the operation side of the valve operation cylinder is increased by the high pressure working medium supplied from the pilot line to the automatic pressure switching valve. The pressure side is reduced in pressure by the pressure reduction line, and the pressure difference between the operation side and the back pressure side of the valve operation cylinder becomes large, and the time required for opening and closing the valve is shortened.

[Example] An example of the present invention will be described in detail below.

In FIG. 1, 7 and 8 are switching valves, 9 is a water seal check valve, 12 and 13 are valve operating cylinders, and the third
Same as shown in the figure. Reference numeral 20 denotes a main high pressure line, and this main high pressure line 20 is divided into a forward line 28 and a reverse line 29 for the valve operating cylinders 12 and 13, which are connected to the valve operating cylinders 12 and 13, respectively. 17 is an automatic pressure switching valve provided in the reverse line 29, and 18 is an automatic pressure switching valve provided in the forward line 28. A pilot line 21 is branched from the main high pressure line 20, and this pilot line 21 is connected to each of the automatic pressure switching valves 17 and 18 via a cylinder switching solenoid valve 16. 19 is a pressure reducing valve, which connects the pilot line 21 (or main high pressure line 2
0) Depressurize the high-pressure working medium branched out. 2
2 is a pressure reduction line. This pressure reduction line 22 is connected to automatic pressure switching valves 17 and 18 via lines 23 via pressure reduction switching solenoid valves 14 and 15, respectively. 24 and 25 are valves 7 and 8
A signal oscillator detects whether the water seal check valve 9 is fully open or fully closed, and inputs the signal to the pressure reduction switching solenoid valves 14 and 15 to operate them.

Next, the operation of this embodiment configured as described above will be explained.

First, the case where the valve is operated to the CO gas recovery side from the state shown in FIG. 3 (start of blowing) will be explained. In this state, valve 7 is fully open, valve 8 is fully closed (both valves 7 and 8 are linked, and when one is open, the other is closed),
The water seal check valve 9 is fully closed. The signal transmitter 25 detects whether the valves 7, 8, and 9 are fully open or fully closed, and inputs this signal to the pressure reduction switching solenoid valve 15 to operate it, and performs the next operation of each valve (the valve that is fully closed is Fully open, and fully close the valve that is fully open).
Maintain back pressure of 2.13. In the state shown in FIG. 1, the valve operating cylinders 12 and 13 are moving forward;
The next movement is backwards. At this time, the transmitter 25 causes the pressure reduction switching solenoid valve 15 to operate in conjunction with the pressure reduction lines 22 and 23, and the automatic pressure switching valve 18 reduces the pressure in the valve operation cylinders 12 and 13 via the forward line 28.

On the other hand, the operating side (reverse side) pressure of the valve operation cylinders 12 and 13 is controlled by the pressure reducing switching solenoid valve 14 operated by the valve switching command signal, and the pressure is applied to the pressure reducing line 2.
2 and 23 are shut off, the pilot line 31 and automatic pressure switching valve 17 are communicated, and the reverse line 29 is
The solenoid valve 16 is opened through the line 21 and is waiting for the switching solenoid valve 16 to be activated and communicated with the line 21 by the next valve switching command signal. In this way, the differential pressure between the operating side (operating side) pressure and the back pressure (advance side) of the valve operating cylinders 12, 13 becomes large, the operating time of the valve operating cylinders 12, 13 is shortened, and the valve operating time is reduced. opening/closing time is shortened.

That is, the valve 7 is closed, the valve 8 is opened, and the water seal check valve 9 is opened in a short time, and the CO gas is recovered into the gas holder 10.

During this CO gas recovery, the signal transmitter 24 detects the opening and closing of each valve and issues a signal.
4, and in preparation for the next operation (advance) of the valve operation cylinders 12, 13, the back pressure side is connected to the decompression line and held.

That is, by switching the pressure reduction switching solenoid valve 14, the pressure reduction lines 22 and 23 and the automatic pressure switching valve 17 are connected, the pilot lines 21 and 31 are cut off, and the line 30 and the automatic pressure switching valve 18 are connected and released.

From this state, before the end of blowing (at the end of blowing), by switching the cylinder switching solenoid valve 16 with a valve switching command signal, valve 7 is opened, and valve 8 and water seal check valve 9 are closed in a short time. (The state shown in Figure 3).

In Figure 2, the valve operation time is shortened to T 1 ' at the start of blowing compared to conventional _{T 1} , and to T ₃ ' compared to conventional T ₃ at the end of blowing, and CO The gas recovery time was longer at T ₂ ′ compared to the conventional T ₂ .
In other words, the amount of CO gas recovered increased only in the shaded areas D and E.

As a result of actual measurements, the conventional T ₁ =T ₃ =15 to 20 seconds was shortened to 5 to 10 seconds.

In Fig. 2, parts A and C are used for tampon gas (to create an inert gas layer to prevent explosions) during the initial and early stages of blowing and are emitted from the chimney, and B
shows the CO gas recovery part at the peak of blowing.

[Effects of the Invention] As detailed above, the CO gas recovery valve operating device of the present invention is provided with an automatic pressure switching valve in the forward and backward movement lines of the valve operating cylinder, and the automatic pressure switching valve is connected to the automatic pressure switching valve via the pressure reduction switching solenoid valve. The pilot line and pressure reduction line are connected to each other, and the pressure reduction switching solenoid valve is activated by detecting the open/closed state of each valve. When the pressure side is maintained in a reduced pressure state in advance and switched using the cylinder switching solenoid valve, the operating side pressure of the valve operation cylinder is increased by the pilot line and automatic pressure switching valve, increasing the differential pressure between it and the back pressure side. I was able to do that. As a result, the opening and closing time of the valve was significantly shortened (by approximately 1/2), increasing the amount of CO gas recovered.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the CO gas recovery valve operating device of the present invention, Fig. 2 is a diagram showing the state of CO gas recovery in comparison with the conventional method, and Fig. 3 is a converter exhaust gas treatment Diagram 4 showing the overall configuration of the device
The figure is a circuit diagram of a conventional CO gas recovery valve operating device. 1... Converter, 7, 8... Switching valve, 9... Water seal check valve, 12, 13... Valve operation cylinder, 14, 1
5...Pressure reduction switching solenoid valve, 16...Cylinder switching solenoid valve, 17, 18...Automatic pressure switching valve, 19...
...Pressure reducing valve, 20... Main high pressure line, 21... Pilot line, 22... Pressure reducing line, 24, 25
...Signal transmitter, 28...Advance line, 29...
Backward line. The switching valves 7 and 8 and the water seal check valve 9 are collectively referred to as a CO gas recovery valve.

Claims (1)

[Claims] 1. A main high pressure line with automatic pressure switching valves installed in the forward and reverse lines of the valve operating cylinder, respectively,
a pilot line branching from the main high pressure line and supplying a working medium to an automatic pressure switching valve provided in the forward line of the valve operating cylinder and an automatic pressure switching valve provided in the reverse line via a cylinder switching solenoid valve; The pressure of the working medium branched from the main high-pressure line or the pilot line is reduced through a pressure reducing valve, and the reduced pressure working medium and the high-pressure working medium passing through the forward line and the reverse line are transferred to each automatic pressure via a pressure reducing switching solenoid valve. A CO gas recovery valve operating device for a converter exhaust gas treatment device, which comprises a pressure reduction line leading to a switching valve and a signal transmitter for inputting a signal indicating whether the valve is fully open or fully closed to the pressure reduction switching solenoid valve.