JPS596891B2 - Blast furnace blower branch pipe flow control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blast furnace branch pipe flow rate control device, and more particularly to a blast furnace branch pipe flow rate control device that allows stepless adjustment of air volume.

For the purpose of improving the efficiency and stability of blast furnace operations,
In recent years, research has progressed on various methods for determining furnace condition, operating methods, etc., and various control devices necessary for this have been developed. This is done by installing tuyeres of different diameters in advance depending on the installation position of the tuyere.

However, the conventional flow rate control means can only control the total amount of air blown, and cannot control the flow rate on a daily basis.

Additionally, as an alternative to the above-mentioned means, means have been taken to control the amount of heavy oil or other fuel added to the hot air near each tuyere, but even this method cannot sufficiently achieve the intended purpose. It was something.

The present invention aims to improve control accuracy and controllability by making it possible to individually control the air flow rate to an optimum value for each wall in a branch pipe section of a blast furnace air blowing system, and to achieve excellent maintainability. It was developed with the aim of providing a blast furnace branch pipe flow rate control device that could be easily applied to existing blast furnaces, and its gist was as follows:
A valve member made of a heat-resistant material that is inserted into the curved pipe section to change the passage area in the curved pipe section of the branch pipe that is piped between the annular pipe of the hot air blast pipe of the blast furnace and the tuyere opening into the furnace. a shaft body that protrudes outside the curved pipe portion and allows the valve member to be operated to adjust the passage area outside the branch pipe; and a shaft body that is coupled to a protruding portion of the shaft body outside the branch pipe and applies a force for opening and closing the valve member to the shaft body. It is characterized in that it has a driving device for providing air flow, and the passage area of each branch pipe can be adjusted to control the amount of air flowing out from each tuyere.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a branch pipe system for one tuyere 1, which includes an upper curved pipe 3 communicating with an annular pipe 2, a vertical pipe 4 connected to this upper curved pipe 3 via a flange, A lower bent pipe 5 connected to this vertical pipe 4, a blow pipe 6 connected to this bent pipe 5 via a flange, a blade that penetrates the furnace body shell 7 and the furnace wall refractory 8 and opens into the furnace. Consists of mouth 1.

The lower bent pipe 5 has a T-shape, and is lined with a refractory lining 9 on the inside, and a valve member 10 made of a heat-resistant material is inserted from the rear end of the lower bent pipe 5.

This valve member 10 has a cylindrical shape as shown in FIG. 5, and has a through hole 11 for tuyere observation bored in the center of the axis, and has an arcuate cross section perpendicular to the axis at the tip. A valve part 12 having a
The vertical hole passage 13 is opened and closed by slidingly contacting the opening edge of an opening 15 opening into the horizontal hole passage 14 of the vertical hole passage 13.

That is, as shown in FIG. 3, the width of the outer circumferential surface of the valve portion 12 having a circular arc surface is such that it can slide against and close the opening edge of the opening 15 of the vertical hole passage 13 of the lower curved pipe 5. has
By rotationally displacing the valve member 10, the opening area of the vertical hole passage 13 is determined by the area of the gap formed between the side edge of the valve portion 12 and the opening edge.

The shaft body 16, which is integrally constructed with the valve member 10, is a seal for preventing air leakage of the shaft support member 17 which is projected from the rear end of the lower curved pipe 5 and supported by the lower curved pipe 5. The shaft body 16 is rotatably supported by a shaft bearing portion 18 having a mechanism, and an operating member 19 for imparting rotation to the shaft body 16 is fixed to the protruding end portion of the shaft body 16 .

In this embodiment, the operating member 19 is configured to be rotated directly and manually, but it may also be configured to be connected to other appropriate driving means so that it can be operated automatically and remotely. You can do it.

As shown in FIG. 4, the bearing member 17 has projections 20, 20 protruding in the radial direction, and pins 22, 22
engaging the locking members 23, 23 pivotally supported by the
A locking tool 24 that is driven in the diametrical direction of the locking members 23, 23.
, 24, the bearing member 17 is fixed to the lower curved pipe 5 in close contact with the lower bent pipe 5.

According to this, the valve member 10 can be easily pulled out from the lower curved pipe 5 by removing the connectors 24, 24,
This is truly convenient during maintenance, inspection, and repair.

Since the present invention has the above configuration, the valve member 10 is rotated within the horizontal hole passage 14 in the lower curved pipe 5 by rotating the operating member 19 of the shaft body 16 protruding from the rear end of the lower curved pipe 5. The valve portion 12 changes the opening degree of the opening 15 of the vertical hole passage 13, thereby selecting the optimal air volume sent out from the tuyere 1, and controlling the air volume for each tuyere 1. be able to.

Therefore, according to the present invention, the hot air fed to the blast furnace can be easily and accurately controlled for each tuyere, so that operational efficiency and stability can be achieved.

Still, in the present invention, by appropriately designing the shape of the valve portion of the valve member, control characteristics can be controlled over a wide range, and control accuracy can be greatly improved.

Furthermore, since the opening area of the valve member can be adjusted by operating it from outside the branch pipe, it is not only easy to operate, but also enables automatic control by a computer when combined with a flow rate detection device, making it possible to easily operate the blast furnace automatically. It can be tightened.

In addition, since the valve member only needs to be installed in the lower bent pipe section, the valve member can be easily removed, making maintenance inspection and repair of the valve part extremely easy, which is extremely beneficial for management, and also reduces the need for siding and other equipment. Since this method does not require any changes, it can be applied to existing blast furnaces, resulting in extremely economical effects.

[Brief explanation of the drawing]

Fig. 1 is a partially cross-sectional schematic diagram showing an embodiment of the blast furnace blast branch pipe flow rate control device according to the present invention, Fig. 2 is an enlarged sectional view of the same main part, and Fig. 3 is the same as Fig. 2 4 is a plan view of FIG. 2, FIG. 5 is a perspective view of the valve member, and FIG. 6 is a plan view of the valve member.
It is a view taken along the line Vl-VI. 1...tuyere, 2...annular pipe, 3...upper curved pipe, 4
... Vertical pipe, 5 ... Lower curved pipe, 7 ... Furnace shell, 8
Furnace wall refractory, 9 Lining, 10 Valve member, 11 Tuyere observation through hole, 12 Valve part,
13...Vertical hole passage, 14...Horizontal hole passage, 16...
Shaft body, 17... Bearing member, 19... Operation member.

Claims (1)

[Claims] 1. In a bent pipe section of a branch pipe installed between an annular pipe of a hot air blast pipe of a blast furnace and a tuyere opening into the furnace, an opening of a vertical hole passage of the bent pipe section that is inserted into the bent pipe section. A valve member made of a heat-resistant material that rotates in sliding contact with the opening edge of the pipe to change the passage area; and a valve member that protrudes outside the bent pipe portion and can be operated to adjust the passage area by rotating the valve member outside the branch pipe. It has a shaft body with a diameter of 100 mm, and a drive device that is coupled to the external protrusion of the branch pipe and applies force for opening and closing the valve member to the shaft body, and the passage area of each branch pipe is adjusted to allow flow out from each tuyere. A blast furnace branch pipe flow rate control device, characterized in that it is capable of controlling the amount of air flowing through the blast furnace.