JPS6016483B2 - How to operate converter sublance equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating a sublance device installed in a converter near a main lance for blowing and used for various measurements and sampling of molten steel in the furnace.

Recently, in large-capacity converter furnaces, a supplement is installed close to the main lance for blowing, and this is inserted into the furnace at the end of the blowing stage to measure the temperature, carbon content, etc. of the molten steel, and then By performing so-called dynamic control, we can improve the temperature and carbon simultaneous transfer rate during blow-up, and also automate the conventional furnace front side overflow and sampling work to save labor in this type of work and improve the environment. It has also achieved great results.

By the way, the insertion position of the sub-lance into the molten steel is required to be a place where information can be collected from representative points in the furnace, avoiding the oxygen jet point from the main lance for blowing.
It must be kept at a specified distance from the main lance for blowing rice bran.

However, in general, the diameter of the converter is quite small compared to the diameter of the center of the furnace body, and the diameter of the furnace becomes smaller due to the adhesion of base metal. Care must be taken to avoid collision with the base metal attached to the metal.

For this reason, especially in small-capacity converters, the distance between the blowing main lance and the sub-lance is inevitably shortened, but this not only reduces the measurement accuracy, which is the original function of the sub-lance, but also causes mechanical problems. However, major issues remain, such as support for both lances, interference with the lifting device, and the complication of the mounting structure due to the proximity of the main lance socket and sub-lance socket installed in the exhaust gas hood. The reality is that they have given up on installing it. For this reason, in some cases, the main lance for blowing is raised and lowered in the vertical direction as before, whereas the sub-lance is inserted at a slight incline so that it approaches the main lance for blowing within the plane of the furnace mouth. A method has also been proposed in which the main lance socket for blowing and the sub-lance socket are appropriately spaced apart from each other and are installed in the exhaust gas hood, in addition to avoiding collision with the metal attached to the furnace mouth tread. There is.

However, with this method, in addition to the fact that the sublance itself is relatively small in diameter and long, it inevitably sag due to exposure to the high temperature atmosphere in the converter, which hinders the sublance's lifting and lowering operations. Moreover, since the measurement point also changes as the level of the hot water inside the converter changes, the measurement results vary, making it significantly inferior to those with a vertical lift structure.

The present invention was invented in view of the above points, and although the main lance and sub-lance for blowing wires are configured to be raised and lowered vertically, they can be inserted safely into converters with a small diameter. The purpose of this invention is to provide a method for operating a sublance device that enables high-precision information collection. Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 is the furnace body of the converter, and 2 is the furnace □. 3 is an exhaust gas hood installed on the furnace body 1; 4 is a main lance for blowing that is inserted into the furnace through the center of the furnace mouth 2 through a socket 5 provided on the hood 3; belongs to.

Reference numeral 6 denotes a sub-lance that is inserted into the furnace through a socket 7 provided in the exhaust gas hood 3 in close proximity to the main lance 4 for blowing, and a prong 8 is attached to the tip holder of the sub-lance.

The furnace body 1, the main lance 4 for blowing rice bran, and the sub-lance 6 for blowing rice bran are of a well-known construction.
, a configuration in which the sub-lance 6 is vertically raised and lowered, and a configuration in which the furnace body is urged, which will be described later, are well known.

In the present invention, the preferential support structure of the furnace body 1 is configured such that the intersection of the axial extension of the sub-lance 6 and the furnace mouth plane moves toward the center of the furnace mouth as the furnace body 1 moves.

However, in the normal position where the furnace mouth 2 of the furnace body 1 is facing directly upward, the main lance 4 for blowing is inserted into the center and blowing is performed by blowing oxygen. is the angle (
The operating circuit of the main lance for blowing 4 is set in advance so that the main lance for blowing 4 moves up and down when it is within the range of 0, ).

When lowering and inserting the sub-lance 6, the furnace body 1 is moved in advance.

For this value movement angle, the minimum value movement limit angle (82) and the maximum movement limit angle (03) are set in advance, and the furnace body 1 is tilted within the range of both angles (02) and (83). At this time, the supplement 6 is lowered and forms an operating circuit inserted into the furnace. Therefore, according to the present invention, the intersection point between the scale line extension of the sub-lance and the furnace mouth plane moves toward the center of the furnace □ due to the movement of the furnace body, and the insertion of the sub-lance into the furnace moves the furnace body at a predetermined position. Since this is done after adjusting the angle, it is suitable for small-capacity converters where the diameter of the furnace is small and metal is attached to the edge of the furnace, making the diameter of the furnace even smaller. This makes it possible to insert a sublance with plenty of time and without any trouble.

In addition, since a sufficient distance between the sub-lance and the main lance for blowing can be secured, both lances can be functionally placed in the most preferable position, and mechanically, both lances can be supported, lifted and lowered, and attached to the exhaust gas hood. This makes it extremely easy to install sockets, etc. for the sub-lance, and the sub-lance as a whole has high reliability.The sub-lance is also raised and lowered vertically, making it easier to operate the sub-lance itself or the furnace. The measurement accuracy can be improved because there is no change in the measurement point due to changes in the hot water level inside the tank, making it possible to install a sublance even in small-capacity converters, making it an indispensable sublance for dynamic control of converters. This invention is extremely useful in expanding the scope of use of the device.

[Brief explanation of the drawing]

The drawings are schematic sectional views showing embodiments of the present invention. 1... Furnace body, 2... Furnace mouth, 3... Exhaust gas hood,
4...Main lance for blowing, 6...Sub-lance.

Claims (1)

[Claims] 1 In a converter of the type in which a sub-lance is provided close to the main rice for blowing, and both lances are vertically raised and lowered to be inserted into the converter, the sub-lance is inserted by tilting the furnace body at an appropriate angle. A method of operating a sub-lance device for a converter, characterized in that the intersection point between the axial extension of the sub-lance and the furnace mouth plane is moved closer to the center of the furnace mouth.