JPH0620076Y2 - Long object heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a long object heating device for uniformly drying and heating a long object such as a lance for blowing an oxygen jet toward a steel bath.

<Prior Art> Conventionally, as a means for drying a long object such as a lance, for example, a fourth
As shown in Figure (a), one side wall (1) of the drying furnace (1)
The upper burner (2) is installed in the upper part of a), the lower burner (3) is installed in the lower part, and the exhaust gas duct (4) is installed in the upper part of the other side wall (1b) and the top of the drying furnace (1) is installed. In some cases, an opening (1c) for directly inserting a long object (5) such as a lance is provided. However, in such a direct fire type drying means, the position where the hot air from the burners (2) and (3) directly strikes or the burner (2),
The temperature difference of the hot air between the part of the long object (5) near the position (3) and the part other than that becomes large, which causes non-uniform drying and convection in the furnace. There were problems such as the heat effect was small and hot air was not used effectively, and the amount of heat radiated from the furnace was large.

As another drying means, as shown in FIG. 4 (b), the hot air supply duct (6) is attached to the lower part of one side wall (1a) of the drying furnace (1) and the upper part of the other side wall (1b) is attached. The exhaust gas duct (4) was attached to the above, and the opening (1c) for directly inserting the long object (5) such as a lance was provided on the top surface of the drying furnace (1). However, even with such an indirect drying means, it is still difficult to make the temperature inside the furnace uniform, even if it is not as large as the temperature difference in the case of the above-mentioned direct flame type, and it is difficult to avoid uneven drying of long materials. There were also problems in terms of heat effect and heat dissipation.

The present invention has been made in view of the above points, and aims to improve the convective heat transfer effect, enable uniform drying of long objects, and save energy by shortening heating, drying, and preheating times. It is an object of the present invention to provide a long object heating device.

<Means for Solving Problems> A long object heating apparatus according to the present invention includes a plurality of long objects placed at predetermined intervals in a heating furnace in parallel with each other. A plurality of hot air pipes with their upper ends sealed around the long object are provided, and nozzles oriented in one or two directions so as to blow hot air along the tangential direction of each adjacent long object are provided. The pipes are attached at predetermined intervals along the axial direction of the pipe.

<Operation> A plurality of long objects such as lances are loaded into the heating furnace at predetermined intervals in advance. Next, hot air is blown along the tangential direction of the corresponding elongated object from the nozzles provided in parallel with the elongated object in the axial direction of the hot air pipes provided at predetermined intervals in the heating furnace. Each long object receives hot air from the nozzle at a predetermined interval in the longitudinal direction of the long object, and a swirl of hot air is generated around the long object over the entire length of the long object in the furnace. The convective heat transfer effect in the furnace is improved, and the long object is uniformly dried and heated. Then, the hot air in the heating furnace is discharged to the outside.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

(10) is a lance or other long object to be dried and heated. (11) is a heating furnace such as a drying furnace, which may be a vertical type or a horizontal type. In this example, the case of a vertical drying furnace is shown. Each long object (10) is the top surface (1) of the heating furnace (11).
1a) are vertically charged into the furnace through charging holes (11b) formed at predetermined intervals along the same straight line in the longitudinal direction, and their lower ends are slightly floated from the furnace bottom surface (11c). Set it up. (12) is a long product (10)
It is a hot air pipe provided in the heating furnace (11) in parallel with the above. This hot air pipe (12) is provided with a plurality of hot air pipes (12) in the surroundings of one long object (10). )
It is important to install the hot air blown from each nozzle (13) described later in a position tangential to the circumferential surface of the long object (10). Further, a hot air pipe (12) arranged at a predetermined interval on one row along the longitudinal direction in the heating furnace (11), and a hot air pipe (12) arranged at a predetermined interval on the other row ( Each of 12) has its upper end sealed and is at a position slightly lower than the inner ceiling (11d) of the heating furnace (11), and each lower end is on the inner bottom surface (11c) of the heating furnace (11). It is connected to the hot air blowing headers (14) arranged on both sides in the longitudinal direction, respectively. The nozzles (13) are laterally attached at predetermined intervals in the vertical direction of each hot air pipe (12), and one hot air pipe (12) is provided with long objects (10) adjacent to each other. It is divided into two directions and oriented so that hot air is blown in each tangential direction. In addition, each nozzle (13) has a higher temperature than other locations, for example, in accordance with a change in temperature distribution of the long object (10) with respect to hot air in order to uniformly dry the long object (10) and further improve heating. It is desirable that the nozzle (13) at the location corresponding to the location of the long object (10) that is to be opened / closed can be opened and closed. Then, the tangential direction of the long object (10) from each nozzle (13) of a plurality of hot air pipes (12 in this example) arranged around the long object (10). The hot air is blown toward the air, and eddy currents and convection of the hot air are generated around the elongated object (10). In the figure, (15) is a hot air suction side duct attached to the upper back portion of one side wall (11e) of the heating furnace (11).

Next, the operating state will be described.

Hot air is generated from an external hot air generator (not shown) in the heating furnace (1
1) It is sent to the hot air blowing header (14) in which hot air is branched from the header (14) and each hot air pipe (12).
Is supplied to. The hot air in the hot air pipe (12) is jetted in the tangential direction of the long object (10) from each nozzle (13) attached at a predetermined interval along the axial direction, and vortex flows around the long object. , Convection occurs over the entire length of the long product in the furnace, and the long product (10) is dried and heated. Further, if necessary, in order to further improve the drying of the long object (10) and the uniformization of the heating temperature distribution, hot air is blown from the nozzle (13) at a place where the temperature of the long object is higher than other places. Keep it closed to prevent it. The hot air in the heating furnace (11) is discharged to the outside through the hot air suction side duct (15).

<Effects of the Invention> As can be seen from the above description, the present invention is arranged in a heating furnace in which a plurality of long objects are placed at a predetermined interval and in parallel with the long objects around each long object. In addition to providing a plurality of hot air pipes with each upper end sealed, a nozzle oriented in one or two directions so as to blow hot air along the tangential direction of each of the adjacent long objects, in the axial direction of each hot air pipe. Since the long objects loaded in the heating furnace are attached at a predetermined interval along the axial direction of the hot air pipe in the tangential direction of the long objects from the nozzles provided at predetermined intervals. Hot air is blown, vortex flows around the long object, convection occurs over the entire length of the long object in the furnace, further improving the convective heat transfer effect, drying the long object uniformly, It has an excellent effect that it can be heated.

Further, even in the indirect heating method, hot air directly hits the longitudinal direction of the long object at a predetermined interval in the tangential direction, and a vortex is simultaneously generated over the entire length of each long object centering on the long object. , Drying and heating are performed efficiently, and energy saving is achieved by shortening the preheating time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a sectional side view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG.
A line cross-sectional plan view and FIGS. 4A and 4B are cross-sectional views of a conventional drying furnace. (10) ... long object, (11) ... heating furnace, (12) ... hot air pipe, (13) ... nozzle.

Claims (1)

[Scope of utility model registration request] 1. A plurality of hot air pipes having upper ends sealed in parallel with the long objects in a heating furnace in which a plurality of long objects are charged at predetermined intervals. Along with
A nozzle characterized in that nozzles oriented in one or two directions so as to blow hot air along the tangential direction of each of the adjacent long objects are attached at predetermined intervals along the axial direction of each hot air pipe. Scale heating device.