JPS6054590B2 - Vertical multistage furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a single furnace body consisting of a hearth and a furnace body so as to form an appropriate space within an iron plate outer shell using a refractory and insulating furnace material, and agitated conveyance to each hearth. This invention relates to a stacked vertical multi-stage furnace provided with means.

Conventionally, multi-stage furnaces used for roasting, firing, and incineration of ores and sludge have a furnace body and multi-stage hearth by combining refractory and heat insulating materials inside a rigid welded steel outer shell. However, due to restrictions on preventing collapse, deformation, and shifting of furnace materials due to vibration, and on means of transportation, the majority of cases are assembled and constructed at the installation site.

When constructing a vertical multi-stage furnace on-site, the bottom outer shell is mounted on a pedestal, the body shell is fixed in an airtight manner by means such as welding, and then the outer shell is secured with pieces of refractory furnace material. The bottom hearth and the lowermost hearth are assembled, a supporting stand for the furnace material pieces is assembled and installed on the lowermost floor, and the hearth and the hearth which are above it are formed on the supporting stand. In this case, the pieces of the hearth material of the hearth are arranged side by side so as to be in tensile engagement with each other. After forming the furnace chamber in this way, the temporary support is disassembled and taken out from an opening such as a manhole, moved to the upper hearth, and temporarily installed again. It forms the inner chamber of the furnace. Then, the top shell of the furnace is installed on the top tier, and the construction of the entire furnace is completed. However, in the above construction method, it is necessary to repeatedly temporarily disassemble the hearth support each time, and restrictions are imposed on the hearth space due to the construction, disassembly, and removal of the hearth support.

Furthermore, since the construction work is carried out at the installation site, a large space is required to store the furnace material pieces and auxiliary materials. On the other hand, since the outer shell steel plate has a rigid structure made by welding, the difference in thermal expansion between the furnace material and the outer shell steel plate easily causes distortion, deformation, cracks, etc. in the steel plate or the furnace material, and welding work requires skill. , it is necessary to perform sufficient heat treatment after welding and joining. Furthermore, there are various drawbacks, such as the long work required to repair fallen pieces of furnace material, and the need for a special support frame to maintain the so-called warped structure at the hearth. An object of the present invention is to eliminate the various drawbacks of the conventional vertical multistage furnace as described above, and to provide a vertical multistage furnace that can be constructed quickly and easily.

In the present invention, a jig having the same shape as the space formed by the hearth and the hearth is provided in advance, and the hearth and the hearth are constructed using a refractory and insulating furnace material based on the jig. A single furnace body is formed by fastening and fixing the ends of an outer shell steel plate divided in the circumferential direction so as to cover the furnace body by means of fastening means, respectively, to form a single furnace body. A plurality of such materials are stacked on the same axis with an agitation transfer means interposed therebetween.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention. In the figure, numeral 31 is a pedestal that supports the entire furnace. The furnace is formed by stacking a plurality of single furnace bodies on the same axis, each having a space 8 formed by a hearth 6 and a furnace body 7 above a lowermost hearth 5 . Reference numeral 1 denotes a drive device, which is connected to the vertical shaft 2 to rotate and drive the agitation and conveyance means 13 attached to the vertical shaft 2 passing through the center. Reference numeral 10 denotes an outer shell steel plate, and a fireproof leakage preventive material 14 is interposed between each single furnace body.

15 is a top shell, and 4 is a bottom shell.

FIG. 2 is a partial sectional view showing a single furnace body.

In the figure, reference numeral 9 denotes a furnace body jig, which is formed to have the same shape as the furnace space 8 shown in FIG. Then, place the furnace jig 9 on a surface plate or a smooth floor as appropriate. A hearth 6 and a furnace body 7 are assembled and formed around it using a refractory material and a heat insulating material.
Next, the outer shell iron plate 10 is clamped so as to cover the outer periphery of the furnace body 7. As shown in FIGS. 3 and 4, the outer shell steel plate 10 is divided into a plurality of parts around the circumference, and a bent part 1 is provided at each divided end.
0a and fastening means 11 are provided so that they can be fastened together. Next, the construction order of the vertical multi-stage furnace of the present invention will be explained.

First, in FIG. 1, a hearth bottom outer shell 4 is placed and fixed on a pedestal 3, and then a refractory heat insulating material is attached to form a lowermost hearth 5. Since the vertical shaft 2 is formed to be splittable, it is successively connected upwardly together with the stirring and conveying means 13. On the other hand, the single furnace body 12 formed as described above with reference to FIGS. 2 to 4 is placed and fixed on the lowermost hearth 5. Next, the vertical shaft 2 and the stirring conveying means 13 are connected to the single furnace body 1.
2, the next single furnace body 12 is stacked and fixed, and thereafter the stacks are sequentially stacked in the same manner. A fireproof leakage prevention material 14 is interposed between the single furnace bodies 12. In this way, after stacking a single furnace to the required number of stages, a furnace top outer shell 15 is stretched over the top to form a vertical multi-stage furnace. Since the vertical multi-stage furnace of the present invention has the above-described configuration, it is possible to manufacture the required number of single furnace bodies in advance, and the work area at the installation site is small, and the furnace can be installed in a harsh environment. No internal work is required.

In addition, the on-site work can be completed in a short time, and the bent portion 10a of the outer shell steel plate is zigzag so that it expands and contracts elastically in response to the expansion and contraction of the fireproof insulation material. It can be adjusted and fastened to both the shell and the repaired furnace shell. Further, since the furnace body is unitized, it is extremely easy to disassemble and assemble, and since the outer shell steel plate can be separated by releasing the fastening means, it is easy to replace the refractory material.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a partial sectional view showing a single furnace body, and Figs. 3 and 4 are a partial front view and a partial cross sectional view, respectively, showing the outer shell steel plate. It is a diagram. 4: hearth shell, 6: hearth, 7: furnace body, 9: furnace jig, 1
0: Outer shell steel plate, 11: Fastening means, 12: Single furnace body, 13
:Agitation conveyance means.

Claims (1)

[Claims] 1. In a multi-stage furnace in which a hearth made of refractory and insulating furnace material is provided in multiple stages in a furnace body lined with refractory and insulating furnace material on the inside of an outer shell iron plate, and an agitation conveyance means is attached to a shaft that passes through the multi-stage hearth, each A hearth made of refractory and insulating furnace material, a furnace shell, and an outer shell iron plate surrounding it are stacked so that the shaft passes through the single furnace body in each stage, and the expansion and contraction of the refractory and insulating furnace material is carried out at the divided ends of the outer shell. 1. A vertical multi-stage furnace, characterized in that it is provided with bending portions and fastening means that respond to the pressure, and that stirring and conveying means are incorporated in each single furnace body.