JPH01159585A - Method of executing extennal heating type rotary furnace - Google Patents

Abstract

PURPOSE: To ensure construction of a refractory lining having a structure of a plurality of layers by connecting a furnace structure for which a lining refractory is constructed in the state where a cylindrical furnace structure iron shell is vertically provided standing at a right angle, the iron shell being divided axially and the iron shell having flanges at both opposite ends. CONSTITUTION: Flanges 24 are mounted on opposite ends of an iron skin 23, and retainers 25 are mounted at 6 positions of the iron shell. The iron skin 23 is disposed vertically on an iron plate 26, and there are succesively assembled inside the iron shell a refractor blick 16, a support refractory blick 17, and a ceramic partition plate 18 from the side close to the iron skin 23 to obtain a one unit length division furnace structure. In the assembling work there can be assembled the blick 16 and the blick 17 with the iron skin 23 kept fixed to a platen 26, so that accurate construction is facilitated. Further, the one unit length division furnace structures are connected to a reception roller through a flange by a predetermined number to ensure a rotary furnace structure. Thus, construction of refractory lining having a plurality of layer structures is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for constructing a refractory lining for an externally heated rotary furnace.

[Conventional technology]

In general, rotary furnaces are of the internal heating type, in which the combustion gas from the burner is heated while being brought into direct contact with the workpiece, or the rotary furnace is heated indirectly, through a partition wall made of heat-resistant metal or ceramic, without bringing the combustion gas into direct contact with the workpiece. There is an external heating type.

In the internal heating type, as shown in Fig. 1, the furnace body 3 has a cylindrical steel shell 1 lined with a refractory 2, and the inlet 5 is slightly horizontal to the outlet 6 with respect to the axis 4 of the furnace body 3. It is placed on the receiving roller 7J with an inclination so as to be high, and is rotated at a low speed by the drive device 8. Also, a burner 9 is attached to the outlet 6 side, and the axis 4 is connected to the burner 9.
It is designed to inject combustion gas in the direction. The workpiece 10 introduced into the inlet 5 gradually moves within the rotating furnace main body 3 toward the outlet 6 and comes into direct contact with the combustion gas from the burper 9 to be heat-treated.

The structure of the lining refractory 2 in the internal heating type furnace main body 3 will be explained as follows by way of example. In other words, in the cross-sectional view shown in FIG.
There is a heat treatment chamber 12 lined with 1. The object to be treated in the heat treatment chamber 12 is directly heat treated by conduction from the radiant lining refractory bricks from the combustion gas while being agitated as the furnace body rotates.

Next, an explanation will be given of an external heating method in which a workpiece is heated through a ceramic partition wall used at a high temperature of 1000° C. or higher.

That is, as shown in FIG. 3, a furnace main body 1 is provided with a combustion chamber 13 made of a refractory 2 inside a cylindrical steel shell 1.
4 is installed on the receiving roller 7 together with the driving device 8 with the axis line inclined as in the internal heating type. A burner 9 is attached to a furnace body 14 in the combustion chamber 13 and rotates together with the furnace body 14. The combustion gas from the burner 9 is transferred to the lining refractory 2 of the combustion chamber 13 and the ceramic partition wall 15.
is heated, and the object to be processed 10 is indirectly heated through the ceramic partition wall 15 and heat-treated.

An example of the structure of the lining refractory 2 of the furnace body 14 will be described below. That is, in the cross-sectional view shown in Fig. 4, the inside of the cylindrical steel shell l is lined with refractory bricks 16, but the height of the refractory bricks 16 is not uniform and varies, and the supporting refractory is placed at appropriate intervals. Place brick 17. The supporting refractory bricks 17 are for supporting the ceramic partition plate 18. With this configuration, a polyhedral furnace core chamber 19 surrounded by the ceramic partition plate 18 and the supporting refractory bricks 17 is constructed, and the refractory bricks 1 are arranged around the outer periphery of the core chamber 19.
6, supporting refractory bricks 17, and ceramic partition plates 18 define a plurality of combustion chambers 13. By doing so, the core chamber 19 and the combustion chamber 13 rotate as one.

The object to be treated in the furnace core chamber 19 is heat-treated while being agitated as the furnace body rotates while being shielded from combustion gas by radiation and conduction via the ceramic partition plate 18.

Next, the method for constructing the refractory lining will be explained as follows.

First, internal heating type refractory lining construction work is generally carried out in the following manner. That is, as shown in FIG. 1, after placing the cylindrical steel shell 1 horizontally on the receiving roller 7 and the driving device 8,
A predetermined length of the cylindrical steel shell 1 in the 4 axis directions is taken as one unit,
The lining of the fan-shaped refractory bricks is carried out in accordance with the order shown in FIGS. 5 to 10. First, as shown in Figure 5, the lower half of the rotary furnace center is constructed. Next, hold the jack 20 in the position shown in FIG. 6 and gently rotate it about 174 revolutions using the drive device until the jack 20 is in the vertical position as shown in FIG. Next, after constructing the right-hand side shaded part 21 shown in Fig. 8, approximately 1/2 inch is installed to the jack 20 position shown in Fig. 9.
Rotate 8 times. Finally, the right side hatched portion 22 shown in FIG. 10 is constructed to complete the furnace body having a predetermined unit length. The refractory construction for the entire length of the internal heating rotary furnace body is completed by repeating this construction for one unit length according to the procedure shown in FIGS. 5 to 10.

[Problem that the invention seeks to solve]

Next, as shown in Fig. 4, the externally heated lining refractory construction work requires a complex combination of lining refractory bricks 16 and supporting refractory bricks 17, and high dimensional accuracy is required for the installation of ceramic bulkhead plates 18. Therefore, it is difficult to construct the internal heating type furnace body shown in FIGS. 5 to 10, that is, the method of constructing the furnace body while changing the circumferential position of the furnace body using a jack in the horizontal position.

Since the construction work of internally heated lining refractories is difficult to apply to the application of externally heated lining refractories, we developed a construction method that can easily perform the precise construction work of complex externally heated lining structures. This is what we provide.

[Means for solving problems]

In order to accurately install the refractory lining of an externally heated rotary furnace, this invention divides the steel shell of the furnace body in its axial direction, and installs the refractory lining with the shell standing upright. The feature is that each part is then connected to obtain a long furnace body.

That is, as shown in FIG. 11, the steel shells 23 of the divided furnace main body are connected by flanges 24. The construction procedure for the refractory lining is as follows. As shown in FIG. 12, first, retainers 25 for fixing the lining refractory and the steel shell 23 from slipping are attached to the steel shell 23 at equal positions on the inner circumference of the steel shell 23.

It is placed on a horizontal surface plate 26. Next, as shown in FIG. 13, refractory bricks 16, supporting refractory bricks 17, and ceramic partition plates 18 are assembled on the inside of the shell in order from the side closest to the shell 23, to obtain a segmented furnace body of unit length. . This assembly work is performed by attaching the refractory bricks 16 while fixing the iron skin 23 to the surface plate 26.
, the supporting refractory bricks 17 and the ceramic partition plate 18 can be assembled, making it easy to carry out accurate construction.

An external heat type rotary furnace furnace body can be obtained by connecting a predetermined number of flange-connected one-unit-length segmented furnace bodies that have been assembled to receiving rollers.

〔work〕

According to the method of the present invention, there is no need to turn the refractory to be installed upside down, so processing with accurate dimensional accuracy is possible.

Also, since there is no need for vertical rotation, there is no need to use a jack,
Multi-layer lining construction becomes possible.

〔Example〕

As shown in FIG. 11, a furnace body having a total length of 12 m and an outer diameter of 2.5 m was divided into sections of 2 m in the axial direction, flanges 24 were attached to both ends of the steel shell 23, and retainers 25 were attached to six locations on the inner surface. This iron skin 23 was placed vertically on the iron skin 26 as shown in FIG. 12, and refractory bricks 16, supporting refractory bricks 17, and ceramic partition plates 18 were constructed in the structure shown in FIG.

Construction was carried out by dividing the 2m-high steel skin into five stages. The construction order is that the inner refractory bricks 16 and the support refractory bricks 17 are first constructed in a circular shape with a predetermined glue on the basis of the retainer 15, and then
The ceramic partition plate 18 was fitted into a predetermined groove 27 of the supporting refractory brick 17 from above and fixed. This makes it possible to construct a double-layered lining. In this case, it is impossible to support the ceramic partition plate unless the dimensions of the support bricks are precisely completed. According to the hydraulic method, the support bricks 17 are not rotated vertically during construction, so construction can be performed with high precision. The state after construction is completed is 13th.
As shown in the figure.

In this way, six sets of split furnace bodies 23 having six combustion chambers 13 and capable of indirectly heating the furnace core chamber 19 were constructed.

These six sets of divided furnace bodies 23 were connected by flanges by inserting ceramic fiber backings into their respective joint surfaces 24 to create an externally heated rotary furnace body having a total length of 12 m.

In this embodiment, there are six combustion chambers, a hexagonal furnace core chamber, and six retainers, but any number can be used depending on the size of the furnace body.

〔Effect of the invention〕

According to the method of the present invention, it is possible to construct a refractory lining having a multilayer structure, which could not be constructed using conventional construction methods.

[Brief explanation of the drawing]

Figure 1 is a sectional view parallel to the rotation axis showing an example of the internal heating rotary furnace body, Figure 2 is a sectional view perpendicular to the rotation axis showing an example of internal heating rotary furnace refractory construction, and Figure 3. 1 is a sectional view parallel to the rotation axis showing an example of an external heating rotary furnace body, FIG. 4 is a sectional view perpendicular to the rotation axis showing an example of external heating rotary furnace refractory construction, and FIGS. 5 to 10 The figure is an explanatory diagram showing the construction procedure for the refractory lining of an internally heated rotary furnace, FIG. 11 is a perspective view showing an embodiment of the outer shell of an externally heated rotary furnace according to the present invention, and FIG. FIG. 13 is a perspective view showing an embodiment of a split shell of a thermal rotary furnace, and FIG. 13 is a perspective view showing an embodiment after completion of construction of the refractory lining in the external heating rotary furnace according to the present invention. Wan 11th District %12 Map

Claims (1)

[Claims] The cylindrical furnace shell is divided in the axial direction, the furnace shell with flanges arranged at both ends is placed upright, and a lining refractory is installed inside, and then the furnace bodies are connected and a long A method of constructing an external heating rotary furnace characterized by obtaining a furnace body.