JPS605875B2 - Industrial kiln ceiling structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceiling structure for an industrial kiln having a dome shape, such as an arc furnace, a refining furnace, and a heating furnace.

Since the dome-shaped ceiling structure of conventional industrial furnaces is constructed of bricks except for the outer frame, wear and tear on some of the bricks affects the lifespan of the entire ceiling.

In addition, recently, a completely water-cooled structure has been known, but it is not economical due to large heat loss, and is also heavy, so it cannot be used if there is a ceiling weight limit. In addition to the outer frame, the present invention provides an intermediate frame with a water-cooled structure and an inner frame with a water-cooled structure, and by constructing a refractory material between these frames, the life of the ceiling is lengthened, and the ceiling structure is weighted down. An embodiment thereof will be described with reference to the drawings.

In FIGS. 1 and 2, 1 is a metal inner frame, 2 is a metal intermediate frame, and 3 is a metal outer frame. That is, an intermediate frame 2 and an inner frame having the same D circle as this frame 3 are provided inside an outer frame 3 provided in an annular shape, and a refractory material 4 such as brick, plastic, or cast double is provided between these three frames. Build. In order to prevent the inner frame 1 and the intermediate frame 2 from falling off, the inner frame 1 and the intermediate frame 2 are connected by hardware including a hanging bolt 7 suspended from a hanging frame 6 installed on the upper part of the outer frame 3. Further, the inner frame 1 has a Y-shaped reinforcing metal fitting 8 inside the annular shape, and a refractory material 4 built inside the annular inside of the frame 1.
are dividedly supported by the reinforcing hardware 8. Note that the reference numeral 5 in FIG. 2 indicates an anchor. In addition, the inner frame, the intermediate frame 2, and the outer frame 3,
Together with the refractory material 4, it constitutes a dome-shaped ceiling structure. The inner frame and the intermediate frame 2 have almost the same structure and differ only in diameter, so they are designated as frame a and their details are shown in FIG. 3.

That is, the cross section of the frame a has a taper that widens toward the inside of the furnace (the lower surface of the frame a), and inside the frame a there are cooling water passages e and d divided into upper and lower sections.
The passage cross-sectional area of the lower cooling water passage d is the upper cooling water passage e.
In other words, the flow velocity of the cooling water flowing through the passage d is larger than the flow velocity of the cooling water flowing through the passage e. Therefore, the water supply system of the upper and lower cooling water The upper and lower drainage systems are the same. Also, on the lower surface of the frame a, an anchor c (same as the anchor 5 shown in Fig. 2) is used to construct a monolithic refractory material b such as plastic or cast double.
is installed. Note that the symbol f in FIG. 3 indicates a pin for preventing the frame from falling off. FIG. 4 shows another embodiment of the present invention corresponding to FIG. 3. Since the case of this FIG. 4 is not much different from the case of FIG. 3, the same parts are given the same reference numerals. There is.

That is, a rib g is attached to the lower surface of the frame a in place of the anchor c, and by doing so, the presence of the rib g prevents the frame a from being fixed during use.
The slag h tends to adhere to the lower surface of the slag h'
It will play the same role as refractory b in Figure 3. Therefore, the present invention provides, in addition to a metal outer frame,
It has a metal intermediate frame and a metal inner frame, so it has great strength, and the intermediate frame and inner frame have cooling water passages, so they are properly cooled and do not overheat and burn out. Since refractories are constructed between each frame, there is no excessive weight and heat loss as in the case of full-surface cooling, and the heat loss is lower than that of ordinary brickwork. hardly increases.
Furthermore, since it is a combination of a mizuban type frame and a refractory material, partial burnout and abrasion of the bricks can be eliminated. especially,
The central part of the ceiling, which is particularly prone to damage, is equipped with a Y-shaped reinforcing metal piece that divides and supports the refractory material in that area.This reinforcing metal piece not only provides reinforcement, but also provides cooling, thus extending its service life. can be made significantly longer, and if damaged, parts can be easily and quickly replaced. In addition, since the cross sections of the intermediate frame and the inner frame have a taper that widens toward the inside of the furnace, there is no need for irregularly shaped bricks as refractories, and bricks of the same shape and size can be used for bricklaying. Even when natural bricks are used, complicated hanging hardware such as a sluice is not required. Furthermore, since the cooling water passages in the intermediate frame and inner frame are divided into upper and lower sections, the flow rates and flow speeds of the upper and lower cooling water can be controlled separately for cooling. Since the passage cross-sectional area of the cooling water is made smaller than the passage cross-sectional area of the upper cooling water, the flow velocity of the lower cooling water on the high temperature side is higher than the flow velocity of the upper cooling water, so that the above-mentioned upper and lower cooling water supply systems Also, since the upper and lower drainage systems can be installed in the same system, the equipment cost for the cooling water gun can be significantly reduced. In addition, if protrusions such as anchors or ribs are provided at the lower part of the intermediate frame and the inner frame, that is, on the high heat load side (inside the furnace), it will be easier to construct monolithic refractories or attach slag, and therefore the intermediate Overheating and burnout of the frame and inner frame is avoided, extending the service life.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the first embodiment of the present invention, Fig. 2 is a longitudinal sectional view taken along the cutting line A-A in Fig. 1, and Fig. 3 shows the intermediate frame and inner frame in Fig. FIG. 4 is a perspective view of a second embodiment of the present invention corresponding to FIG. 3; 1...Inner frame, 2...Intermediate frame, 3...
... Outer frame, 4... Refractory, 5... Anchor, 6... Hanging frame, 7... Hanging bolt, 8...
・・Reinforcement metal fittings, a……Frame, b・・・Unshaped refractories, c・・・Anchors, d・・・Lower cooling water passage, e…… Upper cooling water passage , f...pin for preventing frame from falling off, g...rib, h...slug. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A metal outer frame provided in an annular shape on the outside, a metal intermediate frame provided concentrically inside the outer frame, and a metal intermediate frame provided concentrically inside the intermediate frame. A metal inner frame provided, a refractory provided between each of these frames and inside the annular shape of the inner frame, and a refractory provided inside the annular shape of the inner frame to support the refractories in that part separately. It consists of a dome-shaped ceiling structure with a Y-shaped reinforcing metal fitting, and the cross section of the intermediate frame and the inner frame has a taper that spreads toward the inside of the furnace, and inside there is cooling water divided into upper and lower parts. A ceiling structure for an industrial kiln, having a passageway for an industrial kiln, and a passageway cross-sectional area of the lower cooling water of the intermediate frame and the inner frame is smaller than a passageway cross-sectional area of the upper cooling water. 2 A metal outer frame provided in an annular shape on the outside, a metal intermediate frame provided concentrically inside this outer frame, and a metal frame provided concentrically inside this intermediate frame. An inner frame, a refractory provided between each of these frames and inside the annular shape of the inner frame, and a Y-shaped refractory provided inside the annular shape of the inner frame to divide and support the refractories in that part. It consists of a dome-shaped ceiling structure equipped with reinforcing metal fittings, and the cross section of the intermediate frame and the inner frame described separately has a taper that spreads toward the inside of the furnace, and the inside has a cooling water passage divided into upper and lower parts, Moreover, the passage cross-sectional area of the lower cooling water of the intermediate frame and the inner frame is made smaller than the passage cross-sectional area of the upper cooling water, so that the upper and lower cooling water supply systems and drainage systems are the same system, and . A ceiling structure for an industrial kiln, comprising protrusions such as anchors or ribs at lower portions of the intermediate frame and the inner frame.