JPS5866708A - Shaping device for underflame - Google Patents

Abstract

PURPOSE:To increase the capacity of a kiln to load a burned product, by transforming a flame, injected from a burner, into a flat flame pattern, by providing a flame shaping and flame leading port to a burner equipped to a tunnel kiln. CONSTITUTION:A burner flame, injected into the inlet port 23 of a flame pattern transforming and flame leading hole 22 provided to a refractory block 21, from a high speed bar type burner 10, is led into a small gap 16 above a trolley 11, after hitting against the lower half of a wall 24 and the upper half of a wall 25 both of which are extended to a flat sectional end 26, and being transformed into a flat and modified flame pattern in a flame discharging port 27. The flames, entered into the small gap 16, heat the under side of a shelf plate 15 to perform vitrification of the material 17. With such an arrangement, a capacity to load the burned material 17 is increased, because it is not necessary to take the height for the small gap 16 on the side of a trolley 11. In addition, the combustion efficiency of a kiln can be greatly increased, because it is not necessary to build the ceiling of a kiln high.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a small space between the white surface of a cart moving in a tunnel kiln and a shelf plate on which the material to be fired is mounted, and a burner provided along the side wall of the tunnel kiln. The underframe shaping device injects the injected burner flame within the above-mentioned small interval to perform fuel-efficient firing by so-called underframe heating, and includes several pieces installed on the front side of the burner of a tunnel kiln. A refractory block consisting of
The inlet hole has a circular or elliptical cross section from which the burner flame is injected into the center, and the lower and upper half walls of the inlet hole are extended to form a flat cross section about the horizontal inner diameter of the inlet hole. The present invention is characterized in that a gas flame deformation guide hole is provided, which forms a flame discharge hole having a horizontally long and flat shape approximately the same as the inner diameter, and continues from the end of the flat cross section.

The burner flames emitted from the numerous burners installed along the side walls of the tunnel kiln are spindle-shaped as shown in Figure 1, and the flames eject from the side walls of the objects to be fired, which are piled up on a cart that moves inside the tunnel kiln. The temperature of the heating atmosphere in the tunnel kiln heating zone is maintained at a predetermined temperature because the burner flame is applied to the surface of the tunnel kiln. It's not very efficient. For this reason, as shown in Fig. 2, the shelf board C is supported by fireproof block pillars at a considerable distance from the top of the platform of the truck a, and a gap S is formed between the platform and the bottom surface of the shelf.
In some cases, a so-called under-frame heating method is adopted in which burner flame F is injected almost horizontally into the gap S to heat the material d placed on a shelf. As mentioned above, it has a spindle shape, so
The burner flame P cannot be injected unless the height of the gap S is made considerably large, and for this reason, the height of the inner space of the tunnel kiln must be increased, or the loading volume of the materials to be fired per truck must be increased. You will have to make sacrifices.

The present invention uses such an underframe heating method to significantly reduce the height of the gap, and to obtain a sufficient loading capacity for the materials to be fired per cart without substantially increasing the height of the tunnel kiln interior. To provide an underframe shaping device that flattens the burner flame injected from the burner in order to improve the fuel efficiency.

Fig. 3 shows a tunnel kiln l equipped with the underframe shaping device of the present invention, in which the tunnel kiln l is constructed within the outer shell protection frame j using side wall refractory bricks 2, - and ceiling wall refractory bricks 3, etc. A rail 6 is laid at the bottom of the empty space S, and sealing sand is packed between the partition plate 7 on both sides and the lower inner surface of the side wall refractory brick 2, and insulation plates are installed at both ends of the trolley/l that moves the rail 6''2. 12
At the same time, holes for a high-speed rod-shaped burner IO whose injection port is almost aligned with the base surface 13 of the truck 1/ by the side wall refractory bricks 2 are provided at appropriate intervals, and on the inner surface thereof, A support surface 9 is provided by stacking side wall refractory bricks 2.

A low-height fireproof block/
4' and place a fireproof shelf board on top of it, a small flat space 16 with a height of 30 to 30111M is constructed between the white surface 13 and the bottom surface of the shelf board IS, and The material to be fired 17 is placed on the tower.

2/ is a monolithic refractory block installed on the white surface 13 in front of the flame spout of the high-speed rod-shaped burner 10,
As shown in FIGS. tI to 7, an inlet hole 23 with a circular (or elliptical) cross section is provided on the surface corresponding to the burner 10, and the burner flame jetted from the flame spout is jetted into the center thereof;
The lower half wall 2t and upper half wall 2S of the inlet hole are extended to form a flat cross section that is slightly narrower than the internal diameter value of the inlet hole 23 in the horizontal and horizontal directions, and the flat cross section end 2B is continued. In addition, a horizontally long and flat flame discharge hole 27 is provided on both sides, slightly larger than the horizontal inner diameter of the flat cross-sectional end 2B, but slightly narrower than the inner diameter of the inlet hole 3. Form a flame deformation induction hole. In the above, the height H1 width W1 and length L of the refractory block 21 are /30X20
0×/! When the inlet hole 3 is circular, the inner diameter is about /JOfl, and the inlet hole 2
The length L' from 3 to the flat cross section end 26 is 72 J 11
1111, and the width W' of the cross-sectional end 2 is royt.
tta, and the height H' is approximately /2MM. The length Lo of the flame discharge hole 27 is about jiff, and the height H" is the cross-sectional end 2.
The width of the open end W" is about the same as the height H' of B/jff, and the width of the open end is 1
The distance should be approximately 00m. The centers of the flat cross-sectional end 26 and the flame discharge hole 27 are aligned with the center of the inlet hole 23.

The refractory block 21 illustrated above has a distance 2 of about 5 otxx between the flame spout of the burner 10 and the inlet hole 23.
Place r and fix it on the platform 13, and connect the flame discharge hole 27 at a small interval on the white surface 13 of the truck 1/! The distance is about 1008.

The burner flame injected from the high-speed rod-shaped burner 10 into the inlet hole 23 of the flame deformation induction hole 2- of the refractory block J/ has a diameter of 20 mm, unlike the spindle-shaped injection flame of a normal burner.
The lower half wall 2t is shaped like a circular rod with a diameter of ~30 mm, but does not expand laterally, and extends toward the flat cross-section edge JA.
and 2-half wall 2S, and both walls, 2#,...
2J sequentially approaches the end rollers of the flat cross-section to narrow the cross-sectional area, causing deformation of the flat shape, maintaining the flat shaped shape in the flame discharge hole 27, and spraying the flame within the small interval lt of the bogie II. , the lower surface of the shelf board/3 is heated within the small interval 16, and the object to be fired 17 is guided to the firing state.

The existence of the distance 2r causes a part of the heated air from the furnace ceiling and other parts to be sucked by the flat venturi effect of the flame deformation guide hole λ, and the temperature of the burner flame is slightly lowered. Since the heated atmosphere is circulated in an agitated manner, it is more effective than the conventional case in which circulation is caused only by the jet action of the burner flame.

The underframe shaping device of the present invention has a small height that is constructed between the front side of a burner provided along the side wall of a tunnel kiln and a shelf board on the upper surface of the platform of a cart that moves inside the tunnel kiln. A spindle-shaped burner flame is installed between the burner and the horizontal direction, and the burner flame is shaped into a flat shape and directed at the small interval of slight height, and the flame is spread horizontally to spread out the shelf board. This allows the lower surface etc. to be directly heated by the flat flame, and there is no need to increase the height of small intervals on the cart side, so the loading volume of the objects to be fired can be reduced.
This increases compared to the conventional underframe heating method illustrated in Figure 2, and on the tunnel kiln side, the ceiling is not raised and the heating efficiency is not degraded, but the fuel efficiency when using the underframe heating method is significantly improved. It is an inventive step that can be improved.

[Brief explanation of drawings]

Fig. 1 is a side view showing an aspect of the burner flame, Fig. 2 is a front view illustrating a conventional underframe heating method, and Fig. 3 is a front view of an underframe heating method using the underframe shaping device of the present invention. Figures 1 to 7 show the device of the present invention, in which Figure 1 is a cross-sectional plan view of the center, Figure S is a longitudinal cross-sectional side view of the center, Figure 6 is a rear view, and Figure 7 is a cross-sectional view of the center. It is a front view. l→tunnel kiln, 10→burner, //→cart, 13→
Base surface, ts → fireproof shelf board, /4 → small interval, 21 → person-resistant block, 22 → flame deformation guide hole, 23 → entrance hole, 211
→Lower half wall, 2j→Upper half wall, 26-Flat section end, 27→Flame discharge hole Fig. 1 Fig. 2Fm Hiada Fig. 12 7 6 71211 9

Claims (1)

[Claims] A refractory block consisting of one or more pieces installed in front of the burner of a tunnel kiln has an inlet hole with a circular or oval cross section through which the burner flame is injected into the center, and a lower half wall and an upper half wall of the inlet hole. A burner flame deformation inducing hole is provided which is extended and deformed to form a flat cross-section about the horizontal inner diameter of the artificial hole, and continues to the end of the flat cross-section and forms a flat discharge hole whose horizontal length is about the inner diameter. An under frame shaping device.