JPH086912B2 - Vertical melting furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vertical melting furnace such as a metal melting furnace for heating and melting, by coke, incineration ash of solid combustible materials such as municipal waste and coal. Is.

(Prior Art and Problems Thereof) In the conventional vertical melting furnace, there is a water-cooled type only in the peripheral wall portion of the lower part from the tuyere, but a water-cooled type in the furnace bottom is Absent. This is because if the bottom of the furnace is water-cooled in the usual way, the molten slag will be cooled more than necessary and the fluidity will not be significantly lost, and there is a great possibility that slag outside the furnace will be impossible. This is because. Therefore, conventionally, it is usual to protect the bottom of the furnace with a refractory coating.

However, this coated refractory is greatly damaged by the reaction with the molten slag and needs to be refilled regularly.
There are problems that the maintenance cost is high and the operating rate is low.

The present invention aims to solve the above problems.

(Means for Solving Problems) The structure of the present invention will be described with reference to the drawings corresponding to the embodiments. According to the present invention, the furnace bottom portion 2 inclined to the outlet 1 side is provided with a peripheral wall portion 3 above the furnace bottom portion 2. And the cooling water 4 can be filled with the cooling water 4 and the cooling water introduction part 5 is provided on the upper side of the furnace bottom 2.
And a bypass circulation means 6 for the cooling water 4 from the introduction part 5 to the outlet 1 side, and the cooling water introduction part 5 is provided.
The cooling water lead-out portion 7 is formed on the peripheral wall portion 3 above the.

Here, as shown in FIG. 2, the detour circulation means 6 is constituted by a cooling water pipe 8 arranged along the inner circumference of the furnace bottom part 2 from the cooling water introduction part 5 to the outlet 1 side, As shown in FIG. 3, a cooling water pipe 9 is arranged in a meandering manner from the cooling water introduction part 5 to the outlet 1 side, or as shown in FIG. 4, it faces the cooling water introduction part 5. Any structure may be used as long as the flow of the cooling water 4 from the cooling water introduction part 5 to the outlet 1 side is bypassed, such as a structure including a plurality of baffle plates 10 arranged in parallel.

(Operation) In the above-mentioned configuration, the cooling water 4 introduced from the cooling water introduction part 5 fills the hollow furnace bottom part 2 and the peripheral wall part 3 at the upper part thereof to cool them, and It rises and is led out from the cooling water outlet 7. At this time, the cooling water 4 introduced from the introduction part 5 flows to the outlet port 1 side through the bypass circulation device 6, so that the bypass water circulation device 6 is distributed before reaching the outlet port 1 side. When heated, the temperature rises due to heating. In this way, the cooling water 4 is supplied to the outlet port 1 side while the temperature has risen to some extent, so that the outlet port 3 side is not cooled more than necessary, so that the molten slag will not be cooled by the molten slag. It is possible to prevent the slag from coming out of the mouth 3.

In particular, in the embodiment in which the bypass flow means 6 is constituted by a cooling water pipe 8 arranged along the inner circumference of the furnace bottom 2 from the cooling water introduction part 5 to the outlet 1 side as shown in FIG. However,
The flow of the cooling water 4 introduced from the cooling water introduction part 5 is 2 in the figure.
As shown by the dashed line, that is, the cooling water 4 flows from the introduction part 5 to the outlet 1 side via the bypass flow means 6 and then returns to the introduction part 5 side via the center side of the furnace bottom part 2. It becomes a flow. Therefore, the cooling water 4 is supplied by the bypass flow means 6 to the outlet 1 side when the temperature has risen to some extent, and is supplied to the center side of the furnace bottom 2 when the temperature has further risen. Therefore, it is possible to effectively prevent the supercooling of the molten slag in the center side together with the outlet 1 side,
In this way, the fluidity of the molten slag that has reached the furnace bottom portion 2 can be effectively maintained, and the slag can be discharged to the outside of the furnace more smoothly.

(Example) Next, the Example shown in a figure is demonstrated.

FIG. 1 shows an embodiment of the overall configuration of a vertical metal melting furnace to which the present invention is applied, where reference numeral 11 is a furnace body, 12 is a tuyere,
13 is a cover for preventing the molten slag from scattering, 14 is a slag cooling water tank, and 15 is a raw material charging damper. In this embodiment, the cooling section boundary 16 of the peripheral wall section 3 is provided below the tuyere section 12, and the cooling water introduction section 5 and the cooling water derivation section 7 of different systems are provided in each cooling section. ing. By appropriately setting the cooling sections of the furnace bottom portion 2 and the peripheral wall portion 3 in this manner, it is possible to appropriately cool them.

(Effects of the Invention) As described above, the present invention is configured such that the cooling water introduced from the cooling water introduction part flows to the outlet side through the bypass flow means, instead of simply using the water cooling type furnace bottom part. Since it is a water-cooled type, there is an effect that the molten slag on the outlet side is not cooled more than necessary and the molten slag can always be smoothly discharged. In particular, depending on the configuration of the bypass flow means, there is an effect that both the outlet side and the center side of the furnace bottom can be cooled more appropriately, and thus the molten slag can be discharged more smoothly.
Thus, the present invention can realize a water-cooled furnace bottom portion in a vertical melting furnace, and has an effect that it is more economical than a conventional furnace bottom portion coated with refractory.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view showing an embodiment of the overall configuration of a vertical metal melting furnace to which the present invention is applied, FIGS. 2 (a), (b), and 3
4 (a) and 4 (b) and FIGS. 4 (a) and 4 (b) show an embodiment of a main part, wherein (a) is a longitudinal explanatory view and (b) is XX line and Y line, respectively. It is a Y-line and ZZ line cross-section explanatory drawing. Reference numeral 1 ... slag outlet, 2 ... furnace bottom, 3 ... peripheral wall, 4 ...
… Cooling water, 5 …… Cooling water introduction part, 6 …… Bypass distribution means,
7 ... Cooling water outlet, 8, 9 ... Cooling water pipe, 10 ... Baffle plate, 11 ... Furnace body, 12 ... Tuyere, 13 ... Scatter prevention cover, 14 ... Slag cooling water tank, 15 …… Raw material charging damper, 16 …… Boundary.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F23G 5/24 ZAB B

Claims (4)

[Claims] 1. A furnace bottom portion inclined to a slag outlet side is made hollow along with an upper peripheral wall portion thereof so as to be capable of being filled with cooling water, and a cooling water introducing portion is arranged on an upper side of the furnace bottom portion. At the same time, the melting furnace comprises a bypass circulation means for cooling water from the introduction portion to the outlet side, and a cooling water outlet portion on the peripheral wall portion above the cooling water introduction portion. 2. The detour circulation means is constituted by a cooling water pipe arranged along the inner circumference of the bottom of the furnace from the cooling water introduction part to the outlet side, and the detour circulation means is characterized in that: Vertical melting furnace. 3. The vertical melting furnace according to claim 1, wherein the detour circulation means is constituted by a cooling water pipe arranged in a meandering manner from the cooling water introducing portion to the outlet side. . 4. The vertical melting furnace according to claim 1, wherein the bypass flow means is constituted by a plurality of baffle plates arranged so as to face the cooling water introducing portion.