JPH087029B2 - Structure of water-cooled through hole in combustion furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion chamber of a boiler, a melting furnace, a roasting furnace, or the like, and a peephole, an inspection hole, which penetrates the furnace wall and reaches the inside of the high-temperature furnace. The present invention relates to the structure of through holes such as measurement holes or burner holes.

[Prior Art] FIG. 4 is a cross-sectional view showing an example of a through hole in a combustion furnace or the like in the prior art.

There is a through hole 21 that connects an extremely high-temperature furnace interior 25 and a room-temperature furnace exterior 26 to each other, and a peripheral wall water-cooling jacket 22 structure having a high heat insulating effect is provided on the peripheral wall side of the furnace exterior 26. A refractory material 23 supported by studs 24 welded to the peripheral wall water cooling jacket 22 is stretched over the entire surface of the peripheral wall inside the furnace 25 to maintain the temperature inside the furnace.

The through hole 21 of the structure is capable of maintaining a high temperature without lowering the temperature inside the furnace by extending the refractory 23, and the outer surface is covered by the peripheral wall water cooling jacket 22. It is a through-hole structure having a sufficient heat insulating effect.

[Problems to be Solved by the Invention] However, in the structure of the through hole of the above-mentioned conventional technique, when the temperature in the furnace 25 is high, for example, in the cyclone coal combustion furnace, the temperature in the furnace is the melting temperature of the pulverized coal combustion ash. If the temperature is higher than that, the combustion ash in a molten state that has flown to the surface of the refractory whose surface temperature is rising due to contact with radiant heat and high-temperature gas is welded to the surface of the refractory 23 without being rapidly cooled. .

The molten ash deposited is a refractory material between the peripheral wall water cooling jacket
23 intervenes and prevents rapid cooling from being carried out, so that solidification due to cooling, sticking to the inside of the furnace one after another without dropping off, repeating growth, and finally closing the through hole 21 It was something that had.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a structure of a through hole that does not impair its original function due to blockage due to adhesion and growth of molten ash with an extremely simple structure. There is.

[Means for Solving Problems] The above object is achieved by the structure of the water-cooled through hole of the combustion furnace described in the claims. In other words, a small-diameter water-cooled structure such as a peephole that penetrates through the furnace wall from the outer wall side to the inner wall side of a combustion furnace in which refractory is pasted on the entire inner surface of the furnace that burns or melts in the furnace A structure of a water-cooled through-hole of a combustion furnace that forms a water-cooled wall structure in which a continuous water-cooled wall surface is directly exposed from the inner surface of the through-hole at the peripheral edge of the through-hole of the inner wall of the furnace where the through-hole opens Is.

[Operation] When a through-hole having the above-described configuration is attached to a cyclone coal combustion furnace, the ash of pulverized coal that has flown onto the surface of the refractory in the inner wall of the furnace where the refractory is stuck is The molten ash of pulverized coal that flew to the water cooling wall structure formed on the furnace inner wall side along the furnace inner opening end of the through-hole collided with the water cooling wall structure, though it repeatedly adhered and grew inside the furnace one after another. When they come into contact with each other, they are cooled and solidified in an extremely short time, so that they drop immediately without adhering to and growing near the opening inside the furnace of the through hole.

As a result, the opening of the through-hole inside the furnace can always maintain its original shape, thereby maintaining the original function such as sufficient visibility.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 is a side sectional view of a cyclone coal combustion furnace, FIG. 2 is a sectional view taken along the line aa of FIG. 1, and FIG. 3 is a detailed view of a portion b of FIG. 1-3, 1 is a cyclone coal combustion furnace, 2 is a primary air and pulverized coal feed hole, 3 is a secondary air feed hole, 4 and 5 are through holes, 6 is a peripheral wall water cooling jacket, and 7 is Furnace wall water cooling jacket, 8 peripheral wall cooling water inlet pipe, 9 peripheral wall cooling water outlet pipe, 10 furnace wall cooling water inlet pipe, 11 furnace wall cooling water outlet pipe, 12 refractory material, 13 inside furnace, 14 Is outside the furnace.

When pulverized coal is burned in the combustion chamber and the melting temperature of the combustion ash of the pulverized coal is extremely low, the combustion ash is scattered in the normal combustion chamber in a cyclone coal combustion furnace. When high temperature and high heat load combustion is performed at
Even if the combustion ash has a high melting temperature, the combustion ash is in a molten state and scattered.

Of the scattered molten combustion ash that reaches the refractory 12 attached to the peripheral wall of the combustion chamber, the refractory 12 is in a high temperature state due to contact with radiant heat from the pulverized coal combustion flame and combustion gas. It adheres in the molten state without being cooled.

The outer side 14 of the refractory 12 is in contact with the peripheral wall water-cooling jacket 6, so that combustion ash in a molten state adheres to the refractory 12 and repeatedly burns to increase the thickness of the refractory 12 inside the furnace. The combustion ash is gradually cooled from the peripheral wall jacket 6 side and begins to adhere to it, whereby the adhesion and growth of the molten ash in the refractory 12 inside the furnace further continue.

On the other hand, in the surface of the peripheral wall water cooling jacket 6 or the furnace wall water cooling jacket 7 formed by exposing the through holes 4 and 5 inside the furnace in the present invention, cooling water always flows in and out of the jacket. Thus, it is possible to maintain the temperature close to the temperature of the cooling water.

In FIG. 3, the through hole 4 is formed by forming the water cooling jacket exposed in the furnace 13 with the same member as the peripheral wall water cooling jacket 6, and the through hole 5 is independent of the water cooling jacket exposed in the furnace 13. Although it is formed by the water cooling jacket 7 of the furnace wall of the cooling system, in any case, the molten ash in contact with the surface of the cooling wall exposed in the furnace 13 is cooled and solidified in an extremely short time. Unlike the case of the refractory material 12 described above, the surface of the water cooling jacket 6 or 7 exposed in the furnace 13 is always kept clean by falling off.

The shape of the water cooling wall structure exposed at the peripheral edge of the opening of the through hole 5 on the inner wall side of the furnace is not particularly limited as long as the molten ash in a molten state is cooled by contact and solidifies and drops off reliably. However, particularly good results are obtained in the case of the arc shape as shown in FIG.

[Effects of the Invention] As described in detail in the above embodiments, in the combustion furnace in which combustion, melting, and the like are performed in the furnace, the invention of the present application has a through hole on the furnace inner wall side adjacent to the boundary portion between the through hole and the furnace inner wall. By forming a water-cooling wall structure that directly exposes the water-cooling wall surface that is continuous from the inner surface of the through hole along the opening end on the furnace inner wall side, molten ash adheres and grows to form a peephole, inspection hole, measurement hole or It is possible to prevent an inconvenience such as a failure such that the through hole such as the burner hole is blocked or shielded and cannot fulfill its function.

[Brief description of drawings]

FIG. 1 is a side sectional view of a cyclone coal combustion furnace used for carrying out the present invention, FIG. 2 is a sectional view taken along the line aa of FIG. 1, and FIG. 3 is a detailed view of a portion b of FIG. It is a figure which shows an example. FIG. 4 is a diagram showing an example of a conventional technique. 1 ... Cyclone coal combustion furnace, 2 ... Primary air and pulverized coal feed hole, 3 ... Secondary air feed hole, 4,5 ... Through hole, 6 ... Perimeter wall water cooling jacket, 7 ... Reactor wall water cooling jacket, 8 ... Peripheral wall cooling water inlet pipe, 9 ... Peripheral wall cooling water outlet pipe, 10 ... Reactor wall cooling water inlet pipe, 11 ... Reactor wall cooling water outlet pipe, 12 ... Refractory material, 13 ... Reactor inside,
14 ... Outside the furnace, 21 ... Through hole, 22 ... Perimeter wall water cooling jacket, 23 ...
Refractory, 24 ... Stud, 25 ... Inside furnace, 26 ... Outside furnace.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuhei Nozoe 2-4-25 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd., Tokyo Design Office (56) References: 59-120900 ) Actual development Sho 51-153704 (JP, U) Actual public Sho 62-27839 (JP, Y2)

Claims (1)

[Claims] 1. A small-diameter window, such as a peephole, which penetrates the furnace wall from the outer wall side to the inner wall side of a combustion furnace in which a refractory material is stuck on the entire inner surface of the furnace, which burns or melts in the furnace. Combustion characterized by forming a water-cooled wall structure that directly exposes a continuous water-cooled wall surface from the inner surface of the through-hole at the peripheral edge of the through-hole of the furnace inner wall where the through-hole opens Structure of water-cooled through-hole of furnace.