JPH01111191A - Structure of water-cooling type through-hole of combustion furnace - Google Patents

Abstract

PURPOSE: To always keep the furnace interior side of a through hole clean by building a part facing the interior of the furnace of a hole piercing a furnace wall in a water-cooled structure. CONSTITUTION: The surface of a water-cooled jacket 6 or 7 formed being exposed to the furnace interior 13 side of through holes 4 and 5 can maintain the temperature thereof almost equal to the temperature of cooling water as the cooling water constantly flows into or out of the jacket. The through hole 4 is formed out of a water-cooled jacket which is exposed to the interior 13 of the furnace and made up of a member common to a surrounding wall water- cooled jacket 6 and the through hole 5 is formed out of a water-cooled jacket which is exposed to the interior 13 of the furnace and made up of a furnace wall water cooled jacket 7 in an independent cooling system. In any case, melted combustion ash contacting the surface of a cooling wall exposed to the interior 13 of the furnace is cooled, coagulated and dropped in a very short time thereby always keeping the surface of the water-cooled jacket 6 or 7 exposed to the interior 13 of the furnace clean.

Description

[Detailed Description of the Invention] [Industrial Fields of Application] The present invention is directed to the combustion chamber of a boiler, melting furnace, roasting furnace, etc., in which a viewing window, an inspection hole,
It relates to the structure of through holes such as measurement holes or burner holes.

[Prior Art] FIG. 4 is a cross-sectional view of an example of a through hole in a conventional combustion furnace. There is a through hole 21 that communicates between the inside 25 of the furnace, which is at a very high temperature, and the outside 26, which is at room temperature. A refractory 23 supported by studs 24 welded to the peripheral wall water cooling jacket 22 is stretched over the entire surface of the peripheral wall on the furnace interior 25 side in order to maintain the temperature inside the furnace. The through hole 21 of this structure is
It is possible to maintain a high temperature without lowering the temperature inside the furnace by the refractory material 23, and the through-hole structure has a high thermal efficiency and has a sufficient heat insulation effect because the outer surface is covered by the peripheral wall water cooling jacket 22. It is.

[Problems to be Solved by the Invention] However, with the above conventional through-hole structure, when the temperature inside the furnace 25 is high, for example in a cyclone coal combustion furnace, the temperature inside the furnace is higher than the melting temperature of pulverized coal combustion ash. If the temperature is high, the combustion ash that flies to the surface of the refractory 23 whose surface temperature has increased due to radiant heat and contact with high-temperature gas, adheres to it, and melts, is not cooled rapidly and is Weld. The welded molten ash is interposed between the surrounding wall water cooling jacket and the refractory material 23, which prevents rapid cooling, so that the welded molten ash flows inside the furnace one after another without solidifying or falling off due to cooling in a short period of time. The problem was that the particles repeatedly adhered and grew, and eventually clogged the through hole 21.

[Means for solving the problem] As described in the above claims, the means for solving the above problem is that in a combustion furnace in which combustion and melting are performed, holes penetrating the furnace wall are provided. This is the structure of a water-cooled through-hole in a combustion furnace where the part facing the inside of the furnace is water-cooled.

[Function] When a cyclone coal combustion furnace is provided with a through hole of the above configuration, the molten ash of pulverized coal that flies onto the surface of the refractory material on the inner peripheral wall of the furnace repeatedly adheres and grows on the inside of the furnace, but does not penetrate through the furnace. When the pulverized coal ash that has flown to the furnace wall water-cooling jacket, which is formed in the part of the hole facing the furnace interior, comes into contact with the surface of the furnace wall water-cooling jacket, it is cooled in an extremely short period of time and immediately solidifies. Then, it peels off and falls off the surface of the reactor wall water cooling jacket. As a result, the inside of the furnace inside the through-hole is always maintained in a clean state, thereby making it possible to maintain its function.

[Example code] An embodiment of the present invention will be described below based on the drawings.

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

When pulverized coal is burned in a combustion chamber, if the type of coal has a very low melting temperature, the ash will be molten and scattered in a normal combustion chamber; Even if the type of coal has a high temperature, when high temperature and high heat load combustion is performed in a cyclone coal combustion furnace, the combustion ash becomes molten and scatters. The scattered molten combustion ash that reaches the refractory 12 on the peripheral wall of the combustion chamber is
Because it is in a high temperature state due to radiation from the pulverized coal combustion flame and contact with the combustion gas, it is not cooled and adheres in a molten state. Since the outside 14 side of the refractory 12 is in contact with the surrounding wall water cooling jacket 6, molten combustion ash adheres to it, and as it grows repeatedly and increases in thickness on the inside of the refractory 12, the molten combustion ash adheres to the inside of the refractory 12. is gradually cooled and begins to solidify from the side of the peripheral water cooling jacket 6, and as a result, the adhesion and growth of molten combustion ash on the inside of the furnace of the refractory 12 continues to progress. On the other hand, through holes 4 and 5
The surface of the water cooling jacket 6 or 7 formed to be exposed on the side of the furnace interior 13 can maintain a temperature close to that of the cooling water because cooling water is constantly flowing into and out of the jacket. In FIG. 3, the through hole 4 is formed by forming the water cooling jacket exposed to the inside of the furnace 13 from the same material as the surrounding wall water cooling jacket 6, and the through hole 5 is formed by making the water cooling jacket exposed to the inside of the furnace 3 independent. However, in either case, the molten combustion ash that came into contact with the surface of the cooling wall exposed inside the furnace 13 cooled and solidified in an extremely short period of time. However, unlike the case of the refractory 12 described above, the surface of the water cooling jacket 6 or 70 exposed to the inside of the furnace 13 is always kept clean.

[Effects of the Invention] As is clear from the above embodiments, the present invention provides combustion in a furnace,
In a combustion furnace that performs melting, by using a water-cooled structure for the part of the hole that passes through the furnace wall that faces the inside of the furnace, molten ash can adhere and grow and penetrate through the viewing window, inspection hole, measurement hole, burner hole, etc. This has the effect that the function of the hole is not deteriorated by blocking or closing the hole.

[Brief explanation of the drawing]

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 a-a in Fig. 1, and Fig. 3 is a detailed view of section b in Fig. 1 for carrying out the present invention. It is a figure which shows an example. FIG. 4 is an example of the prior art. 1...Cyclone coal combustion furnace, 2...Secondary air and pulverized coal inlet hole, 3...Secondary air passage large hole, 4.5...Through hole, 6...Peripheral wall water hole 7. Reactor wall water cooling jacket, 8. Surrounding wall cooling water pipe, 9. Surrounding wall cooling water outlet pipe, 10. Reactor wall cooling water pipe, 11. Reactor wall cooling. Water outlet pipe, 12... Refractory, 13... Furnace interior, 14
...Outside the furnace, 21...Through hole, 22.
・・Peripheral wall water cooling jacket, 23・・Refractory material, 24・・
・Stud, 25...Furnace, 26...
Outside the furnace. Jyo / Zuyoku 2 Zuyoku 4 Figure 3

Claims (1)

[Claims] A water-cooled through-hole structure for a combustion furnace in which combustion and melting are carried out in the furnace, characterized in that a portion of the hole penetrating the furnace wall facing the inside of the furnace has a water-cooled structure.