JP3498361B2 - Glass melting furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass melting furnace,
In particular, the adsorbability of dust or the like contained in the off gas discharged from the glass melting furnace is enhanced to facilitate the treatment of the waste gas, and at the same time, the cooling of the off gas discharge passage and the like is promoted.

[0002]

2. Description of the Related Art As a technical example for preventing dust and mist contained in off-gas in a glass melting furnace, Japanese Utility Model Laid-Open No. 146996/1987 "glass melting furnace" has been proposed. In this technical example, as shown in FIG. 2, the off-gas generated by melting the waste liquid and the glass material by the glass melting furnace 3 housed in the airtight chamber 2 of the cell 1 is sucked into the off-gas discharge pipe 4 and the off-gas suction pipe. The air curtain 6 is formed on the inner surface of the off-gas discharge pipe 4 to prevent dust and mist from adhering when the gas is sucked and discharged by the system 5.

As its specific structure, the technology shown in FIG. 3 has been introduced. In FIG. 3, reference numeral 10 is a melting furnace wall (glass melting furnace main body), 11 is a sleeve, 12 is an outer tube,
13 is an inner pipe, 14 is a deflector pipe (intermediate tube),
15 is a connecting plate, 16 is a slit, 17 is a suction port, 18
Is an introduction part, 19 is a ventilation hole, 20 is a ring plate, 21
Is an outer space, 22 is an inner space, 23 is a screw, G is an off gas, and S is an annular gap.

The off-gas generated inside the glass melting furnace 3 is sucked from the suction port 17 by the operation of the off-gas suction system 5 and discharged through the inner pipe 13. At that time, the outer space is discharged. 21 is blown into the inner tube 13 from the inner space 22 through the slits 16 into the inner tube 13 as indicated by the arrow to form the air curtain 6 on the inner surface of the inner tube 13 and the off-gas flow. The generation of dust and mist contained in G is suppressed. In addition, in the example of FIG. 3, air is ejected from the outer space 21 to the annular gap S via the vent hole 19 to prevent dust and the like from adhering to the inner surface of the introduction portion 18, Further, the ring plate 20 is designed so that it can be replaced with a screw 23 for detachability.

[0005]

However, even when these structures are adopted, the structure exposed inside the glass melting furnace 3 and the portion in contact with the off-gas flow G are exposed to a high temperature atmosphere. It requires cooling, but the outer tube 1
2. If it is attempted to effectively cool the inside of the inner pipe 13 and the deflector pipe 14 by using the air, the total amount of the off-gas flow G is significantly increased, which makes the treatment difficult.

The present invention has been made in view of the above circumstances and achieves the following objects. To facilitate the treatment of waste gas by enhancing the adsorptivity of dust contained in off-gas. Reduce the total amount of offgas. Effectively cool structures and piping exposed inside the glass melting furnace.

[0007]

In the glass melting furnace according to the present invention, an inner tube, an outer tube outside the inner tube, and further outside the inner tube
When an air curtain is formed in the inner tube of the off-gas discharge tube having the steam blow tube, the off-gas is inserted from the inner wall in a state of being isolated from the inner wall, A configuration including a steam blowing port arranged at an end portion of the pipe on the suction port side and a steam blowing unit that is connected to the steam blowing port and sends in steam is adopted. As a steam blowing means, a steam blowing pipe forming a steam blowing port,
A configuration including a water supply system connected to the steam blowing pipe and a steam plenum portion formed in a part of the steam blowing pipe to generate steam by absorbing heat from the glass melting furnace is adopted. As a steam blowing pipe, it is arranged in a penetrating state along the vertical direction on the ceiling wall of the glass melting furnace, and at the lower end of the steam blowing pipe, an annular recess for storing and evaporating water is provided. A configuration in which it is connected to the mouth is adopted. Between the end of the inner pipe on the suction port side and the steam blowing pipe, a technique for forming an annular slit-shaped steam blowing port and arranging an annular ring surrounding the inside of the annular recess is added. .
Therefore, it is possible to reduce the labor of the operator in the purging work.

[0008]

The off gas generated by the operation of the glass melting furnace is sucked and discharged through the inner tube of the off gas discharge pipe.
At this time, in addition to the separation of off-gas from the inner wall due to the formation of an air curtain by the air, by the steam blowing means,
Water vapor is sent from the steam inlet into the inner pipe, and adhesion of dust and the like in off-gas is suppressed. The steam purifies the offgas by attaching and removing the dust and the like in the offgas from the condensate during cooling in the subsequent offgas treatment step. When water is supplied to the steam blowing pipe by the operation of the water supply system in the steam blowing means, the steam plenum portion of the steam blowing pipe generates steam due to the heat absorption from the glass melting furnace, and the steam is discharged from the steam blowing port. The structural material in the vicinity of the steam injection port is cooled by the latent heat generated when the steam is generated. The water sent from the water supply system to the steam blowing pipe is stored in the annular recess portion, and is sequentially vaporized and sent into the inner pipe. At this time, if the steam injection pipe is arranged in the vertical direction, an annular recess is formed by arranging the annular ring inside, and the annular pipe is formed between the inner pipe and the end on the suction port side. A slit-shaped steam inlet is formed, and an annular steam flow is ejected in a state of surrounding the offgas.

[0009]

EXAMPLE An example of the glass melting furnace according to the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 10 is a ceiling wall (melting furnace wall, glass melting furnace main body), 31 is a steam blowing port, 32 is a steam blowing means, 33 is a steam blowing pipe,
Reference numeral 34 is a water supply system, and 35 is a steam plenum portion.

Ceiling wall of the glass melting furnace 3 (melting furnace wall)
A through hole 10a for inserting the off-gas discharge pipe 4, that is, the outer pipe 12, the inner pipe 13, the steam injection pipe 33, and the like is formed in the pipe 10. In the example of FIG.
2, 13, and 33 are integrated and are detachably attached to the ceiling wall 10 at a position above the ceiling wall 10 via a flange 33a.

The steam blowing port 31 is arranged at the end of the suction port 17 of the inner pipe 13 and jets the steam from the steam blowing means 32 into the inner pipe 13.

As shown in FIG. 1, the steam blowing means 32 is arranged in a connected state to the steam blowing port 31,
A steam blowing pipe 33 which is inserted into the through hole 10a in the vertical direction at a distance from the outer pipe 12, and a water supply system 3 connected to the steam blowing pipe 33 for supplying water.
4, a steam plenum portion 35 arranged at the lower end portion of the steam blowing pipe 33, an annular recess portion 36 for storing water in a part of the steam plenum portion 35, and an inner side of the annular recess portion 36. An annular ring 37 that is arranged in an enclosed state to form an annular slit-shaped steam inlet 31 and to set its cross-sectional area
And.

A compressed air supply system 38 for supplying compressed air is connected to the annular space 12a between the outer pipe 12 and the inner pipe 13.

A check valve 39 is provided in the water supply system 34 in the middle of the water supply system to prevent water or water vapor from flowing backward.

The glass melting furnace 3 configured as described above
In the operating state, off gas is generated by the injection of waste liquid or the like into the molten glass R. The off-gas flow G is sucked from the suction port 17 by the off-gas discharge pipe 4 arranged in the ceiling wall 10 in a penetrating state, and sucked and discharged via the inner pipe 13.

When the steam blowing means 32 and the pressurized air supply system 38 are operated together with the operation of the glass melting furnace 3, air is blown into each inner slit 13 of each slit 16 as in the example of FIG. The air curtain 6 is formed by being jetted inwardly of the inner pipe 13 through the air gap 6 to prevent dust or mist contained in the off-gas flow G from adhering to the inner surface of the inner pipe 13. However, in the example of FIG. 1, water vapor is simultaneously sent into the inner pipe 13.

When an appropriate amount of water is supplied to the steam injection pipe 33 by the operation of the water supply system 34 of the steam injection means 32, the water flows down into the annular recess 36 and is stored therein. At this time, since heat is transferred from the inside of the glass melting furnace 3 to the steam blowing pipe 33 and the annular ring 37, the stored water W in the annular recess 36 is heated to become steam, and the steam blowing port 31 Is jetted from the inside to the inner tube 13. When the stored water W is turned into steam, it absorbs latent heat, so that the lower end of the steam blowing pipe 33, the annular ring 37, and other structural materials in the vicinity thereof are cooled. The check valve 39 prevents the generated water vapor from flowing back into the water supply system 34 via the steam blowing pipe 33, so that the pressure inside the steam blowing pipe 33 and the pressure in the steam plenum 35 increase. At the same time, water vapor is sequentially supplied to the inner pipe 13.
Will be sent inside.

The steam is annularly ejected from the annular slit-shaped steam inlet 31 into the inner pipe 13, so that it becomes a state surrounding the off-gas flow G, that is, a part of the off-gas flow G. While being cooled, the inner pipe 13 is transferred downstream. The temperature of the water vapor is generally lower than the temperature of the off-gas flow G, and the temperature of the air jetted from the slit 16 of the inner pipe 13 is lower than the temperature of the water vapor or the off-gas flow G. Controls temperature rise.

Further, the off-gas flow G is transferred downstream together with water vapor and air through the off-gas discharge pipe 4, and dust and the like are removed by cooling in a subsequent off-gas treatment step. As a result, the dust mixed in the off-gas flow G adheres to form an environment in which it can be easily adsorbed and removed, so that the off-gas is purified.

[0020]

As described above, the glass melting furnace according to the present invention has the following effects. (1) By adopting a configuration including a steam blow-in port arranged at the end of the inner pipe on the suction port side and a steam blow-in means connected to the steam blow-in port and sending in steam, Due to the condensing and significant volume reduction, the total amount of offgas processed by the downstream offgas processing step can be reduced. (2) The condensate of water vapor can enhance the adsorptivity of dust and the like contained in the off-gas to facilitate the treatment of waste gas. (3) By converting the water sent from the water supply system into steam, heat is absorbed by latent heat, and the structure and piping exposed inside the glass melting furnace can be effectively cooled. (4) By storing water in the annular recess at the lower end of the steam blowing pipe, when the offgas discharge pipe is placed on the ceiling wall of the glass melting furnace, the high temperature part, the offgas discharge flow path, etc. Cooling can be accelerated. (5) By ejecting steam from the annular slit-shaped steam inlet into the inner pipe, the steam is merged around the off-gas flow and the temperature rise of the high temperature portion of the inner pipe is suppressed.
In addition, the amount of air for forming the air curtain can be reduced, and the offgas treatment can be simplified.

[Brief description of drawings]

FIG. 1 is a front sectional view of an essential part showing an embodiment of a glass melting furnace according to the present invention.

FIG. 2 is a front sectional view showing a schematic example of a vitrification facility.

FIG. 3 is a front sectional view showing a conventional example of a glass melting furnace.

[Explanation of symbols]

3 glass melting furnace 4 Off-gas exhaust pipe 6 Air curtain 10 Ceiling wall (melting furnace wall, glass melting furnace body) 10a through hole 12 outer tube 12a annular space part 13 Inner tube 16 slits 17 Suction port 31 Steam inlet 32 Steam injection means 33 Steam injection pipe 33a flange 34 Water supply system 35 Steam plenum 36 annular recess 37 annular ring 38 Pressurized air supply system 39 Check valve G off-gas flow W stored water R molten glass

Claims (4)

(57) [Claims] 1. An inner pipe (13) and an outer pipe (1) outside thereof.
2), having a steam blow pipe (33) further outside
It becomes the inside of the inner tube of the off-gas discharge pipe (4), a glass melting furnace so as to be inserted in a state of forming an air curtain (6) isolates the off-gas from the inner wall (3), forming an air curtain A steam inlet (31) arranged at an end portion of the inner pipe (13) on the off gas inlet (17) side,
A glass-melting furnace comprising: a steam-blowing means (32) arranged in a connected state to the steam-blowing port to feed steam. 2. A steam blowing means (32), a steam blowing pipe (33) forming a steam blowing port (31), a water supply system (34) connected to the steam blowing pipe, and steam. The glass fusing furnace according to claim 1, further comprising: a steam plenum portion (35) which is formed in a part of the blowing tube and generates steam by absorbing heat from the glass fusing furnace (3). 3. A steam blowing pipe (33) is arranged in a vertically penetrating manner through a ceiling wall (10) of a glass melting furnace (3), and a water spray is provided at a lower end portion of the steam blowing pipe. An annular recess (36) for storing and evaporating the steam is provided at the steam inlet (3
The glass melting furnace according to claim 2, wherein the glass melting furnace is arranged in a connected state to 1). 4. An annular slit-shaped steam inlet (31) is formed between the end of the inner pipe (13) on the inlet (17) side and the steam inlet pipe (33), and an annular shape is formed. The glass melting furnace according to claim 3, characterized in that an annular ring (37) surrounding the inside of the recess (36) is arranged.