JP3192006B2 - Glass outflow detector for 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 of the type in which a glass type is placed in a crucible and heated and melted, and more specifically, a glass melt discharged on a furnace floor for placing the crucible is discharged. The present invention relates to a glass outflow detecting device of a glass melting furnace provided with a discharge passage, a plug member for opening and closing the outlet of the discharge passage, and a glass outflow detecting means for detecting a glass melt flowing out of the discharge passage.

[0002]

2. Description of the Related Art In the above-mentioned glass melting furnace, a crucible is eroded by a high-temperature glass melt and broken, and the glass melt flows out into the furnace. This is particularly likely to occur in a calcined clay crucible having a high porosity and low erosion resistance to a glass melt. If the outflow of the glass melt is maintained for a long time, the erosion of the refractory material in the furnace bottom by the outflow glass is promoted, and the durability is lowered. Therefore, detection of glass outflow is necessary for early detection of outflow of glass melt, and such a glass outflow detection device, although glass is in an undissolved state, is an electrical insulator. In the state of the melt, a pair of electrodes is provided near the outlet of the discharge path, utilizing the fact that it is an electric conductor. In the related art, when the outflow of the glass melt occurs, the pair of electrodes is electrically connected by the outflow glass melt to detect the outflow of the glass melt.

[0003]

However, according to the above-mentioned conventional technique, although the outflow of the glass melt can be detected, the outflow glass melt is fused to the electrode, so that the detection function is not maintained. Is very troublesome to remove the fused glass melt from the electrode every time after detection, and furthermore, there is a risk of damaging the electrode, requiring maintenance that lacks workability requiring time and labor. . An object of the present invention is to provide a glass outflow detecting device of a glass melting furnace which is excellent in maintenance workability.

[0004]

A feature of the glass outflow detecting device of a glass melting furnace according to the present invention is that the glass outflow detecting means is provided with a nozzle for blowing gas near an outlet in the discharge furnace. In addition, a gas supply means for continuously supplying gas to the nozzle is provided, and a supply detection sensor for detecting a gas supply state to the nozzle is provided. To constitute the gas supply means, a portion of the air in the combustion air supply passage is provided at a position downstream of the supply fan in the combustion air supply pipe to the burner for heating the furnace. It is preferable to branch connect a gas outlet pipe that guides the gas as a gas to the nozzle, or attach the nozzle to the plug.

[0005]

In normal operation, when there is no outflow glass melt near the outlet of the discharge path, the gas is blown out from the nozzle with low resistance. However, when outflow of the glass melt occurs, the outflow glass melt near the outlet of the discharge path. The liquid accumulates and the mouth of the nozzle is closed by the outflowing glass melt, so that the resistance of the gas blowing from the nozzle is significantly increased, and the supply state such as the supply pressure and the gas flow changes. As a result, it is possible to detect the outflow of the glass melt by capturing the change in the supply state. In order to maintain the detection function, it is necessary to eliminate the glass clogging at the nozzle opening, but since the nozzle itself blows out gas, the glass melt enters the nozzle. In addition, even if glass clogging occurs, it is only necessary to remove the glass in the mouth. In particular, when the air supplied to the burner is supplied as gas, a driving device for gas supply such as a fan is not required, and when the nozzle is mounted on the plug material, the plug material removes the outflowing glass melt. Since the nozzle is opened when discharging, the nozzle can be taken out by opening the nozzle at the same time, and the nozzle can be simultaneously set at a predetermined detection position by closing the plug.

[0006]

Thus, according to the present invention, the outflow of the glass melt can be easily detected. In particular, according to the second aspect, the initial cost and the running cost can both be reduced and the detection can be performed economically. According to the third aspect, a structure for taking the nozzle in and out for maintenance is provided. It is only necessary to attach the nozzle to the plug material, and the operation is simple.

[0007]

Next, an embodiment will be described. 1, 2 and 3
Denotes a glass melting furnace (crucible kiln), in which each of an upper wall portion 1, a left and right side wall portion 2, a front wall portion 3, a rear wall portion 4, and a hearth portion 5 of the furnace is formed of a refractory material, and a detachable door. An opening is formed in the front wall portion 3 which also serves as an opening so that the opening 6a of the crucible 6 faces the outside of the furnace.

As a crucible 6 for accommodating the glass x to be melted, a horizontal type (so-called cat crucible) having a mouth 6a formed in a horizontal direction is used, and the crucible 6 is placed on the hearth 5 via a base member 7 in the furnace.

Reference numeral 8 denotes a burner for heating the furnace which forms a combustion flame f in the furnace, 9 denotes a gas supply pipe for supplying a fuel gas g to the burner 8, and 10 denotes a combustion air a to the burner 8. An air supply pipe that is supplied under pressure by the fan 11. 12
Is an exhaust gas outlet for taking out the combustion exhaust gas in the furnace. Also, 1
Reference numeral 3 denotes an exhaust heat recovery heat exchanger that preheats the combustion air a sent to the burner 8 by the air supply pipe 10 by exchanging heat with combustion exhaust gas guided from the exhaust gas port 12 to the flue 14. The air pipe 10 is provided in the exhaust gas passage chamber 13a.
The tube type in which a is inserted is adopted.

Reference numeral 15 denotes a discharge path for drawing out the glass melt flowing out due to the breakage of the crucible 6 inside the furnace. deep. That is, the outflowing glass melt accumulates near the outlet of the discharge path 15. The upper surface of the hearth portion 5, that is, the hearth surface 5a is provided with a gradient for guiding the outflowing glass melt to the discharge path 15, and the outflowing glass melt is provided on the hearth surface 5a. In order to allow the melt to flow down the discharge path 15 as smoothly and quickly as possible, a softener p in the form of pellets, which contacts and reacts with the glass melt to soften the glass melt, is provided. The glass melting furnace has a glass outflow detecting device for detecting the outflow of the glass melt. This glass outflow detection device utilizes the fact that, when the outflow of the glass melt occurs, the outflow glass melt flows down to the discharge path 15 and accumulates in the vicinity of the outlet. Is provided. The glass outflow detection means is provided with a nozzle N for blowing out gas near the outlet of the discharge path 15, and is provided with gas supply means for supplying gas to the nozzle N, and detects a gas supply state to the nozzle N. The supply detection sensor 17 is provided. The nozzle N is mounted on the plug member 16. The gas supply means includes a fan 1 of the combustion air supply pipe 10.
A gas outlet pipe G for guiding a part of the air in the combustion air supply pipe 10 to the nozzle N as a gas is connected to a portion downstream of the gas supply pipe 1 in a branch connection. That is, burner 8
The gas is supplied by utilizing the combustion drive configuration. The supply detection sensor 17 is connected to the discharge path 1
If there is no glass melt near the outlet of 5, the gas is blown out from the nozzle N with low resistance, but the glass melt exists and the tip melt of the nozzle N is covered with the glass melt. And, by utilizing the increase in gas blowing resistance thereby, the detection is performed. Specifically,
It is a pressure gauge that detects the pressure in the gas outlet pipe G by focusing on the fact that the pressure in the gas outlet pipe G corresponds to the resistance change. Therefore, the glass outflow detecting means is a pressure gauge 1
When the pressure detected by the filter 7 becomes equal to or higher than the set value, it is configured to detect that the outflow of the glass melt has occurred. 1
Reference numeral 8 denotes an alarm which, when the outflow of the glass melt is detected by the pressure gauge 17, notifies the occurrence of breakage of the crucible in the furnace.

The burner 8 is of an inverted flame type in which a combustion flame is blown downward, and has a type in which the side surface of the burner forms a flat wall-shaped flame. The burner 8 is disposed on the furnace upper wall 1 near the rear wall. By doing so, a downward vertical wall-shaped combustion flame f in which the flame side faces continue in the furnace width direction and faces the crucible 6 from the back side thereof is formed along the wall surface of the rear wall portion 4.

On the other hand, the exhaust gas port 12
Is formed just above the crucible installation position in the furnace ceiling, and is located on the crucible side with respect to the combustion flame ejection position.

That is, in the above-described structure, the vertical wall-shaped combustion flame f uniformly raises the temperature in the furnace due to the spread of the flame side surface in the furnace width direction, and also uniformly heats the crucible 6 from the back side. The downward injection causes the tip of the combustion flame f or the subsequent high-temperature combustion exhaust gas flow to reach the lower part of the crucible 6 in a wide state in the furnace width direction. Exhaust gas outlet 1 located in
2, the high-temperature combustion exhaust gas in the wide state uniformly rises from the lower portion of the crucible to the crucible periphery, and reaches the exhaust gas port 12 while heating the crucible 6 during the rising process.

The target glass x at the bottom of the crucible is effectively heated by the crucible heating due to the rise of the high-temperature combustion exhaust gas from the lower part of the crucible to the periphery of the crucible, and the convection of the molten glass x in the crucible by heat is promoted. This convection causes the entire melt glass x to be in a homogeneously heated and melted state.

FIGS. 4, 5 and 6 show a burner structure,
19 is a slit-shaped ejection port 19a extending in the furnace width direction,
A flame port block formed with a nozzle insertion chamber 19b communicating therewith, 20 is a burner box having an air chamber 20a inside, 21 is a flat gas nozzle, and the air discharge port 20b of the burner box 20 is connected to the flame port block 19 Burner box 2 in a state where it is connected to nozzle insertion chamber 19b
0 and the flame port block 19, and the gas nozzle 21
The distal end side is inserted into the nozzle insertion chamber 19b, and the gas chamber section 21a on the proximal end side is located inside the air chamber 20a, and is housed in the communication section between the burner box 20 and the flame port block 19. .

Reference numeral 22 denotes a gas introduction pipe for introducing the fuel gas g from the gas supply pipe 9 into the gas chamber 21a in the burner box 20, and 23 denotes an air guide plate in the air chamber 20a. The combustion air a introduced into the air chamber 20a through the air supply port 20c at the side of the box is supplied to the burner box 20 by the air guide plate 23.
The air is discharged to the air discharge port 20b after being diffused to the entire peripheral portion of the inside, and once detoured to the rear end side of the burner box 20, thereby discharging the combustion air a from the air discharge port 20b. As a result, the state of the combustion flame ejection from the slit-shaped ejection port 19a is made uniform in the longitudinal direction of the ports 20b and 19a (corresponding to the furnace width direction).

At the leading edge of the flat gas nozzle 21, a slit-shaped gas passage 2 in the flat portion is provided from the gas chamber portion 21a.
A large number of gas holes 24 are formed in a line over the entire width of the nozzle to blow out the fuel gas g supplied through the nozzle 1b toward the jet port 19a of the flame port block 19, and each side surface near the leading edge of the flat gas nozzle 21 is formed. Are formed with a large number of sub-gas holes 25 that blow out the fuel gas g supplied through the slit-shaped gas passages 21b in a direction perpendicular to the side surfaces of the nozzles in the same manner over the entire width of the nozzles.

Each of the nozzle side surfaces is provided with a wind control projection 26 which is located near the upstream side of the row of auxiliary gas holes 25 in the direction of air flow in the nozzle insertion chamber 19b as an air ejection passage and is in an upright state with respect to the nozzle side surfaces. Are provided over the entire width of the nozzle, and a large number of air ventilation holes 26a are formed in the wind control projections 26 in two rows over the entire width of the nozzle.

That is, in this burner structure, the air flow passing outside the wind control projections 26 in the nozzle insertion chamber 19b serving as the air blowing path, the fuel gas blown out from the 25 rows of auxiliary gas holes and the air of the wind control projections 26 Three layers of a mixed flow with the air passing through the row of ventilation holes 26a and a fuel gas stream blown out from the row of gas holes 24 at the nozzle tip are formed. The slit-shaped outlet 19a in the block 19 is jetted into the furnace from the entire width in the longitudinal direction, whereby the downward vertical wall-shaped combustion flame f is formed along the wall surface of the furnace rear wall 4 as described above.

[Another embodiment] Next, another embodiment will be described.

The specific structure of the burner 8 for forming the downwardly-facing vertical wall-shaped combustion flame f in the furnace can be variously changed. For example, the flat gas nozzle 21 as in the above-described embodiment can be used.
Instead of using a gas nozzle, a structure in which a plurality of gas nozzles are juxtaposed in the same gas ejection direction and in a direction orthogonal to the gas ejection direction may be adopted.

In the above-described embodiment, the vertical wall-shaped combustion flame f is formed in a flat plate shape. Instead, the vertical wall-shaped combustion flame f is formed into a curved plate shape surrounding the crucible 6 as shown in FIG. May be formed.

Further, the vertical wall combustion flame f is not limited to a complete series of flames having a strict gap in the furnace width direction, but a plurality of downwardly-spouting combustion flames are arranged relatively densely in the furnace width direction. It is good also as thing of.

In the above-described embodiment, the gas supply means for supplying air for combustion as a gas is shown. However, the gas supply means is provided with a separate fan and supplies gas separately from combustion. It may be. In the above-described embodiment, the softening material p is provided to increase the fluidity of the glass melt, but the present invention may be carried out without the softening material p. In the above-described embodiment, the nozzle N is mounted on the plug 16, but the nozzle N may be mounted on a member other than the plug 16.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a furnace.

FIG. 2 is a sectional front view of the furnace.

FIG. 3 is a sectional view of the furnace in plan view.

FIG. 4 is an enlarged sectional view of a burner in a furnace side view direction.

FIG. 5 is a partially cutaway view of the burner in a furnace front view direction.

FIG. 6 is a front view of a gas nozzle tip.

FIG. 7 is a plan view showing another embodiment.

[Explanation of symbols]

 6 Crucible 8 Burner 15 Discharge path 16 Plug material N Nozzle 17 Supply detection sensor 10 Air supply pipe for combustion G Gas outlet pipe 11 Fan

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-89419 (JP, A) JP-A-6-135726 (JP, A) JP-A-1-234334 (JP, A) JP-A-62-1984 19683 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C03B 5/26 F27B 14/20 C03B 5/08

Claims (3)

(57) [Claims] A discharge path (1) for discharging a glass melt flowing out onto a hearth (5) for mounting a crucible (6).
5), a glass melting furnace provided with a plug member (16) for opening and closing the outlet of the discharge path (15), and a glass outflow detecting means for detecting the outflow glass melt in the discharge path (15). A nozzle (N) for blowing out gas near the outlet in the discharge path (15) to constitute the glass outflow detecting means, and a gas for continuously supplying gas to the nozzle (N). A glass outflow detection device for a glass melting furnace, comprising a supply means and a supply detection sensor (17) for detecting a gas supply state to the nozzle (N). 2. A gas supply means comprising: a portion of a combustion air supply pipe (10) to a burner (8) for heating the furnace, on a downstream side of a supply fan (11); 2. A glass outflow detecting device for a glass melting furnace according to claim 1, wherein a gas outlet path (G) for guiding a part of the air in the combustion air supply pipe (10) to the nozzle (N) as a gas is branched. . 3. The glass outflow detecting device for a glass melting furnace according to claim 1, wherein the nozzle (N) is mounted on the plug member (16).