JP2017077997A - Glass melting single furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass melting single furnace capable of heating a glass raw material at high temperature in the state of avoiding the damage of a crucible due to occurrence of cracks.SOLUTION: A gas burner B arranged in the inside of a furnace body A and for combusting fuel gas G to heat a crucible 1 is mounted on the furnace wall part 2 of the furnace body A and is constituted so as to completely combust the fuel gas G in a state ejected on the front side of the burner so as to spread the fuel gas G and combustion air E in the radial direction over the entire circumference in the circumferential direction to form a planar combustion flame F. A cat type glass melting single crucible 1 includes a plurality of gas burners B distributed and arranged in a place except an upper portion out of the periphery of the crucible 1 in the state of positioned so that the crucible 1 is positioned on the front side of the burner, and the planar combustion flame F is separately combusted from the crucible 1.SELECTED DRAWING: Figure 1

Description

In the present invention, a single cat-shaped crucible for melting glass is disposed inside a furnace body,
The gas burner which burns fuel gas and heats the crucible relates to a single glass melting furnace equipped on the furnace wall of the furnace body.

  Such a single melting furnace for glass melting heats a glass raw material charged in the crucible by heating a single cat-shaped crucible arranged inside the furnace body with a gas burner, The melting glass in the crucible will be used to make glass products such as vases and cups.

As a first conventional example of a single glass melting furnace, a single gas burner forming a planar combustion flame is positioned on the furnace wall on the back side of the crucible in a state where the crucible is positioned on the front side of the burner. Some are arranged (for example, Patent Document 1 (see paragraph [0002], FIG. 8)).
Although not described in Patent Document 1, the planar combustion flame is generally formed in a state where fuel gas is completely burned.

  Incidentally, although Patent Document 1 describes that the planar combustion flame is in a form that radially expands in the radial direction from the center of ejection, an explanation of how gas fuel and combustion air are ejected is described. However, the planar combustion flame is formed by ejecting the fuel gas and the combustion air to the burner front side so as to expand in the radial direction over the entire circumference in the circumferential direction.

  Patent Document 1 discloses, as a second conventional example of a single glass melting furnace, a gas burner that forms a combustion flame that has a linear shape in plan view covering the back of a cat-shaped crucible and extends downward in a curtain shape. However, it is described that it is arrange | positioned in the ceiling part located in the upper side of the crucible in a furnace wall part (refer patent document 1 (paragraph [0018], FIG.1 and FIG.3)).

  As a third conventional example of a single melting furnace for glass melting, a gas burner that forms a combustion flame in which the shape in plan view surrounding the left and right sides and the back of a cat-shaped crucible is U-shaped and extends downward in a curtain shape, There is one disposed in a ceiling portion located on the upper side of the crucible in the furnace wall portion (for example, Patent Document 2 (see FIGS. 1 to 3)).

JP-A-6-137768 Japanese Patent Publication No. 7-88221

In recent years, glass raw materials that are heated to melt glass raw materials, such as glass raw materials with a high silicon content, are melted in a single glass melting furnace as glass raw materials to be melted. It may be desirable to do so.
However, the single glass melting furnaces of the first to third conventional examples are unsuitable for heating a glass raw material to a high temperature (for example, 1400 ° C.), and improvement is desired. It was.

That is, in the first conventional example, when the amount of combustion of the gas burner arranged at the back of the crucible is increased to heat the glass raw material to a high temperature (for example, 1400 ° C.), only the back wall portion of the crucible is locally hot. There was a possibility that the crucible might be cracked due to being heated by the heat.
That is, there is a possibility that a large temperature difference occurs in the temperature distribution in each part of the crucible, and the crucible is cracked.

  If the planar combustion flame formed in the gas burner is greatly separated from the back of the crucible, only the back wall portion of the crucible can be suppressed from being locally heated to a high temperature. Since the gas burner is provided at a position far away from the back of the crucible, there is a disadvantage that the furnace body is increased in size and is difficult to put into practical use.

In the second conventional example, when the amount of combustion of the gas burner disposed on the ceiling of the furnace wall is increased to heat the glass raw material to a high temperature (for example, 1400 ° C.), the crucible is similar to the first conventional example. Due to the fact that only the back wall portion of this was locally heated to a high temperature, there was a risk of cracking in the crucible.
Incidentally, in the case of this second conventional example, the upper part of the back wall portion of the crucible tends to be heated to a high temperature by the gas burner. Therefore, if the combustion amount of the gas burner is increased, The upper part of the crucible is also very hot, and this also makes it easy for cracks to occur in the crucible.

  In other words, the upper part of the crucible is heated by the gas burner to a high temperature even though there is no glass raw material to be melted in the upper part inside the crucible. There was a risk of occurrence.

  In the third conventional example, when the amount of combustion of the gas burner disposed on the ceiling of the furnace wall is increased in order to heat the glass raw material to a high temperature (for example, 1400 ° C.), the combustion flame becomes a cat-type crucible. Since the shape in plan view surrounding both the left and right sides and the back is a U-shape and is a curtain shape extending downward, only the back wall portion of the crucible is localized as in the first and second conventional examples. It is not heated to a high temperature.

  However, as in the second conventional example, the upper part of the cat-type crucible tends to be heated to a high temperature by the combustion flame. Therefore, when the combustion amount of the gas burner is increased, there is no glass raw material to be melted. Due to the fact that the upper part of the crucible is heated to a considerably high temperature, there is a risk that the crucible will crack.

  As described above, the single melting furnace for glass melting of the first to third conventional examples increases the combustion amount of the gas burner in order to heat the glass raw material to a high temperature (for example, 1400 ° C.). There was a risk of damage due to the occurrence, and an improvement was desired.

  The present invention has been made in view of the above circumstances, and the purpose thereof is a glass melting alone capable of heating a glass raw material to a high temperature in a state where the crucible is avoided from being damaged by the occurrence of cracks. The point is to provide a kiln.

In the single furnace for melting glass of the present invention, a single cat-type crucible for melting glass is arranged inside the furnace body,
A gas burner for burning the fuel gas to heat the crucible is provided on the furnace wall of the furnace body, and the first characteristic configuration thereof is:
The gas burner completely burns the fuel gas in a state in which the fuel gas and combustion air are jetted to the front side of the burner so as to expand in the radial direction over the entire circumference in the circumferential direction to form a planar combustion flame. Composed of
A plurality of the gas burners are positioned in a position excluding the upper part of the periphery of the crucible in a state where the crucible is positioned on the front side of the burner and the planar combustion flame is positioned so as to burn away from the crucible. It is characterized by being distributed.

  That is, the gas burner completely burns the fuel gas in a state in which the fuel gas and the combustion air are jetted to the front side of the burner so as to expand in the radial direction over the entire circumferential direction so as to form a planar combustion flame. Since it is comprised, since a planar combustion flame can heat a large range and it burns in a high temperature state by complete combustion, a gas burner can heat a large range at high temperature.

  In other words, the planar combustion flame of the gas burner can heat a large range of the crucible due to a wide range of generating radiant heat and a wide flow area of the combustion exhaust gas flowing to the front side of the burner. .

  Then, a plurality of gas burners forming the planar combustion flame are positioned so that the crucible is located on the front side of the burner and the planar combustion flame is burned away from the crucible, and the upper part of the periphery of the crucible is Since it is dispersedly arranged at the removed locations, the glass material can be heated to a high temperature while avoiding damage to the crucible due to the occurrence of cracks.

  That is, for example, by providing a plurality of gas burners at positions corresponding to the lateral side and the back of the crucible, by heating the different portions of the crucible with the plurality of gas burners, the overall combustion amount of the plurality of gas burners is reduced. Since the amount of combustion that can heat the glass raw material inside the crucible to a high temperature (for example, 1400 ° C.) can be achieved, it is possible to avoid locally heating the crucible to a high temperature to the extent that cracking occurs. The glass raw material inside the crucible can be heated to a high temperature.

  In addition, since the planar combustion flame in which the fuel gas burns completely is hot, there is a risk of cracking in the crucible due to heat shock when the planar combustion flame comes into contact with the crucible. Since the flame is positioned so as to burn away from the crucible, the glass raw material inside the crucible can be heated to a high temperature while avoiding cracks in the crucible due to heat shock.

  Incidentally, although the total combustion amount of the plurality of gas burners is a combustion amount that can heat the glass raw material inside the crucible to a high temperature (for example, 1400 ° C.), the combustion amount of each of the plurality of gas burners is Since the amount of combustion is sufficiently small compared to the amount of combustion that can heat the internal glass raw material to a high temperature (for example, 1400 ° C.), it is possible to arrange each of the plurality of gas burners close to the crucible. it can.

  In addition, the gas burner can be dispersedly arranged in a portion excluding the upper part of the periphery of the crucible so that the gas burner can be prevented from being heated to a high temperature in the upper part of the crucible where the glass raw material to be melted does not exist. Therefore, also from this point, the glass raw material can be heated to a high temperature while avoiding the occurrence of cracks in the crucible.

  In short, according to the first characteristic configuration of the present invention, it is possible to provide a single glass melting furnace capable of heating a glass raw material to a high temperature in a state where the crucible is avoided from being damaged due to generation of cracks.

In addition to the first characteristic configuration described above, the second characteristic configuration of the single glass melting furnace according to the present invention is as follows.
The gas burner is configured to form a skirt-like combustion flame that expands in a radial direction toward the front side of the combustion flame as the planar combustion flame.

  That is, since the gas burner is configured to form a skirt-like combustion flame that expands in the radial direction toward the front side of the combustion flame as a planar combustion flame, the heat generated by the formation of the planar combustion flame. The glass material inside the crucible can be heated satisfactorily while efficiently using as a heat for heating the crucible.

  In other words, the gas burner is configured as a flat combustion flame so as to form a flat combustion flame extending along the radial direction while adhering to the inner surface of the burner tile and the furnace wall portion without extending to the tip side. However, in this case, the heat generated by the formation of the planar combustion flame is likely to be conducted to the furnace wall and the like, and there is a disadvantage that it is not efficiently used for heating the crucible, According to the second characteristic configuration of the present invention, the heat generated by the formation of the planar combustion flame can be efficiently used as heat for heating the crucible.

  In short, according to the second characteristic configuration of the present invention, in addition to the operational effects of the first characteristic configuration, the heat generated by the formation of the planar combustion flame is efficiently used as the heat for heating the crucible. However, it is possible to provide a single glass melting furnace capable of heating the glass raw material inside the crucible satisfactorily.

In addition to the first or second characteristic configuration described above, the third characteristic configuration of the single glass melting furnace according to the present invention is as follows.
The air ratio of the gas burner is set in a range of 1.01 to 1.1.

  That is, when the air ratio of the gas burner is set in the range of 1.01 to 1.1, a planar combustion flame is formed in a state where the fuel gas is completely burned. The glass raw material can be appropriately heated to a high temperature state by increasing the temperature.

  That is, when the air ratio is set to 1.0 or more and the fuel gas is completely burned, the air ratio is set to a range of 1.01 to 1.1 to reduce the amount of combustion air. Since the temperature of the planar combustion flame can be increased as compared with the case where the air ratio is made larger than 1.1 and the amount of combustion air is increased, the glass raw material can be appropriately heated to a high temperature state. It is.

  In short, according to the third characteristic configuration of the present invention, in addition to the operational effects of the first or second characteristic configuration, it is possible to provide a single glass melting furnace capable of appropriately heating a glass raw material to a high temperature state.

In addition to any one of the first to third characteristic configurations described above, the fourth characteristic configuration of the single glass melting furnace according to the present invention is as follows.
An air preheating heat exchanger that preheats the combustion air with combustion exhaust gas discharged from the inside of the furnace body is provided.

  That is, since the combustion air is preheated by the combustion exhaust gas discharged from the inside of the furnace body, the glass raw material can be heated more appropriately.

  In other words, since the combustion air is preheated, the temperature of the planar combustion flame can be increased, so that the glass raw material can be heated more appropriately.

  In short, according to the fourth feature configuration of the present invention, in addition to the operational effects of the first to third feature configurations, a single glass melting furnace capable of more appropriately heating the glass raw material to a high temperature state. Can provide.

In addition to any of the first to fourth characteristic configurations described above, the fifth characteristic configuration of the single glass melting furnace according to the present invention is as follows.
The gas burner is provided at a position corresponding to a lateral side portion and a back portion of the crucible.

  That is, when disposing a plurality of gas burners at locations other than the upper part of the periphery of the crucible, the gas burners are provided at positions corresponding to the lateral side and the back of the crucible. By heating the back portion with a gas burner, the glass raw material can be heated to a high temperature state while preventing the crucible from being locally heated and avoiding damage to the crucible.

  And since the location corresponding to the side part of the crucible in a furnace wall part and the location corresponding to a back part are locations where a gas burner is easy to install, the gas burner can be installed satisfactorily.

  In short, according to the fifth feature configuration of the present invention, in addition to the operational effects of any of the first to fourth feature configurations, the gas burner can be satisfactorily installed while avoiding damage to the crucible. A single glass melting furnace capable of heating the raw material to a high temperature state can be provided.

In addition to the fifth characteristic configuration described above, the sixth characteristic configuration of the single glass melting furnace according to the present invention is as follows.
The gas burner is provided at a position corresponding to both lateral sides of the crucible.

  That is, in dispersively arranging a plurality of gas burners at locations other than the upper part of the periphery of the crucible, in addition to the back of the crucible, gas burners are provided at positions corresponding to both lateral sides of the crucible, By heating both sides of the crucible with a gas burner in addition to the back of the crucible, the temperature of each part of the crucible is promoted to be uniform and the glass raw material is brought to a high temperature state while appropriately avoiding damage to the crucible. Can be heated.

  In short, according to the sixth characteristic configuration of the present invention, in addition to the operational effects of the fifth characteristic configuration, the temperature of the crucible is made uniform in order to appropriately avoid the crucible damage and A single furnace for melting glass that can be heated to a high temperature state can be provided.

In addition to the fifth or sixth characteristic configuration described above, the seventh characteristic configuration of the single glass melting furnace according to the present invention is as follows.
The gas burner is provided at a position corresponding to a front portion of the crucible.

  That is, in order to disperse and arrange a plurality of gas burners at locations other than the upper part of the periphery of the crucible, in addition to the back and side portions of the crucible, gas burners are provided at positions corresponding to the front part of the crucible. Then, in addition to the back and sides of the crucible, by heating the front part of the crucible with a gas burner, it is possible to accurately promote uniform temperature in various parts of the crucible, while appropriately avoiding damage to the crucible, The glass raw material can be heated to a high temperature state.

  By the way, the part corresponding to the front part of the crucible in the furnace wall part is generally decomposed when the crucible is replaced and is assembled into a wall shape after the replacement of the crucible, so that it corresponds to the front part of the crucible. The gas burner installed at the position is once removed when the crucible is replaced, and is mounted again after the crucible is replaced.

  In short, according to the seventh characteristic configuration of the present invention, in addition to the fifth or sixth characteristic configuration described above, the temperature can be made uniform in each part of the crucible accurately, and damage to the crucible can be avoided appropriately. A single glass melting furnace capable of heating the raw material to a high temperature state can be provided.

In addition to any of the fifth to seventh feature configurations described above, the eighth feature configuration of the single glass melting furnace according to the present invention is as follows.
The gas burner is provided at a position corresponding to the bottom of the crucible.

  In other words, when the plurality of gas burners are dispersedly arranged in the place except for the upper part of the periphery of the crucible, the gas burners are provided at positions corresponding to the bottom of the crucible in addition to the back and side portions of the crucible. In addition to the back and sides of the crucible, by heating the bottom of the crucible with a gas burner, the temperature of each part of the crucible is accurately promoted, and the crucible damage is appropriately avoided, while the glass raw material is properly avoided. Can be heated to a high temperature state.

  Moreover, when the bottom of the crucible is heated with a gas burner, the molten glass in the crucible is easily convected up and down, so that the molten glass in the crucible is easily heated uniformly.

  In short, according to the eighth characteristic configuration of the present invention, in addition to the operational effects of any of the fifth to seventh characteristic configurations, the temperature can be uniformly made uniform in each part of the crucible, and the crucible can be appropriately damaged. While avoiding, the glass raw material can be heated to a high temperature state. In addition, it is possible to provide a single furnace for melting glass that makes it easy to uniformly heat the molten glass in the crucible.

In addition to any of the first to eighth characteristic configurations described above, the ninth characteristic configuration of the single glass melting furnace according to the present invention is as follows.
A combustion amount adjusting means for adjusting the combustion amount of each of the plurality of gas burners is provided.

  That is, since the combustion amount of a plurality of gas burners dispersedly arranged around the crucible can be adjusted individually by the combustion amount adjusting means, depending on the amount of the glass raw material to be melted put in the crucible, When adjusting the amount of combustion of a plurality of gas burners, or when a plurality of gas burners are provided in a vertically aligned state, the amount of combustion of the gas burner positioned above the upper surface of the molten glass in the crucible is determined by melting in the crucible. The amount of combustion of each of the plurality of gas burners can be adjusted to a state in which each of the plurality of gas burners is appropriately heated, for example, the amount of combustion of the plurality of gas burners is made smaller than the amount of combustion of the gas burner located below the upper surface of the glass.

  In short, according to the ninth feature configuration of the present invention, in addition to the operational effects of any of the first to eighth feature configurations, a single furnace for melting glass that can be adjusted to a state in which each of the plurality of gas burners is appropriately heated. Can provide.

Longitudinal side view of a single furnace for melting glass according to the first embodiment Longitudinal front view of the single glass melting furnace of the same embodiment Cross-sectional plan view of the single glass melting furnace of the same embodiment Cross section of gas burner VV line sectional view in FIG. Longitudinal side view of a single glass melting furnace according to the second embodiment Longitudinal side view of a single glass melting furnace according to the third embodiment Vertical side view showing a single furnace for melting glass according to the fourth embodiment Longitudinal front view of the single glass melting furnace of the same embodiment Cross-sectional plan view of the single glass melting furnace of the same embodiment Longitudinal front view showing the thermal power adjustment state of the same embodiment

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
(Overall configuration of single kiln for melting glass)
As shown in FIGS. 1 to 3, the single furnace for melting glass has a furnace body A in which a single cat-type crucible 1 for melting glass is disposed, and a furnace wall 2 of the furnace body A. A gas burner B that is equipped and heats the crucible 1 is provided, and is configured to melt the glass raw material charged into the crucible 1.

The furnace wall portion 2 is formed of a refractory material such as a refractory brick, and includes a bottom wall portion 2t, a pair of side wall portions 2s, an upper wall portion 2u, a back wall portion 2r, and a front wall portion 2f. It has.
The front wall portion 2f is once disassembled when the crucible 1 is replaced, and after the replacement of the crucible 1, it is reassembled into a wall shape using a refractory brick or the like. The crucible 1 is assembled so that the mouth 1A of the crucible 1 is exposed to the outside of the furnace.

  Further, in the present embodiment, the pair of side wall portions 2s are configured to have a shape in which the upper end side is bent inward as shown in FIG. Alternatively, it may be implemented in the form of a wall that extends vertically in a straight line.

The crucible 1 is placed on the upper part of the base material 3 placed on the upper part of the bottom wall 2t of the furnace body A, and the base material 3 is generally composed of refractory bricks in many cases. .
Incidentally, the base 3 on which the crucible 1 is placed is often installed at locations corresponding to the four corners of the bottom of the crucible 1.

Further, the bottom wall 2t of the furnace body A has an exhaust gas flow path 4 for flowing the combustion exhaust gas of the gas burner B. The inlet 4a is opened to the front side inside the furnace body A and the outlet 4b is opened to the bottom wall 2t. It is formed in the form extended in the front-back direction of the furnace body A in the state opened to the furnace body rear side.
That is, the combustion exhaust gas inside the furnace body A is configured to be guided outside the furnace through the exhaust gas flow path 4.

As shown in FIG. 1, the gas burner B is configured to burn a fuel gas G such as city gas containing methane as a main component by the combustion air E blown by the blower 5.
The combustion air E blown by the blower 5 is supplied to the air preheating heat exchanger 6, and the combustion air E that has passed through the air preheating heat exchanger 6 is supplied to the gas burner B through the air supply path 7. Combustion exhaust gas that is configured to be guided outside the furnace through the exhaust gas flow path 4 is guided to an exhaust chimney (not shown) through an exhaust gas discharge path 8 that passes through the air preheating heat exchanger 6. It is configured.

  That is, the combustion air E blown by the blower 5 is preheated by the exhaust gas discharged from the inside of the furnace body A by the air preheating heat exchanger 6 and then supplied to the gas burner B. ing.

  Incidentally, the air supply path 7 for supplying the combustion air E to the gas burner B is provided with an air adjusting damper 9 for adjusting the supply amount of the combustion air E, and the fuel supply path 10 for supplying the fuel gas G to the gas burner B. Is provided with a fuel adjustment valve 11 for adjusting the supply amount of the fuel gas G so that the combustion amount of the gas burner B can be adjusted.

(Configuration of gas burner)
As shown in FIGS. 1 to 3, the gas burner B completely burns the fuel gas in a state in which the fuel gas and the combustion air are jetted to the burner front side so as to spread in the radial direction over the entire circumference. In this embodiment, the gas burner B is configured to form a skirt-like combustion flame that expands in the radial direction toward the front side of the combustion flame as a planar combustion flame. The specific configuration will be described later.

In the present embodiment, three gas burners B are dispersedly arranged at positions corresponding to both the lateral sides and the back of the crucible 1 as a place excluding the upper part of the periphery of the crucible 1.
That is, three gas burners B are provided on the pair of side wall portions 2 s and the back wall portion 2 r in the furnace wall portion 2.

  Each gas burner B has a pair of side wall portions 2s and a back wall portion 2r in a state where the crucible 1 is positioned on the front side of the burner and the planar combustion flame F is positioned so as to burn away from the crucible 1. Equipped with.

  The combustion air E preheated by the air preheating heat exchanger 6 is distributed and supplied to each of the three gas burners B through the air supply passages 7 respectively connected to the three gas burners B. It is comprised so that.

  An air supply path 7 connected to each of the three gas burners B is equipped with an air adjusting damper 9 and a fuel supply path 10 for supplying the fuel gas G to each of the three gas burners B. Is provided with a fuel adjustment valve 11 so that the combustion amounts of the three gas burners B can be individually adjusted.

Incidentally, in the present embodiment, the combustion amount adjusting means H that adjusts the combustion amount of each of the three gas burners B includes the air adjustment damper 9 and the fuel adjustment valve 11.
In the present embodiment, the gas burner B is adjusted with the air adjustment damper 9 and the fuel adjustment valve 11 adjusted so that the air ratio of the three gas burners B is in the range of 1.0 to 1.1. It is configured to burn completely.

(Detailed configuration of gas burner)
Since the three gas burners B are configured in the same manner, the detailed configuration of the gas burner B mounted on the back wall 2r of the furnace wall 2 will be described below as a representative.

As shown in FIGS. 4 and 5, the gas burner B is assembled to the burner tile 13 installed in a state of being fitted in the mounting hole 12 formed in the back wall portion 2 r of the furnace wall portion 2, and the burner tile 13. The main body 14 is configured.
The burner tile 13 is formed in a cylindrical shape and has a tip portion forming a morning glory-shaped guide surface Q.

  Inside the main body 14 of the gas burner B, there is a central air supply cylinder 15, a fuel supply cylinder 16 arranged so as to cover the periphery of the air supply cylinder 15, and a state covering the periphery of the fuel supply cylinder 16. A swirling air jet cylinder 17 is provided, and an air chamber 18 is formed at the outer peripheral side of the swirling air jet cylinder 17.

  A portion of the air supply path 7 adjacent to the gas burner B is branched into a first supply path 7A and a second supply path 7B, and a part of the combustion air E supplied from the air supply path 7 is supplied to the first supply path 7A. The remaining part of the combustion air E that is flowed through the passage 7A and supplied from the air supply passage 7 is made to flow through the second supply passage 7B.

  Then, the combustion air E supplied from the first supply path 7A is led to the base end portion of the air supply tube 15 from the first air supply port 19A formed in the bottom portion of the main body portion 14, and the distal end portion of the air supply tube 15 From the second air supply port 19B formed in the side portion of the main body portion 14 to the air chamber 18 from the second air supply passage 7B. It is configured so as to be ejected in a swirling state into the space between the swirling air ejection cylinder 17 and the fuel supply cylinder 16 through a plurality of swirling air ejection holes 20 formed in the swirling air ejection cylinder 17.

  Incidentally, the plurality of swirling air ejection holes 20 are provided at intervals in the circumferential direction in a state where the longitudinal direction thereof is formed in a direction along the tangent line of the swirling air ejection cylinder 17. Is blown out in a direction along the tangent line of the swirling air ejection cylinder 17, so that the combustion air E is introduced into the space between the swirling air ejection cylinder 17 and the fuel supply cylinder 16. A swirling flow is formed.

  Further, the fuel gas G supplied from the fuel supply port 21 formed in the main body 14 is guided to the space between the air supply cylinder 15 and the fuel supply cylinder 16 and then formed at the tip of the fuel supply cylinder 16. It is configured to be ejected from the fuel ejection port 22.

  Accordingly, the gas burner B is supplied from the combustion air E ejected from the air supply cylinder 15 and the combustion air E supplied in a swirling state from the swirling air ejection cylinder 17 and the fuel outlet 22 at the tip of the fuel supply cylinder 16. The fuel gas G to be ejected is mixed in the mixing space inside the burner tile 13, and the mixed gas mixed in the mixing space is radial along the morning glory-shaped guide surface Q at the tip of the burner tile 13. It is comprised so that it may burn in the state which forms the planar combustion flame F, guiding outside.

  That is, the gas burner B completely burns the fuel gas in a state in which the fuel gas G and the combustion air E are jetted to the front side of the burner so as to expand in the radial direction over the entire circumference in the circumferential direction. The gas burner B is formed so as to form a skirt-like combustion flame that expands in a radial direction toward the front side of the combustion flame as a planar combustion flame.

  When the explanation is added, 50 to 90% of the combustion air E is ejected from the swirling air ejection hole 20 and the remainder of the combustion air E is ejected from the air supply cylinder 15, so that the form of the planar combustion flame F is A skirt-like combustion flame that expands greatly in the radial direction toward the tip side of the combustion flame is formed.

  Incidentally, when 90 to 100% of the combustion air E is ejected from the swirling air ejection hole 20 and the remainder of the combustion air E is ejected from the air supply cylinder 15, the form of the planar combustion flame F becomes the burner. Although it does not extend to the front side, it becomes a flat combustion flame that adheres to the burner tile 13 and the back wall 2r (burns in) and burns, but in this embodiment, as described above, the planar combustion flame F Is a skirt-like combustion flame that burns in a non-attached state to the burner tile 13 and the back wall 2r.

  As described above, in the single glass melting furnace according to the present embodiment, the three gas burners B forming the planar combustion flame F are located on the front side of the burner and the planar combustion flame F is separated from the crucible. In a state where the crucible 1 is positioned so as to burn, the glass raw material is heated to a high temperature while avoiding damage to the crucible 1 due to generation of cracks. Can be heated.

  That is, three gas burners B are provided at positions corresponding to both the lateral sides and the back portion of the crucible 1, and three gas burners are heated while heating different portions of the crucible 1 with the three gas burners B. By making the total amount of combustion of B a combustion amount that can heat the glass raw material inside the crucible 1 to a high temperature (for example, 1400 ° C.), the crucible 1 is locally heated to such an extent that cracking occurs. While avoiding heating, the glass raw material inside the crucible 1 can be heated to a high temperature.

  Moreover, since the planar combustion flame F in which the fuel gas G completely burns is high temperature, when the planar combustion flame F comes into contact with the crucible 1, there is a possibility that the crucible 1 is cracked due to heat shock. Since the gas burner B is positioned so that the planar combustion flame F burns away from the crucible 1, the glass raw material inside the crucible 1 is avoided while avoiding cracking in the crucible 1 due to heat shock. Can be heated to a high temperature (for example, 1400 ° C.).

  In addition, the gas burner B is dispersedly arranged in the area except for the upper part of the periphery of the crucible 1 to avoid the gas burner B from being heated to a high temperature in the upper part of the crucible 1 where there is no glass raw material to be melted. Therefore, also from this point, the glass raw material can be heated to a high temperature (for example, 1400 ° C.) while avoiding the occurrence of cracks in the crucible 1.

  Incidentally, in order to heat the glass raw material inside the crucible 1 to a high temperature (for example, 1400 ° C.), the detected temperature of a temperature detection sensor (not shown) for detecting the temperature of the internal space of the furnace body A is set to a set target temperature ( For example, the combustion amount of the three gas burners B is adjusted so as to be 1550 ° C.).

  The above set target temperature is set in such a manner that the temperature is gradually changed to a high temperature when starting up the single glass melting furnace, and when the start-up operation is completed, the inside of the crucible 1 is set. The glass raw material is maintained at a set target temperature (for example, 1550 ° C.) for heating the glass material to a high temperature (for example, 1400 ° C.). Will be lowered.

[Second Embodiment]
Next, the second embodiment will be described. This second embodiment shows another embodiment of the installation mode of the gas burner B, and the other configuration is the same as that of the first embodiment. Only parts different from the first embodiment will be described, and the same configurations as those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.

As shown in FIG. 6, in the second embodiment, in addition to the three gas burners B described in the first embodiment, one gas burner B is provided at a position corresponding to the front portion of the crucible 1. ing.
This gas burner B is mounted on the front wall portion 2f of the furnace wall portion 2 in a state where the crucible 1 is positioned on the front side of the burner and the planar combustion flame F is positioned so as to burn away from the crucible 1. Yes.

  The gas burner B provided at a position corresponding to the front portion of the crucible 1 is configured in the same manner as the gas burner B provided at positions corresponding to both the lateral sides and the back portion of the crucible 1 described in the first embodiment.

  Therefore, in this second embodiment, while avoiding damage to the crucible 1 due to the occurrence of cracks in the four gas burners B provided at positions corresponding to both the lateral side, the back and the front of the crucible 1, The glass material can be heated to a high temperature (for example, 1400 ° C.).

  Incidentally, the front wall portion 2f corresponding to the front portion of the crucible 1 in the furnace wall portion 2 is generally disassembled when the crucible 1 is replaced, and is replaced with a wall using a refractory material such as refractory bricks after the replacement of the crucible 1. Therefore, the gas burner B installed at a position corresponding to the front portion of the crucible 1 is once removed when the crucible 1 is replaced. After the replacement of the crucible 1, the gas burner B is again attached to the front wall portion 2f. Will be installed.

[Third Embodiment]
Next, a third embodiment will be described. This third embodiment shows another embodiment of the installation mode of the gas burner B, and the other configuration is the same as that of the first embodiment. Only parts different from the first embodiment will be described, and the same configurations as those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.

  As shown in FIG. 7, in the third embodiment, in addition to the three gas burners B described in the first embodiment, one gas burner B is provided in the crucible 1 as in the second embodiment. A gas burner B is provided at a position corresponding to the front part, and further, one gas burner B is provided at a position corresponding to the bottom part of the crucible 1.

  The gas burner B provided at a position corresponding to the front and bottom of the crucible 1 is positioned so that the crucible 1 is located on the front side of the burner and the planar combustion flame F is burned away from the crucible 1, The front wall 2f and the bottom wall 2t of the furnace wall 2 are equipped.

  The gas burner B provided at a position corresponding to the front part or the bottom part of the crucible 1 is configured in the same manner as the gas burner B provided at a position corresponding to both lateral sides and the back part of the crucible 1 described in the first embodiment. Yes.

  In the third embodiment, the exhaust gas flow path 4 formed in the bottom wall portion 2t of the furnace wall portion 2 opens the inlet 4a to the rear side inside the furnace body A, and the outlet 4b is the bottom wall portion 2t. It is formed in the form extended in the front-back direction of the furnace body A in the state opened to the furnace body rear side.

  Therefore, in this third embodiment, the crucible 1 is prevented from being damaged by the occurrence of cracks in the five gas burners B provided at the positions corresponding to both the lateral side, back, front and bottom of the crucible 1. However, the glass raw material can be heated to a high temperature (for example, 1400 ° C.).

  In addition, when the bottom of the crucible 1 is heated with the gas burner B, the molten glass in the crucible 1 is easily convected up and down, so that there is an advantage that the molten glass in the crucible 1 is easily heated uniformly.

  Incidentally, the gas burner B installed at a position corresponding to the front portion of the crucible 1 is once removed when the crucible 1 is replaced as described in the second embodiment, and after the replacement of the crucible 1, the front wall portion 2f is replaced. Will be mounted again.

[Fourth Embodiment]
Next, although 4th Embodiment is described, this 4th Embodiment shows another embodiment of the installation form of gas burner B, Comprising: Since other structures are the same as that of 1st Embodiment, Only parts different from the first embodiment will be described, and the same configurations as those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.

As shown in FIGS. 8-10, in this 4th Embodiment, the crucible 1 is comprised about 3 times larger compared with the crucible 1 described in 1st Embodiment.
And nine gas burners B are provided in a state where nine gas burners B are allocated to each of the positions corresponding to both the lateral sides, the back and the bottom of the crucible 1.

  The gas burner B provided at positions corresponding to both the lateral side, back and bottom of the crucible 1 is positioned so that the crucible 1 is located on the front side of the burner and the planar combustion flame F is burned away from the crucible 1. In this state, the pair of side wall portions 2s, the back wall portion 2r, and the bottom wall portion 2t of the furnace wall portion 2 are equipped.

Incidentally, nine gas burners B assigned to positions corresponding to both lateral sides of the crucible 1 are installed in a lattice form in which three gas burners B are arranged in the longitudinal direction of the furnace body and in the vertical direction of the furnace body.
In addition, nine gas burners B assigned to positions corresponding to the back of the crucible 1 are installed in a lattice form in which three gas burners B are arranged in each of the furnace body width direction and the furnace body vertical direction.
Further, nine gas burners B assigned to positions corresponding to the bottom of the crucible 1 are installed in a lattice form in which three gas burners B are arranged in each of the furnace body width direction and the furnace body vertical direction.

  The gas burner B provided at positions corresponding to both lateral sides, back and bottom of the crucible 1 is the same as the gas burner B provided at positions corresponding to both lateral sides and back of the crucible 1 described in the first embodiment. It is configured.

  In the fourth embodiment, the air preheating heat exchanger 6 that preheats the combustion air E supplied to the gas burner B is omitted, and the non-preheated combustion air E is supplied to the gas burner B. It is comprised so that.

  Therefore, in the fourth embodiment, the crucible 1 is generated by cracks in the 27 gas burners B provided in a state where nine are assigned to the positions corresponding to both the lateral side, the back and the bottom of the crucible 1. The glass material can be heated to a high temperature (for example, 1400 ° C.) while avoiding damage to the glass.

  Further, as shown in FIG. 11, when the amount of molten glass in the crucible 1 decreases, the combustion amount of the upper gas burner B among the 27 gas burners B is set to be higher than the combustion amount of the other gas burners B. By reducing, it can avoid that the upper side part of the crucible 1 in which molten glass does not exist is heated to high temperature, and can suppress that a crack generate | occur | produces in the crucible 1 appropriately.

  In the fourth embodiment, the gas burners B are provided in a state where nine gas burners B are assigned to the positions corresponding to both the lateral sides, the back, and the bottom of the crucible 1, but the lateral sides of the crucible 1 The number of gas burners B provided at positions corresponding to the back and bottom can be variously changed according to the size of the crucible 1.

[Another embodiment]
Next, another embodiment is listed.
(1) In the first to fourth embodiments, the case where the gas burner B is provided at a position corresponding to both the lateral sides of the crucible 1 is illustrated, but one of the pair of lateral sides of the crucible 1 You may implement with the form which provides the gas burner B only in the position corresponding to.

(2) In the said 3rd Embodiment, although the case where the gas burner B was provided in the position corresponding to the front part and bottom part of the crucible 1 was illustrated, gas burner B provided in the position corresponding to the front part of the crucible 1 is shown. You may implement by the form which abbreviate | omits.

(3) In the fourth embodiment, a single or multiple gas burners B may be provided at a position corresponding to the front portion of the crucible 1, and in this case, a position corresponding to the bottom portion of the crucible 1. You may implement by the form which abbreviate | omits the gas burner B provided in this.

(4) In the first to third embodiments, the case where the air preheating heat exchanger 6 for preheating the combustion air E supplied to the gas burner B is illustrated, but the air preheating heat exchanger 6 is provided. You may implement by the form which abbreviate | omits.

(5) In the fourth embodiment, the case where the air preheating heat exchanger 6 for preheating the combustion air E supplied to the gas burner B is omitted is exemplified, but the air preheating heat exchanger 6 is provided. May be implemented.

(6) In the first to fourth embodiments, the case where the gas burner B forms a skirt-like combustion flame as the planar combustion flame F is exemplified, but the gas burner B is used as the planar combustion flame F. You may implement with the form which forms a flat combustion flame.

DESCRIPTION OF SYMBOLS 1 Crucible 2 Furnace wall part A Furnace body B Gas burner E Combustion air F Planar combustion flame G Fuel gas H Combustion amount adjustment means

Claims (9)

A single cat-shaped crucible for melting glass is placed inside the furnace body,
A gas burner for burning the fuel gas to heat the crucible is a single glass melting furnace equipped on the furnace wall of the furnace body,
The gas burner completely burns the fuel gas in a state in which the fuel gas and combustion air are jetted to the front side of the burner so as to expand in the radial direction over the entire circumference in the circumferential direction to form a planar combustion flame. Composed of
A plurality of the gas burners are positioned in a position excluding the upper part of the periphery of the crucible in a state where the crucible is positioned on the front side of the burner and the planar combustion flame is positioned so as to burn away from the crucible. Single kiln for melting glass that is distributed.   The single furnace for melting glass according to claim 1, wherein the gas burner is configured to form a skirt-like combustion flame that expands in a radial direction toward the front side of the combustion flame as the planar combustion flame.   The single furnace for glass melting according to claim 1 or 2, wherein an air ratio of the gas burner is set in a range of 1.01 to 1.1.   The single furnace for glass melting of any one of Claims 1-3 in which the heat exchanger for the air preheating which preheats the said combustion air with the combustion exhaust gas discharged | emitted from the inside of the said furnace body is provided.   The single furnace for glass melting according to any one of claims 1 to 4, wherein the gas burner is provided at a position corresponding to a lateral side portion and a back portion of the crucible.   The single furnace for melting glass according to claim 5, wherein the gas burner is provided at a position corresponding to both lateral sides of the crucible.   The single furnace for glass melting according to claim 5 or 6, wherein the gas burner is provided at a position corresponding to a front portion of the crucible.   The single furnace for glass melting according to any one of claims 5 to 7, wherein the gas burner is provided at a position corresponding to a bottom portion of the crucible.   The single furnace for glass melting according to any one of claims 1 to 8, wherein combustion amount adjusting means for adjusting the combustion amount of each of the plurality of gas burners is provided.

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