JP6124643B2 - Glass melting furnace - Google Patents

Description

  In the present invention, the submerged combustion-type heating burner that injects and burns a combustible gas and an oxygen-containing gas forms a combustion flame inside the molten glass of the glass melting tank and burns the glass melting tank. It is related with the glass melting furnace equipped with the wall part.

  Since such a glass melting furnace heats the molten glass in the glass melting tank with a submerged combustion type heating burner, the combustion heat of the combustion flame of the heating burner can be efficiently transmitted to the molten glass, The combustion gas of the combustible gas and the oxygen-containing gas flows through the inside of the molten glass, thereby providing an advantage that the molten glass can be melted satisfactorily by exerting an action of stirring the molten glass.

  By the way, when heating the molten glass for melting, the molten glass may be heated only with a submerged combustion type burner, but combustible gas and oxygen are directed toward the space above the molten glass. An upper burner that jets and burns the contained gas may be provided, and the molten glass may be heated by the submerged combustion type heating burner and the upper burner.

  As a conventional example of such a glass melting furnace, there is a bottom wall portion as a wall portion of a glass melting tank equipped with a submerged combustion type heating burner, and the heating burner forms a flame extending elongated upward. (For example, refer patent document 1).

  In Patent Document 1, an inlet for supplying a gas such as oxygen or air to the inside of the molten glass is provided on the side of the heating burner so that the flame formed by the heating burner appears as bubbles from the heating burner. The action such as promoting the withdrawal is obtained.

Special table 2008-528424 gazette

  In a conventional glass melting furnace, a submerged combustion type heating burner is configured to burn in a state of forming a flame extending elongated upward, but in this case, the glass to be charged into the glass melting tank If the type and amount of the raw material are changed, there is a possibility that it is difficult to heat the molten glass appropriately, and improvement is desired.

  That is, the solubility of the glass raw material put into the glass melting tank is not uniform, there are those that are hardly soluble and those that are easily soluble. It is necessary to increase the amount of heat applied to the glass.

In addition, when the amount of glass raw material input is large (when the amount of glass production is large), the amount of glass raw material input is It is necessary to increase the amount of heat applied to the molten glass as compared to when it is small (when the production amount of glass is small).
Furthermore, in the case of producing colored glass, it is necessary to increase the amount of heat given to the molten glass in the order of black, patina and transparent.

  As described above, when the type and amount of the glass raw material charged into the glass melting tank change, it is necessary to adjust the amount of heat given to the molten glass, but the submerged combustion type equipped in the conventional glass melting furnace is necessary. Since the heating burner always burns in a state of forming a flame extending elongated upward, it is difficult to appropriately adjust the amount of heat applied to the molten glass.

  In other words, in the submerged combustion type heating burner equipped in the conventional glass melting furnace, the amount of heat given to the molten glass is adjusted by adjusting the amount of combustion, but only the amount of combustion is adjusted. Then, it is difficult to appropriately adjust the amount of heat given to the molten glass within a large range, and improvement has been desired.

  The present invention has been made in view of the above circumstances, and its purpose is to appropriately adjust the amount of heat given to the molten glass in accordance with the change in the type and amount of glass raw material charged into the glass melting tank. The object is to provide a glass melting furnace.

In the glass melting furnace of the present invention, a submerged combustion type burner that burns by combusting a combustible gas and an oxygen-containing gas forms a combustion flame inside the molten glass of the glass melting tank and burns. It is equipped with the wall part of the glass dissolution tank, and its first characteristic configuration is:
The heating burner is
A central air ejection portion that ejects combustion air as the oxygen-containing gas toward the tip side; and
A fuel ejection part that ejects the combustible gas from the periphery of the central air ejection part toward the tip side; and
An outer peripheral air ejection portion that ejects the combustion air in a swirling state from a radially outer side location toward a radially inner side than the fuel ejection portion;
Proximal cylindrical portion on the base end side that guides the combustion air ejected from the central air ejection portion and the outer peripheral air ejection portion and the combustible gas ejected from the fuel ejection portion toward the distal end side. A guide portion configured in a form in which a diameter-expanded portion that gradually increases in diameter toward the distal end side is connected to the distal end side,
An ejection ratio adjusting means for changing a ratio between an ejection amount of the combustion air from the central air ejection portion and an ejection amount of the combustion air from the outer peripheral air ejection portion;
By changing the ratio by the ejection ratio adjusting means, the form of the combustion flame is a flat flame that expands in the radial direction without extending to the front end side, a skirt-like flame that expands in the radial direction on the front end side of the combustion flame, or a straight advance while turning. It is characterized in that it can be changed to a toroidal flame extending in a straight line and a straight flame extending straight in a non-turning state.

That is, the heating burner has a flat flame that expands in the radial direction without extending toward the tip side, a skirt-like flame that expands in the radial direction toward the tip side of the combustion flame, a toroidal flame that extends straight while turning, and Thus, it can be changed to a straight flame that extends straight in a non-turning state.
And the flat flame, the skirt flame, the toroidal flame, and the straight flame tend to increase the amount of heat given to the molten glass in this order of description.

  Therefore, it is possible to adjust the amount of heat given to the molten glass to an appropriate amount of heat by changing the form of the combustion flame of the heating burner according to changes in the type and amount of glass raw material charged into the glass melting tank. It becomes.

In short, according to the first characteristic configuration of the present invention, it is possible to provide a glass melting furnace capable of appropriately adjusting the amount of heat given to the molten glass in accordance with changes in the type and amount of the glass raw material charged into the glass melting tank.
Further, according to the first characteristic configuration of the present invention, the ratio of the amount of combustion air ejected from the center side air ejecting portion and the amount of combustion air ejected from the front outer peripheral side air ejecting portion by the ejection ratio adjusting means. By changing the heating flame, the form of the combustion flame of the heating burner can be changed to flat flame, skirt flame, toroidal flame, and straight flame, so the amount of heat given to the molten glass can be appropriately adjusted over a sufficiently large range. You can adjust it.
Therefore, even if the solubility of the glass raw material put into the glass melting tank greatly fluctuates or the amount of glass raw material charged into the melting tank (the amount of glass production) may fluctuate greatly, In addition, the amount of heat given to the molten glass can be adjusted appropriately.
In addition, when producing colored glass, regardless of whether black, patina, or transparent is produced, the amount of heat applied to the molten glass can be appropriately adjusted according to the colored glass to be produced.
In short, according to the first characteristic configuration of the present invention, it is possible to provide a glass melting furnace capable of appropriately adjusting the amount of heat given to the molten glass over a sufficiently large range in addition to the above-described effects.

In addition to the first feature configuration, the second feature configuration of the glass melting furnace of the present invention,
Inside the glass melting tank, an upstream circulating flow on the glass raw material charging side that circulates up and down in a form in which the upper layer of the molten glass flows to the front side of the melting tank, and the upper layer of the molten glass is the melting tank A downstream circulating flow on the molten glass extraction side that circulates up and down in a form that flows to the rear side is formed,
The heating burner is characterized in that it is configured to burn in a state where the combustion flame is formed in a portion of the molten glass where the upstream circulation flow is formed.

  That is, when the molten glass inside the glass melting tank is heated, the upper part of the molten glass is circulated up and down in a form in which the upper layer of the molten glass flows to the front side of the melting tank. A downstream circulating flow on the molten glass take-off side that circulates up and down in a form in which the upper layer portion of the flow and the molten glass flows to the rear side of the melting tank is formed.

  The portion of the inside of the glass melting tank where the upstream circulation flow is formed corresponds to a melting zone for melting the glass raw material charged in the glass melting tank, and the downstream circulation of the inside of the glass melting tank. The portion where the flow is formed corresponds to a clarification zone for discharging bubbles and the like from the molten glass.

  That is, the glass raw material charged to the front side of the glass melting tank melts while flowing along the upstream circulation flow in the melting zone, and then flows into the clarification zone along the downstream circulation flow. It is clarified while flowing, and after clarification, it is taken out to the working tank outside the dissolution tank through the neck.

By the way, when the upstream side circulation flow is accurately described including the flow of the lower layer part of the molten glass, the upper side circulation flow is such that the upper layer part of the molten glass flows to the front side of the melting tank and the lower layer part is the rear part of the melting tank. It will circulate up and down in a form that flows along the direction toward the side.
Further, when the downstream circulating flow is accurately described including the flow of the lower layer portion of the molten glass, the upper circulating portion of the molten glass flows to the rear side of the melting tank and the lower layer portion is the front of the melting tank. It will circulate up and down in the form of flowing along the direction toward the side.

  In the second characteristic configuration, the heating burner is configured to burn in a state in which a combustion flame is formed in a portion of the inside of the molten glass where the upstream circulation flow is formed. In the zone, the molten glass flowing along the upstream side circulation flow can be satisfactorily heated by a submerged combustion type heating burner.

  By the way, the part of the inside of the molten glass where the downstream circulation flow is formed, that is, the clarification zone is not equipped with a submerged combustion type burner so that the molten glass can be clarified well. Will be.

  That is, according to the second characteristic configuration, the molten glass is efficiently heated by the submerged combustion type burner in the melting zone in the molten glass where it is desired to efficiently apply heat to the molten glass. It can be done.

  In short, according to the second characteristic configuration of the present invention, in addition to the function and effect of the first characteristic configuration, the molten glass is efficiently heated by the submerged combustion heating burner in the melting zone inside the molten glass. The glass melting furnace which can be provided can be provided.

In addition to the first or second feature configuration, the third feature configuration of the glass melting furnace of the present invention,
The heating burner is provided on a bottom wall portion as the wall portion.

  That is, since the heating burner is provided on the bottom wall of the glass melting tank, the melting located near the bottom wall of the glass melting tank is caused by the combustion flame formed near the bottom wall of the glass melting tank. The glass can be heated, and in addition, the intermediate layer portion and the upper layer portion in the depth direction of the molten glass can be heated by the upward flow of the flue gas of the combustion flame as bubbles.

  That is, the lower layer part, intermediate | middle layer part, and upper layer part of the molten glass located inside a glass melting tank can be favorably heated with a heating burner.

  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, the lower layer portion, the intermediate layer portion, and the upper layer portion of the molten glass located inside the glass melting tank. It is possible to provide a glass melting furnace that can be heated satisfactorily.

In addition to the first or second feature configuration, the fourth feature configuration of the glass melting furnace of the present invention,
The heating burner is characterized in that it is provided on a lateral side wall as the wall.

  That is, since the heating burner is provided on the side wall of the glass melting tank, the melting located near the side wall of the glass melting tank is caused by the combustion flame formed near the side wall of the glass melting tank. The glass can be heated, and in addition, the portion of the molten glass positioned above the heating burner can also be heated by causing the combustion exhaust gas of the combustion flame to rise and flow as bubbles.

  That is, it is possible to appropriately heat the molten glass located near the lateral side wall portion of the glass melting tank by the heating burner, and in addition, to heat the molten glass located above the location where the heating burner is installed. Can do.

  In short, according to the fourth feature configuration of the present invention, in addition to the operational effects of the first or second feature configuration, the molten glass located near the side wall portion of the glass melting tank, and the installation location of the heating burner It is possible to provide a glass melting furnace capable of favorably heating the molten glass positioned on the upper side.

In addition to any of the first to fourth feature configurations described above, the fifth feature configuration of the glass melting furnace of the present invention,
The heating burner is configured to eject the combustible gas and the oxygen-containing gas in an unmixed state.

  That is, since the heating burner is configured to eject the combustible gas and the oxygen-containing gas in an unmixed state, the ejected combustible gas and the oxygen-containing gas are mixed and burned after the ejection. become.

  Thus, the combustible gas and the oxygen-containing gas are mixed and burned after being ejected from the heating burner, in other words, because they are burned by the so-called premixing method, It can be burned satisfactorily while the generation is suppressed.

  In short, according to the fifth feature configuration of the present invention, in addition to the operational effects of the first to fourth feature configurations, the glass melting furnace capable of successfully burning the heating burner in a state in which the occurrence of flashback is suppressed. Can provide.

In addition to any of the first to fourth feature configurations described above, the sixth feature configuration of the glass melting furnace of the present invention is as follows.
The heating burner is configured to eject the combustible gas and the oxygen-containing gas in a mixed state.

  That is, since the heating burner is configured to eject the combustible gas and the oxygen-containing gas in a mixed state, the combustible gas and the oxygen-containing gas to be ejected are already mixed when ejected. Therefore, it will burn accurately as it is ejected.

  In this way, since the combustible gas and the oxygen-containing gas are jetted from the heating burner in a mixed state and burned, in other words, burned by the so-called original mixing method, Although it is burned in a state where a combustion flame is formed inside, it can be burned well in a state where unexpected fire extinguishing is avoided.

  When combustible gas and oxygen-containing gas are jetted from a heating burner and burned in a mixed state, a combustion flame is also present at the inner surface of the wall of the glass melting tank or at a site very close to the wall. Thus, there is also an advantage that the molten glass adjacent to the wall portion can be appropriately heated.

  In short, according to the sixth feature configuration of the present invention, in addition to the operational effects of the first to fourth feature configurations, glass melting that can be satisfactorily combusted in a state that avoids unexpectedly extinguishing the heating burner. A furnace can be provided.

Vertical side view of glass melting furnace Cross section of glass melting furnace Vertical side view of the first burner IV-IV line sectional view in FIG. Vertical side view of the second burner Sectional view taken along line VI-VI in FIG. The figure which shows the form of the combustion flame of a 2nd burner Vertical side view showing a glass melting furnace of another embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Overall configuration of glass melting furnace)
As shown in FIG.1 and FIG.2, the glass melting furnace is equipped with the substantially sealed glass melting tank 1 comprised using the refractory brick etc., and the rear side of this glass melting tank 1 is similarly provided. The work tank 2 comprised using refractory bricks etc. is equipped.
In the front part of the glass melting tank 1, a raw material charging port 3 for feeding the glass raw material is formed, and in the upper part of the rear part of the glass melting tank 1, the molten glass inside the glass melting tank 1 is put into the work tank 2. A leading outlet 4 is formed.

In the present embodiment, a plurality of first burners N are provided in the middle part of the glass melting tank 1, and a plurality of second burners M are provided in the front part of the glass melting tank 1. N and a plurality of second burners M are configured to heat the molten glass (glass raw material) inside the glass melting tank 1.
Although details of the first burner N and the second burner M will be described later, the first burner N and the second burner M are liquids that burn in a state in which the combustion flames Fn and Fm are formed inside the molten glass. Medium combustion type.

  Inside the glass melting tank 1, a glass raw material that circulates up and down in a form in which the upper layer of the molten glass flows toward the front of the melting tank and the lower layer of the molten glass flows along the direction toward the rear of the melting tank The upstream circulating flow Ju on the charging side and the upper part of the molten glass flow up and down in the form of flowing along the direction toward the melting tank front and the lower part of the molten glass flows toward the front of the melting tank. A downstream circulating flow Jd on the molten glass take-out side is formed.

  That is, by heating the molten glass (glass raw material) inside the glass melting tank 1 by the first burner N and the second burner M, the front side portion of the glass melting tank 1 is located upstream of the glass raw material charging side. A circulating flow Ju is formed, and a downstream circulating flow Jd on the molten glass take-out side is formed in the rear side portion of the glass melting tank 1.

  The portion of the inside of the glass melting tank 1 where the upstream circulating flow Ju is formed corresponds to the melting zone A for melting the glass raw material charged into the glass melting tank 1. The portion where the downstream circulating flow Jd is formed corresponds to the clarification zone B in which bubbles and the like are discharged from the molten glass.

  That is, the glass raw material charged to the front side of the glass melting tank 1 is melted while flowing along the upstream circulation flow Ju in the melting zone A, and then flows into the clarification zone B to be circulated downstream. It is clarified while flowing along the flow Jd, and after clarification, it is taken out to the work zone D equipped with the work tank 2 through the neck C in which the discharge port 4 is formed.

(Installation configuration of the first burner)
The first burner N is a submerged combustion burner that ejects a fuel gas G such as a city gas mainly composed of LPG and methane as a combustible gas and a combustion air E as an oxygen-containing gas, The wall of the glass melting tank 1 is equipped with a combustion flame Fn in the glass melting tank 1 so as to burn.
Incidentally, the combustion flame Fn of the first burner N is a long and narrow combustion flame, and the combustion exhaust gas after combustion rises in the form of bubbles into the molten glass and then flows into the upper space of the molten glass. become.

  In the present embodiment, as the first burner N, the first bottom wall burner Nt equipped on the bottom wall 1t as the wall of the glass melting tank 1 and the lateral side wall 1s as the wall of the glass melting tank 1 are used. And a first side wall burner Ns which is equipped with.

  Then, the first bottom wall burner Nt and the first side wall burner Ns are connected to the upstream circulation flow Ju and the downstream in order to prevent the molten glass flowing along the upstream circulation flow Ju from flowing into the downstream circulation flow Jd. The fuel gas G and the combustion air E are jetted from the portion corresponding to the side circulation flow Jd to the dissolution tank front side.

  That is, the fuel gas G and the combustion air E are placed at a position corresponding to the first bottom wall burner Nt between the upstream circulation flow Ju and the downstream circulation flow Jd in the bottom wall portion of the glass melting tank 1. It is provided in a state in which it is ejected toward the direction toward the upper side of the dissolution tank front side.

Further, the first side wall burner Ns is located on the lower side of the side wall portion of the glass melting tank 1 and at a position corresponding to the space between the upstream side circulation flow Ju and the downstream side circulation flow Jd. Are ejected toward the front side of the melting tank and inward in the lateral width direction of the glass melting tank and toward the upper side.
Incidentally, in this embodiment, the 1st side wall burner Ns is equipped in the height equivalent to 1/3 of the depth of a molten glass from the bottom wall part 1t of the glass melting tank 1. FIG.

  That is, the fuel gas ejected from the first bottom wall burner Nt and the first side wall burner Ns and the combustion air flow the molten glass flowing along the lower layer portion of the upstream circulation flow Ju on the melting tank front side and Since the fluid is pressed and flowed upward, the molten glass flowing along the upstream circulation flow Ju is prevented from flowing into the clarification zone B where the downstream circulation flow Jd is present. The molten glass is sufficiently melted in step (b).

(Specific configuration of the first burner)
The first bottom wall burner Nt and the first side wall burner Ns are configured in the same manner, and the specific configuration thereof will be described below using the first bottom wall burner Nt as a representative.

  As shown in FIGS. 3 and 4, the first bottom wall burner Nt is configured to include a double tube with an inner tube 5 and an outer tube 6, and further, on the outer side of the outer tube 6, a cooling jacket K <b> 1. A cylindrical body 7 is formed to form a triple-tubular shape including the cylindrical body 7.

A fuel gas G is supplied to the inner cylinder 5, and a fuel outlet 8 is formed at the tip of the inner cylinder 5.
Combustion air E is supplied to a space surrounded by the inner cylinder 5 and the outer cylinder 6, and a plurality of air jets 9 are provided between the tip of the inner cylinder 5 and the outer cylinder 6 in the circumferential direction. A ring-shaped plate 10 formed in an aligned state is disposed.

  A front protruding portion 6A that protrudes further forward than the front end of the inner cylinder 5 in the outer cylinder 6 is formed to have a smaller diameter toward the front side so as to promote mixing of the fuel gas G and the combustion air E. It is configured.

That is, the first bottom wall burner Nt is configured to eject the fuel gas G and the combustion air E in an unmixed state toward the mixing space formed inside the front protruding portion 6A.
The ejected fuel gas G and combustion air E are mixed in the mixing space, and then flow forward and burn.

  Incidentally, the cooling jacket K1 is configured to cool the outer cylinder 6 and the inner cylinder 5 by allowing the cooling water W to flow through the space between the outer cylinder 6 and the cylinder 7.

  Although not described in detail, the injection amount of the fuel gas G from the fuel injection port 8 and the injection amount of the combustion air E are configured to be freely adjustable, and the combustion amount of the first bottom wall burner Nt is reduced by glass melting. It will be changed according to the type and amount of glass raw material charged into the tank.

(Installation configuration of second burner)
The second burner M is a submerged combustion-type heating burner that ejects fuel gas G such as LPG and city gas mainly composed of methane as combustible gas and combustion air E as oxygen-containing gas. And it is equipped in the wall part of the glass melting tank 1 in the state which forms the combustion flame Fm inside the glass melting tank 1 and burns.

In addition, the second burner M has a form of the combustion flame Fm, a flat flame that expands in the radial direction without extending toward the tip side, a skirt-like flame that expands in the radial direction toward the tip side of the combustion flame, and a straight flame that extends while turning. It is comprised so that it can change into four types of forms which consist of a toroidal flame and the straight flame which extends straightly in a non-turning state (refer FIG. 7).
Incidentally, the combustion exhaust gas after combustion becomes bubbles and rises inside the molten glass and then flows into the upper space of the molten glass.

  In the present embodiment, as the second burner M, the second bottom wall burner Mt equipped on the bottom wall portion 1t as the wall portion of the glass melting tank 1 and the side wall portion 1s as the wall portion of the glass melting tank 1 are used. And a second side wall burner Ms.

And the 2nd bottom wall burner Mt and the 2nd side wall burner Ms are comprised so that it may burn in the state which forms the combustion flame Fm in the part in which the upstream side circulation flow Ju is formed among the insides of molten glass. ing.
That is, the second bottom wall burner Mt and the second side wall burner Ms heat the molten glass in the melting zone A, and the second bottom wall burner Mt and the second side wall burner Ms form the combustion flame Fm. Is changed to four kinds of forms consisting of a flat flame, a skirt flame, a toroidal flame, and a straight flame, the amount of heat given to the molten glass can be appropriately adjusted over a sufficiently large range.
That is, flat flames, skirt flames, toroidal flames, and straight flames tend to increase the amount of heat applied to the molten glass in this order of description.

Therefore, even if the solubility of the glass raw material put into the glass melting tank greatly fluctuates or the amount of glass raw material charged into the melting tank (the amount of glass production) may fluctuate greatly, In addition, the amount of heat applied to the molten glass can be appropriately adjusted by changing the form of the combustion flame Fm.
Moreover, in the case of producing colored glass, in any case of producing black, patina, or transparent, it is given to the molten glass by changing the form of the combustion flame Fm according to the colored glass to be produced. The amount of heat can be adjusted appropriately.

(Specific configuration of the second burner)
The second bottom wall burner Mt and the second side wall burner Ms are configured in the same manner, and the specific configuration thereof will be described below with the second bottom wall burner Mt as a representative.

As shown in FIGS. 5 and 6, the second bottom wall burner Mt includes a burner tile 13 installed in a state of being fitted in a mounting hole 12 formed in the bottom wall portion 1 t of the glass melting tank 1, and the burner tile. 13 is composed of a burner main body 14 assembled to 13.
The burner tile 13 is formed in a cylindrical shape and has a tip portion forming a morning glory-shaped guide surface Q.
The burner body 14 includes a proximal end portion 14A located outside the burner tile 13 and a distal end portion 14B fitted to the burner tile 13.

  Inside the base end side portion 14A of the burner main body portion 14, there is an air supply tube 15 at the center, a fuel supply tube 16 disposed so as to cover the periphery of the air supply tube 15, and the fuel supply tube 16. A swirling air ejection cylinder 17 arranged in a state of covering the periphery is provided, and an air chamber 18 is formed at an outer peripheral side portion of the swirling air ejection cylinder 17.

  Then, a part of the combustion air E supplied from the blower blower U is guided 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 base end side portion 14A, and the air supply tube 15 From the second air supply port 19B, the remaining portion of the combustion air E supplied from the blower blower U is formed in the side portion of the base end side portion 14A. It is guided to the chamber 18 and is ejected in a swirling state into a 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. ing.

  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, after the fuel gas G supplied from the fuel supply port 21 formed in the base end side portion 14 </ b> A is guided to the space between the air supply cylinder 15 and the fuel supply cylinder 16, the distal end portion of the fuel supply cylinder 16 It is configured to be ejected from the fuel ejection port 22 formed in the above.

  Further, the front end portion 14B of the burner main body 14 includes a guide cylinder 23 in a state of being connected to the swirling air ejection cylinder 17 and an outer cylinder 24 for forming a cooling jacket K2 on the outer periphery of the guide cylinder 23. It is configured in a double tubular shape and is fitted to the burner tile 13.

  The inside of the guide cylinder 23 includes combustion air E ejected from the air supply cylinder 15, combustion air E supplied in a swirling state from the swirling air ejection cylinder 17, and fuel injection at the tip of the fuel supply cylinder 16. It functions as a mixing space for mixing the fuel gas G ejected from the outlet 22.

  Incidentally, the cooling jacket K <b> 2 is configured to cool the guide cylinder 23, the outer cylinder 24, and the like by allowing the cooling water W to flow through the space between the guide cylinder 23 and the outer cylinder 24.

  Accordingly, the second bottom wall burner Mt includes 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 at the tip of the fuel supply cylinder 16. The fuel gas G ejected from the ejection port 22 is mixed in the mixing space inside the guide tube 23, and the mixed gas mixed in the mixing space is applied to the morning glory-shaped guide surface Q at the tip of the burner tile 13. It is comprised so that it may combust in the state which forms the combustion flame Fm, guiding along.

  That is, the second bottom wall burner Mt ejects the fuel gas G and the combustion air E in an unmixed state toward the mixing space inside the guide cylinder 23, and the fuel gas G inside the guide cylinder 23. And combustion air E are mixed and combusted.

  The first flow path R1 connecting the blower blower U and the first air supply port 19A is provided with a first orifice 26A and an adjustment damper 27 for adjusting the air flow rate, and the blower blower U and the second air supply are provided. The second flow path R2 connecting the port 19B is provided with a second orifice 26B. By adjusting the opening of the adjustment damper 27, the supply amount of the combustion air E supplied to the first air supply port 19A The ratio with the supply amount of the combustion air E supplied to the second air supply port 19B is changed.

Therefore, the second bottom wall burner Mt adjusts the opening degree of the adjustment damper 27 to supply the combustion air E supplied to the first air supply port 19A and the combustion air E supplied to the second air supply port 19B. By changing the ratio with the supply amount, the form of the combustion flame Fm is changed to a flat flame (see FIG. 7A), a skirt flame (see FIG. 7B), and a toroidal flame (see FIG. 7C). ) And a straight flame (see FIG. 7 (D)).
The flat flame is in a state where the combustion flame Fm adheres to the burner tile 13 and the bottom wall 1t, and the skirt flame is different in that the combustion flame Fm is separated from the burner tile 13 and the bottom wall 1t. To do.

  Incidentally, in the present embodiment, the central air ejection part for ejecting combustion air toward the tip side is configured by the air supply cylinder 15, and the combustible gas is moved from the periphery of the center side air ejection part to the tip side. The fuel ejection portion that is ejected toward the outside is configured by the fuel ejection port 22, and the outer peripheral side air that ejects the combustion air in a swirling state from the radially outer side location toward the radially inner side than the fuel ejection portion. The ejection part is configured by the swirling air ejection hole 20.

Further, in the present embodiment, the base end side that guides the combustion air ejected from the center side air ejecting portion and the outer peripheral side air ejecting portion and the combustible gas ejected from the fuel ejecting portion toward the distal end side. A guide portion V configured to have a configuration in which a diameter-expanded portion that gradually increases in diameter toward the distal end side is connected to the distal end side of the right cylindrical portion is configured from the guide cylinder 23 and the burner tile 13.
That is, the base cylindrical portion on the base end side is configured by the guide tube 23, and the diameter-expanded portion that gradually increases in diameter toward the distal end is configured by the guide surface Q of the burner tile 13.

Further, in the present embodiment, the amount of combustion air E ejected from the air supply cylinder 15 as the central air ejecting portion and the combustion air E ejected from the swirling air ejection hole 20 as the outer peripheral air ejecting portion. The ejection ratio adjusting means T that changes the ratio to the amount is configured with the adjustment damper 27 as a main part.
And by the change of the said ratio by the ejection ratio adjustment means T, as mentioned above, the form of the combustion flame Fm is changed into a flat flame, a skirt flame, a toroidal flame, and a straight flame.

  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 combustion flame Fm becomes a flat flame and swirls. When 50 to 90% of the combustion air E is ejected from the air ejection hole 20 and the remaining combustion air E is ejected from the air supply cylinder 15, the form of the combustion flame Fm becomes a skirt-like flame, and the swirling air ejection When 40 to 50% of the combustion air E is ejected from the hole 20 and the remainder of the combustion air E is ejected from the air supply cylinder 15, the form of the combustion flame Fm becomes a toroidal flame, and further, the swirling air ejection hole 20 When 0 to 40% of the combustion air E is ejected from and the remainder of the combustion air E is ejected from the air supply cylinder 15, the form of the combustion flame Fm becomes a straight flame.

  Although not described in detail, the fuel gas G ejection amount and the combustion air E ejection amount from the fuel ejection port 22 can be changed and adjusted, in addition to changing the form of the combustion flame Fm. The amount of combustion is also changed.

  As described above, the glass melting furnace of the present embodiment is the molten glass in the melting zone A with the second burner M that can change the form of the combustion flame Fm to a flat flame, a skirt flame, a toroidal flame, and a straight flame. Therefore, by changing the form of the combustion flame Fm according to the type and amount of the glass raw material charged into the glass melting tank 1, the amount of heat given to the molten glass is adjusted appropriately. The molten glass in zone A can be heated well.

  Moreover, the first burner N is interposed between the upstream circulation flow Ju and the downstream circulation flow Jd in order to suppress the molten glass flowing along the upstream circulation flow Ju from flowing into the downstream circulation flow Jd. Since the fuel gas and the combustion air are ejected from the corresponding part to the front side of the melting tank, the molten glass flowing along the upstream circulating flow Ju in the melting zone A has the downstream circulating flow Jd. The molten glass can be sufficiently melted (melted) by suppressing the flow to the clarification zone B.

  In addition, by not installing the first burner N and the second burner M in the clarification zone B, it is possible to improve the clarification of the molten glass so that no bubbles are generated inside the molten glass. It is configured.

[Another embodiment]
Next, another embodiment is listed.
(A) In the above embodiment, the molten glass inside the glass melting tank 1 is heated by the first burner N as the submerged combustion burner and the second burner M as the submerged combustion type heating burner. Although comprised as mentioned above, you may implement with the form which provides the upper burner which injects and burns a combustible gas and oxygen-containing gas to the upper space of a molten glass.

(B) In the above-described embodiment, the first burner N that exhibits an action of suppressing the molten glass flowing along the upstream circulation flow Ju from flowing into the downstream circulation flow Jd is provided. You may implement in the form which abbreviate | omits installation of the burner N.

(C) In the above embodiment, as the second burner M as a submerged combustion type heating burner, the second bottom wall burner Mt equipped on the bottom wall 1t of the glass melting tank 1 and the side of the glass melting tank 1 Although the case where the second side wall burner Ms equipped on the side wall 1s is installed is illustrated, for example, only the second bottom wall burner Mt is installed, or only the second side wall burner Ms is installed. It is not always necessary to install the second bottom wall burner Mt and the second side wall burner Ms.

(D) In the above embodiment, the first burner N as a submerged combustion burner and the second burner M as a submerged combustion type burner are in a non-mixed state of a combustible gas and an oxygen-containing gas. However, even if the first burner N and the second burner M are configured to jet the combustible gas and the oxygen-containing gas in a mixed state, the first burner N and the second burner M may be jetted in a mixed state. Good.

  Incidentally, as a configuration for injecting a combustible gas and an oxygen-containing gas in a mixed state, for example, in the case of providing a blower that supplies combustion air as an oxygen-containing gas, the combustible gas is introduced into the air intake passage of the blower. It is possible to adopt a form that allows ejection.

In the first burner N as the submerged combustion burner, in the configuration described in the embodiment, the mixed gas is supplied instead of the combustion air E. In this case, the fuel supply is omitted. Become.
Further, in the second burner M as the submerged combustion type heating burner, the mixed gas is supplied to the air supply port 19 instead of the combustion air E in the configuration described in the embodiment. In this case, fuel supply to the fuel supply port 21 is omitted.

(E) In the above embodiment, the glass melting tank 1 is illustrated in the form in which the discharge port 4 is formed in the upper part of the rear part of the tank, but as shown in FIG. The present invention can be applied to various forms of the glass melting tank 1 such as the glass melting tank 1 in which the discharge port 4 is formed at the side portion.

Incidentally, in the glass melting tank 1 of FIG. 8, a weir 25 is formed at a location corresponding to the upstream wall Ju and the downstream circulation flow Jd in the bottom wall portion 1t.
In FIG. 7, the first bottom wall burner Nt is equipped as the first burner N, and the second bottom wall burner Mt is equipped as the second burner M.

(F) In the above embodiment, the combustion air E is exemplified as the oxygen-containing gas, but pure oxygen gas can be used as the oxygen-containing gas.

(G) Oite to the above-described type state is ejected ratio adjusting device T is, a case has been exemplified comprised a control damper 27 which is equipped with the first flow path R1 as a main unit, for example, the first flow path R1 Further, the specific configuration of the ejection ratio adjusting means T can be changed in various ways, for example, a flow rate adjusting damper is provided in each of the second flow paths R2.

DESCRIPTION OF SYMBOLS 1 Glass melting tank 1s Horizontal side wall part 1t Bottom wall part 15 Center side air ejection part 20 Outer peripheral side air ejection part 22 Fuel ejection part E Oxygen containing gas G Combustible gas Fm Combustion flame Jd Downstream circulating flow Ju Upstream circulating flow T Ejection ratio adjusting means V guide section

Claims (6)

A submerged combustion-type heating burner that burns by combusting a combustible gas and an oxygen-containing gas forms a combustion flame inside the molten glass of the glass melting tank and burns in the state of the glass melting tank. An equipped glass melting furnace,
The heating burner is
A central air ejection portion that ejects combustion air as the oxygen-containing gas toward the tip side; and
A fuel ejection part that ejects the combustible gas from the periphery of the central air ejection part toward the tip side; and
An outer peripheral air ejection portion that ejects the combustion air in a swirling state from a radially outer side location toward a radially inner side than the fuel ejection portion;
Proximal cylindrical portion on the base end side that guides the combustion air ejected from the central air ejection portion and the outer peripheral air ejection portion and the combustible gas ejected from the fuel ejection portion toward the distal end side. A guide portion configured in a form in which a diameter-expanded portion that gradually increases in diameter toward the distal end side is connected to the distal end side,
An ejection ratio adjusting means for changing a ratio between an ejection amount of the combustion air from the central air ejection portion and an ejection amount of the combustion air from the outer peripheral air ejection portion;
By changing the ratio by the ejection ratio adjusting means, the form of the combustion flame is a flat flame that expands in the radial direction without extending to the front end side, a skirt-like flame that expands in the radial direction on the front end side of the combustion flame, or a straight advance while turning. A glass melting furnace configured to be able to be changed to a toroidal flame extending in a straight line and a straight flame extending straight in a non-turning state. Inside the glass melting tank, an upstream circulating flow on the glass raw material charging side that circulates up and down in a form in which the upper layer of the molten glass flows to the front side of the melting tank, and the upper layer of the molten glass is the melting tank A downstream circulating flow on the molten glass extraction side that circulates up and down in a form that flows to the rear side is formed,
The glass melting furnace according to claim 1, wherein the heating burner is configured to burn in a state where the combustion flame is formed in a portion of the molten glass where the upstream circulation flow is formed.   The glass melting furnace of Claim 1 or 2 with which the said heating burner is provided in the bottom wall part as said wall part.   The glass melting furnace of Claim 1 or 2 with which the said heating burner is provided in the side wall part as said wall part.   The glass melting furnace according to any one of claims 1 to 4, wherein the heating burner is configured to eject the combustible gas and the oxygen-containing gas in an unmixed state.   The glass melting furnace according to any one of claims 1 to 4, wherein the heating burner is configured to eject the combustible gas and the oxygen-containing gas in a mixed state.

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