JP2009120456A - Glass-melting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass-melting furnace capable of stably performing glass melting operation without depositing gall in a flue. <P>SOLUTION: The glass-melting furnace 11 is provided with a glass melting chamber 1 and the flue 20 for discharging waste gas G produced in the glass melting chamber 1. The flue 20 is provided with horizontal flue parts 3, 3' extending from the glass melting chamber 1 in the horizontal direction and vertical flue parts 4, 4' extending from respective horizontal flue parts 3, 3' in the vertical direction. The horizontal flue part 3' has a gall recovering duct 5 branched from the horizontal flue part 3' and extending downward and the bottom surfaces of the horizontal flue parts 3, 3' are inclined downward at inclined angles θ1, θ2 toward the gall recovering duct 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a glass melting furnace capable of stably performing a glass melting operation.

  In the conventional glass melting furnace 10 shown in FIG. 3, the exhaust gas G generated in the glass melting chamber 1 is discharged through the flue 2. The exhaust gas G includes scattered material of glass raw material, volatiles at the time of glass melting reaction, volatiles from melted glass dough, or sulfur content in the fuel used to dissolve the glass raw material. Some of these components contained in the exhaust gas G are mainly condensed and attached to the inner wall surface of the flue 2, but since the inside of the flue 2 is hot, this deposit becomes a viscous goal and smoke. Deposit on the bottom of the road 2. If the amount of accumulated goal increases and the flue gas flow path of the flue 2 becomes narrow, the pressure loss of the exhaust gas G fluctuates and hinders normal combustion. It is important to remove the goal that accumulates.

  In recent years, when the exhaust gas temperature coming out of the glass melting chamber is high in an oxycombustion glass melting furnace that has been used for melting glass, it is necessary to extend the flue to reduce the exhaust gas temperature in the flue. A flue structure having a long length is employed (see, for example, Non-Patent Document 1). In the oxyfuel furnace illustrated in Non-Patent Document 1, after exhaust gas is once guided downward, the exhaust gas is again guided upward and then discharged.

  In such a flue structure, for example, as shown in FIG. 4, in order to remove the goal D accumulated in the flue 2, an opening / closing part 7 and an opening / closing part 7 ′ are provided in the middle of the flue 2. The goal D accumulated periodically is removed from the opening / closing parts 7 and 7 '. Further, in Patent Document 1, in order to maintain the exhaust gas flow path in the flue, a cooling body is provided in the vertical flue to condense the components in the exhaust gas on the cooling surface, and this is provided in the middle of the flue. A glass melting kiln that can be recovered from the section in a condensate recovery container and discharged and removed outside the flue is described (for example, see Patent Document 1).

JP 2003-221237 A Masayuki Yamane, 6 others, “Glass Engineering Handbook”, Asakura Shoten, July 1999, p. 321

  However, in the flue structure shown in FIG. 4, the work of removing the goal D accumulated by opening the open / close portions 7 and 7 ′ provided in the middle of the flue 2 is performed by opening the middle of the flue 2. For this reason, the state of the flow of the exhaust gas G changes during work, and the furnace pressure in the glass melting chamber 1 fluctuates, which is an unstable factor in the glass melting operation. Further, since the work for removing the goal D from the inside of the flue 2 is a work under high heat, the burden on the worker is large and there is a problem in safety.

  Furthermore, in the glass melting furnace proposed in Patent Document 1, since the opening is opened in the middle of the flue to take out the goal, it is inevitable that the glass melting operation becomes unstable.

  Therefore, in view of the above problems, the inventor of the present application has earnestly studied in order to provide a glass melting furnace that can stably perform glass melting operation without depositing a goal in the flue, The present invention has been reached.

  That is, the glass melting kiln of the present invention includes a glass melting chamber for melting glass raw materials, and a flue for discharging exhaust gas generated in the glass melting chamber, and the flue is a horizontal flue portion directed in the lateral direction. And a vertical flue portion extending vertically from the horizontal flue portion, the horizontal flue portion having a goal collecting duct that branches from the horizontal flue portion and goes downward, and The bottom surface of the side flue portion is inclined downward toward the goal recovery duct.

  The present invention includes a flue that discharges high-temperature exhaust gas that exits from the glass melting chamber in one direction, and in order to lower the exhaust gas temperature in the flue, an oxygen combustion type glass melting kiln that is liable to cause goal accumulation in the flue, This is particularly effective for a glass melting kiln that does not have a heat storage chamber, such as an air combustion type glass melting kiln that uses this air.

  In the glass melting furnace, the inclination angle of the bottom surface of the horizontal flue portion is 2 to 10 degrees.

  Further, in the glass melting furnace, an opening / closing part is provided below the goal recovery duct, and a cooling body inclined downward toward the opening / closing part is disposed above the opening / closing part. .

  In the glass melting furnace of the present invention, since the bottom surface of the horizontal flue portion is inclined downward toward the goal recovery duct, the goal gathered on the bottom surface of the horizontal flue portion flows down along the inclination and becomes the goal recovery duct. Fall. Therefore, since the goal is not deposited on the bottom surface of the side flue portion, the pressure loss fluctuation of the exhaust gas exhaust gas does not occur, and a stable glass melting operation can be performed.

  In addition, since the goal recovery duct is provided by branching from the side flue portion, the flow of exhaust gas flowing in the flue is not obstructed even if the goal is accumulated in the goal recovery duct.

  Furthermore, in the glass melting furnace of the present invention, by disposing a cooling body at the lower part of the goal recovery duct, the goal dropped on the goal recovery duct is cooled and solidified by this cooling body, and slides down on the cooling body to open and close. It can be easily discharged from the part to the outside of the goal collecting duct.

  Furthermore, since the goal recovery duct is branched from the flue, opening the opening / closing part provided in the lower part of the goal recovery duct has almost no effect on the flow of exhaust gas, and therefore the glass melting operating conditions vary. Nor. In addition, the opening / closing part can be arranged away from the flue and is excellent in the working environment.

  Hereinafter, embodiments of the glass melting furnace of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a flue according to an embodiment of the glass melting furnace of the present invention. The glass melting kiln 11 of this embodiment discharges the exhaust gas G generated in the glass melting chamber 1 and the glass melting chamber 1 in one direction, as in the conventional glass melting kiln 10 (see FIG. 3). The flue 20 is configured to include a horizontal flue portion 3, 3 ′ extending in the horizontal direction and a vertical flue portion 4, 4 ′ moving in the vertical direction. . The horizontal flue portions 3 and 3 ′ shown in FIG. 1 are horizontal, and the vertical flue portions 4 and 4 ′ are vertical. However, the “lateral direction” and the “vertical direction” in the present invention are not necessarily the same. It does not mean “horizontal direction” and “vertical direction”, and the horizontal flue portion and the vertical flue portion may be slightly inclined or curved.

  Further, the horizontal flue portion 3 ′ in the present embodiment has a goal recovery duct 5 that branches from the horizontal flue portion 3 ′ and goes downward, and the bottom surfaces 6, 6 ′ of the horizontal flue portions 3, 3 ′. Is inclined downward toward the goal collecting duct 5.

  In the glass melting furnace 11 of the present embodiment shown in FIG. 1, the exhaust gas G flowing from the glass melting chamber 1 into the horizontal flue section 3 once flows down the vertical flue section 4 in order to lower its temperature, It is discharged upward from the horizontal flue section 3 'through the vertical flue section 4'. Here, the goal collecting duct 5 is provided below the vertical flue portion 4 and below the horizontal flue portions 3 and 3 ′, and the bottom surfaces 6 and 6 ′ of the horizontal flue portions 3 and 3 ′. Is inclined downward toward the goal recovery duct 5 at an inclination angle θ1 = θ2 = 5 degrees. Accordingly, the goals D of the side flue portions 3 and 3 ′ flow down to the goal collection duct 5. The adherence of the goal D to the vertical flue portions 4 and 4 ′ is not so much as the horizontal flue portions 3 and 3 ′, but the goal D attached to the vertical flue portions 4 and 4 ′ flows down due to its own weight. , Either directly or together with the goal D of the side flue sections 3, 3 ′, it falls into the goal collection duct 5.

  Further, the inclination angles θ1 and θ2 of the bottom surfaces 6 and 6 ′ of the horizontal flue sections 3 and 3 ′ toward the goal recovery duct 5 are not particularly limited, but are preferably θ1 = θ2 = 2 to 10 degrees, and more preferably. Is 4-6 degrees. When the inclination angle is less than 2 degrees, the goal D deposited on the bottom surfaces 6 and 6 'of the horizontal flue portions 3 and 3' is difficult to flow downward. On the other hand, when the temperature exceeds 10 degrees, the flow of the exhaust gas G from the glass melting chamber 1 is deteriorated and the temperature in the horizontal flue portions 3 and 3 ′ does not rise, so that the goal D becomes hard to flow.

  According to the glass melting furnace 11 of the present embodiment including the above configuration, the goal D collected on the bottom surfaces 6 and 6 ′ of the horizontal flue portions 3 and 3 ′ flows down along the slope and falls to the goal recovery duct 5. Therefore, the goal D is not deposited on the bottom surfaces 6 and 6 ′ of the horizontal flue portions 3 and 3 ′, the pressure loss fluctuation of the exhaust gas G does not occur, and a stable glass melting operation can be performed.

  Further, since the goal recovery duct 5 is branched from the horizontal flue portion 3 ′, even if the goal D accumulates in the goal recovery duct 5, the flow of the exhaust gas G flowing in the flue 20 is not hindered. .

  Further, as shown in FIG. 1, the goal D accumulated in the goal recovery duct 5 is removed from the opening / closing part 7 provided in the lower part of the goal recovery duct 5, but the goal recovery duct 5 branches off from the flue 20. Even if the opening / closing part 7 provided at the lower part of the goal recovery duct 5 is opened, there is almost no influence on the flow of the exhaust gas G, and therefore the glass melting operation condition does not fluctuate. Furthermore, the opening / closing part 7 can be arranged away from the flue 20 and is excellent in working environment.

  As mentioned above, although one Embodiment of the glass melting kiln of this invention was explained in full detail, this invention is not limited to the said embodiment. For example, as shown in FIG. 1, a cooling body 8 inclined downward toward the opening / closing part 7 may be disposed above the opening / closing part 7 provided on the lower side surface of the goal recovery duct 5. By disposing the cooling body 8, the goal D that has flowed down into the goal recovery duct 5 can be stored in the goal recovery box 9 while being cooled and solidified by the cooling body 8. Examples of the cooling body 8 include those that circulate and cool water in a metal plate-like container having a space inside, but other than this, the goal D that has flowed down is fixed on the surface of the cooling body 8. The structure itself of the cooling body 8 is not particularly limited as long as it can be solidified without cooling. In addition, the cooling body 8 may be provided with a discharging means for discharging the goal D that has flowed down, and the cooling body 8 is inclined at an appropriate angle so that it naturally slides down. Is also possible.

  Furthermore, as another embodiment of the present invention, when the temperature of the exhaust gas G discharged from the glass melting chamber 1 is not high, and therefore it is not necessary to discharge the exhaust gas G after lowering the temperature, it is shown in FIG. Like the glass melting furnace 12, the flue 21 is composed of the horizontal flue portion 3 and the vertical flue portion 4, and the goal recovery duct 5 that branches off from the horizontal flue portion 3 and goes downward is formed into the vertical flue portion. A simple structure provided below 4 is also possible.

  The glass melting kilns 11 and 12 according to the embodiments of the present invention exemplified above should not be construed as substantially limiting the technical idea of the present invention. For example, in the glass melting furnace 11 shown in FIG. 1, the goal recovery duct 5 branched from the horizontal flue portion 3 ′ and directed downward is provided below the vertical flue portion 4. It is also possible to provide it below the road portion 4 ′. In this case, it goes without saying that the inclination of the bottom surface 6 'of the horizontal flue portion 3' is opposite to that shown in FIG. Moreover, the goal collection | recovery duct 5 which branches from the middle of the horizontal flue part 3 ', and goes below may be provided.

  Furthermore, in the glass melting kilns 11 and 12 according to the above embodiment, the horizontal flue portions 3 and 3 ′ are horizontal, and only the bottom surfaces 6 and 6 ′ are inclined downward toward the goal recovery duct 5, The side flue portions 3, 3 ′ themselves may be inclined downward toward the goal recovery duct 5. That is, for example, in FIG. 1, the bottom surfaces 6 and 6 ′ of the horizontal flue portions 3 and 3 ′ are horizontal (= the bottom surface and the top surface are parallel), and the horizontal flue portions 3 and 3 ′ themselves The bottom surfaces 6 and 6 ′ can also be inclined by inclining downward toward the recovery duct 5, and the same effect as the glass melting furnace 11 can be obtained. In this case, the inclination angle of the horizontal flue portion = the inclination angle of the bottom surface, and by setting the inclination angle of the horizontal flue portion to 2 to 10 degrees, the inclination angles θ1 and θ2 of the bottom surface are set to 2 to 10 degrees. The same effect as the set aspect can be obtained.

  Furthermore, in the glass melting furnaces 11 and 12 shown in FIGS. 1 and 2, the opening / closing part 7 is provided on the lower side surface of the goal recovery duct 5, but this opening / closing part 7 is provided on the lower end part of the goal recovery duct 5. The present invention may be carried out while improving, changing, or adding as appropriate based on the ingenuity and ingenuity of those skilled in the art without departing from the spirit of the present invention.

Sectional drawing of the flue which concerns on one Embodiment of the glass melting furnace of this invention. Sectional drawing of the flue which concerns on other embodiment of the glass melting furnace of this invention. The schematic plan view of the glass melting furnace of this invention. Sectional drawing of the flue in the conventional glass melting furnace.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass melting chamber 2, 20, 21 Flue 3, 3 'Horizontal flue part 4, 4' Vertical flue part 5 Goal recovery duct 6, 6 'Bottom face of horizontal flue part 7 Opening and closing part 8 Cooling body 9, 9 'Goal collection box 10, 11, 12 Glass melting furnace D Goal G Exhaust gas θ1, θ2 Inclination angle

Claims (3)

A glass melting chamber for melting the glass raw material, and a flue for discharging exhaust gas generated in the glass melting chamber,
The flue has a horizontal flue portion that extends in the lateral direction, and a vertical flue portion that extends in the vertical direction from the horizontal flue portion,
A glass melting furnace in which the horizontal flue portion has a goal recovery duct that branches from the horizontal flue portion and goes downward, and a bottom surface of the horizontal flue portion is inclined downward toward the goal recovery duct .   The glass melting furnace according to claim 1, wherein an inclination angle of a bottom surface of the horizontal flue portion is 2 to 10 degrees.   The glass melting furnace according to claim 1 or 2, wherein an opening / closing part is provided at a lower portion of the goal collecting duct, and a cooling body inclined downward toward the opening / closing part is disposed above the opening / closing part.

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