JP5094352B2 - Glass melting equipment - Google Patents

Description

  The present invention relates to a glass melting apparatus, and more particularly to an improvement of a glass melting apparatus provided with an oxygen burner as a heating source.

  Conventionally, as a glass melting apparatus equipped with an oxygen burner as a heating source, glass raw materials and auxiliary raw materials (hereinafter referred to as glass raw materials, etc.) introduced into the furnace for melting glass are attached to the side walls of the furnace body. In addition, those dissolved by an oxygen burner are known (for example, see Patent Document 1). However, in such a conventional glass melting apparatus, the glass raw material charged into the furnace body is melted by using the radiant heat generated by the combustion of the oxygen burner. Therefore, there is a problem that it takes a long time, and as a result, the entire melting apparatus becomes large.

In order to improve the above-mentioned problems, an oxygen burner is attached to the ceiling wall of the glass melting furnace body in a downward direction, and the oxygen burner is burned downward by supplying a glass raw material or the like to the oxygen burner by gas conveyance. In addition, a glass material or the like that is supplied downward and melted in the flame is proposed (for example, see Patent Document 2). However, such a conventional glass melting apparatus has the advantage that the energy efficiency can be improved correspondingly, and the melting of the entire melting apparatus can be reduced by generating the glass melt in a short time. This causes a problem that the yield is poor because a considerable amount of is exhausted along with the exhaust gas. In this case, it is conceivable to collect and reuse glass raw materials accompanying the exhaust gas in a downstream exhaust gas treatment facility such as a bag filter, but in this way, a large load is simply imposed on the exhaust gas treatment facility. There is a risk that the composition of the glass raw material or the like to be melted may be changed.
JP 2005-15299 A JP 2007-153676 A

  The problem to be solved by the present invention is to provide a glass melting apparatus that is energy efficient, can generate a glass melt in a short time, and thus can reduce the size of the entire melting apparatus and has a high yield. .

The present invention for solving the above problems is a glass melting apparatus for generating a glass melt from a glass raw material or the like, a furnace body for melting glass, an oxygen burner attached downward to the ceiling wall of the furnace body, A cyclone connected to the exhaust gas outlet in the immediate vicinity of the exhaust gas outlet of the furnace body, and a return means for returning the oxygen recovered by the cyclone to the oxygen burner, the oxygen burner being recovered by the cyclone at the outermost peripheral portion It has a re-supply nozzle for those returned Te, also adapted to be supplied by the glass raw material is gas conveyed together to the oxygen burner oxygen concentration of 90 volume% or more of oxidizing gas supplied In addition, a small pool is formed at the bottom of the furnace body including a portion directly below the oxygen burner and is blocked by a weir. The oxygen burner is burned downward and the glass raw material is directed downward into the flame. While the molten glass is supplied and melted, the generated glass melt is temporarily stored in the small pool and then overflowed from the weir. On the other hand, the glass raw material accompanying the exhaust gas is collected by the cyclone, and is returned by the return means. back to oxygen burner, according to the glass melting apparatus characterized by comprising as subjected to again dissolve the該再supply nozzle of the oxygen burner.

The glass melting apparatus according to the present invention also includes a furnace body for melting glass and an oxygen burner attached downward to the ceiling wall of the furnace body, and the oxygen burner has a combustion support gas having an oxygen concentration of 90% by volume or more. Is supplied, and glass raw materials and the like are supplied by gas conveyance. In the glass melting apparatus according to the present invention, a cyclone is connected to the exhaust gas outlet in the immediate vicinity of the exhaust gas outlet of the furnace body, and between the cyclone and the oxygen burner, a glass raw material recovered by the cyclone and the like ( Returning means for returning the recovered glass raw material or the like to the oxygen burner is provided, and the oxygen burner again supplies the recovered glass raw material recovered and returned by the cyclone to the outermost peripheral portion. that we have a re-supply nozzle. In the glass melting apparatus according to the present invention, a small pool is formed at the bottom of the furnace body, including a portion immediately below the oxygen burner, and is blocked by a weir. The small pool includes a bottom wall and a side wall of the furnace body. It is surrounded by the weir. In the glass melting apparatus according to the present invention, the oxygen burner is burned downward and the glass raw material or the like is supplied and melted downward in the flame, while the generated glass melt is temporarily stored in the small pool and then the weir. while overflowing from the glass raw material entrained in the exhaust gas was collected in a cyclone and returned to the oxygen burner in returning means, so that once again subjected to dissolve from the re-feeding nozzle of the oxygen burner.

In the glass melting apparatus according to the present invention, since the glass raw material is supplied and melted downward in a high-temperature flame that burns downward in the oxygen burner, it is energy efficient and the glass raw material supplied downward is short in time. Since the glass melt becomes a glass melt and is homogenized into a desired glass melt that has been sufficiently degassed while being temporarily stored in the small pool immediately below, the entire melting apparatus can be downsized. In addition, in the glass melting apparatus according to the present invention, glass raw materials and the like discharged from the exhaust gas outlet of the furnace body accompanying the exhaust gas are recovered by a cyclone in the immediate vicinity of the exhaust gas outlet, and the recovered glass raw materials and the like are immediately turned into an oxygen burner back, for providing the again dissolved from the re-feeding nozzle of the oxygen burner, yield is good. In this way, a large load is not applied to the exhaust gas treatment facility on the downstream side, and the composition of the glass raw material or the like used for melting is not changed.

In glass melting apparatus according to the present invention, as the oxygen burner itself can Applications: the known ones, for example, as described in JP-A-8-312938, JP-2000-55340 and JP-2000-103656 Patent Publication JP oxygen burner such as is possible for response. In these oxygen burners, the nozzle structure at the tip is directed from the center to the outer periphery, the fuel supply nozzle, the supply nozzle for the primary combustion support gas, the processing object (glass raw material etc.) supply nozzle, and the secondary combustion support gas supply nozzle As shown, the plurality of supply nozzles are concentrically arranged .

In the glass melting apparatus according to the present invention, as the oxygen burner, as described above, a plurality of supply nozzles are concentrically arranged from the central portion toward the outer peripheral portion, and the oxygen burner is further recovered by a cyclone at the outermost peripheral portion. those having a re-supply nozzle recovery glass raw material returned Te used. By re-supplying the recovered glass raw material or the like with a nozzle different from the supply of the original glass raw material or the like through the processing object (glass raw material or the like) supply nozzle, the supply of the original glass raw material or the like is adversely affected. This is so as not to exert any impact. In this case, it is particularly preferable that a blower fan is connected to the resupply nozzle at the outermost periphery of the oxygen burner, and that air is sent from the blower fan to the resupply nozzle, usually in a direction along the peripheral surface. . Such air feeding prevents clogging of the recovered glass raw material in the resupply nozzle, and forms an air curtain as if a cylindrical glass curtain that accompanies the recovered glass raw material downward from the tip of the oxygen burner. This prevents the original glass raw material supplied inside from scattering and trying to accompany the exhaust gas, and at the same time, cools and protects the oxygen burner that has a considerably high temperature.

  In the glass melting apparatus according to the present invention, it is preferable that a blower fan is connected to the cyclone, and air is sent from the blower fan to the cyclone usually in a direction along the circumferential surface. This air feed improves the recovery rate by applying a large centrifugal force to the glass raw material in the cyclone, and at the same time cools the exhaust gas that reaches a considerably high temperature, including not only the cyclone but also the downstream side. This is to protect the exhaust gas treatment facility.

  Furthermore, in the glass melting apparatus according to the present invention, it is preferable that the auxiliary burner is attached to the side wall of the furnace body so as to face the glass melt to be overflowed from the weir. This is to encourage the glass melt temporarily stored in the small pool to smoothly overflow from the weir.

  According to the glass melting apparatus according to the present invention, the energy efficiency is good, the glass melt can be generated in a short time, and therefore the entire melting apparatus can be miniaturized and the yield is good.

  FIG. 1 is a general view partially illustrating a glass melting apparatus according to the present invention in a longitudinal section, and FIG. 2 is a bottom view showing the oxygen burner of FIG. An oxygen burner 21 is attached to the ceiling wall of the furnace body 11 having a substantially rectangular outer shape in a vertical cross section, and an exhaust gas outlet 51 is provided at the edge of the ceiling wall. A small pool 62 is formed at the bottom including the portion directly below the oxygen burner 21 and blocked by the weir 61. The illustrated small pool 62 is surrounded by the bottom wall, the side wall, and the weir 61 of the furnace body 11.

  The oxygen burner 21 is directed from the center to the outer periphery, and includes a fuel supply nozzle 22, a primary support gas supply nozzle 23, a glass material supply nozzle 24, a secondary support gas supply nozzle 25, and a recovered glass material resupply nozzle 26. A plurality of supply nozzles are concentrically arranged in this order. The primary combustion gas supply nozzle 23 and the secondary combustion gas supply nozzle 25 of the oxygen burner 21 are supplied with a combustion support gas having an oxygen concentration of 90% by volume or more from the adsorption oxygen generator 31 via the combustion control unit 32. The fuel gas is supplied to the fuel supply nozzle 22 from the fuel tank 33 via the combustion control unit 32. Further, a gas conveying system 41 is connected to the glass raw material supply nozzle 24 of the oxygen burner 21 so that the glass raw material is supplied by gas conveyance. A compressor 42 with a dryer is connected to the upstream side of the gas transport system 41, and a glass raw material supply system 43 is connected in the middle thereof. The glass raw material supply system 43 includes a hopper 44 for storing glass raw materials, a quantitative cutting device 45 connected to the hopper 44, a crusher 46 connected to the quantitative cutting device 45, and a quantitative connected to the crusher 46. A supply device 47 is provided.

  A cyclone 53 is connected to the exhaust gas outlet 51 through a duct 52 in the immediate vicinity thereof, and an exhaust gas treatment facility (not shown) is connected to the downstream side of the cyclone 53. A screw conveyor 56 as a return means is connected to the lower end portion of the capture container 54 of the cyclone 53 via a rotary valve 55, and the distal end portion of the screw conveyor 56 is a recovered glass formed on the outermost peripheral portion of the oxygen burner 21. It is connected to the raw material resupply nozzle 26.

  A blower fan 71 is connected to the resupply nozzle 26 for the recovered glass material etc. of the oxygen burner 21, and the blower fan 71 is also branched and connected to the capture container 54 of the cyclone 53. An automatic valve 72 is interposed between the blower fan 71 and the capture container 54, and the opening degree of the automatic valve 72 is adjusted by the exhaust gas temperature in the duct on the downstream side of the cyclone 53. On the other hand, an auxiliary burner 63 is attached to the side wall of the furnace body 11 facing the glass melt A that is temporarily stored in the small pool 62 and then overflows from the weir 61. The glass melt A overflowed from the weir 61 flows down to a clarification tank (not shown) connected to the furnace body 11.

  In the illustrated glass melting apparatus, the oxygen burner 21 is burned downward, and the glass raw material and the like are temporarily supplied to the small pool 62 while being melted by supplying the glass raw material or the like downward into the flame by gas conveyance. After the storage, the glass material is overflowed from the weir 61, while the glass material and the like accompanying the exhaust gas and discharged from the exhaust gas outlet 51 is recovered by the cyclone 53, and the recovered glass material formed on the outermost periphery of the oxygen burner 21 by the screw conveyor 56. It returns to the equal refeed nozzle 26 and is used again for melting. In the recovery operation, air is sent from the blower fan 71 to the recovered glass material resupply nozzle 26 from the direction along the peripheral surface thereof, so that the recovered glass material etc. are clogged in the recovered glass material resupply nozzle 26. In addition, the air curtain is formed as if it is accompanied by the recovered glass raw material downward from the front end of the oxygen burner 21, and the original glass raw material supplied inside is thereby scattered. The oxygen burner 21 is prevented from being accompanied by the exhaust gas, and at the same time, the oxygen burner 21 having a considerably high temperature is cooled, and air is blown from the blower fan 71 to the capture container 54 of the cyclone 53 from the direction along the peripheral surface thereof. By feeding, a large centrifugal force is applied to the glass raw material in the cyclone 53 to improve the recovery rate, and at the same time a considerable high temperature Comprising the exhaust gas is cooled, not only the cyclone 53, so as to protect the exhaust gas treatment equipment downstream, including the ducts. Further, by blowing a flame from the auxiliary burner 63 toward the glass melt A that is about to overflow from the weir 61, the glass melt A temporarily stored in the small pool 62 is encouraged to smoothly overflow from the weir 61. It is like that.

BRIEF DESCRIPTION OF THE DRAWINGS The whole figure which illustrates in part a longitudinal cross section the glass melting apparatus which concerns on this invention. The bottom view which shows the oxygen burner of FIG.

DESCRIPTION OF SYMBOLS 11 Furnace 21 Oxygen burner 22 Fuel supply nozzle 23 Primary combustion gas supply nozzle 24 Glass raw material supply nozzle 25 Secondary combustion gas supply nozzle 26 Recovered glass raw material resupply nozzle 51 Exhaust gas outlet 53 Cyclone 56 Screw conveyor 61 Weir 62 Small pool 63 Auxiliary burner 71 Blower fan

Claims (5)

In a glass melting apparatus for generating glass melt from glass raw materials and auxiliary raw materials, a furnace body for melting glass, an oxygen burner mounted downward on the ceiling wall of the furnace body, and in the immediate vicinity of the exhaust gas outlet of the furnace body A cyclone connected to the exhaust gas outlet, and a return means for returning the material recovered by the cyclone to the oxygen burner. The oxygen burner is a recycler for the one recovered and returned by the cyclone to the outermost periphery. It has a supply nozzle, also to the oxygen burners are adapted to the glass raw material and auxiliary materials with oxygen concentration of 90 volume% or more of oxidizing gas is supplied is supplied by the gas transport and the furnace body A small pool is formed at the bottom, including the immediate lower part of the oxygen burner, and blocked by a weir. The oxygen burner is burned downward and glass raw materials and auxiliary raw materials are supplied downward into the flame. The glass melt generated is temporarily stored in the small pool and then overflowed from the weir while the glass raw material and auxiliary raw materials accompanying the exhaust gas are recovered by the cyclone, and the return means back to oxygen burner, glass melting apparatus characterized by comprising as subjected to again dissolve the該再supply nozzle of the oxygen burner.   A plurality of supply nozzles are arranged concentrically in the order of the oxygen burner from the center to the outer periphery, in the order of fuel supply nozzle, primary combustion support gas supply nozzle, glass material and auxiliary material supply nozzle, and secondary support gas supply nozzle. The glass melting apparatus according to claim 1, wherein A blower fan is connected to the resupply nozzle at the outermost periphery of the oxygen burner, and air for supplying the glass raw material and auxiliary raw material and cooling the oxygen burner is sent from the blower fan to the resupply nozzle. The glass melting apparatus according to claim 1 or 2 . Blower fan to a cyclone is connected, to the cyclone from air blowing fan, any one of claims 1 to 3 which is adapted feeding the glass material and the cooling air collection auxiliary and exhaust gas of auxiliary materials The glass melting apparatus as described. The glass melting apparatus according to any one of claims 1 to 4 , wherein an auxiliary burner is attached to a side wall of the furnace body so as to face a glass melt to be overflowed from the weir.

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