WO2005121036A1

WO2005121036A1 - Convection type heating furnace for heating glass sheets

Info

Publication number: WO2005121036A1
Application number: PCT/CN2004/000617
Authority: WO
Inventors: Yan Zhao
Original assignee: Yan Zhao
Priority date: 2004-06-08
Filing date: 2004-06-08
Publication date: 2005-12-22

Abstract

This invention discloses a convection type heating furnace for heating glass sheets. The furnace includes a stack. An inlet and an outlet for the glass sheets are set in the stack, and a transfer device for the glass sheets is set in the stack. A hot gas injection apparatus is installed in the stack. The apparatus and a fan form a gas circulation loop by means of pipes and a furnace inner chamber. A flame radiation tube heater is installed in air duct between the fan and a hot gas ejection opening of the hot gas injection apparatus. The heating furnace heats the glass sheets by ejecting hot gas, which eliminates the defect of long heating time and low heating efficiency occuring in the high reflectance and high transmissivity glass sheet. The interal of the stack is divided into serveral heating zones in a manner of gas collection tanks, as well as a heater and a temperature detecting device are provided in each tank, so that the local temperature in the furnace is convenient to control the surcture is more compact, and the maintanence is easier. A sensor is installed in the stack for detecting C02 to provide security for the Operation of the equipment.

Description

Convection glass plate heating furnace

The present invention relates to a glass plate heating furnace, in particular to a heating furnace that feeds glass plate f force P heat completely by convection. Background

Existing glass plate heating furnaces usually work in a radiative manner, that is, the glass plates are heated by infrared rays emitted by resistance heating elements. Some types of glass have low blackness, relatively high reflectance and transmittance, and relatively poor absorption of radiant heating. Therefore, conventional radiation methods are used for heating, which has the problems of long heating time and low heating efficiency. For example, when using LOW-E, a large amount of heat is reflected, and the surface temperature of the glass plate cannot meet the requirements. In addition, during radiant heating, the roller table directly conducts heat to the lower surface of the glass plate, and this part of the conductive heat is greater than the radiant heat received by the surface of the glass plate, resulting in a certain temperature difference between the glass plate and the lower surface, which causes the glass edge Warping, and at the same time, a white fog phenomenon is generated at the contact part with the roller table, and finally affects the glass processing quality. Summary of the invention

In view of the shortcomings of the prior art, the object of the present invention is to provide a convection glass ¾w heating furnace. The heating furnace uses jet heating technology to blow high temperature gas onto the surface of a glass plate, and convects the glass plate with the high temperature gas. Heat exchange completes the heating of the glass plate.

In order to achieve the above object, the convection glass plate heating furnace of the present invention includes a furnace body, and the furnace body A glass plate inlet and outlet are provided, and a glass plate conveying mechanism is provided in the furnace body; at least one side of the glass plate conveying passage in the furnace body is provided with a high-temperature gas injection device, and the high-temperature gas injection device faces a heated glass plate side with dense high-temperature gas ejection outlets, The high-temperature gas injection device and the fan form a gas circulation loop through the pipe and the furnace inner cavity. The furnace internal cavity is in communication with the fan inlet. The air flow channel between the high-temperature gas injection port on the high-temperature gas injection device and the fan is provided. The flame radiant tube heater is used to complete the heating of the gas in the gas circulation circuit.

Further, the flame radiant tube heater is a regenerative flame radiant tube heater. The regenerative flame radiant tube heater is composed of a radiant tube and a pair of main burners, and the main burner is provided with heat storage. The two main burners are air-tightly installed at the two ends of the radiant tube to match with them. The furnace body is provided with corresponding fuel delivery pipes, air supply pipes and smoke exhaust pipes. The air inlets on the two main burners pass through one, two and four. The valve is connected to the air supply pipe and the smoke exhaust pipe. Under the control of two two-way wide pipes, the two main burners alternately burn, alternately store heat, and alternately exhaust smoke. The fuel delivery pipes of the two main burners are independent of each other. Control valve.

Further, the heat storage body is a ceramic heat storage ball or a honeycomb ceramic heat storage body.

Further, the regenerative flame radiant tube heater is directly installed in the high-temperature gas injection device, or installed in a connection pipe between the high-temperature gas injection device and the fan, or through an airtight casing Inserted on the airflow channel between the high-temperature gas humming device and the fan.

Further, a co ₂ gas sensor is provided in the furnace body.

Further, the high-temperature gas injection device is composed of a pipe, which is arranged or arranged in a coil, wherein each pipe in the arrangement is linear or wavy and mutually The high-temperature gas ejection port is formed by a high-temperature gas nozzle or a high-temperature gas ejection hole provided on a pipe.

Further, the high-temperature gas injection device is composed of at least one air collecting box, which is an airtight box body, and is provided with an air inlet and an air outlet, and the air inlet is connected to the fan through a pipe, and A spout plate is arranged at the gas port, and the spout plate is densely covered with high-temperature gas ejection holes. The spout plate faces the heated glass plate and is located at an appropriate distance from the surface of the «0 hot glass plate. Each gas collection box is provided with at least A regenerative flame radiant tube heater is provided with a temperature sensor in each gas collecting box.

Further, the spray plate is further provided with an exhaust gas recovery hole, and the exhaust gas recovery hole communicates with a cavity inside the furnace body outside the gas collection box through a pipe.

Further, the spout plate is a wave-shaped plate, the high-temperature gas ejection holes are distributed at the troughs near the surface of the heated glass plate, and the exhaust gas recovery holes are disposed at the crests far from the heated glass surface. Further, the two-position four-way valve corresponds to one of the air collection tanks, and an air volume regulating valve is provided between each two-way four-way valve and the air supply pipe, and in each air collection tank, A common proportional regulating valve is provided between each regenerative flame radiant tube heater and the fuel delivery pipe, and the common proportional regulating valve is located on the gas delivery pipe upstream of the control valve and corresponds to the same gas collection box. The proportional control valve and the air volume control valve are linked with each other.

Further, the furnace body is horizontal, and includes an upper furnace body and a lower furnace body. A roller-type glass plate conveying mechanism is installed on the lower furnace body, and at least one of the gas collection boxes is installed on the upper and lower furnace bodies. The gas collecting box in the upper furnace body can be vertically installed on the upper furnace body through a suspension mechanism, and the gas collecting box in the lower furnace body supports a vertically movable lifting device provided in the lower furnace body. On top, the suspension mechanism is a screw nut mechanism, and the gas collecting box is suspended on the screw by a nut, and the screw is fixed on the upper furnace body, and the upper end is connected to a leveling mechanism provided on the collar wall of the furnace body. It is a worm and worm operating mechanism, or a gear or sprocket operating mechanism. The lifting device is a screw and nut lifting mechanism. The gas collecting box is fixed to the nut and connected to the screw through the nut. The screw can be rotatably installed on the lower furnace body. The screw is connected to the worm gear lever or gear or sprocket control mechanism, and can rotate under the control of the vertical mechanism.

The heating furnace of the present invention heats the glass plate by spraying high-temperature gas on the surface of the glass plate, which effectively eliminates the defects of low heating efficiency and heating time of the traditional heating furnace when heating the high reflectance and high transmittance glass plates. . The furnace body is divided into several heating areas by a gas collecting box, and heaters and temperature detection devices are provided in each gas collecting box, which not only facilitates the control of the local temperature in the furnace body, but also makes the structure of the furnace body more compact and more maintainable. Convenience. The co ₂ gas sensor is installed in the furnace body, which can also be used for fault diagnosis of the heater while ensuring the safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of the structure of the present invention;

Figure 2 is an E-E view in Figure 1;

FIG. 3 is a structural schematic view of a jet plate;

FIG. 4 is a view from F to F in FIG. 3;

FIG. 5 is a schematic structural diagram of a fuel supply pipeline of a regenerative flame radiant tube heater; FIG. 6 is a schematic structural diagram of a wind supply and smoke exhaust pipeline of the regenerative flame radiant tube heater. detailed description

FIG. 1 and FIG. 2 are schematic cross-sectional views showing the structure of a convection glass plate heating furnace according to the present invention. The heating furnace includes a lower furnace body 1, an upper furnace body 5, and glass is arranged on both sides of the upper and lower furnace bodies. The plate input port 3, the glass plate output port 11, the glass plate conveying roller 13 is installed on the lower furnace body 1, and 12 gas collection boxes 2 are respectively arranged in the upper and lower furnace bodies. The gas collection box 2 is a closed box. An air inlet 4 and an air outlet are provided on the air outlet. A jet plate 14 is provided at the air outlet. The jet plate 14 is provided with a high-temperature gas ejection hole 24 and an exhaust gas recovery hole 25 (see Figs. 3 and 4). The air outlet of the air box 2 is arranged facing the glass plate conveying roller table 13 and is at a proper distance from the glass plate conveying roller table 13. The air inlet 4 of the gas collecting box 2 is connected to the exhaust port of the fan 8 through a pipe 6. Gas tank 2 is provided with two regenerative flame radiant tube heaters 10, and the air inlet of fan 8 passes through pipe 7 and pipe 9 in gas collecting box 2 ^ T gas collecting box jet ^ Ji exhaust gas recovery holes 25 The exhaust gas at the exhaust gas recovery hole 25 is introduced by the pipe 9 in the gas collection box 2 into the cavity of the furnace body at the end of the gas collection box 2 away from the glass plate conveying roller. The air inlet of the machine 8, the pipe 7, the inner cavity of the furnace, the pipe 9 in the gas collection box 2, the exhaust gas recovery hole 25, the exhaust port of the fan 8, the pipe 6, the gas collection box 2, and the high-temperature gas ejection hole 24 together form a gas. In the circulation circuit, two regenerative flame radiant tube heaters 10 provided in the gas collection box 2 are located on a gas passage between the gas inlet of the gas collection box 2 and the high-temperature gas ejection hole 24. The gas collecting box 2 in the upper furnace body 5 is a sectional view. Each gas collecting box 2 in the upper furnace body 5 is suspended on two screws 17 by nuts 15, respectively. The screw 17 can be rotatably installed on the top wall of the upper furnace body. Under the control of the mechanism 16, the screw 17 rotates and thereby drives the gas collecting tank 2 to move up and down. Each gas collecting box 2 in the lower furnace body 1 is supported by two or four screws 22 through a nut 23, and the lower end of the screw 22 can be rotatably installed on the lower furnace body 1. The lower end of the screw 22 and the worm wheel The worm operating mechanism 31 is connected. Under the operation of the operating mechanism 31, the screw 22 rotates and drives the gas collecting box 2 connected to it to move up and down. The CO ₂ gas sensor 33 is installed on the upper furnace body 5, and a temperature measuring thermocouple 32 is installed in each gas collection box 2.

As shown in FIG. 3 and FIG. 4, the cross section of the spout plate 14 at the air outlet of the gas collection tank 2 is wavy, a high-temperature gas ejection hole 24 is provided at the trough, and a square exhaust gas recovery hole 25 is provided at the crest. In the gas collection box 2, the high-temperature gas ejection hole 24 is close to the glass plate conveying roller table 13, the exhaust gas recovery hole 25 is far from the glass plate conveying roller table 13, and the pipe 9 communicates the exhaust gas recovery hole 25 with the inner cavity of the furnace and is connected with the gas collection The inner cavities of the boxes 2 are isolated from each other. The wave-shaped cross section of the spray plate 14 may be a uniform wave shape, or a non-uniform wave shape in which the positions of the peaks and troughs are inconsistent _a . The spray plate 14 of the gas collecting box 2 in the upper furnace body 5 is directly heated by facing The glass plate 12 is provided with a glass plate conveying roller 13 between the spray plate 14 of the gas collection box 2 and the lower surface of the glass plate 12 in the lower furnace body 1. Therefore, in order to uniformly heat the upper and lower surfaces of the glass plate 12, The shape of the jet plate of the gas collecting box 2 in the lower furnace body can be made into different shapes. In order to make the glass plate 12 heat uniformly in each part of the upper furnace body 5 or the lower furnace body 1, each of the gas collection boxes 1 and the spout plates in the upper furnace body 5 or the lower furnace body 1 can also be made to have different shapes. .

In Figures 5 and 6, only four sets of regenerative flame radiant tube heaters in the four gas collection tanks 2 are shown for fuel delivery and air supply and smoke exhaust pipeline structure diagrams. As shown in the figure, the regenerative flames The radiant tube heater 10 is composed of a radiant tube 102 and a pair of main burners 101. A heat storage body is provided in the main burner 101, and the two main burners 101 are air-tightly installed at both ends of the radiant tube 102. The radiant tube 102 is linear and made of heat-resistant steel. The thermal storage body in the main burner 101 is a ceramic thermal storage ball or a honeycomb-shaped ceramic thermal storage body.

Match with regenerative flame radiant tube heater 10, corresponding main gas is set outside the furnace The transport duct 26, the air supply duct 29, and the smoke exhaust duct 30. The main fuel delivery pipe 26 sends fuel to each main burner 101 through sub-pipes 19, and each sub-pipe 19 is provided with an electromagnetic control valve 18, and two regenerative flame radiant tubes in each gas collection box 2 are heated The four main burners 101 in the heater 10 are connected to the main fuel delivery pipe 26 through a common proportional regulating valve 27. The air inlet and smoke exhaust port of the main burner 101 in the two regenerative flame radiant tube heaters 10 in each air collection tank 2 are connected in parallel with each other, and a two-position four-way valve 21 and an air supply pipe 29 The smoke exhaust pipe 30 is connected. Under the control of the two-position four-way valve 21, the two main burners 101 in each regenerative flame radiant tube heater alternately burn, alternately exhaust smoke, and alternately store heat, that is, one of the main burner 101 and the air supply pipe When 29 is connected, the other main burner 101 is connected to the smoke exhaust pipe 30. The main burner 101 connected to the air supply pipe 29 is burned, and the exhaust gas after combustion is discharged into the exhaust pipe through the radiation pipe 102 and the other main burner 101. In the smoke duct 30, the high-temperature exhaust gas passes through the main burner 101 serving as a flue, and at the same time, heats the heat storage body therein; when a main burner 101 burns for a proper time, the two-position four-way valve 21 operates, so that the two main The communication state of the burner 101 with the air supply duct 29 and the smoke exhaust duct 30 is switched to each other. The main burner 101, which originally used as a flue and accumulating heat, starts to burn, and the other main burner 101 changes from the combustion state to exhaust and accumulates heat. In this way, when the main burner 101 burns after the heat is stored, the combustion and combustion air entering the burner are preheated by the heat storage body before combustion, so the heat storage body provided in the main burner 101 not only makes the combustion flame The temperature increases, and the heat in the exhaust gas can be recovered. Combustion efficiency of thermal energy. An air volume control valve 28 is provided between each two-position four-way valve 21 and the air supply pipe 29, and the air volume control gang 28 is linked with the proportional adjustment valve 27 through a connecting rod (not shown in the figure).

According to actual needs, the radiating tube 102 may also be made into a W-shape or a U-shape.

After setting the temperature measuring thermocouple 32 in each collecting box 2, the temperature of each collecting box can be measured. Real-time detection. When an abnormal temperature occurs in a certain area, the temperature of the area can be adjusted in time by adjusting the fuel supply of the regenerative flame radiant tube in the area. C0 ₂ gas furnace body is provided after the sensor 33, when the detection result display C0 ₂ gas concentration abnormality furnace body, the furnace body described regenerative radiant tube heaters 10 Flame possible breakage, and thus can be used to monitor the heater Working conditions to ensure the safety of operators.

During the operation of the present invention, the glass plate 12 to be heated enters the furnace body from the glass plate input port 3 on the side of the furnace body, and is supported on the glass plate conveying roller table 13, and the fan 8 sends the gas to each set along the arrow C in FIG. In the gas box 2, the gas entering the gas collecting box 2 is changed into a high-temperature gas by the heater 10, and the heated high-temperature gas is sprayed from the high-temperature gas ejection holes 24 on the spray plate 14 to the upper and lower surfaces of the glass plate 12, and The exhaust gas after convective heat exchange of the glass plate 12 enters the furnace cavity away from the glass plate 12 from the exhaust gas recovery hole 25 and the pipe 9 and is sucked into the fan 8 through the through hole provided in the furnace body, and the fan 8 sends the sucked exhaust gas again. Go to the gas collection box 2 and make it re-enter the cycle, and so on.

After the gas collecting box 2 can be installed in the upper and lower furnace bodies to move up and down, it is not only convenient for the maintenance and maintenance of the gas collecting box 2, but also for replacing and repairing the heater in the gas collecting box 2.

The upper and lower furnace bodies are respectively covered with a plurality of gas collecting boxes 1 to cover the surface of the heated glass, which not only facilitates the processing, installation, maintenance and maintenance of the gas collecting box 1, but also facilitates the distribution of heating power in various parts of the furnace body. At the same time, it is beneficial to control the glass heating state. Since the gas collecting box 2 is divided into the upper furnace body 5 and the lower furnace body 1, and each of the gas collecting boxes 2 is relatively independent, the number of the gas collecting boxes can be set according to the specific conditions of the upper and lower surfaces of the heated glass. And the location of each header. The gas collecting boxes in the upper and lower furnace bodies can be arranged symmetrically or asymmetrically. The heating power of the electric heaters in each gas collecting box can be the same. It may also be different, and the volume and structure of each gas collecting box are completely the same, and each of them may have a proper structure and size.

The convection glass plate heating furnace of the present invention can also be made as required. The glass plate enters and exits the heating furnace through a hanging conveying mechanism. At this time, it is only necessary to set the thermal storage flame radiation tube vertically in the furnace body on both sides of the glass plate. can.

The drawing shows only one specific implementation manner of the present invention, and does not limit the protection scope of the present invention. Any other implementation manners made according to the design ideas of the present invention are within the protection scope of the present invention.

Claims

Claim

1. A convection glass plate heating furnace comprising a furnace body, a glass plate inlet and outlet are provided on the furnace body, and a glass plate conveying mechanism is provided in the furnace body, characterized in that at least one side of the glass plate conveying passage in the furnace body is provided with high temperature A gas injection device. The high temperature gas injection device is densely covered with a high temperature gas outlet on the side facing the heated glass plate. The high temperature gas injection device and the fan pass through the tube to form a gas circulation loop in the furnace interior. The furnace interior is in communication with the fan inlet. A flame radiant tube heater is provided on the air flow passage between the high temperature gas ejection outlet on the high temperature gas injection device and the fan, and the flame radiant tube heater is used to complete the heating of the gas in the gas circulation circuit.

2. The convection glass heating furnace according to claim 1, wherein the flame radiant tube heater is a regenerative flame radiant tube heater, and the regenerative flame radiant tube heater is a radiant tube It consists of a pair of main burners. The main burner is provided with a heat storage body. The two main burners are air-tightly installed at both ends of the radiant tube to match with them. The furnace body is provided with corresponding fuel delivery pipes, air supply pipes and smoke exhaust. In the pipeline, the air inlets on the two main burners are connected to the air supply pipe and the exhaust pipe through a two-position four-way valve. Under the control of the two-position four-gang gang, the two main burners alternately burn, alternately store heat, and alternately exhaust The fuel delivery pipes of the two main burners are provided with independent control valves.

3. The convection glass heating furnace according to claim 1, wherein the heat storage body is a ceramic heat storage ball or a honeycomb ceramic heat storage body.

4. The convection glass heating furnace according to claim 3, wherein the regenerative flame radiant tube heater is directly installed in the high temperature gas injection device, or is installed in the high temperature gas injection device and In the connecting pipe between the fans, or through a gas The dense shell is inserted in an air flow passage between the high-temperature gas injection device and the fan.

5. The convection glass heating furnace according to claim 4, wherein a CO ₂ gas sensor is provided in the furnace body.

6. The convection glass heating furnace according to claim 5, wherein the high-temperature gas injection device is composed of a pipe, and the pipe is coiled or arranged, wherein each pipe in the arrangement is linear or wavy And communicate with each other, the high-temperature gas ejection outlet is formed by a high-temperature gas nozzle or a high-temperature gas scooping hole provided on a pipe.

7. The convection glass heating furnace according to claim 5, wherein the high-temperature gas injection device is composed of at least one gas collecting box, the gas collecting box is an airtight box, and an air inlet is provided thereon And the air outlet, the air inlet is connected to the fan through a pipe, a jet plate is arranged at the air outlet, and the high-temperature gas spray holes are densely arranged on the jet plate, and the spray is arranged opposite to the heated glass plate, and is away from the heated glass At a proper distance from the surface of the board, at least one regenerative flame radiant tube heater is provided in each gas collecting box, and a temperature sensor is provided in each gas collecting box.

8. The convection glass heating furnace according to claim 7, wherein the jet plate is further provided with an exhaust gas recovery hole, and the exhaust gas recovery hole communicates with the inner cavity of the furnace outside the gas collection box through a pipe.

9. The convection glass heating furnace according to claim 8, wherein the spout plate is a wave-shaped plate, and the high-temperature gas spouting holes are distributed at the troughs near the ¾ hot glass surface. The exhaust gas recovery hole is provided at a wave peak far from the surface of the heated glass plate.

The convection glass heating furnace according to claim 9, wherein the two-digit four The pass valve corresponds to the gas collecting box. An air volume regulating valve is provided between each two-position four-way valve and the air supply pipe. Each of the gas collecting boxes has a regenerative flame radiant tube heater and A common proportional regulating valve is arranged between the fuel delivery pipes. The common proportional regulating valve is located on the gas delivery pipe upstream of the control valve, and the proportional regulating valve and the air volume regulating valve corresponding to the same gas collection tank are linked with each other.

The convection glass heating furnace according to claim 10, wherein the furnace body is horizontal and comprises an upper furnace body and a lower furnace body, and a roller-type glass plate conveying mechanism is installed on the lower furnace body, At least one of the gas collecting boxes is installed on the upper and lower furnace bodies of the mechanism, and the gas collecting boxes in the upper furnace body can be vertically installed on the upper furnace body through a suspension mechanism. The gas box is supported on a vertically movable lifting device provided in the lower furnace body. The suspension mechanism is a screw nut mechanism. The gas collection box is suspended on the screw by a nut, and the screw is fixed on the upper furnace body. The operating mechanism is connected on the top wall of the furnace body. The operating mechanism is a worm or worm operating mechanism, or a gear or sprocket operating mechanism. The lifting device is a screw and nut lifting mechanism. The gas collecting box is fixed with the nut and passes through The nut is connected to the screw, and the screw can be rotatably installed on the lower furnace body. The screw is connected to the worm wheel pot rod operating mechanism or the gear or sprocket operating mechanism, and can rotate under the control of the operating mechanism.