A tempered glass heating furnace energy-saving utilization system

Abstract

The present invention discloses an energy-saving utilization system for a tempered glass heating furnace, comprising a sealed heating furnace body, wherein the furnace body is provided with through holes for tempered glass and rollers to enter and exit on both sides, wherein a preheating zone, a heating zone and a cooling zone are sequentially arranged in the heating furnace body according to the direction of the tempered glass heating, wherein a hot air drainage branch pipe is arranged in the cooling zone and connected to the preheating zone through a fan; the exhaust flue gas in the preheating zone is connected to a second heat exchanger through a fan, and the second heat exchanger is connected to a third heat exchanger through a pipeline. The present invention has the following advantages: the exhaust waste heat of the three working zones in the production process is fully recovered, and a large amount of cold air from the outside can be prevented from entering the furnace in a sealed space, resulting in increased energy consumption; at the same time, the preheating temperature of the tempered glass is increased, further energy saving and consumption reduction can be achieved; the waste heat of the kiln can be fully utilized, which can not only save operating costs, but also reduce the emission of gaseous pollutants.

Description

Technical Field

[0001] The invention relates to the technical field of tempered glass production, in particular to an energy-saving utilization system of a tempered glass heating furnace. Background Art

[0002] Tempered glass is a kind of prestressed glass. Its production principle is to process annealed glass into the required size and shape, heat it to the softening point temperature, and then quench it. Tempered glass has high mechanical strength, impact strength and bending strength, and has good safety and thermal stability. It is the most commonly used safety glass variety. Therefore, tempered glass is widely used in construction, automobiles, home appliances, furniture, electronics and instruments.

[0003] At present, there are two main production processes for tempered glass: physical tempering and chemical tempering. Physical tempered glass is mainly made by heating ordinary flat glass in a heating furnace to a temperature close to the softening temperature of the glass, eliminating internal stress through self-deformation, and finally undergoing quenching treatment. Chemical tempered glass generally improves the strength of the glass by changing the chemical composition of the glass surface through ion exchange. Compared with physical tempered glass, chemical tempered glass has a long production cycle, low efficiency and high production cost. Therefore, most tempered glass production currently uses physical tempering methods to prepare tempered glass.

[0004] In the physical tempering production process of existing tempered glass, the cleaned glass is placed horizontally on a roller and sent into a tempered glass heating furnace through the roller for heating treatment. The traditional heating furnace only has a heating zone (divided into the first zone and the second zone) and a cooling zone (the third zone): the first zone: the heating temperature is 450-500°C and the heating time is 100-250s; the second zone: the heating temperature is 680-700°C and the heating time is 200-300s; the third zone (cooling zone): the temperature drops below 500°C. In the above-mentioned tempered glass heating furnace, each zone heats up or cools down according to its own heating method, and then discharges the high-temperature waste heat flue gas directly into the atmosphere, which consumes energy and pollutes the environment, and increases production costs, which urgently needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide an energy-saving utilization system for a tempered glass heating furnace in response to the deficiencies in the prior art described above, which increases the preheating interval, comprehensively recovers the waste heat emitted from each interval, optimizes the heating method, and achieves the effect of energy conservation, emission reduction and lowering production costs while ensuring product quality.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: a tempered glass heating furnace energy-saving utilization system, including a closed heating furnace body, through holes for tempered glass and rollers to enter and exit are arranged on both sides of the heating furnace body, and a preheating zone, a heating zone and a cooling zone are arranged in sequence in the heating direction of the tempered glass. The cooling zone is provided with a hot air drainage branch pipe connected to the preheating zone through a fan; a fan is arranged at the roller and glass outlet through holes of the cooling zone to blow outdoor cold air into the cooling zone to force cooling of the tempered glass therein; the exhaust flue gas in the preheating zone is connected to the second heat exchanger through the fan, and the second heat exchanger is connected to the third heat exchanger through a pipeline.

[0007] The water tank is connected to the water inlet of the second heat exchanger through a pipeline, the water outlet of the second heat exchanger is connected to the water inlet of the steam generator, the steam outlet of the steam generator is connected to the inlet of the screw generator, and the outlet of the screw generator is connected to the water tank through a return pipeline. The water in the water tank is heated to about 150°C after heat exchange through the second heat exchanger, and generates steam at about 380°C after passing through the steam generator, which pushes the condensed water formed after the screw generator generates work to flow back into the water tank, forming a power generation cycle.

[0008] A water replenishment branch is provided to be connected to the water tank through the third heat exchanger to replenish the water lost in the power generation cycle.

[0009] The exhaust pipe of the heating zone is connected to the air inlet of the first heat exchanger, the air outlet of the first heat exchanger is connected to the air inlet of the steam generator through the third fan, the air outlet of the steam generator is connected to the second air inlet of the third heat exchanger, and then discharged through the chimney.

[0010] A temperature regulating pipeline is set to be connected with the air inlet of the first heat exchanger through the fourth fan, and the air outlet of the first heat exchanger is connected with the air balancing duct on the heating zone, so as to spray hot air into the heating zone at high speed, stir the airflow in the heating zone, and force the heat generated by the electric heater arranged in the heating zone to be transferred to the tempered glass. At the same time, it is used to adjust the temperature of the heating zone to keep it uniform from top to bottom, and at the same time replenish the air leaking from the partition in the heating zone into the cooling zone.

[0011] The air balancing duct is installed above the roller in the heating zone, 80 to 200 mm away from the surface of the tempered glass.

[0012] Preferably, a plurality of air outlet holes are arranged on the air balancing duct, and the diameter of the air outlet holes is 3-5 mm.

[0013] The heating zone is divided into a front section and a rear section, and temperature measuring devices are respectively installed in the front section and the rear section.

[0014] The air balancing duct consists of two groups, a front section and a rear section. A control valve is installed on the main pipe of each group. According to the temperature feedback from the temperature measuring device of the front section or the rear section, the hot air flow rate is automatically adjusted to ensure that the temperature of the front and rear sections is maintained at a set constant value.

[0015] A partition may be provided between adjacent preheating zones, heating zones or cooling zones, and a through hole for passing the tempered glass and the roller is provided on the partition.

[0016] The power output end of the screw generator is connected to the fan and the control valve through electric wires to provide the power required for operation. After the power is generated, it is used for self-use, which can effectively save energy.

[0017] Compared with the prior art, the present invention has the following advantages: the waste heat discharged from two heating zones and one cooling zone of the tempered glass heating furnace in the production process is fully utilized to adjust the temperature, and a large amount of cold air from the outside can be prevented from entering the furnace in a closed space, causing increased energy consumption; at the same time, the preheating temperature of the tempered glass is increased, further saving energy and reducing consumption; the waste heat can be fully utilized, which can not only save operating costs, but also reduce the emission of gaseous pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a structural schematic diagram of an energy-saving utilization system for a tempered glass heating furnace. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings. The accompanying drawings are only used for illustrative purposes and should not be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. The positional relationships described in the accompanying drawings are only used for illustrative purposes and should not be construed as limiting the present invention.

[0020] A tempered glass heating furnace energy-saving utilization system, such as Figure 1As shown, it includes a basically closed and integrated heating furnace body, and only through holes for tempered glass and rollers to enter and exit are set on both sides of the heating furnace body. The preheating section 11, heating section 12 and cooling section 13 are sequentially set in the heating furnace body according to the direction of tempered glass heating. A partition can be set between adjacent preheating sections 11, heating sections 12 or cooling sections 13, and a through hole for tempered glass and rollers to pass through is set on the partition. A fifth fan 44 is set outside the cooling section 13, and the fifth fan 44 blows outdoor cold air into the cooling section 13 through the outlet through hole to forcefully cool the tempered glass therein, thereby improving the cooling effect and the quality of the tempered glass. The cooling zone 13 is provided with a hot air drainage branch pipe 8 connected to the preheating zone 11 through the first fan 46, which is used to recover part of the exhaust hot air in the cooling zone 13 and directly inject it into the preheating zone 11, and is used to preheat the glass entering the preheating zone 11, so as to increase the initial temperature of the glass and the uniformity of heating, thereby saving a lot of energy while improving the quality of the glass. Preferably, the hot air drainage branch pipe 8 uses 80%-90% of the exhaust hot air in the cooling zone 13 and injects it into the preheating zone 11 from the top. The hot flue gas exhausted from the preheating zone 11 is connected to the air inlet of the second heat exchanger 32 through the second fan 43, and the air outlet of the second heat exchanger 32 is connected to the first air inlet of the third heat exchanger 33 through a pipeline, and then discharged through the chimney. The water tank 9 is connected to the water inlet of the second heat exchanger 32 through a pipeline via a water pump 47, the water outlet of the second heat exchanger 32 is connected to the water inlet of the steam generator 5, the steam outlet of the steam generator 5 is connected to the inlet of the screw generator 6, and the outlet of the screw generator 6 is connected to the water tank 9 through a return pipeline 7. The medium (preferably water) in the water tank 9 is heated to about 150°C after passing through the second heat exchanger 32, and generates steam at about 380°C after passing through the steam generator 5. The steam passes through the screw generator 6 to drive the screw generator 6 to generate power, and then condenses to form water that flows back to the water tank 9, forming a closed power generation cycle. A water replenishment branch is set to be connected to the water tank 9 after being heated by the third heat exchanger 33, so as to replenish the water lost in the water tank 9 during the cycle power generation.

[0021] The exhaust pipe of the heating zone 12 is connected to the air inlet of the first heat exchanger 31, the air outlet of the first heat exchanger 31 is connected to the air inlet of the steam generator 5 through the third fan 41, the air outlet of the steam generator 5 is connected to the second air inlet of the third heat exchanger 33, and then discharged through the chimney. The exhaust flue gas of the heating zone 12 still has a high temperature of 500°C after heat exchange through the first heat exchanger 31, and then the preheated water is heated by the steam generator 5 to form high-temperature water vapor, and then discharged through the chimney after heat exchange through the third heat exchanger 33, which can effectively recover the exhaust waste heat of the heating zone 12 and make comprehensive use of it.

[0022] A temperature regulating pipeline 2 is provided under the action of the fourth blower 42, and then connected to the air balancing pipe 1 on the heating zone 12 after passing through the first heat exchanger 31, and hot air is sprayed into the heating zone 12 at a high speed of 30-50 m / s, stirring the air flow in the heating zone, and forcibly transferring the heat generated by the electric heater (not shown) arranged in the heating zone to the tempered glass, and at the same time, it is used to adjust the temperature of the heating zone 12 to keep it uniform from top to bottom, and at the same time, replenish the air leaked from the partition in the heating zone 12 into the cooling zone 13 and the preheating zone 11. Preferably, the fourth blower 42 is a Roots blower.

[0023] The heating zone is divided into a front section and a rear section, and a temperature measuring device is installed in the front section and the rear section respectively. The air balancing duct is composed of two groups, the front section and the rear section, and a control valve is installed on the main pipe of each group. According to the temperature feedback from the temperature measuring device of the front section or the rear section, the hot air flow rate is automatically adjusted to ensure that the temperature of the front and rear sections is maintained at a set constant value.

[0024] Among them, a plurality of air outlet holes are arranged on the air balancing duct 1, and the diameter of the air outlet holes is 4 mm; the air balancing duct is installed above the roller table, and is 100 to 160 mm away from the surface of the tempered glass.

[0025] The power output end of the screw generator 6 is connected to the first fan, the second fan, the third fan, the fourth fan, the fifth fan and the control valve through electric wires to provide the power required for operation. After generating electricity, it is used for self-use, which can effectively save energy.

[0026] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A tempered glass heating furnace energy-saving utilization system, characterized in that: The invention comprises a sealed heating furnace body, and through holes for tempered glass and rollers to enter and exit are arranged on both sides of the heating furnace body. A preheating zone, a heating zone and a cooling zone are arranged in sequence in the heating direction of the tempered glass. A hot air drainage branch pipe is arranged in the cooling zone and connected with the preheating zone through a fan; the exhaust flue gas in the preheating zone is connected with the second heat exchanger through the fan, and the second heat exchanger is connected with the third heat exchanger through a pipeline; the water tank is connected with the water inlet of the second heat exchanger through a pipeline, and the water outlet of the second heat exchanger is connected with the water inlet of the steam generator. The steam outlet of the steam generator is connected to the inlet of the screw generator, and the outlet of the screw generator is connected to the water tank through a reflux pipeline; the discharge pipe of the heating zone is connected to the air inlet of the first heat exchanger, and the air outlet of the first heat exchanger is connected to the air inlet of the steam generator through a third fan, and the air outlet of the steam generator is connected to the second air inlet of the third heat exchanger; a temperature regulating pipeline is set to be connected to the air inlet of the first heat exchanger through a fourth fan, and the air outlet of the first heat exchanger is connected to the air balancing duct arranged above the heating zone.

2. The energy-saving utilization system for a tempered glass heating furnace according to claim 1, characterized in that: A water supply branch is provided to be connected to the water tank through the third heat exchanger.

3. The energy-saving utilization system for a tempered glass heating furnace according to claim 1, characterized in that: The air balancing duct is installed above the roller in the heating zone, 80 to 200 mm away from the surface of the tempered glass.

4. The energy-saving utilization system for a tempered glass heating furnace according to claim 3 is characterized in that: The heating zone is divided into a front section and a rear section, and temperature measuring devices are respectively installed in the front section and the rear section.

5. The energy-saving utilization system for a tempered glass heating furnace according to claim 4, characterized in that: The air balancing duct consists of two groups, a front section and a rear section. A control valve is installed on the main pipe of each group. According to the temperature feedback from the temperature measuring device of the front section or the rear section, the hot air flow rate is automatically adjusted to ensure that the temperature of the front and rear sections is maintained at a set constant value.

6. The energy-saving utilization system for a tempered glass heating furnace according to claim 1, characterized in that: A partition is provided between adjacent preheating zones, heating zones or cooling zones, and a through hole for the roller to pass through is provided on the partition.

7. The energy-saving utilization system for a tempered glass heating furnace according to claim 1, characterized in that: The power output end of the screw generator is connected to the fan and the control valve through electric wires.

Images