Composite heat-insulating structure of glass electric melting furnace

Abstract

The utility model discloses a kind of glass electric melting furnace composite heat preservation structures, including glass electric melting furnace main body, the glass electric melting furnace main body is sequentially arranged from inside to outside working layer, transition layer, heat insulation layer and outer protective layer composition;The working layer is made of electric melting zirconia corundum brick, the transition layer is made of light mullite brick, the heat insulation layer is made of microporous heat insulation plate and ceramic fiber module, the ceramic fiber module covers in microporous heat insulation plate outside, the outer protective layer is made of galvanized steel sheet, by galvanized steel sheet play to the effect of moisture-proof and corrosion-proof, the ceramic fiber module is fixed in the inner side of outer protective layer by stainless steel anchor, air passage is arranged between the outer protective layer and heat insulation layer.The utility model effectively reduces the temperature of glass electric melting furnace main body surface, and reduces heat loss, realizes the integrated effect of heat insulation, heat preservation and sealing.

Description

Technical Field

[0001] This utility model relates to the field of glass melting equipment technology, specifically a composite insulation structure for a glass electric melting furnace. Background Technology

[0002] An electric glass melting furnace is a key piece of equipment that uses electricity as a heat source to melt glass raw materials into a uniform molten glass. Its core principle is to directly introduce current into the glass batch or molten glass through electrodes, utilizing the glass's own resistance to convert electrical energy into heat energy, achieving efficient melting. Compared to traditional flame furnaces, electric melting furnaces offer advantages such as high thermal efficiency (up to 70% or more), uniform melting temperature (temperature difference ≤5℃), no combustion exhaust emissions, and suitability for small-batch and specialty glass production. They are particularly suitable for fields with stringent quality requirements, such as high-precision optical glass, pharmaceutical glass, and borosilicate fire-resistant glass.

[0003] Its structure typically includes an electrode system, a melting pool, an insulation layer, and a control system. The electrodes are made of molybdenum or platinum-rhodium alloy, which are high-temperature resistant and highly conductive. The melting pool is constructed of corrosion-resistant materials such as fused zirconia-corundum bricks. The insulation layer reduces heat loss through composite structures such as nanoporous insulation boards and ceramic fiber modules. The control system can precisely adjust the current, voltage, and temperature curves. The widespread application of electric melting furnaces has significantly reduced energy consumption and pollutant emissions in glass production, representing an important technological direction for the glass industry's green and low-carbon transformation.

[0004] However, in practical applications, the existing technology for traditional glass electric melting furnaces often uses single-layer refractory bricks or aluminosilicate fiber felt for insulation. The defects include: limited insulation performance, large heat conduction loss at high temperatures, easy cracking at the interface between the refractory material and the insulation layer leading to insulation failure, excessively high furnace surface temperature, safety hazards, and serious heat loss. Utility Model Content

[0005] The purpose of this utility model is to provide a composite insulation structure for glass electric melting furnaces, in order to solve the problems mentioned in the background art. Traditional glass electric melting furnace insulation structures mostly use single-layer refractory bricks or aluminosilicate fiber felt, which have the following defects: single insulation performance, large heat conduction loss at high temperatures, easy cracking of the interface between refractory material and insulation layer leading to insulation failure, excessively high furnace surface temperature, safety hazards and serious heat loss.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a glass electric melting furnace body, wherein the glass electric melting furnace body is composed of a working layer, a transition layer, a heat insulation layer and an outer protective layer arranged sequentially from the inside to the outside;

[0007] The working layer is made of fused zirconia-corundum bricks, the transition layer is made of lightweight mullite bricks, the insulation layer is composed of microporous insulation boards and ceramic fiber modules, the ceramic fiber modules cover the outside of the microporous insulation boards, the outer protective layer is made of galvanized steel sheets, which serve to prevent moisture and corrosion, the ceramic fiber modules are fixed to the inside of the outer protective layer by stainless steel anchors, and an air channel is provided between the outer protective layer and the insulation layer.

[0008] Preferably, the transition layer and the working layer are bonded together using masonry and high-temperature inorganic adhesive.

[0009] Preferably, the inner wall of the microporous heat insulation board is coated with a low emissivity coating, and the microporous heat insulation board and the transition layer are bonded together by high-temperature adhesive.

[0010] Preferably, there are several ceramic fiber modules, which are symmetrically distributed around the outer end of the microporous heat insulation plate, and the outer side of each ceramic fiber module is provided with a docking groove and a docking protrusion.

[0011] Preferably, the surface of the anchor is coated with an alumina coating, and the outer end of the outer protective layer is coated with a ceramic coating.

[0012] Preferably, a temperature sensor is fixedly installed inside the air channel, and an openable heat dissipation valve for linkage with the temperature sensor is provided at the outer end of the air channel.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention allows the working layer to directly contact molten glass at 1500-1600℃. The dense crystalline structure formed by the electrofused zirconia-corundum bricks controls the thermal conductivity coefficient to 1.5-2.0 W / (m·K), while simultaneously improving resistance to molten glass corrosion by three times compared to traditional alumina-silica bricks. The transition layer, made of lightweight mullite bricks with a porosity exceeding 70%, utilizes the low thermal conductivity of air to construct a first-level thermal barrier, reducing heat transfer efficiency. The insulation layer consists of a microporous insulation plate and ceramic fiber modules. The microporous insulation plate has an internal pore size of <50nm, far smaller than the mean free path of air molecules (approximately 70nm), virtually eliminating gas convection heat transfer. The gaps in the microporous insulation plate covered by the ceramic fiber modules extend the heat transfer path.

[0015] This invention also reduces radiative heat loss by up to 60% through the outer protective layer and ceramic coating. The galvanized steel plate reflects visible light radiation, while the ceramic coating reflects infrared radiation back into the furnace. The combination of air channels and heat dissipation valves prevents the insulation layer from overheating and failing under extreme conditions, thereby effectively reducing the surface temperature of the glass electric melting furnace and reducing heat loss, achieving an integrated function of heat insulation, heat preservation, and sealing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a composite insulation structure for a glass electric melting furnace according to the present invention;

[0017] Figure 2 This is a cross-sectional schematic diagram of the overall structure of the composite insulation structure for a glass electric melting furnace according to this utility model;

[0018] Figure 3 This is a partial structural schematic diagram of a composite insulation structure for a glass electric melting furnace according to the present invention.

[0019] In the diagram: 1. Main body of glass electric melting furnace; 101. Working layer; 102. Transition layer; 103. Insulation layer; 1031. Microporous insulation board; 1032. Ceramic fiber module; 104. Outer protective layer; 105. Air channel; 106. Heat dissipation valve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-3 This utility model provides a composite insulation structure technical solution for a glass electric melting furnace: it includes a glass electric melting furnace body 1, which is composed of a working layer 101, a transition layer 102, a heat insulation layer 103 and an outer protective layer 104 arranged sequentially from the inside to the outside.

[0022] The working layer 101 is made of fused zirconia-corundum bricks, allowing direct contact with the molten glass. When in direct contact, the fused zirconia-corundum bricks provide high-temperature resistance and corrosion resistance. The transition layer 102 is made of lightweight mullite bricks, bonded to the working layer 101 using a combination of bricklaying and high-temperature inorganic adhesive. This reduces heat conduction within the glass melting furnace body 1. The insulation layer 103 consists of a microporous insulation board 1031 and ceramic fiber modules 1032. The inner wall of the microporous insulation board 1031 is coated with a low-emissivity coating to reflect infrared radiation. The microporous insulation board 1031 is bonded to the transition layer 102 using high-temperature adhesive to prevent interface slippage. The ceramic fiber modules 1032 cover the microporous insulation board 1031. At the outer end of 31, there are several ceramic fiber modules 1032, which are symmetrically distributed sequentially at the outer end of the microporous heat insulation plate 1031. The ceramic fiber modules 1032 buffer the thermal stress of the microporous heat insulation plate 1031. The outer side of the ceramic fiber modules 1032 is provided with mating grooves and mating protrusions, so that several ceramic fiber modules 1032 can be interlocked and connected through the mating grooves and mating protrusions, so that several ceramic fiber modules 1032 can be quickly spliced ​​together. The outer protective layer 104 is made of galvanized steel plate, which serves to prevent moisture and corrosion. The ceramic fiber modules 1032 are fixed to the inner side of the outer protective layer 104 by stainless steel anchors. The surface of the anchors is coated with an aluminum oxide coating to prevent high-temperature oxidation of the anchor surface. The outer end of the outer protective layer 104 is coated with a ceramic coating, which reduces radiative heat dissipation.

[0023] An air channel 105 is provided between the outer protective layer 104 and the heat insulation layer 103, and a temperature sensor is fixedly installed inside the air channel 105. An openable heat dissipation valve 106 is provided at the outer end of the air channel 105 for linkage with the temperature sensor, so that the heat dissipation valve 106 can be opened or closed in conjunction with the temperature sensor to prevent the heat insulation layer 103 from overheating and failing under extreme conditions.

[0024] Working Principle: In use, this utility model directly contacts molten glass at 1500-1600℃ through the working layer 101. The dense crystalline structure formed by the electrofused zirconia-corundum brick controls the thermal conductivity coefficient to 1.5-2.0 W / (m·K), while simultaneously improving resistance to molten glass corrosion by 3 times compared to traditional alumina-silica bricks. The lightweight mullite brick in the transition layer 102, with a porosity exceeding 70%, utilizes the low thermal conductivity of air to construct a first-level thermal barrier, reducing heat transfer efficiency. The microporous insulation plate 1031 and ceramic fiber module 1032 in the insulation layer 103 further enhance heat transfer. The microporous insulation plate 1031 has an internal pore size <50nm, far smaller than the mean free path of air molecules (approximately 70nm), almost eliminating gas convection heat transfer. The ceramic fiber... The gaps in the microporous insulation plate 1031 covered by the micro-module 1032 extend the heat conduction path; through the outer protective layer 104 and the ceramic coating, the galvanized steel plate reflects visible light radiation, and the ceramic coating reflects infrared radiation back into the furnace, reducing radiative heat loss by up to 60%; the combination of the air channel 105 and the heat dissipation valve 106 prevents the insulation layer 103 from overheating and failing under extreme conditions, thereby effectively reducing the surface temperature of the glass electric melting furnace body 1 and reducing heat loss, achieving the integrated function of heat insulation, heat preservation and sealing.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite insulation structure for a glass electric melting furnace, characterized in that: The glass electric melting furnace body (1) is composed of a working layer (101), a transition layer (102), a heat insulation layer (103) and an outer protective layer (104) arranged sequentially from the inside to the outside. The working layer (101) is made of fused zirconia corundum brick, the transition layer (102) is made of lightweight mullite brick, the heat insulation layer (103) is composed of microporous heat insulation board (1031) and ceramic fiber module (1032), the ceramic fiber module (1032) covers the outside of microporous heat insulation board (1031), the outer protective layer (104) is made of galvanized steel plate, the galvanized steel plate plays the role of moisture and corrosion prevention, the ceramic fiber module (1032) is fixed to the inside of the outer protective layer (104) by stainless steel anchors, and an air channel (105) is provided between the outer protective layer (104) and the heat insulation layer (103).

2. The composite insulation structure for glass electric melting furnace according to claim 1, characterized in that: The transition layer (102) and the working layer (101) are bonded together by masonry and high-temperature inorganic adhesive.

3. The composite insulation structure for glass electric melting furnace according to claim 2, characterized in that: The inner wall of the microporous heat insulation plate (1031) is coated with a low emissivity coating, and the microporous heat insulation plate (1031) and the transition layer (102) are bonded together by high-temperature adhesive.

4. The composite insulation structure for glass electric melting furnace according to claim 3, characterized in that: There are several ceramic fiber modules (1032), which are symmetrically distributed around the outer end of the microporous heat insulation plate (1031). The outer side of each ceramic fiber module (1032) is provided with a docking groove and a docking protrusion.

5. The composite insulation structure for a glass electric melting furnace according to claim 4, characterized in that: The surface of the anchor is coated with an alumina coating, and the outer end of the outer protective layer (104) is coated with a ceramic coating.

6. The composite insulation structure for a glass electric melting furnace according to claim 5, characterized in that: A temperature sensor is fixedly installed inside the air channel (105), and an openable heat dissipation valve (106) for linkage with the temperature sensor is provided at the outer end of the air channel (105).

Images