Low-carbon glass melting furnace adopting pre-melting pool

Abstract

The invention discloses a low-carbon glass melting furnace adopting a pre-melting pool, which relates to the technical field of glass manufacturing, solves the technical problem of reducing energy consumption, and comprises a pre-melting pool adopting electric melting or submerged combustion and a clarification pool communicated with the pre-melting pool and adopting flame combustion, a cold top structure is arranged in the upper space of the pre-melting tank, and the upper structure of the clarification tank adopts an arch structure and is hermetically connected with the upper space of the pre-melting tank through an L-shaped hanging wall; in the glass melting process, the silicate forming stage and the glass forming stage are completed in a pre-melting pool, and the molten glass clarifying stage is completed in a clarifying pool. A pre-melting pool is communicated with a clarification pool, electric melting or submerged combustion heating is adopted in the pre-melting pool, combustion space flame heating is adopted in the clarification pool, and a novel function partition structure is developed and designed in a targeted manner according to the fact that all stages of the glass melting process have different required effects on all areas of an energy supply area of the glass melting furnace. And the carbon emission and the energy consumption are obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of glass manufacturing, and particularly relates to a low-carbon glass melting furnace with a pre-melting tank. Background Art

[0002] In the process of glass production, as the core equipment, the energy consumption and carbon emission performance of the glass melting furnace have always been the focus of attention in the industry.

[0003] Currently, the structural forms of glass melting furnaces are generally divided into: flame-space heating glass melting furnaces, all-electric melting glass melting furnaces, and flame-space heating combined with auxiliary electric melting glass melting furnaces. They all have certain defects in terms of glass quality, energy consumption, and emissions respectively.

[0004] The flame-space heating glass melting furnace structure uses indirect flame heating in all stages of glass production, with low heating efficiency, large energy consumption, and large carbon emissions.

[0005] Although the all-electric melting glass melting furnace has the advantages of high heating efficiency and low carbon emissions, it has problems such as poor clarification and homogenization effects of the glass liquid, and difficulty in removing bubbles, which affect the glass quality and the finished product rate. At the same time, it is very difficult to scale up the all-electric melting glass furnace, and it is only suitable for the production of small-tonnage special glass.

[0006] The flame-space heating combined with auxiliary electric melting glass melting furnace combines the advantages of both to a certain extent. It adds partial auxiliary electric heating in the melting stage, but still mainly uses flame heating, and the effect of reducing energy consumption and carbon emissions is limited.

[0007] Patent CN107522387A discloses a melting furnace for TFT glass, including: a cold-top all-electric melting furnace and a clarification tank arranged in sequence. However, the cold-top all-electric melting furnace used to form glass is completely separated from the clarification tank structure, and is only connected by a flow-through hole. The melting and clarification of the glass liquid are completed independently in their respective furnaces. As a result, the glass liquid cannot form a melting and forming circulation system. At the same time, the all-electric melting furnace used for melting is difficult to mass-produce and is only suitable for the production of small-tonnage special glass. Therefore, a low-carbon glass melting furnace with a pre-melting tank is involved. Summary of the Invention

[0008] The purpose of the present invention is to provide a low-carbon glass melting furnace with a pre-melting tank, which is applicable to the production of various different scales and specifications of glass such as float glass, photovoltaic rolled glass, and glass fiber.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] A low-carbon glass melting furnace with a pre-melting tank includes a pre-melting tank using electric melting or submerged combustion and a clarification tank using flame combustion communicated with it;

[0011] A cold top structure is provided in the upper space of the pre-melting tank. The upper structure of the clarification tank adopts an arch structure and is hermetically connected to the upper space of the pre-melting tank through an L-shaped hanging wall;

[0012] During the glass melting process, the silicate formation stage and the glass formation stage are completed in the pre-melting tank, and the glass liquid clarification stage is completed in the clarification tank.

[0013] As a further scheme of the present invention: The pre-melting tank and the clarification tank have the same width and are of an integral structure.

[0014] As a further scheme of the present invention: A plurality of heating electrodes are arranged in the pre-melting tank, and the heating electrodes are inserted into the glass liquid.

[0015] As a further scheme of the present invention: A plurality of combustion nozzles are arranged in the pre-melting tank, and the combustion nozzles are installed on the bottom structure of the pre-melting tank.

[0016] As a further scheme of the present invention: The cold top structure adopts a hanging flat arch.

[0017] As a further scheme of the present invention: The inside of the clarification tank adopts a flame heating method, and a plurality of small furnace combustion systems with air-assisted combustion or an all-oxygen combustion system with oxygen-assisted combustion are arranged in the clarification tank.

[0018] As a further scheme of the present invention: A feeding port is provided at the front end of the pre-melting tank.

[0019] The beneficial effects of the present invention:

[0020] By connecting the pre-melting tank and the clarification tank, the present invention adopts electric melting or submerged combustion heating in the pre-melting tank and combustion space flame heating in the clarification tank. Combining the different requirements and functions of each stage of the glass melting process for the energy supply areas of each zone of the glass melting furnace, a new structure with functional zoning is developed and designed, significantly reducing carbon emissions and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is a front view structural schematic diagram of the present invention;

[0023] Figure 2 is a top view structural schematic diagram of the present invention.

[0024] In the figure: 1. Pre-melting tank; 2. Clarification tank; 3. Hanging flat arch; 4. L-shaped hanging wall; 5. Combustion space flame; 6. Heating electrode; 7. Feeding port. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] Please refer to Figure 1-2 As shown, the present invention is a low-carbon glass melting furnace with a pre-melting pool. The low-carbon glass melting furnace is built with different refractory materials, and the outside of the refractory materials is supported and enclosed by a steel structure. It includes a pre-melting pool 1 using electrofusion or submerged combustion and a clarification pool 2 connected to it and heated by the flame 5 in the combustion space; the glass liquid is directly heated by heating electrodes 6 or directly heated by submerged combustion fuel nozzles, and their heating efficiency reaches more than 90%, far higher than the heating efficiency of using the flame space heating, which can greatly reduce the energy consumption and carbon emissions in the glass liquid melting stage.

[0027] A cold top structure is arranged in the upper space of the pre-melting pool 1. The upper structure of the clarification pool 2 adopts an arch structure and is hermetically connected to the upper space of the pre-melting pool 1 through an L-shaped hanging wall 4, optimizing the space temperature field and glass liquid flow field of the glass melting furnace and enhancing the energy-saving effect;

[0028] During the glass melting process, the silicate formation stage and the glass formation stage are completed in the pre-melting pool 1, and the glass liquid clarification stage is completed in the clarification pool 2. The high-quality glass liquid clarified by the clarification pool 2 is sent to the forming equipment after cooling. That is, 60% or more of the energy used for glass melting is provided by the heating electrodes 6 or submerged burners, and the other 40% or less is supplied by the fuel through the flame 5 in the combustion space.

[0029] The pre-melting pool 1 is of the same width as the clarification pool 2 and is an integral structure, forming a complete glass melting pool. The flow of the glass liquid can form a melting and forming circulation. The present invention is applicable to the production of various glasses of different scales and specifications such as float glass, photovoltaic rolled glass, and glass fiber.

[0030] Multiple heating electrodes 6 are arranged in the pre-melting pool 1, and the heating electrodes 6 are inserted into the glass liquid.

[0031] Multiple combustion nozzles are arranged in the pre-melting pool 1, and the combustion nozzles are installed on the bottom structure of the pre-melting pool 1.

[0032] The cold top structure adopts a hanging flat arch 3 to avoid heat dissipation from the high-temperature arch top.

[0033] In the clarifier 2, a flame heating method is adopted, and a combustion space flame 5 is arranged inside. A number of small furnace combustion systems with air combustion support or oxy-fuel combustion systems with oxygen combustion support are arranged in the clarifier 2. It provides the energy required for the glass liquid clarification stage, can flexibly adjust the different atmosphere requirements required for the glass liquid clarification stage, increases the surface temperature of the glass liquid, helps the bubbles in the glass liquid to be discharged, and ensures the quality of the glass liquid.

[0034] A feeding port 7 is provided at the front end of the pre-melting tank 1.

[0035] To complete the complete glass melting process, the low-carbon glass melting furnace structure further includes a cooling structure for cooling the melted, clarified glass liquid.

[0036] The low-carbon glass melting furnace further includes a batch feeding system required for operation. A temperature and pressure detection and control system required for operation. A cooling water and cooling air system required for operation. An exhaust gas emission system and an environmental protection system required for operation.

[0037] The working principle of the present invention: The glass batch is fed into the pre-melting tank 1 through the feeding port 7, and under the heating of the heating electrode 6 with an efficiency exceeding 90% or submerged combustion heating, the melting process from the glass batch to the formation of glass liquid is completed; it enters the clarifier 2, and through the heating of the combustion space flame 5, the space atmosphere and the liquid flow distribution can be precisely controlled, the bubbles are discharged, and the clarification effect of the glass liquid is ensured; the clarified glass liquid enters the forming equipment after cooling.

[0038] In summary, compared with the traditional glass furnace, the low-carbon glass melting furnace of the present invention has an efficient and low-emission glass melting process and ensures the glass quality clarification process. According to the requirements of different stages, different furnace structure designs are adopted and scientifically combined to achieve low-carbon emissions and low-energy consumption production of the glass furnace.

[0039] The above has described in detail an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A low carbon glass melting furnace using a pre-melting pool, characterized in that: It comprises a pre-melting tank (1) using electric melting or immersion combustion and a clarification tank (2) connected thereto using flame combustion; The upper space of the pre-melting tank (1) is provided with a cold roof structure, the upper structure of the clarification tank (2) adopts an arch structure, and is sealed and connected to the upper space of the pre-melting tank (1) via an L-shaped hanging wall (4); In the glass melting process, the silicate formation stage and the glass formation stage are completed in the pre-melting tank (1), and the glass liquid clarification stage is completed in the clarification tank (2).

2. A low carbon glass melting furnace using a pre-melting pool according to claim 1, characterized in that: The pre-melting tank (1) and the clarification tank (2) are of equal width and are an integrated structure.

3. A low carbon glass melting furnace using a pre-melting pool according to claim 1, characterized in that: A plurality of heating electrodes (6) are arranged in the pre-melting pool (1), and the heating electrodes (6) are inserted into the glass liquid.

4. A low carbon glass melting furnace using a pre-melting pool according to claim 1, characterized in that: A plurality of combustion nozzles are arranged in the pre-melting pool (1), and the combustion nozzles are installed on the bottom structure of the pre-melting pool (1).

5. The low carbon glass melting furnace using a pre-melting pool according to claim 1, characterized in that: The cold roof structure adopts a suspended flat arch (3).

6. The low carbon glass melting furnace using a pre-melting pool according to claim 1, characterized in that: The clarifier (2) adopts a flame heating method, and a plurality of small furnace combustion systems with air-assisted combustion or a full oxygen combustion system with oxygen-assisted combustion are arranged in the clarifier (2).

7. The low carbon glass melting furnace using a pre-melting pool according to claim 1, characterized in that: The front end of the pre-melting pool (1) is provided with a feeding port (7).

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