A large-tonnage ultra-white rolled glass melting furnace

Abstract

A large-tonnage ultra-white rolled glass melting furnace comprises a melting part, small furnaces are arranged on both sides of the melting part to heat the melting part, side-fired small furnaces and bottom-fired small furnaces are arranged on both sides of the melting part, and the side-fired small furnaces and bottom-fired small furnaces are arranged in groups; the application solves the problem that in traditional glass melting furnaces, the same kiln uses a single small furnace structure that cannot meet the requirements that different parts of special glass melting furnaces need different combustion atmospheres and different small furnaces need to match different spray guns, and provides a new type of small furnace arrangement method that can use multiple small furnace structures in the same glass melting furnace according to different parts, different load requirements, and different atmosphere requirements: the side-fired small furnace and the bottom-fired small furnace are used in the same glass melting furnace at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of production equipment of glass melting furnaces, and in particular relates to a large-tonnage ultra-white rolled glass melting furnace. Background Art

[0002] With the emergence of various new glass products, the structure of glass melting furnaces has undergone various changes to adapt to different products; at the same time, various new fuels have emerged, and these new fuels have also been widely used in glass melting furnaces; with the changes in products, structures and fuels, a glass melting furnace structure that can be compatible with the combustion of multiple fuels is needed to meet production needs, and at the same time, it can meet the low-cost production requirements in terms of energy selection, that is, without changing the structure, a variety of heating and combustion methods can be used;

[0003] There are several types of glass melting furnace combustion structures: all-oxygen furnace, electric melting furnace and melting furnace with small furnace combustion. Among them, all-oxygen furnace and electric melting furnace belong to glass melting furnace without small furnace melting furnace structure;

[0004] For glass melting furnaces with small furnace structures, the combustion methods are divided into side burning, bottom burning, bottom plugging, top plugging and other forms according to the different insertion positions of the spray guns. These forms are used in combination on the same small furnace, such as side burning plus bottom plugging. At this time, the bottom plugging is used for the combustion of backup fuels, the side burns natural gas, and the bottom plugs heavy oil and other liquid backup fuels;

[0005] As market demand increases, it is an inevitable technological trend to realize the production of ultra-white rolled glass in glass melting furnaces with a tonnage of 1,000 tons or more, thereby reducing costs, improving fuel utilization, and obtaining the advantages of large-scale low-cost production;

[0006] Ultra-clear rolled glass has very high requirements for glass color. The ultra-clear rolled glass produced by the bottom-fired small furnace structure is green in color, which cannot meet market demand and is not competitive.

[0007] However, the production of ultra-clear rolled glass in the form of side firing in glass melting furnaces with a tonnage of 1,000 tons or more faces the following technical obstacles:

[0008] Existing glass melting furnaces only use one type of small furnace structure, side-fired small furnace or bottom-fired; after upgrading to a large tonnage, the energy consumption of the side-fired small furnace is higher than that of the bottom-fired small furnace, making the production cost of ultra-white rolled glass too high; and in order to meet the heating load requirements of large tonnage, after the load of the small furnace increases, the two spray guns are prone to burn the breast wall and the side wall of the small furnace. This is because the distance between the side-fired flame and the wall is much smaller than the distance between the bottom-fired flame and the wall; the high heating load makes the side-fired small furnace of the glass melting furnace of 1,000 tons and above either unable to meet the heating requirements or frequently burn the inner wall of the furnace body;

[0009] For ordinary large-tonnage melting furnaces, due to the different combustion structures of small furnaces, the breast wall heights of the melting furnaces are different, which will also increase the space required for production.

[0010] However, when using a side-fired small furnace, as the tonnage increases, the heat load increases, causing the opposite side wall of the side-fired small furnace to be damaged by high temperature, and the production and maintenance cost is too high. In the application of glass melting furnaces of 1,000 tons and above, the production cost cannot be borne. In other words, the loss caused by the unit output of the side-fired small furnace of a high-tonnage glass melting furnace is much greater than the loss caused by the unit output of the side-fired small furnace of a low-tonnage glass melting furnace.

[0011] Authorization announcement number: CN204999796U, discloses a glass melting furnace full oxygen combustion spray gun suitable for multiple fuels, which is suitable for multiple fuels and can adjust the flame length. By providing a natural gas chamber outside the inner fuel (petroleum coke powder or heavy oil) chamber, oxygen and natural gas are mixed and fully burned at the outlet, thereby avoiding the problem of incomplete combustion of powdered fuels such as petroleum coke powder and causing clogging of the spray gun port. By providing a positioning mechanism, the front and rear positions of the fuel chamber, the oxygen chamber and the natural gas chamber can be adjusted, thereby achieving the adjustment of the flame length;

[0012] Authorization announcement number: CN1022233C, discloses a method for manufacturing glass, which includes introducing a mixture of glass production raw materials, fuel and an oxidizing gas into a substantially vertical cylindrical preheating chamber, burning the fuel and the oxidizing gas to preheat the glass production raw materials, and then introducing the heated mixture into a cyclone melter, in which the glass production raw materials are melted and separated from the combustion and other gases; according to one aspect of the present invention, the oxidizing gas is injected into the preheating chamber at least at two vertically spaced positions and flows in opposite directions, thereby forming two convection vortex zones in the chamber, whereby the glass production raw materials and the burning fuel are intensively mixed and melted quickly and evenly;

[0013] The above-mentioned prior art, in which ultra-white rolled glass is produced in glass melting furnaces with a tonnage of 1,000 tons or more, does not provide technical measures to solve the problem of excessive loss in small furnaces due to side firing under high heat load, and therefore needs to be improved. Summary of the invention

[0014] In view of this, facing the shortcomings of the prior art, the purpose of the present invention is to provide a large-tonnage ultra-white rolled glass melting furnace, which has different small furnace structures that are compatible with multiple combustion methods. Different small furnace structures can be arranged according to different parts and atmosphere requirements of the glass melting furnace to meet the atmosphere requirements, with low energy consumption and high product quality.

[0015] To achieve the above-mentioned purpose and other related purposes, the present invention provides a large-tonnage ultra-white rolled glass melting furnace, including a melting section, small furnaces are arranged on both sides of the melting section to heat the melting section, side-fired small furnaces and bottom-fired small furnaces are arranged on both sides of the melting section, and the side-fired small furnaces and bottom-fired small furnaces are arranged in groups.

[0016] A technical solution provided by this application also has the following technical features:

[0017] Preferably, the breast walls of the side-fired small furnace and the bottom-fired small furnace have the same height.

[0018] Preferably, along the material incoming direction of the melting section, the bottom-fired small furnace and the side-fired small furnace are arranged in sequence, the bottom-fired small furnace is arranged in the front section of the hot spot of the melting section, and the side-fired small furnace is arranged in the rear section of the hot spot of the melting section.

[0019] Preferably, a side-firing spray gun is arranged on the side wall of the side-firing small furnace, a furnace bottom spare gun insertion slot is arranged on the bottom of the side-firing small furnace, and a bottom-firing spray gun is arranged on the bottom of the bottom-firing small furnace.

[0020] Preferably, both sides of the melting portion are divided into a high-load section and a low-load section, wherein the high-load section refers to a section where the thermal load is greater than an average load value, and the low-load section refers to a section where the thermal load is less than the average load value.

[0021] Preferably, the bottom-fired small furnace is arranged in the high-load section, and the side-fired small furnace is arranged in the low-load section.

[0022] A layout method for a large-tonnage ultra-white rolled glass melting furnace, according to the tonnage and heat load requirements of the glass melting furnace, along the material incoming direction of the melting section, a bottom-fired small furnace and a side-fired small furnace are arranged in sequence on both sides of the melting section, the bottom-fired small furnace is arranged in front of the hot spot of the melting section, and the side-fired small furnace is arranged behind the hot spot of the melting section.

[0023] Preferably, one bottom-fired small furnace is removed, and the remaining bottom-fired small furnaces are arranged at equal intervals, and the widths of the bottom-fired crater openings of the remaining bottom-fired small furnaces are increased.

[0024] Preferably, a bottom-fired small furnace is arranged at a large load, and each bottom-fired small furnace is provided with 3-4 spray guns; a side-fired small furnace is arranged at a small load, and each side-fired small furnace is provided with 2 spray guns.

[0025] Preferably, along the material incoming direction of the melting section, the bottom-fired small furnace and the side-fired small furnace are arranged in sequence on both sides of the melting section, or along the material incoming direction of the melting section, the bottom-fired small furnace and the side-fired small furnace are arranged in sequence and interchangeably on both sides of the melting section.

[0026] The beneficial effects of the present invention are:

[0027] The present application solves the problem that a single small furnace structure used in a traditional glass melting furnace cannot meet the requirements of different parts of a special glass melting furnace requiring different combustion atmospheres and different small furnaces needing to match different spray guns, and provides a new type of small furnace arrangement method that can use multiple small furnace structures in the same glass melting furnace according to different parts, different load requirements, and different atmosphere requirements: a side-fired small furnace and a bottom-fired small furnace are used in the same glass melting furnace at the same time;

[0028] 1. Arranging different small furnace structures at different positions of the melting furnace can flexibly adjust the combustion atmosphere in the furnace, reducing atmosphere or oxidizing atmosphere to meet the quality requirements of various glass products;

[0029] 2. According to the load size of different small furnaces, you can freely choose to arrange different small furnace structures. At high loads, use a bottom-burning small furnace structure and set up 3-4 spray guns. At low loads, use a side-burning small furnace structure and set up 2 spray guns, which reduces the number of spray guns in the small furnace and saves investment costs.

[0030] 3. According to the different combustion requirements of different fuels, select a variety of small furnace structures to match the fuel combustion, so that different fuels can be mixed in the same glass melting furnace. For example, cheaper liquid fuel is used in the small furnace before the hot spot to save fuel costs, and more expensive but cleaner gas fuel is used in the small furnace after the hot spot to ensure glass quality;

[0031] 4. The number of bottom-burning small furnaces and side-burning small furnaces can be freely selected, which can appropriately reduce energy consumption and save operating costs;

[0032] Scope of application: The glass melting furnace structure of the present invention has a wide scope of application, and can be used in both float glass melting furnaces and rolled glass melting furnaces. The effect is more significant when applied to large-tonnage glass melting furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a top view of a large-tonnage ultra-white rolled glass melting furnace of the present invention;

[0034] Figure 2 It is an AA cross-sectional view of a large-tonnage ultra-white rolled glass melting furnace of the present invention;

[0035] Figure 3 It is a BB cross-sectional view of a large-tonnage ultra-white rolled glass melting furnace of the present invention;

[0036] In the figure:

[0037] 1. Melting section

[0038] 2. Hotspot

[0039] 3. Side burning spray gun

[0040] 4. Bottom firing spray gun

[0041] 5. Spare gun slot at the bottom of the furnace

[0042] 6. Crater

[0043] 7. Hook brick

[0044] 11. Thermal storage chamber

[0045] 12. Side-burning small furnace

[0046] 13. Bottom-burning small furnace. DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0051] like Figure 1-3 A large-tonnage ultra-white rolled glass melting furnace comprises a melting section 1, small furnaces are arranged on both sides of the melting section 1 to heat the melting section 1, side-fired small furnaces 12 and bottom-fired small furnaces 13 are arranged on both sides of the melting section 1, and the side-fired small furnaces 12 and bottom-fired small furnaces 13 are arranged in groups;

[0052] The regenerator 11 is used to discharge the exhaust gas from the small furnace on the opposite side and heat the incoming air from the small furnace on the adjacent side, so that the heat released by combustion is greater;

[0053] Specifically, the breast walls of the side-fired small furnace 12 and the bottom-fired small furnace 13 have the same height; along the incoming direction of the melting part 1, the bottom-fired small furnace 13 and the side-fired small furnace 12 are arranged in sequence, that is, along the incoming direction of the melting part 1, the bottom-fired small furnace 13 is arranged first, and the bottom-fired small furnace 13 is arranged at the front section of the hot spot 1 of the melting part 1, and then the side-fired small furnace 12 is arranged, and the side-fired small furnace 12 is arranged at the rear section of the hot spot 2 of the melting part 1; the side wall of the side-fired small furnace 12 is provided with a side-fired spray gun 3, the bottom of the side-fired small furnace 12 is provided with a furnace bottom spare gun slot 5, and the bottom of the bottom-fired small furnace 13 is provided with a bottom-fired spray gun 4;

[0054] The two sides of the melting section 1 are divided into a high load section and a low load section. The high load section means that the heat load is greater than the average load value, and the low load section means that the heat load is less than the average load value; the bottom-fired small furnace 13 is set in the high load section, and the side-fired small furnace 12 is set in the low load section.

[0055] A layout method for a large-tonnage ultra-white rolled glass melting furnace, according to the tonnage and heat load requirements of the glass melting furnace, along the material incoming direction of a melting part 1, a bottom-fired small furnace 13 and a side-fired small furnace 12 are arranged in sequence, and the bottom-fired small furnace 13 and the side-fired small furnace 12 are arranged in sequence on both sides of the melting part 1, the bottom-fired small furnace 13 is arranged in the front section of the hot spot 2 of the melting part 1, and the side-fired small furnace 12 is arranged in the rear section of the hot spot 2 of the melting part 1;

[0056] One bottom-fired small furnace 13 is removed, and the spacings of the remaining bottom-fired small furnaces 13 are evenly distributed, and the widths of the bottom-fired crater openings of the remaining bottom-fired small furnaces 13 are increased.

[0057] Specifically, a bottom-fired small furnace 13 is arranged at a large load, and each bottom-fired small furnace 13 is provided with 3-4 spray guns; a side-fired small furnace 12 is arranged at a small load, and each side-fired small furnace 12 is provided with 2 spray guns.

[0058] Specifically, along the material supply direction of the melting part 1 , the bottom-fired small furnace 13 and the side-fired small furnace 12 are sequentially arranged on both sides of the melting part 1 .

[0059] Specifically, along the material supply direction of the melting part 1 , the bottom-fired small furnace 13 and the side-fired small furnace 12 are alternately arranged on both sides of the melting part 1 in sequence.

[0060] Specifically, taking a large-tonnage rolled glass melting furnace as an example, firstly, improvements are made on the arrangement of small furnaces: in front of the hot spot of the melting furnace, due to the high load of the small furnace, the small furnace before hot spot 2 adopts a bottom-fired small furnace form. The bottom-fired small furnace can freely choose the number of spray guns according to different loads. The large-load small furnace can choose four bottom-fired guns, which is conducive to better melting of the batch material and will not burn the side walls, breast walls and large arches of the small furnace due to heavy load; after the hot spot 2, since the load of the small furnace is not large, and because the ultra-white rolled glass has very high requirements for the color of the glass, in order to prevent the glass from turning green, it is hoped that the combustion atmosphere in the melting furnace is an oxidizing atmosphere. Therefore, the small furnace after the hot spot chooses a side-fired small furnace structure, which can not only control the atmosphere well but also reduce the number of spray guns. The amount is reduced, thus saving costs. Secondly, in terms of the kiln structure, the height of the breast wall 7 is adjusted, the height of the blast hole of the side-fired small furnace structure is increased, and the thickness of the hook brick 7 under the nozzle brick of the bottom-fired small furnace is reduced, so that the breast wall heights of the bottom-fired small furnace and the side-fired small furnace are kept consistent, solving the problem that the current melting furnace cannot be compatible with the side-fired structure and the bottom-fired structure due to the different breast wall heights, so that the bottom-fired small furnace and the side-fired small furnace can be used in one kiln at the same time. This new glass melting furnace structure not only meets the requirements of special products for the atmosphere in the kiln, but also can appropriately reduce energy consumption and save later operating costs. Moreover, the simultaneous use of the two small furnace structures can basically cover the combustion methods of most commonly used fuels: bottom-fired, side-fired, and bottom-inserted, making it easier to choose fuel.

[0061] like Figures 1 to 3 As shown, an embodiment of the glass melting furnace of the present invention; the glass melting furnace uses a bottom-fired small furnace 13 before the hot spot 2 in the melting part 1, see the attached Figure 3 , the small furnace bottom burning spray gun is inserted in the position of the bottom burning spray gun 4; the side burning small furnace 12 is used after the hot spot 2, see the attached Figure 2 The side-burning spray gun of the small furnace is inserted in the position of the side-burning spray gun 3, and the small furnace bottom-inserted spray gun can be used at the same time for the position of the spare gun insertion slot 5 at the bottom of the furnace. The height of the fire port 6 of the side-burning small furnace structure is appropriately increased, and the thickness of the hook brick 7 of the bottom-burning small furnace structure is appropriately reduced, so that the breast wall heights of the side-burning small furnace 12 and the bottom-burning small furnace 13 are consistent, thereby achieving the same melting furnace. Use a variety of different small furnace structures and a variety of different spray gun insertion methods, so that the glass melting furnace can adapt to a variety of fuels, control the combustion atmosphere and reduce energy consumption.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A large-tonnage ultra-white rolled glass melting furnace, comprising a melting section (1), with small furnaces arranged on both sides of the melting section (1) to heat the melting section (1), used for producing ultra-white rolled glass in glass melting furnaces with a tonnage of 1,000 tons or more, characterized in that: A side-firing small furnace (12) and a bottom-firing small furnace (13) are arranged on both sides of the melting section (1), and the side-firing small furnace (12) and the bottom-firing small furnace (13) are arranged in groups and are used to adjust the combustion atmosphere in the kiln to obtain a reducing atmosphere or an oxidizing atmosphere; Along the material supply direction of the melting section (1), a bottom-burning small furnace (13) and a side-burning small furnace (12) are arranged in sequence, the bottom-burning small furnace (13) is arranged in front of the hot spot (2) of the melting section (1), and uses liquid fuel; The side-burning small furnace (12) is arranged behind the hot spot (2) of the melting section (1) and uses gas fuel; A side-burning spray gun (3) is arranged on the side wall of the side-burning small furnace (12), a furnace bottom spare gun insertion slot (5) is arranged at the bottom of the side-burning small furnace (12), and a bottom-burning spray gun (4) is arranged at the bottom of the bottom-burning small furnace (13); The two sides of the melting section (1) are divided into a high load section and a low load section, wherein the high load section refers to a section where the heat load is greater than the average load value, and the low load section refers to a section where the heat load is less than the average load value; The bottom-fired small furnace (13) is arranged in the high-load section, and the side-fired small furnace (12) is arranged in the low-load section.

2. A large-tonnage ultra-white rolled glass melting furnace as claimed in claim 1, characterized in that: The breast wall heights of the side-firing small furnace (12) and the bottom-firing small furnace (13) are the same.

3. A method for arranging a large-tonnage ultra-white rolled glass melting furnace, used for arranging a large-tonnage ultra-white rolled glass melting furnace according to any one of claims 1-2, characterized in that: According to the tonnage and heat load requirements of the glass melting furnace, a bottom-fired small furnace (13) and a side-fired small furnace (12) are arranged on both sides of the melting section (1) along the material incoming direction of the melting section (1), the bottom-fired small furnace (13) is arranged in front of the hot spot (2) of the melting section (1), and the side-fired small furnace (12) is arranged behind the hot spot (2) of the melting section (1).

4. The method for laying out a large-tonnage ultra-white rolled glass melting furnace according to claim 3, characterized in that: One bottom-burning small furnace (13) is removed, and the spacings of the remaining bottom-burning small furnaces (13) are evenly distributed, and the widths of the bottom-burning craters of the remaining bottom-burning small furnaces (13) are increased.

5. The method for laying out a large-tonnage ultra-white rolled glass melting furnace according to claim 3, characterized in that: A bottom-fired small furnace (13) is arranged at a high load location, and each bottom-fired small furnace (13) is provided with 3-4 spray guns; a side-fired small furnace (12) is arranged at a low load location, and each side-fired small furnace (12) is provided with 2 spray guns.

6. The method for laying out a large-tonnage ultra-white rolled glass melting furnace according to claim 3, characterized in that: Along the material supply direction of the melting section (1), the bottom-firing small furnace (13) and the side-firing small furnace (12) are sequentially arranged on both sides of the melting section (1).

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