METHOD FOR HEATING LIQUID GLASS CHANNEL OF GLASS FIBER TANK FURNACE

Abstract

A method for heating a liquid glass channel of a glass fiber tank furnace. The method comprises: passing oxygen gas and a fuel, via a burner (1), into a channel space (3) for combustion to heat the channel space (3) and a liquid glass (2), wherein the flow rate of the fuel is V.sub.F and the flow rate of the oxygen gas is V.sub.OX such that the relative velocity difference D=(V.sub.FV.sub.OX)V.sub.F. The temperature of the channel is 0-1500 C., and the relative velocity difference D is kept to 25% or more. A pure oxygen combustion method is used for heating a tank furnace channel to reduce waste gas emission and heat loss, thereby achieving the goals of energy conservation, reduced carbon emissions, and improve environment friendliness. The fuel flow rate, relative velocity difference, and related parameters can be controlled according to the temperature of the channel, providing excellent uniformity and accurate control of the temperature of the channel.

Claims

1. A method for heating a liquid glass channel of a glass fiber tank furnace, wherein, comprising: passing oxygen and fuel, via a burner (1), into a channel space (3) for combustion to heat the channel space (3) and liquid glass (2); wherein a flow rate of the fuel is V.sub.F, a flow rate of the oxygen is V.sub.OX, a relative velocity difference is D=(V.sub.FV.sub.OX)/V.sub.F, a temperature of the channel is 0-1500 C., and the relative velocity difference expressed as D is greater than 25%.

2. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein a range of the flow rate of the fuel expressed as V.sub.F is 0-100 m/s, and a range of the flow rate of the oxygen expressed as V.sub.OX is 0-1 m/s.

3. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein, when the channel temperature is controlled to be greater than 0 C. and less than or equal to 500 C., a range of the relative velocity difference expressed as D is controlled to be greater than 25% and less than or equal to 50%.

4. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein, when the channel temperature is controlled to be greater than 500 C. and less than or equal to 1000 C., a range of the relative velocity difference expressed as D is controlled to be greater than 50% and less than or equal to 90%.

5. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein, when the channel temperature is controlled to be greater than 1000 C. and less than or equal to 1500 C., a range of the relative velocity difference expressed as D is controlled to be greater than 90%.

6. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein, when the channel temperature is controlled to be greater than 0 C. and less than or equal to 500 C., a range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 0 m/s and less than or equal to 15 m/s.

7. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein, when the channel temperature is controlled to be greater than 500C. and less than or equal to 1000 C., a range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 1.5 m/s and less than or equal to 50 m/s.

8. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein, when the channel temperature is controlled to be greater than 1000 C. and less than or equal to 1500 C., a range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 50 m/s and less than or equal to 100 m/s.

9. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein, when the channel temperature is greater than 0 C. and less than or equal to 500 C., a range of the relative velocity difference expressed as D is controlled to be greater than 25% and less than or equal to 50%, and a range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 0 m/s and less than or equal to 15 m/s; when the channel temperature is greater than 500 C. and less than or equal to 1000 C., the range of the relative velocity difference expressed as D is controlled to be greater than 50% and less than or equal to 90%, and the range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 15 m/s and less than or equal to 50 m/s; when the channel temperature is greater than 1000 C. and less than or equal to 1500 C., the range of the relative velocity difference expressed as D is controlled to be greater than 90%, and the range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 50 m/s and less than or equal to 100 m/s.

10. The method for heating liquid glass channel of glass fiber tank furnace of claim 1, wherein a range of a flame temperature is 1000-1800 C.

11. The method for heating liquid glass channel of glass fiber tank furnace of claim 3, wherein, when the channel temperature is controlled to be greater than 0 C. and less than or equal to 500 C., a range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 0 m/s and less than or equal to 15 m/s.

12. The method for heating liquid glass channel of glass fiber tank furnace of claim 4, wherein, when the channel temperature is controlled to be greater than 500 C. and less than or equal to 1000 C., a range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 15 m/s and less than or equal to 50 m/s.

13. The method for heating liquid glass channel of glass fiber tank furnace of claim 5, wherein, when the channel temperature is controlled to be greater than 1000 C. and less than or equal to 1500 C., a range of the flow rate of the fuel expressed as V.sub.F is controlled to be greater than 50 m/s and less than or equal to 100 m/s.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings incorporated into the description and constituting part of the description show the embodiments of the present invention, and are used to explain the principle of the present invention together with the description. In these drawings, similar reference numbers are used to denote similar elements. The drawings described below show some but not all of the embodiments of the present invention. For a person of ordinary skill in the art, other drawings can be obtained according to these drawings without paying any creative effort.

[0036] FIG. 1 is a schematic diagram of a liquid glass channel structure according to the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

[0037] In order to better clarify the purposes, technical solutions and advantages of the examples of the present invention, the technical solutions in the examples of the present invention are clearly , and completely described below in combination with the drawings in the examples. Obviously, the examples described herein are just part of the examples of the present invention and are not all the examples. All other exemplary embodiments obtained by one skilled in the art on the basis of the examples in the present invention without performing creative work shall all fall into the scope of protection of the present invention. What needs to be made dear is that, as long as there is no conflict, the examples and the features of examples in the present application can be arbitratily combined with each other.

Embodiment 1

[0038] In actual production, the channel temperature is maintained at 1400 C. for a long time. Then at this temperature, the heating method of the present invention is compared with the traditional air heating method. Referring to FIG. 1, passing the oxygen and the fuel, with a certain velocity, via a burner 1, into a channel space 3 for combustion to heat the channel space 3 and liquid glass 2 in the channel; wherein the flow rate of the fuel is V.sub.F and the flow rate of the oxygen is V.sub.OX, the relative velocity difference is D=(V.sub.FV.sub.OX)/V.sub.F. The amounts of fuel consumed for per kilogram of molten glass by adopting different heating methods are shown in Table 1:

TABLE-US-00001 TABLE 1 Fuel consumption by adopting different heating methods Fuel Flow consumption/ Relative Flow rate (Nm.sup.3/ Channel velocity rate of of the Kilogram temperature/ difference the fuel/ oxygen/ of molten No. C. D (m/s) (m/s) glass) 1 1400 86.1% 65 9 0.018 2 1400 92% 50 4 0.022 3 1400 91% 100 9 0.01 Air 1400 0.09 combustion

[0039] When the channel temperature is maintained at 1400 C., the fuel consumption of air combustion is 0.09 Nm.sup.3/Kilogram of molten glass, the fuel consumption of the combustion method numbered 1-3 in Table 1 are 0.018 Nm.sup.3/Kilogram of molten glass, 0.022 Nm.sup.3/Kilogram of molten glass and 0.01 Nm.sup.3/Kilogram of molten glass, respectively. The combustion method provided in present invention greatly reduces the energy consumption, effectively improves the heat utilization efficiency by controlling the relative velocity of the fuel and the oxygen. Wherein, the combustion method numbered 3 in Table 1 has the lowest energy consumption.

Embodiment 2

[0040] Referring to FIG. 1, passing the oxygen and the fuel, with a certain velocity, via a burner 1, into a channel space 3 for combustion to heat the channel space 3 and the liquid glass 2 in the channel; wherein the flow rate of the fuel is V.sub.F and the flow rate of the oxygen is V.sub.OX such that the relative velocity difference is D=(V.sub.FV.sub.OX)/V.sub.F. Table 2 shows the flow rates of the fuel and the oxygen at different channel temperatures.

TABLE-US-00002 TABLE 2 Channel temperatures and the related combustion parameters Relative Channel velocity Flow rate temperature/ difference Flow rate of of the No. C. D the fuel/(m/s) oxygen/(m/s) 1 300 54.5% 5.5 2.5 2 400 40.6% 16 9.5 3 500 37.5% 4 2.5 4 600 74.3 14 3.6 5 800 91% 40 3.6 6 1000 77.1% 35 8 7 1100 92% 50 4 8 1300 90% 90 9 9 1500 91% 100 9

[0041] The combustion methods numbered 1-9 in Table 2, by controlling the relative velocity of the oxygen and the fuel, enable the temperature of the channel to quickly reach the target temperature, have good uniformity of the temperature, and have the flame temperature as high as 1000-1800 C., have strong radiation capability, effectively improve the heat utilization efficiency, and reduce the heat loss.

[0042] Wherein, the methods numbered 3, 6 and 9 can control the channel temperature more accurately and achieve better uniformity of the channel temperature.

[0043] It can be seen from the above tables that, compared with the prior art, the present invention has the following beneficial effects:

[0044] First, the combustion method provided in the present invention uses fuel and oxygen for combustion, and studies the relative velocity relationship of the fuel and the oxygen, which effectively compensates for various defects in air combustion and improves the flame temperature and heat utilization efficiency.

[0045] Secondly, the present invention adopts grading control for the relative velocity difference expressed as D and the flow rate of the fuel expressed as V.sub.F according to the different channel temperatures, which realizes the accurate control of different channel temperatures.

[0046] Thirdly, the combustion method provided in the present invention enables the temperature of the channel to quickly reach the target temperature, maintains uniformity of the temperature, reduces the energy consumption and cost of production, thereby achieving the goal of energy conservation, emission reduction and environmental protection.

[0047] Finally, what should be made clear is that, in this text, the terms contain, comprise or any other variants are intended to mean nonexclusively include so that any process, method, article or equipment that contains a series of factors shall include not only such factors, but also include other factors that are not explicitly listed, or also include intrinsic factors of such process, method, object or equipment. Without more limitations, factors defined by the phrase contain a . . . or its variants do not rule out that there are other same factors in the process, method, article or equipment which include said factors.

[0048] The above examples are provided only for the purpose of illustrating instead of limiting the technical solutions of the present invention. Although the present invention is described in details by way of aforementioned examples, one skilled in the art shall understand that modifications can also be made to the technical solutions embodied by all the aforementioned examples or equivalent replacement can be made to some of the technical features. However, such modifications or replacements will not cause the resulting technical solutions to substantially deviate from the spirits and ranges of the technical solutions respectively embodied by all the examples of the present invention.

INDUSTRIAL APPLICABILITY OF THE INVENTION

[0049] The present invention adopts oxy-fuel combustion to heat the liquid glass channel of the tank furnace, studies the relative velocity relationship of the fuel and the oxygen. By controlling the relative velocity difference of the fuel and the oxygen expressed as D and the flow rate of the fuel expressed as V.sub.F, it can realize the accurate control of different channel temperatures, enable the temperature of the channel to quickly reach the target temperature, maintain uniformity of the temperature, reduce the energy consumption and cost of production, thereby achieving the goal of energy conservation, emission reduction and environmental protection.