Combined body structure of float glass kiln and natural gas hydrogen production conversion tube

Abstract

The utility model discloses a combined body structure of a float glass kiln and a natural gas hydrogen production conversion pipe, which comprises a melting furnace melting part and a melting furnace cooling part, heat storage chambers are arranged on two sides of the melting furnace melting part, and a heat exchange structure is arranged on one side of the melting furnace melting part. The device can replace a cooling fan, reduces power consumption for production, guarantees the stability of a production process, and improves the hydrogen production efficiency of natural gas.

Description

Technical Field

[0001] This utility model belongs to the field of glass furnaces. Specifically, this utility model relates to a combined structure of a float glass furnace and a natural gas hydrogen conversion pipe. Background Technology

[0002] In the float glass production process, the batch material is melted, clarified, and cooled (at a relatively high temperature) before entering the tin bath for shaping, and then cooled in an annealing furnace (at a relatively low temperature). In actual production, the batch material, after being fully heated and melted in the melting section of the furnace, forms molten glass, which circulates multiple times within the furnace. A portion of this molten glass passes through a choke point to reach the cooling section for further cooling.

[0003] In glass furnaces, the common cooling method in the cooling section is to use cooling fans to blow cooled air through cooling ducts directly above the molten glass, carrying away the heat from the molten glass and achieving the cooling purpose. Different types of glass typically have different temperature requirements for the molten glass entering the cooling section. In the cooling section of the melting furnace, uneven cooling by the cooling fans can cause the upper, middle, and lower layers of molten glass to cool too quickly when the cooling air reaches the top layer. This results in the upper layer of molten glass cooling down, increasing its density, and settling, while the middle layer of molten glass remains warmer than the upper layer, creating hot runners that disrupt the normal production process.

[0004] Glass melting furnaces traditionally use fossil fuels such as natural gas, heavy oil, and coal tar. Natural gas-to-hydrogen equipment can produce hydrogen that can be mixed with natural gas to form a blended fuel, thereby reducing dependence on traditional fossil fuels and significantly lowering carbon emissions while improving the combustion efficiency of natural gas. In current natural gas-to-hydrogen equipment, the reforming and cracking of natural gas with steam requires external heat to accelerate the reaction. In actual production, the heat provided by the external natural gas combustion first provides catalytic energy to the mixture of natural gas and steam. After the main reaction, the flue gas from the combustion of natural gas gradually enters the preheating section to preheat the boiler feedwater, combustion gas, and the mixture of natural gas and steam. After passing through the preheating section, the flue gas is finally discharged into the atmosphere through a chimney, with the temperature often maintained at around 180–280°C. This results in energy waste and a large amount of natural gas required for combustion and heating.

[0005] Utility model patent CN207944012U, published on October 9, 2018, discloses a cooling air duct system for the melting section of a glass melting furnace. The system includes a main cooling air pipe, a first cooling air branch pipe for directing cooling air to the front wall, and a second cooling air branch pipe for directing cooling air to the arch beam. Both the first and second cooling air branch pipes are connected to the main cooling air pipe. However, this cooling air duct system for the melting section of a glass melting furnace does not solve the aforementioned technical problem. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a combined structure of a float glass furnace and a natural gas hydrogen conversion pipe that can replace the use of cooling fans, reduce production power consumption, ensure stable production processes, and improve the efficiency of natural gas hydrogen production.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] The combined structure of the float glass furnace and the natural gas hydrogen conversion pipe includes a melting section and a cooling section. The melting section has heat storage chambers on both sides and a heat exchange structure on one side.

[0009] The heat exchange structure includes a main gas mixing pipe and a cooling coil, with both ends of the cooling coil connected to the main gas mixing pipe.

[0010] The furnace cooling section includes a cooling section breast wall, the cooling coil is located inside the furnace cooling section, both ends of the cooling coil penetrate the cooling section breast wall, and the main mixing gas pipeline is located on both sides of the furnace cooling section.

[0011] A transverse passage is connected between the melting section and the cooling section of the furnace. There are two cooling sections, which are arranged side by side and connected to both ends of the transverse passage. The transverse passage includes a breast wall. The cooling coil is located inside the transverse passage and its two ends penetrate the breast wall. The main gas mixing pipe is located on both sides of the transverse passage.

[0012] The melting section of the furnace is provided with a feeding port at one end, and oxygen lances are provided on both sides of the feeding port.

[0013] The main gas mixing pipeline is equipped with control valves at both ends.

[0014] The cooling coils are arranged at equal intervals.

[0015] The technical advantages of this invention are as follows: By adopting the combined structure of the float glass furnace and the natural gas hydrogen production conversion pipe of this invention, while keeping the traditional float glass furnace production process and the basic natural gas hydrogen production process unchanged, the natural gas hydrogen production conversion pipe is used as the cooling pipe for the molten glass. The use of a disc-shaped pipe structure and its reasonable arrangement optimizes the cooling structure in the cooling section of the float glass furnace. It makes full use of the temperature difference in the furnace cooling section to provide the temperature difference required for hydrogen production cracking, solving the problem caused by traditional fan cooling that can only cool the upper layer of molten glass. This is beneficial for controlling the overall temperature of the molten glass and also provides a heat source for the natural gas and steam reforming cracking hydrogen production process, which helps to ensure the stability of the hydrogen production process and improve the hydrogen production efficiency. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 This is a schematic diagram of the overall structure of the kiln-line cooling section of this utility model;

[0018] Figure 2 This is a schematic diagram of the integrated kiln structure of this utility model, which features a multi-line kiln.

[0019] Figure 3 yes Figure 1 A magnified view of a portion of the image;

[0020] Figure 4 This is a flowchart illustrating the overall structure and process flow of the float furnace and natural gas-to-hydrogen production of this utility model.

[0021] The following are marked in the diagram: 1. Melting section of the furnace; 2. Cooling section of the furnace; 3. Regenerator; 4. Horizontal passage of the furnace; 5. Cooling coil; 6. Main mixing gas pipeline; 7. Control valve; 8. Breast wall of the cooling section; 9. Breast wall of the horizontal passage; 10. Feed port; 11. Oxygen lance; 12. Small furnace; 13. Neck; 14. Flow channel; 15. Tin bath; 16. Boiler feedwater preheater; 17. Waste heat boiler; 18. PSA adsorption section; 19. Hydrogen storage tank; 20. L-shaped hanging wall; 21. Pipeline reversing gate; 22. Breast wall of the furnace. Figure 4 Solid line arrow: Direction of gas pipeline; Figure 4 The dashed arrow in the middle indicates the direction of boiler water supply. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of this invention, and to facilitate its implementation.

[0023] like Figure 1 As shown, the combined structure of the float glass furnace and the natural gas hydrogen conversion pipe includes a melting furnace section 1 and a cooling furnace section 2. Heat storage chambers 3 are provided on both sides of the melting furnace section 1, and a heat exchange structure is provided on one side of the melting furnace section 1.

[0024] The heat storage chamber 3 is connected to the melting section 1 of the furnace and is equipped with a small furnace 12, which is used to store part of the heat of the flue gas discharged from the furnace to heat the air entering the furnace. The waste heat of the flue gas is used to heat and assist combustion, accelerate combustion, increase combustion temperature and save fuel.

[0025] like Figure 1 and Figure 2As shown, the heat exchange structure includes a main gas mixing pipe 6 and a cooling coil 5, with both ends of the cooling coil 5 connected to the main gas mixing pipe 6. Using a coil as the heat exchange unit, the spiral coil structure allows the cooling pipe to be extended within the limited space of the cooling section, thereby increasing the contact area with the molten glass, enabling the transfer of more heat, improving heat exchange efficiency, and thus enhancing the efficiency of natural gas-to-hydrogen production. Two main gas mixing pipes 6 are arranged in parallel, serving as the gas inlet and outlet pipes for the mixed gas, respectively.

[0026] like Figure 1 As shown, the furnace cooling section 2 includes a cooling section breast wall 8, cooling coils 5 are installed inside the furnace cooling section 2, and both ends of the cooling coils 5 penetrate the cooling section breast wall 8. A main mixing gas pipe 6 is located on both sides of the furnace cooling section 2. One furnace, one line: The cooling coils 5 are laid horizontally (relative to the drawing direction) in the cooling section of the float glass furnace, eliminating the need for a dilution fan in the cooling section. The temperature of the molten glass in the cooling section is controlled by controlling the flow rate of the mixing gas in the conversion pipe, avoiding direct contact between the dilution air and the molten glass, which would otherwise cause a localized drop in the molten glass temperature.

[0027] like Figure 2 As shown, a transverse passage 4 connects the melting section 1 and the cooling section 2 of the furnace. There are two cooling sections 2, arranged side-by-side and connected to both ends of the transverse passage 4. The transverse passage 4 includes a transverse passage breast wall 9, cooling coils 5 are located within the transverse passage 4, and both ends of the cooling coils 5 penetrate the transverse passage breast wall 9. A mixed gas main pipe 6 is located on both sides of the transverse passage 4. One furnace, multiple lines: Typically, one furnace, two lines are suitable for production lines with relatively large drawing volumes. The properties of the glass produced by these furnaces also differ, making them suitable for automotive glass, architectural glass, electronic glass, etc. Distributing the cooling coils 5 horizontally parallel within the transverse passage 4 (relative to the drawing direction) allows for longitudinal parallel control of the glass melt temperature and flow rate in the drawing direction. This improves the freshness of the glass melt flow, and the higher density of the natural gas-to-hydrogen conversion pipes allows for complete control of the glass melt temperature. In the aforementioned one furnace, multiple lines float glass production line can replace the construction of the cooling section of the float glass production line, reducing the production line's investment cost.

[0028] like Figure 1 and Figure 2 As shown, a feeding port 10 is provided at one end of the melting section 1 of the furnace, and oxygen lances 11 are provided on both sides of the feeding port 10. The oxygen lances 11 are connected to the end of the main gas pipeline 6 for the gas to be discharged. The oxygen lances provide calorific value through the combustion of the gas mixture, thereby preheating the batch material in the feeding area of ​​the melting section 1 of the furnace, realizing full utilization of energy and improving production efficiency.

[0029] like Figure 1 and Figure 2As shown, control valves 7 are installed at both ends of the main gas-mixing pipeline 6. The main gas-mixing pipeline 6 is divided into two paths at both ends. The connection end of the main gas-mixing pipeline 6 and the cooling coil 5 is located between the two control valves 7, which allows the on / off state of the two paths to be controlled at the beginning of the two paths.

[0030] like Figure 1 and Figure 2 As shown, the cooling coils 5 are arranged at equal intervals. The use of multiple cooling coils 5 further increases the heat exchange area and efficiency, which is beneficial for controlling the overall temperature of the molten glass.

[0031] In existing natural gas-to-hydrogen processes, the combustion and preheating sections suffer from reduced heat exchange efficiency due to dust accumulation caused by prolonged flue gas flow, resulting in overall lower hydrogen production efficiency. After conversion, the mixed gas undergoes purification in the PSA adsorption section 18, adsorbing other gases besides hydrogen. However, this process doesn't fully utilize energy, and the adsorbed gas is often returned to the reformer for combustion and heating. Because the adsorption section involves pressure increases, stabilization, and decreases, the supply pressure of the adsorbed gas fluctuates, causing temperature fluctuations within the reformer. Prolonged fluctuations can lead to catalyst pulverization in the upper layer of the hydrogen conversion tube, increasing the pressure difference across the entire tube and reducing conversion efficiency. This results in pulverized catalyst throughout the natural gas-to-hydrogen pipeline, and equipment with long operating times often experiences problems such as pinholes and leaks.

[0032] The structure adopts a combined structure of a float glass furnace and a natural gas hydrogen conversion pipeline, such as... Figure 4 As shown, during production, the flow rate of the mixed gas (natural gas + steam) is first controlled based on the cooling rate of the furnace cooling section 2. Multiple cooling coils 5 within the furnace cooling section 2 are connected at their ends to the mixed gas pipeline. Heat exchange occurs between the molten glass and the cooling coils 5 (i.e., the hydrogen conversion tubes), replacing the method of using desorbed gas to heat the hydrogen conversion process. Therefore, the accumulation of smoke and dust that leads to a decrease in heat exchange efficiency is avoided, and the adverse effects of unstable desorbed gas supply pressure on the production process and equipment are also prevented. After the heat exchange described above, the mixed gas pipeline is designed with two paths. One path leads to the boiler feedwater preheater 16 and waste heat boiler 17 to provide heat energy to the steam production unit and reduce the temperature of the mixed gas. It then enters the PSA unit for adsorption and is sent to the float glass tin bath 15. The adsorption-generated desorbed gas (methane, carbon monoxide, etc.) returns to the mixed gas pipeline leading to the melting furnace for combustion and heating. The other path leads to the oxygen lance 11 in the float glass melting furnace for combustion, which preheats the batch material. The heat provided by the initial combustion of the mixed gas exceeds the heat generated by the oxygen lance 11 using natural gas. This reduces the heat absorption area of ​​the blanket material zone, thereby increasing the melting area in the float glass melting furnace, increasing the drawing capacity of the melting furnace of the same size, and reducing the investment cost of the production line infrastructure.

[0033] By using a natural gas conversion pipe to absorb heat from the cooling section instead of the traditional natural gas-to-hydrogen process, the amount of natural gas required for combustion heating is reduced, and the dilution air fan in the cooling section is replaced, thus reducing electricity consumption in production. Simultaneously, a large amount of mixed gas (hydrogen, methane, carbon monoxide, etc.) can replace the original natural gas, providing fuel gas with higher calorific value. In float glass production, the use of a high-calorific-value heat source reduces the area of ​​the blanket material zone and increases the melting area of ​​the melting furnace. This allows for increased traction capacity of the float glass melting furnace without increasing initial investment in the production line infrastructure. Furthermore, the hydrogen content in the mixed gas exceeds 75%, increasing the proportion of clean energy in production and reducing daily ammonia and lime consumption in the desulfurization and denitrification environmental protection sections, without generating other energy consumption. This fully realizes the recovery and control of heat from the float glass melting furnace.

[0034] This combined structure of a float glass furnace and a natural gas hydrogen production conversion pipe, without changing the traditional float glass furnace production process and the basic natural gas hydrogen production process, uses the natural gas hydrogen production conversion pipe as a cooling pipe for the molten glass. It optimizes the cooling structure of the float glass furnace cooling section 2 by using a disc-shaped pipe structure and its rational placement. This fully utilizes the temperature difference in the furnace cooling section to provide the temperature difference required for hydrogen production cracking, solving the problem caused by traditional fan cooling only cooling the upper layer of molten glass. This facilitates the control of the overall temperature of the molten glass and also provides a heat source for the natural gas and steam reforming and cracking hydrogen production process, which helps ensure the stability of the hydrogen production process and improve hydrogen production efficiency.

[0035] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A combined structure of a float glass furnace and a natural gas hydrogen conversion pipe, characterized in that: It includes a melting section (1) and a cooling section (2) of a melting furnace. The melting section (1) is provided with heat storage chambers (3) on both sides and a heat exchange structure on one side of the melting section (1).

2. The combined structure of the float glass furnace and the natural gas hydrogen conversion pipe according to claim 1, characterized in that: The heat exchange structure includes a mixed gas main pipe (6) and a cooling coil (5), with both ends of the cooling coil (5) connected to the mixed gas main pipe (6).

3. The combined structure of the float glass furnace and the natural gas hydrogen conversion pipe according to claim 2, characterized in that: The furnace cooling section (2) includes a cooling section breast wall (8), the cooling coil (5) is located inside the furnace cooling section (2), the two ends of the cooling coil (5) penetrate the cooling section breast wall (8), and the mixed gas main pipe (6) is located on both sides of the furnace cooling section (2).

4. The combined structure of the float glass furnace and the natural gas hydrogen conversion pipe according to claim 2, characterized in that: A transverse passage (4) connects the melting section (1) and the cooling section (2) of the furnace. There are two cooling sections (2), which are arranged side by side and connected to both ends of the transverse passage (4). The transverse passage (4) includes a transverse passage breast wall (9). The cooling coil (5) is located in the transverse passage (4). Both ends of the cooling coil (5) penetrate the transverse passage breast wall (9). The main gas mixing pipe (6) is located on both sides of the transverse passage (4).

5. The combined structure of the float glass furnace and the natural gas hydrogen conversion pipe according to claim 3 or 4, characterized in that: The melting section (1) of the furnace is provided with a feeding port (10) at one end, and oxygen lances (11) are provided on both sides of the feeding port (10).

6. The combined structure of the float glass furnace and the natural gas hydrogen conversion pipe according to claim 5, characterized in that: The main gas mixing pipeline (6) is equipped with control valves (7) at both ends.

7. The combined structure of the float glass furnace and the natural gas hydrogen conversion pipe according to claim 6, characterized in that: The cooling coils (5) are arranged at equal intervals.

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