Heat preservation and cooling structure and method for molten glass circulation channel

Abstract

The invention discloses a heat preservation and cooling structure and method for a molten glass circulation channel, and particularly relates to the technical field of molten glass production. A pipeline is pre-buried in a third heat preservation layer of a heat preservation layer, all or part of the pipeline is combined and connected, and the flow rate of cooled gas or liquid introduced into the pipeline is adjusted; the heat conductivity coefficient of heat preservation of the third heat preservation layer can be indirectly changed, so that the temperature of molten glass in the channel under different flows can be adjusted, and the heating and cooling efficiency of the channel is improved; and meanwhile, when material leakage occurs in the later operation period of the channel, rapid cooling of the material leakage area can be achieved by introducing cooled gas or liquid into the pipeline in the material leakage area, so that the situation that the material leakage is further expanded to continuously erode the thermal insulation material is prevented, the later operation safety of the channel is guaranteed, and the service life of the channel is further prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of glass liquid production, and in particular relates to a heat preservation and cooling structure and method for a glass liquid circulation channel. Background Art

[0002] In the field of glass production, channels, as the core equipment for the transportation and circulation of glass liquid, play a vital role in product quality. Channels generally include precious metal channels and refractory materials wrapped around the periphery. Their main function is to keep the glass liquid warm during the glass production process and ensure that the glass liquid is cooled evenly and efficiently to meet the production requirements of the subsequent process.

[0003] First of all, the channel needs to be heated before the glass liquid flows through it to ensure that it reaches the temperature required for the circulation of the glass liquid. Currently, the channel is mainly heated by increasing the current of direct heating. This process requires a large increase in current due to the high temperature required. Long-term operation of the channel equipment with high current may affect the stability of the channel equipment in the later operation.

[0004] Secondly, the glass liquid in the channel needs to be cooled evenly. Currently, the channel has problems of insufficient power or insufficient cooling rate under large lead-out volume. Generally, cooling is achieved by increasing the channel, which increases the cost of channel construction.

[0005] Finally, in the later stage of channel equipment operation, there is a risk of leakage in the channel and further erosion of the refractory materials. Currently, a water-cooling plate is added to the outermost layer of the refractory material in the leakage area to reduce the temperature and slow down the further deterioration of the leakage. However, this method will lead to the risk of cracking or even falling off of the insulation bricks on the periphery of the channel. At the same time, the water cooling effect of the leaked glass liquid from the outermost layer is greatly reduced. Summary of the invention

[0006] In view of the technical problem in the prior art that the efficiency of heating and cooling the glass liquid in the circulation channel is slow, the present invention provides a heat preservation and cooling structure and method for the glass liquid circulation channel.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A glass liquid circulation channel insulation and cooling structure, the main feature of which is that the channel structure includes a channel and an insulation layer, the insulation layer is arranged outside the channel, a pipeline is pre-buried in the insulation layer, and pressure reducing valves are installed at the head and tail inlets of the pipeline; when the channel is heated up, the pipeline is filled with gas for insulation, and when the channel is cooled down, the pipeline is filled with cooling fluid.

[0009] The thermal insulation layer comprises a first thermal insulation layer, a second thermal insulation layer, a third thermal insulation layer and a fourth thermal insulation layer, and the first thermal insulation layer, the second thermal insulation layer, the third thermal insulation layer and the fourth thermal insulation layer are tightly fitted in sequence.

[0010] The first insulation layer is a filling layer, the third insulation layer is a sub-outer insulation layer, and the pipes are evenly arranged inside the third insulation layer.

[0011] The pipeline is made of high temperature resistant stainless steel, the diameter of the pipeline is 10 to 30 mm, the thickness of the pipeline is 3 to 8 mm, and the temperature of the third insulation layer is less than or equal to 80% of the highest temperature that the pipeline can withstand.

[0012] A processing method for a glass liquid circulation channel insulation and cooling structure comprises: building a first insulation layer outside the channel, building a second insulation layer outside the first insulation layer, building a third insulation layer outside the second insulation layer, reserving space for a pipeline in the third insulation layer, building a fourth insulation layer outside the third insulation layer, placing the pipeline in the reserved space, and filling the remaining space with slurry.

[0013] For the pipes on the upper and lower sides of the channel, it is necessary to build the third insulation layer of the reserved pipe space after the first insulation layer and the second insulation layer are built. After the pipes are placed in the reserved space, fill the remaining space with slurry and build the fourth insulation layer. For the pipes on both sides of the channel, after the first insulation layer, the second insulation layer and the fourth insulation layer are built, reserve the width of the third insulation layer between the second and fourth insulation layers, place the pipes evenly in the reserved space, and fill the third insulation layer with slurry.

[0014] A method for heat preservation and cooling of a glass liquid circulation channel,

[0015] The method for achieving heat preservation is: introducing gas with low thermal conductivity into the pipeline, opening the pressure reducing valve so that the gas in the pipeline maintains a stable pressure;

[0016] The method for achieving cooling is as follows: a cooling fluid is introduced into the pipeline, and the flow rate of the cooling fluid in the pipeline is adjusted according to the thermal conductivity of the third insulation layer to achieve cooling of the channel.

[0017] When the channel is insulated, the thermal conductivity of the third insulation layer is calculated to ensure that the pipeline achieves the insulation effect. The thermal conductivity calculation method of the third insulation layer is:

[0018]

[0019] Among them, k q1 k is the thermal conductivity of the third insulation layer; 1 k is the thermal conductivity of the insulation material of the third insulation layer; 2 is the thermal conductivity of the gas in the pipeline; V 1 V is the volume occupied by the insulation material of the third insulation layer; 2 is the volume occupied by the gas in the pipeline; α 1 is the calculation coefficient of thermal conductivity when the third insulation layer is insulated; b is the correction coefficient of thermal conductivity of the third insulation layer.

[0020] When the channel achieves efficient cooling, the calculation method of the cooling thermal conductivity of the third insulation layer is:

[0021]

[0022] Where: k q2 k is the cooling thermal conductivity of the third insulation layer; 1 V is the thermal conductivity of the third insulation layer insulation material; 1 V is the volume occupied by the insulation material of the third insulation layer; 2 is the volume occupied by the cooling fluid in the pipe; α 2 is the first calculation coefficient of the thermal conductivity of the third thermal insulation layer when the temperature drops; and β is the second calculation coefficient of the thermal conductivity of the third thermal insulation layer (6) when the temperature drops.

[0023] The thermal conductivity calculation coefficients α and β of the third insulation layer are obtained by constructing a model that is actually consistent or scaled down, performing equivalent calculation of thermal conductivity through actual measurement and using experimental data of heat flux density and temperature gradient, and regressing the data.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention discloses a heat preservation and cooling structure for a glass liquid circulation channel, which realizes rapid heating and cooling of the channel by arranging a heat preservation layer outside the channel and pre-buried pipes inside the heat preservation layer; a pressure reducing valve is used to control the pressure of the cooling fluid in the pipe, so that a constant pressure is maintained in the pipe, thereby ensuring the heat preservation effect during temperature rise and accelerating the temperature rise rate; when the temperature in the channel is reduced, a cooling fluid is introduced, and the temperature drop rate is further accelerated through the circulation of the cooling fluid, thereby effectively improving the temperature rise and drop efficiency of the glass liquid circulating in the channel.

[0026] Furthermore, the close fitting structure of the four insulation layers improves the overall insulation performance, and each insulation layer can be selected with different materials and thicknesses as needed, further optimizing the temperature control efficiency and insulation effect.

[0027] Furthermore, the first insulation layer is used as a filling layer, the third insulation layer is a sub-outer layer and pipes are evenly arranged inside. This design helps to distribute heat more evenly and reduce local overheating or overcooling.

[0028] Furthermore, the pipeline adopts high temperature resistant stainless steel as the pipeline material to ensure long-term stable operation in high temperature environment. The reasonable selection of pipeline size not only ensures sufficient heat exchange area, but also controls the cost and structural complexity.

[0029] Furthermore, the insulation layer is built in layers and space is reserved for pipes, which are then filled with slurry. This method simplifies the construction process, improves the integrity and sealing of the structure, and is conducive to the efficient implementation of on-site construction.

[0030] Furthermore, the pipeline reservation and installation methods at different locations of the channel take into account the convenience and structural strength in actual operation, ensuring the stability and reliability of the pipeline system.

[0031] Furthermore, by accurately calculating and regulating the gas or cooling fluid in the pipeline and dynamically adjusting it according to the thermal conductivity of the third insulation layer, fast and accurate temperature control is achieved, effectively improving the heating and cooling rates of the glass liquid, and these calculation formulas provide a theoretical basis for achieving the optimal temperature control strategy.

[0032] Furthermore, the calculation coefficient of thermal conductivity obtained through actual modeling and experimental data analysis ensures the close integration of theory and practice and improves the scientificity and practicality of the entire system design. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the front view of the heat preservation and cooling structure of the glass liquid circulation channel;

[0034] Figure 2 This is the front view of the heat preservation and cooling structure of the glass liquid circulation channel;

[0035] Figure 3 This is an analysis diagram of the internal pipeline of the glass liquid circulation channel insulation and cooling structure.

[0036] Numbers: 1. channel; 2. insulation layer; 3. pipeline; 4. first insulation layer; 5. second insulation layer; 6. third insulation layer; 7. fourth insulation layer; 8. pressure reducing valve. DETAILED DESCRIPTION

[0037] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0038] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] See also Figure 1 , Figure 2 and Figure 3 , a schematic diagram of the heat preservation and cooling structure of the glass liquid circulation channel, mainly including a channel 1 and an insulation layer 2, the insulation layer 2 includes a first insulation layer 4, a second insulation layer 5, a third insulation layer 6 and a fourth insulation layer 7, the first insulation layer 4, the second insulation layer 5, the third insulation layer 6 and the fourth insulation layer 7 are sequentially arranged on the periphery of the channel 1, and the first insulation layer 4, the second insulation layer 5, the third insulation layer 6 and the fourth insulation layer 7 are closely fitted to each other, a pipeline 3 is pre-buried in the third insulation layer 6, and a pressure reducing valve 8 is installed on the pipeline 3.

[0040] This embodiment provides a glass liquid circulation channel heat preservation and cooling structure and method, aiming to improve the heating and cooling efficiency of the glass liquid in the circulation channel. This embodiment is described with reference to the accompanying drawings as an example, and its specific implementation steps are as follows:

[0041] Channel 1 is supported by high temperature resistant materials, and is used to contain and transport glass liquid. A four-layer insulation structure is installed on the outside of channel 1. The four-layer insulation structure is the first insulation layer 4, the second insulation layer 5, the third insulation layer 6 and the fourth insulation layer 7. The number of insulation layers outside channel 1 of this structure is not limited, but the number of insulation layers should be greater than or equal to 4 layers; the first insulation layer 4 is a filling layer, which can be polyurethane foam. The first insulation layer 4 is arranged between channel 1 and the second insulation layer 5 to ensure that the space between channel 1 and the second insulation layer 5 is tightly filled; the second insulation layer 5 is made of high temperature resistant materials, such as high-resistant asbestos board; the third insulation layer 6 is the secondary outer insulation layer, and a pipe 3 is pre-buried inside it. The pipe 3 is made of High temperature resistant stainless steel material, such as 316L, the diameter of the pipe 3 is 20mm, the thickness of the pipe 3 is 5mm, the pipes 3 are evenly arranged inside the third insulation layer 6, the spacing between the pipes 3 is 20cm, and the two sides of adjacent pipes 3 are fully or partially combined according to the insulation or cooling requirements; the temperature of the third insulation layer 6 must be less than or equal to 80% of the maximum temperature that the material selected for the pipe 3 can withstand, so as to ensure that the pipe 3 can operate stably for a long time at high temperature; a pressure reducing valve 8 is installed at the first connection of the adjacent pipes 3, and the pressure reducing valve 8 is used to stabilize the fluid pressure in the pipe 3 at about 0.5MPa.

[0042] There are two types of installation of pipe 3 in the third insulation layer: when installing pipe 3 on both sides of the channel, it is necessary to first build the channel 1, the first insulation layer 4 and the second insulation layer 5, and place the pipe 3 evenly in the reserved space in turn, then fill the remaining space of the third insulation layer 6 with slurry, and finally build the fourth insulation layer 7; when installing pipe 3 on the upper and lower sides of the channel, after building the first insulation layer 4, the second insulation layer 5, the fourth insulation layer 7 and the third insulation layer 6 with space reserved for pipe 3, place the pipe 3 in the reserved space of the third insulation layer 6 in turn, and fill the remaining space with slurry.

[0043] When the glass liquid needs to be kept warm while circulating in the channel 1, a gas with low thermal conductivity, such as argon, helium, nitrogen and other low thermal conductivity and safe gases, is injected into the pipe 3 in the third insulation layer 6. In this embodiment, helium is used, and the thermal conductivity of helium is 0.15W / (m·K), which is much lower than that of air and has high safety. At the same time, the pressure reducing valve 8 is opened. When the helium passes through the pressure reducing valve 8, the input pressure fluctuates. The pressure reducing valve 8 automatically adjusts the valve opening according to the pressure fluctuation to ensure that the pressure output to the connecting pipe remains constant, so as to accelerate the heating efficiency of the glass liquid in the channel 1. During the heating process of the channel 1, it is necessary to further ensure that the pipe 3 has achieved the insulation effect. Therefore, it is necessary to judge by the thermal conductivity of the third insulation layer 6. The thermal conductivity changes according to the heating demand. The higher the thermal conductivity, the worse the insulation effect, and vice versa. Therefore, during the heating process, the staff sets a standard value k of the thermal conductivity according to the heating demand. 1 , the calculated thermal conductivity k of the third insulation layer 6 q1 Should be close to the standard value of thermal conductivity k 1 Or less than or equal to the standard value of thermal conductivity k 1 When the glass liquid is heated in the channel 1, the thermal conductivity of the third insulation layer 6 is calculated as follows:

[0044]

[0045] Among them, k q1 k is the thermal conductivity of the second outer insulation layer, in W / (m·K); 1 k is the thermal conductivity of the original insulation material of the second outer layer, in W / (m·K); 2 is the thermal conductivity of the gas in the second outer layer of the pipeline, in W / (m·K); V 1 The volume occupied by the original insulation material of the second outer layer, in mm 3 ; V 2 The volume of gas in the third insulation layer 6 pipeline, unit: mm 3 ; α is the thermal conductivity calculation coefficient of the third thermal insulation layer 6; b is the thermal conductivity correction coefficient of the third thermal insulation layer 6.

[0046] When the glass liquid needs to be cooled while circulating in the channel 1, in order to speed up the cooling efficiency, a cooling circulation system is used to connect with the pipe 3 in the third insulation layer 6, and a cooling fluid is introduced into the pipe 3 by the cooling circulation system. The cooling fluid may be cooling water or cooling gas. In this embodiment, cooling water is used as the cooling fluid. The cooling water passes through the pipe 3 and the cooling circulation system, so that the cooling water can continuously cool the pipe 3.

[0047] During the cooling process, the staff set the corresponding standard value k of the cooling thermal conductivity of the third insulation layer 6 according to the cooling requirements of the glass liquid. 2, the calculated thermal conductivity k of the third insulation layer 6 q2 The higher the value, the faster the cooling water flow rate in the pipe 3, the better the cooling effect, and vice versa. Therefore, in the cooling process of the glass liquid, the cooling thermal conductivity k of the third insulation layer 6 is calculated. q2 Should be close to or greater than the standard value of the cooling thermal conductivity k 2 , when the cooling thermal conductivity k q2 Much smaller than the standard value k of the cooling thermal conductivity 2 When cooling, the staff accelerates the flow rate of cooling water in pipe 3 through the cooling water circulation system to speed up the cooling efficiency of the glass liquid. When cooling, the cooling thermal conductivity of the third insulation layer is calculated as follows:

[0048]

[0049] Where: k q2 k is the cooling thermal conductivity of the third insulation layer, in W / (m·K); 1 is the thermal conductivity of the third insulation layer insulation material, unit W / (m·K); V 1 The volume occupied by the insulation material of the third insulation layer, in mm 3 ; V 2 is the volume occupied by the cooling fluid in the pipe, in mm3; α 2 is the first calculation coefficient of the thermal conductivity of the third thermal insulation layer 6 when the temperature drops; β is the second calculation coefficient of the thermal conductivity of the third thermal insulation layer 6 when the temperature drops.

[0050] The calculation coefficients α and β of the thermal conductivity of the third insulation layer 6 are calculated by constructing a model that is actually consistent or reduced in proportion, and by actually measuring the heat flow under certain working conditions (given the conditions inside and outside the insulation material, given the flow rate conditions in the pipeline, etc.), and using experimental data such as heat flux density and temperature gradient to perform equivalent calculation of thermal conductivity and obtain the coefficients based on data regression; the specific calculation is that during operation, an experiment is first performed through the Ajian proportional model to measure the environmental data during the working process (such as the temperature difference between the inside and outside of the channel 1, the type of introduced fluid, and the flow rate of the fluid, etc.), obtain the heat flux density and temperature gradient data, and use the heat conduction theory to calculate the α and β coefficients, so as to use the above formula to calculate the temperature rise k q1 and cooling k q2 The value of k q1 and cooling k q2 The value is used to guide the temperature control during actual operation, thereby improving the efficiency of temperature change.

[0051] It should be understood that although this specification is described in accordance with the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A heat preservation and cooling structure for a glass liquid circulation channel, the main feature of which is that the channel structure comprises a channel (1) and a heat preservation layer (2), the heat preservation layer (2) is arranged outside the channel (1), a pipeline (3) is pre-buried in the heat preservation layer (2), and pressure reducing valves (8) are installed at the inlet and outlet of the pipeline (3); when the temperature of the channel (1) rises, the pipeline (3) is filled with gas for heat preservation, and when the temperature of the channel (1) drops, the pipeline (3) is filled with cooling fluid.

2. A heat preservation and cooling structure for a glass liquid circulation channel according to claim 1, characterized in that: The thermal insulation layer (2) comprises a first thermal insulation layer (4), a second thermal insulation layer (5), a third thermal insulation layer (6) and a fourth thermal insulation layer (7), and the first thermal insulation layer (4), the second thermal insulation layer (5), the third thermal insulation layer (6) and the fourth thermal insulation layer (7) are tightly fitted in sequence.

3. A heat preservation and cooling structure for a glass liquid circulation channel according to claim 2, characterized in that: The first thermal insulation layer (4) is a filling layer, the third thermal insulation layer (6) is a secondary outer thermal insulation layer, and the pipes (3) are evenly arranged inside the third thermal insulation layer (6).

4. The heat preservation and cooling structure for a glass liquid circulation channel according to claim 3, characterized in that: The pipeline (3) is made of high temperature resistant stainless steel, the diameter of the pipeline (3) is 10-30 mm, the thickness of the pipeline (3) is 3-8 mm, and the temperature of the third insulation layer (6) is less than or equal to 80% of the maximum temperature borne by the pipeline (3).

5. A method for processing a heat preservation and cooling structure of a glass liquid circulation channel, characterized in that: A highly efficient heating and cooling structure for a glass liquid circulation channel according to any one of claims 1 to 4 is provided, wherein a first insulation layer (4) is built outside the channel (1), a second insulation layer (5) is built outside the first insulation layer (4), a third insulation layer (6) is built outside the second insulation layer (5), space for a pipe (3) is reserved in the third insulation layer (6), a fourth insulation layer (7) is built outside the third insulation layer (6), the pipe (3) is placed in the reserved space, and the remaining space is filled with slurry.

6. A method for processing a heat preservation and cooling structure for a glass liquid flow channel according to claim 5, characterized in that: For the pipes (3) on the upper and lower sides of the channel (1), after the first insulation layer (4) and the second insulation layer (5) are built, a third insulation layer (6) is built to reserve space for the pipes (3), and after the pipes (3) are placed in the reserved space, the remaining space is filled with slurry and a fourth insulation layer (7) is built; for the pipes (3) on both sides of the channel (1), after the first insulation layer (4), the second insulation layer (5) and the fourth insulation layer (7) are built, a width of the third insulation layer (6) is reserved between the second insulation layer (5) and the fourth insulation layer (7), the pipes (3) are evenly placed in the reserved space, and the third insulation layer (6) is filled with slurry.

7. A method for heat preservation and cooling of a glass liquid circulation channel, characterized in that: A glass liquid circulation channel structure according to any one of claims 1 to 4, The method for achieving heat preservation is: introducing gas with low thermal conductivity into the pipeline (3), opening the pressure reducing valve (8) so that the gas in the pipeline (3) maintains a stable pressure; The method for achieving cooling is as follows: a cooling fluid is introduced into the pipe (3), and the flow rate of the cooling fluid in the pipe (3) is adjusted according to the thermal conductivity of the third thermal insulation layer to achieve cooling of the channel (1).

8. A method for heat preservation and cooling of a glass liquid circulation channel according to claim 7, characterized in that: When the channel (1) is insulated, the heat conductivity of the third insulation layer (6) is calculated to ensure that the pipeline achieves the insulation effect. The heat conductivity of the third insulation layer (6) is calculated as follows: Among them, k q1 is the thermal conductivity of the third thermal insulation layer (6) when the temperature is increased; k1 is the thermal conductivity of the thermal insulation material of the third thermal insulation layer (6); k2 is the thermal conductivity of the gas in the pipeline (3); V1 is the volume occupied by the thermal insulation material of the third thermal insulation layer (6); V2 is the volume occupied by the gas in the pipeline (3); α1 is the calculation coefficient of the thermal conductivity when the third thermal insulation layer (6) is insulated; and b is the thermal conductivity correction coefficient of the third thermal insulation layer (6) when insulated.

9. A method for heat preservation and cooling of a glass liquid circulation channel according to claim 8, characterized in that: When the channel (1) achieves efficient cooling, the cooling thermal conductivity calculation method of the third thermal insulation layer (7) is: Where: k q2 is the cooling thermal conductivity of the third thermal insulation layer (6); k1 is the thermal conductivity of the thermal insulation material of the third thermal insulation layer (6); V1 is the volume occupied by the thermal insulation material of the third thermal insulation layer (6); V2 is the volume occupied by the cooling fluid in the pipeline (3); α2 is the first calculation coefficient of the thermal conductivity of the third thermal insulation layer (6) when the third thermal insulation layer (6) is cooled; β is the second calculation coefficient of the thermal conductivity of the third thermal insulation layer (6) when the temperature is cooled.

10. A method for heat preservation and cooling of a glass liquid circulation channel according to claim 9, characterized in that: The thermal conductivity calculation coefficients α and β of the third thermal insulation layer (6) are obtained by constructing a model that is consistent with the actual or reduced-scale model, performing equivalent calculation of thermal conductivity through actual measurement and using experimental data of heat flux density and temperature gradient, and regressing the data.

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