Reloading method for glass production

Abstract

The invention relates to the technical field of glass manufacturing, in particular to a material changing method for glass production. The material changing method comprises the following steps: carrying out first material changing treatment on an initial material in a kiln by adopting a transition material; and when the content difference of the same components between the molten glass in the kiln and the target material is smaller than or equal to a preset threshold value, carrying out second refueling treatment on the molten glass in the kiln after the first refueling treatment by adopting the target material. Wherein the content difference of the same component among the initial material, the transition material and the target material meets the condition that delta1 is equal to delta2 + delta3, delta1 is the content difference of the same component between the transition material and the initial material, delta2 is the content difference of the same component between the target material and the initial material, and delta3 is the content difference of the same component between the transition material and the target material. According to the material changing method, the material changing time is effectively shortened, the yield of the transition glass is reduced, the overall economic benefit is improved, the influence on the service life of the kiln and the back-end process is small, and the equipment loss is small.

Description

Technical Field

[0001] This application belongs to the technical field of glass manufacturing, and particularly relates to a method for changing materials in glass production. Background Art

[0002] With the increasing maturity of the glass production industry, as well as the competition in production processes and production capacities in the glass market, the production of diversified products is crucial for the actual production operation and strategic planning of enterprises. The production of diversified products means that more production lines need to be built, or more types of products with different compositions need to be produced on the same production line. When producing glass products with different compositions on the same production line, it is necessary to replace the glass liquid in the kiln after the production of the previous product is completed, so as to facilitate the production of the latter product.

[0003] Currently, when producing glasses with different compositions in the same kiln, the production of the next glass product can be carried out by emptying the original glass liquid in the kiln and then introducing raw materials of a new formula. This method of changing materials by emptying the glass liquid requires drilling holes to empty all the glass liquid in the original kiln pool. As the glass liquid is discharged, the temperature field in the kiln changes greatly, and the pressure exerted by the glass liquid on the pool wall will change, breaking the original balance. The superimposed effects in many aspects are extremely likely to cause the explosion of the pool wall bricks and the pulling out of the crown bricks. Therefore, although this method of changing materials by emptying the glass liquid has a short material change time, the material change process is uncontrollable, and both the service life of the kiln and the subsequent processes will be greatly affected, and the loss of equipment is also relatively large.

[0004] In addition to changing materials by emptying, it is also possible to directly introduce the raw materials of the replaced formula into the kiln and gradually replace the original glass liquid in the kiln. This method of gradually transitioning the material change process is relatively controllable and has less impact on the kiln, but the material change transition time is relatively long, and the output of the transitional glass generated during the transition period is relatively large, resulting in a certain waste and a relatively large production cost. Since the existing two methods of changing materials, namely changing materials by emptying and gradually transitioning, have deficiencies, it is necessary to provide a new method of changing materials to shorten the material change time, save the input cost, reduce the output of the transitional glass, and improve the overall economic efficiency on the premise of the safety and control of the melting furnace. Summary of the Invention

[0005] The purpose of this application is to provide a method for changing materials in glass production and float glass, so as to solve the technical problems in the prior art that the material change time of the glass production material change method is too long, or the material change process has a greater impact on the service life of the kiln and the subsequent processes.

[0006] To achieve the above application purpose, the technical solution adopted in this application is as follows:

[0007] The embodiment of this application provides a method for changing materials in glass production. The method for changing materials in the embodiment of this application includes the following steps:

[0008] Use transitional material to perform the first material replacement treatment on the initial material in the kiln;

[0009] When the content difference of the same components between the molten glass in the kiln and the target material is less than or equal to the preset threshold, use the target material to perform the second material replacement treatment on the molten glass in the kiln after the first material replacement treatment.

[0010] Among them, the content difference of the same component between the initial material, the transitional material, and the target material satisfies Δ1 = Δ2 + Δ3, where Δ1 is the content difference of the same component between the transitional material and the initial material, Δ2 is the content difference of the same component between the target material and the initial material, and Δ3 is the content difference of the same component between the transitional material and the target material.

[0011] The material replacement method in the embodiments of the present application uses a transitional material with a greater content difference from the initial material for transition, so that the composition of the molten glass in the kiln can approach the formula composition of the target material faster, effectively shortening the material replacement time, reducing the output of transitional glass during material replacement, and improving the overall economic benefits. And because in the material replacement method of the embodiments of the present application, it is not necessary to drain all the molten glass in the kiln and then add the replaced target material, the material replacement method of the embodiments of the present application has little impact on the life of the kiln and the subsequent processes, and little wear on the equipment.

[0012] When preparing the float glass in the embodiments of the present application, the above-mentioned material replacement treatment method is adopted, which effectively improves the production efficiency of the float glass in the embodiments of the present application, reduces the production cost, and makes the float glass more competitive in the market. Detailed implementation manners

[0013] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0014] In the present application, the term "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0015] In this application, "at least one" means one or more, and "a plurality" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can both represent: a, b, c, a~b (i.e., a and b), a~c, b~c, or a~b~c, where a, b, and c can each be single or multiple.

[0016] It should be understood that in various embodiments of this application, the magnitudes of the serial numbers of the above processes do not imply the order of execution. Some or all of the steps can be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application.

[0017] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. The singular forms "a" and "the" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0018] The weights of the relevant components mentioned in the specification of the embodiments of this application can not only refer to the specific contents of each component, but also represent the proportional relationship of the weights between the components. Therefore, as long as the contents of the relevant components in the specification of the embodiments of this application are scaled up or down in proportion, they are within the scope disclosed in the specification of the embodiments of this application. Specifically, the mass in the specification of the embodiments of this application can be mass units well-known in the chemical industry such as μg, mg, g, kg, etc.

[0019] The terms "first" and "second" are only used for descriptive purposes, to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. For example, without departing from the scope of the embodiments of this application, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of such features.

[0020] To solve the technical problems in the prior art that the material change time in the glass production material change method is too long, or the material change process has a greater impact on the life of the kiln and the subsequent processes, the following technical solutions are proposed in this application.

[0021] In a first aspect, an embodiment of this application provides a glass production material change method, including the following steps:

[0022] Step S10: Perform a first material change process on the initial material in the kiln using transitional material;

[0023] Step S20: When the content difference of the same components between the glass produced in the kiln and the target material is less than or equal to a preset threshold, the glass produced in the kiln after the first material replacement is processed with the target material for the second material replacement.

[0024] Among them, the content difference of the same component among the initial material, the transition material, and the target material satisfies Δ1 = Δ2 + Δ3, where Δ1 is the content difference of the same component between the transition material and the initial material, Δ2 is the content difference of the same component between the target material and the initial material, and Δ3 is the content difference of the same component between the transition material and the target material.

[0025] In the material replacement method of this application embodiment, when the transition material replaces the initial material in the replacement kiln, it can homogenize the components of the glass liquid in the kiln, making the content of each component in the glass liquid close to the content of each component in the target material, achieving a large-scale homogenization transformation while replacing, reducing the required equivalent for replacement, and saving the cycle and cost of material replacement. That is, when the material replacement method of this application embodiment uses the transition material to perform the first material replacement on the initial material, the ratio of each component in the glass liquid in the kiln will gradually change from the ratio of the initial material to the ratio of the transition material. Since the content difference of the same component between the transition material and the initial material is greater than or equal to the content difference of this component between the target material and the initial material, in terms of the content of the same component, the content of this component in the initial material, the target material, and the transition material increases or decreases in sequence. This makes the content of this component in the glass liquid in the kiln change from the proportion of the initial material to the proportion of the target material during the first material replacement process. Therefore, compared with directly using the target material to replace the initial material, due to the greater component content difference between the transition material and the initial material, the first material replacement enables the components of the glass liquid in the kiln to approach the ratio of the target material faster, and the composition of the glass liquid in the kiln and the ratio of the target material can satisfy the preset threshold faster, effectively shortening the time of the material replacement process, reducing the output of transitional glass, and improving production efficiency and economic efficiency.

[0026] In addition, since the material replacement method of this application embodiment does not need to drain all the glass liquid in the kiln and then add the replaced target material, therefore, the material replacement method of this application embodiment has less impact on the life of the kiln and the subsequent processes, less equipment wear, a short material replacement cycle, and low material replacement cost.

[0027] It can be understood that transitional glass refers to the glass produced during the process of replacing the glass liquid in the kiln and adjusting parameters after the production of the previous glass and before the production of the next glass when producing two glasses with different components on the same production line. For example, when the same production line needs to produce glass B after the production of glass A, the transitional glass is the glass produced after the production of glass A and before the production of glass B.

[0028] Step S10:

[0029] In step S10, first, a first material replacement treatment is performed on the initial material in the furnace using the transition material, so that the different component contents of the molten glass in the furnace gradually change to the component ratios of the target material.

[0030] It should be noted that in the specification of this application, Δ1, Δ2, and Δ3 are all taken as absolute values. When Δ1 = Δ2 + Δ3, that is, when Δ1 ≥ Δ2 and Δ1 ≥ Δ3 are satisfied.

[0031] In some embodiments, the content difference of the same component among the initial material, the transition material, and the target material can satisfy Δ1 > Δ2 and Δ1 > Δ3. That is, when the initial material, the transition material, and the target material contain the same component, for example, when they all contain component 1, the content difference of component 1 between the initial material and the transition material is greater than the content difference of component 1 between the initial material and the target material. The content of component 1 in the initial material, the target material, and the transition material can increase or decrease in sequence, which is not specifically limited. For example, in a demonstration example, component 1 can be calcium oxide. The content of calcium oxide in the initial material can be 7%, the content of calcium oxide in the target material can be 5%, and the content of calcium oxide in the transition material can be 3%. In another demonstration example, component 1 can be magnesium oxide. The content of magnesium oxide in the initial material can be 2%, the content of magnesium oxide in the target material can be 4%, and the content of magnesium oxide in the transition material can be 8%. In yet another demonstration example, component 1 can be zinc oxide. The content of zinc oxide in the initial material can be 0%, the content of zinc oxide in the target material can be 3%, and the content of zinc oxide in the transition material can be 6%.

[0032] In some embodiments, the content difference of the same component among the initial material, the transition material, and the target material can satisfy Δ1 = Δ2 and / or Δ1 = Δ3. For example, when the initial material contains component 1 while the target material does not contain component 1, the transition material also does not contain component 1. At this time, Δ1 = Δ2. In a demonstration example, component 1 in the initial material is lithium oxide, and the content of lithium oxide is 5%. The content of lithium oxide in the target material is 0%, then the content of lithium oxide in the transition material is also 0%.

[0033] In some embodiments, the material replacement method of the embodiments of this application may include the following steps:

[0034] Step S11: Determine the formula of at least one set of preset transition materials according to at least one preset material replacement cycle and formula (1);

[0035] Step S12: Determine the temperature curve of at least one set of preset transition materials, and determine the formula of the transition material according to the temperature curve of at least one set of preset transition materials and the furnace bearing temperature.

[0036]

[0037] Among them, in formula (1), M is the total amount of molten glass actually carried by the furnace, with the unit of ton;

[0038] T is the preset batch change cycle, with the unit of h;

[0039] Y is the hourly pulling rate of the first batch change treatment, with the unit of ton of molten glass per hour.

[0040] 1, 2, n respectively represent component 1, component 2 and component n, … represents other components not fully enumerated between component 2 and component n. For example, there may also be component 3, component 4, component 5, component 6, component 7, etc., without specific limitation.

[0041] A 1 、B 1 、C 1 are the contents of component 1 in the initial batch, the content of component 1 in the transition batch, and the content of component 1 in the target batch in sequence, with the unit of %;

[0042] A 2 、B 2 、C 2 are the contents of component 2 in the initial batch, the content of component 2 in the transition batch, and the content of component 2 in the target batch in sequence, with the unit of %;

[0043] A n 、B n 、C n are the contents of component n in the initial batch, the content of component n in the transition batch, and the content of component n in the target batch in sequence, with the unit of %.

[0044] In some embodiments, when the unit of the preset batch change cycle is days, the unit of the hourly pulling rate of the first batch change treatment can also be converted to ton of molten glass per day.

[0045] In other embodiments, at least one set of transition batch formulas can also be determined according to the preset batch change cycle and the following formula (2).

[0046]

[0047] Among them, w is a preset coefficient less than 1.

[0048] In a further embodiment, the preset coefficient can be 0.6 to 0.95, and can be selected as 0.85 to 95. In an exemplary embodiment, the preset coefficient can be typical but non-limiting values such as 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc., or any value between any two numerical ranges.

[0049] There is an immobile layer at the bottom of the furnace. The glass liquid in this immobile layer hardly flows and does not participate in the batch change. Therefore, the influence of the immobile layer can be reduced by setting a coefficient w. In the demonstration example, when only 85% of the glass liquid participates in the batch change, the preset coefficient is 0.85. The size of the preset coefficient is related to factors such as the furnace structure and the temperature distribution in the furnace. For example, if there are baffles in the furnace, the immobile layer is less, and its w value is higher than that of a furnace without baffles. By setting the preset coefficient to reduce the influence of the immobile layer on the batch change, the transitional batch formula can be determined, thereby further shortening the batch change cycle.

[0050] Step S11:

[0051] During the batch change process, the contents of each component in the formula of the initial batch and the target batch are known conditions, and both M and Y are also known conditions. Through step S11, at least one preset batch change cycle is confirmed according to the actual production requirements, and then at least one preset batch change cycle and the known conditions are substituted into formula (1) to obtain the formula of the preset transitional batch corresponding to each preset cycle. Then, examine the temperature curve of each preset transitional batch. According to the temperature curve, the formula of the transitional batch can be determined based on the temperature curve and the bearing temperature of the furnace. This method of determining the transitional batch formula can not only effectively shorten the batch change cycle but also enable the batch change cycle to be flexibly adjusted according to the actual production requirements.

[0052] In some embodiments, the preset batch change cycle can be determined according to the actual production requirements. For example, it can be determined according to the production schedule. In the demonstration example, the preset batch change cycle can be 8 days, 12 days, 15 days, 18 days, etc., without specific limitation. The hourly drawing volume of the first batch change treatment can be determined according to the design of the furnace and the hourly drawing volume of daily production. Specifically, the hourly drawing volume of the first batch change treatment can be higher than the hourly drawing volume during normal production with the initial batch. For example, in the demonstration example, the hourly drawing volume during normal operation of the initial batch is 5 tons of glass liquid per hour, and the hourly drawing volume of the first batch change treatment can be 6 tons of glass liquid per hour.

[0053] In some embodiments, when the types of components contained in the formula of the initial batch and the target batch are the same but the contents are different, the contents of each component in the initial batch formula and the contents of each component in the target batch formula can be substituted into formula (1) for calculation to obtain the preset transitional batch formula. In the demonstration example, the formulas of the initial batch and the target batch both contain four components, namely component 1, component 2, component 3, and component 4, and the contents are all non-zero. Then, the contents A 1 、A 2 、A 3 and A 4 of each component in the initial batch and the contents C 1 、C 2 、C 3 and C 4Substituting into formula (1) for calculation, the contents of component 1, component 2, component 3 and component 4 in the preset transitional material can be obtained, which are B 1 、B 2 、B 3 and B 4 respectively.

[0054] In some embodiments, when the content of component 1 in the formula of the initial material is not zero, while the content of component 1 in the formula of the target material is zero, the value of C 1 in formula (1) can be the content limit of component 1 in the target product quality control standard corresponding to the formula of the target material, so as to use the content limit of component 1 in the target product as the value of C 1 and substitute it into formula (1) for calculation, so as to obtain the formula of the preset transitional material. As in the demonstration example, the initial material contains four components, namely component 1, component 2, component 3 and component 4, where component 1 is lithium oxide, and the content of component 1 (lithium oxide) in the formula of the initial material is 5%. The formula of the target material contains three components, namely component 2, component 3 and component 4, and the content of component 1 (lithium oxide) in the formula of the target material is zero. At this time, although the content of component A (lithium oxide) in the formula of the target material is zero, there are often trace or trace amounts of component 1 (lithium oxide) in the produced target product. Assuming that the mass limit of lithium oxide in the target product is 0.05%, the mass limit of lithium oxide in the target product, 0.05%, can be used as the value of C 1 in the calculation. Substitute C 1 = 0.05% into formula (1) to obtain a set of B 1 、B 2 、B 3 and B 4 values. At this time, the calculated value of B 1 is not zero. For example, it may be 0.03%. However, since the content of component 1 in the formula of the target material is zero, the content of component 1 in the preset transitional material should also be zero. Therefore, the value of B 1 should be taken as zero, and the calculated value of B 1 , 0.03%, can be distributed to the content values of other components in the formula of the preset transitional material, and can be distributed to the content values of any one of component 2, component 3 and component 4. For example, when the calculated B 2 is 60%, when the value of B 1 is distributed to the content of component 2, the content of component 2 in the preset transitional material can be 60.03% (that is, B 2 is 60.03%). Similarly, the calculated value of B 1 can also be distributed to the content values of component 3 and / or component 4.

[0055] In some embodiments, when the content of component 1 in the initial material formula is zero, while the content of component 1 in the target material formula is not zero, A in formula (1) or formula (2) 1 can take a value of zero.

[0056] In some other embodiments, when the content of component 1 in the initial material formula is zero, while the content of component 1 in the target material formula is not zero, A in formula (1) 1 can take the content limit of component 1 in the initial product quality control standard corresponding to the initial material formula, and use the content limit of component 1 as the value of A 1 Substitute the value of A into formula (1) for calculation, so as to obtain the formula of the preset intermediate material.

[0057] It should be noted that the content of each component in the initial material formula and the target material formula in formula (1) is the content of each component in its corresponding product, and the raw materials need to be converted during feeding. In the demonstration example, the content of calcium oxide in the target material formula is 3%. If the raw material used for feeding is calcium carbonate, it is necessary to convert calcium oxide and calcium carbonate in the raw material before feeding.

[0058] Step S12:

[0059] Determine at least one set of preset intermediate material temperature curves obtained in step S11 through step S12, and then determine the formula of the intermediate material according to at least one set of preset intermediate material temperature curves and the furnace bearing temperature.

[0060] In some embodiments, the temperature curve of the preset intermediate material can be obtained through experiments, so as to determine the melting temperature of the preset intermediate material, and compare the melting temperature with the furnace bearing temperature. If the melting temperature of the preset intermediate material is within the furnace bearing temperature range, that is, the melting temperature is lower than the furnace bearing temperature, the formula of the preset intermediate material can be determined as the formula of the intermediate material.

[0061] In some embodiments, those skilled in the art can also determine the formula of the intermediate material according to actual requirements and the furnace bearing temperature. For example, in some embodiments, in order to further protect the furnace, the formula of the preset intermediate material with a melting temperature below the furnace bearing temperature or within 90% of the furnace bearing temperature can be determined as the formula of the intermediate material. In some other embodiments, when the melting temperatures of multiple preset intermediate materials are lower than the furnace bearing temperature or 90% of the furnace bearing temperature, the formula of the preset intermediate material corresponding to the shortest preset material change cycle can be selected as the formula of the intermediate material.

[0062] Further, if there are multiple candidate recipes for the transition material that do not exceed the carrying temperature of the kiln, it is also possible to simulate the composition of the glass produced in each time period of the melting furnace after adding the candidate recipe for the transition material according to each candidate recipe for the transition material. According to the simulation results, select the candidate recipe for the transition material with the shortest time to reach the target material fluctuation range in the material change cycle in the simulation results as the final recipe.

[0063] In some embodiments, during the first material change process, it is also possible to adjust the insertion depth of the bubbler in the glass liquid, the bubbling gas volume, and the pressing depth of the throat water pocket, so as to further promote the discharge of the old material and the mixing of the new material in the kiln.

[0064] In a further embodiment, during the first material change process, the insertion depth of the bubbler in the glass liquid can be adjusted to the first bubbler depth, and the bubbling gas volume can be the first bubbling gas volume. Among them, the first bubbler depth is lower than the bubbler depth during the operation of the initial material, and the first bubbling gas volume is greater than the bubbling gas volume during the operation of the initial material. In a further embodiment, the first bubbler depth can be less than or equal to 1 / 5 of the glass liquid depth; the first bubbling gas volume can be such that the bubbling regions adjacent to the glass liquid surface intersect, and the intersection area is greater than or equal to half of the bubbling region area. By reducing the insertion depth of the bubbler into the glass liquid and increasing the bubbling gas volume, it is possible to effectively strengthen the circulation convection in the depth direction of the glass liquid and homogenize the glass liquid in the depth direction. It should be noted that in the embodiments of the present application, the bubbler depth refers to the depth of the bubbler air outlet from the bottom of the tank.

[0065] In some embodiments, during the first material change process, the pressing depth of the throat water pocket can also be adjusted to the first pressing depth of the throat water pocket, and the first pressing depth of the throat water pocket can be greater than the pressing depth of the throat water pocket during the operation of the initial material. In a further embodiment, the first pressing depth of the throat water pocket can be greater than or equal to 1 / 2 of the glass liquid depth. By reducing the pressing depth of the throat water pocket, it is possible to reduce the backflow in the working section, facilitate the replacement of the old material, and at the same time strengthen the homogenization of the transition material in the melting and clarification zone.

[0066] In some embodiments, during the first material change process, the hourly drawing amount can also be adjusted to the first hourly drawing amount, and the first hourly drawing amount can be greater than the hourly drawing amount during the operation of the initial material. The first hourly drawing amount can be the hourly drawing amount T of the first material change process in formula (1) above. By increasing the hourly drawing amount, it is possible to improve the circulation homogenization of the glass liquid flow, increase the discharge of the old material, and shorten the material change cycle.

[0067] In the demonstration example, the first material change process may include the following steps:

[0068] Put the transitional material into the kiln. After the transitional material enters the kiln, adjust the position of the bubbler as close as possible to the stationary layer at the bottom of the pool, reduce the depth of the bubbler inserted into the molten glass (i.e., the distance between the bubbling orifice of the bubbler and the bottom of the runner pool), so that the depth of the bubbler inserted into the molten glass is less than or equal to ≤1 / 5 of the molten glass depth. At the same time, adjust the bubbling gas volume according to the size of the bubbling area on the molten glass surface, so that the adjacent bubbling areas on the liquid surface intersect by more than half. At the same time, the bottom temperature of the feeding port can be adjusted to quickly increase the bottom temperature of the pool, so as to reduce the occurrence of composition stratification on the upper and lower surfaces of the glass plate. When the transitional material reaches the hot spot area, that is, the position with the highest temperature in the furnace, adjust the throttle water pocket in combination with the drawing rate. According to the load designed for the kiln and the runner chute, control the cross-section of the molten glass flowing through the throttle by reducing the depth of the throttle water pocket pressed in, reduce the backflow in the working section, and at the same time increase the drawing rate to balance the temperature in the working section, ensure that the temperature in the runner is above the working point temperature, accelerate the homogenization and discharge of the molten glass at the bottom layer of the working section, and speed up the replacement speed of the old material. It is also possible to adjust the air and gas of the hot air gun in the working section to achieve the effect of cooling or heating, so as to control the temperature of the runner in the working section and reduce the invisible damage to the runner chute caused by temperature fluctuations. In the embodiment of the present application, the working point temperature refers to the temperature corresponding to the glass viscosity of 10 4.0 dPa.

[0069] Step S20:

[0070] When the content difference of the same components between the molten glass in the kiln and the target material is less than or equal to the corresponding preset threshold, start feeding the target material, and use the target material to perform the second material replacement treatment on the molten glass in the kiln after the first material replacement treatment.

[0071] It should be noted that the preset threshold is the absolute value of the content difference between the same components of the molten glass in the kiln and the target material. In some embodiments, the preset threshold can be set according to actual needs. For example, it can be set according to the glass performance requirements of the glass to be produced, the influence of different components on the glass performance, the acceptable limit of the content of different components in the glass, and the production requirements of the glass. In the demonstration example, the preset threshold can be 0.2%, or it can be 0.15%, which is not specifically limited.

[0072] In a further embodiment, the preset thresholds of different components in the same material replacement process can be the same or different, which is not specifically limited. In the demonstration example, the preset threshold of the SiO 2 component can be 0.2%, and the preset threshold of the Al 2 O 3 component can be 0.15%, and the preset threshold of the Na 2The preset threshold for the O component is 0.1%. The preset threshold for components with non-zero content before material change but zero content after material change can be 0.2%. Controlling the preset threshold within a range can make the component content of the glass melt in the furnace closer to that of the target material, thereby further promoting the uniformity and stability of the glass melt in the furnace as soon as possible, reaching the conditions for normal production as soon as possible, and effectively shortening the material change cycle.

[0073] In some embodiments, the components of the glass melt in the furnace can be monitored during the first material change process to determine whether the content difference of the same components between the glass melt in the furnace and the target material meets the preset threshold, that is, within the normal fluctuation range of the target material. By monitoring the components of the glass melt in the furnace and controlling the difference between the composition of the glass melt in the furnace and the formula of the target material at the start of the second material change process, the stability and homogenization of the components of the glass melt in the furnace and the stability of the glass melt flow are further promoted after the target material is fed, thereby shortening the time of the material change process and preparing for the normal operation and production of the subsequent target material as soon as possible.

[0074] In some embodiments, the components of the glass melt in the furnace can also be directly detected to monitor the composition of the glass melt in the furnace.

[0075] In other embodiments, the composition of the glass melt in the furnace can be monitored by detecting the replaced glass components. Monitoring the composition of the glass melt in the furnace by detecting the replaced glass components is more convenient for sampling operations and more in line with the actual production process.

[0076] In some embodiments, the second material change process can also be started at the theoretical time point. The theoretical time point is the time point determined by adding the time when the transition material starts to be fed and the preset material change cycle corresponding to the transition material. In the demonstration example, the preset material change cycle corresponding to the transition material is 20h, and the start time of the first material change process is 14:00 in the afternoon. Then 14:00 in the afternoon plus 20h, that is, 10:00 in the morning of the next day is the theoretical time point. It should be noted that the start time of the second material change process can also fluctuate within a certain range before and after the theoretical time point. For example, it can fluctuate within one hour before and after the theoretical time point, and start the second material change process within typical but non-limiting times such as half an hour before and after. In the demonstration example, the theoretical time point is 10:00 in the morning, and the second material change process can be started within a range of half an hour before and after the theoretical time point, that is, it can be started between 9:30 and 10:30 in the morning. Starting the second material change process through the theoretical time point can reduce the frequent detection of the glass melt composition during the first material change process and further reduce the material change cost.

[0077] In some embodiments, during the first batch replacement process in step S11, the composition of the molten glass in the furnace can also be monitored regularly or irregularly at different time points. Based on the composition of the molten glass in the furnace corresponding to each time point, the changing trend of the components of the molten glass in the furnace can be predicted, and the time point when the composition of the molten glass in the furnace is close to the target batch formula can be predicted, or the time point when the content difference of the same components between the molten glass in the furnace and the target batch is less than or equal to a preset threshold can be predicted, and this time point is used as the predicted time point. After confirming this predicted time point, compare the predicted time point with the theoretical time point in the above text. If the theoretical time point is close to the predicted time point, the second batch replacement process can be started at the theoretical time point or the predicted time point.

[0078] In some embodiments, when monitoring the content of components in the molten glass in the furnace, the content of two or more components in the molten glass can be monitored, so as to predict the time point when the content difference between the contents of multiple components in the molten glass in the furnace and the corresponding components in the target batch formula is less than or equal to a preset threshold based on the content changes of the two or more components, and this time point is used as the predicted time point. Of course, the content of one component in the molten glass can also be monitored, so as to predict the time point when the content difference between this component in the molten glass in the furnace and this component in the target batch formula meets the preset threshold, and this time point is used as the predicted time point.

[0079] It should be noted that the fact that the theoretical time point is close to the predicted time point does not mean that the two are exactly the same, and there can be a certain difference between the two time points. For example, in the demonstration example, when the preset batch replacement cycle is 20 hours, the theoretical time point is 20 h after the start of the first batch replacement process, and the predicted time point can be half an hour, one hour or two hours different from the theoretical time point.

[0080] In some embodiments, when the target batch has run in the furnace for greater than or equal to 1 cycle, the depth of the bubbler can be adjusted to the second bubbler depth, and the pressing depth of the throat water pocket can be adjusted to the second pressing depth of the throat water pocket. Among them, the second bubbler depth is higher than the first bubbler depth, and the second pressing depth of the throat water pocket is higher than the first pressing depth of the throat water pocket, that is, compared with the first bubbler depth, the second bubbler depth is closer to the liquid surface of the molten glass, and compared with the first pressing depth of the throat water pocket, the second pressing depth of the throat water pocket is closer to the liquid surface of the molten glass.

[0081] In a further embodiment, the second bubbler depth can be 1 / 3 - 2 / 3 of the molten glass depth. When adjusting to the second bubbler depth, the bubbling gas volume can also be adjusted so that the size of the bubbling area on the liquid surface is tangent to each other. The pressing depth of the second throat water pocket can be the same as the pressing depth of the throat water pocket during the operation of the initial batch. By increasing the bubbler depth, reducing the bubbling gas volume, and increasing the pressing depth of the throat water pocket, the liquid flow stability can be further promoted, thereby further preparing for subsequent production.

[0082] In a second aspect, an embodiment of the present application provides a float glass. When preparing the float glass according to the embodiment of the present application, the material change method described above is used for material change treatment.

[0083] When preparing the float glass according to the embodiment of the present application, the material change treatment method described above is adopted, which effectively improves the production efficiency of the float glass according to the embodiment of the present application, reduces the production cost, and makes the float glass more competitive in the market.

[0084] To enable those skilled in the art to clearly understand the above-mentioned implementation details and operations of the present application, and to significantly reflect the progressive performance of the glass production material change method and the application of float glass according to the embodiments of the present application, the above technical solutions will be illustrated by multiple embodiments as follows.

[0085] Embodiment 1

[0086] This embodiment provides a glass production material change method. The formulations of the initial material and the target material in the material change method of this embodiment are shown in Table 1. The material change method of this embodiment includes the following steps:

[0087] Step G1: According to formula (2) described above, the formulations of the initial material and the target material in Table 1, and the drawing rate in Table 3, the total amount M of the glass liquid actually carried by the furnace is 900t, w is 0.9, and multiple preset material change cycles are designed to be 8 days, 9 days, and 10 days respectively, and the formulations of multiple preset transition materials are calculated.

[0088] Step G2: Measure the temperature curves of different preset transition materials in Step G1, and select the preset transition material formulation with a melting temperature not exceeding the furnace bearing temperature of 1650°C and the shortest corresponding preset material change cycle as the transition material formulation of this embodiment. This transition material formulation is shown in Table 1.

[0089] Step G3: According to the transition material formulation selected in Step G2, use the transition material to perform the first material change treatment on the initial material in the furnace. Put the transition material into the furnace, reduce the depth of the bubbler inserted into the glass liquid as shown in Table 3, increase the bubbling gas volume to that shown in Table 3, make the bubbling areas on the liquid surface intersect by more than half pairwise, strengthen the circulation convection in the depth direction of the glass liquid, and homogenize the glass liquid in the depth direction. When the transition material reaches the hot spot area (the area with the highest temperature in the melting furnace), adjust the pressing depth of the throat water pocket and the hourly drawing rate as shown in Table 3.

[0090] Step G4: During the first material change treatment, taking the start of feeding the transition material as the time zero point, at different time points, take the replaced glass for component detection respectively. The detection results are shown in Table 2. The content difference between the glass liquid in the furnace and the same component in the target material formulation meets the preset threshold at 176h. Among them,

[0091] Step S4: At 176 h, when the content difference between the glass liquid in the kiln and the same component in the target material formula meets the preset threshold, the target material is used for the second material change treatment, and the monitoring of the glass liquid in the kiln is continued. After the target material passes through one cycle in the kiln, immediately adjust the bubbler to the depth, bubbling gas volume, the depth of the neck water pocket pressed in, and the hourly drawing amount to the sizes during normal production as shown in Table 3. Wait for the liquid flow to stabilize, prepare for normal production, and complete the material change. The total material change cycle of the material change method in this embodiment is shown in Table 3.

[0092] Table 1

[0093] Component Initial feed formula Target feed formula Transition feed formula Preset threshold <![CDATA[SiO 2 > 62.08％ 62.34％ 62.98％ 0.20％ <![CDATA[Al 2 O 3 > 18.88％ 15.56％ 12.68％ 0.15％ <![CDATA[Sodium 2 O]]> 8.01％ 9.40％ 10.46％ 0.10％ <![CDATA[K 2 O]]> 2.67％ 3.45％ 3.97％ 0.10％ MgO 3.92％ 4.68％ 5.18％ 0.10％ <![CDATA[Li 2 O]]> 0.00％ 1.44％ 2.54％ 0.10％ <![CDATA[ZrO 2 > 4.02％ 3.13％ 2.19％ 0.10％ CaO 0.42％ 0.00％ 0.00％ 0.20％

[0094] Table 2

[0095] Cumulative time / h 0 16 32 48 64 80 96 112 <![CDATA[SiO 2 / %]]> 62.08 62.19 62.25 62.31 62.36 62.41 62.45 62.49 <![CDATA[Al 2 O 3 / %]]> 18.88 18.18 17.75 17.36 17.00 16.67 16.36 16.08 <![CDATA[Sodium 2 O / %]]> 8.01 8.28 8.45 8.61 8.75 8.88 9.00 9.11 <![CDATA[K 2 O / %]]> 2.67 2.82 2.90 2.99 3.06 3.13 3.20 3.26 MgO / % 3.92 4.06 4.15 4.23 4.30 4.37 4.43 4.49 <![CDATA[Li 2 O / %]]> 0 0.29 0.46 0.62 0.77 0.90 1.03 1.15 <![CDATA[ZrO 2 / %]]> 4.02 3.81 3.69 3.57 3.46 3.37 3.28 3.19 CaO / % 0.42 0.37 0.34 0.32 0.29 0.27 0.25 0.23 Cumulative time / h 128 144 160 176 192 208 224 240 <![CDATA[SiO 2 / %]]> 62.53 62.57 62.55 62.53 62.52 62.50 62.49 62.48 <![CDATA[Al 2 O 3 / %]]> 15.82 15.58 15.58 15.58 15.57 15.57 15.57 15.57 <![CDATA[Na 2 O / %]]> 9.22 9.31 9.32 9.32 9.33 9.34 9.34 9.35 <![CDATA[K 2 O / %]]> 3.31 3.36 3.37 3.37 3.38 3.39 3.39 3.40 MgO / % 4.54 4.59 4.60 4.60 4.61 4.62 4.62 4.63 <![CDATA[Li 2 O / %]]> 1.25 1.35 1.36 1.37 1.37 1.38 1.38 1.39 <![CDATA[ZrO 2 / %]]> 3.11 3.04 3.05 3.06 3.06 3.07 3.07 3.08 CaO / % 0.21 0.20 0.18 0.17 0.15 0.14 0.13 0.12

[0096] Examples 2 to 4

[0097] Examples 2 to 4 respectively provide a glass production material change method. The steps of the material change methods in Examples 2 to 4 are basically the same as those in Example 1. The difference is that the formulas of the initial material, target material, and transition material, the drawing amount, the depth of the neck water pocket pressed in, the depth of the bubbler outlet from the bottom of the pool, the bubbling gas volume, and the time to switch the target material formula in this embodiment are as shown in Tables 3 and 4.

[0098] Table 3

[0099]

[0100] Table 4

[0101]

[0102]

[0103] Comparative Example 1

[0104] This comparative example provides a glass production material change method. The formulas of the initial material and the target material in the material change method of this comparative example are the same as those in Example 1, and the depth of the bubbler, the bubbling gas volume, the depth of the neck water pocket pressed in, and the hourly drawing amount during normal production in this comparative example are the same as those of the bubbler bottom depth, the bubbling gas volume, the depth of the neck water pocket pressed in, and the hourly drawing amount during normal production in Example 1. The depth of the bubbler, the bubbling gas volume, the depth of the neck water pocket pressed in, and the hourly drawing amount during the material change in this comparative example are the same as those of the bubbler bottom depth, the bubbling gas volume, the depth of the neck water pocket pressed in, and the hourly drawing amount during the first material change treatment in Example 1.

[0105] The material change method of this comparative example includes the following steps:

[0106] Step G1: Put the target material into the kiln for material change treatment, and adjust the depth of the bubbler, the bubbling gas volume, the pressing depth of the neck water pocket, and the hourly drawing volume as shown in the parameters of the first material change treatment in Table 5. Until the glass liquid composition in the kiln is the same as the target material formula, then adjust the depth of the bubbler, the bubbling gas volume, the pressing depth of the neck water pocket, and the hourly drawing volume as shown in normal production in Table 5. Wait for the liquid flow to be stable and prepare for normal production. The total material change cycle of the material change method in this embodiment is shown in Table 5.

[0107] Comparative Example 2

[0108] This comparative example provides a glass production material change method. The initial material formula and the target material formula in the material change method of this comparative example are the same as those in Example 4. The material change method of this comparative example is basically the same as the material change method of Comparative Example 1.

[0109] Table 5

[0110]

[0111]

[0112] As shown in Tables 3 to 5, the material change methods of Examples 1 to 4 using transitional materials have a short material change cycle. Comparing Example 1 with Comparative Example 1, and Example 4 with Comparative Example 2, the material change cycles of Example 1 and Comparative Example 4 are significantly shortened. This shows that the material change method of the embodiments of the present application first performs the first material change treatment with transitional materials and then performs the second material change treatment with the target material. The material change cycle is comparable to that of the net-empty material change, and there is no need to open holes in the kiln to drain water during the material change process. The overall process is controllable and the damage to the kiln body is small.

[0113] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A glass production material replacement method, characterized in that: The steps include: Using transition material to carry out the first material replacement process on the initial material in the kiln; When the content difference of the same component between the glass produced in the kiln and the target material is less than or equal to the corresponding preset threshold value, the target material is used to perform a second material replacement treatment on the glass liquid in the kiln after the first material replacement treatment; Among them, the content difference of the same component between the initial material, the transition material and the target material satisfies Δ1=Δ2+Δ3, wherein Δ1 is the content difference of the same component between the transition material and the initial material, Δ2 is the content difference of the same component between the target material and the initial material, and Δ3 is the content difference of the same component between the transition material and the target material.

2. The material replacement method according to claim 1, characterized in that: The material replacement method also includes the following steps: Determining at least one set of preset transition material recipes according to at least one preset material change cycle and formula (1); Determining a temperature curve of the at least one set of preset transition materials, and determining a formula of the transition materials according to the temperature curve of the at least one set of preset transition materials and a kiln load temperature; Among them, M is the total amount of glass liquid actually carried by the kiln, in tons; T is the preset material replacement cycle, in h; Y is the hourly pulling amount of the first material replacement process, in tons of glass liquid / hour; 1, 2, n represent component 1, component 2 and component n respectively, ... represent other components between component 2 and component n that are not exhaustive; A1, B1, C1 are the content of component 1 in the initial material, the content of component 1 in the transition material, and the content of component 1 in the target material, respectively, in %; A2, B2, C2 are respectively the content of component 2 in the initial material, the content of component 2 in the transition material and the content of component 2 in the target material, in %; A n , B n , C n They are, in order, the content of component n in the initial material, the content of component n in the transition material, and the content of component n in the target material, in %.

3. The material replacement method according to claim 1, characterized in that: The material replacement method also includes the following steps: Determining at least one set of preset transition material recipes according to at least one preset material change cycle and formula (2); Determining a temperature curve of the at least one set of preset transition materials, and determining a formula of the transition materials according to the temperature curve of the at least one set of preset transition materials and a kiln load temperature; Wherein, w is a preset coefficient less than 1.

4. The material replacement method according to claim 2 or 3, characterized in that: The melting temperature of the transition material is within the temperature range supported by the kiln.

5. The material replacement method according to claim 4, characterized in that: The first material replacement process also includes adjusting the insertion depth of the bubbler in the glass liquid to the first bubbler depth, the bubbling gas volume to the first bubbling gas volume, the neck water bag pressure depth to the first neck water bag pressure depth and the hourly pulling amount to at least one of the first hourly pulling amount; Among them, the first bubbler depth is less than the bubbler depth when the initial material is running, the first bubbling gas volume is greater than the bubbling gas volume when the initial material is running, the first neck water bag pressure depth is greater than the neck water bag pressure depth when the initial material is running, and the first hourly pulling amount is the hourly pulling amount of the first material change treatment, which is greater than the hourly pulling amount when the initial material is running.

6. The material replacement method according to claim 5, characterized in that: The depth of the first bubbler is less than or equal to 1 / 5 of the depth of the molten glass; and / or The first clamping neck water bag is pressed into a depth greater than or equal to 1 / 2 of the depth of the glass liquid.

7. The material replacement method according to claim 5, characterized in that: The first bubbling gas volume is such that adjacent bubbling regions of the glass liquid surface intersect, and the intersection area is greater than or equal to half of the area of ​​the bubbling region.

8. The material replacement method according to claim 5, characterized in that: The material replacement method also includes: When the target material runs in the kiln for more than or equal to one cycle, the depth of the bubbler is adjusted to the second bubbler depth, and the depth of the neck water bag is adjusted to the second neck water bag depth; Among them, the depth of the second bubbler is higher than the depth of the first bubbler, and the depth of the second clamping neck water bag being pressed into is higher than the depth of the first clamping neck water bag being pressed into.

9. The material replacement method according to claim 8, characterized in that: The depth of the second bubbler is 1 / 3 to 2 / 3 of the depth of the glass liquid; and / or The pressing depth of the second water bag is the same as the pressing depth of the water bag when the initial material is running.

10. The material replacement method according to claim 8, characterized in that: The initial material in the kiln is subjected to a first material replacement process using transition material and cullet corresponding to the initial material.

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