Method for manufacturing a glass article and apparatus for manufacturing a glass article
By employing electric heating and a dry collection process in a glass melting furnace, combined with dry and wet treatment technologies, the high cost problem in existing technologies has been solved, achieving low-cost and high-efficiency dust recovery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NIPPON ELECTRIC GLASS CO LTD
- Filing Date
- 2022-03-10
- Publication Date
- 2026-06-12
AI Technical Summary
Existing technologies for recovering dust from glass melting furnace exhaust gases require large-scale wastewater treatment equipment and high power consumption, leading to increased operating and initial costs.
The process mainly involves melting glass raw materials through an electric heating process, combined with dry and wet collection processes to treat waste gas. Dry cooling and separation devices are used to recover dust, avoiding the use of spray towers and wet electrostatic precipitators, thus reducing dependence on water and electricity.
It enables low-cost and efficient dust recovery from glass melting furnace exhaust gas, reducing maintenance and operating costs while minimizing environmental impact.
Smart Images
Figure CN116940535B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for manufacturing glass articles and improvements to an apparatus for manufacturing glass articles. Background Technology
[0002] In a glass melting furnace, powdered or granular glass raw materials are heated by igniting a burner that burns fuel (such as hydrocarbon gases like natural gas) and by passing electricity between electrodes to produce molten glass. This molten glass then undergoes a prescribed forming process to become various glass products such as glass sheets, glass tubes, and glass fibers.
[0003] At this time, the exhaust gas generated from the glass melting furnace contains some of the components contained in the glass raw materials in gaseous or micro-solid form. Therefore, the exhaust gas also contains a significant amount of components that can be recycled as glass raw materials. Thus, if raw materials can be recovered and recycled from the exhaust gas, it can help conserve glass raw materials. In addition, it also protects the environment.
[0004] As one method, for example, Patent Document 1 discloses a technique for recovering boron-containing recycled raw materials from the exhaust gas of a glass melting furnace that melts boron-containing glass raw materials. Specifically, when the exhaust gas discharged from the glass melting furnace is cooled in a spray tower using a spray of cooling water, boron contained in the exhaust gas as a gas precipitates as a solid (dust) and is captured by the cooling water (collecting liquid). The boron passing through the spray tower comes into contact with water from a wet electrostatic precipitator and is captured by that water (collecting liquid). A neutralizing agent such as quicklime is added to the boron-containing collecting liquid, and impurity removal and other treatments are performed, thereby recovering boron as a recycled raw material (see Patent Document 1).
[0005] Existing technical documents
[0006] Patent documents
[0007] Patent Document 1: Japanese Patent Application Publication No. 2013-180284 Summary of the Invention
[0008] The problem that the invention aims to solve
[0009] However, when recovering boron using wet equipment such as spray towers and wet electrostatic precipitators, large-scale wastewater treatment equipment is required, which increases operating costs and initial costs due to increased power consumption.
[0010] The objective of this invention is to recover dust from the exhaust gas discharged from a glass melting furnace in a low-cost and highly efficient manner.
[0011] Solution for solving the problem
[0012] A method for manufacturing a glass article includes: a melting step, wherein glass raw material is heated in a melting furnace to obtain molten glass; a forming step, wherein the molten glass is formed into a glass article; and an exhaust gas treatment step, wherein dust is removed from exhaust gas discharged from the melting furnace. The method for manufacturing the glass article is characterized in that the melting step includes an electrothermal step, which melts the glass raw material primarily by electrothermal heating of electrodes; the exhaust gas treatment step includes a dry collection step, which treats the exhaust gas discharged from the melting furnace during the electrothermal step; the dry collection step includes a dry cooling step, which mixes cooling gas with the exhaust gas; and a dry separation step, which separates the dust from the exhaust gas after the dry cooling step using a dry separation device.
[0013] Electric heating and combustion heating are used as heating methods for melting glass raw materials in a melting furnace. Electric heating is a method of heating molten glass by passing an electric current between electrodes immersed in the molten glass. Combustion heating is a method of heating both the glass raw material and the molten glass by burning fuel in the melting furnace. The exhaust gas generated by electric heating contains a lower proportion of water vapor than the exhaust gas generated by combustion heating. When the exhaust gas contains a high proportion of water vapor, it is prone to clogging in dry separation devices such as bag filters, potentially increasing maintenance costs. Therefore, if the electric heating process, which mainly uses the electric heating of electrodes to melt the glass raw material, is used, the lower proportion of water vapor in the exhaust gas can suppress clogging and reduce maintenance costs. Furthermore, exhaust gas treatment can be performed without the use of spray towers, wet electrostatic precipitators, wastewater treatment equipment, neutralizing agents, or other chemicals, allowing for low-cost and efficient dust recovery from the exhaust gas.
[0014] In the above-described structure, it is preferable that the dry separation device is a bag filter. This structure allows for the recovery of dust from exhaust gas at a lower cost.
[0015] In the above structure, preferably, the melting process includes a combustion heating process that melts the glass raw material by at least using combustion heating with a burner, and the exhaust gas treatment process includes a wet trapping process that treats the exhaust gas discharged from the melting furnace during the combustion heating process, the wet trapping process including a wet cooling process that distributes coolant to the exhaust gas. The exhaust gas discharged from the melting furnace during the combustion heating process contains a high proportion of water vapor. The wet trapping process can handle exhaust gas with a high proportion of water vapor without hindrance. Therefore, by performing the wet trapping process during combustion heating, exhaust gas treatment can be performed efficiently. The combustion heating process and the wet trapping process are performed temporarily, for example, during the start-up of the melting furnace, rather than using a spray tower or the like continuously as in Patent Document 1. Therefore, the spray tower or the like can be shared with other melting furnaces or the like, and operating costs and initial costs can be reduced.
[0016] In the above structure, preferably, the wet collection process includes a wet separation process that uses a wet separation device to separate the dust from the exhaust gas after the wet cooling process. According to this structure, dust can be recovered from the exhaust gas more reliably.
[0017] In the above-described structure, it is preferable that the wet separation device is a wet electrostatic precipitator. This structure allows for more reliable and lower-cost recovery of dust from exhaust gas.
[0018] In the above structure, it is preferable that the temperature of the exhaust gas after the dry cooling process is below 60°C. According to this structure, components contained in the exhaust gas in a gaseous state can be precipitated as solids and recovered in the dry separation process.
[0019] In the above-described structure, it is preferable that the volume fraction of water vapor contained in the exhaust gas discharged from the furnace during the electrothermal heating process is 10% or less. According to this structure, even after a dry cooling process, the water vapor contained in the exhaust gas does not condense, enabling efficient dry collection.
[0020] In the above structure, preferably, the glass raw material contains boron, and the waste gas treatment process includes a recovery process for recovering boron from the dust. According to this structure, the recovered boron can be reused as a glass raw material. It should be noted that "boron" as used herein includes boron compounds such as boron oxide and boric acid (hereinafter the same).
[0021] In the above structure, preferably, the waste gas treatment process includes a denitrification process that removes nitrogen oxides from the waste gas after the dry or wet collection process. This structure reduces the amount of nitrogen oxides released into the environment from the waste gas.
[0022] In the above-described structure, it is preferable that the temperature of the cooling gas is 15°C or higher. This structure allows components contained in the exhaust gas in a gaseous state to precipitate as solids. Furthermore, the exhaust gas undergoing the dry cooling process is not over-cooled, thus preventing condensation of water vapor contained in the exhaust gas. This prevents clogging of the dry separation unit and corrosion of the equipment.
[0023] In the above structure, it is preferable that the cooling gas is heated by waste heat from the melting furnace. When the external temperature is 15°C or higher, the external gas can be directly used as the cooling gas. On the other hand, when the external temperature is less than 15°C, in order to prevent condensation of water vapor contained in the waste gas, it can be used as a cooling gas by heating it to 15°C or higher. By using waste heat from the melting furnace when heating the external gas, the energy used can be reduced.
[0024] Furthermore, the glass article manufacturing apparatus of the present invention includes: a melting furnace for heating glass raw materials to obtain molten glass; a forming apparatus for forming the molten glass into glass articles; and an exhaust gas treatment device for removing dust from exhaust gas discharged from the melting furnace. The glass article manufacturing apparatus is characterized in that an electrothermal process, primarily involving heating the glass raw materials by electrothermal contact with electrodes, is performed in the melting furnace. The exhaust gas treatment device includes a dry collection device comprising a dry cooling device for mixing cooling gases into the exhaust gas and a dry separation device for separating the dust from the exhaust gas using a bag filter. The dry collection device treats the exhaust gas discharged from the melting furnace during the electrothermal process. With this structure, dust can be recovered from the exhaust gas discharged from the glass melting furnace at low cost and high efficiency.
[0025] Invention Effects
[0026] According to the present invention, dust can be recovered from the exhaust gas discharged from the glass melting furnace in a low-cost and efficient manner. Attached Figure Description
[0027] Figure 1 This is a schematic diagram illustrating the overall structure of a method for manufacturing a glass article according to an embodiment of the present invention.
[0028] Figure 2 This is a schematic diagram showing the overall structure of a glass article manufacturing apparatus according to an embodiment of the present invention. Detailed Implementation
[0029] Hereinafter, an embodiment of the method for manufacturing glass articles according to the present invention will be described with reference to the accompanying drawings.
[0030] like Figure 1 as well as Figure 2 As shown, the method for manufacturing glass articles in this embodiment includes a melting process S1, a forming process S2, and a waste gas treatment process S3.
[0031] In the melting process S1, glass raw material Gr, adjusted to a predetermined composition ratio, is supplied to the melting furnace 1 using a raw material feeding device 11. For example, a screw feeder can be used as the raw material feeding device 11. In the melting furnace 1, the glass raw material Gr is heated to obtain molten glass Gm. Along with the heating of the glass raw material Gr and the molten glass Gm, exhaust gas Gs is discharged from the melting furnace 1. The melting process S1 includes an electric heating process S11 and a combustion heating process S12.
[0032] The electrothermal heating step S11 is a step in which the glass raw material Gr is heated primarily by electrothermal heating using electrodes (not shown). In the electrothermal heating step S11, combustion heating can be used as an auxiliary method, but it is preferable to heat the glass raw material Gr solely by electrothermal heating without using combustion heating. When combustion heating is used as an auxiliary method, it is preferable to set the volume fraction of water vapor contained in the exhaust gas Gs to 10% or less, more preferably 8% or less, and even more preferably 5% or less. It is also preferable that the calorific value generated by electrothermal heating accounts for 90% or more of the total calorific value generated by combustion heating and the calorific value generated by electrothermal heating. In this embodiment, the electrothermal heating step S11 is performed during operation, continuously supplying the glass raw material Gr to the melting furnace 1 and continuously discharging molten glass Gm from the melting furnace 1.
[0033] The combustion heating step S12 is a step in which the glass raw material Gr is heated by combustion heating using a burner at least. In the combustion heating step S12, the glass raw material Gr can be heated either solely by combustion heating or supplemented by electric heating. In this embodiment, the combustion heating step S12 is performed during startup before operation. In this case, the glass raw material Gr is supplied to the melting furnace 1 continuously or intermittently.
[0034] The exhaust gas Gs discharged from the melting furnace 1 contains combustion gases from the burner and volatiles from the glass raw material Gr and the molten glass Gm. The combustion gases contain carbon dioxide, water vapor, nitrogen oxides, and sulfur oxides. The volatiles contain boron.
[0035] In the electrically heated process, the molten glass Gm is heated by passing an electric current between electrodes immersed in it. When the glass raw material Gr is heated solely by electrically heated material, the exhaust gas Gs does not contain combustion gases.
[0036] Combustion heating uses burners such as air burners and oxygen burners. Oxygen burners are preferred due to their high heating efficiency and low exhaust gas (Gs) content. Natural gas or other gaseous fuels are used as fuel for the burners. Gaseous fuels with low sulfur compound content are preferred. Therefore, the sulfur oxide removal process can be omitted in the exhaust gas treatment step S3 described later, and the deterioration of the exhaust gas treatment equipment 3 due to the generation of sulfurous acid and sulfuric acid can be prevented.
[0037] Electric heating has advantages such as low waste gas volume (Gs), low water vapor content in waste gas (Gs), and good heating efficiency for molten glass (Gm). However, because it is difficult to flow current in the glass raw material (Gr) and the solidified glass, it is difficult to obtain molten glass (Gm) by electric heating when starting up the melting furnace 1 or when restarting it after a temporary shutdown. Therefore, when starting up and restarting the melting furnace 1, a method is used to initially obtain molten glass (Gm) by heating only through combustion and then gradually increasing the proportion of electric heating.
[0038] The molten glass Gm obtained from the melting process S1 is fed to the forming device 2 and undergoes the forming process S2. In the forming process S2, the molten glass Gm is formed into glass articles Gp of a specified shape, such as glass sheets, tubular glass, or glass fibers. For example, when forming glass sheets, float glass, overflow down-draw glass, slit down-draw glass, or flattening glass are used.
[0039] The exhaust gas Gs discharged from the melting furnace 1 is introduced into the exhaust gas treatment equipment 3 and undergoes the exhaust gas treatment process S3. The exhaust gas treatment equipment 3 includes a dry collection device 31, a wet collection device 32, a denitrification device 33, and a recovery device 34. Furthermore, the exhaust gas treatment process S3 includes the dry collection process S31, the wet collection process S32, the denitrification process S33, and the recovery process S34.
[0040] The exhaust gas Gs11 discharged from the molten furnace 1, which undergoes the electric heating process S11, is introduced into the dry collection device 31 and subjected to the dry collection process S31. The dry collection device 31 includes a dry cooling device 311 and a dry separation device 312. Furthermore, the dry collection process S31 includes a dry cooling process S311 and a dry separation process S312.
[0041] The exhaust gas Gs11 introduced into the dry collection device 31 is initially introduced into the dry cooling device 311 and undergoes a dry cooling process S311. In the dry cooling process S311, a cooling gas Gc is mixed with the exhaust gas Gs11, which is at approximately 80°C to 300°C, to lower its temperature. The temperature of the mixed cooling gas Gc is preferably 15°C or higher, more preferably 20°C or higher. The temperature of the cooled exhaust gas Gs12 is preferably 15°C or higher and 60°C or lower, more preferably 20°C or higher and 40°C or lower. When the temperature of the cooled exhaust gas Gs12 is too low, the water vapor contained in the exhaust gas Gs12 condenses, producing water droplets. These water droplets cause negative effects such as clogging of the bag filter and corrosion of the piping, as described later. On the other hand, when the temperature of the exhaust gas Gs12 is too high, the boron contained in the exhaust gas Gs in a gaseous state cannot precipitate as a solid, therefore the boron cannot be recovered in the dry separation process S312 described later, and it flows into the atmosphere. Furthermore, when the temperature of the external gas is 15°C or higher, it is preferable to introduce and use the external gas as cooling gas Gc. When the temperature of the external gas is less than 15°C, it is preferable to heat the external gas using waste heat from the melting furnace 1 and use it as cooling gas Gc. By utilizing waste heat from the melting furnace 1, energy used to maintain the cooling gas Gc at its optimal temperature can be saved.
[0042] The exhaust gas Gs12, after passing through the dry cooling process S311, is introduced into the dry separation unit 312 and undergoes the dry separation process S312. In the dry separation process S312, as the exhaust gas Gs12 passes through the dry separation unit 312, dust containing boron in a solid state is separated from the exhaust gas Gs12. A bag filter, which can be used at low cost, is preferably used as the dry separation unit 312.
[0043] The exhaust gas Gs21 discharged from the furnace 1 undergoing the combustion heating process S12 is introduced into a wet scrubbing device 32 and subjected to a wet scrubbing process S32. The wet scrubbing device 32 includes a wet cooling device 321 and a wet separation device 322. Furthermore, the wet scrubbing process S32 includes a wet cooling process S321 and a wet separation process S322. Because the exhaust gas Gs discharged from the furnace 1 undergoing the combustion heating process S12 contains a high proportion of water vapor, water vapor easily condenses during cooling. Therefore, when a separation process using filters such as bag filters is performed, clogging is easily caused, increasing maintenance costs. In order to separate boron-containing dust from the exhaust gas Gs without being affected by condensation while controlling costs, a wet scrubbing process S32 is preferable.
[0044] The exhaust gas Gs21 introduced into the wet collection device 32 is first introduced into the wet cooling device 321 (e.g., a spray tower) and undergoes a wet cooling process S321. In the wet cooling process S321, a coolant Lc is distributed into the exhaust gas Gs21 to lower its temperature. The temperature of the cooled exhaust gas Gs22 is preferably 60°C or higher and 70°C or lower. In this way, by lowering the temperature of the exhaust gas Gs22, most of the boron contained in the exhaust gas Gs in a gaseous state can be precipitated as a solid and recovered. Water or lime water can be used as the coolant Lc. Alternatively, a liquid containing boron captured by the wet separation device 322 (described later) can also be used. As the exhaust gas Gs21 comes into contact with the coolant Lc, the coolant Lc captures boron in either a solid (dust) or gaseous state from the exhaust gas Gs21.
[0045] The exhaust gas Gs22, after undergoing the wet cooling process S321, is preferably introduced into the wet separation device 322 and subjected to the wet separation process S322. In the wet separation process S322, as the exhaust gas Gs22 passes through the wet separation device 322, boron in solid (dust) or gaseous state is captured from the exhaust gas Gs22 by contacting a liquid (e.g., water). For the wet separation device 322, a wet electrostatic precipitator is preferably used due to its high separation performance of dust and droplets from the exhaust gas Gs22.
[0046] The waste gas Gs13, which has undergone the dry collection process S31, and the waste gas Gs23, which has undergone the wet collection process S32, are preferably introduced into the denitrification equipment 33 and subjected to the denitrification process S33. In the denitrification process S33, after ammonia is mixed into the waste gas Gs13 and waste gas Gs23 as a reducing agent, the nitrogen oxides contained in the waste gas Gs13 and waste gas Gs23 are reduced by contact with a catalyst. The waste gas Gs3, which has undergone the denitrification process S33, is released into the atmosphere through a chimney.
[0047] Following the dry separation process S312 and the wet separation process S322, a recovery process S34 is performed. The recovery process S34 includes: a dry recovery process S341, recovering boron-containing dust D from the dry separation unit 312; and a wet recovery process S342, recovering boron from the boron-containing liquid. The recovery equipment 34 includes a solid-liquid separation unit 3421 and a dryer 3422.
[0048] In the dry recovery process S341, for example, the dust D accumulated in the bag filter is brushed off and recovered from an outlet (not shown) located at the bottom of the dry separation unit 312. When brushing off the dust D, methods such as vibration (vibration of the bag filter), backwashing (imparting a reverse airflow), and pulse jet (instantaneous injection of compressed air) can be used. These methods can also be combined. The recovered dust D contains boron.
[0049] In the wet recovery process S342, boron is recovered from the coolant Lc from which boron has been captured by the wet cooling unit 321 and the liquid from which boron has been captured by the wet separation unit 322. Hereinafter, the coolant Lc from which boron has been captured by the wet cooling unit 321 and the liquid from which boron has been captured by the wet separation unit 322 will be collectively referred to as the capturing liquid Lt. The capturing liquid Lt is introduced into the solid-liquid separation unit 3421 and separated into extracted solid Se and waste liquid Lw. Examples of the solid-liquid separation unit 3421 include a filter press, centrifuge, and vacuum filtration, but its type is not particularly limited. The extracted solid Se is introduced into a dryer 3422 and dried to a specified moisture content. Examples of the dryer 3422 include a vacuum dryer, rotary dryer, belt dryer, and spray dryer, but its type is not particularly limited. The dried extracted solid Se contains boron. The waste liquid Lw is treated and discharged by a waste liquid treatment device (not shown).
[0050] In both the dry recovery process S341 and the wet recovery process S342, it is preferable to remove impurities from the dust D or the extraction solid Se and extract boron. For example, if the dust D or the extraction solid Se is mixed with a high-concentration boron solution, the impurities contained in the extraction solid Se dissolve in the high-concentration boron solution, and the boron contained in the extraction solid Se remains as undissolved matter (is extracted). The boron thus recovered is used as a boron source for the glass raw material Gr.
[0051] The glass article manufacturing method described above includes a dry collection step S31, and the glass article manufacturing apparatus includes a dry collection device 31. Therefore, the glass article manufacturing method and apparatus of this embodiment can recover dust from the exhaust gas Gs discharged from the glass melting furnace 1 during the electric heating step S11 in a low-cost and efficient manner. In addition, by performing the dry collection step S31 during the electric heating step S11 and the wet collection step S32 during the combustion heating step S12, the exhaust gas Gs discharged from the glass melting furnace 1 during the combustion heating step S12, which contains a high proportion of water vapor, can be processed without hindrance. Furthermore, for example, if the electric heating step S11 and the dry collection step S31 are performed during operation, and the combustion heating step S12 and the wet collection step S32 are temporarily performed, such as when the melting furnace 1 is started, it is not necessary to use a spray tower or the like all the time as in Patent Document 1. Therefore, the spray tower or the like can be shared with other melting furnaces or the like, or miniaturized, which can reduce operating costs and initial costs.
[0052] It should be noted that the present invention is not limited to the structure of the above-described embodiments, nor is it limited to the effects described above. Various modifications can be made to the present invention without departing from its spirit.
[0053] In the above embodiments, a screw feeder is used to supply glass raw materials to the melting furnace, but it is not limited to this. A vibratory feeder or a pusher can also be used. In addition, multiple feeders can be used instead of just one.
[0054] In the above embodiments, a bag filter is used as a dry separation device, but it is not limited to this. A dry electrostatic precipitator or a ceramic filter may also be used instead of a bag filter.
[0055] In the above embodiment, a wet separation process is performed after the wet cooling process, but it is not limited to this. When the amount of coolant distributed in the wet cooling process is small, all the coolant distributed into the exhaust gas is vaporized. On the other hand, when the amount of coolant distributed is sufficient, a portion of the coolant remains as droplets without vaporization, allowing boron-containing dust to be captured within these droplets. In this case, the dust can be recovered from the exhaust gas without performing the wet separation process.
[0056] In the above embodiments, the waste gas treatment process includes a denitrification process, but is not limited to this. If the concentration of nitrogen oxides in the waste gas is low, a denitrification process may not be necessary.
[0057] In the above embodiments, ammonia is used as a reducing agent in the denitrification process, but it is not limited to this. Ammonia water or urea can also be used instead of ammonia.
[0058] Industrial applicability
[0059] This invention can be suitably used to recover dust from exhaust gases discharged from glass melting furnaces in a low-cost and efficient manner.
[0060] Explanation of reference numerals in the attached figures
[0061] 1. Melting furnace
[0062] 2. Forming device
[0063] 3. Waste gas treatment equipment
[0064] 31 Dry trapping equipment
[0065] 311 Dry cooling unit
[0066] 312 Dry Separation Unit
[0067] 322 Wet Separation Unit
[0068] Gp Glass items
[0069] Gm molten glass
[0070] Gr glass raw materials
[0071] Gs exhaust gas
[0072] Gc cooling gas
[0073] Lc coolant
[0074] S1 Melting Process
[0075] S11 Electric heating process
[0076] S12 Combustion Heating Process
[0077] S2 forming process
[0078] S3 Exhaust Gas Treatment Process
[0079] S31 Dry Collection Process
[0080] S311 Dry cooling process
[0081] S312 Dry Separation Process
[0082] S32 Wet collection process
[0083] S321 Wet cooling process
[0084] S322 Wet Separation Process
[0085] S33 Denitrification Process
[0086] S34 Recycling process.
Claims
1. A method for manufacturing a glass article, comprising: The melting process involves heating the glass raw material in a melting furnace to obtain molten glass; The forming process shapes the molten glass into a glass article; and The waste gas treatment process removes dust from the waste gas discharged from the melting furnace. The method for manufacturing the glass article is characterized by, The melting process includes an electrothermal process, which mainly melts the glass raw material by heating it through electrodes. The waste gas treatment process includes a dry collection process for treating the waste gas discharged from the melting furnace during the electrically heated process. The dry collection process includes a dry cooling process in which cooling gas is mixed with the exhaust gas, and a dry separation process in which the dust is separated from the exhaust gas after the dry cooling process using a dry separation device. The melting process includes at least a combustion heating process in which the glass raw material is melted by combustion heating using a burner. The waste gas treatment process includes a wet capture process for treating the waste gas discharged from the melting furnace during the combustion heating process. The wet collection process includes a wet cooling process in which coolant is distributed into the exhaust gas. The dry collection process is performed while the electric heating process is in progress. The wet collection process is performed during the combustion heating process.
2. The method for manufacturing glass articles according to claim 1, characterized in that, The dry separation device is a bag filter.
3. The method for manufacturing glass articles according to claim 1 or 2, characterized in that, The wet collection process includes a wet separation process that uses a wet separation device to separate the dust from the exhaust gas after the wet cooling process.
4. The method for manufacturing glass articles according to claim 3, characterized in that, The wet separation device is a wet electrostatic precipitator.
5. The method for manufacturing glass articles according to claim 1 or 2, characterized in that, The combustion heating process is performed when the melting furnace is started or restarted.
6. The method for manufacturing glass articles according to claim 1 or 2, characterized in that, The temperature of the exhaust gas after the dry cooling process is below 60°C.
7. The method for manufacturing glass articles according to claim 1 or 2, characterized in that, The volume fraction of water vapor in the exhaust gas discharged from the furnace during the described electric heating process is less than 10%.
8. The method for manufacturing glass articles according to claim 1 or 2, characterized in that, The glass raw material contains boron. The waste gas treatment process includes a boron recovery process for recovering boron from the dust.
9. The method for manufacturing glass articles according to claim 1 or 2, characterized in that, The waste gas treatment process includes a denitrification process that removes nitrification from the waste gas that has undergone the dry collection process or the wet collection process.
10. The method for manufacturing a glass article according to claim 1 or 2, characterized in that, The temperature of the cooling gas is above 15°C.
11. The method for manufacturing a glass article according to claim 10, characterized in that, The cooling gas is heated by waste heat from the melting furnace.
12. An apparatus for manufacturing glass articles, comprising: A melting furnace, which heats glass raw materials to obtain molten glass; A forming apparatus that shapes the molten glass into glass articles; and Waste gas treatment equipment that removes dust from the waste gas discharged from the melting furnace. The apparatus for manufacturing glass articles is characterized in that, In the melting furnace, at least one of the following processes is performed: an electric heating process in which the glass raw material is melted by heating through electrodes, and a combustion heating process in which the glass raw material is melted by heating through a burner. The waste gas treatment equipment includes both dry collection equipment and wet collection equipment. The dry collection equipment includes a dry cooling device for mixing cooling gas into the exhaust gas and a dry separation device for separating the dust from the exhaust gas using a bag filter. In the dry collection device, the waste gas discharged from the melting furnace during the electrically heated process is treated. In the wet scrubbing equipment, the exhaust gas discharged from the melting furnace during the combustion heating process is treated. In the dry collection equipment, the dry collection process is performed during the electric heating process. In the wet collection device, the wet collection process is performed during the combustion heating process.
13. The glass article manufacturing apparatus according to claim 12, characterized in that, The wet collection equipment includes a wet separation device that uses liquid to separate the dust from the exhaust gas.
14. The apparatus for manufacturing glass articles according to claim 12 or 13, characterized in that, The wet collection equipment is shared in multiple of the melting furnaces.