CN-121974545-A - Method for improving quality of photovoltaic calendared glass

CN121974545ACN 121974545 ACN121974545 ACN 121974545ACN-121974545-A

Abstract

The invention relates to glass manufacturing technology, in particular to a method for improving the quality of photovoltaic calendared glass, which comprises the steps of controlling the drawing amount of a branch passage unit cross section area when glass liquid flows through the branch passage in a melting furnace, adopting a branch passage side temperature regulating system to reduce the temperature of the branch passage side, controlling the transverse temperature difference delta 1 between the branch passage side and the middle part of the branch passage to be 50-60 ℃, adopting an overflow port temperature and pressure regulating system to reduce the transverse temperature difference delta 2 between the overflow port side and the middle part of the overflow port when the glass liquid flows out from the overflow port, and controlling the atmospheric pressure in the branch passage to be positive. According to the photovoltaic calendaring glass product, the pulling amount is controlled, the lateral temperature difference between the side part of the bypass and the middle part of the bypass is regulated by combining the temperature regulating system of the side part of the bypass, and the atmospheric pressure in the bypass and the lateral temperature difference between the side part of the overflow and the middle part of the overflow are regulated by the temperature and pressure regulating system of the overflow, so that the quality of the photovoltaic calendaring glass product can be improved as a whole.

Inventors

CHEN YAN
GUO WEI
ZHUANG CHUNPENG
ZHANG YANJUAN
TIAN FANG

Assignees

中国洛阳浮法玻璃集团有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260309

Claims (7)

1. A method for improving the quality of photovoltaic calendared glass is characterized by comprising the steps of controlling the pulling amount of a branch passage on a unit cross section area when glass liquid flows through the branch passage in a melting furnace, adopting a branch passage side temperature regulating system to reduce the temperature of the branch passage side, controlling the transverse temperature difference delta 1 between the branch passage side and the middle part of the branch passage to be 50-60 ℃, adopting an overflow port temperature and pressure regulating system to reduce the transverse temperature difference delta 2 between the overflow port side and the middle part of the overflow port when the glass liquid flows out of the overflow port, and controlling the atmospheric pressure in the branch passage to be positive; The overflow port temperature and pressure regulating system comprises a flame blocking brick device, a temperature detecting device and a pressure detecting device, wherein the flame blocking brick device comprises a plurality of flame blocking bricks which are arranged above the overflow port side by side, the upper part of each flame blocking brick is respectively connected with a lifting mechanism, and the lifting mechanisms regulate the transverse temperature difference of glass liquid at the overflow port and the atmospheric pressure in a branch passage by regulating the opening degree of the flame blocking brick.
2. The method for improving the quality of photovoltaic calendared glass according to claim 1, wherein the pulling amount of the branch passage per unit cross-sectional area is controlled by the following method: when the total pulling amount of the branch passage is less than or equal to 200T/D, the pulling amount of the branch passage per unit cross-sectional area is less than or equal to 55T/(D.times.m 2 ); When 200T/D < total drawing amount of branch passage is less than or equal to 300T/D, 55T/(D.times.m 2 ) < drawing amount of branch passage per unit cross-sectional area is less than or equal to 70T/(D.times.m 2 ); when 300T/D < total drawing amount of branch passage is less than or equal to 400T/D, 70T/(D.times.m 2 ) < drawing amount of branch passage per unit cross-sectional area is less than or equal to 80T/(D.times.m 2 ).
3. The method for improving the quality of the photovoltaic calendared glass is characterized in that the branch road side temperature adjusting system comprises a diversion air pipe, a valve and thermocouples, wherein the diversion air pipe is arranged on a breast wall of a branch road in a penetrating mode, an air inlet of the diversion air pipe is arranged outside the branch road and connected with an external cooling air source, an air outlet of the diversion air pipe is arranged above glass liquid at the edge of the branch road, the valve is arranged at the air inlet, the thermocouples are arranged at the crown of the branch road, three thermocouples are in a group, thermocouples in the same group are transversely distributed above the glass liquid of the branch road at intervals, and the heights of the thermocouples from the glass liquid are consistent.
4. The method for improving the quality of the photovoltaic calendared glass according to claim 3, wherein the bypass roadside temperature regulation system is controlled by increasing the valve opening on the diversion pipe when the temperature difference is less than 50 ℃ and decreasing the valve opening on the diversion pipe when the temperature difference is greater than 60 ℃.
5. The method for improving the quality of the photovoltaic calendared glass according to claim 1, wherein the pressure detection device consists of a pressure taking pipe and a pressure gauge, the pressure taking pipe is arranged at the breast wall of the branch passage and is communicated with the inside of the branch passage through a through hole in the breast wall, and the pressure taking pipe is connected with the pressure gauge and is used for detecting the change of the pressure in the branch passage after the cooling air flow is introduced.
6. The method for improving the quality of the photovoltaic rolled glass according to claim 1, wherein the temperature detection device comprises two groups of infrared thermal imaging systems, lens ends of the two groups of infrared thermal imaging systems are respectively arranged at two sides of the overflow port, display ends of the two groups of infrared thermal imaging systems are respectively arranged in the control room, and each group of infrared thermal imaging systems respectively monitors multi-point glass liquid temperature data at the half-width overflow port.
7. The method for improving the quality of the photovoltaic calendared glass according to claim 1, wherein the control method of the overflow port temperature and pressure regulating system is characterized by comprising the following steps of firstly regulating the height of each flame shielding brick according to temperature information detected by a temperature detection device to enable the transverse temperature difference between the edge of the overflow port and the middle of the overflow port to meet the requirements, secondly detecting the atmospheric pressure in a branch passage, and reducing the overall height of the flame shielding brick device if the atmospheric pressure in the branch passage is negative.

Description

Method for improving quality of photovoltaic calendared glass Technical Field The invention relates to glass manufacturing technology, in particular to a method for improving the quality of photovoltaic calendared glass. Background The photovoltaic rolled glass is one of flat glass, and is named as rolled glass for a cover plate and a back plate of a photovoltaic cell assembly because the forming method is to press and extend between an upper roller and a lower roller of a calender. In the current production of photovoltaic calendared glass, the melting furnace scale is increasingly large and is basically more than 1000T/D because of the requirements of energy conservation and consumption reduction. One forming line is difficult to digest the amount of molten glass in a large-sized melting furnace, and needs to be divided into a plurality of branch lines at forming positions for forming the molten glass to prepare photovoltaic glass products. This division into a plurality of branches is usually carried out in the form of branch paths. The molten glass enters the neck from the melting part, then enters the transverse passage and then enters the branch passages, and the outlet end of each branch passage is connected with a calender for molding. Although the glass liquid in the large-tonnage melting furnace is successfully split and molded in this way, the width of the corresponding branch passage is limited and is often less than 4.5m because the influence of infinite expansion of the calendaring rollers is not realized. The large size of the furnace and the limited width of the branch passages results in a large single branch passage pull and a high flow rate of molten glass, so that a large portion of the molten glass at the edge of each branch passage in contact with the refractory material enters the forming flow. The glass liquid at the edge is inconsistent with the main flow glass liquid in terms of thermal uniformity and chemical uniformity due to contact with the refractory material of the tank wall, and the glass liquid is easy to contain defects such as bubbles and stones, and the overall quality of the glass liquid is reduced after the glass liquid is mixed into the main flow glass liquid. Disclosure of Invention Aiming at the problems of the background technology, the invention aims to provide a method for improving the quality of photovoltaic rolled glass, which aims to solve the problem of the quality reduction of the photovoltaic rolled glass caused by glass liquid at the edge of a branch passage. In order to achieve the above purpose, the present invention adopts the following technical scheme: A method for improving the quality of photovoltaic calendared glass comprises controlling the pulling amount of a branch passage unit cross section area when glass liquid flows through the branch passage in a melting furnace, adopting a branch passage side temperature regulating system to reduce the temperature of the branch passage side, controlling the transverse temperature difference delta 1 between the branch passage side and the middle part of the branch passage to be 50-60 ℃, adopting an overflow port temperature and pressure regulating system to reduce the transverse temperature difference delta 2 between the overflow port side and the middle part of the overflow port when the glass liquid flows out from the overflow port, and controlling the atmospheric pressure in the branch passage to be a positive value; The overflow port temperature and pressure regulating system comprises a flame blocking brick device, a temperature detecting device and a pressure detecting device, wherein the flame blocking brick device comprises a plurality of flame blocking bricks which are arranged above the overflow port side by side, the upper part of each flame blocking brick is respectively connected with a lifting mechanism, and the lifting mechanisms regulate the transverse temperature difference of glass liquid at the overflow port and the atmospheric pressure in a branch passage by regulating the opening degree of the flame blocking brick. The pulling amount of the branch passage on the unit cross-sectional area is controlled by the following method, and the method is as follows: when the total pulling amount of the branch passage is less than or equal to 200T/D, the pulling amount of the branch passage per unit cross-sectional area is less than or equal to 55T/(D.times.m 2); When 200T/D < total drawing amount of branch passage is less than or equal to 300T/D, 55T/(D.times.m 2) < drawing amount of branch passage per unit cross-sectional area is less than or equal to 70T/(D.times.m 2); when 300T/D < total drawing amount of branch passage is less than or equal to 400T/D, 70T/(D.times.m 2) < drawing amount of branch passage per unit cross-sectional area is less than or equal to 80T/(D.times.m 2). The branch road side temperature regulating system comprises a flow guide air pipe, a valve and thermocouples, wherein