A float glass cooling section pressure relief stack

Abstract

The utility model discloses a kind of float glass cooling part pressure relief chimneys. The utility model is equipped with a flue platform at the left and right side pressure relief port of cooling part respectively, the flue platform is made of steel plate, and bottom has supporting foot. Flue platform is equipped with chimney and flue for connecting chimney and pressure relief port. The top of chimney is equipped with multiple chimney opening adjusting blocks arranged in parallel and scale line, and the opening area size of chimney opening is controlled by the arrangement of chimney opening adjusting block and the marking of scale line. The utility model can accurately control the pressure of cooling part. At the same time, left and right pressure relief port is designed with scale, and left and right symmetrical pressure relief is accurately achieved.

Description

Technical Field

[0001] This utility model belongs to the field of float glass production equipment. Background Technology

[0002] During the production process, the cooling section of a float glass furnace experiences localized pressure fluctuations due to the interaction between the high-temperature molten glass and the cooling air supplied by the dilution fan. These pressure fluctuations lead to instability in the glass flow and internal stress, resulting in uneven annealing stress in the annealing furnace and causing defects such as optical distortion, thus affecting glass quality. Furthermore, excessive pressure in the cooling section can exacerbate the erosion of refractory materials, significantly reducing the furnace's lifespan. The design of the pressure relief vents in the cooling section provides favorable conditions for stabilizing the furnace pressure.

[0003] Currently, most float glass production lines are designed with two pairs of pressure relief ports symmetrically opened upstream and downstream of the cooling section's breast wall. The size of these ports is controlled by either sealing them with clay bricks or installing stainless steel pressure relief sliding doors. However, these methods carry certain risks. First, the pressure relief ports are directly connected to the breast wall, creating a direct connection between the cooling section's internal space and the external environment. When negative pressure occurs inside the furnace, a large amount of contaminants around the pressure relief ports can be drawn into the furnace, affecting glass quality. Second, this method primarily relies on the pressure difference between the inside and outside of the cooling section for pressure relief, resulting in poor efficiency. Third, the conventional opening size of the pressure relief ports can only be estimated, not accurately determined, making it difficult to achieve symmetrical pressure relief.

[0004] CN200410010366.3 discloses a pressure stabilizing device for the cooling section of a float glass melting furnace. A pair of chimneys are installed on each side of the cooling section. Air ducts at the top of the chimneys are connected to fans. The inner wall of the annular air inlet has multiple circumferentially arranged air outlets. A regulating valve for controlling and adjusting the air intake volume and a pressure measuring tube for measuring the furnace pressure are installed. CN202220635630.6 discloses a pressure regulating device for the cooling section of a float glass melting furnace, including a chimney. One end of the chimney is connected to the cooling section of the melting furnace. An air curtain is installed between the two ends of the chimney to create resistance to the airflow inside the chimney. That is, a draft is formed inside the chimney, which changes with the pressure in the cooling section of the melting furnace. To maintain stable furnace pressure, an air curtain is installed between the two ends of the chimney. The air curtain creates resistance to the airflow inside the chimney. This resistance is controllable and stable. When the furnace pressure increases, the amount of gas discharged from the chimney increases; when it decreases, the amount of gas discharged decreases, thereby automatically maintaining a constant pressure in the cooling section of the melting furnace. The above invention has the following shortcomings: 1. The high-velocity, low-temperature air in the air curtain and the high-temperature exhaust gas in the cooling section produce fluidized bodies that condense into the flue. When the dilution fan stops, a negative pressure exists inside the cooling section, which draws the air from the air curtain into the cooling section, causing the condensate in the flue to be drawn into the cooling section and causing pollution. 2. The air curtain is unstable, preventing most of the exhaust gas from being discharged, which affects the cooling efficiency of the dilution air on the glass. Utility Model Content

[0005] The main objective of this invention is to provide a pressure relief chimney for the cooling section of float glass.

[0006] The technical solution of this utility model is as follows:

[0007] A float glass cooling section pressure relief chimney has a flue platform at the left and right pressure relief ports of the cooling section, and a chimney and a flue for connecting the chimney and the pressure relief ports are provided on the flue platform. The top of the chimney has multiple chimney opening adjustment blocks arranged in parallel and scale lines. The multiple chimney opening adjustment blocks are movable, and the size of the chimney opening area is controlled by the different arrangement positions of the chimney opening adjustment blocks on the scale lines.

[0008] Furthermore, the flue platform is made of steel plate and has supporting feet at the bottom.

[0009] Furthermore, the width of the flue is greater than the length of the pressure relief port; the height of the flue is greater than the width of the pressure relief port.

[0010] Furthermore, the chimney opening adjustment block is made of zero-expansion silica brick.

[0011] Furthermore, the thickness of the chimney opening adjustment block is 5~10mm.

[0012] Furthermore, at least one layer of aluminum silicate insulation cotton is laid on the bottom platform of the pressure relief chimney as a heat insulation layer; clay bricks are then laid on top of the insulation cotton as the bottom of the flue.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention enables precise control of the cooling section pressure by adjusting the surface area of ​​the chimney opening adjustment block. Simultaneously, the left and right pressure relief port scale design ensures precise symmetrical pressure relief.

[0015] By designing and constructing pressure relief chimneys on both sides of the cooling section of the float glass melting furnace, a draft is generated at the chimney openings to extract flue gas from inside the cooling section. Compared to traditional pressure relief methods, chimney pressure relief adds the auxiliary draft at the chimney openings, significantly improving the discharge of flue gas.

[0016] This invention greatly reduces the pollution of the cooling section caused by negative pressure air entering the cooling section cavity through the original cooling section pressure relief port. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a partial schematic diagram of the present invention.

[0019] Figure 3 This is a top view of the structure of this utility model.

[0020] In the diagram: 1-Cooling section; 2-Pressure relief port; 3-Fluorite duct; 4-Chimney; 5-Fluorite platform

[0021] 6-Insulation cotton 7-Supporting feet 8-Chimney opening adjustment block 9-Chimney opening 10-Scale line Detailed Implementation

[0022] Example 1

[0023] See Figures 1 to 3 This invention provides a flue platform 5 at the left and right pressure relief ports 2 of the cooling section 1. The flue platform 5 is made of steel plate and has supporting feet 7 at the bottom. The flue platform 5 is equipped with a chimney 4 and a flue 3 for connecting the chimney 4 and the pressure relief port 2. The top of the chimney 4 is provided with multiple chimney opening adjustment blocks 8 arranged in parallel and scale lines 10. The opening area of ​​the chimney opening 9 is controlled by the arrangement of the chimney opening adjustment blocks 8 and the markings on the scale lines.

[0024] Furthermore, the width of the flue 3 is greater than the length of the pressure relief port 2; the height of the flue 3 is greater than the width of the pressure relief port 2.

[0025] The requirements for the flue arch and chimney opening seal are high, specifically: high resistance to corrosion and acid to prevent brick erosion and falling debris; high thermal stability, remaining intact even at long-term high temperatures of 1300℃ and not breaking during disassembly; and low thermal expansion to fit snugly against the chimney and reduce air permeability. In this invention, the chimney opening adjusting block 8 is made of zero-expansion silica brick, which meets the above conditions. The thickness of the chimney opening adjusting block 8 is preferably 5~10mm.

[0026] Furthermore, hot-applied sealant is used to seal the brick joints, ensuring the flue's airtightness and reducing condensation buildup.

[0027] Furthermore, two layers of aluminum silicate insulation cotton 6 are laid on the bottom platform (steel structure panel) of the pressure relief chimney for heat insulation to prevent deformation of the steel structure. A layer of clay bricks is then laid on top of the insulation cotton 6 as the bottom of the flue.

[0028] After implementation of this invention, by adjusting the paving area of ​​the zero-expansion silica bricks, the pressure in the cooling section can be precisely controlled at 0.1 Pa (the reading of the on-site pressure transmitter can be controlled at 0.1 Pa). Simultaneously, the scale design of the left and right pressure relief ports ensures precise symmetrical pressure relief.

[0029] By designing and constructing pressure relief chimneys on both sides of the cooling section of the float glass melting furnace, a draft is generated at the chimney openings to extract flue gas from inside the cooling section. Compared to traditional pressure relief methods, chimney pressure relief adds the auxiliary draft at the chimney openings, significantly improving the discharge of flue gas.

[0030] This invention greatly reduces the pollution of the cooling section caused by negative pressure air entering the cooling section cavity through the original cooling section pressure relief port.

[0031] In practical applications, this invention is used to modify existing production lines. The original crude pressure relief method of opening holes in the cooling section of line 1-1 in the "one kiln, two lines" system resulted in numerous defects of grade 4-5 on the float glass sheets, affecting the selection rate of high-end product orders. After implementing this invention, the number of defects per hour decreased by 50-100. This invention significantly reduces the impact of cooling section contamination on sheet quality.

Claims

1. A pressure relief chimney for the cooling section of float glass, characterized in that, A flue platform is provided at the left and right pressure relief ports of the cooling section. The flue platform is equipped with a chimney and a flue for connecting the chimney and the pressure relief port. The top of the chimney is equipped with multiple chimney opening adjustment blocks arranged in parallel and scale lines. The multiple chimney opening adjustment blocks are movable, and the size of the chimney opening area is controlled by the different arrangement positions of the chimney opening adjustment blocks on the scale lines.

2. The float glass cooling section pressure relief chimney according to claim 1, characterized in that, The flue platform is made of steel plate and has supporting feet at the bottom.

3. The float glass cooling section pressure relief chimney according to claim 1, characterized in that, The width of the flue is greater than the length of the pressure relief port; the height of the flue is greater than the width of the pressure relief port.

4. The float glass cooling section pressure relief chimney according to claim 1, characterized in that, The thickness of the chimney opening adjustment block is 5~10mm.

5. The float glass cooling section pressure relief chimney according to claim 1, characterized in that, The chimney opening adjustment block is made of zero-expansion silica brick.

6. The float glass cooling section pressure relief chimney according to claim 1, characterized in that, At least one layer of aluminum silicate insulation cotton is laid on the bottom platform of the pressure relief chimney as a heat insulation layer; clay bricks are then laid on top of the insulation cotton as the bottom of the flue.

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