High-efficiency flue gas collecting device for ladle mouth of industrial silicon table

Abstract

The utility model discloses an efficient flue gas collecting device for an industrial silicon table ladle opening, which relates to the technical field of flue gas collection and comprises a frustum-shaped flue gas hood, a horizontal connecting pipeline, a table ladle opening, a channel steel support frame and a dust removal main pipeline interface, and the frustum-shaped flue gas hood is mounted above the table ladle opening to form a tapered flow channel for guiding flue gas to rise; the left surface of the horizontal connecting pipeline is fixedly connected with an elbow, the elbow and the horizontal connecting pipeline with a specific section are adopted, local eddy current loss is reduced, efficient flue gas collection is achieved, meanwhile, energy consumption is reduced, the device can extend and expand a smoke hood array along with a ladle track, the device can flexibly adapt to smelting workshops of different scales and layouts, and the device is suitable for popularization and application. The requirement for industrial production scale change is met, good universality and expansibility are achieved, the inner wall of the frustum-shaped smoke hood is sprayed with the aluminum oxide-based ceramic coating, the smoke hood can be effectively protected, the horizontal connecting pipeline is wrapped with the aluminum silicate heat preservation cotton, heat loss is reduced, and the energy utilization rate is further increased.

Description

Technical Field

[0001] This utility model relates to the field of flue gas collection technology, and in particular to an efficient flue gas collection device for industrial silicon wafers. Background Technology

[0002] The high-efficiency collection device for industrial silicon ladle fumes is a key environmental protection equipment in industrial silicon smelting workshops, designed to solve the problem of capturing dust-laden fumes escaping from the ladle vents during the transport of molten silicon. In the industrial silicon refining process, high-temperature molten silicon continuously releases large amounts of dust-laden fumes from the ladle vents during ladle transfer. Effective treatment of these fumes is crucial for ensuring workshop environmental quality, operator health, and the sustainable development of the enterprise.

[0003] In practical applications, industrial silicon smelting workshops typically include the following main components:

[0004] 1. The tray is used to hold high-temperature molten silicon. Its structure must have good high-temperature resistance and heat preservation properties to ensure the stability of the silicon during the transfer process.

[0005] 2. The workshop ventilation system is responsible for maintaining air circulation in the workshop and preventing the accumulation of harmful gases. However, traditional ventilation systems have limited ability to specifically capture flue gas from the packaging machine.

[0006] 3. Dust removal equipment is used to purify the collected flue gas and remove pollutants such as dust to meet environmental emission standards, but it is not efficient in collecting flue gas.

[0007] Currently, various methods have been adopted in the industry to address the issue of fume collection at packaging machine inlets. Some companies use simple cylindrical fume hoods, attempting to collect the fumes through natural ventilation or small fans. Others are trying to install large exhaust systems on the roof of the workshop, relying on their high suction power to cover the packaging machine area. Additionally, some companies have erected barriers around the packaging machines to reduce the spread of fumes before collection.

[0008] However, the aforementioned existing technologies still have many problems. In terms of collection efficiency, the traditional straight-cylinder fume hood has a low collection rate and cannot effectively collect most of the escaping flue gas, resulting in smoke and dust filling the workshop and reducing visibility. This not only affects production operations but also threatens the health of operators. In terms of system resistance, existing collection methods often lack optimization of pipeline layout and fume hood structure, resulting in large overall pressure loss and high energy consumption, which is not conducive to energy conservation and emission reduction for enterprises. In terms of adaptability, existing collection devices are difficult to flexibly expand according to changes in the ladle track in the workshop, and cannot meet the needs of smelting workshops of different sizes and layouts, thus limiting their application in actual production. To address these problems, this application proposes a solution: designing a high-efficiency collection device for industrial silicon ladle inlet flue gas. This device achieves low-resistance and high-efficiency collection of high-temperature flue gas by optimizing the geometry of the fume hood and the pipeline connection method, and has advantages such as high collection efficiency, low system resistance, and strong adaptability. Utility Model Content

[0009] To address the shortcomings of existing technologies, this utility model provides an efficient collection device for industrial silicon wafer fume hoods. It solves the problems of low collection rate of traditional straight-cylinder fume hoods, which cannot effectively collect most of the escaping fumes, resulting in smoke and dust filling the workshop and reduced visibility. This not only affects production operations but also threatens the health of operators. In terms of system resistance, existing collection methods often lack optimization of pipeline layout and fume hood structure, resulting in large overall pressure loss and high energy consumption.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] An efficient flue gas collection device for industrial silicon wafer hoods includes a frustum-shaped fume hood, a horizontal connecting pipe, a wafer hood opening, a channel steel support frame, and a dust removal main pipe interface. The frustum-shaped fume hood is installed above the wafer hood opening, forming a gradually narrowing flow channel to guide the flue gas upward. An elbow is fixedly connected to the left surface of the horizontal connecting pipe, and the elbow is fixedly connected to the frustum-shaped fume hood. The channel steel support frame consists of two pairs of No. 10 channel steels symmetrically distributed at the four corners of the frustum-shaped fume hood. The dust removal main pipe interface is located at the end of the horizontal connecting pipe. A workshop central dust removal system is installed on the right side of the horizontal connecting pipe, and the workshop central dust removal system is connected to the dust removal main pipe interface. The vertical distance between the lower opening of the frustum-shaped fume hood and the wafer hood opening is controlled at 0.3-0.5m.

[0012] Preferably, the top of the channel steel support frame is connected to the anchor bolts pre-embedded in the workshop ceiling through elastic shock-absorbing pads, and the bolt torque is set to 200 N·m. The flange interface between the top of the frustum-shaped fume hood and the horizontal connecting pipe is sealed with a graphite spiral wound gasket.

[0013] Preferably, the inner wall of the frustum-shaped fume hood is coated with an alumina-based ceramic coating with a thickness of 1.2mm, which can withstand a temperature of ≥800℃, and the horizontal connecting pipe is wrapped with aluminum silicate insulation cotton.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Through the tapered flow channel design of the frustum-shaped fume hood, an accelerated upward effect of flue gas is formed, with a measured flue gas capture rate of ≥92%, which is significantly improved compared to the capture rate of ≤70% of the traditional straight-cylinder fume hood. This can more effectively reduce smoke and dust pollution in the workshop and improve the air quality of the workshop. The use of a large curvature elbow with R=450mm and a horizontal connecting pipe with a specific cross-section reduces local eddy current loss, resulting in an overall pressure loss of ≤800Pa and a reduction in energy consumption of more than 20%. While achieving efficient flue gas collection, energy consumption is reduced and production costs are saved.

[0016] 2. This device can extend and expand the fume hood array along the platform track, flexibly adapting to smelting workshops of different sizes and layouts, meeting the needs of changes in industrial production scale, and has good versatility and expandability. The inner wall of the frustum-shaped fume hood is sprayed with a 1.2mm thick alumina-based ceramic coating, which can withstand temperatures ≥800℃, effectively protecting the fume hood and extending its service life. The horizontal connecting pipes are wrapped with aluminum silicate insulation cotton to reduce heat loss and further improve energy utilization. Attached Figure Description

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0018] Figure 1 This is an overall structural diagram of the present invention;

[0019] Figure 2 This is a structural diagram of the frustum-shaped fume hood of this utility model;

[0020] Figure 3 This is a structural diagram of the horizontal connecting pipe of this utility model.

[0021] Legend: 1. Frustum hood; 2. Dust trap opening; 4. Channel steel support frame; 7. Elbow; 8. Horizontal connecting pipe; 10. Central dust removal system for workshop. Detailed Implementation

[0022] This application provides an efficient industrial silicon wafer fume collection device that effectively solves the problems of low collection rate of traditional straight-cylinder fume hoods, which cannot effectively collect most of the escaping flue gas, resulting in smoke and dust filling the workshop and reducing visibility. This not only affects production operations but also threatens the health of operators. In terms of system resistance, existing collection methods often lack optimization of pipeline layout and fume hood structure, resulting in large overall pressure loss and high energy consumption. This application designs an efficient industrial silicon wafer fume collection device that optimizes the geometry of the fume hood and the pipeline connection method to achieve low-resistance and efficient collection of high-temperature flue gas. It has advantages such as high collection efficiency, low system resistance, and strong adaptability.

[0023] Example

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, the technical solution in this application embodiment effectively solves the problems of low collection rate of traditional straight-cylinder fume hoods, which cannot effectively collect most of the escaping smoke, resulting in smoke and dust filling the workshop and reduced visibility. This not only affects production operations but also threatens the health of operators. In terms of system resistance, existing collection methods often lack optimization of pipeline layout and fume hood structure, resulting in large overall pressure loss and high energy consumption. The overall approach is as follows:

[0025] To address the problems existing in the prior art, this utility model provides a high-efficiency collection device for industrial silicon wafer hood flue gas, including a frustum-shaped fume hood 1, a horizontal connecting pipe 8, a wafer hood 2, a channel steel support frame 4, and a dust removal main pipe interface. The frustum-shaped fume hood 1 is installed above the wafer hood 2, forming a gradually narrowing flow channel to guide the flue gas upward. An elbow 7 is fixedly connected to the left surface of the horizontal connecting pipe 8, and the elbow 7 is fixedly connected to the frustum-shaped fume hood 1. The channel steel support frame 4 uses two pairs of No. 10 channel steels symmetrically distributed at the four corners of the frustum-shaped fume hood 1. The dust removal main pipe interface is connected to... The outlet is located at the end of the horizontal connecting pipe 8. A central dust removal system 10 is installed on the right side of the horizontal connecting pipe 8. The central dust removal system 10 is connected to the main dust removal pipe interface. The vertical distance between the lower opening of the frustum-shaped fume hood 1 and the ladle opening 2 is controlled at 0.3-0.5m. In industrial silicon refining, when the ladle transports molten silicon, its high temperature causes dust-laden fumes to continuously escape from the ladle opening 2. At this time, the frustum-shaped fume hood 1 plays a crucial role. Its lower opening size is 2.5m × 2.5m, its upper opening size is 1.1m × 1.1m, and its four sides... The 2m long hypotenuse has its lower opening directly above the 2-meter-high platform, with a vertical spacing of 0.3-0.5m, covering the diffusion range of the molten silicon fumes. The tapered flow channel design on the four sides of the truncated cone-shaped fume hood 1 allows the fumes to rise naturally and accelerate from the lower opening. The fumes then enter a horizontal connecting pipe 8 connected to the top of the fume hood. The horizontal connecting pipe 8 has a cross-section of 300mm × 600mm and connects to the top of the truncated cone-shaped fume hood 1 via a 450mm (R=450mm) elbow 7 (1.5 times the pipe width). This large-curvature elbow 7 can reduce... With low local resistance, the horizontal connecting pipe 8 is connected to the central dust removal system 10 in the workshop. After startup, the system forms a negative pressure with a negative pressure value ≥-500Pa (monitored by a pressure gauge). Under the negative pressure suction, the flue gas is effectively collected and enters the dust removal system for treatment. Through the tapered flow channel design of the frustum-shaped fume hood 1, an accelerated upward effect of the flue gas is formed. The measured flue gas capture rate is ≥92%, which is significantly improved compared to the traditional straight-cylinder fume hood capture rate ≤70%. This can more effectively reduce smoke and dust pollution in the workshop and improve the air quality in the workshop.

[0026] The top of the channel steel support frame 4 is connected to the anchor bolts pre-embedded in the workshop ceiling via elastic damping pads. The bolt torque is set to 200 N·m. The flange interface between the top of the frustum-shaped fume hood 1 and the horizontal connecting pipe 8 is sealed with a graphite spiral wound gasket. The inner wall of the frustum-shaped fume hood 1 is coated with a 1.2 mm thick alumina-based ceramic coating, withstanding temperatures ≥800℃. The horizontal connecting pipe 8 is wrapped with aluminum silicate insulation cotton. The use of a large curvature elbow 7 with R=450 mm and a specific cross-section of the horizontal connecting pipe 8 reduces local eddy current losses, resulting in an overall pressure loss ≤800 Pa and energy consumption. Reducing emissions by more than 20%, this device achieves efficient flue gas collection while lowering energy consumption and saving production costs. The fume hood array can be extended along the platform track, flexibly adapting to smelting workshops of different sizes and layouts to meet the needs of varying industrial production scales. It possesses excellent versatility and expandability. The inner wall of the frustum-shaped fume hood 1 is coated with a 1.2mm thick alumina-based ceramic coating, withstanding temperatures ≥800℃, effectively protecting the fume hood and extending its service life. The horizontal connecting pipe 8 is wrapped with aluminum silicate insulation cotton to reduce heat loss and further improve energy utilization.

[0027] Working principle:

[0028] In industrial silicon refining, when molten silicon is transported in a ladle, its high temperature causes dust-laden fumes to continuously escape from the ladle opening 2. At this time, the frustum-shaped fume hood 1 plays a crucial role. It has a lower opening of 2.5m × 2.5m, an upper opening of 1.1m × 1.1m, and four 2m long inclined sides. The lower opening faces directly above the ladle opening 2, with vertical spacing maintained at 0.3-0.5m, effectively covering the diffusion range of the molten silicon fumes. The gradually narrowing flow channel design of the four inclined sides of the frustum-shaped fume hood 1 allows the fumes to rise naturally from the lower opening. Then, the flue gas accelerates and enters the horizontal connecting pipe 8, which is connected to the top of the fume hood. The horizontal connecting pipe 8 has a cross-section of 300mm × 600mm and is connected to the top of the frustum-shaped fume hood 1 through a 450mm bend 7 (1.5 times the pipe width). This large curvature bend 7 can reduce local resistance. The end of the horizontal connecting pipe 8 is connected to the central dust removal system 10 in the workshop. After startup, the system forms a negative pressure with a negative pressure value ≥ -500Pa (monitored by a pressure gauge). Under the action of negative pressure suction, the flue gas is effectively collected and enters the system. The dust removal system utilizes a conical fume hood 1 with a tapered flow channel design to create an accelerated upward flow effect for the flue gas. The measured flue gas capture rate is ≥92%, a significant improvement compared to the traditional straight-cylinder fume hood's capture rate of ≤70%. This effectively reduces dust pollution in the workshop and improves air quality. The use of a large-curvature elbow 7 (R=450mm) and a horizontal connecting pipe 8 with a specific cross-section reduces local eddy current losses, resulting in an overall pressure loss of ≤800Pa and a reduction in energy consumption of over 20%. While achieving efficient flue gas collection, this system reduces energy consumption and saves production costs. The fume hood array can be extended along the platform track, flexibly adapting to smelting workshops of different sizes and layouts to meet the needs of varying industrial production scales. It exhibits excellent versatility and expandability. The inner wall of the conical fume hood 1 is coated with a 1.2mm thick alumina-based ceramic coating, withstanding temperatures ≥800℃, effectively protecting the fume hood and extending its service life. The horizontal connecting pipe 8 is wrapped with aluminum silicate insulation cotton to reduce heat loss and further improve energy utilization.

[0029] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A high-efficiency collection device for flue gas from an industrial silicon wafer packaging port, characterized in that, It includes a frustum-shaped fume hood (1), a horizontal connecting pipe (8), a platform opening (2), a channel steel support frame (4), and a dust removal main pipe interface; the frustum-shaped fume hood (1) is installed above the platform opening (2) to form a gradually narrowing flow channel that guides the flue gas to rise, and an elbow (7) is fixedly connected to the left surface of the horizontal connecting pipe (8); The elbow (7) is fixedly connected to the frustum hood (1), the channel steel support frame (4) uses two pairs of No. 10 channel steels and is symmetrically distributed at the four corners of the frustum hood (1), the dust removal main pipe interface is set at the end of the horizontal connecting pipe (8), the workshop central dust removal system (10) is set on the right side of the horizontal connecting pipe (8), and the workshop central dust removal system (10) is connected to the dust removal main pipe interface.

2. The industrial silicon wafer fume collection device as described in claim 1, characterized in that: The vertical distance between the lower opening of the frustum-shaped smoke hood (1) and the opening of the hood (2) is controlled at 0.3-0.5m.

3. The industrial silicon wafer fume collection device as described in claim 1, characterized in that: The top of the channel steel support frame (4) is connected to the anchor bolts pre-embedded in the workshop ceiling through elastic shock-absorbing pads, and the bolt torque is set to 200 N·m.

4. The industrial silicon wafer fume collection device as described in claim 1, characterized in that: The flange interface between the top of the frustum hood (1) and the horizontal connecting pipe (8) is sealed with a graphite spiral wound gasket.

5. The industrial silicon wafer fume collection device as described in claim 1, characterized in that: The inner wall of the frustum-shaped fume hood (1) is coated with an alumina-based ceramic coating with a thickness of 1.2 mm, which can withstand temperatures ≥800℃.

6. The industrial silicon wafer fume collection device as described in claim 1, characterized in that: The horizontal connecting pipe (8) is wrapped with aluminum silicate insulation cotton.

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