Reduction furnace split-range feeding device convenient to maintain

Abstract

The utility model belongs to the technical field of reduction furnaces, and particularly relates to a reduction furnace split-range feeding device convenient to maintain, which comprises a reduction furnace, an outer ring feeding mechanism and an inner ring feeding mechanism are respectively mounted on a feeding coil pipe of the reduction furnace, and the inner ring feeding mechanism comprises a superheater. A first gas inlet pipe and a liquid discharge pipe are installed on the superheater, the superheater is connected with a first static mixer through a first pipeline, a gas adding pipe is installed on the first static mixer, the first static mixer is connected with an inner ring feeding port of the reduction furnace through a second pipeline, and an exhaust pipe is arranged on the first pipeline. One end of the exhaust pipe is fixed to the first pipeline, the other end of the exhaust pipe is connected to the superheater, and an adjusting valve is arranged on the exhaust pipe. The flow-out of trichlorosilane at different temperatures in the superheater is controlled through the regulating valve arranged on the exhaust pipe, and the feeding temperatures of different feeding pipelines at different operation stages are realized, so that the purposes of eliminating atomization and reducing power consumption are achieved.

Description

Technical Field

[0001] This solution belongs to the field of reduction furnaces, specifically involving a segmented feeding device for reduction furnaces that is easy to maintain. Background Technology

[0002] With the energy crisis and increasing environmental awareness in the 21st century, the development of new energy sources has received widespread attention worldwide. Following the rapid development of the global solar energy industry in 2005, the polysilicon industry, a fundamental raw material for solar energy, has flourished across China. By the end of 2022, the scale of a single polysilicon production line had reached 5 WT / a, with reduction furnaces primarily using multi-pair rods and constant-temperature feeding. Research has shown that low-temperature feeding effectively eliminates atomization, while high-temperature feeding reduces power consumption. Therefore, constant-temperature feeding is not suitable for reduction furnaces at different growth stages. Matching the feeding temperature of different feed nozzles at different operating stages of the reduction furnace can not only effectively eliminate atomization but also reduce power consumption, maximizing profits for the company. Utility Model Content

[0003] The purpose of this solution is to provide a segmented feeding device for a reduction furnace that is easy to maintain, in order to solve the problem of controlling the inner and outer ring feeding temperatures of the reduction furnace at different operating stages in the existing technology.

[0004] To achieve the above objectives, this solution provides a convenient maintenance-friendly multi-stage feeding device for a reduction furnace, comprising a reduction furnace. An outer ring feeding mechanism and an inner ring feeding mechanism are respectively installed on the feeding coil of the reduction furnace. The inner ring feeding mechanism includes a superheater, on which an inlet pipe and a drain pipe are respectively installed. The superheater is connected to a static mixer via a pipe, and an air-adding pipe is installed on the static mixer. The static mixer is connected to the inner ring feed port of the reduction furnace via a pipe. An exhaust pipe is provided on the pipe, with one end fixed to the pipe and the other end connected to the superheater. A regulating valve is provided on the exhaust pipe.

[0005] The principle of this scheme is as follows: During use, independent feeding is achieved through the inner and outer rings of the feed coil. The outer ring feed is supplied by the outer ring feed mechanism, while the inner ring feed is supplied by the inner ring feed mechanism. The outer ring feed mechanism mixes trichlorosilane vapor and hydrogen and introduces it into the outer ring of the feed coil, while the inner ring feed mechanism introduces trichlorosilane vapor into the superheater through the first inlet pipe. After being superheated by the superheater, the trichlorosilane enters the first static mixer, while hydrogen is added to the first static mixer through the gas supply pipe. After the hydrogen and trichlorosilane are fully mixed, they are introduced into the inner ring of the feed coil through the second pipe. During the gas supply process, the flow of trichlorosilane from the superheater to the first static mixer can be controlled by the regulating valve to achieve different feed temperatures for different feed pipelines at different operating stages, thereby eliminating atomization and reducing power consumption.

[0006] The technical advantage of this solution is that by controlling the outflow of trichlorosilane at different temperatures in the superheater through the regulating valve installed on the exhaust pipe, the feed temperature of different feed pipelines at different operating stages can be achieved, thereby eliminating atomization and reducing power consumption.

[0007] Furthermore, the first pipeline is connected to the superheater and the first static mixer via flanges, and both the first air inlet pipe and the first liquid outlet pipe are connected to the superheater via flanges. The flange connections facilitate the disassembly and assembly of the superheater and the first static mixer, and facilitate subsequent maintenance of the superheater and the first static mixer.

[0008] Furthermore, the superheater includes a shell and multiple heat-conducting pipes disposed within the shell. The ends of the heat-conducting pipes are all mounted on support frames, and the other end of the support frames is fixed to the inner wall of the shell. Adjacent heat-conducting pipes are connected by connecting pipes. The exhaust pipe, inlet pipe, and drain pipe are all connected to the heat-conducting pipes. Several spaced-apart heat-conducting plates are installed on the outer wall of the heat-conducting pipes, and heating plates are installed on the inner wall of the shell. The installation of multiple heat-conducting plates on the heat-conducting pipes increases the contact area between the heat-conducting pipes and the hot air inside the shell, allowing more heat to contact the heat-conducting pipes, thereby increasing the rate of steam superheating within the heat-conducting pipes.

[0009] Furthermore, a thermometer is installed on the outer casing, with its end placed inside the casing. A second thermometer is also installed on the outer casing, with its end penetrating the casing and fixed inside the heat-conducting pipe. The temperature inside the outer casing is monitored using the first thermometer, and the steam temperature inside the heat-conducting pipe is monitored using the second thermometer.

[0010] Furthermore, the outer wall of the outer shell is covered with an insulation board, and the outer walls of the exhaust pipe, pipe one, and pipe two are also covered with insulation boards. The insulation boards reduce heat loss during feeding.

[0011] Furthermore, the outer ring feeding mechanism includes a static mixer two, on which inlet pipe two and inlet pipe three are installed. Pipe three is also installed on the static mixer two, with the other end of pipe three installed at the outer ring feed inlet of the reduction furnace. Inlet pipe two, inlet pipe three, and pipe three are connected to the static mixer two via flanges. Trichlorosilane vapor and hydrogen are respectively introduced into the static mixer two through inlet pipe two and inlet pipe three for mixing, and the mixed gas is then introduced into the outer ring of the feed coil on the reduction furnace, thus achieving outer ring feeding of the feed coil.

[0012] Furthermore, a waste discharge pipe is installed on the reduction furnace. Waste gas inside the reduction furnace is discharged through the waste discharge pipe. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0014] Figure 2 This is a schematic diagram of the superheater structure according to an embodiment of the present invention;

[0015] Figure 3 This is a front view of the superheater according to an embodiment of the present utility model;

[0016] Figure 4 This is a schematic diagram of the internal structure of the superheater in an embodiment of this utility model.

[0017] The following detailed explanation illustrates the specific implementation methods:

[0018] The reference numerals in the accompanying drawings of the instruction manual include: 1. Reduction furnace; 2. Outer ring feeding mechanism; 3. Inner ring feeding mechanism; 4. Superheater; 5. Inlet pipe 1; 6. Drain pipe; 7. Exhaust pipe; 8. Pipe 1; 9. Static mixer 1; 10. Gas supply pipe; 11. Pipe 2; 12. Static mixer 2; 13. Inlet pipe 2; 14. Pipe 3; 15. Waste discharge pipe; 16. Regulating valve; 17. Heat conduction pipe; 18. Connecting pipe; 19. Heating plate; 20. Heat conduction plate; 21. Thermometer 1; 22. Thermometer 2; 23. Detailed Implementation

[0019] The basic implementation examples are as follows: Figures 1-4 As shown: A segmented feeding device for a reduction furnace that is easy to maintain includes a reduction furnace 1, on which a waste discharge pipe 16 is installed. Waste gas inside the reduction furnace 1 is discharged through the waste discharge pipe 16. An outer ring feeding mechanism 2 and an inner ring feeding mechanism 3 are respectively installed on the feeding coil of the reduction furnace 1. The inner ring feeding mechanism 3 includes a superheater 4, on which an inlet pipe 5 and a drain pipe 6 are respectively installed. The superheater 4 is connected to a static mixer 9 through a pipe 8. An air supply pipe 10 is installed on the static mixer 9. The static mixer 9 is connected to the inner ring feed port of the reduction furnace 1 through a pipe 11. An exhaust pipe 7 is provided on the pipe 8, with one end of the exhaust pipe 7 fixed to the pipe 8. The other end is connected to the superheater 4, and a regulating valve 17 is installed on the exhaust pipe 7; Pipe 1 8 is connected to the superheater 4 and the static mixer 1 9 through a flange, and the air inlet pipe 1 5 and the liquid outlet pipe 6 are also connected to the superheater 4 through flanges. The flange connection facilitates the disassembly and assembly of the superheater 4 and the static mixer 1 9, and facilitates the subsequent maintenance of the superheater 4 and the static mixer 1 9; The outer wall of the shell is covered with a heat insulation board, and the outer walls of the exhaust pipe 7, the outer walls of pipe 1 8, and the outer walls of pipe 2 11 are also covered with heat insulation boards. The heat insulation boards reduce the heat loss during feeding.

[0020] like Figure 2 , Figure 3 , Figure 4The superheater 4 includes a shell and a plurality of heat-conducting pipes 18 disposed inside the shell. The ends of the heat-conducting pipes 18 are all mounted on a support frame, and the other end of the support frame is fixed to the inner wall of the shell. Adjacent heat-conducting pipes 18 are connected by a connecting pipe 19. The exhaust pipe 7, the inlet pipe 5 and the drain pipe 6 are all connected to the heat-conducting pipes 18. Several spaced heat-conducting plates 21 are installed on the outer wall of the heat-conducting pipes 18, and a heating plate 20 is installed on the inner wall of the shell. By installing multiple heat-conducting plates 21 on the heat-conducting pipe 18, the contact area between the heat-conducting pipe 18 and the hot air inside the shell is increased, allowing more heat to come into contact with the heat-conducting pipe 18, thereby increasing the rate of steam superheating inside the heat-conducting pipe 18. A thermometer 1 22 is installed on the shell, with its end placed inside the shell. A thermometer 23 is also installed on the shell, with its end penetrating the shell and fixed inside the heat-conducting pipe 18. The temperature inside the shell is monitored by the thermometer 1 22, and the steam temperature inside the heat-conducting pipe 18 is monitored by the thermometer 23.

[0021] like Figure 1 As shown, the outer ring feeding mechanism 2 includes a static mixer 2 12, on which an air inlet pipe 2 13 and an air inlet pipe 3 14 are installed. A pipe 3 15 is also installed on the static mixer 2 12. The other end of the pipe 3 15 is installed on the outer ring feed port of the reduction furnace 1. The air inlet pipe 2 13, the air inlet pipe 3 14, and the pipe 3 15 are connected to the static mixer 2 12 through flanges. Trichlorosilane vapor and hydrogen are introduced into the static mixer 2 12 through the air inlet pipe 2 13 and the air inlet pipe 3 14 respectively for mixing. The mixed gas is then introduced into the outer ring of the feed coil on the reduction furnace 1 to realize the outer ring feeding of the feed coil.

[0022] The specific implementation process of this utility model is as follows: In use, the inner and outer rings of the feeding coil are independently fed. The outer ring feeding is supplied by the outer ring feeding mechanism 2, while the inner ring feeding is supplied by the inner ring feeding mechanism 3. The outer ring feeding mechanism 2 mixes trichlorosilane vapor and hydrogen and introduces it into the outer ring of the feeding coil, while the inner ring feeding mechanism 3 introduces trichlorosilane vapor into the superheater 4 through the air inlet pipe 5. After being superheated by the superheater 4, the trichlorosilane enters the static mixer 9, while hydrogen is added to the static mixer 9 through the gas supply pipe 10. After the hydrogen and trichlorosilane are fully mixed, they are introduced into the inner ring of the feeding coil through the pipe 11. During the gas supply process, the flow of trichlorosilane from the superheater 4 to the static mixer 9 can be controlled by the regulating valve 17 to achieve different feeding temperatures for different feeding pipelines at different operating stages, so as to eliminate atomization and reduce power consumption.

[0023] This solution uses a regulating valve 17 installed on the exhaust pipe 7 to control the outflow of trichlorosilane at different temperatures in the superheater 4, thereby achieving different feed temperatures in different feed pipelines at different operating stages, in order to eliminate atomization and reduce power consumption.

[0024] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A segmented feeding device for a reduction furnace that is easy to maintain, comprising a reduction furnace, characterized in that: The feed coil of the reduction furnace is equipped with an outer ring feed mechanism and an inner ring feed mechanism. The inner ring feed mechanism includes a superheater, on which an air inlet pipe and a liquid outlet pipe are installed. The superheater is connected to a static mixer via a pipe, and an air supply pipe is installed on the static mixer. The static mixer is connected to the inner ring feed port of the reduction furnace via a pipe. An exhaust pipe is provided on the pipe, with one end fixed to the pipe and the other end connected to the superheater. A regulating valve is provided on the exhaust pipe.

2. The segmented feeding device for a reduction furnace that is easy to maintain according to claim 1, characterized in that: Pipeline 1 is connected to the superheater and static mixer 1 via flanges, and both the inlet pipe 1 and the outlet pipe are connected to the superheater via flanges.

3. The segmented feeding device for a reduction furnace that is easy to maintain according to claim 1, characterized in that: The superheater includes a shell and a plurality of heat-conducting pipes disposed inside the shell. The ends of the heat-conducting pipes are all mounted on a support frame, and the other end of the support frame is fixed to the inner wall of the shell. Adjacent heat-conducting pipes are connected by connecting pipes. The exhaust pipe, the inlet pipe, and the drain pipe are all connected to the heat-conducting pipes. Several spaced heat-conducting plates are installed on the outer wall of the heat-conducting pipes, and a heating plate is installed on the inner wall of the shell.

4. The segmented feeding device for a reduction furnace that is easy to maintain according to claim 3, characterized in that: The outer casing is provided with a thermometer one, the end of which is placed inside the outer casing. The outer casing is also provided with a thermometer two, the end of which penetrates the outer casing and is fixed inside the heat-conducting pipe.

5. A segmented feeding device for a reduction furnace that is easy to maintain, as described in claim 3, characterized in that: The outer wall of the outer shell is covered with an insulation board, and the outer walls of the exhaust pipe, the first pipe, and the second pipe are also covered with insulation boards.

6. The segmented feeding device for a reduction furnace that is easy to maintain according to claim 1, characterized in that: The outer ring feeding mechanism includes a static mixer two, on which an air inlet pipe two and an air inlet pipe three are installed. A pipe three is also installed on the static mixer two. The other end of the pipe three is installed on the outer ring feeding port of the reduction furnace. The air inlet pipe two, the air inlet pipe three, and the pipe three are connected to the static mixer two through flanges.

7. A segmented feeding device for a reduction furnace that is easy to maintain, as described in claim 1, characterized in that: The reduction furnace is equipped with a waste discharge pipe.

Images