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CN-122015497-A - Flame path for aluminum electrolysis prebaked anode roasting furnace

CN122015497ACN 122015497 ACN122015497 ACN 122015497ACN-122015497-A

Abstract

The invention discloses a flame path for an aluminum electrolysis prebaked anode roasting furnace, which relates to the technical field of the flame path of a roasting furnace, and comprises a flame path box and five flame path walls arranged in the flame path box, wherein a plurality of channels are formed by surrounding the flame path walls, the inner wall of the flame path box and the adjacent flame path walls, the inlet end and the outlet end of each channel are respectively provided with a shrinkage part, the middle part of each channel is provided with a widening part, and the length and the width of each widening part are both larger than those of the shrinkage parts. The invention adopts a variable cross-section structure with two ends of the shrinkage mouth and a widened middle part and gradually increased along the width of a flow path, when the flue gas flows, the shrinkage mouth part forms a throttling effect, the flow speed of the flue gas is improved, the flow loss of the flue gas along the path is compensated, the too low flow speed of a tail section channel is avoided, the widened middle part provides sufficient heat exchange space, and the flue gas and carbon blocks are ensured to fully exchange heat.

Inventors

  • ZHAI CHUNQUAN
  • ZHAI XIAOFENG

Assignees

  • 德州永兴碳素有限公司

Dates

Publication Date
20260512
Application Date
20260407

Claims (8)

  1. 1. The utility model provides an aluminium electroloysis prebaked anode roasting fire way for stove, includes fire way case (1) and sets up in five fire way walls (2) of fire way case (1) inside, enclose between fire way wall (2) and fire way case (1) inner wall and adjacent fire way wall (2) and form a plurality of passageway (3), its characterized in that: The inlet end and the outlet end of each channel (3) are respectively provided with a shrinkage part (301), the middle part of each channel (3) is provided with a widening part (302), and the length and the width of the widening part (302) are respectively larger than those of the shrinkage parts (301); along the flue gas flow path, the width of the necking part (301) and the widening part (302) of each channel (3) presents increasing trend; Transition parts (303) are arranged at the joint positions of the adjacent channels (3), and the radian radiuses of the transition parts (303) in the channels (3) are sequentially increased along the smoke flow path.
  2. 2. The flame path for the aluminum electrolysis prebaked anode roasting furnace of claim 1, wherein each channel (3) is internally provided with a flow guide component, the flow guide components comprise flow blocking units and driving components which are positioned on two side walls of the channel (3), and the two flow blocking units are symmetrically arranged about the channel (3); the flow blocking unit comprises a plurality of flow blocking sheets (4) which are vertically distributed and rotatably assembled on the inner wall of the widening part (302); when the flame path box (1) is in a heating stage, the driving assembly is used for enabling the flow baffle (4) to keep a state approaching to the vertical smoke flow direction.
  3. 3. A flame path for an aluminum electrolysis prebaked anode baking furnace according to claim 2, wherein the driving assembly is used for keeping the baffle plate (4) in a vertical state when the flame path box (1) is in a constant temperature stage.
  4. 4. The flame path for the aluminum electrolysis prebaked anode roasting furnace according to claim 3, wherein when the flame path box (1) is in a cooling stage, the driving assembly is used for driving the flow blocking sheets (4) on the same side to rotate in the same direction, the rotation angle of each flow blocking sheet (4) from top to bottom is in a decreasing or increasing trend, and the flow blocking sheet (4) on the other side and the side flow blocking sheet (4) are reversely rotated and the angle is in a reverse progressive trend.
  5. 5. The flame path for an aluminum electrolysis prebaked anode roasting furnace according to claim 4, wherein the baffle plate (4) is arc-shaped.
  6. 6. The flame path for the aluminum electrolysis prebaked anode roasting furnace according to claim 5, wherein the driving assembly comprises a linear driving unit and a transmission unit, the linear driving unit comprises a deflector rod (5) fixedly connected with each flow baffle plate (4) in the channel (3), a driving block (6) is correspondingly arranged below each deflector rod (5), each driving block (6) is assembled on a driving frame (7), the driving frames (7) are in sliding fit with the side wall of the flame path box (1), a torsion spring I (8) is sleeved on a rotating shaft of each deflector rod (5), and a screw rod (9) is connected to the driving frames (7) in a threaded manner; The transmission unit is used for driving the flow baffle (4) to complete corresponding angle rotation in the cooling stage.
  7. 7. The flame path for the aluminum electrolysis prebaked anode roasting furnace of claim 6, wherein the transmission unit comprises pressure rods (10) corresponding to each deflector rod (5) one by one, the pressure rods (10) are positioned on one side of the deflector rods (5) close to the smoke flow direction, each pressure rod (10) is rotationally connected with the side wall of the flame path box (1), a torsion spring II (11) is sleeved on the rotating shaft of each pressure rod (10), a push rod (12) is fixedly connected to each pressure rod (10), the push rods (12) and the pressure rods (10) are obliquely arranged, and a preset gap is reserved between the top ends of the push rods (12) and the bottoms of the deflector rods (5); In the two flow blocking units, a top rod (12) correspondingly matched with one side flow blocking sheet (4) gradually increases from top to bottom, and a top rod (12) correspondingly matched with the other side flow blocking sheet (4) gradually decreases from top to bottom.
  8. 8. The flame path for the aluminum electrolysis prebaked anode roasting furnace of claim 1, wherein the driving block (6) and the driving frame (7) are elastically and slidably connected, one side of each deflector rod (5) in the rotating direction is provided with a limiting block (13), the limiting blocks (13) are slidably matched with the side wall of the flame path box (1), a screw (14) penetrates through the upper thread of each limiting block (13), and the screw (14) is rotatably connected with the side wall of the flame path box (1).

Description

Flame path for aluminum electrolysis prebaked anode roasting furnace Technical Field The invention relates to the technical field of roasting furnace flame paths, in particular to a flame path for an aluminum electrolysis prebaked anode roasting furnace. Background The flame path for baking the traditional carbon blocks is of a straight barrel type structure with uniform cross section, the inner diameter of a channel is kept consistent along the flowing direction of the flue gas, the width of the channel is unchanged in the whole course, when the flue gas flows in an S shape in the flame path, the inherent defects of air flow characteristics and heat transfer are easy to cause poor baking uniformity of the carbon blocks, the problems of insufficient local maturity and local overbaking occur, and the core defects are expressed in the following two aspects: 1. The flue gas decays along Cheng Liusu, the temperature suddenly drops, and the heat transfer efficiency gradient is unbalanced: The flue gas enters the first section of flame path, the initial flow velocity is high, the carried high temperature can rapidly complete heat exchange with the carbon blocks, but in the S-shaped flow process, the flue gas needs to continuously overcome the friction resistance of the wall surface of the channel, flow loss is generated at the upper and lower corners due to the turning of the flow channel, the flow velocity gradually decays along the path, the flow velocity is only 1/4 of the initial flow velocity when the flue gas flows through the second section of flame path, meanwhile, the flue gas releases part of heat after completing heat exchange in each section of flame path, the temperature continuously decreases along with the flow process, the temperature is lower than the initial temperature when the flue gas flows through the second section of flame path, the heat output capacity is greatly reduced, and finally, the rising rate of the carbon blocks at the front section of the flame path is high, the rising rate of the carbon blocks at the rear section of the flame path is slow, and the baking progress difference is obvious. 2. Airflow vortex is easy to form at the turning part of the flame path, and the local thermal field is unevenly distributed: When flue gas flows at the corners of the upper end and the lower end of the flame path, the constant-section straight cylinder structure has no special air flow guiding design, can not form effective constraint and guide on steering air flow, is easy to form a detained vortex in a corner area, and partial flue gas can not continuously flow forwards when turning at the corner area, so that heat is locally accumulated at the corner, obvious temperature difference is formed at the upper section and the lower section of the flame path, and the problems of partial baking imperviousness and partial overdrawing of carbon blocks in corresponding areas occur due to uneven heating. Based on the above, the invention designs a flame path for an aluminum electrolysis prebaked anode roasting furnace to solve the problems. Disclosure of Invention The invention aims to provide a flame path for an aluminum electrolysis prebaked anode roasting furnace, which aims to solve the problems in the background technology. The fire channel for the aluminum electrolysis prebaked anode roasting furnace comprises a fire channel box and five fire channel walls arranged in the fire channel box, wherein the fire channel walls, the inner wall of the fire channel box and adjacent fire channel walls are enclosed to form a plurality of channels; The inlet end and the outlet end of each channel are respectively provided with a shrinkage part, the middle part of each channel is provided with a widening part, and the length and the width of the widening part are both larger than those of the shrinkage parts; along the flue gas circulation path, the width of the shrinkage part and the width of the widening part of each channel are in an increasing trend; The joint of the adjacent channels is provided with transition parts, and the radian radius of each transition part in each channel is gradually increased along the smoke flow path. As a further scheme of the invention, a flow guide assembly is arranged in each channel, the flow guide assembly comprises flow blocking units and a driving assembly, which are positioned on two side walls of the channel, and the two flow blocking units are symmetrically arranged about the channel; the flow blocking unit comprises a plurality of flow blocking sheets which are vertically distributed and rotatably assembled on the inner wall of the widening part; When the flame path box is in a heating stage, the driving assembly is used for enabling the flow baffle to keep a state approaching to the vertical smoke flow direction. As a further aspect of the present invention, the driving assembly is used to keep the baffle plate in a vertical state when the fire box is in a constant te