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CN-121977218-A - Structure for preventing smoke from flowing back

CN121977218ACN 121977218 ACN121977218 ACN 121977218ACN-121977218-A

Abstract

The application relates to the technical field of boilers and discloses a structure for preventing smoke from flowing backwards, which comprises that when the blowing power of smoke in an outlet flue of a first boiler induced draft fan is larger than that of smoke in an outlet flue of a second boiler induced draft fan, an inner balance bar rotates, a first upper guide plate and a first lower guide plate guide the smoke in the outlet flue of the first boiler induced draft fan upwards, and a second upper guide plate and a second lower guide plate guide the smoke in the outlet flue of the second boiler induced draft fan horizontally; when the blowing power of the flue gas of the first boiler induced draft fan outlet flue is smaller than that of the second boiler induced draft fan outlet flue, the inner balance rod rotates, the first upper guide plate and the first lower guide plate horizontally guide the flue gas of the first boiler induced draft fan outlet flue, and the second upper guide plate and the second lower guide plate guide the flue gas of the second boiler induced draft fan outlet flue upwards. The application changes the flow guide angles of the first upper flow guide plate, the first lower flow guide plate, the second upper flow guide plate and the second lower flow guide plate by utilizing the impact force of the smoke flow, thereby avoiding the back flow of the smoke.

Inventors

  • WANG QUN
  • XIE JIANFU
  • WANG DERUI

Assignees

  • 呼伦贝尔安泰热电有限责任公司海拉尔热电厂

Dates

Publication Date
20260505
Application Date
20260204

Claims (10)

  1. 1. A structure for preventing smoke from flowing back, comprising: The inner balance rod (1) is positioned in the main flue (2), the middle of the inner balance rod (1) is rotationally connected to the wall surface of the main flue (2), the main flue (2) is arranged in the vertical direction, flue gas is conveyed upwards along the main flue (2), a first boiler induced draft fan outlet flue (3) and a second boiler induced draft fan outlet flue (4) which are positioned at the same level are respectively communicated with two sides of the main flue (2), the axes of the first boiler induced draft fan outlet flue (3) and the second boiler induced draft fan outlet flue (4) are positioned on the same first axis (21), and a second axis (22) of the inner balance rod (1) in a horizontal state is higher than the first axis (21); the device comprises a first upper frame (5) and a first lower frame (6) which are connected and arranged at an obtuse angle, wherein the intersection is connected with one end of the inner balance rod (1), and the length of the first lower frame (6) is longer than that of the first upper frame (5), and the first upper frame (5) and the first lower frame (6) are obliquely arranged towards one side of an outlet flue (3) of the first boiler induced draft fan; The second upper frame (7) and the second lower frame (8) are connected and arranged at an obtuse angle, and the intersection is connected to the other end of the inner balance bar (1), wherein the length of the second lower frame (8) is longer than that of the second upper frame (7), and the second upper frame (7) and the second lower frame (8) are obliquely arranged towards one side of an outlet flue (4) of the second induced draft fan of the boiler; a plurality of first upper guide plates (9) which are parallel at intervals and are obliquely arranged on the first upper frame (5), wherein the first upper guide plates (9) are inclined at a first inclination angle relative to the second shaft (22); The plurality of first lower guide plates (10) are arranged on the first lower frame (6) in an inclined mode at intervals, wherein the inclined angle of the first lower guide plates (10) relative to the second axis (22) is a second inclined angle, and the second inclined angle is larger than the first inclined angle; A plurality of second upper guide plates (11) which are parallel at intervals and are obliquely arranged on the second upper frame (7), wherein the second upper guide plates (11) are inclined at a third inclination angle relative to the second shaft (22); The second lower guide plates (12) are arranged on the second lower frame (8) in an inclined mode, wherein the second lower guide plates (12) are inclined at a fourth inclination angle relative to the second shaft (22), and the fourth inclination angle is larger than the third inclination angle; The structure for preventing the smoke backflow comprises an initial state in which an inner balance rod (1) is in a horizontal state, a first state in which the inner balance rod (1) rotates in a first rotation direction when the smoke blowing power of a first boiler induced draft fan outlet flue (3) is larger than that of a second boiler induced draft fan outlet flue (4), a first upper guide plate (9) and a first lower guide plate (10) guide and convey the smoke of the first boiler induced draft fan outlet flue (3) upwards, a second upper guide plate (11) and a second lower guide plate (12) guide and convey the smoke of the second boiler induced draft fan outlet flue (4) horizontally, and a first state in which the smoke blowing power of the first boiler induced draft fan outlet flue (3) is smaller than that of the second boiler induced draft fan outlet flue (4), the inner balance rod (1) rotates in a second rotation direction, and the first upper guide plate (9) and the first lower guide plate (10) guide and convey the smoke of the first boiler induced draft fan outlet flue (3) horizontally, and the second upper guide plate (11) guide and the smoke of the second boiler induced draft fan outlet flue (4) horizontally and convey the smoke of the second boiler induced draft fan outlet flue (4) in the opposite rotation direction to the second rotation direction.
  2. 2. The structure for preventing smoke backflow according to claim 1, characterized in that the angle between the first upper frame (5) and the first lower frame (6) ranges from 120 ° to 160 °, and the angle between the second upper frame (7) and the second lower frame (8) ranges from 120 ° to 160 °.
  3. 3. The structure for preventing smoke backflow according to claim 1, wherein the difference in angle between the first inclination angle and the second inclination angle is not less than 15 degrees, and the difference in angle between the third inclination angle and the fourth inclination angle is not less than 15 degrees.
  4. 4. A smoke backflow preventing structure according to claim 3, wherein the first inclination angle is in the range of 30 ° to 45 °, and the third inclination angle is in the range of 30 ° to 45 °.
  5. 5. The smoke backflow prevention structure according to claim 4, wherein the first inclination angle ranges from 30 degrees to 40 degrees, and the third inclination angle ranges from 30 degrees to 40 degrees.
  6. 6. The smoke back flow preventing structure according to any one of claims 1 to 5, further comprising: an outer balance bar (13) which is positioned outside the main flue (2); The elastic component is connected with the two ends of the outer balance rod (13) and the outer wall of the main flue (2), and is suitable for keeping the outer balance rod (13) in a horizontal state; and the connecting rod (14) is used for connecting the middle of the inner balance rod (1) and the middle of the outer balance rod (13) after penetrating through the wall surface of the main flue (2), so that the inner balance rod (1) is also in a horizontal state when the outer balance rod (13) is in the horizontal state.
  7. 7. The smoke backflow preventing structure of claim 6 wherein the elastic assembly comprises: One end of each first elastic piece (15) and one end of each second elastic piece (16) are connected with one end of the connecting rod (14), and the other ends of the first elastic pieces (15) and the second elastic pieces (16) are respectively fixed on the outer wall surface of the main flue (2); One end of each of the third elastic piece (17) and the fourth elastic piece (18) is connected with the other end of the connecting rod (14), and the other ends of the third elastic piece (17) and the fourth elastic piece (18) are respectively fixed on the outer wall surface of the main flue (2).
  8. 8. The structure for preventing smoke backflow according to claim 7, wherein the first elastic member (15), the second elastic member (16), the third elastic member (17) and the fourth elastic member (18) are tension springs.
  9. 9. The smoke back flow preventing structure according to any one of claims 1 to 5, further comprising: the first limiting piece (19) is arranged at the lower end of the first lower frame (6), and the first limiting piece (19) is arranged to protrude towards one side of the outlet flue (3) of the first boiler induced draft fan; the second limiting piece (20) is arranged at the lower end of the second lower frame (8), and the second limiting piece (20) protrudes towards one side of the second boiler induced draft fan outlet flue (4).
  10. 10. The structure for preventing smoke backflow as set forth in claim 9, wherein, The first limiting piece (19) and the second limiting piece (20) are both C-shaped frames, the C-shaped opening of the first limiting piece (19) is arranged towards one side of the outlet flue (3) of the first boiler induced draft fan, and the C-shaped opening of the second limiting piece (20) is arranged towards one side of the outlet flue (4) of the second boiler induced draft fan.

Description

Structure for preventing smoke from flowing back Technical Field The invention relates to the technical field of boilers, in particular to a structure for preventing smoke from flowing back. Background When a plurality of boilers share one desulfurizing tower, the outlet flues of the induced draft fans of the boilers share one main flue of the inlet of the desulfurizing tower. When the two boiler induced draft fans are symmetrically arranged at the outlet flues, the power of the induced draft fans is different due to different loads of different boilers in operation, and the gas flow rates are greatly different. In addition, the acidic water mist in the flue gas is likely to corrode metal parts such as an impeller and a bearing of the induced draft fan, so that the impeller is unbalanced and vibrates, the induced draft fan is damaged, and the service life of the induced draft fan is obviously reduced. Disclosure of Invention In view of the above, the invention provides a structure for preventing smoke from flowing back, which solves the problems that when two boiler induced draft fans are symmetrically arranged in the prior art, smoke and ash carried by smoke and ash at the outlet flue of the boiler induced draft fan with higher power are blown into the outlet flue of the boiler induced draft fan with lower power, so that the outlet flue of a low-load boiler is caused to have the phenomenon of ash accumulation and flow back, and the flue is blocked, and acid water mist in the smoke and ash are likely to corrode metal parts such as an impeller, a bearing and the like of the induced draft fan, so that the impeller is unbalanced and vibrates, the induced draft fan is damaged, and the service life of the induced draft fan is obviously reduced. The invention provides a structure for preventing smoke from flowing back, which comprises the following components: The device comprises a main flue, an inner balance rod, a first boiler induced draft fan outlet flue, a second boiler induced draft fan outlet flue, an inner balance rod, a second boiler induced draft fan outlet flue, a first shaft line and a second shaft line, wherein the middle of the inner balance rod is rotatably connected to the wall surface of the main flue; The first upper frame and the first lower frame are connected at an obtuse angle, and the intersection is connected to one end of the inner balance rod; the length of the first lower frame is longer than that of the first upper frame, and the first upper frame and the first lower frame are obliquely arranged to one side of an outlet flue of the first boiler induced draft fan; The second upper frame and the second lower frame are connected and arranged at an obtuse angle, and the intersection is connected to the other end of the inner balance rod; the length of the second lower frame is longer than that of the second upper frame, and the second upper frame and the second lower frame are obliquely arranged to one side of an outlet flue of the second boiler induced draft fan; The first upper guide plates are obliquely arranged on the first upper frame, and the inclined angle of the first upper guide plates relative to the second axis is a first inclined angle; the plurality of first lower guide plates are arranged on the first lower frame in an inclined mode at intervals in parallel, and the inclined angle of the first lower guide plates relative to the second axis is a second inclined angle which is larger than the first inclined angle; the second upper guide plates are obliquely arranged on the second upper frame, and the second upper guide plates are inclined at a third inclination angle relative to the second axis; the second lower guide plates are obliquely arranged on the second lower frame, and the angle of inclination of the second lower guide plates relative to the second axis is a fourth inclination angle which is larger than the third inclination angle; The structure for preventing the smoke backflow comprises an initial state in which an inner balance rod is in a horizontal state, a second state in which the inner balance rod rotates in a first rotation direction when the smoke blowing power of a first boiler induced draft fan outlet flue is larger than that of a second boiler induced draft fan outlet flue, a first upper guide plate and a first lower guide plate guide and convey the smoke of the first boiler induced draft fan outlet flue upwards, a second upper guide plate and a second lower guide plate guide and convey the smoke of the second boiler induced draft fan outlet flue horizontally, and a third state in which the inner balance rod rotates in a second rotation direction when the smoke blowing power of the first boiler induced draft fan outlet flue is smaller than that of the second boiler induced draft fan outlet flue, the first upper guide plate and the first lower guide plate guide and convey the smoke of the first boiler induced draft fan outlet flue horizontally, and the sec