Soot blower of boiler superheater

Abstract

The invention relates to the technical field of soot blowing devices, and discloses a boiler superheater soot blowing device which comprises a pipeline system provided with a main pipe and branch pipes, the main pipe is distributed along the X axis and arranged on one side of the bottom of an in-boiler superheater, and the branch pipes are distributed along the Y axis, welded to one side of the main pipe and communicated with the main pipe; the ends, away from the main pipe, of the branch pipes extend to the bottom of the boiler superheater, a plurality of air holes with upward openings are formed in the surfaces of the branch pipes in the Y-axis direction at equal intervals, every two adjacent air holes form a group, and the two air holes in each group incline relatively to form an included angle. When the smoke passes through the smoke channel, the smoke collides and diffuses at the vertex of the included angle to form an air bed, so that the passing smoke is always in a boiling state and cannot be deposited; through the unique air hole collision design and the knocking system, by means of a turbulence area formed by collision airflow and vibration sonic boom, smoke dust is effectively removed and prevented from being deposited, and the risk of dust deposition is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of soot blowing devices, and in particular to a soot blowing device for a boiler superheater. Background Art

[0002] The soot blowing device for a boiler superheater is a device used to remove the ash deposited on the heating surface of the boiler superheater. During operation, serious ash deposition occurs on both sides at the bottom of the superheater, resulting in a reduction in heat transfer capacity and a low main steam temperature, which cannot ensure the minimum steam temperature standard for unit operation. At the same time, due to the ash deposition on both sides at the lower part of the superheater, a flue gas corridor is formed in the middle of the superheater, intensifying the wear of the middle superheater and threatening the safety production and economic benefits of the enterprise. Therefore, a soot blowing device is needed for cleaning.

[0003] Traditionally, a steam soot blower is generally used. By using the high-speed jet of steam, the steam is sprayed onto the heating surface of the superheater through the soot blowing gun barrel, and the kinetic energy of the steam is used to blow off the deposited ash.

[0004] However, during the spraying process, the steam will gradually diffuse, and its energy will decay with the increase of distance. At a relatively long distance, the energy of the steam may not be sufficient to blow off the deposited ash, resulting in a weakened soot blowing effect. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned existing soot blowing devices for boiler superheaters, the present invention is proposed.

[0006] The above technical problems are solved by the following technical solutions: The present invention provides a soot blowing device for a boiler superheater, including

[0007] A pipeline system having a main pipe and branch pipes. The main pipe is distributed along the X-axis and is arranged on one side at the bottom of the superheater in the furnace. The branch pipes are distributed along the Y-axis and are welded to one side of the main pipe and communicate with it.

[0008] One end of the branch pipe away from the main pipe extends to the bottom of the boiler superheater, and a plurality of upward-opening air holes are equidistantly arranged on the surface of the branch pipe along the Y-axis direction. Every two adjacent ones of the plurality of air holes form a group, and the two air holes in each group are inclined relative to each other to form an included angle. When gas is ejected from the two air holes, it will collide and diffuse at the vertex of the included angle to form an air bed, forcing the passing soot and dust to always be in a "boiling" state and unable to deposit.

[0009] In a preferred embodiment of the soot blowing device for a boiler superheater of the present invention: One end of the main pipe penetrates through the furnace wall and is connected to the air outlet end of an external air compressor.

[0010] In a preferred embodiment of the soot blowing device for a boiler superheater of the present invention: A plurality of branch pipes are provided, and the plurality of branch pipes are welded to the main pipe at equal intervals, and each branch pipe is located between two adjacent heat exchange pipes in the superheater.

[0011] In a preferred embodiment of the soot blowing device for the boiler superheater of the present invention: a heat insulation assembly is provided at the place where the main pipe penetrates the wall to prevent damage caused by the thermal expansion and contraction of the main pipe.

[0012] In a preferred embodiment of the soot blowing device for the boiler superheater of the present invention: the heat insulation assembly includes a heat insulation sheath and a refractory filling material. The heat insulation sheath is wrapped around the outside of the main pipe, and the refractory filling material is filled at the penetration of the heat insulation sheath and the furnace wall.

[0013] In a preferred embodiment of the soot blowing device for the boiler superheater of the present invention: a knocking system is further included, and the knocking system is sleeved and installed at the middle position of the branch pipe.

[0014] In a preferred embodiment of the soot blowing device for the boiler superheater of the present invention: the knocking system includes an air outlet hole and a mounting block sleeved and fixed on the branch pipe. Elastic striking components are symmetrically arranged on one side of the mounting block, and a triggering component is rotatably arranged on the mounting block. The triggering component uses the air flow blown out from the air outlet hole as power to trigger the elastic striking components to knock on the heat exchange pipes in the superheater.

[0015] In a preferred embodiment of the soot blowing device for the boiler superheater of the present invention: the elastic striking component includes a fixed seat, a movable rod penetrates through the fixed seat, a first trigger block is fixed at one end of the movable rod close to the triggering component, and an elastic member is sleeved outside the movable rod between the fixed seat and the first trigger block.

[0016] In a preferred embodiment of the soot blowing device for the boiler superheater of the present invention: the triggering component includes a lever, a baffle is arranged at one end of the lever corresponding to the air outlet hole, and a second trigger block is fixed at the bottom of the other end of the lever.

[0017] In a preferred embodiment of the soot blowing device for the boiler superheater of the present invention: the lever is rotatably connected to the mounting block.

[0018] The beneficial effects of the present invention are as follows: through the unique air hole collision design and knocking system of the present invention, the turbulent region and vibration sonic boom formed by the colliding air flow are used to effectively remove soot and prevent its deposition, significantly improve the heat exchange efficiency, and reduce the risk of ash accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention. Among them:

[0020] Figure 1Shows a three-dimensional structure diagram of a soot blower for a boiler superheater;

[0021] Figure 2 Shows a cross-sectional view of a branch pipe in a soot blower for a boiler superheater;

[0022] Figure 3 Shows Figure 1 An enlarged structure diagram at position A in

[0023] Figure 4 Shows a structure diagram of an elastic striking component and a firing component in a soot blower for a boiler superheater. Specific embodiments

[0024] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0025] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention, but these terms can vary according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms can be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0026] Referring to Figure 1-2 , this embodiment provides a soot blower for a boiler superheater, including,

[0027] A pipeline system 1, having a main pipe 11 and branch pipes 12, the main pipe 11 is distributed along the X-axis and is arranged on one side of the bottom of the in-furnace superheater, the branch pipes 12 are distributed along the Y-axis, welded to one side of the main pipe 11 and communicating with it;

[0028] One end of the branch pipe 12 far from the main pipe 11 extends to the bottom of the boiler superheater, and a number of upward-opening air holes 13 are equidistantly arranged on the surface of the branch pipe 12 along the Y-axis direction. A number of branch pipes 12 are welded to the main pipe 11 at equal intervals, and each branch pipe 12 is located between two adjacent heat exchange pipes in the superheater;

[0029] Every two adjacent ones of the number of air holes 13 are in a group, and the two air holes 13 in each group are inclined relative to each other to form an included angle. When gas is ejected from the two air holes 13, it will collide and diffuse at the vertex of the included angle to form an air bed, forcing the passing soot to always be in a "boiling" state and unable to deposit.

[0030] Specifically, one end of the main pipe 11 penetrates through the furnace wall and is connected to the air outlet of an external air compressor. When the air compressor operates, it compresses the air and transports it into the main pipe 11. The air then enters the branch pipes 12 through the main pipe and is ejected from the air holes 13. Since the branch pipes 12 are located at the bottom of the superheater, the upwardly ejected gas forms an air current from bottom to top. This air current can keep the soot in the superheater in a flowing state and make it flow along with the flue gas under the negative pressure of the flue gas, thus solving the problem of ash accumulation in the superheater.

[0031] The distance between two air holes 13 in the same group is 150 mm, and the included angle between these two air holes 13 is 60°. Assuming that the center points of the two air holes 13 are A and B respectively, and the distance between them is 150 mm, the point where the gas ejected from these two holes meets in the air is C. Since the included angle between the two inclined holes is 60°, it resembles an equilateral triangle, where AB = BC = AC = 150 mm.

[0032] In an equilateral triangle, when a perpendicular line is drawn from any vertex to the opposite side, this perpendicular line is the height of the triangle. In an equilateral triangle, the height is also the median and the angle bisector. Therefore, when a perpendicular line is drawn from point C to AB, with the foot of the perpendicular being D, CD is the height of the equilateral triangle.

[0033] In an equilateral triangle, the height can be calculated by the following formula:

[0034]

[0035] Substitute the side length of 150 mm into the formula:

[0036]

[0037] In the formula Substitute into the formula to get:

[0038]

[0039] Therefore, the gas ejected from the two air holes 13 will collide at a height of approximately 129.9 mm. After the collision, the gas diffuses in all directions, forming a relatively large air bed, forcing the passing soot to always be in a "boiling" state and preventing it from depositing.

[0040] The air currents ejected from the two air holes 13 at a 60° included angle collide at a height of 129.9 mm, forming a strong turbulent region. This can effectively break the deposition trend of the soot particles, blow them up from the superheater tube wall or other ash-accumulating areas and suspend them in the air current. Compared with the unidirectional jet air current, the turbulent intensity of the colliding air currents is higher and the action range is wider, which can more effectively prevent soot deposition.

[0041] The air bed formed by the colliding airflows can keep the soot particles in a suspended state all the time, similar to the "boiling" effect, so that the soot particles cannot deposit on the surface of the superheater, thus avoiding the formation of an ash accumulation layer. Even if a small amount of soot particles try to deposit, they will be quickly blown up by the airflow and re-enter the suspended state, further prolonging the suspension time of the soot and improving the soot blowing efficiency.

[0042] As an alternative embodiment:

[0043] Referring to Figure 1 , in an embodiment provided by the present application, a heat insulation component 14 is provided at the place where the main pipe 11 penetrates through the wall to prevent the main pipe 11 from being damaged due to thermal expansion and contraction.

[0044] The heat insulation component 14 includes a heat insulation sheath 141 and a refractory filling material 142. The heat insulation sheath 141 is wrapped around the outside of the main pipe 11, and the refractory filling material 142 is filled at the penetration of the heat insulation sheath 141 and the furnace wall.

[0045] Specifically, the heat insulation sheath 141 is made of aluminosilicate cotton, and the refractory filling material 142 is poured between the aluminosilicate cotton and the wall perforation. On the one hand, it can play a role in fixing the main pipe 11, and on the other hand, it can play a heat insulation role to prevent the main pipe 11 from being damaged due to thermal expansion and contraction.

[0046] As an alternative embodiment:

[0047] Referring to Figure 3-4 , in an embodiment provided by the present application, a soot blower for a boiler superheater further includes a knocking system 2, and the knocking system 2 is sleeved and installed at the middle position of the branch pipe 12.

[0048] The knocking system 2 includes an air outlet hole 21 and a mounting block 22 sleeved and fixed on the branch pipe 12. Elastic striking components 23 are symmetrically arranged on one side of the mounting block 22, and a firing component 24 is rotatably arranged on the mounting block 22. The firing component 24 uses the airflow blown out from the air outlet hole 21 as power to trigger the elastic striking components 23 to knock on the heat exchange tubes in the superheater.

[0049] The elastic striking component 23 includes a fixed seat 231, a movable rod 232 is penetrated through the fixed seat 231, a trigger block one 233 is fixed at one end of the movable rod 232 close to the firing component 24, and an elastic member 234 is sleeved outside the movable rod 232 between the fixed seat 231 and the trigger block one 233.

[0050] Specifically, one end of the movable rod 232 away from the trigger block one 233 is a spherical structure. The trigger block one 233 is squeezed by the firing assembly 24, driving the movable rod 232 to move horizontally, hitting the heat exchange tube in the superheater. When the movable rod 232 moves along with the trigger block one 233, the elastic member 234 will be compressed. The elastic member 234 is a spring, which will store energy after being compressed, and will drive the trigger block one 233 to move in the reverse direction after storing energy, so that the firing assembly 24 is reset.

[0051] The cross-section of the movable rod 232 is a hexagonal structure. A perforation is provided at the position of the fixed seat 231 corresponding to the movable rod 232. The cross-section of the perforation is the same as that of the movable rod 232. When the movable rod 232 reciprocates in the perforation, it will not rotate.

[0052] The firing assembly 24 includes a lever 241. A baffle 242 is provided at one end of the lever 241 corresponding to the air outlet hole 21, and a trigger block two 243 is fixed to the bottom of the other end of the lever 241.

[0053] Specifically, the trigger block one 233 is a trapezoidal structure, and the trigger block two 243 is an inverted triangular structure. The inclined surface of the trapezoidal structure of the trigger block one 233 is attached to the inclined surface of the trigger block two 243. When the trigger block two 243 is pressed down, its inclined surface is attached to the inclined surface of the trigger block one 233. Due to the inverted triangular structure of the trigger block two 243, it will drive the trigger block one 233 to make a horizontal displacement during the pressing process.

[0054] The lever 241 is rotatably connected to the mounting block 22. When the upward air flow blown out from the air outlet hole 21 impacts the baffle 242, the baffle 242 drives the lever 241 to rotate, so that the trigger block two 243 at the other end of the lever 241 presses down the trigger block one 233 vertically. The trigger block one 233 changes the vertically downward force into a horizontally directed force and transmits it to the movable rod 232 to achieve the hitting action.

[0055] When the gas blows out from the air outlet hole 21, its air flow direction is from bottom to top. The baffle 242 is attached above the air outlet hole 21. Therefore, the upward air flow will impact the baffle 242. The baffle 242, the lever 241 and the trigger block two 243 are all made of carbon fiber material, which has the advantage of being light in texture and is more sensitive after being impacted by the air flow. Since the lever 241 is rotatably connected to the mounting block 22, when the baffle 242 is impacted, it will drive the lever 241 to rotate. The other end will drive the trigger block two 243 to move downward and squeeze the trigger block one 233. The trigger block one 233 will make a horizontal displacement when being squeezed, compress the elastic member 234 during the horizontal displacement process, and at the same time drive the movable rod 232 to knock on the heat exchange tube in the superheater. After the knocking, it will return to its original position under the reaction force of the elastic member 234, causing the trigger block one 233 to squeeze the trigger block two 243 in the reverse direction, driving the trigger block two 243 to move upward, and then realizing the reverse rotation of the lever 241, prompting the baffle 242 to be in the range of the upward air flow of the air outlet hole 21 again, thus realizing the knocking action again. After the knocking, the surface of the heat exchange tube in the superheater will generate vibration, and the sonic boom generated by the vibration will accelerate the floating movement of the soot in the area, avoiding the soot from adsorbing on the surface of the heat exchange tube.

[0056] The firing assembly 24 of this structure uses air flow power to drive the elastic knocking assembly 23 to knock on the heat exchange tube. The generated vibration and sonic boom can effectively remove the soot on the surface of the heat exchange tube, avoid the accumulation of soot. Compared with the traditional cleaning method, it can achieve automatic and continuous cleaning, without frequent manual intervention, greatly reducing the maintenance cost.

[0057] Finally, it should be pointed out that the methods and devices described in detail above are only examples, and those skilled in the art can modify these examples in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A soot blowing device for a boiler superheater, characterized in that: including, a pipe system (1) having a main pipe (11) and branch pipes (12), the main pipe (11) being distributed along the X-axis and disposed on one side of the bottom of the in-furnace superheater, the branch pipes (12) being distributed along the Y-axis, welded to one side of the main pipe (11) and communicating therewith; one end of the branch pipe (12) away from the main pipe (11) extends to the bottom of the boiler superheater, and a plurality of upwardly-opening air holes (13) are equidistantly formed on the surface of the branch pipe (12) along the Y-axis direction. Every two adjacent ones of the plurality of air holes (13) form a group, and the two air holes (13) in each group are inclined relative to each other to form an included angle. When gas is ejected from the two air holes (13), it will collide and diffuse at the vertex of the included angle to form an air bed, forcing the passing soot to always be in a "boiling" state and preventing deposition.

2. The soot blower device for a boiler superheater according to claim 1, wherein: One end of the main pipe (11) penetrates the in-furnace wall and is connected to the air outlet end of an external air compressor.

3. The soot blower device for boiler superheater according to claim 2, characterized in that: A plurality of branch pipes (12) are provided, and the plurality of branch pipes (12) are welded to the main pipe (11) at equal intervals. Each branch pipe (12) is located between two adjacent heat exchange pipes in the superheater.

4. The soot blower device for the boiler superheater according to claim 2, characterized in that: A heat insulation assembly (14) is provided at the position where the main pipe (11) penetrates the wall to prevent damage to the main pipe (11) caused by thermal expansion and contraction.

5. The soot blower device for the boiler superheater according to claim 4, characterized in that: The heat insulation assembly (14) includes a heat insulation sheath (141) and a refractory filler (142). The heat insulation sheath (141) wraps around the outside of the main pipe (11), and the refractory filler (142) is filled at the penetration of the heat insulation sheath (141) and the in-furnace wall.

6. The soot blower device for a boiler superheater according to claim 1, characterized in that: It further includes a knocking system (2), and the knocking system (2) is sleeved and installed at the middle position of the branch pipe (12).

7. The soot blower device for the boiler superheater according to claim 6, characterized in that: The knocking system (2) includes an air outlet hole (21) and a mounting block (22) sleeved and fixed on the branch pipe (12). Elastic knocking assemblies (23) are symmetrically arranged on one side of the mounting block (22), and a triggering assembly (24) is rotatably arranged on the mounting block (22). The triggering assembly (24) uses the airflow blown out from the air outlet hole (21) as power to trigger the elastic knocking assemblies (23) to knock on the heat exchange pipes in the superheater.

8. The soot blower device for boiler superheater according to claim 7, characterized in that: The elastic knocking assembly (23) includes a fixed seat (231), a movable rod (232) is penetrated through the fixed seat (231), a trigger block one (233) is fixed at one end of the movable rod (232) close to the triggering assembly (24), and an elastic member (234) is sleeved on the outside of the movable rod (232) between the fixed seat (231) and the trigger block one (233).

9. The soot blower device for the boiler superheater according to claim 8, wherein: The triggering assembly (24) includes a lever (241), a baffle (242) is arranged at one end of the lever (241) corresponding to the air outlet hole (21), and a trigger block two (243) is fixed at the bottom of the other end of the lever (241).

10. The soot blower device for boiler superheater according to claim 9, characterized in that: The lever (241) is rotatably connected to the mounting block (22).

Images