A ventilation structure for the exhaust pipeline of a steam-electric dual-drive steam turbine

Abstract

The present invention discloses a ventilation structure for the exhaust pipeline of a steam-electric dual-drive steam turbine, which includes a flue pipe. The inlet end of the flue pipe is provided with an outlet of a dust collector, and the outlet end of the flue pipe is provided with an inlet of a induced draft fan. A pressure reduction and air collection device for reducing the relatively large wind pressure at the outlet end of the dust collector and straightening the air vortex is arranged inside the outlet of the dust collector. With the cooperation of the internal components of the pressure reduction and air collection device of the present invention and the structural setting of the air disc rotating blades, the mixing of local air vortices in the gas just coming out of the dust collector is realized by using the centrifugal force and the wind driving function, avoiding the impact damage phenomenon of the local air vortices on the outlet interface end of the dust collector. In addition, through the cooperation of the internal components of the wind pressure cleaning device and the structural setting of the cleaning blades, the cleaning function of the flue gas outlet is achieved by using the rotational force and extrusion force converted from the wind energy, prolonging the cleaning cycle of the inner pipe interface and ensuring the stable progress of the exhaust.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines, and particularly to a ventilation structure for the exhaust pipe of a steam-electric dual-drive steam turbine. Background Art

[0002] Due to the continuous development of metallurgical technology, the structure of steam turbines has also been greatly improved. Among them, large units generally adopt a double-layer structure of combined high and medium pressure cylinders, a single-rotor structure for high and medium pressure rotors, and integral forging structures for high, medium, and low pressure rotors. Tilt-pad bearings are more commonly used. A steam turbine is a rotary steam power device. Under high temperature and high pressure conditions, high-pressure steam passes through fixed nozzles to become an accelerated air flow and then jets onto the blades, causing the rotor equipped with blade rows to rotate and perform external work at the same time. A steam turbine is the main equipment of modern thermal power plants, but it is also used in power plants.

[0003] In the previous exhaust pipe structure settings, the pressure inside the flue gradually decreases from the outlet of the dust collector to the inlet of the induced draft fan. There will be a phenomenon of uneven radial pressure distribution inside the pipe, manifested as higher pressure on the outside and inside of the pipe and lower pressure on the inside of the pipe. This is caused by the forced extrusion of fluid flow and local vortices, which will cause certain impact damage to the pipe. In addition, in the previous exhaust pipe structure, the outlet end of the dust collector needs to be regularly maintained and cleaned to avoid the phenomenon of blocked exhaust due to excessive dust accumulation inside.

[0004] To solve the above problems, a ventilation structure for the exhaust pipe of a steam-electric dual-drive steam turbine is proposed. Summary of the Invention

[0005] The purpose of the present invention is to solve the drawbacks existing in the prior art, and a ventilation structure for the exhaust pipe of a steam-electric dual-drive steam turbine is proposed.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A ventilation structure for the exhaust pipe of a steam-electric dual-drive steam turbine, comprising:

[0008] A flue pipe, the inlet end of the flue pipe is provided with an outlet of a dust collector, and the outlet end of the flue pipe is provided with an inlet of an induced draft fan;

[0009] A pressure reduction and air collection device for reducing the wind pressure and correcting the wind vortex at the outlet end of the dust collector is arranged inside the outlet of the dust collector;

[0010] A wind pressure cleaning device for cleaning the inside of the outlet end of the dust collector by driving rotation through the pressure reduction and air collection device is arranged inside the pressure reduction and air collection device.

[0011] Preferably, the decompression air collecting device includes a flue decompression ring, a limiting ring, a wind disk base, wind disk rotating blades and a wind disk through hole. The flue decompression ring is fixedly installed inside the outlet of the dust collector. The limiting ring is fixed to the outer wall of the top end of the flue decompression ring. The limiting ring is slidably connected with a limiting groove arranged inside the outlet of the dust collector. The wind disk base is fixedly installed at the top end of the flue decompression ring. A plurality of the wind disk rotating blades are fixedly installed at the top end of the wind disk base. The wind disk through hole is opened on the side wall of the wind disk base.

[0012] Preferably, the wind pressure cleaning device includes a wind pressure ring, elastic telescopic rods, a cleaning base, a wind pressure through pipe, cleaning blade slots, cleaning blades, an air outlet pipe opening and an elastic component. The wind pressure ring is slidably connected with the inner side wall of the flue decompression ring. A plurality of the elastic telescopic rods are fixedly installed at the bottom end of the wind pressure ring. The cleaning base is fixedly installed at the bottom ends of the plurality of elastic telescopic rods. The top end of the cleaning base is fixedly connected with the bottom end of the flue decompression ring. The wind pressure through pipe is fixedly installed on the side wall of the bottom end of the wind pressure ring. The cleaning blade slots are symmetrically opened at both ends of the cleaning base with respect to the diameter of the cleaning base. The cleaning blades are slidably connected with the cleaning blade slots. The air outlet pipe opening is opened on the middle side wall of the wind pressure ring;

[0013] The elastic component includes a connecting block, a connecting block sliding groove and a connecting spring. The connecting block is fixedly installed on the side wall of the cleaning blade. The connecting block sliding groove is opened on the side wall of the cleaning blade slot. The connecting block sliding groove is slidably connected with the connecting block. The connecting spring is fixedly installed between the side walls of the connecting block sliding groove and the connecting block.

[0014] Preferably, a plurality of the wind disk rotating blades are equidistantly distributed in a ring shape with respect to the wind disk base. The cross-sectional view of a plurality of the wind disk rotating blades is arranged in a hook-shaped structure.

[0015] Preferably, the elastic telescopic rods are equidistantly arranged with respect to the side wall of the wind pressure ring. The side wall of the elastic telescopic rod does not contact the outer wall of the wind pressure through pipe. The top end of the wind pressure ring does not contact the bottom end of the wind disk base.

[0016] Preferably, the installation height of the connecting block is the same as the opening height of the connecting block sliding groove. When the cleaning blade slides, the connecting block sliding groove and the horizontal side wall of the connecting block are tightly pressed against each other, and the connecting spring is always in a compressed state.

[0017] Preferably, the air pressure through - pipe has the same diameter as the orifice end of the air outlet pipe. The air pressure through - pipe is in communication with the air outlet pipe. The air duct opening of the air pressure through - pipe is opened from the top end of the air pressure through - pipe to the bottom end of the air pressure through - pipe. The air pressure through - pipe is arranged with a structure of decreasing inner - diameter from the air - pressure ring end to the cleaning base end.

[0018] Preferably, the air pressure through - pipe is in tight contact with the side walls of the two cleaning sheets but is not fixedly connected. The outer side wall of the cleaning sheet is arranged with a curved - surface structure. The side wall of the curved - surface structure can be in tight contact with the inner side wall of the dust - collector outlet exactly when exhausting air.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. Through the cooperation of the internal components of the decompression air - collecting device and the structural setting of the air - disc rotating piece, the present invention utilizes the functions of centrifugal force and wind force to realize the mixing of local air vortices in the gas just coming out of the dust collector, avoiding the impact damage phenomenon of the interface end of the dust - collector outlet caused by local air vortices.

[0021] 2. Through the cooperation of the internal components of the air - pressure cleaning device and the structural setting of the cleaning sheet, the present invention utilizes the rotational force and extrusion force converted from wind energy to achieve the cleaning function of the flue - gas duct opening, extends the cleaning cycle of the inner - pipe interface, and ensures the stable exhaust. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the flue - duct structure of an exhaust - pipe ventilation structure of a steam - electric dual - drive steam turbine proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of the decompression ring of an exhaust - pipe ventilation structure of a steam - electric dual - drive steam turbine proposed by the present invention;

[0024] Figure 3 It is a schematic diagram of the first split structure of the flue - duct decompression ring of an exhaust - pipe ventilation structure of a steam - electric dual - drive steam turbine proposed by the present invention;

[0025] Figure 4 It is a schematic diagram of the second split structure of the flue - duct decompression ring of an exhaust - pipe ventilation structure of a steam - electric dual - drive steam turbine proposed by the present invention;

[0026] Figure 5 It is a schematic diagram of the third split structure of the flue - duct decompression ring of an exhaust - pipe ventilation structure of a steam - electric dual - drive steam turbine proposed by the present invention;

[0027] Figure 6 It is a schematic diagram of the split structure of the cleaning base of an exhaust - pipe ventilation structure of a steam - electric dual - drive steam turbine proposed by the present invention.

[0028] In the figure: 1, flue duct; 12, dust collector outlet; 13, induced draft fan inlet; 2, flue duct pressure reducing ring; 21, limit ring; 22, wind disk base; 23, wind disk rotating vane; 24, wind disk vent; 3, wind pressure ring; 31, elastic telescopic rod; 32, cleaning base; 33, wind pressure vent pipe; 34, cleaning blade slot; 35, cleaning blade; 36, air outlet pipe opening; 37, connecting block; 38, connecting block chute; 39, connecting spring. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] Refer to Figure 1-6 , a ventilation structure for the exhaust pipeline of a steam-electric dual-drive steam turbine, including:

[0031] A flue duct 1, with a dust collector outlet 12 provided at the inlet end of the flue duct 1, and an induced draft fan inlet 13 provided at the outlet end of the flue duct 1;

[0032] A pressure reducing and air collecting device for reducing the large wind pressure at the dust collector outlet 12 end and straightening the air vortex is arranged inside the dust collector outlet 12;

[0033] A wind pressure cleaning device, which is driven by the pressure reducing and air collecting device to rotate and clean the inside of the dust collector outlet 12, is arranged inside the pressure reducing and air collecting device.

[0034] The present invention is further described in detail: The pressure reducing and air collecting device includes a flue duct pressure reducing ring 2, a limit ring 21, a wind disk base 22, wind disk rotating vanes 23 and a wind disk vent 24. The flue duct pressure reducing ring 2 is fixedly installed inside the dust collector outlet 12. The limit ring 21 is fixed to the top outer wall of the flue duct pressure reducing ring 2, and the limit ring 21 is slidably connected with the limit groove provided inside the dust collector outlet 12. The wind disk base 22 is fixedly installed on the top of the flue duct pressure reducing ring 2. A plurality of wind disk rotating vanes 23 are fixedly installed on the top of the wind disk base 22, and the wind disk vent 24 is opened on the side wall of the wind disk base 22.

[0035] The present invention is further described in detail: The wind pressure cleaning device includes a wind pressure ring 3, elastic telescopic rods 31, a cleaning base 32, a wind pressure through pipe 33, cleaning blade slots 34, cleaning blades 35, an air outlet pipe opening 36, and an elastic component. The wind pressure ring 3 is slidably connected to the inner side wall of the flue pressure reducing ring 2. A plurality of elastic telescopic rods 31 are fixedly installed at the bottom end of the wind pressure ring 3. The cleaning base 32 is fixedly installed at the bottom ends of the plurality of elastic telescopic rods 31. The top end of the cleaning base 32 is fixedly connected to the bottom end of the flue pressure reducing ring 2. The wind pressure through pipe 33 is fixedly installed on the side wall at the bottom end of the wind pressure ring 3. The cleaning blade slots 34 are symmetrically formed at both ends of the cleaning base 32 with respect to the diameter of the cleaning base 32. The cleaning blades 35 are slidably connected to the cleaning blade slots 34. The air outlet pipe opening 36 is formed in the middle side wall of the wind pressure ring 3;

[0036] The elastic component includes a connecting block 37, a connecting block sliding groove 38, and a connecting spring 39. The connecting block 37 is fixedly installed on the side wall of the cleaning blade 35. The connecting block sliding groove 38 is formed in the side wall of the cleaning blade slot 34. The connecting block sliding groove 38 is slidably connected to the connecting block 37. The connecting spring 39 is fixedly installed between the side walls of the connecting block sliding groove 38 and the connecting block 37.

[0037] The present invention is further described in detail: A plurality of wind disk rotating blades 23 are equidistantly distributed in a ring shape with respect to the wind disk base 22. The cross-sectional view of the plurality of wind disk rotating blades 23 is provided with a hook-shaped structure.

[0038] The present invention is further described in detail: The elastic telescopic rods 31 are equidistantly arranged on the side wall of the wind pressure ring 3. There is no contact between the side wall of the elastic telescopic rod 31 and the outer wall of the wind pressure through pipe 33. There is no contact between the top end of the wind pressure ring 3 and the bottom end of the wind disk base 22.

[0039] The present invention is further described in detail: The installation height of the connecting block 37 is the same as the opening height of the connecting block sliding groove 38. When the cleaning blade 35 slides, the horizontal side walls of the connecting block sliding groove 38 and the connecting block 37 are tightly pressed against each other, and the connecting spring 39 is always in a compressed state.

[0040] The present invention is further described in detail: The mouth end diameters of the wind pressure through pipe 33 and the air outlet pipe opening 36 are the same. The wind pressure through pipe 33 and the air outlet pipe opening 36 are mutually communicated. The air duct opening of the wind pressure through pipe 33 extends from the top end to the bottom end of the wind pressure through pipe 33. The wind pressure through pipe 33 is provided with a structure in which the inner diameter decreases from the wind pressure ring 3 end to the cleaning base 32 end.

[0041] The present invention is further described in detail: The wind pressure through pipe 33 is tightly pressed against the side walls of the two cleaning blades 35 but is fixedly connected. The outer side wall of the cleaning blade 35 is provided with a curved surface structure. The side wall of the curved surface structure can just be tightly pressed against the inner side wall of the dust collector outlet 12 during exhaust.

[0042] It is known that the flue pressure reducing ring 2, the wind disk base 22, the wind disk rotor 23 and the wind pressure ring 3 in this device are made of light and high temperature resistant materials. When air is taken in at the dust collector outlet 12, the wind pressure is greater than the elastic force of the elastic telescopic rod 31;

[0043] Before the exhaust operation begins, the distance between the outermost ends of the two cleaning sheets 35 is smaller than the maximum diameter distance of the bottom end of the flue pressure relief ring 2, that is, the cleaning sheets 35 do not conflict with the inner wall of the dust collector outlet 12 at this time.

[0044] The first benefit of the present invention is described below:

[0045] At the beginning of exhaust work, due to the smooth pipeline gas, the dust collector outlet 12 is the entrance of the flue pipe 1. According to the flue pressure relief ring 2 shown in FIG. Figure 2 The flue pressure reducing ring 2 shown is inverted, that is, the appearance of the outlet 12 end of the dust collector. At this time, the gas flow at the outlet 12 end of the dust collector is diffused everywhere, thereby forming a local cyclone, which causes the inner tube side wall of the outlet 12 end of the dust collector to be squeezed by the cyclone. At this time, the gas flow drives multiple local cyclones to blow toward the wind disk base 22 end. Since the cross-sectional section of the wind disk rotor 23 adopts a hook-shaped structure, the local cyclones around the gas flow blow toward the wind disk rotor 23, and driven by the main airflow, part of the airflow enters the interior of the flue pressure reducing ring 2 through the wind disk opening 24, and the remaining airflow cooperates with the local cyclone of the tube wall to drive the wind disk rotor 23 to rotate. The wind disk rotor 23 adopts a light structure and can rotate under the driving effect of a small wind force.

[0046] The rotation of the wind disk rotor 23 drives the rotation of the flue pressure relief ring 2 which is indirectly fixedly connected to it. Due to the rotation of the flue pressure relief ring 2, when the main airflow enters the interior of the flue pressure relief ring 2, a small mainstream cyclone with greater attraction than the local cyclone is formed due to the rotation of the flue pressure relief ring 2. With the attraction of the mainstream airflow and the curved surface guiding effect of the arc-shaped surface of the wind disk rotor 23 during the rotation process, the local cyclone is sucked into the interior of the flue pressure relief ring 2 under the action of the mainstream cyclone, thereby reducing the stamping damage to the pipeline by the high-speed chaotic gas just coming out of the dust collector.

[0047] According to the contents described in the article, the present invention achieves mixing of local cyclones in the gas just coming out of the dust collector by utilizing the coordinated action of the internal components of the pressure reducing wind collecting device and the structural setting of the wind disk rotor 23, and utilizing the centrifugal force and wind driving function, thereby avoiding damage to the interface end of the dust collector outlet 12 caused by the impact of the local cyclone.

[0048] The second benefit of the present invention is described below:

[0049] according to Figure 4As shown in the figure, when the mainstream cyclone and the local cyclone enter the flue decompression ring 2 through the wind disk opening 24, since there is no contact between the top end of the wind pressure ring 3 and the bottom end of the wind disk base 22, at this time, the mixed wind enters the flue decompression ring 2 and pushes the wind pressure ring 3 to slide downward. At this time, the wind pressure through pipe 33 slides downward simultaneously with the descent of the wind pressure ring 3. Since the connecting spring 39 is always in a compressed state, the wind pressure through pipe 33 always remains in contact with the two cleaning pieces 35 but is not fixedly connected, and the diameter of the wind pressure through pipe 33 decreases from top to bottom. During the downward movement of the wind pressure through pipe 33, it starts to push the two cleaning pieces 35 to expand outward at both ends, and the connecting spring 39 is further compressed under the compressed condition. When the outer side walls of the two cleaning pieces 35 expand to be in contact with the inner side wall of the dust collector outlet 12, the wind pressure ring 3 is restricted. At the same time, since the cleaning base 32 is fixedly connected to the wind pressure ring 3, when the wind disk rotating piece 23 rotates, it drives the cleaning base 32 to rotate, and at the same time drives the cleaning pieces 35 to rotate, thereby cleaning the inner wall of the dust collector outlet 12 at the flue opening.

[0050] According to the content described in the text, it can be known that: through the cooperation of the internal components of the wind pressure cleaning device and the structural setting of the cleaning piece 35, the present invention utilizes the rotational force and extrusion force converted from wind energy to achieve the cleaning function of the flue opening, extends the cleaning cycle of the inner pipe interface, and ensures the stable exhaust.

[0051] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A ventilation structure for the exhaust pipe of a steam-electric dual-drive steam turbine, comprising: A flue pipe (1), with a dust collector outlet (12) provided at the inlet end of the flue pipe (1), and an induced draft fan inlet (13) provided at the outlet end of the flue pipe (1); A pressure reduction and air collection device, which is used to reduce the wind pressure and correct the wind vortex at the larger wind pressure end of the dust collector outlet (12), and is arranged inside the dust collector outlet (12); A wind pressure cleaning device, which is arranged inside the pressure reduction and air collection device and drives the rotation to clean the inner part of the dust collector outlet (12) at the inlet end; The pressure reduction and air collection device includes a flue pressure reduction ring (2), a limit ring (21), a wind disk base (22), wind disk rotating vanes (23) and a wind disk through hole (24). The flue pressure reduction ring (2) is fixedly installed inside the dust collector outlet (12), the limit ring (21) is fixed to the outer wall of the top end of the flue pressure reduction ring (2), and the limit ring (21) is slidably connected with a limit groove provided inside the dust collector outlet (12). The wind disk base (22) is fixedly installed at the top end of the flue pressure reduction ring (2), a plurality of the wind disk rotating vanes (23) are fixedly installed at the top end of the wind disk base (22), and the wind disk through hole (24) is opened on the side wall of the wind disk base (22); The wind pressure cleaning device includes a wind pressure ring (3), elastic telescopic rods (31), a cleaning base (32), a wind pressure through pipe (33), cleaning blade slots (34), cleaning blades (35), an air outlet pipe opening (36) and an elastic component. The wind pressure ring (3) is slidably connected with the inner side wall of the flue pressure reduction ring (2), a plurality of the elastic telescopic rods (31) are fixedly installed at the bottom end of the wind pressure ring (3), the cleaning base (32) is fixedly installed at the bottom ends of the plurality of elastic telescopic rods (31), and the top end of the cleaning base (32) is fixedly connected with the bottom end of the flue pressure reduction ring (2). The wind pressure through pipe (33) is fixedly installed on the side wall of the bottom end of the wind pressure ring (3), the cleaning blade slots (34) are symmetrically opened at both ends of the cleaning base (32) with respect to the diameter of the cleaning base (32), the cleaning blades (35) are slidably connected with the cleaning blade slots (34), and the air outlet pipe opening (36) is opened on the middle side wall of the wind pressure ring (3); The elastic component includes a connecting block (37), a connecting block chute (38) and a connecting spring (39). The connecting block (37) is fixedly installed on the side wall of the cleaning blade (35), the connecting block chute (38) is opened on the side wall of the cleaning blade slot (34), the connecting block chute (38) is slidably connected with the connecting block (37), and the connecting spring (39) is fixedly installed between the side walls of the connecting block chute (38) and the connecting block (37).

2. The air vent structure of the exhaust pipeline of the steam-electric dual-drive steam turbine according to claim 1, wherein, A plurality of the air disc rotating pieces (23) are equidistantly distributed in a ring shape with respect to the air disc base (22), and the cross-sectional view of the plurality of the air disc rotating pieces (23) is arranged in a hook-shaped structure.

3. The air vent structure of the exhaust pipeline of a steam-electric dual-drive steam turbine according to claim 1, characterized in that, The elastic telescopic rods (31) are equidistantly arranged on the side wall of the wind pressure ring (3), there is no contact between the side wall of the elastic telescopic rod (31) and the outer wall of the wind pressure through pipe (33), and there is no contact between the top end of the wind pressure ring (3) and the bottom end of the air disc base (22).

4. A ventilation structure for the exhaust pipeline of a steam-electric dual-drive steam turbine according to claim 1, characterized in that, The installation height of the connection block (37) is the same as the opening height of the connection block sliding groove (38). When the cleaning piece (35) slides, the connection block sliding groove (38) and the horizontal side wall of the connection block (37) are tightly abutted against each other, and the connection spring (39) is always in a compressed state.

5. A ventilation structure for the exhaust pipeline of a steam-electric dual-drive steam turbine according to claim 1, characterized in that, The wind pressure through pipe (33) has the same port diameter as the port of the air outlet pipe (36). The wind pressure through pipe (33) is in communication with the air outlet pipe (36). The air duct opening of the wind pressure through pipe (33) is opened from the top end to the bottom end of the wind pressure through pipe (33). The wind pressure through pipe (33) is arranged in a structure with a decreasing inner diameter from the wind pressure ring (3) end to the cleaning base (32) end.

6. The air venting structure of the exhaust pipeline of a steam-electric dual-drive steam turbine according to claim 5, characterized in that, The wind pressure through pipe (33) is tightly abutted against the side walls of the two cleaning pieces (35) but fixedly connected. The outer side wall of the cleaning piece (35) is arranged in a curved surface structure, and the side wall of the curved surface structure can just be tightly abutted against the inner side wall of the dust collector outlet (12) during air exhaust.

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