Blockage clearing device for rotary air preheater

Abstract

The invention is suitable for the technical field of boilers, and provides a rotary air preheater unblocking device which comprises a preheating assembly, an air guide cleaning assembly and a cleaning assembly, and the air guide cleaning assembly is additionally arranged on a rotary air preheater body; the preheating assembly is assembled at the end head of one end of the air guide cleaning assembly; the cleaning assembly is assembled at the end of the other end of the air guide cleaning assembly, a power device is installed in the cleaning assembly, and the power device is used for driving the air guide cleaning assembly to rotate in a closed loop mode; after the air guide cleaning assembly receives the flue gas, the flue gas is brought into the cleaning assembly by the power device for preheating, and meanwhile, a brushing plate in the cleaning assembly is used for brushing; after the air guide cleaning assembly receives the flue gas, the flue gas is brought into the cleaning assembly by the power device for preheating, and meanwhile, a brushing plate in the cleaning assembly is used for brushing; blockage clearing of the rotary air preheater is achieved, and safe and stable operation of the rotary air preheater is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and particularly to a clogging clearing device for a rotary air preheater. Background Art

[0002] There are two types of air preheaters widely used in power station boilers: tubular and rotary. The heat transfer mode of the tubular air preheater is that heat is continuously transferred from the flue gas to the air through the tube wall, which belongs to the indirect heat transfer mode. The rotary air preheater transfers heat in a regenerative manner, and the flue gas and air flow through the heating surface alternately. When the flue gas flows through, heat is transferred from the flue gas to the heating surface, the temperature of the heating surface rises, and heat is stored; when the air flows through again, the heating surface releases the stored heat to the air.

[0003] In the field of power station boilers, a denitration device is installed upstream of the rotary air preheater. The denitration device uses ammonia to react with nitrogen oxides in the flue gas to remove nitrogen oxides in the flue gas; nitrogen oxides refer to compounds composed of nitrogen and oxygen elements; including various compounds such as dinitrogen monoxide, nitric oxide, nitrogen dioxide, dinitrogen trioxide, dinitrogen tetroxide, and dinitrogen pentoxide. Except for nitrogen dioxide, other nitrogen oxides are extremely unstable and turn into nitrogen dioxide and nitric oxide when exposed to light, moisture, or heat, and nitric oxide turns into nitrogen dioxide again.

[0004] Ammonia escape will occur during the operation of the denitration device. When ammonium bisulfate flows with the flue gas to the cold end of the downstream rotary air preheater, the temperature will usually be lower than its dew point temperature, so condensation occurs and adheres to the surface of the heat exchange elements of the rotary air preheater. Based on this, a clogging clearing device for a rotary air preheater is specifically proposed. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a clogging clearing device for a rotary air preheater, aiming to solve the problem that a denitration device installed upstream of the rotary air preheater will have ammonia escape during operation. When ammonium bisulfate flows with the flue gas to the cold end of the downstream rotary air preheater, the temperature will usually be lower than its dew point temperature, so condensation occurs and adheres to the surface of the heat exchange elements of the rotary air preheater.

[0006] Specifically: A clogging removal device for a rotary air preheater includes a preheating assembly, a wind guiding and cleaning assembly, and a cleaning assembly. The wind guiding and cleaning assembly is installed on the main body of the rotary air preheater; the preheating assembly is assembled at one end of the wind guiding and cleaning assembly to provide heat preservation for the wind guiding and cleaning assembly; the cleaning assembly is assembled at the other end of the wind guiding and cleaning assembly. A power device is installed inside the cleaning assembly, and the power device is used to drive the wind guiding and cleaning assembly to rotate in a closed loop; after the wind guiding and cleaning assembly receives flue gas, it is brought into the interior of the cleaning assembly by the power device for preheating, and at the same time, a cleaning brush plate inside the cleaning assembly is used for cleaning; before the wind guiding and cleaning assembly receives flue gas, the preheating assembly is used to heat and keep the wind guiding and cleaning assembly warm, so as to ensure that the wind guiding and cleaning assembly is always higher than the acid dew point temperature and the ammonium bisulfate dew point temperature when receiving flue gas, preventing the formation of ammonium bisulfate and its adhesion with ash in the soot from clogging the heat exchange elements of the rotary air preheater; after the wind guiding and cleaning assembly receives flue gas, it is brought into the interior of the cleaning assembly by the power device for preheating, and at the same time, a cleaning brush plate inside the cleaning assembly is used for cleaning; realizing the clogging removal of the rotary air preheater and ensuring the safe and stable operation of the rotary air preheater.

[0007] The technical solution of the present application will be further described below: In one embodiment, the wind guiding and cleaning assembly includes: A wind guiding and cleaning member, which is in a head-to-tail closed-loop shape and is used to receive soot; Side plates, which are installed on the side edges of one side of the wind guiding and cleaning member; Side frames, which are installed on the side edges of the other side of the wind guiding and cleaning member.

[0008] Furthermore, the wind guiding and cleaning assembly further includes a gas collecting chamber, and the gas collecting chamber is located in the space surrounded by the side plates, the side frames and the wind guiding and cleaning member.

[0009] Still further, a gas guiding hood assembly is installed on the side frame, and the gas guiding hood assembly is communicated with the gas collecting chamber; the gas guiding hood assembly is detachably assembled on the side frame.

[0010] The gas guiding hood assembly includes: A reinforcing frame, which is detachably installed on the side frame through a plurality of screws; A gas guiding hood, which is in a single-opening shape, and the single opening of the gas guiding hood penetrates inside the reinforcing frame and is integrally fixed with the reinforcing frame; A plurality of exhaust fans, and the plurality of exhaust fans are all detachably installed on the gas guiding hood; the plurality of exhaust fans are equally spaced along the main body direction of the gas guiding hood.

[0011] Furthermore, the wind guiding and cleaning member is movably assembled with the side plates and the side frames; one ends of the side plates and the side frames are fixed on the cleaning assembly, and the other ends are fixed on the preheating assembly.

[0012] In one embodiment: The power device includes a driving motor. A rotating shaft is fixed on the output shaft of the driving motor. A driving gear is fixed on the rotating shaft. The driving gear is power-transmission connected to the air guide and cleaning assembly, and drives the air guide and cleaning assembly to rotate in a closed loop.

[0013] In one embodiment: The cleaning brush plate includes a plate body and a hydraulic telescopic rod. One end of the hydraulic telescopic rod is installed on the plate body, and the other end is installed inside the cleaning assembly; bristles are laid on the plate body.

[0014] Regarding the "hydraulic telescopic rod": The hydraulic telescopic rod is a prior art, and its detailed structure can be obtained from existing literature and periodicals. At the same time, it can be directly purchased on the market, or parts can be purchased on the market for assembly, etc.; it is not what the present invention aims to protect, so no detailed description will be given here.

[0015] In one embodiment, the air guide and cleaning assembly includes a plurality of unit air guide and cleaning members, and the plurality of unit air guide and cleaning members are rotatably connected to each other; the unit air guide and cleaning member includes an air guide and cleaning plate and chain links. There are two chain links, which are distributed at both ends of the air guide and cleaning plate; the chain links on the plurality of unit air guide and cleaning members are connected to each other to form a complete closed-loop chain, and the chain is power-transmission connected to the power device.

[0016] Furthermore, the air guide and cleaning assembly further includes a plurality of elastic connection bands, and the plurality of elastic connection bands are sequentially distributed between the air guide and cleaning plates of the plurality of unit air guide and cleaning members; a plurality of air guide holes are formed in the air guide and cleaning plate, and the plurality of air guide holes are distributed in multiple rows and multiple columns on the air guide and cleaning plate.

[0017] Compared with the prior art, the clogging removal device for the rotary air preheater of the present invention can: before the air guide and cleaning assembly receives flue gas, use the preheating assembly to heat and insulate the air guide and cleaning assembly, so that the air guide and cleaning assembly is always higher than the acid dew point temperature and the ammonium bisulfate dew point temperature when receiving flue gas, preventing the formation of ammonium bisulfate and its adhesion with the ash in the soot to block the heat exchange elements of the rotary air preheater; after the air guide and cleaning assembly receives flue gas, it is brought into the cleaning assembly by the power device for preheating, and at the same time, use the cleaning brush plate inside the cleaning assembly for cleaning; realize the clogging removal of the rotary air preheater and ensure the safe and stable operation of the rotary air preheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic structural diagram of the blockage clearing device for a rotary air preheater in an embodiment of the present invention; Figure 2 Schematic structural diagram of the air guide hood assembly in an embodiment of the present invention; Figure 3 Schematic assembly structural diagram of the preheating assembly, air guiding and cleaning assembly, and cleaning assembly in an embodiment of the present invention; Figure 4 is Figure 3 Schematic structural diagram after flipping; Figure 5 Schematic structural diagram of the air guiding and cleaning member in an embodiment of the present invention; Figure 6 Schematic structural diagram of the unit air guiding and cleaning member in an embodiment of the present invention; Figure 7 Schematic structural diagram of the air guiding and cleaning plate in an embodiment of the present invention; Figure 8 Schematic structural diagram of the chain link in an embodiment of the present invention.

[0020] In the drawings, the list of components represented by each reference numeral is as follows: 100 - air guide hood assembly; air guide hood 110, exhaust fan 120, reinforcement frame 130; 200 - preheating assembly; 300 - air guiding and cleaning assembly; side plate 310, side frame 320, air collecting cavity 330, air guiding and cleaning member 340; elastic connection belt 341, unit air guiding and cleaning member 342; air guiding and cleaning plate 3421, chain link 3422, air guiding hole 3423; 400 - cleaning assembly. Detailed implementation manners

[0021] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The specific implementation of the present invention will be described in detail below in conjunction with specific embodiments.

[0022] In the embodiment of the present invention, as Figure 1 shown: A blockage clearing device for a rotary air preheater, comprising: The air guiding and cleaning assembly 300 is installed on the main body of the rotary air preheater. Regarding the "rotary air preheater", it should be noted that the rotary air preheater is a prior art, and its detailed structure can be obtained from existing literature and periodicals. It can also be directly purchased on the market, or its components can be purchased on the market and assembled, etc. It is not what the present invention aims to protect and will not be elaborated in detail here. The preheating assembly 200 is assembled at one end of the air guiding and cleaning assembly 300 for providing heat preservation for the air guiding and cleaning assembly 300. Summarizing the above situation, it can be understood that: before the air guiding and cleaning assembly 300 receives flue gas, the preheating assembly 200 is used to heat and keep the air guiding and cleaning assembly 300 warm, so as to make the air guiding and cleaning assembly 300 always higher than the acid dew point temperature and the ammonium bisulfate dew point temperature, preventing the formation of ammonium bisulfate and its adhesion with the ash in the soot from blocking the heat exchange elements of the rotary air preheater. The cleaning assembly 400 is assembled at the other end of the air guiding and cleaning assembly 300. A power device is installed inside the cleaning assembly 400, and the power device is used to drive the air guiding and cleaning assembly 300 to rotate in a closed loop. After the air guiding and cleaning assembly 300 receives flue gas, it is carried into the interior of the cleaning assembly 400 by the power device for preheating, and at the same time, the cleaning plate inside the cleaning assembly 400 is used for cleaning. Regarding the "heating methods of the cleaning assembly 400 and the preheating assembly 200", it should be noted that the heating methods of the cleaning assembly 400 and the preheating assembly 200 are both prior arts, and their detailed structures can be obtained from existing literature and periodicals. They can also be directly purchased on the market, or their components can be purchased on the market and assembled, etc. For example, adding electric heating sheets or electric heating wires, etc. They are not what the present invention aims to protect and will not be elaborated in detail here. To sum up: before the air guiding and cleaning assembly 300 receives flue gas, the preheating assembly 200 is used to heat and keep the air guiding and cleaning assembly 300 warm, so as to make the air guiding and cleaning assembly 300 always higher than the acid dew point temperature and the ammonium bisulfate dew point temperature when receiving flue gas, preventing the formation of ammonium bisulfate and its adhesion with the ash in the soot from blocking the heat exchange elements of the rotary air preheater. After the air guiding and cleaning assembly 300 receives flue gas, it is carried into the interior of the cleaning assembly 400 by the power device for preheating, and at the same time, the cleaning plate inside the cleaning assembly 400 is used for cleaning. The blockage of the rotary air preheater is removed, ensuring the safe and stable operation of the rotary air preheater.

[0023] In the embodiment of the present invention, as Figure 3 and Figure 4 shown: The air guiding and cleaning assembly 300 includes: The air guiding and cleaning member 340, the air guiding and cleaning member 340 is in a head-to-tail closed-loop shape for receiving soot. Side plate 310, which is installed on the side edge of one side of the air guiding and cleaning member 340; Side frame 320, which is installed on the side edge of the other side of the air guiding and cleaning member 340.

[0024] In the embodiment of the present invention, as Figure 3 and Figure 4 shown: The air guiding and cleaning assembly 300 further includes an air collecting cavity 330, and the air collecting cavity 330 is located in the space surrounded by the side plate 310, the side frame 320 and the air guiding and cleaning member 340.

[0025] Furthermore, as Figure 2 and Figure 3 shown: An air guiding cover assembly 100 is installed on the side frame 320, and the air guiding cover assembly 100 is communicated with the air collecting cavity 330; the air guiding cover assembly 100 is detachably assembled with the side frame 320.

[0026] In the embodiment of the present invention, as Figure 2 and Figure 3 shown: The air guiding cover assembly 100 includes: Reinforcement frame 130, which is detachably installed on the side frame 320 through a plurality of screws; Air guiding cover 110, which is in a single-opening shape, and the single opening of the air guiding cover 110 is inserted inside the reinforcement frame 130 and is integrally fixed with the reinforcement frame 130; A plurality of exhaust fans 120, and the plurality of exhaust fans 120 are all detachably installed on the air guiding cover 110; the plurality of exhaust fans 120 are equally spaced along the main body direction of the air guiding cover 110.

[0027] Regarding the "exhaust fan 120": The exhaust fan 120 and the electrified wiring method of the exhaust fan 120 are both prior arts. Its detailed structure can be known from existing literature and periodicals, and it can also be directly purchased on the market, or the components can be purchased on the market for composition, etc.; it is not what the present invention intends to protect and will not be elaborated in detail here.

[0028] In the embodiment of the present invention, as Figure 3 and Figure 4 shown: The air guiding and cleaning member 340 is movably assembled with the side plate 310 and the side frame 320; one ends of the side plate 310 and the side frame 320 are fixed on the cleaning assembly 400, and the other ends are fixed on the preheating assembly 200.

[0029] In the embodiment of the present invention, the power device includes a driving motor, a rotating shaft is fixed on the output shaft of the driving motor, a driving gear is fixed on the rotating shaft, and the driving gear is power-transmitted to the air guiding and cleaning assembly 300 to drive the air guiding and cleaning assembly 300 to rotate in a closed loop.

[0030] Regarding the "drive motor", it should be noted that the drive motor and the power supply wiring method of the drive motor are both prior arts. Its detailed structure can be obtained from existing literature and periodicals, and it can also be directly purchased on the market, or components can be purchased on the market for assembly, etc. It is not what the present invention aims to protect and will not be elaborated in detail here.

[0031] In an embodiment of the present invention, the cleaning plate includes a plate body and a hydraulic telescopic rod. One end of the hydraulic telescopic rod is installed on the plate body, and the other end is installed inside the cleaning assembly 400; bristles are laid on the plate body.

[0032] Regarding the "hydraulic telescopic rod", it should be noted that the hydraulic telescopic rod is a prior art. Its detailed structure can be obtained from existing literature and periodicals, and it can also be directly purchased on the market, or components can be purchased on the market for assembly, etc. It is not what the present invention aims to protect and will not be elaborated in detail here.

[0033] In an embodiment of the present invention, as Figure 5 , Figure 6 and Figure 8 shown: The air guiding and cleaning assembly 300 includes a plurality of unit air guiding and cleaning members 342, and the plurality of unit air guiding and cleaning members 342 are rotatably connected to each other; the unit air guiding and cleaning member 342 includes an air guiding and cleaning plate 3421 and a chain link 3422. There are two chain links 3422, which are distributed at both ends of the air guiding and cleaning plate 3421; the chain links 3422 on the plurality of unit air guiding and cleaning members 342 are connected to each other to form a complete closed-loop chain, and the chain is power-driven and connected to a power device.

[0034] In an embodiment of the present invention, as Figure 5 and Figure 7 shown: The air guiding and cleaning assembly 300 further includes a plurality of elastic connection bands 341, and the plurality of elastic connection bands 341 are sequentially distributed between the air guiding and cleaning plates 3421 on the plurality of unit air guiding and cleaning members 342; a plurality of air guiding holes 3423 are formed on the air guiding and cleaning plate 3421, and the plurality of air guiding holes 3423 are distributed in multiple rows and multiple columns on the air guiding and cleaning plate 3421.

[0035] For the denitration device installed upstream of the rotary air preheater, ammonia escape will occur during operation. When ammonium bisulfate flows with the flue gas to the cold end of the downstream rotary air preheater, the temperature will usually be lower than its dew point temperature, so condensation occurs and adheres to the surface of the heat exchange elements of the rotary air preheater. The clogging removal device of the rotary air preheater of the present invention can achieve: Before the air guiding and cleaning assembly 300 receives the flue gas, the preheating assembly 200 is used to heat and keep the air guiding and cleaning assembly 300 warm, so as to ensure that the air guiding and cleaning assembly 300 is always higher than the acid dew point temperature and the ammonium bisulfate dew point temperature when receiving the flue gas, preventing the formation of ammonium bisulfate and its adhesion with the ash in the soot from blocking the heat exchange elements of the rotary air preheater; after the air guiding and cleaning assembly 300 receives the flue gas, it is brought into the interior of the cleaning assembly 400 by the power device for preheating, and at the same time, the cleaning plate inside the cleaning assembly 400 is used for cleaning; the blockage of the rotary air preheater is removed, ensuring the safe and stable operation of the rotary air preheater.

[0036] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the ratio relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0037] In the description of the present invention, although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0038] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent substitutions on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A clogging removal device for a rotary air preheater, characterized in that Including: An air guiding and cleaning assembly (300), which is installed on the main body of the rotary air preheater; A preheating assembly (200), which is assembled at one end of the air guiding and cleaning assembly (300) and is used to provide heat preservation for the air guiding and cleaning assembly (300); A cleaning assembly (400), which is assembled at the other end of the air guiding and cleaning assembly (300). A power device is installed inside the cleaning assembly (400), and the power device is used to drive the air guiding and cleaning assembly (300) to rotate in a closed loop. After the air guiding and cleaning assembly (300) receives flue gas, it is brought into the interior of the cleaning assembly (400) by the power device for preheating, and at the same time, a cleaning brush plate inside the cleaning assembly (400) is used for cleaning.

2. The plugging removal device for a rotary air preheater according to claim 1, wherein The air guiding and cleaning assembly (300) includes: An air guiding and cleaning member (340), which is in a closed loop at the head and tail and is used to receive soot; Side plates (310), which are installed on the side edges of one side of the air guiding and cleaning member (340); Side frames (320), which are installed on the side edges of the other side of the air guiding and cleaning member (340).

3. The clogging removal device for a rotary air preheater according to claim 2, characterized in that, The air guiding and cleaning assembly (300) further includes an air collecting chamber (330), and the air collecting chamber (330) is located in the space surrounded by the side plates (310), the side frames (320) and the air guiding and cleaning member (340).

4. A clogging removal device for a rotary air preheater according to claim (3), characterized in that, An air guiding hood assembly (100) is installed on the side frame (320), and the air guiding hood assembly (100) is communicated with the air collecting chamber (330); the air guiding hood assembly (100) is detachably assembled on the side frame (320).

5. The plugging removal device for a rotary air preheater according to claim 4, wherein The air guiding hood assembly (100) includes: A reinforcing frame (130), which is detachably installed on the side frame (320) by a plurality of screws; An air guiding hood (110), which is in a single-opening shape. The single opening of the air guiding hood (110) penetrates inside the reinforcing frame (130) and is integrally fixed with the reinforcing frame (130); A plurality of exhaust fans (120), and the plurality of exhaust fans (120) are all detachably installed on the air guiding hood (110); the plurality of exhaust fans (120) are equally spaced along the main body direction of the air guiding hood (110).

6. The clogging removal device for a rotary air preheater according to claim 2, wherein, The air guiding and cleaning member (340) is movably assembled with the side plates (310) and the side frames (320); one ends of the side plates (310) and the side frames (320) are fixed on the cleaning assembly (400), and the other ends are fixed on the preheating assembly (200).

7. A clogging clearing device for a rotary air preheater according to any one of claims 1-6, characterized in that, The power device includes a driving motor. A rotating shaft is fixed on the output shaft of the driving motor, and a driving gear is fixed on the rotating shaft. The driving gear is power-transmitted to the air guiding and cleaning assembly (300) and drives the air guiding and cleaning assembly (300) to rotate in a closed loop.

8. A clogging clearing device for a rotary air preheater according to any one of claims 1-6, characterized in that, The cleaning brush plate includes a plate body and a hydraulic telescopic rod. One end of the hydraulic telescopic rod is installed on the plate body, and the other end is installed inside the cleaning assembly (400); bristles are laid on the plate body.

9. A clogging removal device for a rotary air preheater according to any one of claims 1-6, characterized in that, The air guiding and cleaning assembly (300) includes a plurality of unit air guiding and cleaning members (342), and the plurality of unit air guiding and cleaning members (342) are rotatably connected to each other; the unit air guiding and cleaning member (342) includes an air guiding and cleaning plate (3421) and a chain link (3422), and there are two chain links (3422) which are distributed at both ends of the air guiding and cleaning plate (3421); the chain links (3422) on the plurality of unit air guiding and cleaning members (342) are connected to each other to form a complete closed-loop chain, and the chain is power-driven and connected to the power device.

10. A clogging clearing device for a rotary air preheater according to claim 9, characterized in that, The air guiding and cleaning assembly (300) further includes a plurality of elastic connection bands (341), and the plurality of elastic connection bands (341) are sequentially distributed between the air guiding and cleaning plates (3421) on the plurality of unit air guiding and cleaning members (342); a plurality of air guiding holes (3423) are formed in the air guiding and cleaning plate (3421), and the plurality of air guiding holes (3423) are distributed in multiple rows and multiple columns on the air guiding and cleaning plate (3421).

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