Air blowing device for cleaning air pre-heater

Abstract

The utility model provides an air blowing device for cleaning an air pre-heater. The air blowing device comprises the air pre-heater, a main pipe and a flow guide cover. The main pipe is arranged on the axial side of a heat exchange piece of the air pre-heater, the main pipe is arranged to be in an arc shape, air outlet holes are densely distributed in the side, adjacent to the air pre-heater, of the main pipe, and an air inlet is further formed in the main pipe and used for being externally connected with a high-pressure air source. The flow guide cover is arranged on the outer side of the main pipe in a covering mode, a flow guide groove which is the same as the main pipe in shape is formed in the flow guide cover, and the flow guide groove faces the axial direction of the air pre-heater heat exchange pieces. The blowing device for cleaning the air pre-heater has the advantages that the blowing time of the heat exchange fins of the air pre-heater is prolonged, the cleaning effect of ash clogging of the air pre-heater is improved, and the heat exchange efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the cleaning technical field of air preheater, specifically, relate to a kind of for the blowing device of air preheater cleaning. BACKGROUND

[0002] Air preheater is a kind of preheating equipment to improve the heat exchange performance of boiler, reduce heat loss.The role of air preheater is to transfer the heat carried by flue gas discharged from the tail of boiler to the air before entering the boiler through heat sink, and preheat the air to a certain temperature.

[0003] Air preheater will contact flue gas discharged from boiler when working, and the particle dust carried in flue gas will form dust blocking after long-time accumulation.In addition, when sulfur dioxide gas is carried in flue gas discharged from base boiler, air preheater will also be corroded, and the corroded material will also form dust blocking of air preheater.

[0004] When dust blocking reaches a certain degree, the heat transfer area of air preheater is seriously blocked, which will cause significant decrease in heat exchange effect, increase in exhaust gas temperature and other consequences, and affect the safe and economic operation of unit.

[0005] Currently, for the dust blocking phenomenon of air preheater, power plants generally use soot blower for blowing, but the jet mechanism of the currently used soot blower is to open jet hole on a single mother pipe, and the soot blower is fixed on the shell of air preheater, and the blowing process relies on the rotation of heat transfer sheet of air preheater to realize the blowing of the whole heat transfer sheet through jet hole.In this way, the blowing time of heat transfer sheet is short, the cleaning effect of air preheater dust blocking is poor, and it is very limited to solve the problem of air preheater dust blocking, which greatly affects the economic performance of generator set.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. CONTENT OF UTILITY MODEL

[0007] The utility model aims at the deficiencies of prior art, and provides a blowing device for air preheater cleaning, which increases the blowing time of heat transfer sheet of air preheater, improves the cleaning effect of air preheater dust blocking, and improves heat exchange efficiency.

[0008] In order to achieve the above purpose, the utility model adopts the following technical scheme: a blowing device for air preheater cleaning, comprising air preheater, mother pipe and flow guide cover.

[0009] The mother pipe is arranged on the axial side of heat transfer sheet of air preheater, the mother pipe is arranged in arc shape, the side adjacent to air preheater of the mother pipe is densely provided with air outlet hole, and air inlet hole is also opened on the mother pipe for external connection of high-pressure gas source.

[0010] The fairing is arranged outside the mother pipe, a fairing groove with the same shape as the mother pipe is formed in the fairing, and the fairing groove is oriented along the axial direction of the heat exchange fin of the air preheater.

[0011] As described above, the mother pipe comprises a first mother pipe, a second mother pipe and a vent pipe, the length of the first mother pipe is greater than the length of the second mother pipe, the first mother pipe and the second mother pipe constitute a concentric circular arc, and the first mother pipe and the second mother pipe are connected and fixed by the vent pipe and internally communicated.

[0012] The first mother pipe and the second mother pipe are densely provided with the air outlet holes on the side adjacent to the air preheater, and the fairing comprises a first fairing and a second fairing which are arranged outside the first mother pipe and the second mother pipe respectively.

[0013] The first mother pipe is provided with an air inlet.

[0014] As described above, the three-way pipe joint is further provided, the inlet of the three-way pipe joint is connected with a high-pressure gas source, the other two outlets of the three-way pipe joint are connected with the first mother pipe from the middle part of the first mother pipe, so that two air flows are formed in the first mother pipe from the middle part to the two ends.

[0015] The two ends of the first mother pipe are connected with the two ends of the second mother pipe by the two vent pipes and are internally communicated.

[0016] As described above, the central region of the three-way pipe joint is hollow, a nut is arranged in the hollow region, a lead screw mechanism and a guide mechanism are arranged on the air preheater corresponding to the nut, the lead screw mechanism and the guide mechanism are arranged along the radial direction of the air preheater, and the entire mother pipe can be moved along the radial direction of the air preheater by adjusting the lead screw mechanism.

[0017] As described above, the guide mechanism comprises two parallel sliding rails, and the two vent pipes are clamped and slidably matched with the two sliding rails by a clamping piece.

[0018] As described above, the second mother pipe is also provided with an air inlet.

[0019] As described above, the two vent pipes are parallel to each other.

[0020] As described above, the first fairing and the second fairing are in the shape of a circular arc which is adapted to the first mother pipe and the second mother pipe.

[0021] The utility model discloses relative prior art has substantial characteristics and progress, specifically speaking, the utility model designs the female pipe as arc shape, and the air outlet hole also is arc shape distribution, and the fairing can prevent airflow dispersion, guarantees airflow intensity, when the heat exchange sheet of air preheater rotates, in the fixed angle range of arc surface, the heat exchange sheet can be blown to in, increases the time of the heat exchange sheet of air preheater and is swept, thereby improves the cleaning effect of air preheater, promotes the heat exchange efficiency, further promotes the economic performance of generator unit.

[0022] In addition, the female pipe can be further designed as two female pipes, which are connected by the air pipe, to further increase the coverage area of the heat exchange sheet.

[0023] Furthermore, the entire female pipe is supplied with air from the middle to the two ends by the three-way pipe joint due to the long inner pipe path, to ensure the airflow intensity.

[0024] The installation position of the entire female pipe can also be adjusted by the lead screw, so that all areas of the heat exchange sheet are swept in place. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the structure diagram of the air blowing device for air preheater cleaning in the utility model.

[0026] Figure 2 is the rear view of the air blowing device for air preheater cleaning in the utility model.

[0027] Figure 3 is the right view of the air blowing device for air preheater cleaning in the utility model.

[0028] Figure 4 is the air pipe joint connection diagram of the air blowing device for air preheater cleaning in the utility model.

[0029] Figure 5 is the installation state diagram of the air blowing device for air preheater cleaning in the utility model.

[0030] In the drawing: 1. air preheater; 2. female pipe; 4. heat exchange sheet; 5. three-way pipe joint; 11. lead screw mechanism; 12. guide mechanism; 21. first female pipe; 22. second female pipe; 23. air pipe; 24. air outlet hole; 31. first fairing; 32. second fairing; 33. flow guide groove; 51. lead screw nut. DETAILED DESCRIPTION

[0031] The technical scheme of the utility model will be described in further detail below through specific embodiments.

[0032] As shown in Figures 1-5 , an air blowing device for air preheater cleaning includes an air preheater 1, a female pipe 2, and a fairing.

[0033] The mother pipe 2 is arranged at the axial side of the heat exchange fin 4 of the air preheater 1, the mother pipe 2 is arranged in a circular arc shape, the side adjacent to the air preheater 1 of the mother pipe 2 is densely provided with the air outlet hole 24, and the air inlet hole is also provided on the mother pipe 2 for external connection of the high-pressure gas source.

[0034] In the embodiment, the mother pipe 2 includes a first mother pipe 21, a second mother pipe 22 and a vent pipe 23, the length of the first mother pipe 21 is greater than the length of the second mother pipe 22, the first mother pipe 21 and the second mother pipe 22 constitute a concentric circular arc, and the first mother pipe 21 and the second mother pipe 22 are connected and fixed through the vent pipe 23 and internally communicated;

[0035] The first mother pipe 21 and the second mother pipe 22 are densely provided with the air outlet hole 24 at the side adjacent to the air preheater 1, and the flow guide cover includes a first flow guide cover 31 and a second flow guide cover 32 which are respectively arranged outside the first mother pipe 21 and the second mother pipe 22; specifically, the flow guide cover is arranged outside the mother pipe, a flow guide groove 33 with the same shape as the mother pipe is formed in the flow guide cover, and the direction of the flow guide groove 33 is the same as the axial direction of the heat exchange fin 4 of the air preheater 1, that is, the direction of the flow guide groove 33 is guaranteed to blow the air flow to the outer end of the heat exchange fin 4.

[0036] In the embodiment, the first flow guide cover 31 and the second flow guide cover 32 are in the shape of a circular arc which is adapted to the first mother pipe 21 and the second mother pipe 22.

[0037] Under the cooperation of the air flow, the air outlet hole of the first mother pipe 21 is used to blow the outer peripheral area of the heat exchange fin 4, the air outlet hole of the second mother pipe 22 is used to blow the inner side area of the heat exchange fin 4, and both of them are in the shape of a circular arc, which can cover a certain angle, so that the heat exchange fin 4 is blown more thoroughly and sufficiently, and the cleaning efficiency is improved.

[0038] Of course, in a more preferred embodiment, the mother pipe can further include a third mother pipe, a fourth mother pipe and the like, by increasing the number of mother pipes, the cleaning area is increased, and the cleaning efficiency is improved.

[0039] The first mother pipe 21 is provided with an air inlet hole, and in the embodiment, a three-way pipe joint 5 is further included, the inlet of the three-way pipe joint 5 is connected with the high-pressure gas source, the other two outlets of the three-way pipe joint 5 are communicated with the first mother pipe 21 from the middle part of the first mother pipe 21, so that two air flows flowing from the middle to the two ends are formed in the first mother pipe 21, the two ends of the first mother pipe 21 are connected with the two ends of the second mother pipe 22 through two vent pipes 23 and are internally communicated, and the two vent pipes 23 are parallel to each other.

[0040] The purpose of the design is to make the air flow power of the inlet air more sufficient, so that the air flow can enter the first mother pipe 21 and the second mother pipe 22 more abundantly, and the pressure of the air flow guided from the air outlet hole is guaranteed to be large enough, and the cleaning effect is improved.

[0041] In this embodiment, the center area of the tee joint 5 is hollow, and a lead screw 51 is installed in the hollow area, and a corresponding lead screw mechanism 11 (shown by a dashed line) and a guide mechanism 12 are installed on the air preheater 1, the lead screw mechanism 11 and the guide mechanism 12 are arranged along the radial direction of the air preheater 1, and by adjusting the lead screw mechanism 11, the entire mother pipe 2 can be adjusted to move along the radial direction of the air preheater 1. Figure 5 In this embodiment, the center area of the tee joint 5 is hollow, and a lead screw 51 is installed in the hollow area, and a corresponding lead screw mechanism 11 (shown by a dashed line) and a guide mechanism 12 are installed on the air preheater 1, the lead screw mechanism 11 and the guide mechanism 12 are arranged along the radial direction of the air preheater 1, and by adjusting the lead screw mechanism 11, the entire mother pipe 2 can be adjusted to move along the radial direction of the air preheater 1.

[0042] Specifically, the guide mechanism 12 includes two parallel sliding rails, and the two air pipes 23 are clamped and slidably connected to the two sliding rails through clamping members.

[0043] The purpose of this scheme is to provide the position adjustment capability of the entire mother pipe, on the one hand, the installation position can be adjusted to blow different areas, on the other hand, a power mechanism can be added to make the cleaning process become a reciprocating blowing and cleaning process along the radial direction, thereby improving the cleaning efficiency.

[0044] In a preferred embodiment, when the size of the mother pipe is too large and the air pressure is insufficient, the second mother pipe is also provided with an air inlet to stabilize the air pressure and ensure the cleaning effect.

[0045] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical scheme of the present application, they should be covered in the technical scheme range of the present application claimed.

Claims

1. A blowing device for air preheater cleaning, characterized by: The air preheater, the mother pipe and the flow guide cover are included. The mother pipe is arranged on the axial side of the heat exchange fin of the air preheater, the mother pipe is arranged in the shape of a circular arc, the side adjacent to the air preheater of the mother pipe is densely provided with the air outlet holes, and the air inlet holes are also arranged on the mother pipe for connecting the high-pressure air source. The flow guide cover is arranged outside the mother pipe, the flow guide groove with the same shape as the mother pipe is formed in the flow guide cover, and the direction of the flow guide groove is the same as the axial direction of the heat exchange fin of the air preheater.

2. The air blowing device for cleaning the air preheater according to claim 1, characterized in that: The mother pipe includes the first mother pipe, the second mother pipe and the air pipe, the length of the first mother pipe is greater than the length of the second mother pipe, the first mother pipe and the second mother pipe constitute a concentric circular arc, and the first mother pipe and the second mother pipe are connected and fixed through the air pipe and internally communicated. The first mother pipe and the second mother pipe are densely provided with the air outlet holes on the side adjacent to the air preheater, and the flow guide cover includes the first flow guide cover and the second flow guide cover which are arranged outside the first mother pipe and the second mother pipe respectively. The air inlet holes are arranged on the first mother pipe.

3. The air blowing device for cleaning the air preheater according to claim 2, characterized in that: The three-way pipe joint is also included, the inlet of the three-way pipe joint is connected with the high-pressure air source, the other two outlets of the three-way pipe joint are connected with the first mother pipe from the middle part of the first mother pipe, so that two air flows are formed in the first mother pipe from the middle to the two ends. The two ends of the first mother pipe are connected with the two ends of the second mother pipe through the two air pipes and internally communicated.

4. The air blowing device for cleaning the air preheater according to claim 3, characterized in that: The central area of the three-way pipe joint is hollow, and the female thread is arranged in the hollow area, the lead screw mechanism and the guide mechanism are arranged on the air preheater corresponding to the female thread, the lead screw mechanism and the guide mechanism are arranged along the radial direction of the air preheater, and the radial movement of the whole mother pipe along the air preheater can be adjusted by adjusting the lead screw mechanism.

5. The air blowing device for cleaning the air preheater according to claim 4, characterized in that: The guide mechanism includes two parallel sliding rails, and the two air pipes are clamped and slidably matched with the two sliding rails through the clamping pieces.

6. The air blowing device for cleaning the air preheater according to claim 2 or 3, characterized in that: The air inlet holes are also arranged on the second mother pipe.

7. The air blowing device for cleaning the air preheater according to claim 6, characterized in that: The two air pipes are parallel to each other.

8. The air blowing device for cleaning the air preheater according to claim 7, characterized in that: The first flow guide cover and the second flow guide cover are in the shape of a circular arc which is adapted to the first mother pipe and the second mother pipe.

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