Pulse type high-pressure blowing cleaning device for air pre-heater

Abstract

The utility model provides a pulse type high-pressure air blowing cleaning device for an air pre-heater. The pulse type high-pressure air blowing cleaning device comprises an air source, a control cabinet, a guide rail, a reciprocating type linear driving mechanism, an air blowing cleaning mechanism and a joint air conveying pipeline. The guide rail is used for being installed on an end shell of the air pre-heater, the extending direction of the guide rail is in the radial direction of a heat exchange piece in the air pre-heater, and the whole guide rail is located at the axial outer end of the heat exchange piece in the air pre-heater. The blowing cleaning mechanism is slidably mounted on the guide rail, a plurality of high-pressure nozzles are distributed on the blowing cleaning mechanism, and the high-pressure nozzles are arranged towards the heat exchange pieces; the reciprocating type linear driving mechanism is used for driving the blowing cleaning mechanism to do reciprocating type linear motion along the guide rail; the air source is communicated with the air blowing cleaning mechanism through the control cabinet and the joint air conveying pipeline and used for providing pulse type compressed air. The pulse type high-pressure blowing cleaning device for the air pre-heater has the advantages that the steam consumption is reduced, and the moisture content of flue gas in the air pre-heater is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to air preheater cleaning technical field, specifically speaking, relate to a kind of for air preheater's pulse type high pressure blow cleaning device. BACKGROUND

[0002] Air preheater is a kind of preheating equipment to improve the heat exchange performance of boiler, reduce heat loss.The function 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 dissipation fin, and preheat the air to a certain temperature.

[0003] The most common problem of air preheater is ash blocking, so air preheater needs to be cleaned frequently.

[0004] Specifically, air preheater will contact flue gas discharged from boiler and particle dust carried therein during work, and dust accumulation for a long time will form ash blocking.Meanwhile, sulfur dioxide gas carried by flue gas discharged from base boiler corrodes air preheater, and the corroded material will also form ash blocking of air preheater.After air preheater is blocked, the heat transfer area is seriously blocked, which will cause significant decrease of heat exchange effect, increase of flue gas temperature and other consequences, affecting the safe and economic operation of unit.

[0005] At present, power plants generally use ash blower to clean up for ash blocking of air preheater, but ash blower mainly uses steam to blow ash, which increases steam consumption and water content of flue gas in air preheater.

[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 deficiency of prior art, and provides a pulse type high pressure blow cleaning device for air preheater, which reduces steam consumption and water content of flue gas in air preheater.

[0008] In order to achieve the above purpose, the utility model adopts the following technical scheme: a pulse type high pressure blow cleaning device for air preheater, comprising air source, control cabinet, guide rail, reciprocating linear drive mechanism, blow cleaning mechanism and joint gas pipeline.

[0009] The guide rail is used to be installed on the end shell of air preheater, the extension direction of the guide rail is along the radial direction of heat transfer fin in air preheater, and the guide rail is located at the axial outer end of heat transfer fin in air preheater as a whole.

[0010] The blow cleaning mechanism is slidably installed on the guide rail, a plurality of high pressure nozzles are distributed on the blow cleaning mechanism, and the high pressure nozzles are arranged towards the heat transfer fin.

[0011] The reciprocating linear driving mechanism is used for driving the blowing cleaning mechanism to make reciprocating linear motion along the guide rail.

[0012] The air source is communicated with the blowing cleaning mechanism through a control cabinet and a joint air conveying pipeline, and is used for providing pulse compressed air.

[0013] According to the above, the blowing cleaning mechanism comprises at least one mother pipe, and the mother pipe is arranged in a circular arc shape, and the circular arc shape of the mother pipe is matched with the outer contour of the heat exchange fin.

[0014] According to the above, the joint air conveying pipeline is a rigid mechanical arm structure, and comprises at least two air path pipelines which are communicated through rotary joints, the first end of the joint air conveying pipeline is communicated with the air source through the control cabinet, and the tail end of the joint air conveying pipeline is communicated with the air inlet of the mother pipe through the rotary joint.

[0015] According to the above, the mother pipe is greater than two, and the mother pipes are communicated through air pipes.

[0016] According to the above, the air pipe or the mother pipe walks on the guide rail through a guide wheel structure, the guide wheel structure comprises guide wheel groups which embrace and clamp the guide rail and guide wheel seats, and the guide wheel seats are fixed with the mother pipe.

[0017] According to the above, the reciprocating linear driving mechanism comprises a lead screw transmission mechanism and a driving motor, a nut is arranged on the mother pipe corresponding to the lead screw transmission mechanism, the lead screw transmission mechanism is matched with the nut, and the blowing cleaning mechanism is driven to make reciprocating linear motion along the guide rail.

[0018] According to the above, a dustproof sleeve pipe is arranged outside the lead screw of the lead screw transmission mechanism, and the dustproof sleeve pipe is fixedly connected with the blowing cleaning mechanism.

[0019] According to the above, two sets of the guide rail, the reciprocating linear driving mechanism, the blowing cleaning mechanism and the joint air conveying pipeline are symmetrically arranged on the air preheater corresponding to the two ends of the heat exchange fin, and are controlled by the same control cabinet and supplied with air by the same air source.

[0020] According to the above, a gas heating mechanism is arranged in the air path structure between the air source and the blowing cleaning device, and is used for heating the gas flow.

[0021] Compared with the prior art, the utility model has substantial features and progress, specifically, the blowing cleaning mechanism capable of reciprocating motion is designed, a high-pressure air source is introduced from outside, the pulse blowing mode is adopted to ensure the gas pressure, the heat exchange fin is gradually swept by the sweeping gas flow at a single point, the sweeping area at each moment is much smaller than that in the large-scale sweeping of a large amount of steam, the gas pressure is guaranteed, the cleaning effect of the sweeping is guaranteed, the reciprocating motion is used to compensate for the defect of small single-point sweeping area, the coverage range is guaranteed, and the overall sweeping and cleaning effect is better.

[0022] Further, the mother pipe can be provided with multiple groups, and the specific number can be determined according to the gas source, and the gas pressure required to meet the purging.

[0023] Further, the gas supply pipeline adopts a rigid structure mechanical arm structure with a rotary joint, which can ensure the gas pressure and flexibility.

[0024] The reciprocating motion mode adopts a cooperation mode of a lead screw transmission and a track guide, and the linear motion ability is better, and in order to prevent dust pollution, a dust sleeve is arranged to ensure the health and safety of the lead screw. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structure schematic view of the pulse type high pressure blowing cleaning device for the air preheater in the utility model.

[0026] Figure 2 is a structure schematic view of the pulse type high pressure blowing cleaning device for the air preheater in the utility model.

[0027] Figure 3 is a structure schematic view of the joint gas supply pipeline.

[0028] Figure 4 is a structure schematic view of the pulse type high pressure blowing cleaning device for the air preheater in the utility model.

[0029] Figure 5 is a structure schematic view of the blowing cleaning mechanism.

[0030] In the figure: 1. guide rail; 2. reciprocating linear drive mechanism; 3. blowing cleaning mechanism; 4. joint gas supply pipeline; 5. air preheater; 6. heat exchange fin; 31. high pressure nozzle; 32. mother pipe; 33. air pipe; 34. guide structure; 35. dust sleeve. 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 A pulse type high pressure blowing cleaning device for an air preheater, comprising a gas source (not shown in the figure), a control cabinet (not shown in the figure), a guide rail 1, a reciprocating linear drive mechanism 2, a blowing cleaning mechanism 3 and a joint gas supply pipeline 4.

[0033] The air source can adopt a gas tank combined with a compressor, the air inlet and air outlet parameters of the compressor are adjusted, or a turbine forced vibration method or a gas laser pulse method is adopted to control the air inlet flow, so that the air inlet flow generates a pulse air flow, the pulse air flow has better impact force, and the substances deposited and attached to the surface of the heat exchange fin can be blown down.

[0034] The guide rail 1 is used to be mounted on the end shell of the air preheater 5, the extension direction of the guide rail 1 is along the radial direction of the heat exchange fin 6 in the air preheater, and the guide rail 1 is located at the axial outer end of the heat exchange fin 6 in the air preheater 5.

[0035] The blowing and cleaning mechanism 3 is slidably mounted on the guide rail 1, a plurality of high-pressure nozzles 31 are distributed on the blowing and cleaning mechanism 3, the high-pressure nozzles 31 are arranged towards the heat exchange fin 6, and are used for blowing the high-pressure nozzles 31. In the embodiment, the blowing and cleaning mechanism 3 includes at least one mother pipe, as shown in the figure, two mother pipes 32 are arranged, the mother pipes 32 are communicated through an air pipe 33, the mother pipes 32 are arranged in a circular arc shape, and the circular arc shape of the mother pipes 32 matches the outer contour of the heat exchange fin 6. The air pipe 33 or the mother pipe 32 runs on the guide rail through a guide wheel structure 34, the guide wheel structure 34 includes a guide wheel group clamping the guide rail and a guide wheel seat, and the guide wheel seat is fixed with the mother pipe.

[0036] The reciprocating linear driving mechanism 2 is used to drive the blowing and cleaning mechanism 3 to make reciprocating linear motion along the guide rail 1. In the embodiment, the reciprocating linear driving mechanism 2 includes a screw rod transmission mechanism and a driving motor, a screw nut is arranged on the mother pipe 32 corresponding to the screw rod transmission mechanism, and the screw rod transmission mechanism cooperates with the screw nut to drive the blowing and cleaning mechanism 3 to make reciprocating linear motion along the guide rail 1.

[0037] Since a large amount of dust is easily generated in the blowing and cleaning process and is easily adhered to the outer surface of the screw rod, in the embodiment, a dustproof sleeve 35 is arranged on the outer surface of the screw rod of the screw rod transmission mechanism, and the dustproof sleeve 35 is fixedly connected with the blowing and cleaning mechanism 3.

[0038] The air source is communicated with the blowing and cleaning mechanism 3 through a control cabinet and a joint gas pipeline 4, and is used to provide pulse compressed air. Specifically, the joint gas pipeline 4 is a rigid mechanical arm structure, includes at least two gas pipeline pipes which are communicated through rotary joints, the leading end of the joint gas pipeline is communicated with the air source through the control cabinet, and the tail end of the joint gas pipeline is communicated with the air inlet of the mother pipe through the rotary joint.

[0039] In a preferred embodiment, a gas heating mechanism is arranged in the gas pipeline structure between the air source and the blowing and cleaning device, which is used to heat the air flow and improve the cleaning efficiency.

[0040] Working principle:

[0041] The pulse type high pressure blowing cleaning device for the air preheater is installed at one end or both ends of the air preheater, after installation, the nozzle is directed to the end of the heat exchange sheet, and the heat exchange sheet is blown.

[0042] After the device is started, the high pressure pulse airflow enters the blowing cleaning mechanism 3 through the joint gas conveying pipeline 4, the reciprocating linear driving mechanism 2 drives the blowing cleaning mechanism 3 to locally and gradually blow the heat exchange sheet, at the same time, the heat exchange sheet of the air preheater rotates synchronously, so that all the heat exchange sheets are cleaned in place.

[0043] Due to the adoption of the high pressure pulse type fixed point blowing cleaning mode, the local air pressure can be effectively ensured, and the blowing cleaning effect is ensured, at the same time, the reciprocating motion mode is used to solve the coverage area problem, and the problems of large water content and large steam consumption caused by the blowing cleaning of a large amount of steam in the traditional scheme are solved.

[0044] Finally, it should be noted that: the above examples are only used to illustrate the technical scheme of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific implementation of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical scheme of the utility model, all should be covered in the technical scheme range of the utility model claimed by the utility model.

Claims

1. A pulse type high pressure blow cleaning device for an air preheater, characterized by: The air source, the control cabinet, the guide rail, the reciprocating linear driving mechanism, the blowing cleaning mechanism and the joint air conveying pipeline are included. The guide rail is installed on the end shell of the air preheater, and the extension direction of the guide rail is along the radial direction of the heat exchange fins in the air preheater. The blowing cleaning mechanism is slidably installed on the guide rail, and a plurality of high-pressure nozzles are distributed on the blowing cleaning mechanism and face the heat exchange fins. The reciprocating linear driving mechanism is used for driving the blowing cleaning mechanism to make reciprocating linear motion along the guide rail. The air source is connected with the blowing cleaning mechanism through the control cabinet and the joint air conveying pipeline, and is used for providing pulse compressed air.

2. A pulse -type high pressure air scouring device for an air preheater according to claim 1, characterized in that: The blowing cleaning mechanism includes at least one mother pipe, and the mother pipe is arranged in a circular arc shape.

3. A pulse -type high pressure air scour for an air preheater according to claim 2, characterized in that: The joint air conveying pipeline is a rigid mechanical arm structure, and includes at least two air path pipelines connected through rotary joints.

4. A pulse -type high pressure air scouring device for an air preheater according to claim 3, characterized in that: The mother pipe is greater than two, and the mother pipes are connected through the air pipe.

5. A pulse-aided high pressure air scouring device for an air preheater according to claim 4, characterized in that: The air pipe or the mother pipe runs on the guide rail through the guide wheel structure.

6. A pulse-convecting high pressure air scour for an air preheater according to claim 5, characterized in that: The reciprocating linear driving mechanism includes a lead screw transmission mechanism and a driving motor.

7. A pulse- combusting high pressure air scouring device for an air preheater according to claim 6, characterized in that: The dustproof sleeve is arranged outside the lead screw of the lead screw transmission mechanism.

8. A pulse -type high pressure air scour for an air preheater according to claim 7, characterized in that: Two sets of the guide rail, the reciprocating linear driving mechanism, the blowing cleaning mechanism and the joint air conveying pipeline are symmetrically arranged on the air preheater corresponding to the two ends of the heat exchange fins.

9. The pulse- combusting high pressure gas purging device for an air preheater according to claim 8, characterized in that: A gas heating mechanism is arranged in the gas path structure from the air source to the blowing cleaning device.

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