Heat exchange recovery device of air preheater

Abstract

The utility model relates to the technical field of air preheater heat recovery, and discloses an air preheater heat exchange recovery device which comprises an air preheater body. According to the heat exchange recovery device of the air preheater, through the effect of the heat exchange inner frame, flue gas can preliminarily preheat the heat exchange inner frame after entering, at the moment, the heat exchange outer pipe and the heat conduction pipe can preliminarily conduct heat exchange, then the exhaust path of the flue gas is optimized through combination of the smoke exhaust pipe and the heat conduction pipe, and heat is prevented from being lost at the tail end; meanwhile, the residence time of flue gas in the air preheater body is prolonged, waste caused by direct discharge of heat is reduced, then the flue gas can continuously heat the heat conduction pipe and the heat exchange inner frame, the heat is transferred to a heat exchange medium in the heat exchange inner pipe through the pipe wall of the heat conduction pipe, heat gradient transfer is achieved, and a multi-layer heat exchange structure is formed; and then through the linkage design of the water outlet pipe, the temperature sensor and the electromagnetic valve, dynamic recovery of waste heat is achieved by monitoring the drainage temperature in real time and adjusting the flow.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air preheater heat recovery, in particular to an air preheater heat recovery device. BACKGROUND

[0002] The air preheater is a heating surface through which flue gas in the tail flue of a boiler preheats air entering the boiler to a certain temperature through internal heat radiating fins. The air preheater is widely applied to power station boilers and industrial boilers, and through recovery of flue gas waste heat, the thermal efficiency and energy utilization efficiency of the boiler are significantly improved.

[0003] The existing patent (publication number: CN119594421A) discloses an air preheater heat recovery device. The device comprises an air preheater body, a flue gas filter, a fan, a preheating outer frame body, a heat preservation shell plate and other components.

[0004] However, the prior art has certain limitations in actual use. In the working process, the flue gas is directly discharged from the inside of the heat exchange cavity after heat exchange, which causes the flue gas to still carry a large amount of heat that is not fully utilized when being discharged. The heat is wasted without being further recovered, resulting in insufficient energy utilization and greatly reducing the practicability of the whole device. CONTENT OF THE INVENTION

[0005] In view of the deficiencies of the prior art, the application provides an air preheater heat recovery device, which has the advantages of optimizing the discharge path of flue gas, avoiding heat loss at the end, prolonging the residence time of flue gas in the air preheater body and reducing the waste of direct heat discharge, and solves the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: an air preheater heat recovery device, comprising an air preheater body, a heat exchange inner frame fixedly connected inside the air preheater body, an air inlet pipe fixedly connected to one side of the heat exchange inner frame, an air outlet pipe fixedly connected to the other side of the heat exchange inner frame, a filter assembly arranged on the outer side of the air inlet pipe, a heat exchange outer pipe fixedly installed on the inner side of the air preheater body, a heat conduction pipe fixedly connected to the inner side of the heat exchange inner frame, a heat exchange inner pipe fixedly connected to the outer side of the heat conduction pipe, the heat exchange outer pipe fixedly connected to the heat exchange inner pipe through the outer side of the heat exchange inner frame, a smoke exhaust pipe fixedly connected to the inner side of the heat conduction pipe, two symmetrical smoke inlets arranged on the outer side of the left end of the heat conduction pipe, a fan arranged on the inner side of the smoke exhaust pipe, a water outlet pipe fixedly connected to one end of the heat exchange inner pipe, a temperature sensor fixedly installed on the outer side of the water outlet pipe, and an electromagnetic valve fixedly installed on the outer side of the water outlet pipe.

[0007] Through the above scheme, through the action of setting the heat exchange inner frame, the flue gas can be preliminarily preheated after entering the heat exchange inner frame, at this time the heat exchange outer pipe and the heat conducting pipe can preliminarily exchange heat, and then the combination of the exhaust pipe and the heat conducting pipe optimizes the exhaust path of the flue gas, avoids the loss of heat at the end, prolongs the residence time of the flue gas in the air preheater main body, reduces the waste of direct heat discharge, and then the flue gas can continuously heat the heat conducting pipe and the heat exchange inner frame. The heat is transferred to the heat exchange medium in the heat exchange inner pipe through the pipe wall of the heat conducting pipe, realizes gradient heat transfer, forms a multi-layer heat exchange structure, and then the linkage design of the water outlet pipe, the temperature sensor and the electromagnetic valve realizes real-time monitoring of the water temperature and adjustment of the flow, and realizes dynamic recovery of waste heat.

[0008] Further, the inner side of the exhaust pipe is fixedly connected with a fixed support, and the outer surface of the fan is fixedly installed on the inner side of the fixed support.

[0009] Through the above scheme, through the action of setting the fixed support, the stability of the exhaust pipe operation is improved, thereby enhancing the flow stability of the flue gas in the exhaust pipe, avoiding the heat exchange efficiency reduction caused by turbulence.

[0010] Further, the outer side of the heat exchange outer pipe is fixedly installed with a booster pump, and the outer surface of the booster pump is fixedly installed on the outer side of the air preheater main body.

[0011] Through the above scheme, through the action of setting the booster pump, the flowability of the water flow between the heat exchange outer pipe and the heat exchange inner pipe is strengthened, and the water after heat exchange can be stably discharged.

[0012] Further, the air preheater main body is provided with protective side frames on both sides, the outer side of the water outlet pipe extends to the outside through the inner side of the protective side frame, the two protective side frames are symmetrically arranged, and the inner sides of the two protective side frames are filled with heat insulation layers.

[0013] Through the above scheme, through the action of setting the protective side frame, the protection of the air preheater main body can be improved, and the filling of the heat insulation layer further isolates the external temperature interference.

[0014] Further, the outer sides of the two protective side frames are fixedly connected with a plurality of circumferential arrays of first connecting plates, the outer side of the air preheater main body is fixedly connected with second connecting plates matched with the first connecting plates, and the first connecting plates and the second connecting plates are fixedly connected through bolts.

[0015] Through the above scheme, through the bolt connection design of the first connecting plate and the second connecting plate, the protective side frame and the air preheater main body can be quickly disassembled, the internal components can be easily maintained and replaced, and the stability and sealing performance of the connection structure are guaranteed.

[0016] Further, the air preheater body and the heat exchange inner frame are filled with thermal insulation rock wool.

[0017] Through the above scheme, by setting the air preheater body and the heat exchange inner frame filled with thermal insulation rock wool, the heat loss to the external environment is reduced, and the heat exchange of the heat exchange outer pipe is ensured to be stable, and the overall heat recovery efficiency is improved.

[0018] Further, the filter assembly comprises an assembly box fixedly connected to the outside of the air inlet pipe, and two groups of guide slots are formed in the inner side of the assembly box, and the inner sides of the two groups of guide slots are inserted with filter plates.

[0019] Through the above scheme, by setting the guide slot and the filter plate insertion structure, the modular filtering function of the filter assembly is realized, different specifications of filter plates can be replaced according to the cleanliness of flue gas, and the maintenance cost is reduced.

[0020] Further, the upper sides of the two filter plates are fixedly connected with top plates, and the bottom surfaces of the two top plates are fixedly connected with sealing pads.

[0021] Through the above scheme, by setting the top plate and the sealing pad, the sealing property between the filter plate and the assembly box is enhanced, and the heat loss caused by flue gas leakage is avoided.

[0022] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0023] The air preheater heat exchange recovery device, by setting the heat exchange inner frame, the flue gas can be preliminarily preheated after entering the heat exchange inner frame, at this time the heat exchange outer pipe and the heat pipe can preliminarily exchange heat, then the combination of the exhaust pipe and the heat pipe optimizes the exhaust path of the flue gas, avoids the loss of heat at the end, and prolongs the residence time of the flue gas in the air preheater body, reduces the waste of direct heat exhaust, then the flue gas can continuously heat the heat pipe and the heat exchange inner frame, the heat is transferred to the heat exchange medium in the heat exchange inner pipe through the pipe wall of the heat pipe, realizes the heat gradient transmission, forms a multi-layer heat exchange structure, and then the linkage design of the water outlet pipe, the temperature sensor and the electromagnetic valve realizes the dynamic recovery of waste heat by monitoring the water temperature in real time and adjusting the flow. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application;

[0025] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present application;

[0026] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the present application; Figure 2 It is an enlarged structure schematic diagram of A in the present application;

[0027] Figure 4It is a three-dimensional structure schematic diagram of the water outlet pipe of the application;

[0028] Figure 5 It is a schematic diagram of the internal structure of the filter assembly of the application.

[0029] In the figure:

[0030] 1, air preheater main body; 2, heat exchange inner frame; 3, air inlet pipe; 4, air outlet pipe; 5, filter assembly; 501, assembly box; 502, guide slot; 503, filter plate; 504, top plate; 505, sealing gasket; 6, heat exchange outer pipe; 7, heat conduction pipe; 8, heat exchange inner pipe; 9, smoke inlet; 10, smoke exhaust pipe; 11, fan; 12, fixed support; 13, booster pump; 14, protective side frame; 15, water outlet pipe; 16, temperature sensor; 17, electromagnetic valve; 18, first connecting plate; 19, second connecting plate; 20, heat insulation layer. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0032] Please refer to Figure 1 , Figure 2 and Figure 4 , the air preheater heat exchange recovery device in the embodiment comprises an air preheater main body 1, a heat exchange inner frame 2 is fixedly connected inside the air preheater main body 1, heat insulation rock wool is filled between the air preheater main body 1 and the heat exchange inner frame 2, by filling the heat insulation rock wool between the air preheater main body 1 and the heat exchange inner frame 2, the loss of heat to the external environment is reduced, the heat exchange of the heat exchange outer pipe 6 is ensured to be stable, and the overall heat recovery efficiency is improved, one side of the heat exchange inner frame 2 is fixedly connected with an air inlet pipe 3, the other side of the heat exchange inner frame 2 is fixedly connected with an air outlet pipe 4, a filter assembly 5 is arranged on the outer side of the air inlet pipe 3, a heat exchange outer pipe 6 is fixedly installed on the inner side of the air preheater main body 1, a heat conduction pipe 7 is fixedly connected to the inner side of the heat exchange inner frame 2, a heat exchange inner pipe 8 is fixedly connected to the outer side of the heat conduction pipe 7, the outer side of the heat exchange outer pipe 6 is fixedly connected with the heat exchange inner pipe 8 through the outer side of the heat exchange inner frame 2, a smoke exhaust pipe 10 is fixedly connected to the inner side of the heat conduction pipe 7, two symmetrical smoke inlets 9 are formed on the left outer side of the heat conduction pipe 7, a fan 11 is arranged in the inner side of the smoke exhaust pipe 10, and a water outlet pipe 15 is fixedly connected to the inner side of the heat exchange inner frame 2.

[0033] Please refer to Figure 1 and Figure 2, one end of the water outlet pipe 15 is fixedly connected to one end of the heat exchange inner tube 8, the outer side of the water outlet pipe 15 is fixedly installed with a temperature sensor 16, the outer side of the water outlet pipe 15 is fixedly installed with a solenoid valve 17, through the action of setting the heat exchange inner frame 2, the flue gas can be preliminarily preheated after entering the heat exchange inner frame 2, at this time the heat exchange outer tube 6 and the heat conducting pipe 7 can preliminarily exchange heat, then the combination of the smoke exhaust pipe 10 and the heat conducting pipe 7 optimizes the exhaust path of the flue gas, avoids the loss of heat at the end, and at the same time prolongs the residence time of the flue gas in the air preheater main body 1, reduces the waste of direct heat discharge, then the flue gas can continuously heat the heat conducting pipe 7 and the heat exchange inner frame 2, the heat is transferred to the heat exchange medium in the heat exchange inner tube 8 through the pipe wall of the heat conducting pipe 7, realizes the heat gradient transmission, forms a multi-layer heat exchange structure, then the linkage design of the water outlet pipe 15, the temperature sensor 16 and the solenoid valve 17 realizes the real-time monitoring of the water temperature and the adjustment of the flow, realizes the dynamic recovery of the waste heat, the inner side of the smoke exhaust pipe 10 is fixedly connected with a fixed support 12, the outer surface of the fan 11 is fixedly installed on the inner side of the fixed support 12, through the action of setting the fixed support 12, the stability of the operation of the smoke exhaust pipe 10 is improved, thereby enhancing the flow stability of the flue gas in the smoke exhaust pipe 10, avoiding the heat exchange efficiency reduction caused by turbulence.

[0034] Please refer to Figure 1 , Figure 2 and Figure 3 , the outer side of the heat exchange outer tube 6 is fixedly installed with a booster pump 13, the outer surface of the booster pump 13 is fixedly installed on the outer side of the air preheater main body 1, through the action of setting the booster pump 13, the flowability of the water flow between the heat exchange outer tube 6 and the heat exchange inner tube 8 is strengthened, ensuring that the water after heat exchange can be stably discharged, the air preheater main body 1 is provided with a protective side frame 14 on both sides, the outer side of the water outlet pipe 15 extends to the outside through the inner side of the protective side frame 14, the two protective side frames 14 are symmetrically arranged, the inner sides of the two protective side frames 14 are filled with a heat insulation layer 20, through the action of setting the protective side frame 14, the protectiveness of the air preheater main body 1 can be improved, and the filling of the heat insulation layer 20 further isolates the external temperature interference, the outer sides of the two protective side frames 14 are fixedly connected with a plurality of circumferential arrays of first connecting plates 18, the outer side of the air preheater main body 1 is fixedly connected with second connecting plates 19 matched with the first connecting plates 18, the first connecting plates 18 and the second connecting plates 19 are fixedly connected through bolts, through the bolt connection design of the first connecting plates 18 and the second connecting plates 19, the protective side frame 14 and the air preheater main body 1 can be quickly disassembled and assembled, which is convenient for the maintenance and replacement of the internal components, and ensures the stability and sealing performance of the connecting structure.

[0035] Please refer to Figure 1 , Figure 2 and Figure 5The filtering assembly 5 comprises an assembly box 501 fixedly connected to the outer side of the air inlet pipe 3, two groups of guide insertion grooves 502 are formed in the inner side of the assembly box 501, and the filtering plates 503 are inserted into the inner sides of the two groups of guide insertion grooves 502. The guide insertion groove 502 and the filtering plate 503 are inserted, so that the modular filtering function of the filtering assembly 5 is realized, different specifications of the filtering plates 503 can be replaced according to the flue gas cleanliness, the maintenance cost is reduced, the top plates 504 are fixedly connected to the upper sides of the two filtering plates 503, the sealing gaskets 505 are fixedly connected to the bottom surfaces of the two top plates 504, the top plate 504 and the sealing gasket 505 are arranged, the sealing property between the filtering plate 503 and the assembly box 501 is enhanced, and heat loss caused by flue gas leakage is avoided.

[0036] The air preheater heat recovery device in the embodiment can preliminarily preheat the heat exchange inner frame 2 after the flue gas enters, the heat exchange outer pipe 6 and the heat conduction pipe 7 can preliminarily exchange heat, the combination of the exhaust pipe 10 and the heat conduction pipe 7 optimizes the exhaust path of the flue gas, avoids heat loss at the end, prolongs the residence time of the flue gas in the air preheater main body 1, reduces the waste of direct heat exhaust, and then the flue gas can continuously heat the heat conduction pipe 7 and the heat exchange inner frame 2. The heat is transferred to the heat exchange medium in the heat exchange inner pipe 8 through the pipe wall of the heat conduction pipe 7, heat gradient transmission is realized, a multi-layer heat exchange structure is formed, the linkage design of the water outlet pipe 15, the temperature sensor 16 and the electromagnetic valve 17 realizes dynamic recovery of waste heat by monitoring the water temperature in real time and adjusting the flow.

[0037] The working principle of the above embodiment is as follows: the flue gas enters the air preheater main body 1 through the air inlet pipe 3, flows into the heat exchange area of the heat exchange inner frame 2 after being filtered by the two groups of filtering plates 503 in the filtering assembly 5, and then the flue gas can preliminarily preheat the heat exchange inner frame 2. The heat exchange outer pipe 6 outside the heat exchange inner frame 2 can preliminarily exchange heat, then the flue gas flows along the outer side of the heat conduction pipe 7, so that the heat exchange inner pipe 8 can be secondarily heat exchanged, then the fan 11 in the exhaust pipe 10 drives the flue gas to flow, so that the flue gas enters the inner side of the heat conduction pipe 7 from the end flue gas inlet 9 of the heat conduction pipe 7, and flows into the inner side of the exhaust pipe 10 from the front end of the exhaust pipe 10, thereby increasing the flue gas flow path and prolonging the heat exchange time. The flue gas can be secondarily preheated during the flue gas flow, the heat exchange inner pipe 8 further improves the heat recovery efficiency under the double heat exchange of the flue gas and the heat conduction pipe 7, and then the water outlet pipe 15 is connected with the heat exchange inner pipe 8 and the external waterway. At this time, the temperature sensor 16 monitors the temperature in real time, and the electromagnetic valve 17 adjusts the flow, so as to ensure that the waste heat of the water is introduced into the recovery system through the water outlet pipe 15.

[0038] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the enclosed claims. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the application can be varied in a multitude of ways. Such alterations, many of which will be apparent to those skilled in the art, can be based on current technology, and as such, this application should not be limited to the particular embodiments described herein, but should be understood to include all embodiments that are within the scope of the appended claims and their equivalents.

[0039] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air preheater heat recovery device comprising an air preheater main body (1), characterized by: The inside of the air preheater body (1) is fixedly connected with a heat exchange inner frame (2), one side of the heat exchange inner frame (2) is fixedly connected with an air inlet pipe (3), the other side of the heat exchange inner frame (2) is fixedly connected with an air outlet pipe (4), the outer side of the air inlet pipe (3) is provided with a filter assembly (5), the inner side of the air preheater body (1) is fixedly installed with a heat exchange outer pipe (6), the inner side of the heat exchange inner frame (2) is fixedly connected with a heat conduction pipe (7), the outer side of the heat conduction pipe (7) is fixedly connected with a heat exchange inner pipe (8), the outer side of the heat exchange outer pipe (6) is fixedly connected with the heat exchange inner pipe (8) through the outer side of the heat exchange inner frame (2), the inner side of the heat conduction pipe (7) is fixedly connected with a smoke exhaust pipe (10), the outer side of the left end of the heat conduction pipe (7) is provided with two symmetrical smoke inlets (9), the inner side of the smoke exhaust pipe (10) is provided with a fan (11), the inner side of the heat exchange inner frame (2) is fixedly connected with a water outlet pipe (15), one end of the water outlet pipe (15) is fixedly connected with one end of the heat exchange inner pipe (8), the outer side of the water outlet pipe (15) is fixedly installed with a temperature sensor (16), and the outer side of the water outlet pipe (15) is fixedly installed with a solenoid valve (17).

2. The heat recovery device of an air preheater according to claim 1, characterized in that: The inner side of the smoke exhaust pipe (10) is fixedly connected with a fixed support (12), and the outer surface of the fan (11) is fixedly installed on the inner side of the fixed support (12).

3. The heat recovery device of an air preheater according to claim 1, characterized in that: The outer side of the heat exchange outer pipe (6) is fixedly installed with a booster pump (13), and the outer surface of the booster pump (13) is fixedly installed on the outer side of the air preheater body (1).

4. The heat recovery device of an air preheater according to claim 1, characterized in that: Both sides of the air preheater body (1) are provided with protective side frames (14), the outer side of the water outlet pipe (15) extends to the outside through the inner side of the protective side frame (14), the two protective side frames (14) are symmetrically arranged, and the inner sides of the two protective side frames (14) are both filled with a heat insulation layer (20).

5. The heat recovery device of an air preheater according to claim 4, characterized in that: The outer sides of the two protective side frames (14) are fixedly connected with a plurality of circumferential arrays of first connecting plates (18), the outer side of the air preheater body (1) is fixedly connected with a second connecting plate (19) matched with the first connecting plate (18), and the first connecting plate (18) and the second connecting plate (19) are fixedly connected through bolts.

6. The heat recovery device of an air preheater according to claim 1, characterized in that: The air preheater body (1) and the heat exchange inner frame (2) are filled with heat insulation rock wool.

7. The heat recovery device of an air preheater according to claim 1, characterized in that: The filter assembly (5) comprises an assembly box (501) fixedly connected to the outer side of the air inlet pipe (3), two groups of guide insertion grooves (502) are formed in the inner side of the assembly box (501), and filter plates (503) are inserted into the inner sides of the two groups of guide insertion grooves (502).

8. The heat recovery device of an air preheater according to claim 7, characterized in that: The upper sides of the two filter plates (503) are fixedly connected with top plates (504), and the bottom surfaces of the two top plates (504) are fixedly connected with sealing gaskets (505).

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