Air preheater of boiler

Abstract

The utility model discloses a boiler air preheater, which belongs to the technical field of biomass boilers and comprises a preheating box body, a heat exchange mechanism is arranged inside the preheating box body, a conical air inlet cylinder is fixedly sleeved on the rear portion of the preheating box body, one end of the conical air inlet cylinder is fixedly connected with an air suction cylinder, and the other end of the conical air inlet cylinder is fixedly connected with an air outlet cylinder. The outer side of the air suction cylinder is sleeved with an ash collecting mechanism, and the end of an inner cavity of the air suction cylinder is fixedly sleeved with a filter screen. According to the preheating device, when air is guided into the preheating box body to be preheated, the fan blades are driven by the double-shaft motor to rotate, the air is blown into the inner cavity of the lower air inlet groove through the fan blades, meanwhile, the air is sucked into the air suction barrel from the outside through the end of the air suction barrel, and the air entering the air suction barrel is filtered through the filter screen; dust in the air is prevented from entering the lower air inlet groove, and meanwhile the dust is prevented from being attached to the inner wall of the spiral heat exchange copper pipe to affect the air preheating effect and efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of biomass boiler, more particularly to a boiler air preheater. BACKGROUND

[0002] The fuel of the biomass boiler is straw, branches and bark etc., and the flue gas discharged contains large particles of ash, in order to meet the emission requirements, the flue gas needs to be treated to treat the pollutants in the flue gas, to ensure that the emission standard is reached, in addition, the discharged flue gas has a certain temperature, and the air preheater can make the flue gas preheat the air entering the biomass boiler.

[0003] Through the search, the utility model patent with publication number CN219199249U discloses a kind of biomass boiler air preheater, including preheating box, the upper and lower sides of the preheating box are both communicated and fixed with flue gas box, one side of the flue gas box is fixed with air storage box, one side of the flue gas box is fixed with flue gas inlet pipe, one side of the flue gas box is fixed with flue gas inlet pipe;The patent exchanges the path of flue gas flow and the path of air flow in the traditional air preheater, air goes in pipe, flue gas goes outside pipe, so that dust in flue gas is attached to the surface of pipeline, avoids the phenomenon of blockage in pipeline, and simultaneously the utility model makes the flow velocity of air in pipeline can be reduced, so that air has more time to be heated, solves the problem that dust in smoke easily blocks pipeline when current air preheater is used, and air flow velocity is fast, and heating effect is poor.But the above patent still has the following deficiencies: air also carries certain dust, when air flows in ventilation pipe for a long time, dust will be attached to the inner wall of ventilation pipe, affect the efficiency and quality of hot gas in preheating box and air in ventilation pipe, for this reason, we propose a kind of boiler air preheater. UTILITY MODEL CONTENTS

[0004] In view of the problems in the prior art, the utility model aims to provide a boiler air preheater.

[0005] To solve the above problems, the utility model adopts the following technical scheme:

[0006] The utility model relates to a boiler air preheater, including the preheating box, the inside of preheating box is provided with heat transfer mechanism, the rear portion of preheating box is fixedly sleeved with the conical air inlet cylinder, one end of conical air inlet cylinder is fixedly connected with the air suction cylinder, the outside of air suction cylinder is sleeved with the dust collection mechanism, the end of air suction cylinder inner chamber is fixedly sleeved with the filter screen, the inner chamber of air suction cylinder is fixedly connected with the support frame, the middle part of support frame is fixedly installed with double shaft motor, one output shaft of double shaft motor is fixedly connected with the fan blade, the other output shaft of double shaft motor extends to the outside of air suction cylinder through filter screen and is fixedly connected with the scraper, and the inside of scraper and the outside of filter screen are in close contact.

[0007] As a preferred scheme of the utility model, the dust collection mechanism includes a dust collection box fixedly sleeved on the outside of the air suction cylinder, the side of the dust collection box is provided with an air suction hole, the bottom of the dust collection box is provided with a placing groove, the inner cavity of the placing groove is sleeved with a dust collection box, and the side of the dust collection box extends to the outside of the dust collection box and is fixedly connected with a taking block.

[0008] As a preferred scheme of the utility model, the heat transfer mechanism includes a lower air inlet groove, an upper air inlet groove, a preheating groove, a lower air outlet groove and an upper air outlet groove arranged in the inside of the preheating box, the inner cavity of the preheating groove is sleeved with a plurality of spiral heat exchange copper pipes, the bottom ends of the plurality of spiral heat exchange copper pipes extend to the inner cavities of the lower air inlet grooves through the upper air inlet grooves respectively, the top ends of the plurality of spiral heat exchange copper pipes extend to the inner cavities of the upper air outlet grooves through the lower air outlet grooves respectively, a plurality of lower air holes are formed in the bottom of the inner cavity of the preheating groove, and a plurality of upper air holes are formed in the top of the inner cavity of the preheating groove.

[0009] As a preferred scheme of the utility model, one side of the preheating box is fixedly sleeved with a flue gas inlet pipe, the end of the flue gas inlet pipe extends to the inner cavity of the upper air inlet groove, the other side of the preheating box is fixedly sleeved with a flue gas outlet pipe, the end of the flue gas outlet pipe extends to the inner cavity of the lower air outlet groove, the top of the preheating box is fixedly sleeved with an air outlet pipe, and the bottom end of the air outlet pipe extends to the inner cavity of the upper air outlet groove.

[0010] As a preferred scheme of the utility model, the other end of the conical air inlet cylinder is fixedly sleeved into the inner cavity of the lower air inlet groove.

[0011] As a preferred scheme of the utility model, the inner wall of the placing groove and the side of the dust collection box are in close contact.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] (1) The utility model discloses a preheating box body, when the air is introduced to the preheating box body and is preheated, the double-shaft motor drives the fan blade to rotate, the fan blade blows the air to the inner chamber of lower air inlet groove, and the end of the air suction cylinder is used to suck the air from the outside, and the filter screen is used to filter the air in the air suction cylinder, so that the dust in the air is prevented from entering the lower air inlet groove, and the dust is prevented from adhering to the inner wall of the spiral heat exchange copper pipe to affect the preheating effect and efficiency.

[0014] (2) The utility model discloses a preheating box body, when the air is introduced to the preheating box body and is preheated, the double-shaft motor drives the fan blade to rotate, the fan blade blows the air to the inner chamber of lower air inlet groove, and the end of the air suction cylinder is used to suck the air from the outside, and the filter screen is used to filter the air in the air suction cylinder, so that the dust in the air is prevented from entering the lower air inlet groove, and the dust is prevented from adhering to the inner wall of the spiral heat exchange copper pipe to affect the preheating effect and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole structure schematic diagram of the utility model;

[0016] Figure 2 It is the section view schematic diagram of the preheating box body of the utility model;

[0017] Figure 3 It is the split schematic diagram of the air suction cylinder, the dust collecting box and the dust collecting box of the utility model;

[0018] Figure 4 It is the section view schematic diagram of the air suction cylinder.

[0019] Mark explanation in drawing:

[0020] 1, preheating box body;2, heat exchange mechanism;3, conical air inlet cylinder;4, air suction cylinder;5, filter screen;6, dust collecting mechanism;7, support frame;8, double-shaft motor;9, fan blade;10, scraper;11, dust collecting box;12, air suction hole;13, placing groove;14, dust collecting box;15, take block;16, lower air inlet groove;17, upper air inlet groove;18, preheating groove;19, lower exhaust groove;20, upper exhaust groove;21, spiral heat exchange copper pipe;22, lower air hole;23, upper air hole;24, flue gas inlet pipe;25, flue gas outlet pipe;26, air outlet pipe. DETAILED DESCRIPTION

[0021] The technical schemes in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] In the description of the utility model, it needs to explain, the term "upper", "lower", "internal", "external", "top / bottom end" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element must have a particular orientation, construct and operate in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the term "first", "second" is only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the utility model, it needs to explain, unless otherwise specified and limited, the term "installation", "set", "sleeve / interfacing", "connection" and so on, should be understood broadly, for example, "connection", can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] Embodiment:

[0025] Please refer to Figures 1-4 A boiler air preheater, including preheating box 1, the inside of preheating box 1 is provided with heat exchange mechanism 2, the rear portion of preheating box 1 is fixedly sleeved with conical inlet cylinder 3, one end of conical inlet cylinder 3 is fixedly connected with suction cylinder 4, the outer side of suction cylinder 4 is sleeved with dust collecting mechanism 6, the end of the inner chamber of suction cylinder 4 is fixedly sleeved with filter screen 5, the inner chamber of suction cylinder 4 is fixedly connected with support frame 7, the middle part of support frame 7 is fixedly installed with double-shaft motor 8, one output shaft of double-shaft motor 8 is fixedly connected with fan blade 9, the other output shaft of double-shaft motor 8 extends to the outside of suction cylinder 4 through filter screen 5 and is fixedly connected with scraper 10, the inner side of scraper 10 and the outer side of filter screen 5 are in close contact.

[0026] In the embodiment, the double-shaft motor 8 is synchronously controlled by the controller on the biomass boiler, so that the inside of the biomass boiler can be supplied with air when the biomass boiler operates.

[0027] Specifically, please refer to Figure 1 And Figure 3 Dust collecting mechanism 6 includes dust collecting box 11 fixedly sleeved on the outer side of suction cylinder 4, suction hole 12 is formed in the side of dust collecting box 11, placing groove 13 is arranged on the bottom of dust collecting box 11, dust collecting box 14 is sleeved in the inner chamber of placing groove 13, taking block 15 is fixedly connected to the outside of dust collecting box 11 through the side of dust collecting box 14.

[0028] In this embodiment, the dust collecting box 14 is taken by the taking block 15, and the dust cleaned from the filter screen 5 is caught by the dust collecting box 14.

[0029] Specifically, please refer to Figure 2 The heat exchange mechanism 2 comprises a lower air inlet groove 16, an upper air inlet groove 17, a preheating groove 18, a lower air outlet groove 19 and an upper air outlet groove 20 arranged inside the preheating box 1, the inner cavity of the preheating groove 18 is sleeved with a plurality of spiral heat exchange copper pipes 21, the bottom ends of the plurality of spiral heat exchange copper pipes 21 respectively extend to the inner cavity of the lower air inlet groove 16 through the upper air inlet groove 17, the top ends of the plurality of spiral heat exchange copper pipes 21 respectively extend to the inner cavity of the upper air outlet groove 20 through the lower air outlet groove 19, a plurality of lower air holes 22 are arranged at the bottom of the inner cavity of the preheating groove 18, and a plurality of upper air holes 23 are arranged at the top of the inner cavity of the preheating groove 18.

[0030] Specifically, please refer to Figure 2 The preheating box 1 is fixedly sleeved with a flue gas inlet pipe 24 at one side, the end of the flue gas inlet pipe 24 extends to the inner cavity of the upper air inlet groove 17, the preheating box 1 is fixedly sleeved with a flue gas outlet pipe 25 at the other side, the end of the flue gas outlet pipe 25 extends to the inner cavity of the lower air outlet groove 19, and the preheating box 1 is fixedly sleeved with an air outlet pipe 26 at the top, and the bottom end of the air outlet pipe 26 extends to the inner cavity of the upper air outlet groove 20.

[0031] In this embodiment, the flue gas filtered and treated by the biomass boiler is introduced into the inner cavity of the upper air inlet groove 17 through the flue gas inlet pipe 24, and the flue gas is heat exchanged in the preheating groove 18, the flue gas is discharged through the flue gas outlet pipe 25, and the preheated air is introduced into the biomass boiler for use through the cooperation of the air outlet pipe 26 and the pipeline.

[0032] Specifically, please refer to Figure 1 , Figure 2 and Figure 4 The other end of the conical air inlet cylinder 3 is fixedly sleeved into the inner cavity of the lower air inlet groove 16.

[0033] In this embodiment, it is ensured that the air in the air suction cylinder 4 can enter the lower air inlet groove 16 from the conical air inlet cylinder 3.

[0034] Specifically, please refer to Figure 1 and Figure 3 The inner wall of the placing groove 13 and the side surface of the dust collecting box 14 are fitted.

[0035] In this embodiment, the stability of the dust collecting box 14 sleeved in the inner cavity of the placing groove 13 is ensured.

[0036] Working principle: in use, first, the flue gas generated during the operation of the biomass boiler is filtered and introduced into the inner cavity of the upper air inlet groove 17 from the flue gas inlet pipe 24, and the flue gas in the upper air inlet groove 17 enters the inner cavity of the preheating groove 18 from the lower air vent 22, the flue gas in the preheating groove 18 enters the lower air outlet groove 19 from the upper air vent 23, and the flue gas in the lower air outlet groove 19 is discharged from the flue gas outlet pipe 25, then the double-shaft motor 8 is started to drive the fan blade 9 and the scraper 10 to rotate, air is blown from the conical air inlet cylinder 3 to the inner cavity of the lower air inlet groove 16 by the rotation of the fan blade 9, and air is also sucked from the outside by the suction cylinder 4, and the air entering the suction cylinder 4 is filtered by the filter screen 5 to prevent dust in the air from entering the lower air inlet groove 16, and the dust filtered on the filter screen 5 is scraped by the rotation of the scraper 10 to clean the filter screen 5, the cleaned dust falls into the dust collecting box 14 for collection, and finally the air in the inner cavity of the lower air inlet groove 16 flows into the spiral heat exchange copper pipe 21 from the bottom end of the spiral heat exchange copper pipe 21, and the high-temperature flue gas in the inner cavity of the preheating groove 18 and the low-temperature air in the spiral heat exchange copper pipe 21 are heat exchanged to preheat the air in the spiral heat exchange copper pipe 21, and the preheated air enters the inner cavity of the upper air outlet groove 20 from the top end of the spiral heat exchange copper pipe 21, so that the preheated air is input into the biomass boiler from the air outlet pipe 26 and the pipeline for use.

[0037] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent replacement or change according to the technical scheme and improvement concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A boiler air preheater comprising a preheating box (1), characterized in that: The inside of the preheating box (1) is provided with a heat exchange mechanism (2), the rear of the preheating box (1) is fixedly sleeved with a conical air inlet cylinder (3), one end of the conical air inlet cylinder (3) is fixedly connected with an air suction cylinder (4), the outer side of the air suction cylinder (4) is sleeved with a dust collecting mechanism (6), the end of the inner cavity of the air suction cylinder (4) is fixedly sleeved with a filter screen (5), the inner cavity of the air suction cylinder (4) is fixedly connected with a support frame (7), the middle of the support frame (7) is fixedly installed with a double-shaft motor (8), one output shaft of the double-shaft motor (8) is fixedly connected with a fan blade (9), the other output shaft of the double-shaft motor (8) extends to the outside of the air suction cylinder (4) through the filter screen (5) and is fixedly connected with a scraper (10), and the inner side of the scraper (10) is attached to the outer side of the filter screen (5).

2. A boiler air preheater according to claim 1, characterised in that: The dust collecting mechanism (6) comprises a dust collecting box (11) fixedly sleeved on the outer side of the air suction cylinder (4), an air suction hole (12) is formed in the side of the dust collecting box (11), a placing groove (13) is arranged on the bottom of the dust collecting box (11), and the inner cavity of the placing groove (13) is sleeved with a dust collecting box (14), and the side of the dust collecting box (14) extends to the outside of the dust collecting box (11) and is fixedly connected with a taking block (15).

3. A boiler air preheater according to claim 1, characterized in that: The heat exchange mechanism (2) comprises a lower air inlet groove (16), an upper air inlet groove (17), a preheating groove (18), a lower air outlet groove (19) and an upper air outlet groove (20) arranged in the preheating box (1), the inner cavity of the preheating groove (18) is sleeved with a plurality of spiral heat exchange copper pipes (21), the bottom ends of the plurality of spiral heat exchange copper pipes (21) extend to the inner cavities of the lower air inlet groove (16) through the upper air inlet groove (17) respectively, the top ends of the plurality of spiral heat exchange copper pipes (21) extend to the inner cavities of the upper air outlet groove (20) through the lower air outlet groove (19) respectively, a plurality of lower air holes (22) are formed in the bottom of the inner cavity of the preheating groove (18), and a plurality of upper air holes (23) are formed in the top of the inner cavity of the preheating groove (18).

4. A boiler air preheater according to claim 3, characterised in that: One side of the preheating box (1) is fixedly sleeved with a flue gas inlet pipe (24), the end of the flue gas inlet pipe (24) extends to the inner cavity of the upper air inlet groove (17), the other side of the preheating box (1) is fixedly sleeved with a flue gas outlet pipe (25), the end of the flue gas outlet pipe (25) extends to the inner cavity of the lower air outlet groove (19), the top of the preheating box (1) is fixedly sleeved with an air outlet pipe (26), and the bottom end of the air outlet pipe (26) extends to the inner cavity of the upper air outlet groove (20).

5. A boiler air preheater according to claim 3, characterised in that: The other end of the conical air inlet cylinder (3) is fixedly sleeved into the inner cavity of the lower air inlet groove (16).

6. A boiler air preheater according to claim 2, characterized in that: The inner wall of the placing groove (13) is attached to the side of the dust collecting box (14).

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