High-efficiency heat energy recovery device for primary air of boiler

Abstract

The utility model relates to an efficient heat energy recovery device for primary air of a boiler, which belongs to the technical field of garbage incinerators and comprises a garbage incinerator, a primary air pre-heater is fixedly connected to the outer side of the garbage incinerator, a connecting pipe is fixedly connected to the top end of the primary air pre-heater, and a plurality of rows of concentric-square-shaped pipes are fixedly connected to the interior of the primary air pre-heater. And the outer side of the garbage incinerator is fixedly connected with an annular box. The primary air pre-heater has the advantages that external normal-temperature air can be sucked into the primary air pre-heater under the action of the air pump, heat exchange is carried out on high-temperature steam and the normal-temperature air in the primary air pre-heater, the temperature of the normal-temperature air is continuously increased, and finally, the normal-temperature air in the primary air pre-heater is heated. Air is fed into the hearth in the garbage incinerator through the air suction assembly by means of the air inlet pipe, then sufficient oxygen can be provided for garbage combustion, energy waste is remarkably reduced, and economical efficiency and environmental protection performance of household garbage incineration treatment are improved.

Description

Technical Field

[0001] This utility model relates to the field of waste incinerator technology, and in particular to a high-efficiency heat energy recovery device for primary air in boilers. Background Technology

[0002] Incinerators are a type of harmless treatment equipment commonly used for the treatment of medical and domestic waste, as well as animal waste. The principle is to use the combustion of fuels such as coal, oil, or gas to burn and carbonize the objects to be treated at high temperatures, thereby achieving the purpose of disinfection.

[0003] A search revealed a Chinese patent disclosure for a recyclable waste incineration grate device (authorization announcement number CN217082572U), comprising an incinerator and a hatch. The hatch is hinged to the side of the incinerator. Several equally spaced incineration racks are installed on both sides of the inner wall of the incinerator. A recycling trough is installed directly below the incineration racks. Rectangular grooves are recessed on both sides of the inner wall of the incinerator, and rollers are slidably connected within the rectangular grooves. The rollers are movably connected to the recycling trough. Drive mechanisms are installed on both sides of the incinerator and connected to the recycling trough. A second rotary motor is installed on the side of the incinerator, and the second rotary motor is driven by a first pulley. The first pulley is connected to a first conveying mechanism, which is located inside the incinerator. A second conveying mechanism is located directly below the first conveying mechanism. This patented technology solves the problem of incinerators being unable to incinerate different recyclable waste in separate zones by setting up multiple incineration racks and recycling troughs, reducing the time spent on incinerating different recyclable waste in stages, and further improving the waste incineration efficiency.

[0004] However, the above-mentioned devices still have some drawbacks in actual use. The most obvious one is that the waste incinerator produces a large amount of dust-laden gas when it is in operation. This gas is usually discharged through the exhaust pipe at the top. However, when the exhaust pipe is discharged directly, it will cause serious pollution because it carries a large amount of dust. At the same time, the large amount of heat generated during incineration cannot be well utilized, which will lead to a waste of resources. Utility Model Content

[0005] In view of the above-mentioned problems existing in the prior art, the main purpose of this utility model is to provide a high-efficiency heat energy recovery device for boiler primary air.

[0006] The technical solution of this utility model is as follows: a high-efficiency heat energy recovery device for primary air of a boiler, including a waste incinerator, a primary air preheater fixedly connected to the outside of the waste incinerator, a connecting pipe fixedly connected to the top of the primary air preheater, multiple rows of U-shaped pipes fixedly connected to the inside of the primary air preheater, an annular box fixedly connected to the outside of the waste incinerator, a fixed cylinder fixedly connected to the bottom of the primary air preheater, an air inlet pipe fixedly connected to the bottom of the fixed cylinder, the end of the air inlet pipe away from the fixed cylinder extending into the furnace of the waste incinerator, an air pump fixedly installed on the outside of the primary air preheater, and the output end of the air pump extending into the inside of the primary air preheater.

[0007] By adopting the above technical solution, the air pump can draw ambient air from outside into the primary air preheater, and the high-temperature steam and the ambient air in the primary air preheater can exchange heat, so that the temperature of the ambient air will continue to rise. Finally, the air is sent into the furnace of the waste incinerator through the air intake pipe by the suction assembly, thereby providing sufficient oxygen for waste combustion.

[0008] In a preferred embodiment, a filter assembly is provided at the top of the waste incinerator. The filter assembly includes a filter cylinder fixedly connected to the top of the waste incinerator. Multiple replacement plates are inserted into the inside of the filter cylinder, and filter screens are fixedly connected inside each replacement plate.

[0009] By adopting the above technical solution and using multiple filter screens, the rising high-temperature steam can be filtered, reducing the amount of impurities in the high-temperature steam adhering to the inner wall of the concave tube, thereby achieving efficient heat transfer.

[0010] In a preferred embodiment, the bottom end of the primary air preheater is provided with a suction assembly, which includes a fixed frame fixedly connected inside the fixed cylinder, and a suction fan is fixedly installed inside the fixed frame.

[0011] By adopting the above technical solution, the operation of the intake fan can increase the internal suction of the intake pipe and improve the air delivery speed, thereby improving the heat transfer efficiency.

[0012] In a preferred embodiment, the top end of the U-shaped tube extends to the outside of the primary air preheater and is fixedly connected to the connecting pipe. The end of the connecting pipe away from the primary air preheater extends into the interior of the filter cylinder. An exhaust pipe is fixedly connected to the bottom of the filter cylinder, and the end of the exhaust pipe away from the filter cylinder extends into the interior of the waste incinerator.

[0013] By adopting the above technical solution and the above structure, the normal delivery of air can be ensured.

[0014] In a preferred embodiment, a temperature sensor is fixedly installed inside the primary air preheater, a warning light is fixedly installed on the outside of the primary air preheater, and a controller is fixedly installed on the rear side of the primary air preheater.

[0015] By adopting the above technical solution and setting up temperature sensors, the air temperature inside the primary air preheater can be monitored.

[0016] In a preferred embodiment, the outer side of each replacement plate is fixedly connected with a sealing gasket, the top of the annular box is fixedly connected with an exhaust port, and the outer side of the primary air preheater is fixedly connected with an insulation layer.

[0017] By adopting the above technical solution and using a sealing gasket, the sealing performance between the replacement plate and the filter cartridge can be increased, reducing steam leakage.

[0018] In a preferred embodiment, a one-way valve b is fixedly installed inside the output end of the air pump, and a one-way valve a is fixedly installed at the end of the air inlet pipe near the waste incinerator.

[0019] By adopting the above technical solution, and through the combined use of one-way valve b and one-way valve a, the backflow of gas can be avoided.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0021] 1. In this utility model, when the waste incinerator is in operation, the high-temperature steam generated is transported to the primary air preheater through the connecting pipe, and then enters the multi-row spiral pipe. Through the action of the air pump, ambient air is drawn into the interior of the primary air preheater, and the high-temperature steam and the ambient air in the primary air preheater exchange heat, so that the temperature of the ambient air continuously increases. Finally, the air is sent into the furnace of the waste incinerator through the air intake pipe by the suction component, thereby providing sufficient oxygen for waste combustion, significantly reducing energy waste, and improving the economy and environmental protection of municipal solid waste incineration.

[0022] 2. In this utility model, by using multiple filter screens, the rising high-temperature steam can be filtered, which can reduce the impurities in the high-temperature steam from adhering to the inner wall of the U-shaped tube, thereby achieving efficient heat transfer. Attached Figure Description

[0023] Figure 1 This utility model provides an overall perspective view of the boiler primary air high-efficiency heat energy recovery device;

[0024] Figure 2 This utility model provides an internal schematic diagram of the primary air preheater of a high-efficiency heat recovery device for boiler primary air.

[0025] Figure 3 A schematic diagram of the suction assembly of the boiler primary air high-efficiency heat energy recovery device provided by this utility model;

[0026] Figure 4 A schematic diagram of the filter assembly for the boiler primary air high-efficiency heat energy recovery device provided by this utility model.

[0027] Legend: 1. Waste incinerator; 2. Circular box; 3. Primary air preheater; 4. Filter cartridge; 5. Connecting pipe; 6. Fixing cylinder; 7. U-shaped pipe; 8. Air pump; 9. Fixing frame; 10. Suction fan; 11. Replacement plate; 12. Filter screen; 13. Temperature sensor; 14. Warning light; 15. Insulation layer; 16. Air inlet pipe; 17. One-way valve a. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] Reference Figure 1-4The boiler primary air high-efficiency heat energy recovery device includes a waste incinerator 1. A primary air preheater 3 is fixedly connected to the outside of the waste incinerator 1. A connecting pipe 5 is fixedly connected to the top of the primary air preheater 3. Multiple rows of U-shaped pipes 7 are fixedly connected inside the primary air preheater 3. An annular box 2 is fixedly connected to the outside of the waste incinerator 1. A fixed cylinder 6 is fixedly connected to the bottom of the primary air preheater 3. An air inlet pipe 16 is fixedly connected to the bottom of the fixed cylinder 6. The end of the air inlet pipe 16 away from the fixed cylinder 6 extends into the furnace of the waste incinerator 1. An air pump 8 is fixedly installed on the outside of the primary air preheater 3. The output end of the air pump 8 extends into the interior of the primary air preheater 3. When the waste incinerator 1 is operating, the high-temperature steam generated is transported to the primary air preheater 3 through the connecting pipe 5. The steam then enters the multi-row spiral tube 7. The multi-row arrangement of the spiral tube 7 increases the residence time of the high-temperature steam in the primary air preheater 3, thereby achieving efficient heat transfer. The remaining heat in the high-temperature steam is then transferred to the annular box 2, further heating the waste incinerator 1. Through the action of the air pump 8, ambient air is drawn into the primary air preheater 3, allowing the high-temperature steam and the ambient air in the primary air preheater 3 to exchange heat, continuously increasing the temperature of the ambient air. Finally, the air is sent into the furnace of the waste incinerator 1 through the air intake pipe 16 via the suction assembly, thus providing sufficient oxygen for waste combustion, significantly reducing energy waste, and improving the economic and environmental benefits of municipal solid waste incineration.

[0030] Specifically, a filter assembly is installed at the top of the waste incinerator 1. The filter assembly includes a filter cylinder 4 fixedly connected to the top of the waste incinerator 1. Multiple replacement plates 11 are inserted inside the filter cylinder 4, and filter screens 12 are fixedly connected inside each replacement plate 11. Through the use of multiple filter screens 12, the rising high-temperature steam can be filtered, reducing the amount of impurities in the high-temperature steam adhering to the inner wall of the loop tube 7, thereby achieving efficient heat transfer. A suction assembly is installed at the bottom of the primary air preheater 3. The suction assembly includes a filter cylinder fixedly connected to the fixed cylinder. The internal mounting bracket 9 of the 6 is fixedly installed with an air intake fan 10. The operation of the air intake fan 10 can increase the internal suction of the air intake pipe 16 and improve the air delivery speed to improve the heat transfer efficiency. The top end of the U-shaped pipe 7 extends to the outside of the primary air preheater 3 and is fixedly connected to the connecting pipe 5. The end of the connecting pipe 5 away from the primary air preheater 3 extends into the interior of the filter cylinder 4. The bottom of the filter cylinder 4 is fixedly connected to an exhaust pipe. The end of the exhaust pipe away from the filter cylinder 4 extends into the interior of the waste incinerator 1 to ensure normal air delivery.

[0031] Specifically, a temperature sensor 13 is fixedly installed inside the primary air preheater 3, and a warning light 14 is fixedly installed on the outside of the primary air preheater 3. The temperature sensor 13 monitors the air temperature inside the primary air preheater 3. When the temperature reaches the preset value of the temperature sensor 13, it sends a message to the controller, which then activates the warning light 14. Simultaneously, the intake fan 10 is turned on, introducing the heat-exchanged air into the furnace chamber of the waste incinerator 1. A controller is fixedly installed on the rear side of the primary air preheater 3, and a replacement plate 1 is also installed. All outer sides of the replacement plate 11 are fixedly connected with sealing gaskets. The use of sealing gaskets can increase the sealing performance between the replacement plate 11 and the filter cartridge 4 and reduce steam leakage. All outer sides of the replacement plate 11 are fixedly connected with sealing gaskets. The top of the annular box 2 is fixedly connected with an exhaust port. The outer side of the primary air preheater 3 is fixedly connected with an insulation layer 15 to improve the insulation effect of the primary air preheater 3. A one-way valve b is fixedly installed inside the output end of the air pump 8. A one-way valve a17 is fixedly installed at the end of the air inlet pipe 16 near the waste incinerator 1 to prevent gas backflow.

[0032] Working principle: First, when the waste incinerator 1 is running, the high-temperature steam generated is transported to the primary air preheater 3 through the connecting pipe 5, and then enters the multi-row loop pipe 7. The multi-row arrangement of the loop pipe 7 increases the residence time of the high-temperature steam in the primary air preheater 3. The remaining heat in the high-temperature steam is transferred to the annular box 2, which further heats up the waste incinerator 1. Through the action of the air pump 8, ambient air is drawn into the primary air preheater 3, allowing the high-temperature steam and the ambient air in the primary air preheater 3 to exchange heat, thus continuously increasing the temperature of the ambient air. The temperature sensor 13 monitors the air temperature in the primary air preheater 3. When the temperature reaches the preset value of the temperature sensor 13, it sends a message to the controller, which then controls the warning light 14 to sound. At the same time, the suction fan 10 is turned on, and air is sent into the furnace of the waste incinerator 1 through the air intake pipe 16 via the suction assembly, thereby providing sufficient oxygen for waste combustion.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0034] The above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-efficiency heat recovery device for primary air of a boiler, including a waste incinerator (1), characterized in that: A primary air preheater (3) is fixedly connected to the outside of the waste incinerator (1). A connecting pipe (5) is fixedly connected to the top of the primary air preheater (3). A series of spiral pipes (7) are fixedly connected inside the primary air preheater (3). An annular box (2) is fixedly connected to the outside of the waste incinerator (1). A fixed cylinder (6) is fixedly connected to the bottom of the primary air preheater (3). An air inlet pipe (16) is fixedly connected to the bottom of the fixed cylinder (6). The end of the air inlet pipe (16) away from the fixed cylinder (6) extends into the furnace of the waste incinerator (1). An air pump (8) is fixedly installed on the outside of the primary air preheater (3). The output end of the air pump (8) extends into the interior of the primary air preheater (3).

2. The boiler primary air high-efficiency heat energy recovery device according to claim 1, characterized in that: The waste incinerator (1) is provided with a filter assembly at the top. The filter assembly includes a filter cylinder (4) fixedly connected to the top of the waste incinerator (1). Multiple replacement plates (11) are inserted inside the filter cylinder (4). Each replacement plate (11) is fixedly connected with a filter screen (12).

3. The boiler primary air high-efficiency heat energy recovery device according to claim 1, characterized in that: The bottom end of the primary air preheater (3) is provided with a suction assembly, which includes a fixed frame (9) fixedly connected inside the fixed cylinder (6), and a suction fan (10) is fixedly installed inside the fixed frame (9).

4. The boiler primary air high-efficiency heat energy recovery device according to claim 2, characterized in that: The top end of the loop tube (7) extends to the outside of the primary air preheater (3) and is fixedly connected to the connecting pipe (5). The end of the connecting pipe (5) away from the primary air preheater (3) extends into the interior of the filter cylinder (4). The bottom of the filter cylinder (4) is fixedly connected to an exhaust pipe. The end of the exhaust pipe away from the filter cylinder (4) extends into the interior of the waste incinerator (1).

5. The boiler primary air high-efficiency heat energy recovery device according to claim 1, characterized in that: A temperature sensor (13) is fixedly installed inside the primary air preheater (3), a warning light (14) is fixedly installed on the outside of the primary air preheater (3), and a controller is fixedly installed on the rear side of the primary air preheater (3).

6. The boiler primary air high-efficiency heat energy recovery device according to claim 2, characterized in that: The outer side of the replacement plate (11) is fixedly connected with a sealing gasket, the top of the annular box (2) is fixedly connected with an exhaust port, and the outer side of the primary air preheater (3) is fixedly connected with a heat insulation layer (15).

7. The boiler primary air high-efficiency heat energy recovery device according to claim 1, characterized in that: A one-way valve b is fixedly installed inside the output end of the air pump (8), and a one-way valve a (17) is fixedly installed at the end of the air inlet pipe (16) near the waste incinerator (1).

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