Boiler heat energy recovery device

Abstract

The utility model discloses a boiler heat energy recovery device which relates to the technical field of waste heat recovery and comprises an air inlet, an air inlet bin, an air outlet and a water pipe, the air inlet is located at one end inside the air inlet bin and communicated with the inside of the air inlet bin, and supporting wheels are installed at the bottoms of the four ends of the air inlet bin. The top of one end of the air inlet bin is communicated with the interior of the connecting pipe, one end of the connecting top is communicated with the interior of the heat exchange bin, flue gas flows through the connecting pipe to enter the heat exchange bin, and in the process, heat of the flue gas is transferred to a water pipe in the heat exchange bin, so that water is preliminarily heated, and waste heat in the flue gas is absorbed; the flue gas subjected to heat exchange is exhausted through the exhaust port, in the exhaust process, the flue gas makes contact with the water pipe again, waste heat of the flue gas is secondarily utilized to preheat cold water in the water pipe, and the preheated water flows into the heat exchange pipe, is rapidly heated and is finally exhausted through the drainage port; by means of the design of the whole system, the waste heat recovery process is optimized, and energy conservation, emission reduction and efficient utilization of energy are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a boiler heat energy recovery device. Background Technology

[0002] Boilers emit high-temperature flue gas during operation. A heat recovery device can effectively recover and utilize the waste heat in the flue gas. A search revealed a Chinese patent with authorization number CN201507916U that discloses a boiler flue gas heat recovery device. Although it achieves energy recycling by connecting an inlet and outlet to a room-temperature water source and a boiler return water pipe or drain valve respectively, allowing the water in the tank to exchange heat with the heat exchange pipes before being connected to the boiler return water pipe or drain valve through the outlet, and continuously replenishing the tank with room-temperature water through the inlet, resulting in a high heat recovery rate and good performance, the flue gas emitted by this device still contains a small amount of waste heat. This small amount of waste heat cannot be further utilized, leading to waste heat. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a boiler heat recovery device that solves the problem mentioned in the background art that the flue gas discharged from existing devices still contains a small amount of residual heat, leading to waste of residual heat.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a boiler heat recovery device, comprising an air inlet, an air inlet chamber, an exhaust outlet, and a water pipe. The air inlet is located at one end inside the air inlet chamber and is connected to the interior of the air inlet chamber. Support wheels are installed at the bottom of the four ends of the air inlet chamber. The top of one end of the air inlet chamber is connected to the interior of a connecting pipe. The top end of the connecting pipe is connected to the interior of a heat exchange chamber. A heat exchange tube is installed inside the heat exchange chamber. Both ends of the heat exchange tube are connected to baffles. The outer edge of the baffles is welded to both ends of the heat exchange chamber. The top of the other end of the heat exchange chamber is connected to the exhaust outlet. A water pipe is inserted inside the exhaust outlet. One end of the water pipe is provided with a water inlet, and the other end of the water pipe is connected to the interior of a first water chamber. One end of the first water chamber is connected to the heat exchange chamber via a flange ring, and the other end of the heat exchange chamber is connected to a second water chamber via a flange ring. The bottom of one end of the second water chamber is connected to a drain outlet.

[0005] Preferably, a rectangular slot is provided on one side of the air intake chamber, and an inspection cover is provided on the outside of the rectangular slot. The top end of the inspection cover is hinged to the air intake chamber by a hinge, and the bottom end of the inspection cover is connected to the air intake chamber by a buckle. By unfastening the buckle, the inspection cover can be opened to facilitate the cleaning of the accumulated dust inside the air intake chamber and maintain the airflow inside the air intake chamber.

[0006] Preferably, the water pipe is arranged in a spiral shape inside the exhaust port, and the part of the water pipe inside the exhaust port is made of copper-aluminum composite material. The spiral shape of the water pipe helps to extend the travel of water inside the exhaust port, thereby allowing the cold water to be fully preheated.

[0007] Preferably, the exhaust port is provided with multiple fins, which are distributed in a regular annular pattern with equal spacing. The fins are fitted onto the outside of the water pipe. When the flue gas enters the exhaust port, it will come into contact with the multiple fins, thereby enabling the multiple fins to heat up quickly. The fins can transfer the temperature to the water pipe inserted inside, thereby improving the heat exchange efficiency between the water pipe and the flue gas inside the exhaust port.

[0008] Preferably, the heat exchange chamber is provided with multiple heat exchange tubes with gaps between them. The heat exchange tubes are welded to a semi-circular fixed plate, which is welded to the inner wall of the heat exchange chamber. Adjacent fixed plates are staggered vertically. Through the semi-circular fixed plate, the high-temperature flue gas will flow vertically and indirectly inside the heat exchange chamber, thereby extending the travel distance of the high-temperature flue gas inside the heat exchange chamber and fully exchanging heat with the heat exchange tubes.

[0009] Preferably, the surface of the baffle is provided with holes and grooves, and each hole and groove corresponds to a heat exchange tube. The heat exchange tubes are welded to the holes and grooves, so that the cold water entering from the inlet can enter the first water tank through the water pipe, and then be evenly distributed to the inside of each heat exchange tube by the baffle.

[0010] This utility model provides a boiler heat energy recovery device. It has the following beneficial effects:

[0011] (1) This boiler heat recovery device connects the boiler exhaust port to the device's air inlet, allowing high-temperature flue gas to flow into the air inlet chamber. Subsequently, the flue gas flows through the connecting pipe into the heat exchange chamber. During this process, the heat of the flue gas is transferred to the water pipes in the heat exchange chamber, achieving preliminary heating of the water and absorbing the waste heat in the flue gas. The heat-exchanged flue gas is discharged through the exhaust port. During the discharge process, the flue gas comes into contact with the water pipes again, and the waste heat of the flue gas is used again to preheat the cold water in the water pipes, enhancing the heat exchange efficiency. The preheated water flows into the heat exchange tubes, rapidly heats up, and enters the second water chamber through the heat exchange tubes, and is finally discharged through the drain port. The design of the entire system optimizes the waste heat recovery process, improves the utilization rate of boiler flue gas waste heat, and contributes to energy conservation, emission reduction, and efficient energy utilization.

[0012] (2) In this boiler heat recovery device, when the flue gas enters the exhaust port, it will come into contact with multiple fins, thereby enabling the multiple fins to heat up quickly. The fins can transfer the temperature to the water pipes inserted inside, thereby improving the heat exchange efficiency between the water pipes and the flue gas inside the exhaust port. In addition, the spiral water pipes help to extend the travel of the water inside the exhaust port, so that the cold water can be fully preheated. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a side view of the structure of this utility model;

[0015] Figure 3 This is a top view of the structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the internal structure of this utility model;

[0017] Figure 5 This is a schematic diagram of the water pipe structure of this utility model.

[0018] In the diagram, 1 is the air inlet; 2 is the air intake chamber; 3 is the support wheel; 4 is the connecting pipe; 5 is the heat exchange chamber; 6 is the exhaust port; 7 is the water inlet; 8 is the first water chamber; 9 is the heat exchange tube; 10 is the baffle; 11 is the second water chamber; 12 is the drain port; 13 is the inspection cover; 14 is the water pipe; 15 is the fin; and 16 is the fixing plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1:

[0021] Please see Figure 1-5This utility model provides a technical solution: a boiler heat energy recovery device, including an air inlet 1, an air inlet chamber 2, an exhaust port 6, and a water pipe 14. The air inlet 1 is located inside one end of the air inlet chamber 2 and is connected to the interior of the air inlet chamber 2. Support wheels 3 are installed at the bottom of the four ends of the air inlet chamber 2. The top of one end of the air inlet chamber 2 is connected to the interior of a connecting pipe 4, and the top end of the connecting pipe is connected to the interior of a heat exchange chamber 5. A heat exchange tube 9 is installed inside the heat exchange chamber 5. Both ends of the heat exchange tube 9 are connected to baffles 10, and the outer edge of the baffles 10 is connected to... The heat exchange chamber 5 is welded at both ends, and the top of the other end of the heat exchange chamber 5 is connected to the exhaust port 6. A water pipe 14 is inserted inside the exhaust port 6. One end of the water pipe 14 is provided with a water inlet 7, and the other end of the water pipe 14 is connected to the inside of the first water chamber 8. One end of the first water chamber 8 is connected to the heat exchange chamber 5 through a flange ring, and the other end of the heat exchange chamber 5 is connected to the second water chamber 11 through a flange ring. The bottom of one end of the second water chamber 11 is connected to the drain port 12. A rectangular slot is opened on one side of the air inlet chamber 2, and an inspection cover 13 is provided on the outside of the rectangular slot for maintenance. One end of the cover 13 is hinged to the air inlet chamber 2, and the bottom end of the inspection cover 13 is connected to the air inlet chamber 2 via a snap fastener. In use, the device connects to the boiler exhaust port 6 via the air inlet 1, allowing the high-temperature flue gas discharged from the boiler to enter the air inlet chamber 2. The high-temperature flue gas then enters the heat exchange chamber 5 via the connecting pipe 4, heating the water pipe 14 inside the heat exchange chamber 5. This allows the water inside the water pipe 14 to absorb the residual heat from the flue gas, thus heating the water for daily use. The flue gas after heat exchange is then discharged through the exhaust. The flue gas is discharged through outlet 6. When the flue gas passes through outlet 6, it will come into contact with water pipe 14. The waste heat of the flue gas inside outlet 6 will further exchange heat with water pipe 14, thereby preheating the cold water inside water pipe 14. The preheated water inside water pipe 14 enters the heat exchange tube 9 and can be heated up quickly, thereby improving the heating effect of the water. The heated water enters the second water tank 11 through heat exchange tube 9 and is then discharged through outlet 12, so that the waste heat in the boiler flue gas can be reused, thereby improving the utilization rate of waste heat.

[0022] Example 2:

[0023] This utility model embodiment provides a technical solution: a boiler heat energy recovery device, in which a water pipe 14 is spirally arranged inside the exhaust port 6, and the portion of the water pipe 14 inside the exhaust port 6 is made of copper-aluminum composite material. Multiple fins 15 are arranged inside the exhaust port 6, with the fins 15 distributed in a ring-shaped, equally spaced pattern, and are fitted onto the outside of the water pipe 14. Multiple heat exchange tubes 9 are arranged inside the heat exchange chamber 5, with gaps between them, and are welded to a semi-circular fixing plate 16. The fixing plate 16 is welded to the inner wall of the heat exchange chamber 5, and adjacent fixing plates 16 are staggered vertically. A baffle 10 has slots on its surface, with each slot corresponding to a heat exchange tube 9, and the heat exchange tube 9 is welded to the slot. The cold water entering through inlet 7 can enter the first water chamber 8 through water pipe 14, and then be evenly distributed to each heat exchange tube 9 through baffle 10. The semi-circular fixing plate 16 causes the high-temperature flue gas to circulate up and down in the heat exchange chamber 5, thereby extending the travel distance of the high-temperature flue gas in the heat exchange chamber 5 and fully exchanging heat with the heat exchange tube 9. When the flue gas enters the exhaust port 6, it will come into contact with multiple fins 15, thereby enabling the multiple fins 15 to heat up quickly. The fins 15 can transfer the temperature to the water pipe 14 inserted inside, thereby improving the heat exchange efficiency between the water pipe 14 and the flue gas inside the exhaust port 6. In addition, the spiral water pipe 14 helps to extend the travel distance of the water in the exhaust port 6, so that the cold water can be fully preheated.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A boiler heat recovery device, characterized in that: Includes an air inlet (1), an air intake chamber (2), an exhaust port (6), and a water pipe (14). The air inlet (1) is located at one end inside the air intake chamber (2) and is connected to the interior of the air intake chamber (2). Support wheels (3) are installed at the bottom of the four ends of the air intake chamber (2). The top of one end of the air intake chamber (2) is connected to the interior of a connecting pipe (4). The top end of the connecting pipe is connected to the interior of a heat exchange chamber (5). A heat exchange tube (9) is installed inside the heat exchange chamber (5). Both ends of the heat exchange tube (9) are connected to baffles (10). 10) The outer edge is welded to both ends of the heat exchange chamber (5), and the top of the other end of the heat exchange chamber (5) is connected to the exhaust port (6). A water pipe (14) is inserted inside the exhaust port (6). One end of the water pipe (14) is provided with a water inlet (7), and the other end of the water pipe (14) is connected to the inside of the first water chamber (8). One end of the first water chamber (8) is connected to the heat exchange chamber (5) through a flange ring, and the other end of the heat exchange chamber (5) is connected to the second water chamber (11) through a flange ring. The bottom of one end of the second water chamber (11) is connected to the drain port (12).

2. The boiler heat recovery device according to claim 1, characterized in that: The air intake chamber (2) has a rectangular slot on one side, and an inspection cover (13) is provided on the outside of the rectangular slot. The top end of the inspection cover (13) is hinged to the air intake chamber (2) by a hinge, and the bottom end of the inspection cover (13) is connected to the air intake chamber (2) by a buckle.

3. The boiler heat recovery device according to claim 1, characterized in that: The water pipe (14) is spirally arranged inside the exhaust port (6), and the water pipe (14) inside the exhaust port (6) is made of copper-aluminum composite material.

4. The boiler heat recovery device according to claim 1, characterized in that: The exhaust port (6) is provided with multiple fins (15) inside. The fins (15) are distributed in a regular annular pattern with equal spacing between them, and the fins (15) are fitted onto the outside of the water pipe (14).

5. The boiler heat recovery device according to claim 1, characterized in that: The heat exchange chamber (5) is provided with multiple heat exchange tubes (9), and there are gaps between the heat exchange tubes (9). The heat exchange tubes (9) are welded to a semi-circular fixing plate (16), and the fixing plate (16) is welded to the inner wall of the heat exchange chamber (5). The adjacent fixing plates (16) are distributed in an up-down staggered manner.

6. The boiler heat recovery device according to claim 1, characterized in that: The surface of the baffle (10) is provided with holes and grooves, and each hole and groove corresponds to a heat exchange tube (9), and the heat exchange tube (9) is welded to the hole and groove.

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