A boiler direct-current coil type flue gas condensing heat exchanger

Abstract

This utility model discloses a boiler direct-flow coil-type flue gas condensation heat exchange device, including a cylinder. A cover plate is welded to one end of the cylinder, and a second cover plate is welded to the other end. A heat exchange coil is installed inside the cylinder, and a sealing plate is fixed to the end of the heat exchange coil. A conical cover is welded to one outer wall of the second cover plate. An air outlet is opened at the center of the first cover plate. An insulation layer is fixed to the inner wall of the cylinder, and a refractory layer is fixed to the side of the insulation layer away from the cylinder. This utility model fixes the heat exchange coil inside the cylinder and seals the end of the heat exchange coil with the sealing plate, allowing the high-temperature flue gas to pass entirely through the gaps between the heat exchange fins. This enables the heat in the flue gas to be more effectively absorbed by the water, achieving a high heat recovery efficiency for the heat exchange device.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, specifically to a boiler direct-current coil flue gas condensation heat exchange device. Background Technology

[0002] A boiler is an energy conversion device. High-temperature flue gas is introduced into the boiler, and the boiler outputs steam or high-temperature water with a certain amount of thermal energy. It is an important component of a steam generator. The boiler's interior contains spiral heat exchange coils for condensing the flue gas. The outer wall of the heat exchange coils has several heat exchange fins. High-temperature flue gas enters through a circular channel inside the heat exchange coils, and the boiler shell has a flue gas outlet at one end. Currently, the circular flue gas channel inside the heat exchange coils is directly connected to the flue gas outlet at the end. During operation, the high-temperature flue gas cannot completely pass through the gaps between the fins on the outside of the heat exchange coils, resulting in low heat recovery efficiency. Therefore, there is an urgent need to design a boiler direct-flow coil-type flue gas condensation heat exchange device to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a boiler direct-flow coil flue gas condensation heat exchanger to address the aforementioned shortcomings in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A boiler direct-current coil type flue gas condensing heat exchange device includes a cylinder, one end of which is welded with a cover plate one, and the other end of which is welded with a cover plate two. A heat exchange coil is arranged inside the cylinder, and a sealing plate is fixed to the end of the heat exchange coil. A conical cover is welded to one outer wall of the cover plate two. An air outlet is opened at the center of the cover plate one. An insulation layer is fixed to the inner wall of the cylinder, and a refractory layer two is fixed to the side of the insulation layer away from the cylinder.

[0006] Furthermore, the inner wall of the conical cover is fixed with a fire-resistant layer, the end of the conical cover extends into the interior of the heat exchange coil, and the outer wall of the cylinder is provided with a rust-proof layer.

[0007] Furthermore, a water inlet pipe is fixed to one end of the heat exchange coil, and a water outlet pipe is fixed to the other end of the heat exchange coil. The ends of both the water inlet pipe and the water outlet pipe extend to the outside of the cylinder.

[0008] Furthermore, a support frame is fixed inside the heat exchange coil, one end of the support frame is fixed to the sealing plate, and the other end of the support frame is fixed to the conical cover.

[0009] Furthermore, the heat exchange coil includes a spiral tube, and the outer wall of the spiral tube is fixed with uniformly distributed heat exchange fins.

[0010] Furthermore, a positioning rod is fixed to one outer wall of the sealing plate, and a positioning cylinder is fixed to one outer wall of the cover plate, with the end of the positioning rod inserted into the inside of the positioning cylinder.

[0011] In the above technical solution, the boiler direct-flow coil flue gas condensation heat exchange device provided by this utility model has the following advantages: the heat exchange coil is fixed inside the cylinder, and the end of the heat exchange coil is sealed by a sealing plate, so that the high-temperature flue gas can pass through the gap between the heat exchange fins, thereby making the heat in the flue gas more effectively absorbed by the water, achieving a high heat recovery efficiency of the heat exchange device; the second refractory layer prevents the high-temperature flue gas from damaging the inner wall of the cylinder, extending the service life of the heat exchange device; the insulation layer makes it difficult for heat to dissipate through the outer wall of the cylinder, thus preventing excessive heat loss and further protecting the cylinder. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a boiler direct-current coil flue gas condensation heat exchanger according to the present invention.

[0014] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of a boiler direct-current coil flue gas condensation heat exchanger according to the present invention.

[0015] Figure 3 This is a schematic diagram of the heat exchange coil structure provided in an embodiment of a boiler direct-current coil type flue gas condensation heat exchange device of this utility model.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1. Cylindrical tube, 2. Heat exchange coil, 3. Sealing plate, 4. Cover plate I, 5. Vent hole, 6. Conical cover, 7. Refractory layer I, 8. Insulation layer, 9. Refractory layer II, 10. Water inlet pipe, 11. Water outlet pipe, 12. Spiral pipe, 13. Heat exchange fins, 14. Rust prevention layer, 15. Positioning cylinder, 16. Positioning rod, 17. Cover plate II, 18. Support frame. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1-3As shown in the figure, the present invention provides a boiler direct-current coil type flue gas condensing heat exchange device, including a cylinder 1, a cover plate 4 welded to one end of the cylinder 1, a cover plate 17 welded to the other end of the cylinder 1, a heat exchange coil 2 arranged inside the cylinder 1, a sealing plate 3 fixed to the end of the heat exchange coil 2, a conical cover 6 welded to one side of the outer wall of the cover plate 17, an air outlet 5 opened at the center of the cover plate 4, an insulation layer 8 fixed to the inner wall of the cylinder 1, and a refractory layer 9 fixed to the side of the insulation layer 8 away from the cylinder 1.

[0020] Specifically, in this embodiment, a cylinder 1 is included. A cover plate 4 is welded to one end of the cylinder 1, and a cover plate 17 is welded to the other end. Both cover plates 4 and 17 are circular. The cylinder 1, cover plate 4, and cover plate 17 form an outer shell. A heat exchange coil 2 is installed inside the cylinder 1, with a certain distance between them. The heat exchange coil 2 has a circular channel inside, allowing flue gas to enter and heat the water introduced into it. The heat exchange coil 2 includes a spiral tube 12, with uniformly distributed heat exchange fins 13 fixed to its outer wall. Gaps exist between the heat exchange fins 13. Both the heat exchange coil 2 and the heat exchange fins 13 are made of a metal material with good thermal conductivity and high temperature resistance. A sealing plate 3 is fixed to the end of the heat exchange coil 2. The sealing plate 3... The ends are sealed to allow high-temperature flue gas to pass completely through the gaps between the heat exchange fins 13. A conical hood 6 is welded to one side of the outer wall of the cover plate 17. The conical hood 6 enables the flue gas to be introduced into the heat exchange coil 2. An exhaust hole 5 is opened at the center of the cover plate 4. After the flue gas enters between the cylinder 1 and the heat exchange coil 2, it is discharged from the exhaust hole 5. An insulation layer 8 is fixed to the inner wall of the cylinder 1. The insulation layer 8 is made of rock wool. A refractory layer 9 is fixed to the side of the insulation layer 8 away from the cylinder 1. The refractory layer 9 is made of high-alumina bauxite clinker. The refractory layer 9 prevents the high-temperature flue gas from damaging the inner wall of the cylinder 1, thus extending the service life of the heat exchange device. The insulation layer 8 prevents heat from easily dissipating through the outer wall of the cylinder 1. On the one hand, it prevents excessive heat loss, and on the other hand, it further protects the cylinder 1.

[0021] This utility model provides a boiler direct-flow coil flue gas condensation heat exchange device, in which the heat exchange coil 2 is fixed inside the cylinder 1 and the end of the heat exchange coil 2 is sealed by the sealing plate 3, so that the high temperature flue gas can pass through the gap between the heat exchange fins 13, thereby enabling the heat in the flue gas to be absorbed by the water more effectively, and achieving the effect of high heat recovery efficiency of the heat exchange device.

[0022] In another embodiment of this utility model, a refractory layer 7 is fixed to the inner wall of the conical cover 6, and the end of the conical cover 6 extends into the interior of the heat exchange coil 2. The refractory layer 7 is also made of high-alumina bauxite clinker. The end of the conical cover 6 communicates with the opening of the cylinder 1. A rust-proof layer 14 is provided on the outer wall of the cylinder 1. The rust-proof layer 14 has a high-temperature resistance effect, which makes the outer wall of the cylinder 1 less prone to rusting. A water inlet pipe 10 is fixed to one end of the heat exchange coil 2, and a water outlet pipe 11 is fixed to the other end of the heat exchange coil 2. The ends of both the water inlet pipe 10 and the water outlet pipe 11 extend to the outside of the cylinder 1. The heated water enters the heat exchange coil 2 from the water inlet pipe 10, and the water vapor formed after heating... The heat exchange coil 2 is a double-layer structure, which further improves the heat recovery efficiency. A support frame 18 is fixed inside the heat exchange coil 2. One end of the support frame 18 is fixed to the sealing plate 3, and the other end of the support frame 18 is fixed to the conical cover 6. The support frame 18 provides a stable fixation for the heat exchange coil 2. A positioning rod 16 is fixed to one side of the outer wall of the sealing plate 3, and a positioning cylinder 15 is fixed to one side of the outer wall of the cover plate 4. The end of the positioning rod 16 is inserted into the inside of the positioning cylinder 15. The positioning rod 16 is inserted into the inside of the positioning cylinder 15, which makes it more convenient to position the end of the heat exchange coil 2 and the cover plate 4.

[0023] Working principle: During use, the water to be heated is introduced into the spiral tube 12 of the heat exchange coil 2 through the inlet pipe 10 and flows out through the outlet pipe 11. Meanwhile, high-temperature flue gas enters the interior of the heat exchange coil 2 through the conical shroud 6. The high-temperature flue gas enters the space between the cylinder 1 and the heat exchange coil 2 through the gap between the heat exchange fins 13 and then flows out through the outlet 5. The high-temperature flue gas heats the heat exchange fins 13 as it passes through them, so that the heat exchange fins 13 transfer heat to the interior of the spiral tube 12 to heat the water, thus achieving the effect of heat recovery.

[0024] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A boiler direct-flow coil type flue gas condensing heat exchanger, characterized in that, The cylinder (1) includes a cover plate (4) welded to one end of the cylinder (1) and a cover plate (17) welded to the other end of the cylinder (1). A heat exchange coil (2) is installed inside the cylinder (1). A sealing plate (3) is fixed to the end of the heat exchange coil (2). A conical cover (6) is welded to one side of the outer wall of the cover plate (17). An air vent (5) is opened at the center of the cover plate (4). An insulation layer (8) is fixed to the inner wall of the cylinder (1). A refractory layer (9) is fixed to the side of the insulation layer (8) away from the cylinder (1).

2. The boiler direct-flow coil flue gas condensing heat exchanger according to claim 1, characterized in that, The inner wall of the conical cover (6) is fixed with a fire-resistant layer (7), the end of the conical cover (6) extends into the interior of the heat exchange coil (2), and the outer wall of the cylinder (1) is provided with a rust-proof layer (14).

3. The boiler direct-flow coil flue gas condensing heat exchanger according to claim 1, characterized in that, One end of the heat exchange coil (2) is fixed with a water inlet pipe (10), and the other end of the heat exchange coil (2) is fixed with a water outlet pipe (11). The ends of the water inlet pipe (10) and the water outlet pipe (11) both extend to the outside of the cylinder (1).

4. The boiler direct-flow coil flue gas condensing heat exchanger according to claim 1, characterized in that, The heat exchange coil (2) is fixed with a support frame (18) inside. One end of the support frame (18) is fixed to the sealing plate (3), and the other end of the support frame (18) is fixed to the conical cover (6).

5. A boiler direct-flow coil type flue gas condensing heat exchanger according to claim 1, characterized in that, The heat exchange coil (2) includes a spiral tube (12), and the outer wall of the spiral tube (12) is fixed with uniformly distributed heat exchange fins (13).

6. A boiler direct-flow coil flue gas condensing heat exchanger according to claim 1, characterized in that, A positioning rod (16) is fixed to one side of the outer wall of the sealing plate (3), and a positioning cylinder (15) is fixed to one side of the outer wall of the cover plate (4). The end of the positioning rod (16) is inserted into the inside of the positioning cylinder (15).

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