Wear-resistant efficient evaporative cooling flue

Abstract

The utility model discloses a wear-resistant efficient evaporative cooling flue which comprises a support, an evaporative flue body with a flue gas inlet and a flue gas outlet is supported on the support, and the flue wall of the evaporative flue body is a membrane wall composed of heat exchange tubes and flat steel. One end of each heat exchange tube is simultaneously communicated with the water inlet header, the other end of each heat exchange tube is simultaneously communicated with the water outlet header, a plurality of heat exchange tube rows are arranged in the vaporization flue body, through-wall holes are formed in the flue wall of the vaporization flue body, and the two ends of each heat exchange tube row extend out of the vaporization flue body from the corresponding through-wall holes. A gap between the end of each heat exchange tube row and the corresponding through-wall hole is sealed through a sealing piece, and the two ends of each tube row heat exchange tube in each heat exchange tube row are communicated with a tube row water inlet collecting box and a tube row water outlet collecting box respectively. The utility model has the advantages of wear resistance and high efficiency.

Description

Technical Field

[0001] This utility model relates to the fields of energy conservation and environmental protection, and boiler design technology, specifically to a wear-resistant and efficient vaporization cooling flue for a natural circulation waste heat boiler in the smelting industry. Background Technology

[0002] In flue gas treatment, the first priority is to reduce the temperature of the flue gas and cool the dust in the high-temperature flue gas to a solid state, so as to create favorable conditions for subsequent processes.

[0003] Currently, the vaporization cooling flue used in smelting waste heat boilers has a limited heat exchange area due to structural limitations, which cannot achieve the purpose of cooling flue gas and dust. Increasing the length of the vaporization flue to increase the heat exchange area greatly increases construction costs with minimal benefits. The high dust content in the flue gas causes severe wear on the tube bundles when the flue gas flows laterally, making it impossible to adopt a boiler structure with convection tube bundles. Utility Model Content

[0004] The purpose of this invention is to provide a wear-resistant and efficient vaporization cooling flue with high efficiency in utilizing waste heat from flue gas.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a wear-resistant and high-efficiency vaporization cooling flue, characterized in that: it includes a support, on which a vaporization flue body with a flue gas inlet and a flue gas outlet is supported; the flue wall of the vaporization flue body is a membrane wall composed of heat exchange tubes and flat steel; one end of each heat exchange tube in the membrane wall is simultaneously connected to an inlet water header, and the other end of each heat exchange tube in the membrane wall is simultaneously connected to an outlet water header; within the vaporization flue body... The unit is equipped with several heat exchange tube banks composed of tube banks. The flue wall of the vaporization flue body is provided with through holes corresponding to the two ends of the heat exchange tube banks so that the two ends of the heat exchange tube banks can extend outward from the vaporization flue body. The two ends of each heat exchange tube bank extend outward from the corresponding through hole into the vaporization flue body. The gap between the end of each heat exchange tube bank and the corresponding through hole is sealed by a sealing element. The two ends of each heat exchange tube bank in each heat exchange tube bank are respectively connected to the tube bank inlet water header and the tube bank outlet water header.

[0006] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, each heat exchange tube is arranged circumferentially and evenly around the axis of the vaporization flue body inside the vaporization flue body. Each pair of adjacent heat exchange tubes forms a group, and adjacent groups do not contain the same heat exchange tube. The portions of the two heat exchange tubes in each group inside the vaporization flue body are fixedly connected together by a tube fixing device. The portions of each group of heat exchange tubes inside the vaporization flue body are not connected to the portions of other groups of heat exchange tubes inside the vaporization flue body.

[0007] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, the tube bank fixing device includes a fixing plate for connecting and fixing two heat exchange tube banks of each group together.

[0008] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, both the inlet and outlet water headers are annular headers surrounding the outside of the vaporization flue body; both the pipe-pile inlet and outlet water headers are straight headers.

[0009] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, the sealing structure includes: a pipe-pile through-wall sealing box, one side of which is open and the other side is closed. The through-wall sealing box covers the corresponding through-wall hole of the vaporization flue body through its open end. The open end of the through-wall sealing box is welded and sealed to the vaporization flue body. A through hole is provided on the wall of the pipe-pile through-wall sealing box facing the open end for the heat exchange pipes to pass through. The end of the heat exchange pipes extending from the corresponding through-wall hole of the vaporization flue body extends out of the pipe-pile through-wall sealing box through the through hole. The end of the heat exchange pipes is welded and sealed to the pipe-pile through-wall sealing box to seal the gap between the through hole of the pipe-pile through-wall sealing box and the heat exchange pipes.

[0010] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, several flue reinforcement rings are installed on the outer side of the vaporization flue body.

[0011] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, drain outlets are provided in the inlet manifold, outlet manifold, pipe-driven inlet manifold, and pipe-driven outlet manifold.

[0012] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, the heat exchange tube bank is composed of heat exchange tubes and flat steel tubes forming a membrane wall structure, and an anti-wear layer is provided in the part of the heat exchange tube bank that is subjected to transverse scouring by flue gas.

[0013] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, the cross-section of the vaporization flue body is circular.

[0014] Furthermore, in the aforementioned wear-resistant and high-efficiency vaporization cooling flue, after the flat steel at the wall penetration hole is cut, the heat exchange tubes at the wall penetration hole are divided into two groups, and the two groups of heat exchange tubes are bent and opened to both sides to form the wall penetration hole.

[0015] Through the implementation of the above technical solutions, the beneficial effects of this utility model are: (1) Several heat exchange tubes arranged in a circumferential direction are added inside the vaporization flue of the membrane wall structure, which increases the heat exchange area in the limited flue space, effectively cools the flue dust, improves the utilization efficiency of flue gas waste heat, and makes the temperature of the flue gas more uniform, providing a good operating environment for subsequent processes; and since the heat exchange area can be effectively increased without lengthening the vaporization flue, the production and use costs of enterprises are reduced; (2) Anti-wear layers are provided in the parts of the heat exchange tubes that are subjected to transverse scouring by flue gas, which effectively reduces the wear of the heat exchange tubes and can suppress the slag bridging of the heat exchange tubes, improves the wear resistance of the vaporization flue, extends the service life of the heat exchange tubes, and makes the boiler operation more stable and safer to use; (3) The flue is supported by the support as a whole, realizing the skid-mounted structure of the flue, which can be manufactured, transported and installed in a modular manner as a whole, making it more convenient to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a wear-resistant and high-efficiency vaporization cooling flue according to the present invention.

[0017] Figure 2 for Figure 1 AA section view in the image.

[0018] Figure 3 for Figure 1 A schematic diagram showing the positional relationship between the vaporization flue body and the support in the BB direction. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 , Figure 2 , Figure 3As shown, the wear-resistant and high-efficiency vaporization cooling flue includes a support 1, on which a vaporization flue body 4 with a flue gas inlet 2 and a flue gas outlet 3 is supported. The vaporization flue body 4 has a circular cross-section, which provides strong pressure resistance, safer use, and better suitability for applications with high flue gas pressure. The flue wall of the vaporization flue body 4 is a membrane wall composed of heat exchange tubes 41 and flat steel. One end of each heat exchange tube 41 in the membrane wall... Simultaneously connected to the inlet manifold 5 located outside the vaporization flue body, the other end of each heat exchange tube 41 in the membrane wall is also connected to the outlet manifold 6 located outside the vaporization flue body. Both the inlet manifold 5 and the outlet manifold 6 are annular manifolds surrounding the outside of the vaporization flue body 1. Inside the vaporization flue body 4, several heat exchange tube rows 7 composed of tube rows of heat exchange tubes 71 are arranged. In this embodiment, the heat exchange tube rows are composed of tube rows of heat exchange tubes 71 and tube rows of flat steel to form a membrane wall structure. The parts subjected to transverse scouring by flue gas are all provided with an anti-wear layer 14, which can be achieved by low-temperature micro-fusion welding, overlay welding, supersonic metal spraying, or other methods. The flue wall of the vaporization flue body 4 is provided with through-wall holes corresponding to the two ends of the heat exchange tube array 7, allowing the two ends of the heat exchange tube array 7 to extend outwards from the vaporization flue body 4. These through-wall holes do not cause leakage in the membrane wall. In this embodiment, after the flat steel at the through-wall hole is cut, the heat exchange tubes at the through-wall hole are divided into two groups, and these two groups of heat exchange tubes are bent to both sides. The tubes are opened to form through-wall holes; both ends of each heat exchange tube bank 7 extend outward from the corresponding through-wall holes into the vaporization flue body 4; the gap between the end of each heat exchange tube bank 7 and the corresponding through-wall hole is sealed by a sealing element; the two ends of each heat exchange tube 71 in each heat exchange tube bank 7 are respectively connected to the tube bank inlet water collector 8 and the tube bank outlet water collector 9; in this embodiment, each heat exchange tube bank 7 is equipped with a separate tube bank inlet water collector 8 and tube bank outlet water collector 9, and both the tube bank inlet water collector and the tube bank outlet water collector are straight collectors;

[0021] In this embodiment, each heat exchange tube row 7 is arranged circumferentially and evenly around the axis of the vaporization flue body inside the vaporization flue body. There are six heat exchange tube rows 7, with each pair of adjacent heat exchange tube rows 7 forming a group. Adjacent groups do not contain the same heat exchange tube row, meaning there are a total of three groups of heat exchange tube rows 7. The portions of the two heat exchange tube rows 7 within each group are fixedly connected together by a tube row fixing device. The portions of each group of heat exchange tube rows 7 within the vaporization flue body are not connected to the portions of the other groups of heat exchange tube rows 7 within the vaporization flue body. In this embodiment, the tube row fixing device includes a fixing plate 10 for connecting and fixing the two heat exchange tube rows 7 of each group together. The internal parts of the vaporization flue body 4 are welded together by the fixing plate 10, which increases the lateral rigidity of the heat exchange tubes 7. This effectively prevents the heat exchange tubes 7 from shaking, improving the operational stability and safety of the equipment. When the fixing plate 10 is heated and expands, the tubes will bend laterally under the expansion force, but will not be damaged. Moreover, since the part of each heat exchange tube 7 inside the vaporization flue body is not connected to the parts of other heat exchange tubes 7 inside the vaporization flue body, it avoids all the parts of the heat exchange tubes 7 inside the vaporization flue body from being connected into a whole. This effectively prevents the tubes from being damaged due to the difference between the expansion of the fixing plate and the expansion of the heat exchange tubes, further improving the operational stability and safety of the equipment.

[0022] In this embodiment, the structure of the sealing element includes: a pipe-bar through-wall sealing box 11, which is open on one side and closed on the other side. The through-wall sealing box 11 covers the corresponding through-wall hole of the vaporization flue body 4 through the open end. The open end of the through-wall sealing box 11 is welded and sealed to the vaporization flue body 4. A through hole is provided on the wall of the pipe-bar through-wall sealing box 11 facing the open end for the heat exchange pipe bar 7 to pass through. The end of the heat exchange pipe bar 7 extends out of the vaporization flue body 4 through the corresponding through-wall hole and then extends out of the pipe-bar through-wall sealing box 11 through the through hole. The end of the heat exchange pipe bar 7 is welded and sealed to the pipe-bar through-wall sealing box 11 to seal the gap between the through hole of the pipe-bar through-wall sealing box 11 and the heat exchange pipe bar 7. This not only effectively prevents the flue gas inside the vaporization flue from escaping, but also makes installation and maintenance convenient and the cost relatively low.

[0023] In this embodiment, several flue reinforcement rings 12 are installed on the outside of the vaporization flue body 4. Each flue reinforcement ring 12 can increase the overall rigidity of the vaporization flue, further improving the stability and safety of the equipment. In this embodiment, drain ports 13 are provided in the inlet water header 5, outlet water header 6, pipe-driven inlet water header 8, and pipe-driven outlet water header 9. The headers can be quickly cleaned through the drain ports, which is convenient for maintenance.

[0024] During operation, after the flue gas enters the vaporization flue body 1 through the flue gas inlet 2, the flue gas exchanges heat with the refrigerant in the heat exchange tube 41 and the refrigerant in each heat exchange tube bank 7, effectively cooling the flue dust, improving the waste heat utilization efficiency, and making the flue gas temperature more uniform, providing a good operating environment for subsequent processes. In addition, because the parts of the heat exchange tube bank that are subjected to transverse scouring by the flue gas are all equipped with anti-wear layers, the wear resistance of the vaporization flue is improved, the service life of the heat exchange tubes is extended, and the boiler operation is more stable and safer to use.

[0025] The advantages of this utility model are: (1) Several heat exchange tubes arranged in a circumferential direction are added inside the vaporization flue of the membrane wall structure, which increases the heat exchange area in the limited flue space, effectively cools the flue dust, improves the utilization efficiency of flue gas waste heat, and makes the temperature of the flue gas more uniform, providing a good operating environment for subsequent processes; and since the heat exchange area can be effectively increased without lengthening the vaporization flue, the production and use costs of enterprises are reduced; (2) Anti-wear layers are provided in the parts of the heat exchange tubes that are subjected to transverse scouring by flue gas, which effectively reduces the wear of the heat exchange tubes and can suppress the slag bridging of the heat exchange tubes, improves the wear resistance of the vaporization flue, extends the service life of the heat exchange tubes, and makes the boiler operation more stable and safer to use; (3) The flue is supported by the support as a whole, realizing the skid-mounted structure of the flue, which can be manufactured, transported and installed in a modular manner as a whole, making it more convenient to use.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any modifications or equivalent changes made based on the technical essence of the present utility model shall still fall within the scope of protection claimed by the present utility model.

Claims

1. A wear-resistant and high-efficiency vaporization cooling flue, characterized in that: The system includes a support, on which a vaporization flue body with a flue gas inlet and a flue gas outlet is supported. The flue wall of the vaporization flue body is a membrane wall composed of heat exchange tubes and flat steel. One end of each heat exchange tube in the membrane wall is connected to an inlet water header, and the other end of each heat exchange tube in the membrane wall is connected to an outlet water header. Several heat exchange tube rows composed of tube bundles are arranged inside the vaporization flue body. The flue wall of the vaporization flue body is provided with through holes corresponding to the two ends of the heat exchange tube rows so that the two ends of the heat exchange tube rows can extend outward from the vaporization flue body. The two ends of each heat exchange tube row extend outward from the corresponding through hole into the vaporization flue body. The gap between the end of each heat exchange tube row and the corresponding through hole is sealed by a sealing element. The two ends of each heat exchange tube in each heat exchange tube row are respectively connected to the tube row inlet water header and the tube row outlet water header.

2. The wear-resistant and high-efficiency vaporization cooling flue according to claim 1, characterized in that: Each heat exchange tube bank is arranged circumferentially and evenly around the axis of the vaporization flue body inside the vaporization flue body. Every two adjacent heat exchange tube banks form a group, and no two adjacent groups contain the same heat exchange tube bank. The portions of the two heat exchange tube banks in each group that are inside the vaporization flue body are fixedly connected together by a tube bank fixing device. The portions of each group of heat exchange tube banks inside the vaporization flue body are not connected to the portions of other groups of heat exchange tube banks inside the vaporization flue body.

3. The wear-resistant and high-efficiency vaporization cooling flue according to claim 2, characterized in that: The tube bank fixing device includes a fixing plate for connecting and fixing the two heat exchange tube banks of each group together.

4. The wear-resistant and high-efficiency vaporization cooling flue according to claim 1, characterized in that: Both the inlet and outlet water headers are annular headers surrounding the exterior of the vaporization flue; both the pipe-driven inlet and outlet water headers are straight headers.

5. The wear-resistant and high-efficiency vaporization cooling flue according to claim 1, characterized in that: The sealing structure includes: a pipe bank through-wall sealing box, one side of which is open and the other side is closed. The through-wall sealing box covers the corresponding through-wall hole of the vaporization flue body through the open end. The open end of the through-wall sealing box is welded and sealed to the vaporization flue body. A through hole is provided on the wall of the pipe bank through-wall sealing box facing the open end for the heat exchange pipe bank to pass through. The end of the heat exchange pipe bank extends out of the vaporization flue body from the corresponding through-wall hole and then extends out of the pipe bank through-wall sealing box through the through hole. The end of the heat exchange pipe bank is welded and sealed to the pipe bank through-wall sealing box to seal the gap between the through hole of the pipe bank through-wall sealing box and the heat exchange pipe bank.

6. The wear-resistant and high-efficiency vaporization cooling flue according to claim 1, characterized in that: Several flue reinforcement rings are installed on the outside of the vaporization flue body.

7. The wear-resistant and high-efficiency vaporization cooling flue according to claim 1, characterized in that: Drainage outlets are provided in the inlet manifold, outlet manifold, pipe-driven inlet manifold, and pipe-driven outlet manifold.

8. A wear-resistant and high-efficiency vaporization cooling flue according to any one of claims 1 to 7, characterized in that: The heat exchange tube bank is composed of heat exchange tubes and flat steel tubes forming a membrane wall structure. A wear-resistant layer is provided in the part of the heat exchange tube bank that is subjected to transverse scouring by flue gas.

9. The wear-resistant and high-efficiency vaporization cooling flue according to claim 8, characterized in that: The cross-section of the vaporization flue body is circular.

10. The wear-resistant and high-efficiency vaporization cooling flue according to claim 1, characterized in that: After the flat steel at the wall penetration hole is cut, the heat exchange tubes at the wall penetration hole are divided into two groups, and the two groups of heat exchange tubes are bent and opened to both sides to form the wall penetration hole.

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