Residual heat boiler

Abstract

The application provides a waste heat boiler, which comprises a boiler tube box, a water inlet header, a water inlet distribution pipeline, a water outlet header, and a heat exchange tube group; the boiler tube box is in a cylindrical structure and has a circular inner cavity cross section; the water inlet header is arranged on the lower outer side of the boiler tube box; the water inlet distribution pipeline is arranged in the boiler tube box and one end of the water inlet distribution pipeline is connected with the water inlet header; the water outlet header is arranged on the upper outer side of the boiler tube box; the water outlet distribution pipeline is arranged in the boiler tube box and one end of the water outlet distribution pipeline is connected with the water outlet header; and the heat exchange tube group is arranged in the inner cavity along the axial direction of the boiler tube box, the lower end of the heat exchange tube group is communicated with the water inlet distribution pipeline, and the upper end of the heat exchange tube group is communicated with the water outlet distribution pipeline. The application has the beneficial effect that the inner cavity cross section of the boiler tube box is circular, the local stress concentration of the boiler tube box can be eliminated, the airflow distribution uniformity of flue gas can be improved, local deposition of smoke dust can be avoided, and the heat exchange efficiency of the overall device can be improved.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery from flue gas, and more specifically to a waste heat boiler. Background Technology

[0002] Low- and medium-temperature flue gas waste heat recovery mainly relies on convection heat transfer. Convection heat transfer tube bundles are usually arranged inside the waste heat boiler tube box. Flue gas washes over the convection heat transfer tube bundles, transferring heat to the fluid inside the tubes. The fluid absorbs the heat and turns into steam or hot water. However, the flow cross section of the convection heat transfer tube bundles in existing waste heat boilers is usually square or rectangular. Flue gas flows through the tube box and washes over the horizontally arranged heat transfer tubes laterally.

[0003] Disadvantages of existing technology: Existing square tube boxes are prone to right-angle stress concentration at the four corners, resulting in uneven structural stress in different areas, which is detrimental to the safety of the boiler tube box. Square tube boxes also have "dead corners," where the flue gas velocity is lower, causing uneven heat exchange and making it easy for ash to accumulate at the four corners of the tube box. Summary of the Invention

[0004] This invention provides a waste heat boiler to improve heat exchange efficiency.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: a waste heat boiler, comprising: a boiler tube box, which is a cylindrical structure and the inner cavity of the boiler tube box has a circular cross-section; an inlet water header, which is disposed on the lower outer side of the boiler tube box; an inlet water distribution pipe, which passes through the boiler tube box and one end of the inlet water distribution pipe is connected to the inlet water header; an outlet water header, which is disposed on the upper outer side of the boiler tube box; an outlet water distribution pipe, which passes through the boiler tube box and one end of the outlet water distribution pipe is connected to the outlet water header; and a heat exchange tube assembly, which is disposed in the inner cavity along the axial direction of the boiler tube box, with the lower end of the heat exchange tube assembly connected to the inlet water distribution pipe and the upper end of the heat exchange tube assembly connected to the outlet water distribution pipe.

[0006] Furthermore, there are two inlet headers, symmetrically arranged on the lower outer side of the boiler tube box. The inlet water distribution pipeline passes through the boiler tube box and the two ends of the inlet water distribution pipeline are respectively connected to the two inlet headers.

[0007] Furthermore, there are two outlet headers, symmetrically arranged on the upper outer side of the boiler tube box. The outlet water distribution pipeline passes through the boiler tube box and the two ends of the outlet water distribution pipeline are respectively connected to the two outlet headers.

[0008] Furthermore, there are multiple inlet water distribution pipes, which are evenly distributed in parallel along the cross-sectional direction of the lower end of the boiler tube box; there are multiple outlet water distribution pipes, which are evenly distributed in parallel along the cross-sectional direction of the upper end of the boiler tube box, and the multiple outlet water distribution pipes correspond one-to-one with the multiple inlet water distribution pipes in the vertical direction; a heat exchange tube group is installed between each corresponding inlet water distribution pipe and outlet water distribution pipe.

[0009] Furthermore, the inlet water distribution pipeline includes a first water distribution pipeline and a second water distribution pipeline arranged in parallel and spaced apart. The first water distribution pipeline is located below the second water distribution pipeline, and the first water distribution pipeline and the second water distribution pipeline are staggered. The outlet water distribution pipeline includes a third water distribution pipeline and a fourth water distribution pipeline arranged in parallel and spaced apart. The third water distribution pipeline is located above the fourth water distribution pipeline, and the third water distribution pipeline and the fourth water distribution pipeline are staggered. The first water distribution pipeline and the third water distribution pipeline are vertically aligned, and the second water distribution pipeline and the fourth water distribution pipeline are vertically aligned. A heat exchange tube assembly is connected between the first water distribution pipeline and the third water distribution pipeline, and a heat exchange tube assembly is connected between the second water distribution pipeline and the fourth water distribution pipeline.

[0010] Furthermore, there are multiple first, second, third, and fourth water distribution pipelines, and these multiple first, second, third, and fourth water distribution pipelines are arranged in parallel and spaced apart from each other.

[0011] Furthermore, the heat exchange tube assembly includes at least one heat exchange tube, which is arranged vertically, and its two ends are respectively connected to the corresponding inlet water distribution pipe and outlet water distribution pipe.

[0012] Furthermore, heat exchange tubes are also provided with heat dissipation fins, the length direction of which is parallel to the axial direction of the heat exchange tubes.

[0013] Furthermore, sealing components are installed at the perforations between the inlet water distribution pipe and the boiler tube box; sealing components are also installed at the perforations between the outlet water distribution pipe and the boiler tube box.

[0014] Furthermore, a wear-resistant steel plate is installed on the side of the water outlet distribution pipe facing the top of the boiler tube box.

[0015] The beneficial effects of the present invention are that, in the embodiments of the present invention, the inner cavity cross-section of the boiler tube box is set to be circular, which can eliminate local stress concentration in the boiler tube box, improve the uniformity of airflow distribution of flue gas in the waste heat boiler, avoid local deposition of soot, and the heat exchange tube group set along the axial direction of the boiler tube box can increase the heat exchange efficiency of the overall device. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the water inlet manifold and water inlet distribution pipeline according to an embodiment of the present invention;

[0018] Figure 2This is a schematic diagram of the water outlet manifold and water outlet distribution pipeline according to an embodiment of the present invention;

[0019] Figure 3 This is a longitudinal sectional view of an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the heat exchange tubes and heat sink fins.

[0021] Figure 5 This is a schematic diagram of the assembly structure of the water distribution pipeline and the wear-resistant steel plate;

[0022] Figure 6 for Figure 5 Sectional view along the CC direction.

[0023] The attached diagram is labeled as follows: 10, boiler tube box; 20, inlet water header; 30, inlet water distribution pipeline; 31, first water distribution pipeline; 32, second water distribution pipeline; 40, outlet water header; 50, outlet water distribution pipeline; 51, third water distribution pipeline; 52, fourth water distribution pipeline; 61, heat exchange tube; 62, heat dissipation fins; 70, wear-resistant steel plate. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 6 As shown, this embodiment of the invention provides a waste heat boiler, including a boiler tube box 10, an inlet water header 20, an inlet water distribution pipeline 30, an outlet water header 40, an outlet water distribution pipeline 50, and a heat exchange tube assembly. The boiler tube box 10 has a cylindrical structure and the cross-section of its inner cavity is circular. The inlet water header 20 is located on the lower outer side of the boiler tube box 10; the inlet water distribution pipeline 30 passes through the boiler tube box 10 and one end of the inlet water distribution pipeline 30 is connected to the inlet water header 20; the outlet water header 40 is located on the upper outer side of the boiler tube box 10; the outlet water distribution pipeline 50 passes through the boiler tube box 10 and one end of the outlet water distribution pipeline 50 is connected to the outlet water header 40; the heat exchange tube assembly is arranged in the inner cavity along the axial direction of the boiler tube box 10, the lower end of the heat exchange tube assembly is connected to the inlet water distribution pipeline 30, and the upper end of the heat exchange tube assembly is connected to the outlet water distribution pipeline 50.

[0026] In this embodiment of the invention, the inner cross-section of the boiler tube box 10 is set to be circular, which can eliminate local stress concentration in the boiler tube box 10, improve the uniformity of airflow distribution of flue gas in the waste heat boiler, avoid local dust deposition, and the heat exchange tube group set along the axial direction of the boiler tube box 10 can increase the heat exchange efficiency of the overall device.

[0027] like Figure 1As shown, there are two inlet manifolds 20, symmetrically arranged on the lower outer side of the boiler tube box 10. The inlet water distribution pipe 30 passes through the boiler tube box 10, and both ends of the inlet water distribution pipe 30 are connected to the two inlet manifolds 20 respectively. Correspondingly, there are two outlet manifolds 40, symmetrically arranged on the upper outer side of the boiler tube box 10. The outlet water distribution pipe 50 passes through the boiler tube box 10, and both ends of the outlet water distribution pipe 50 are connected to the two outlet manifolds 40 respectively.

[0028] Symmetrically arranging two inlet headers 20 and two outlet headers 40 can improve the uniformity of inlet and outlet water, resulting in higher heat exchange efficiency.

[0029] In this embodiment, the inlet header 20 and the outlet header 40 have the same cross-sectional shape and are both fan-shaped structures. The purpose is to adapt to the arc-shaped outer wall of the boiler tube box 10 so that the shapes of the inlet header 20 and the outlet header 40 can be adapted to the shape of the boiler tube box 10, thereby saving external space.

[0030] like Figure 1 and Figure 2 As shown, there are multiple inlet water distribution pipes 30, which are evenly distributed parallel to each other along the cross-sectional direction of the lower end of the boiler tube box 10; there are multiple outlet water distribution pipes 50, which are evenly distributed parallel to each other along the cross-sectional direction of the upper end of the boiler tube box 10, and the multiple outlet water distribution pipes 50 correspond one-to-one with the multiple inlet water distribution pipes 30 in the vertical direction; a heat exchange tube group is provided between each corresponding inlet water distribution pipe 30 and outlet water distribution pipe 50.

[0031] Multiple inlet water distribution pipes 30 and outlet water distribution pipes 50 are installed so that the inner cavity of the boiler tube box 10 is covered as much as possible by the inlet water distribution pipes 30, outlet water distribution pipes 50 and heat exchange tube groups, thereby increasing the heat exchange area and achieving the purpose of increasing heat exchange efficiency.

[0032] like Figure 3 As shown, in this embodiment of the invention, the inlet water distribution pipeline 30 includes a first water distribution pipeline 31 and a second water distribution pipeline 32 arranged in parallel and spaced apart. The first water distribution pipeline 31 is located below the second water distribution pipeline 32, and the first water distribution pipeline 31 and the second water distribution pipeline 32 are staggered. The outlet water distribution pipeline 50 includes a third water distribution pipeline 51 and a fourth water distribution pipeline 52 arranged in parallel and spaced apart. The third water distribution pipeline 51 is located above the fourth water distribution pipeline 52, and the third water distribution pipeline 51 and the fourth water distribution pipeline 52 are staggered. The first water distribution pipeline 31 and the third water distribution pipeline 51 are vertically aligned, and the second water distribution pipeline 32 and the fourth water distribution pipeline 52 are vertically aligned. A heat exchange tube assembly is connected between the first water distribution pipeline 31 and the third water distribution pipeline 51, and a heat exchange tube assembly is connected between the second water distribution pipeline 32 and the fourth water distribution pipeline 52.

[0033] In this embodiment of the invention, a first water distribution pipe 31 and a second water distribution pipe 32 with an upper and lower structure, as well as a third water distribution pipe 51 and a fourth water distribution pipe 52 with an upper and lower structure, are provided to ensure that the water volume and heat load of each water distribution pipe are balanced as much as possible.

[0034] Preferably, there are multiple first water distribution pipes 31, second water distribution pipes 32, third water distribution pipes 51 and fourth water distribution pipes 52, and these multiple first water distribution pipes 31, second water distribution pipes 32, third water distribution pipes 51 and fourth water distribution pipes 52 are arranged in parallel and spaced apart from each other.

[0035] Setting up multiple first water distribution pipes 31, second water distribution pipes 32, third water distribution pipes 51 and fourth water distribution pipes 52 can increase the heat exchange area in the inner cavity of the boiler tube box 10 in this embodiment and improve the heat exchange efficiency.

[0036] like Figure 1 and Figure 2 As shown, the heat exchange tube assembly includes at least one heat exchange tube 61, which is arranged vertically. The two ends of the heat exchange tube 61 are respectively connected to the corresponding inlet water distribution pipe 30 and outlet water distribution pipe 50. In this embodiment of the invention, there are multiple heat exchange tubes 61, and these multiple heat exchange tubes 61 are spaced apart along the length of the inlet water distribution pipe 30. Since the inner cavity of the boiler tube box 10 in this embodiment is circular, the lengths of the multiple inlet water distribution pipes 30 on its cross-section are different. In this embodiment, different numbers of boiler tube boxes 10 can be selected according to the length of the inlet water distribution pipes 30.

[0037] like Figure 4 As shown, heat exchange tubes 61 are also provided with heat dissipation fins 62, the length direction of which is parallel to the axial direction of heat exchange tubes 61. The heat exchange fins increase the heat exchange area of ​​each heat exchange tube 61, thereby improving the overall heat exchange efficiency of the device.

[0038] It should be noted that sealing components are installed at the perforations of the inlet water distribution pipe 30 and the boiler tube box 10; sealing components are also installed at the perforations of the outlet water distribution pipe 50 and the boiler tube box 10. The installation of sealing components increases the overall airtightness of the device, ensuring that no flue gas escapes during the heat exchange process.

[0039] Furthermore, an anti-wear steel plate 70 is provided on the side of the outlet water distribution pipe 50 facing the top of the boiler tube box 10. This anti-wear steel plate 70 is located on the windward side of the outlet water distribution pipe 50 (see reference). Figure 5 and Figure 6 As shown in the figure, the area of ​​the wear-resistant steel plate 70 is larger than the windward area of ​​the water outlet distribution pipe 50, so that the windward side of the water outlet distribution pipe 50 is completely covered. The wear-resistant steel plate 70 can reduce the wear of the dust-laden high-temperature flue gas on the windward side of the boiler water outlet distribution pipe 50 and increase the service life of the device.

[0040] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects: The embodiments of the present invention set the inner cavity cross-section of the boiler tube box 10 to be circular, which can eliminate local stress concentration in the boiler tube box 10, improve the uniformity of airflow distribution of flue gas in the waste heat boiler, avoid local deposition of soot, and the heat exchange tube group set along the axial direction of the boiler tube box 10 can increase the heat exchange efficiency of the overall device.

[0041] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical features and technical solutions, and technical solutions in this invention can be freely combined and used.

Claims

1. A waste heat boiler, characterized in that, include: The boiler tube box (10) has a cylindrical structure and the inner cavity of the boiler tube box (10) has a circular cross-section; The inlet header (20) is located on the lower outer side of the boiler tube box (10); The water inlet distribution pipe (30) is installed inside the boiler tube box (10) and one end of the water inlet distribution pipe (30) is connected to the water inlet header (20); The outlet water header (40) is located on the upper outer side of the boiler tube box (10); The water outlet distribution pipe (50) is installed inside the boiler tube box (10) and one end of the water outlet distribution pipe (50) is connected to the water outlet header (40); The heat exchange tube assembly is arranged in the inner cavity along the axial direction of the boiler tube box (10). The lower end of the heat exchange tube assembly is connected to the inlet water distribution pipeline (30), and the upper end of the heat exchange tube assembly is connected to the outlet water distribution pipeline (50). The inlet manifold (20) and the outlet manifold (40) have the same cross-sectional shape and are both fan-shaped structures; The water inlet distribution pipeline (30) includes a first water distribution pipeline (31) and a second water distribution pipeline (32) arranged in parallel and spaced apart. The first water distribution pipeline (31) is located below the second water distribution pipeline (32), and the first water distribution pipeline (31) and the second water distribution pipeline (32) are staggered. The water distribution pipeline (50) includes a third water distribution pipeline (51) and a fourth water distribution pipeline (52) arranged in parallel and spaced apart. The third water distribution pipeline (51) is located above the fourth water distribution pipeline (52), and the third water distribution pipeline (51) and the fourth water distribution pipeline (52) are staggered. The first water distribution pipeline (31) corresponds to the third water distribution pipeline (51) in the vertical direction, and the second water distribution pipeline (32) corresponds to the fourth water distribution pipeline (52) in the vertical direction. The heat exchange tube assembly is connected between the first water distribution pipeline (31) and the third water distribution pipeline (51), and the heat exchange tube assembly is connected between the second water distribution pipeline (32) and the fourth water distribution pipeline (52). The heat exchange tube assembly includes at least one heat exchange tube (61), which is arranged vertically. The two ends of the heat exchange tube (61) are respectively connected to the corresponding inlet water distribution pipe (30) and outlet water distribution pipe (50). Heat exchange tube (61) is also provided with heat dissipation fins (62), the length direction of which is parallel to the axial direction of heat exchange tube (61).

2. The waste heat boiler according to claim 1, characterized in that, There are two inlet headers (20), which are symmetrically arranged on the lower outer side of the boiler tube box (10). The inlet water distribution pipe (30) passes through the boiler tube box (10) and the two ends of the inlet water distribution pipe (30) are respectively connected to the two inlet headers (20).

3. The waste heat boiler according to claim 2, characterized in that, There are two outlet headers (40), which are symmetrically arranged on the upper outer side of the boiler tube box (10). The outlet water distribution pipe (50) passes through the boiler tube box (10) and the two ends of the outlet water distribution pipe (50) are respectively connected to the two outlet headers (40).

4. The waste heat boiler according to claim 3, characterized in that, The water inlet and distribution pipeline (30) consists of multiple pipes, which are evenly distributed parallel to each other along the cross-sectional direction of the lower end of the boiler tube box (10); There are multiple outlet water distribution pipes (50), which are evenly distributed in parallel along the cross-sectional direction of the upper end of the boiler tube box (10), and the multiple outlet water distribution pipes (50) correspond one-to-one with the multiple inlet water distribution pipes (30) in the vertical direction. Each group of inlet water distribution pipes (30) and outlet water distribution pipes (50) is equipped with the heat exchange tube group.

5. The waste heat boiler according to claim 1, characterized in that, The first water distribution pipeline (31), the second water distribution pipeline (32), the third water distribution pipeline (51) and the fourth water distribution pipeline (52) are all multiple, and the multiple first water distribution pipelines (31), second water distribution pipelines (32), third water distribution pipelines (51) and fourth water distribution pipelines (52) are arranged in parallel and spaced apart from each other.

6. The waste heat boiler according to claim 1, characterized in that, A sealing component is provided at the perforation of the water inlet distribution pipe (30) and the boiler tube box (10); a sealing component is also provided at the perforation of the water outlet distribution pipe (50) and the boiler tube box (10).

7. The waste heat boiler according to any one of claims 1 to 6, characterized in that, A wear-resistant steel plate (70) is installed on the side of the water outlet pipe (50) facing the top of the boiler tube box (10).

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