Heating pipeline of biomass boiler

Abstract

The utility model discloses a heating pipeline of a biomass boiler, the heating pipeline comprises an inner membrane type wall and an outer membrane type wall sleeved on the outer side of the inner membrane type wall, the bottoms of the inner membrane type wall and the outer membrane type wall are communicated with a lower collecting pipe, the tops of the inner membrane type wall and the outer membrane type wall are communicated with an upper collecting pipe, a plurality of gas collecting pipes are uniformly distributed on the top of the upper collecting pipe, and the gas collecting pipes are communicated with the inner membrane type wall and the outer membrane type wall. The included angle between the gas collecting pipe and the horizontal direction is an acute angle, and the length of the inclined section of the gas collecting pipe is larger than that of the vertical section of the gas collecting pipe. The gas-water separator has the beneficial effects that the inclined gas collecting pipe is designed, so that a gas-water mixture can be uniformly distributed along the length direction of the gas collecting pipe, overhigh local flow velocity is avoided, and the separation efficiency is improved; meanwhile, the inclined section of the gas collecting pipe is longer than the vertical section, so that the separation process of steam and water in the gas collecting pipe is further prolonged, and steam and water separation is facilitated.

Description

Technical Field

[0001] This utility model belongs to the technical field of heating pipes for biomass boilers with membrane wall structures, and particularly relates to a heating pipe system for a biomass boiler. Background Technology

[0002] For biomass boilers with membrane wall structures, the unstable calorific value of biomass fuel leads to fluctuations in steam pressure. For example, if the steam pressure jumps between 1.0 and 4.0 MPa, it will cause an imbalance in the two-phase flow within the separator where water and steam are separated in the membrane wall, resulting in chaotic water and steam, causing a sharp drop in separation efficiency and excessive humidity. At the same time, water hammer will also occur, impacting the pipeline and causing unqualified steam separation with excessive moisture in the steam. To address this issue, existing technology adds a steam pressure stabilizing tank at the separator inlet to smooth out pressure fluctuations; however, this solution increases the amount of auxiliary equipment in the boiler and complicates its structure. Summary of the Invention

[0003] The purpose of this utility model embodiment is to provide a heating pipeline for a biomass boiler, aiming to solve the technical problem in the prior art of membrane wall biomass boilers where adding a steam pressure stabilizing tank at the separator inlet to smooth pressure fluctuations improves unqualified steam separation and causes the boiler to have excessive moisture content, resulting in an increase in auxiliary equipment and a complex structure.

[0004] The present invention is implemented as follows:

[0005] A heating pipeline for a biomass boiler includes an inner membrane wall and an outer membrane wall sleeved outside the inner membrane wall. The inner and outer membrane walls are connected to a lower manifold at the bottom and to an upper manifold at the top. Several gas collecting pipes are evenly distributed on the top of the upper manifold, and the top of each gas collecting pipe is connected to a gas collecting chamber. The angle between the gas collecting pipe and the horizontal direction is an acute angle, and the length of the inclined section of the gas collecting pipe is greater than the length of the vertical section.

[0006] Furthermore, the inclined section of the gas collection pipe includes an inner layer and an outer layer, which are connected and fixed by a connecting rib 602. The surface of the inner layer has multiple small holes or gaps, and a gap for steam flow is provided between the inner layer and the outer layer.

[0007] Furthermore, the small holes are provided at least twelve times and are evenly distributed circumferentially in the inner wall.

[0008] Furthermore, the small hole is located within the gap.

[0009] Furthermore, the small hole is located between two adjacent slits 606.

[0010] Furthermore, the angle between the gas collecting tube and the horizontal direction is an acute angle, and the acute angle ranges from 5° to 20°.

[0011] Furthermore, the acute angle ranges from 10° to 15°.

[0012] Furthermore, the length of the inclined section of the gas collecting pipe is at least three times the length of the vertical section, and the vertical section and the inclined section are connected by a corner.

[0013] Furthermore, the gas collection bag is located above the center of the inner membrane wall, and the gas collection pipes are evenly arranged around the gas collection bag.

[0014] Furthermore, the gas collecting bag is cylindrical, with its axis perpendicular to the axis of the inner membrane wall. The lengths of the gas collecting pipes are all different, with the shortest gas collecting pipe having an inclined section that is at least three times the length of its vertical section.

[0015] The positive effects of this invention are: the inclined gas collecting pipe design allows the steam-water mixture to be evenly distributed along the length of the pipe, avoiding excessively high local flow velocities and improving separation efficiency; at the same time, the length of the inclined section of the gas collecting pipe is greater than the length of the vertical section, which further prolongs the process of steam-water separation in the gas collecting pipe, which is beneficial to water-vapor separation.

[0016] Furthermore, since the gas collecting pipe is located between the upper manifold and the gas collecting chamber, it is still within the heating space. Continuous heating further promotes steam-water separation. By improving the gas collecting pipe, utilizing the acute angle between the gas collecting pipe and the horizontal direction, and the fact that the length of the inclined section of the gas collecting pipe is greater than the length of the vertical section, and the inclined section of the gas collecting pipe includes an inner and outer layer, the existing technology of adding a steam pressure stabilizing tank is replaced, thus smoothing pressure fluctuations and achieving structural simplification. This also solves the technical problem in the existing biomass boiler with membrane wall structure where adding a steam pressure stabilizing tank at the separator inlet to smooth pressure fluctuations improves steam separation, resulting in an increase in auxiliary equipment and a complex structure when the steam contains excessive moisture. Attached Figure Description

[0017] Figure 1 This is a front view of the heating pipes of a biomass boiler according to this utility model;

[0018] Figure 2 yes Figure 1 The figure shows a cross-sectional view along line AA of the heating pipes of a biomass boiler according to this utility model;

[0019] Figure 3 yes Figure 1 The diagram shows a three-dimensional structural schematic of the heating pipes of a biomass boiler according to this utility model.

[0020] Figure 4 yes Figure 3The diagram shows a cross-sectional view of the gas collecting pipe of the heating pipeline of a biomass boiler according to this utility model.

[0021] Legend: 1—Lower manifold, 2—Inner membrane wall, 3—Outer membrane wall, 4—Burner mounting hole, 5—Upper manifold, 6—Gas collection pipe, 601—Outer layer, 602—Connecting rib, 603—Gap, 604—Inner layer, 605—Small hole, 606—Gap, 7—Gas collection bag. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] 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. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] like Figure 1 The diagram shown is a structural diagram of a heating pipeline for a biomass boiler provided in an embodiment of this utility model. The heating pipeline includes an inner membrane wall and an outer membrane wall sleeved outside the inner membrane wall. The inner membrane wall 2 and the outer membrane wall 3 are connected to the lower manifold 1 at the bottom and to the upper manifold 5 at the top. Several gas collecting pipes 6 are evenly distributed on the top of the upper manifold 5. The top of each gas collecting pipe 6 is connected to a gas collecting bag 7. The angle between the gas collecting pipe 6 and the horizontal direction is an acute angle, and the length of the inclined section of the gas collecting pipe 6 is greater than the length of the vertical section.

[0026] The gas collecting pipe 6 has an acute angle with the horizontal direction and is provided with an inclined section and a vertical section. The inclined section of the gas collecting pipe 6 includes an inner layer 604 and an outer layer 601. The inner layer 604 and the outer layer 601 are connected and fixed by a connecting rib 602. The surface of the inner layer 604 has multiple small holes 605 or gaps 606. There is a gap 603 for steam flow between the inner layer 604 and the outer layer 601. Steam enters the gap 603 of the gas collecting pipe through the small holes 605, while water flows back down along the gap 606 due to gravity, achieving preliminary separation.

[0027] Therefore, the inclined gas collecting pipe design allows the steam-water mixture to be evenly distributed along the length of the pipe, avoiding excessively high local flow velocities and improving separation efficiency. At the same time, the length of the inclined section of the gas collecting pipe is greater than the length of the vertical section, which further prolongs the separation process of steam and water in the gas collecting pipe, which is beneficial to water-vapor separation.

[0028] Furthermore, since the gas collecting pipe is located between the upper collecting pipe and the gas collecting manifold, it is still within the heating space. Continuous heating further promotes steam-water separation. By improving the gas collecting pipe, utilizing the acute angle between the gas collecting pipe 6 and the horizontal direction, and the fact that the length of the inclined section of the gas collecting pipe 6 is greater than the length of the vertical section, and the inclined section of the gas collecting pipe 6 includes an inner layer 604 and an outer layer 601, the existing technology of adding a steam pressure stabilizing tank is replaced, thus smoothing pressure fluctuations and achieving structural simplification. This solves the technical problem in the existing biomass boiler with membrane wall structure where adding a steam pressure stabilizing tank at the separator inlet to smooth pressure fluctuations improves steam separation quality and causes an increase in auxiliary equipment and structural complexity when the steam contains excessive moisture.

[0029] Preferably, there are at least twelve holes 605, which are evenly distributed circumferentially in the wall of the inner layer 604.

[0030] Preferably, the small hole 605 is located within the gap 606.

[0031] Preferably, the small hole 605 is located between the two gaps 606.

[0032] Preferably, the angle between the gas collecting tube 6 and the horizontal direction is an acute angle, and the acute angle ranges from 5° to 20°.

[0033] Preferably, the acute angle is in the range of 10° to 15°.

[0034] Preferably, the length of the inclined section of the gas collecting pipe 6 is at least three times the length of the vertical section. The vertical section is established by utilizing the corner between the vertical section and the inclined section, as well as the space of the upper collecting pipe, to eliminate the influence of water hammer on the gas-water separation in the inclined section of the gas collecting pipe 6.

[0035] Preferably, the gas collecting bag 7 is located above the center of the inner membrane wall 2, and the gas collecting pipes are evenly arranged around the gas collecting bag 7.

[0036] Preferably, the air collecting bag 7 is cylindrical, the axis of the air collecting bag 7 is perpendicular to the axis of the inner membrane wall 2, and the lengths of the air collecting pipes 6 are different, wherein the length of the inclined section of the shortest air collecting pipe 6 is at least three times the length of the vertical section.

[0037] The foregoing has broadly outlined some aspects and features of the various embodiments and should be interpreted as merely illustrative of potential applications. Other beneficial results can be obtained by applying the disclosed information in different ways or by combining aspects of the disclosed embodiments. Further aspects and a more complete understanding can be obtained based on the detailed description of exemplary embodiments with reference to the accompanying drawings, within the scope defined by the claims.

[0038] The above embodiments provide a detailed description of the present invention. Of course, the above description is not intended to limit the present invention, nor is the present invention limited to the examples described above. Any changes, modifications, additions, reductions, or substitutions made by those skilled in the art within the scope of the present invention are also within the protection scope of the present invention.

Claims

1. A heating circuit of a biomass boiler, characterized in that, The heating pipeline comprises an inner membrane wall and an outer membrane wall sleeved outside the inner membrane wall, the inner membrane wall and the outer membrane wall are communicated with the lower header at the bottom, and the inner membrane wall and the outer membrane wall are communicated with the upper header at the top, the top of the upper header is uniformly distributed with a plurality of gas collecting pipes, the top end of the gas collecting pipe is communicated with the gas collecting bag, the included angle between the gas collecting pipe and the horizontal direction is an acute angle, and the length of the inclined section of the gas collecting pipe is greater than the length of the vertical section; the inclined section of the gas collecting pipe comprises an inner layer and an outer layer, the inner layer and the outer layer are connected and fixed through connecting ribs, a plurality of small holes or slits are formed on the surface of the inner layer, and a steam flow gap is arranged between the inner layer and the outer layer.

2. The heating circuit of a biomass boiler according to claim 1, characterized in that, The small holes are at least twelve and are circumferentially distributed in the wall of the inner layer.

3. The heating circuit of a biomass boiler according to claim 2, characterized in that, The small holes are located in the slits.

4. The heating circuit of a biomass boiler according to claim 3, characterized in that, The small holes are located between two adjacent slits.

5. The heating circuit of a biomass boiler according to any of claims 1 to 4, characterized in that, The acute angle is in the range of 5° to 20°.

6. The heating circuit of a biomass boiler according to claim 5, characterized in that, The acute angle is in the range of 10° to 15°.

7. The heating circuit of a biomass boiler according to claim 6, characterized in that, The length of the inclined section of the gas collecting pipe is at least three times the length of the vertical section, and the vertical section and the inclined section are connected through an elbow.

8. The heating circuit of a biomass boiler according to claim 7, characterized in that, The gas collecting bag is located above the center of the inner membrane wall, and the gas collecting pipes are uniformly arranged around the gas collecting bag.

9. The heating circuit of a biomass boiler according to claim 8, characterized in that, The gas collecting bag is cylindrical, the axis of the gas collecting bag is perpendicular to the axis of the inner membrane wall, the lengths of the gas collecting pipes are different, and the length of the inclined section of the shortest gas collecting pipe is at least three times the length of the vertical section.

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