Heat exchanger for heating materials in an anaerobic fermentation reaction

Abstract

The utility model discloses an anaerobic fermentation reaction material heating heat exchanger relates to anaerobic fermentation equipment technical field. It includes benchmark axle, first spiral piece, second spiral piece and shell, and the coaxial double spiral piece of same outer diameter is set to the outer periphery of benchmark axle, and the circumferential opposite angle of two spiral pieces is 170 190 DEG, and the independent hot water passage and material passage are formed with shell cooperation, and two channel input mouth are located at the both ends of shell respectively, and adopt counterflow heat exchange design. The outer cylinder of shell is equipped with the hot water passage that ventilating branch pipe and ventilating main pipe intercommunication, and the flange is equipped to each channel port, and the ball valve is equipped to ventilating main pipe port. The heat exchanger passes through double spiral structure and increases the heat exchange area, avoids the solid residue accumulation in material, is applicable to large and medium -sized marsh gas mesophilic anaerobic fermentation tank, can promote the activity of methanogenic microorganism, improves marsh gas production, and reduces heating cost.

Description

Technical Field

[0001] This utility model relates to the technical field of anaerobic fermentation equipment, specifically to a heat exchanger for heating materials in an anaerobic fermentation reaction. Background Technology

[0002] Traditional heat exchangers have small heat exchange channels, while anaerobic fermentation materials contain a certain amount of solid residue or fiber, which easily adheres and accumulates in the channels, causing blockage and affecting the continuity of heat exchange.

[0003] Traditional heat exchangers have limited heat exchange area, making it difficult to achieve uniform heating of materials and resulting in low heat exchange efficiency. This increases the heating cost of anaerobic fermentation and fails to meet the demand for increased biogas production. Utility Model Content

[0004] To address the aforementioned technical problems, this application solves the problem that traditional heat exchangers have small heat exchange channel diameters, while anaerobic fermentation materials contain a certain amount of solid residues or fibers, which easily adhere and accumulate in the channels, leading to channel blockage and affecting the continuity of heat exchange.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a heat exchanger for heating materials in an anaerobic fermentation reaction, comprising a reference shaft, a first spiral blade, a second spiral blade, and a shell. The outer peripheral wall of the reference shaft is fitted with a first spiral blade arranged spirally in the axial direction, and the outer peripheral wall of the reference shaft is also fitted with a second spiral blade that is coaxial with the first spiral blade and arranged spirally in the axial direction.

[0006] Furthermore, the outer diameters of the first spiral blade and the second spiral blade are the same, and the circumferential relative angle between the first spiral blade and the second spiral blade is set to 170°-190°;

[0007] Furthermore, a housing is fitted around the outer periphery of the first and second spiral blades. The reference shaft, the first spiral blade, the second spiral blade, and the housing work together to form two independent spiral channels, namely a hot water channel and a material channel.

[0008] To better realize this utility model, the inlet of the hot water channel and the inlet of the material channel are respectively located at the two ends of the outer shell.

[0009] To better realize this utility model, the outer shell further includes an outer cylinder, and multiple ventilating branch pipes are provided on the upper side of the outer peripheral wall of the outer cylinder, which are equally spaced along the axial direction. The input ends of the multiple ventilating branch pipes are vertically downward connected to the interior of the hot water channel, and the output ends of the multiple ventilating branch pipes extend vertically upward to the interior of the main ventilating pipe.

[0010] To better realize this utility model, further, a hot water channel inlet and a material channel inlet are independently provided on one end face of the outer cylinder, and a hot water channel outlet and a material channel outlet are independently provided on the other end face of the outer cylinder;

[0011] The input end of the hot water channel is connected to the hot water channel inlet, and the output end of the hot water channel is connected to the hot water channel outlet. The input end of the material channel is connected to the material channel outlet, and the output end of the material channel is connected to the material channel inlet.

[0012] To better realize this utility model, the outer diameter of the reference shaft is further defined as 114 mm.

[0013] To better realize this utility model, the outer diameter of both the first spiral blade and the second spiral blade is 426mm.

[0014] To better realize this utility model, the circumferential relative angle between the first spiral blade and the second spiral blade is further set to 180°.

[0015] To better realize this utility model, the pitch between adjacent spiral peaks of the first spiral blade and the second spiral blade is 174mm, and the axial spacing between adjacent spirals of the first spiral blade and the second spiral blade is 76-86mm.

[0016] To better realize this utility model, the inlet and outlet of the hot water channel, the inlet and outlet of the material channel are all provided with flanges.

[0017] To better realize this utility model, ball valves are further provided at both ends of the vent pipe.

[0018] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0019] 1. In this utility model, the double helix structure design maximizes the heat exchange contact area and optimizes the internal space layout of the channel. On the one hand, it extends the heat exchange path between hot water and materials, and on the other hand, it avoids residue accumulation caused by narrow channels.

[0020] 2. In this utility model, the countercurrent heat exchange and port layout enable hot water and materials to flow in opposite directions along the axial direction. The two channel inlets are located at both ends of the outer shell, maximizing the temperature gradient between the hot and cold media, improving heat transfer efficiency, and reducing heat loss.

[0021] 3. In this utility model, the ventilation system and its supporting structure, the ventilation branch pipe is connected to the hot water channel through the main pipe, and the port is fitted with a flange and a ball valve to promptly discharge excess gas in the hot water channel and avoid air blockage affecting heat exchange; the flange facilitates equipment installation and disassembly, and the ball valve precisely controls the ventilation volume, improving equipment operation safety, simplifying maintenance operations, adapting to ventilation requirements under different working conditions, and enhancing the practicality of the equipment.

[0022] 4. In this utility model, the size parameters are matched, with a reference shaft outer diameter of 114mm, a spiral blade outer diameter of 426mm, a pitch of 174mm, and an axial spacing of 76-86mm. The design balances heat exchange efficiency and anti-clogging performance while ensuring structural strength. It is suitable for fermentation materials containing solid residues, reduces the failure rate during long-term operation, extends the service life of the equipment, and meets the large-scale production needs of large and medium-sized fermenters. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0026] Figure 3 for Figure 1 Side view;

[0027] Figure 4 for Figure 3 Sectional view at point WW;

[0028] Figure 5 for Figure 3 Cross-sectional view at the QQ section;

[0029] Figure 6 This is a schematic diagram of the structure of the reference shaft in this utility model;

[0030] Figure 7 This is a schematic diagram showing the fit between the reference shaft, the first spiral blade, and the second spiral blade in this utility model;

[0031] Figure 8 for Figure 1 Perspective view.

[0032] Explanation of reference numerals in the attached drawings: 100-reference axis; 200-first spiral blade; 300-second spiral blade; A-hot water channel; B-material channel; 401-outer cylinder; 402-ventilation branch pipe; 403-ventilation main pipe; 404-hot water channel inlet; 405-hot water channel outlet; 406-material channel inlet; 407-material channel outlet. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] Example 1

[0040] like Figures 1 to 8 As shown, a heat exchanger for heating materials in an anaerobic fermentation reaction includes a reference shaft 100, a first spiral blade 200, a second spiral blade 300, and a shell. The outer peripheral wall of the reference shaft 100 is fitted with the first spiral blade 200 spirally arranged in the axial direction, and the outer peripheral wall of the reference shaft 100 is also fitted with the second spiral blade 300 coaxial with the first spiral blade 200 and spirally arranged in the axial direction.

[0041] Furthermore, the outer diameters of the first spiral blade 200 and the second spiral blade 300 are the same, and the circumferential relative angle between the first spiral blade 200 and the second spiral blade 300 is set to 170°-190°;

[0042] Furthermore, a housing is fitted around the outer periphery of the first spiral blade 200 and the second spiral blade 300. The reference shaft 100, the first spiral blade 200, the second spiral blade 300, and the housing work together to form two independent spiral channels, namely hot water channel A and material channel B.

[0043] like Figures 1 to 8 As shown, in this embodiment, the inlet of the hot water channel A and the inlet of the material channel B are respectively located at the two ends of the outer shell.

[0044] like Figures 1 to 8 As shown, in this embodiment, the outer shell includes an outer cylinder 401. Multiple ventilated branch pipes 402 are arranged at equal intervals along the axial direction on the upper side of the outer peripheral wall of the outer cylinder 401. The input ends of the multiple ventilated branch pipes 402 are vertically downward connected to the interior of the hot water channel A, and the output ends of the multiple ventilated branch pipes 402 extend vertically upward to the interior of the main ventilated pipe 403.

[0045] like Figures 1 to 8 As shown, in this embodiment, a hot water channel inlet 404 and a material channel inlet 406 are independently provided on one end face of the outer cylinder 401, and a hot water channel outlet 405 and a material channel outlet 407 are independently provided on the other end face of the outer cylinder 401.

[0046] The input end of the hot water channel A is connected to the hot water channel inlet 404, and the output end of the hot water channel A is connected to the hot water channel outlet 405. The input end of the material channel B is connected to the material channel outlet 407, and the output end of the material channel B is connected to the material channel inlet 406.

[0047] like Figures 1 to 8 As shown, in this embodiment, the outer diameter of the reference shaft 100 is 114 mm.

[0048] like Figures 1 to 8 As shown, in this embodiment, the outer diameter of both the first spiral blade 200 and the second spiral blade 300 is 426 mm.

[0049] like Figures 1 to 8 As shown, in this embodiment, the circumferential relative angle between the first spiral plate 200 and the second spiral plate 300 is set to 180°.

[0050] like Figures 1 to 8 As shown, in this embodiment, the pitch between adjacent spiral peaks of the first spiral blade 200 and the second spiral blade 300 is 174 mm, and the axial spacing between adjacent spirals of the first spiral blade 200 and the second spiral blade 300 is 76-86 mm.

[0051] like Figures 1 to 8 As shown in this embodiment, the inlet and outlet of the hot water channel A, the inlet and outlet of the material channel B are all equipped with flanges.

[0052] like Figures 1 to 8 As shown in this embodiment, ball valves are provided at both ends of the main vent pipe 403.

[0053] In addition, the thickness of the first spiral blade 200, the second spiral blade 300, and the outer cylinder 401 are selected according to the actual situation (for example, the thickness of the first spiral blade 200 and the second spiral blade 300 is 6mm). The selection of the vent branch pipe 402 is DN20-DN32, and the selection of the vent main pipe 403 is DN32-DN50. In order to ensure the full utilization of heat, the outer peripheral wall of the outer cylinder 401 and the exterior of the hot water channel inlet 404, hot water channel outlet 405, material channel inlet 406, and material channel outlet 407 can all be wrapped with a layer of heat insulation material; the vent main pipe 403 can not only discharge excess gas, but also serve as the foundation for suspension.

[0054] Working principle:

[0055] This invention is applicable to medium and large-sized mesophilic anaerobic digesters for biogas production, specifically for scenarios where the raw materials need to be heated to enhance the activity of methanogenic microorganisms within the digester. The aim is to increase biogas production.

[0056] In order to raise the temperature of the material in the fermenter and reduce the heating cost of the heat exchange system, the heat exchange area needs to be as large as possible during the heating process. Therefore, a double-helix double-channel method is selected.

[0057] In this invention, the first spiral blade 200 and the second spiral blade 300 have the same outer diameter, the circumferential relative angle between them is set to 170°-190°, the outer diameter of both is 426mm, the pitch between adjacent spiral peaks of each blade is 174mm, and the axial spacing between adjacent spirals is 76-86mm. This design maximizes the contact area and minimizes the potential accumulation of solid residues or fibers (traditional heat exchange channels have excessively small diameters. Furthermore, because the fermentation material used in this invention differs from water, it contains a certain amount of solid residues or fibers, making it impossible for traditional heat exchangers to effectively achieve uniform heat exchange under these conditions, and the diameter of the heat exchange tubes may also lead to residue accumulation).

[0058] The first spiral blade 200 and the second spiral blade 300 are welded to the reference shaft 100. Hot water is transported in the hot water channel A and material is transported in the material channel B.

[0059] Heating Process Description: The hot water channel A and material channel B of this invention adopt a counter-current heat exchange design. This maximizes heat exchange efficiency through the reverse flow of the two media, while a double-helix structure ensures stable operation. The flow direction of hot water channel A is as follows: it enters from the hot water channel inlet 404 at one end of the outer cylinder, flows along the spiral path of hot water channel A, and exits from the hot water channel outlet 405 at the other end of the outer cylinder. The flow direction of material channel B is as follows: it enters from the material channel outlet 407 at the other end of the outer cylinder (opposite to the hot water inlet), flows along the spiral path formed by material channel B, and exits from the material channel inlet 406 at one end of the outer cylinder. The two media flow in parallel and opposite directions axially within the double-helix channel, maintaining a counter-current state throughout the entire process where the flow directions of hot water and material are opposite.

[0060] The heat exchanger is installed on the equipment foundation. The pump connects the fermenter and the heat exchanger, and the hot water pump connects the hot water boiler and the heat exchanger. The hot water pump and the material pump are installed on both sides of the heat exchanger, causing the material and hot water inside the heat exchanger to flow in opposite directions. The flow rate of the material in the hot water channel A and the material channel B is controlled (the flow rates of both hot water and material can be determined according to actual needs). Different materials require different minimum flow rates.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat exchanger for heating materials in an anaerobic fermentation reaction, characterized in that: It includes a reference shaft (100), a first spiral blade (200), a second spiral blade (300), and a housing. The outer peripheral wall of the reference shaft (100) is fitted with a first spiral blade (200) arranged spirally in the axial direction. The outer peripheral wall of the reference shaft (100) is also fitted with a second spiral blade (300) that is coaxial with the first spiral blade (200) and arranged spirally in the axial direction. Furthermore, the outer diameters of the first spiral blade (200) and the second spiral blade (300) are the same, and the circumferential relative angle between the first spiral blade (200) and the second spiral blade (300) is set to 170°-190°; Furthermore, a housing is fitted around the outer periphery of the first spiral blade (200) and the second spiral blade (300). The reference shaft (100), the first spiral blade (200), the second spiral blade (300) and the housing work together to form two independent spiral channels, namely the hot water channel (A) and the material channel (B).

2. The heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 1, characterized in that: The inlet of the hot water channel (A) and the inlet of the material channel (B) are respectively located at the two ends of the outer shell.

3. A heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 2, characterized in that: The outer shell includes an outer cylinder (401). Multiple ventilated branch pipes (402) are arranged at equal intervals along the axial direction on the upper side of the outer peripheral wall of the outer cylinder (401). The input ends of the multiple ventilated branch pipes (402) are vertically downward connected to the interior of the hot water channel (A), and the output ends of the multiple ventilated branch pipes (402) extend vertically upward to the interior of the main ventilated pipe (403).

4. A heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 3, characterized in that: The outer cylinder (401) has a hot water channel inlet (404) and a material channel inlet (406) independently provided on one end face, and a hot water channel outlet (405) and a material channel outlet (407) independently provided on the other end face. The input end of the hot water channel (A) is connected to the hot water channel inlet (404), the output end of the hot water channel (A) is connected to the hot water channel outlet (405), the input end of the material channel (B) is connected to the material channel outlet (407), and the output end of the material channel (B) is connected to the material channel inlet (406).

5. A heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 4, characterized in that: The outer diameter of the reference shaft (100) is 114 mm.

6. A heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 5, characterized in that: The outer diameter of both the first spiral blade (200) and the second spiral blade (300) is 426 mm.

7. A heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 6, characterized in that: The circumferential relative angle between the first spiral blade (200) and the second spiral blade (300) is set to 180°.

8. A heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 7, characterized in that: The pitch between adjacent spiral peaks of the first spiral blade (200) and the second spiral blade (300) is 174 mm, and the axial spacing between adjacent spirals of the first spiral blade (200) and the second spiral blade (300) is 76-86 mm.

9. A heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 8, characterized in that: Flanges are provided at the inlet and outlet of the hot water channel (A), the inlet and outlet of the material channel (B).

10. A heat exchanger for heating materials in an anaerobic fermentation reaction according to claim 9, characterized in that: Both ends of the main vent pipe (403) are equipped with ball valves.

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