Heat exchanger suitable for high-solid-content viscous material

Abstract

The heat exchanger comprises a plurality of layers of first medium pipes and second medium pipes, the first medium pipes and the second medium pipes are transversely, parallelly and longitudinally arranged in a staggered mode, a plurality of bubbles are formed on the inner walls of the first medium pipes and the inner walls of the second medium pipes, and a center plate is arranged between the first medium pipes and the second medium pipes on the same layer. A first fluid and a second fluid with different temperatures are respectively introduced into the first medium pipe and the second medium pipe, and the first fluid in the first medium pipe and the second fluid in the second medium pipe reversely flow to realize heat exchange; through the special design of the flow channel and the rotating cavity and the additional arrangement of a bubbling type structure on the inner wall of the medium pipe, the convection heat transfer coefficient is further improved, the heat transfer efficiency is enhanced, and the beneficial effects of high heat exchange efficiency, small occupied area, difficulty in blockage and convenience in overhaul and maintenance are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of organic garbage treatment devices, in particular to a heat exchanger suitable for high-solid-content viscous materials. Background Art

[0002] Organic waste, such as restaurant waste, kitchen waste, urban sludge, feces, etc., has the dual characteristics of waste and resources. Rational resource utilization of organic waste is, to a certain extent, one of the effective ways to solve the problem of material and energy shortage in my country.

[0003] Among them, anaerobic digestion technology can not only process organic waste but also obtain clean energy, thereby achieving the dual effects of environmental protection and sustainable development. It is currently the most widely used organic waste treatment technology.

[0004] Temperature is an important factor affecting anaerobic digestion. Methanogenic bacteria have higher abundance and diversity at suitable temperatures of medium temperature (33-39°C) or high temperature (50-58°C), and are dominant bacteria. They can ensure the degradation rate of organic matter and methane production. Therefore, a heat exchanger is required to control the suitable temperature and temperature variation range of the anaerobic reaction.

[0005] Organic waste slurry has high impurity and solid content, and high viscosity. Currently, the commonly used heat exchangers are mainly shell-and-tube heat exchangers and spiral plate heat exchangers. Shell-and-tube heat exchangers have a low heat transfer coefficient, occupy a large area, and consume a large amount of metal per unit heat transfer surface for the same heat transfer capacity, resulting in high cost. In addition, the series inner tubes have many U-shaped elbows, which are difficult to repair and maintain. Spiral plate heat exchangers have narrow fluid channels and are prone to deposition and clogging, which greatly reduces heat transfer efficiency. Frequent clearing and cleaning are required, making repair and maintenance inconvenient, and the fluid resistance loss is large. Utility Model Content

[0006] In response to the above technical problems in the related art, the present invention proposes a heat exchanger suitable for high-solid-content viscous materials, so as to overcome the above defects of the existing heat exchanger and provide a stable temperature control function for the anaerobic digestion reaction.

[0007] In order to achieve the above technical purpose, the technical solution of the utility model is implemented as follows:

[0008] A heat exchanger suitable for high-solid-content viscous materials;

[0009] This heat exchanger suitable for high-solid-content viscous materials includes several layers of first medium tubes and second medium tubes arranged in parallel horizontally and staggered vertically. The inner walls of the first medium tubes and the second medium tubes are each formed with a plurality of bubbles. A center plate is provided between the first medium tubes and the second medium tubes in the same layer. A first fluid and a second fluid with different temperatures are respectively introduced into the first medium tube and the second medium tube. The first fluid in the first medium tube and the second fluid in the second medium tube flow in opposite directions to achieve heat exchange.

[0010] Furthermore, both ends of the first medium pipe and the second medium pipe are fixedly connected with rectangular flanges, which are arranged vertically at both ends of the first medium pipe and the second medium pipe, and both sides of the rectangular flange are bolted with flange-type rotating cavities.

[0011] Furthermore, the center plate serves as a common wall for the first medium tube and the second medium tube arranged in parallel on the same layer, and constitutes an integral part of the first medium tube and the second medium tube on the same layer.

[0012] Furthermore, the first medium tubes are arranged in parallel with the second medium tubes, and the first medium tubes are staggered and diagonally arranged at intervals, do not contact each other, and are adjacent to the second medium tubes with a common wall; the second medium tubes are staggered and diagonally arranged at intervals, do not contact each other, and are adjacent to the first medium tubes with a common wall.

[0013] Furthermore, the first medium pipes are connected in series and reversed in sequence through the flange-type rotating cavity, and the second medium pipes are connected in series and reversed in sequence through the flange-type rotating cavity; the flange-type rotating cavity includes two parallel panels and a connecting plate, and the plane shape of the flange-type rotating cavity is a truncated regular octagon.

[0014] Furthermore, the first medium pipe and the second medium pipe have the same specifications, and the first fluid and the second fluid can periodically switch the corresponding first medium pipe or second medium pipe as needed.

[0015] Furthermore, the first medium tube and the second medium tube are welded by integrally stamped and bubbled steel plates, and their cross-sections are square. The cross-sectional material flow rate of the first medium tube and the second medium tube is 0.6m / s to 2m / s; the bubble diameter is 1 / 5 to 1 / 15 of the cross-sectional side length of the first medium tube and the second medium tube, and the bubbling direction of the bottom surface of the first medium tube and the second medium tube is toward the inside to avoid deposition.

[0016] Furthermore, a thermal insulation layer is provided between the first medium pipe, the second medium pipe and the outer shell.

[0017] Furthermore, the heat exchanger suitable for high-solid-content viscous materials can be equipped with an additional number of the first medium pipes and the second medium pipes connected in series according to heat exchange requirements, or multiple heat exchangers suitable for high-solid-content viscous materials can be connected in series to form a heat exchange unit.

[0018] Furthermore, the solid content of the first fluid and the second fluid are both less than or equal to 15%.

[0019] The beneficial effects of the present invention are:

[0020] 1. The bubbling medium tube not only expands the heat transfer surface and increases the heat transfer area per unit volume, but also increases the disturbance degree of the fluid near the wall on both sides of the cold and hot media, reduces the thickness of the laminar bottom layer, continuously updates the heat transfer surface, increases the convective heat transfer coefficient, and improves the total heat transfer coefficient, thereby reducing the required heat exchange area.

[0021] 2. The design of the rotating chamber not only reduces the space required for material deflection and diversion, but also realizes local mixing in the vertical and horizontal directions in the rotating chamber while changing the flow direction of the fluid, generating vortex and enhancing the heat transfer efficiency.

[0022] 3. Both ends of the heat exchanger are connected by rectangular flanges and flange-type rotating cavity bolts, which are easy to disassemble and easy to inspect and maintain.

[0023] 4. The medium tube is a square tube with wide fluid channel, good material flowability and not easy to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the internal structure of a heat exchanger suitable for high-solid-content viscous materials according to an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the overall structure of a heat exchanger suitable for high-solid-content viscous materials according to an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of a bubbling medium tube for a heat exchanger suitable for high-solid-content viscous materials according to an embodiment of the present utility model;

[0028] Figure 4This is a schematic diagram of a rotating chamber of a heat exchanger suitable for high-solid-content viscous materials according to an embodiment of the present utility model;

[0029] In the figure: 1. first medium pipe; 11. first medium inlet; 12. first medium outlet; 2. second medium pipe; 21. second medium inlet; 22. second medium outlet; 3. center plate; 4. rectangular flange; 5. flange-type rotating chamber; 6. insulation layer; 7. outer shell; 8. bubbler. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0031] It should be understood that in the description of the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the embodiments of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0032] like Figure 1-4 As shown, according to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials includes several layers of first medium tubes 1 and second medium tubes 2 arranged in parallel horizontally and staggered vertically, and a plurality of bubbles 8 are formed on the inner walls of the first medium tubes 1 and the second medium tubes 2. A center plate 3 is provided between the first medium tubes 1 and the second medium tubes 2 in the same layer. A first fluid and a second fluid with different temperatures are respectively introduced into the first medium tubes 1 and the second medium tubes 2, and the first fluid in the first medium tube 1 and the second fluid in the second medium tube 2 flow in opposite directions to achieve heat exchange.

[0033] According to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials is described. In a specific embodiment, rectangular flanges 4 are fixedly connected to both ends of the first medium pipe 1 and the second medium pipe 2. The rectangular flanges 4 are vertically arranged at both ends of the first medium pipe 1 and the second medium pipe 2. Flange-type rotating chambers 5 are provided on both sides of the rectangular flanges 4 and are bolted.

[0034] According to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials is described. In a specific embodiment, the center plate 3 serves as a common wall of the first medium tube 1 and the second medium tube 2 arranged in parallel on the same layer, and constitutes an integral part of the first medium tube 1 and the second medium tube 2 on the same layer.

[0035] According to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials is described. In a specific embodiment, the first medium tubes 1 and the second medium tubes 2 are arranged in parallel, and the first medium tubes 1 are staggered and diagonally arranged at intervals, do not contact each other, and are adjacent to the second medium tubes 2 with a common wall; the second medium tubes 2 are staggered and diagonally arranged at intervals, do not contact each other, and are adjacent to the first medium tubes 1 with a common wall.

[0036] According to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials is described. In a specific embodiment, the first medium pipes 1 are connected in series and deflected and reversed in sequence through a flange-type rotating cavity 5, and the second medium pipes 2 are connected in series and deflected and reversed in sequence through a flange-type rotating cavity 5; the flange-type rotating cavity 5 includes two mutually parallel panels and a connecting plate, and the plane shape of the flange-type rotating cavity 5 is a truncated regular semi-octagon.

[0037] According to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials is described. In a specific embodiment, the first medium pipe 1 and the second medium pipe 2 have the same specifications, and the first fluid and the second fluid can periodically switch the corresponding first medium pipe 1 or second medium pipe 2 as needed.

[0038] According to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials is described. In a specific embodiment, the first medium tube 1 and the second medium tube 2 are welded by integrally stamped and bubbled steel plates, and their cross-sections are square. The cross-sectional material flow rate of the first medium tube 1 and the second medium tube 2 is 0.6m / s to 2m / s; the diameter of the bubble 8 is 1 / 5 to 1 / 15 of the length of the cross-sectional side of the first medium tube 1 and the second medium tube 2, and the direction of the bubble 8 on the bottom surface of the first medium tube 1 and the second medium tube 2 is toward the inside to avoid deposition.

[0039] According to a heat exchanger suitable for high-solid-content viscous materials described in an embodiment of the present invention, in a specific embodiment, a thermal insulation layer 6 is provided between the first medium pipe 1 and the second medium pipe 2 and the outer shell 7 .

[0040] According to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials is described. In a specific embodiment, the heat exchanger suitable for high-solid-content viscous materials can be equipped with an additional number of the first medium tubes 1 and the second medium tubes 2 connected in series according to heat exchange requirements, or multiple heat exchangers suitable for high-solid-content viscous materials can be connected in series to form a heat exchange unit.

[0041] According to an embodiment of the present invention, a heat exchanger suitable for high-solid-content viscous materials is described. In a specific embodiment, the solid content of the first fluid and the second fluid are both less than or equal to 15%.

[0042] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0043] In specific use, a heat exchanger suitable for high-solid-content viscous materials according to the present invention includes several first medium pipes 1, several second medium pipes 2, a center plate 3, a rectangular flange 4, a flange-type rotating cavity 5, an insulation layer 6, and an outer shell 7.

[0044] The medium pipeline is divided into two columns and multiple layers by the central plate 3, each layer including a first medium pipe 1 and a second medium pipe 2; the first medium pipe 1 is provided with a bubbler 8, and is provided with a first medium inlet 11 and a first medium outlet 12; the second medium pipe 2 is provided with a bubbler 8, and is provided with a second medium inlet 21 and a second medium outlet 22.

[0045] The rectangular flanges 4 are arranged vertically at both ends of the heat exchanger, welded to the medium pipeline, and bolted to the flange-type rotating cavity 5; the first medium tubes 1 and the second medium tubes 2 are arranged in parallel, and the first medium tubes 1 are staggered and diagonally arranged at intervals, do not contact each other, and are adjacent to the second medium tubes 2 with the same wall, and are connected in series and folded and reversed through the flange-type rotating cavity 5; the second medium tubes 2 are staggered and diagonally arranged at intervals, do not contact each other, and are adjacent to the first medium tubes 1 with the same wall, and are connected in series and folded and reversed through the flange-type rotating cavity 5.

[0046] A thermal insulation layer 6 is provided between the medium pipe and the outer shell 7 .

[0047] In a specific embodiment, the working process of the heat exchanger for high-solid-content viscous materials described in the present invention is as follows:

[0048] A first fluid and a second fluid with different temperatures are respectively introduced into the first medium pipe 1 and the second medium pipe 2 , and heat exchange is achieved by countercurrent flow.

[0049] The first fluid to be heat exchanged enters the first medium tube 1 from the inlet 11 and flows out from the outlet 12 after heat exchange; the second fluid to be heat exchanged enters the second medium tube 2 from the inlet 21 and flows out from the outlet 22 after heat exchange; heat exchange begins after the generation positions of the first fluid and the second fluid overlap. The design of the bubble 8 and the rotating cavity 5 of the first medium tube 1 and the second medium tube 2 expands the heat transfer surface, increases the heat transfer area per unit volume, and increases the disturbance degree of the fluid, thereby enhancing heat transfer and achieving higher heat exchange efficiency.

[0050] As an example, the heat exchanger of the present invention is used for slurry-to-slurry heat exchange between cold slurry from pre-treated food waste and hot slurry from food waste digestion and oil extraction. The required heat exchange power is calculated to be 870kW. The first medium is the cold slurry from food waste pulping, with a solid content of 12% to 15% and a temperature of 15 to 25°C; the second medium is the hot slurry from food waste digestion, with a solid content of 10% to 12% and a temperature of 70 to 80°C. After heat exchange in the heat exchanger, the cold slurry is heated to 35 to 45°C before entering the heating and digestion unit, while the hot slurry is cooled to 50 to 60°C for high-temperature anaerobic digestion.

[0051] As an example, the heat exchanger of this utility model is used for circulating temperature control in a medium-temperature anaerobic digestion unit for municipal sludge. The required heating power is calculated to be 450kW. The first medium is the anaerobic digestion liquid of the sludge, with a solid content of 5% to 7% and a temperature of approximately 35°C; the second medium is the generator jacket water at a temperature of approximately 80°C. After the heat exchanger heats the anaerobic digestion liquid, the temperature rises by approximately 6°C, while the jacket water temperature drops by approximately 8°C.

[0052] To sum up, with the help of the above-mentioned technical solution of the present invention, through the special design of the convection channel and the rotating cavity, and the addition of a bubbling structure on the inner wall of the medium tube, the convection heat transfer coefficient is further improved and the heat transfer efficiency is enhanced, thereby achieving the beneficial effects of high heat exchange efficiency, small footprint, not easy to clog, and easy maintenance.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heat exchanger suitable for high solid content viscous materials, characterized in that: The invention comprises a plurality of layers of first medium tubes (1) and second medium tubes (2) arranged in a transverse parallel manner and in a longitudinally staggered manner, wherein a plurality of bubbles (8) are formed on the inner walls of the first medium tubes (1) and the second medium tubes (2), a center plate (3) is provided between the first medium tubes (1) and the second medium tubes (2) in the same layer, a first fluid and a second fluid of different temperatures are respectively introduced into the first medium tubes (1) and the second medium tubes (2), and the first fluid in the first medium tube (1) and the second fluid in the second medium tube (2) flow in opposite directions to realize heat exchange.

2. A heat exchanger suitable for high solid content viscous materials according to claim 1, characterized in that: Rectangular flanges (4) are fixedly connected at both ends of the first medium pipe (1) and the second medium pipe (2). The rectangular flanges (4) are arranged vertically at both ends of the first medium pipe (1) and the second medium pipe (2). Both sides of the rectangular flanges (4) are bolted and provided with flange-type rotating cavities (5).

3. The heat exchanger suitable for high solid content viscous materials according to claim 1, characterized in that: The central plate (3) serves as a common wall for the first medium tube (1) and the second medium tube (2) arranged in parallel on the same layer, and constitutes an integral part of the first medium tube (1) and the second medium tube (2) on the same layer.

4. The heat exchanger suitable for high solid content viscous materials according to claim 1, characterized in that: The first medium tubes (1) and the second medium tubes (2) are arranged in parallel, the first medium tubes (1) are arranged diagonally at intervals, do not contact each other, and are adjacent to the second medium tubes (2) by sharing a common wall; the second medium tubes (2) are arranged diagonally at intervals, do not contact each other, and are adjacent to the first medium tubes (1) by sharing a common wall.

5. The heat exchanger suitable for high solid content viscous materials according to claim 1, characterized in that: The first medium pipes (1) are sequentially connected in series and folded and reversed through the flange-type rotating chamber (5), and the second medium pipes (2) are sequentially connected in series and folded and reversed through the flange-type rotating chamber (5); the flange-type rotating chamber (5) comprises two mutually parallel panels and a connecting plate, and the plane shape of the flange-type rotating chamber (5) is a truncated regular octagon.

6. The heat exchanger suitable for high solid content viscous materials according to claim 1, characterized in that: The first medium pipe (1) and the second medium pipe (2) have the same specifications, and the first fluid and the second fluid can periodically switch the corresponding first medium pipe (1) or second medium pipe (2) as needed.

7. The heat exchanger suitable for high solid content viscous materials according to claim 1, characterized in that: The first medium tube (1) and the second medium tube (2) are welded by integrally stamping and bubbling steel plates, and their cross sections are square. The material flow rate of the cross section of the first medium tube (1) and the second medium tube (2) is 0.6 m / s to 2 m / s. The diameter of the bubble (8) is 1 / 5 to 1 / 15 of the length of the cross section of the first medium tube (1) and the second medium tube (2). The direction of the bubble (8) on the bottom surface of the first medium tube (1) and the second medium tube (2) is toward the inside to avoid deposition.

8. The heat exchanger suitable for high-solid-content viscous materials according to claim 1, characterized in that: A thermal insulation layer (6) is provided between the first medium pipe (1), the second medium pipe (2) and the outer shell (7).

9. The heat exchanger suitable for high solid content viscous materials according to claim 1, characterized in that: The heat exchanger suitable for high-solid-content viscous materials can be equipped with an additional number of the first medium pipes (1) and the second medium pipes (2) connected in series according to heat exchange requirements, or multiple heat exchangers suitable for high-solid-content viscous materials can be connected in series to form a heat exchange unit.

10. A heat exchanger suitable for high solid content viscous materials according to any one of claims 1 to 9, characterized in that: The solid content of the first fluid and the second fluid are both less than or equal to 15%.

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