A waste heat recovery device

Abstract

The utility model provides a kind of garbage treatment heat recovery device, including slurry pool and heat exchange mechanism, the agitator is provided in the slurry pool, the heat exchange mechanism includes coil holder, heat exchange coil and coil fixed card, the heat exchange coil is fixedly assembled on the coil holder by coil fixed card, the heat exchange coil has the coil inlet and coil outlet of the slurry pool extension;The coil inlet is connected with feed pump, and the coil holder is fixedly installed in the slurry pool by detachable fixed connecting piece;The device is simple in structure, convenient to install, and can effectively improve the device jamming problem.

Description

Technical Field

[0001] This utility model relates to the field of waste treatment equipment, and in particular to a heat recovery device for organic slurry from kitchen waste, vegetable market waste, and fruit and vegetable waste. Background Technology

[0002] With the advancement of waste sorting, kitchen waste and food waste are separated from household waste. Compared with household waste, kitchen waste and food waste have the characteristics of high organic matter content, high water content, and low calorific value. Anaerobic fermentation to produce biogas from the organic matter in kitchen waste and food waste is a waste treatment method with a high recycling rate.

[0003] The commonly used organic matter is fermented using wet anaerobic fermentation, with fermentation temperatures generally ranging from 30 to 70 degrees Celsius. The pretreatment stage, based on relevant specifications and oil extraction requirements, typically involves a slurry temperature of 85 to 95 degrees Celsius. The pretreatment stage generally involves heat exchange between the slurry that needs to be heated and the slurry that needs to be cooled. Currently, the commonly used heat exchange device is the spiral plate heat exchanger. However, due to the complex structure of the spiral plate heat exchanger and the presence of residual particles in the waste slurry, the spiral plate heat exchanger is prone to clogging and requires a long time to disassemble and clean, which seriously affects production. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a waste treatment heat energy recovery device.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A waste treatment heat recovery device includes: a slurry tank and a heat exchange mechanism. The slurry tank has a slurry tank inlet and a slurry tank outlet. A stirrer is installed inside the slurry tank. The heat exchange mechanism includes a coil frame, a heat exchange coil, and a coil fixing clip. The heat exchange coil is fixedly mounted on the coil frame via the coil fixing clip. The heat exchange coil has a coil inlet and a coil outlet extending out of the slurry tank. A feed pump is connected to the coil inlet. The coil frame is fixedly installed inside the slurry tank via a detachable fixing connector.

[0006] Furthermore, the heat exchange mechanism is located below the agitator.

[0007] Furthermore, the coil rack is fixedly installed on the bottom of the slurry tank via a detachable fixing connector.

[0008] Furthermore, the heat exchange coil has an "S"-shaped reciprocating winding structure.

[0009] Furthermore, the coil rack is in multiple sets, and the heat exchange coils on the multiple sets of coil racks are connected in series.

[0010] Furthermore, the coil fixing clip is a pipe clamp.

[0011] Furthermore, the pipe clamp is a bolt with a clamp.

[0012] Furthermore, the coil frame is bolted into the slurry tank.

[0013] Furthermore, the heat exchange coil is made of 316 stainless steel.

[0014] Furthermore, the coil rack is a support frame made of multiple carbon steel profiles welded together.

[0015] The technical solution provided by this utility model has the following beneficial effects: 1. This utility model provides a heat exchange mechanism in the slurry tank. The organic slurry flows and mixes in the tank under the action of the agitator, and directly contacts the coil of the heat recovery device for heat exchange, resulting in high heat exchange efficiency of waste organic matter.

[0016] 2. A feed pump is connected to the inlet of the heat exchange coil. When the heat exchange coil becomes blocked, the connection between the coil outlet and the external device can be disconnected, and then the blockage in the heat exchange coil can be flushed out by the feed pump.

[0017] 3. The heat exchange coil of this utility model is fixedly assembled on the coil rack by the coil fixing clip. The coil rack is fixedly installed in the slurry tank by the detachable fixing connector. When maintenance or cleaning is required, the entire heat exchange mechanism can be easily disassembled by removing the fixing connector of the coil rack; thus achieving quick disassembly, maintenance or cleaning. Attached Figure Description

[0018] Figure 1 The figure shown is a side view of the waste treatment heat recovery device in the embodiment. Figure 2 The diagram shown is a top view of the waste treatment heat recovery device in the embodiment. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0020] In the description of this utility model, terms such as "upper", "lower", "left", "right", "front", and "rear" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, 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 utility model.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0022] Reference Figure 1 and Figure 2 As shown in the figure, this embodiment provides a waste treatment heat energy recovery device, including a slurry tank 1 and a heat exchange mechanism 2. The slurry tank 1 can be a cylindrical tank, a cuboid water tank, or other irregular tank; the slurry tank 1 has a slurry tank inlet 12 and a slurry tank outlet 11; specifically, the slurry tank inlet 12 is located at the upper end of the slurry tank 1, and the slurry tank outlet 11 is located at the lower end of the slurry tank 1; the slurry tank inlet 12 and the slurry tank outlet 11 can be installed on the slurry tank 1 by means of flange connection or clamp connection, etc. A stirrer 3 is provided inside the slurry tank 1, specifically, the stirrer 3 is a top-mounted stirrer, that is, it is inserted into the slurry tank 1 through the top opening of the slurry tank 1.

[0023] The heat exchange mechanism 2 includes a coil frame 23, a heat exchange coil 22, and a coil fixing clip 21. The heat exchange coil 22 is fixedly assembled on the coil frame 23 by the coil fixing clip 21. The heat exchange coil 22 has a coil inlet 24 and a coil outlet 25 extending out of the slurry tank 1. Specifically, the coil inlet 24 and the coil outlet 25 extend from the top opening of the slurry tank 1. The coil inlet 24 is connected to a feed pump. The coil frame 23 is fixedly installed in the slurry tank 1 by a detachable fixing connector.

[0024] During assembly, the heat exchange coil 22 can be pre-fixed to the coil frame 23 during factory or construction site fabrication. This is achieved by using coil fixing clips 21 to secure the heat exchange coil 22 to the coil frame 23, forming a unified heat exchange mechanism 2, which facilitates assembly. The entire structure of the heat exchange mechanism 2 is then transferred to the slurry tank 1 and fixedly installed within the slurry tank 1 using detachable fixing connectors, thus realizing the installation of this waste treatment heat recovery device. Simultaneously, the coil inlet 24 is connected to a feed pump, which in turn connects to an external hot liquid device; the coil outlet 25 is connected to an external downstream processing device (such as an anaerobic fermentation device).

[0025] During operation, organic slurry from kitchen waste and food scraps, produced through mechanical crushing or hydraulic pulping, enters slurry tank 1 through inlet 12. The organic hot liquid requiring heat exchange is pumped into heat exchange coil 22 via a feed pump. Within slurry tank 1, the organic slurry flows and mixes under the agitation of stirrer 3, directly contacting the heat exchange coil 22 for heat exchange. Since the organic slurry is at a low temperature and the organic hot liquid is at a high temperature, the direct contact between the organic slurry and the heat exchange coil 22 results in the organic hot liquid reaching coil outlet 25 having a temperature close to that of the organic slurry in slurry tank 1. The temperature of the organic slurry in slurry tank 1 then significantly increases, and the temperature at coil outlet 25 is significantly lower than that at coil inlet 24. This completes the entire process of recovering heat energy from the waste slurry; the organic heat exchange efficiency is high.

[0026] Moreover, the structure is relatively simple, which can effectively reduce the probability of blockage. Even if blockage occurs, the blockage in the heat exchange coil 22 can be resolved by disconnecting the connection between the coil outlet 25 and the external device, and then flushing out the blockage in the heat exchange coil 22 through the feed pump.

[0027] Furthermore, even if the blockage in the heat exchange coil 22 cannot be resolved by the aforementioned feed pump, the entire heat exchange mechanism can be disassembled by removing the fixing connector of the coil support; thus, rapid disassembly, maintenance, or cleaning can be achieved.

[0028] The heat exchange mechanism 2 is located below the agitator 3. This positional design allows the agitator 3 to fully agitate the slurry during operation, promoting heat exchange between the slurry and the heat exchange coil 22 and improving heat recovery efficiency. Simultaneously, the agitator 3's position above prevents solid substances in the slurry from depositing on the surface of the heat exchange coil 22, reducing the risk of decreased heat exchange efficiency.

[0029] The coil rack 23 is fixedly installed on the bottom of the slurry tank 1 by a detachable fixing connector. This installation method allows the heat exchange mechanism 2 to be firmly fixed in the slurry tank 1, and at the same time, the entire heat exchange mechanism 2 can be easily disassembled when maintenance or cleaning is required.

[0030] The heat exchange coil 22 has an "S"-shaped reciprocating winding structure. As in this embodiment, the heat exchange coil 22 forms a multi-layer structure through "S"-shaped reciprocating winding in the vertical direction, and it is also wound in an "S"-shaped reciprocating manner in the horizontal plane. This structural design increases the surface area of ​​the heat exchange coil 22, improves the heat exchange efficiency, and allows the heat exchange coil 22 to obtain the maximum heat exchange area in a limited space, making full use of the space in the slurry pool 1.

[0031] More specifically, given sufficient layout space, the bending radius of the "S" shape of the heat exchange coil 22 should be maximized to reduce friction during bends within the tube, thereby ensuring smooth material flow and preventing material buildup inside the tube, thus addressing the blockage problem of the heat exchange coil 22 at its source.

[0032] In a preferred embodiment, the coil rack 23 is in multiple groups; in this embodiment, it is in two groups. Figure 2 As shown, multiple sets of coil supports 23 are distributed on both sides of the slurry pool 1. The heat exchange coils 22 on the two sets of coil supports 23 are connected in series, specifically using flanges. The design of multiple sets of coil supports 23 allows the heat exchange coils 22 to be distributed in different areas of the slurry pool 1, increasing the contact area with the slurry and improving heat exchange efficiency. The series connection of the heat exchange coils 22 ensures a continuous flow path for the fluid within the coils, facilitating control of the fluid flow direction and velocity.

[0033] The coil fixing clip 21 is a pipe clamp. If a bolt with a clamp is used, the clamp is used to hold the heat exchange coil 22 in place, and the bolt is used to fix it to the coil rack 23. This can firmly fix the heat exchange coil 22 to the coil rack 23, preventing the heat exchange coil 22 from moving or deforming in the slurry tank 1, and ensuring the stability and reliability of the heat exchange system.

[0034] The heat exchange coil 22 is made of 316 stainless steel. 316 stainless steel has excellent corrosion resistance and can work stably for a long time in corrosive environments such as acidic, alkaline, or chloride-containing environments generated during waste treatment, thus extending the service life of the heat exchange coil 22 and reducing maintenance costs.

[0035] The coil rack 23 is a support frame formed by welding multiple carbon steel profiles. The carbon steel profiles have high strength and rigidity, capable of withstanding various mechanical loads within the slurry tank 1, ensuring the stability of the heat exchange mechanism 2. The welding connection makes the entire support frame structure robust, enabling it to operate stably in the harsh environment of the slurry tank 1 for extended periods.

[0036] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A waste treatment heat recovery device, comprising: A slurry tank and a heat exchange mechanism are provided, wherein the slurry tank has a slurry tank inlet and a slurry tank outlet; characterized in that: a stirrer is provided inside the slurry tank, and the heat exchange mechanism includes a coil frame, a heat exchange coil, and a coil fixing clip, wherein the heat exchange coil is fixedly assembled on the coil frame by the coil fixing clip, and the heat exchange coil has a coil inlet and a coil outlet extending out of the slurry tank; a feed pump is connected to the coil inlet, and the coil frame is fixedly installed inside the slurry tank by a detachable fixing connector.

2. The waste treatment heat recovery device according to claim 1, characterized in that: The heat exchange mechanism is located below the agitator.

3. The waste treatment heat recovery device according to claim 2, characterized in that: The coil frame is fixedly installed at the bottom of the slurry tank via detachable fasteners.

4. The waste treatment heat recovery device according to claim 1, characterized in that: The heat exchange coil has an "S"-shaped reciprocating winding structure.

5. The waste treatment heat recovery device according to claim 1, characterized in that: The coil rack consists of multiple sets, with heat exchange coils connected in series on each set.

6. The waste treatment heat recovery device according to claim 1, characterized in that: The coil fixing clip is a pipe clamp.

7. The waste treatment heat recovery device according to claim 6, characterized in that: The pipe clamp is a bolt with a clamp.

8. The waste treatment heat recovery device according to claim 1, characterized in that: The coil frame is bolted into the slurry tank.

9. The waste treatment heat recovery device according to claim 1, characterized in that: The heat exchange coil is made of 316 stainless steel.

10. The waste treatment heat recovery device according to claim 1, characterized in that: The coil rack is a support frame made of multiple carbon steel profiles welded together.

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