A system for reverse heating of the pretreatment process in an anaerobic fermentation device

Abstract

This invention provides a system for reverse heating of the pretreatment phase in an anaerobic fermentation apparatus, comprising a manure pretreatment unit, a primary anaerobic unit, a tertiary anaerobic unit, and a solid-liquid separation unit arranged sequentially; and a first heat recovery reverse heating unit and a second heat recovery reverse heating unit. One end of the first heat recovery reverse heating unit is connected to a boiler or generator, and the other end is connected to the primary anaerobic unit and the manure pretreatment unit, to utilize the heat from the boiler or generator for heating. One end of the second heat recovery reverse heating unit is connected to the tertiary anaerobic unit, and the other end is connected to the manure pretreatment unit, to utilize the heat from the materials in the tertiary anaerobic unit for heating. This invention utilizes the heat from the materials for reverse heating, which not only increases gas production but also raises the manure pretreatment temperature, thus better serving anaerobic fermentation.

Description

Technical Field

[0001] This utility model relates to the field of biogas slurry fermentation technology, and in particular to a system for reversing the heating of the pretreatment process in an anaerobic fermentation device. Background Technology

[0002] A persistent problem in traditional mesophilic anaerobic fermentation is the low anaerobic temperature in winter, which affects anaerobic gas production. How to extract the maximum amount of heat from the biogas slurry to raise the temperature of the pretreatment or anaerobic fermentation system is a problem to be solved. How to extract heat from the biogas slurry in a more energy-efficient, environmentally friendly, and economically viable manner is a pressing technical issue that needs to be addressed. Utility Model Content

[0003] The purpose of this invention is to provide a system for reverse heating of the pretreatment in an anaerobic fermentation device, so as to solve the above-mentioned technical problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This utility model provides a system for reverse heating of the pretreatment phase in an anaerobic fermentation device, comprising a manure pretreatment unit, a primary anaerobic unit, a tertiary anaerobic unit, and a solid-liquid separation unit arranged sequentially; and a first heat recovery reverse heating unit and a second heat recovery reverse heating unit; one end of the first heat recovery reverse heating unit is connected to a boiler or generator, and the other end is connected to the primary anaerobic unit and the manure pretreatment unit, so as to utilize the heat from the boiler or generator for heating; one end of the second heat recovery reverse heating unit is connected to the tertiary anaerobic unit, and the other end is connected to the manure pretreatment unit, so as to utilize the heat from the material in the tertiary anaerobic unit for heating.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] As a further improvement of this utility model, the first heat recovery reverse heating unit includes a first heat circulation pipe and a first heat circulation pump; wherein:

[0008] One end of the first heat circulation pipe is coiled on the outer wall of the boiler or wrapped around the outer wall of the generator, and the other end is coiled on the inner wall of the primary anaerobic unit and the inner wall of the sewage pretreatment unit.

[0009] The first heat circulation pump is mounted on the first heat circulation pipe.

[0010] As a further improvement of this utility model, the primary anaerobic unit includes an anaerobic tank No. 1 and an anaerobic tank No. 2; the first heat circulation pipe is connected to the anaerobic tank No. 1 and the anaerobic tank No. 2 in parallel.

[0011] As a further improvement of this utility model, the No. 1 anaerobic tank and the No. 2 anaerobic tank are connected to the sewage pretreatment unit pipeline in parallel.

[0012] As a further improvement of this utility model, the second heat recovery reverse heating unit includes a second heat circulation pipe and a second heat circulation pump; wherein:

[0013] One end of the second heat circulation pipe is connected to the final anaerobic unit, and the other end is coiled around the inner wall of the sewage pretreatment unit;

[0014] The second heat circulation pump is installed on the second heat circulation pipe.

[0015] As a further improvement of this utility model, the final anaerobic unit includes a third anaerobic tank, and the second heat circulation pipe is wound in a multi-layered coiled manner on the inner wall of the third anaerobic tank.

[0016] As a further improvement of this utility model, the inlet of the No. 3 anaerobic tank is connected to the discharge port pipeline of the No. 1 and No. 2 anaerobic tanks; the outlet of the No. 3 anaerobic tank is connected to the pipeline of the solid-liquid separation unit.

[0017] As a further improvement of this utility model, it also includes a temperature measurement module disposed in the primary anaerobic unit and the tertiary anaerobic unit.

[0018] As a further improvement of this utility model, the first heat circulation pipe and the second heat circulation pipe, which are coiled around the inner wall of the sewage pretreatment unit, are arranged alternately from top to bottom.

[0019] As a further improvement of this utility model, the first heat circulation pipe and the second heat circulation pipe are made of iron pipe or stainless steel pipe.

[0020] As a further improvement to this utility model,

[0021] This invention relates to an anaerobic fermentation device with a reverse heating system for pretreatment. The system comprises a manure pretreatment unit, a primary anaerobic unit, a tertiary anaerobic unit, and a solid-liquid separation unit arranged sequentially; as well as a first heat recovery reverse heating unit and a second heat recovery reverse heating unit. The first heat recovery reverse heating unit recovers heat from a boiler or generator and then transfers it to the primary anaerobic unit and the manure pretreatment unit, thereby achieving heating and insulation of these units. The tertiary anaerobic unit receives the effluent from the primary anaerobic unit. Without adding a self-heating device, and due to the short retention time within the tertiary anaerobic unit, the temperature can be appropriately lowered to reach the gas production temperature. This allows the heat from this material to be used for reverse heating of the pretreatment system. The tertiary anaerobic unit is equipped with... The system employs multi-layered coils, including one within the sewage pretreatment unit, to utilize the heat from the effluent to heat and maintain the pretreatment module. The first and second heat recovery reverse heating units are selectable. When the system is first started, the first heat recovery reverse heating unit heats and maintains the sewage pretreatment unit. Once the system is running stably and the final anaerobic unit contains effluent from the primary anaerobic unit, the first heat recovery reverse heating unit can be shut off from supplying heat to the sewage pretreatment unit, while the heat from the material is used for reverse heating. Softened water is added to the pipes of both units. This structural design not only increases gas production but also raises the sewage pretreatment temperature, better serving anaerobic fermentation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the system structure of the anaerobic fermentation device of this utility model, which reverses the heating of the pretreatment process.

[0024] In the diagram: 1. Wastewater pretreatment unit; 2. Anaerobic tank No. 1; 3. Anaerobic tank No. 2; 4. Anaerobic tank No. 3; 5. Solid-liquid separation unit; 101. First heat circulation pipe; 102. First heat circulation pump; 201. Second heat circulation pipe; 202. Second heat circulation pump; 203. Temperature measurement module. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] like Figure 1 As shown, this utility model provides a system for reverse heating of the pretreatment in an anaerobic fermentation device, including a manure pretreatment unit 1, a primary anaerobic unit, a final anaerobic unit and a solid-liquid separation unit 4 arranged in sequence; as well as a first heat recovery reverse heating unit and a second heat recovery reverse heating unit;

[0027] Among them: sewage pretreatment unit 1 is used for preliminary pretreatment of sewage, and it is a tank structure;

[0028] The primary anaerobic unit receives the effluent from the sewage pretreatment unit 1 and performs anaerobic fermentation. Since the anaerobic fermentation temperature is between 37 and 42 degrees Celsius, if the temperature is insufficient in winter, the gas production will decrease, affecting the fermentation effect. The tertiary anaerobic unit receives the effluent from the primary anaerobic unit and performs further anaerobic fermentation. The solid-liquid separation unit 4 receives the effluent from the tertiary fermentation unit after fermentation and performs further solid-liquid separation.

[0029] The first heat recovery reverse heating unit is connected at one end to a boiler or generator and at the other end to the primary anaerobic unit and the sewage pretreatment unit 1, so as to use the heat from the boiler or generator for heating.

[0030] The second heat recovery reverse heating unit is connected at one end to the final anaerobic unit and at the other end to the sewage pretreatment unit 1, so as to use the heat of the material in the final anaerobic unit for heating.

[0031] This utility model discloses an anaerobic fermentation device with a reverse heating system for pretreatment, comprising a manure pretreatment unit 1, a primary anaerobic unit, a tertiary anaerobic unit, and a solid-liquid separation unit 4 arranged sequentially; as well as a first heat recovery reverse heating unit and a second heat recovery reverse heating unit; the first heat recovery reverse heating unit recovers heat from the boiler or generator and then transmits it to the primary anaerobic unit and the manure pretreatment unit 1, thereby achieving heating and heat preservation of the manure pretreatment unit 1 and the primary anaerobic unit; the tertiary anaerobic unit receives the effluent from the primary anaerobic unit, and can appropriately lower the temperature to reach the gas production temperature without adding a self-heating device, since the retention time in the tertiary anaerobic unit is short, thus utilizing the heat of this part of the material for reverse heating of the pretreatment.

[0032] like Figure 1As shown, in this embodiment, the first heat recovery reverse heating unit includes a first heat circulation pipe 101 and a first heat circulation pump 102; wherein:

[0033] One end of the first heat circulation tube 101 is coiled on the outer wall of the boiler or wrapped around the outer wall of the generator, and the other end is coiled on the inner wall of the primary anaerobic unit and the inner wall of the sewage pretreatment unit 1.

[0034] The first heat circulation pump 102 is installed on the first heat circulation pipe 101.

[0035] It should be noted that the first heat circulation pipe 101 should be a closed circulation structure, with one end coiled on the boiler and the other end coiled on the inner wall of the primary anaerobic unit and the inner wall of the sewage pretreatment unit 1; or, one end of the first heat circulation pipe 101 is coiled on the generator and the other end is coiled on the inner wall of the primary anaerobic unit and the inner wall of the sewage pretreatment unit 1.

[0036] Of course, considering that the softened water in the first heat circulation pipe 101 may be lost due to evaporation, a water inlet can be opened on the first heat circulation pipe 101, and a switch cover can be installed at the water inlet.

[0037] In addition, since the first heat circulation pipe 101 is connected to the primary anaerobic unit and the sewage pretreatment unit 1 respectively, the first heat circulation pump 102 should be installed on the first heat circulation pipe 101 connected to the primary anaerobic unit and the sewage pretreatment unit 1 respectively, so as to control the start and stop of heating of each branch respectively.

[0038] As a further improvement of this utility model, the primary anaerobic unit includes anaerobic tank 2 and anaerobic tank 3; the first heat circulation pipe 101 is connected to anaerobic tank 2 and anaerobic tank 3 in parallel.

[0039] A first heat circulation pump 102 is installed on the first heat circulation pipe 101 connected to anaerobic tank 2 and anaerobic tank 3.

[0040] The first heat circulation pump 102 should be of adjustable speed type to adjust the softened water supply flow rate according to the temperature measured by the temperature measurement module 203 set in the primary anaerobic unit, so as to avoid excessive heating or insufficient heating.

[0041] As a further improvement of this utility model, the No. 1 anaerobic tank 2 and the No. 2 anaerobic tank 3 are connected in parallel to the pipeline of the sewage pretreatment unit 1, thereby enabling the two anaerobic tanks to receive the discharge of the sewage pretreatment unit 1.

[0042] like Figure 1 As shown, in this embodiment, the second heat recovery reverse heating unit includes a second heat circulation pipe 201 and a second heat circulation pump 202; wherein:

[0043] One end of the second heat circulation pipe 201 is connected to the final anaerobic unit, and the other end is coiled on the inner wall of the sewage pretreatment unit 1.

[0044] The second heat circulation pump 202 is installed on the second heat circulation pipe 201.

[0045] The second heat recovery reverse heating unit is used to supply the heat of the material in the No. 3 anaerobic tank 4 to the sewage pretreatment unit 1. The material in the No. 3 anaerobic tank 4 only exists after the material in the No. 1 and No. 2 anaerobic tanks is discharged. Therefore, the second heat recovery reverse heating unit is not started at the beginning. Instead, the first heat recovery reverse heating unit is used for heating. The second heat recovery reverse heating unit is started only after there is material in the No. 3 anaerobic tank 4. The first heat recovery reverse heating unit is then turned off to supply heat to the sewage pretreatment unit 1. Only the first heat recovery reverse heating unit is kept on to increase the temperature of the primary anaerobic unit.

[0046] As a further improvement of this utility model, the final anaerobic unit includes a third anaerobic tank 4, and the second heat circulation pipe 201 is wound in a multi-layered coiled manner on the inner wall of the third anaerobic tank 4.

[0047] Furthermore, in this invention, the heat circulation pipes are all wound in multiple layers inside the sewage pretreatment unit 1, anaerobic tank 2, anaerobic tank 3, and anaerobic tank 4, and are all wound around the inner wall of the tanks.

[0048] As a further improvement of this utility model, the inlet of the No. 3 anaerobic tank 4 is connected to the discharge port pipeline of the No. 1 anaerobic tank 2 and the No. 2 anaerobic tank 3; the outlet of the No. 3 anaerobic tank 4 is connected to the pipeline of the solid-liquid separation unit 4.

[0049] As a further improvement of this utility model, it also includes a temperature measurement module 203 disposed in the primary anaerobic unit and the tertiary anaerobic unit.

[0050] The temperature measurement module 203 can be set in the middle or lower part of the tank. Since the primary anaerobic unit discharges material to the top of the final anaerobic unit, and the sewage pretreatment unit 1 discharges material to the top of the primary anaerobic unit, setting the temperature measurement module 203 in the middle or lower part can ensure the supply of excess heat for both primary and final anaerobic fermentation.

[0051] As a further improvement of this utility model, the first heat circulation pipe 101 and the second heat circulation pipe 201, which are coiled on the inner wall of the sewage pretreatment unit 1, are arranged alternately from top to bottom.

[0052] This structural design ensures that the overall heating effect of the sewage pretreatment unit is maintained even when any circulation pipe is closed.

[0053] As a further improvement of this utility model, the first heat circulation pipe 101 and the second heat circulation pipe 201 are made of iron pipe or stainless steel pipe.

[0054] This utility model discloses an anaerobic fermentation device with a reverse heating system for pretreatment. It includes a manure pretreatment unit 1, a primary anaerobic unit, a tertiary anaerobic unit, and a solid-liquid separation unit 4 arranged sequentially; as well as a first heat recovery reverse heating unit and a second heat recovery reverse heating unit. The first heat recovery reverse heating unit recovers heat from a boiler or generator and then transfers it to the primary anaerobic unit and the manure pretreatment unit 1, thereby achieving heating and insulation of these units. The tertiary anaerobic unit receives the effluent from the primary anaerobic unit. Without adding a self-heating device, and due to the short retention time within the tertiary anaerobic unit, the temperature can be appropriately lowered to reach the gas production temperature. Therefore, the heat from this portion of the material can be used for reverse heating of the pretreatment system. The tertiary anaerobic unit is equipped with... A multi-layer coil system is installed, with another coil system installed within the sewage pretreatment unit 1. This utilizes the heat from the effluent to heat and maintain the pretreatment module. The first and second heat recovery reverse heating units can be selected independently. When the system is first started, the first heat recovery reverse heating unit can be used to heat and maintain the sewage pretreatment unit 1. Once the system is running stably and the final anaerobic unit contains effluent from the primary anaerobic unit, the first heat recovery reverse heating unit can be shut off from supplying heat to the sewage pretreatment unit, and the heat from the material can be used for reverse heating. Softened water can be added to the pipes of both the first and second heat recovery reverse heating units. This structural design not only increases gas production but also raises the sewage pretreatment temperature, better serving anaerobic fermentation.

[0055] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0056] 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," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are 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.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A system for reverse-feeding pretreatment heating in an anaerobic fermentation apparatus, characterized in that, The system includes a wastewater pretreatment unit, a primary anaerobic unit, a tertiary anaerobic unit, and a solid-liquid separation unit arranged sequentially; as well as a first heat recovery reverse heating unit and a second heat recovery reverse heating unit; one end of the first heat recovery reverse heating unit is connected to a boiler or generator, and the other end is connected to the primary anaerobic unit and the wastewater pretreatment unit, so as to use the heat from the boiler or generator for heating; one end of the second heat recovery reverse heating unit is connected to the tertiary anaerobic unit, and the other end is connected to the wastewater pretreatment unit, so as to use the heat from the material in the tertiary anaerobic unit for heating.

2. The system for reverse-feeding pretreatment heating in the anaerobic fermentation apparatus according to claim 1, characterized in that, The first heat recovery reverse heating unit includes a first heat circulation pipe and a first heat circulation pump; wherein: One end of the first heat circulation pipe is coiled on the outer wall of the boiler or wrapped around the outer wall of the generator, and the other end is coiled on the inner wall of the primary anaerobic unit and the inner wall of the sewage pretreatment unit. The first heat circulation pump is mounted on the first heat circulation pipe.

3. The system for reverse pre-treatment thermophily of an anaerobic fermentation device according to claim 2, characterized in that, The primary anaerobic unit includes anaerobic tank No. 1 and anaerobic tank No. 2; the first heat circulation pipe is connected to anaerobic tank No. 1 and anaerobic tank No. 2 in parallel.

4. The system for reverse pre-treatment thermophily of an anaerobic fermentation device according to claim 3, characterized in that, The No. 1 anaerobic tank and the No. 2 anaerobic tank are connected in parallel to the sewage pretreatment unit pipeline.

5. The system for reverse-feeding pretreatment heating in the anaerobic fermentation apparatus according to claim 3, characterized in that, The second heat recovery reverse heating unit includes a second heat circulation pipe and a second heat circulation pump; wherein: One end of the second heat circulation pipe is connected to the final anaerobic unit, and the other end is coiled around the inner wall of the sewage pretreatment unit; The second heat circulation pump is installed on the second heat circulation pipe.

6. The system for reverse-feeding pretreatment heating in the anaerobic fermentation apparatus according to claim 5, characterized in that, The final anaerobic unit includes a No. 3 anaerobic tank, and the second heat circulation pipe is wound in a multi-layered coiled manner on the inner wall of the No. 3 anaerobic tank.

7. The system for reverse-feeding pretreatment heating in the anaerobic fermentation apparatus according to claim 6, characterized in that, The inlet of the No. 3 anaerobic tank is connected to the discharge outlet pipelines of the No. 1 and No. 2 anaerobic tanks; the outlet of the No. 3 anaerobic tank is connected to the pipeline of the solid-liquid separation unit.

8. The system for reverse-feeding pretreatment heating in the anaerobic fermentation apparatus according to claim 5, characterized in that, It also includes a temperature measurement module installed in the primary anaerobic unit and the tertiary anaerobic unit.

9. The system for reverse-feeding pretreatment heating in the anaerobic fermentation apparatus according to claim 5, characterized in that, The first and second heat circulation pipes, which are coiled around the inner wall of the sewage pretreatment unit, are arranged alternately from top to bottom.

10. The system for reverse-feeding pretreatment heating in the anaerobic fermentation apparatus according to claim 5, characterized in that, The first heat circulation pipe and the second heat circulation pipe are made of iron pipe or stainless steel pipe.

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