CN216192233U - Biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system - Google Patents
Biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system Download PDFInfo
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- CN216192233U CN216192233U CN202122650496.5U CN202122650496U CN216192233U CN 216192233 U CN216192233 U CN 216192233U CN 202122650496 U CN202122650496 U CN 202122650496U CN 216192233 U CN216192233 U CN 216192233U
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Abstract
The utility model discloses a biogas slurry heat recovery and anaerobic fermentation tank external heat exchange and temperature increasing system, which comprises: raw materials feeding pond, raw materials suction pump, anaerobic fermentation jar, natural pond liquid charge pump, natural pond liquid heat recovery heat exchanger, natural pond liquid collecting tank, material circulating pump, material heat exchanger, normal atmospheric temperature water storage tank, cold water circulating pump, outer firing equipment, first hot water circulating pump. Wherein, anaerobic fermentation jar and the exit linkage of raw materials suction pump, anaerobic fermentation jar pass through the natural pond liquid discharge pump and are connected with natural pond liquid heat recovery heat exchanger, and normal atmospheric temperature water storage tank passes through cold water circulating pump and is connected with natural pond liquid heat recovery heat exchanger, and anaerobic fermentation jar passes through the material circulating pump and is connected with material heat exchanger, and material heat exchanger is connected with outer firing equipment. The biogas slurry waste heat in the system is fully utilized, the loss of heat discharged outside the biogas slurry is avoided, and the tank body external heating mode is adopted, so that the maintenance of the later-stage system is facilitated under the condition of increasing the heat exchange efficiency of the system.
Description
Technical Field
The utility model relates to the technical field of biogas engineering, in particular to a biogas slurry heat recovery and anaerobic fermentation tank external heat exchange and temperature increasing system.
Background
The biogas engineering takes organic wastes such as crop straws, human and animal wastes, waste fruits and vegetables, kitchen wastes, agricultural product processing byproducts and the like as raw materials, generates biogas through anaerobic fermentation, further produces the biogas into green electric power or biogas engineering according to market conditions, and can realize harmless treatment and resource utilization of the organic wastes in urban and rural areas. The biogas and the biological natural gas are used for replacing fossil energy such as coal, liquefied petroleum gas and conventional natural gas, and the method is an important measure for reducing the carbon emission intensity and realizing carbon neutralization. The biogas engineering is in a pivotal position in the agricultural recycling economy, develops rural biogas, is beneficial to cultivating and developing new renewable energy industry and energy utilization industry, is beneficial to breaking the environment-friendly restriction of livestock and poultry breeding, reducing epidemic disease risk, promoting the development of breeding industry, promoting the development of organic fertilizer industry and planting combined ecological recycling agriculture, and is beneficial to promoting the development of modern environment-friendly industry based on the resource utilization of organic wastes in cities and countryside.
The anaerobic fermentation technology is the core technology of biogas engineering, and in order to achieve stable gas production effect, the biogas engineering usually adopts a medium-high temperature fermentation mode. Usually need the external heating source, like biogas boiler, modes such as cogeneration exhaust-heat boiler heat-exchanger heat are heated for the system, and whatever kind of external heating source, all can increase the running cost of marsh gas engineering, and on the other hand, the natural pond liquid that produces after the medium-high temperature anaerobic fermentation will be discharged the natural pond liquid pond and keep temporarily for use according to process flow, and the heat that natural pond liquid carried will also scatter and disappear in the environment, is a very big waste of heat. Meanwhile, in the heating process of the anaerobic fermentation tank, the heating mode frequently adopted is heating of the inner coil pipe of the anaerobic fermentation tank and the outer coil pipe of the anaerobic fermentation tank, the outer coil pipe achieves the mode of material heating through heating of the wall of the fermentation tank, the heat transfer efficiency is low, the relative heat exchange efficiency of the heating of the inner coil pipe is high, but along with the lapse of the running time, the materials on the outer wall of the coil pipe are attached to and stacked, the materials are not easy to clean, and the heat exchange effect is seriously influenced.
Therefore, how to provide a biogas slurry heat recovery and anaerobic fermentation tank external heat exchange temperature increasing system which can improve the temperature increasing effect of the anaerobic fermentation part, ensure the operation temperature of the anaerobic fermentation part and utilize heat with the highest efficiency so as to ensure that the biogas engineering is efficient, stable and low-cost.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system which can improve warming effect on an anaerobic fermentation part, guarantee operation temperature of the anaerobic fermentation part, and utilize heat with the highest efficiency, so that biogas engineering is efficient, stable and low-cost in operation.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system comprises:
the raw material feeding tank is internally provided with a raw material suction pump;
the raw material inlet of the anaerobic fermentation tank is communicated with the outlet of the raw material suction pump through a raw material input pipe, the biogas slurry outlet of the anaerobic fermentation tank is communicated with the inlet of a biogas slurry discharge pump through a first biogas slurry conveying pipe, the outlet of the biogas slurry discharge pump is connected with the heat exchange inlet of the biogas slurry heat recovery heat exchanger through a second biogas slurry conveying pipe, a heat exchange outlet of the biogas slurry heat recovery heat exchanger is connected with a biogas slurry collecting tank, a material circulation outlet of the anaerobic fermentation tank is connected with an inlet of a material circulation pump through a first material circulation outlet pipe, the outlet of the material circulating pump is connected with the heat exchange inlet of the material heat exchanger through a second material circulating outlet pipe, a heat exchange outlet of the material heat exchanger is connected with a material circulation inlet of the anaerobic fermentation tank through a material circulation inlet pipe, and a first temperature sensor for monitoring the temperature of the material is arranged on the anaerobic fermentation tank;
a cold water outlet of the normal-temperature water storage tank is connected with a cold water inlet of the biogas slurry heat recovery heat exchanger through a cold water circulating pump, and a hot water outlet of the biogas slurry heat recovery heat exchanger is connected with first heat equipment;
and a hot water outlet of the external heating equipment is connected with a hot water inlet of the material heat exchanger through a first hot water circulating pump, and a hot water outlet of the material heat exchanger is connected with a second heating equipment.
Through the technical scheme, compared with the prior art, the utility model discloses a biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system, the heating of the materials in the anaerobic fermentation tank in the system adopts a material tank external heat exchange mode, namely, the material circulating pump works to pump the material in the anaerobic fermentation tank into the material heat exchanger, the heat exchange is carried out in the material heat exchanger through the hot water provided by the external heating equipment, after the heat exchange, the material is heated, the heated material enters the anaerobic fermentation tank through the material circulating inlet pipe for fermentation, the system can detect the temperature of material fermentation in real time according to the first temperature sensor, control the start and stop of the material circulating pump, the hot backwater after heat exchange of the material heat exchanger can be used for second thermal equipment, so that the heat of the hot backwater is fully utilized, and the waste of the heat of the hot backwater after heat exchange of the material heat exchanger is avoided. Therefore, the utility model adopts the external heating mode of the tank body, is convenient for the maintenance of the system in the later period under the condition of increasing the heat exchange efficiency of the system, and simultaneously plays a certain role of stirring in the anaerobic fermentation tank during the circulation process of the materials, thereby effectively avoiding the problem of material accumulation around the tank body. Meanwhile, heat exchange is carried out between the biogas slurry in the anaerobic fermentation tank and water in the normal-temperature water storage tank through the biogas slurry heat recovery heat exchanger, and hot return water after heat exchange can be used for first heat equipment, so that the waste heat of the biogas slurry is fully utilized, the heat loss of the biogas slurry discharged outside is avoided, the heat exchange capacity of the system is improved, and the operation cost of the system is reduced.
Furthermore, the first heat equipment is the raw material feeding pool, the raw material feeding pool is provided with an inner heating coil and a second temperature sensor, a hot water outlet of the biogas slurry heat recovery heat exchanger is connected with a water inlet of the inner heating coil, and a water outlet of the inner heating coil is connected with a cold water outlet of the normal-temperature water storage tank.
The beneficial effect who adopts above-mentioned technical scheme to produce is, be connected the hot water export of natural pond liquid heat recovery heat exchanger with the water inlet of interior heating coil, the raw materials of heating coil in to the raw materials feed pond in being convenient for preheats, so not only makes the natural pond liquid waste heat obtain make full use of, and the raw materials pump after preheating sends back in to anaerobic fermentation jar in addition, can shorten anaerobic fermentation jar's the outer heat transfer time of jar for anaerobic fermentation jar reaches the required temperature of fermentation fast, has improved the speed of fermentation greatly.
Furthermore, the second heat equipment is a medium-temperature water storage tank, a hot water outlet of the medium-temperature water storage tank is connected with a water inlet of the inner heating coil through a second hot water circulating pump, and a hot water outlet of the material heat exchanger is connected with a water inlet of the medium-temperature water storage tank.
The beneficial effect who adopts above-mentioned technical scheme to produce is, when second temperature sensor detects that the temperature in the raw materials feeding pond is less than the setting value, when the hot return water of natural pond liquid heat recovery heat exchanger is not enough to heat the raw materials in the raw materials feeding pond promptly, hot water suction to interior heating coil in second hot water circulating pump in with the medium temperature water storage tank makes interior heating coil can heat the raw materials in the raw materials feeding pond to predetermineeing the temperature, and heating coil can normal use in keeping. And the hot water outlet of the material heat exchanger is connected with the water inlet of the medium temperature water storage tank, so that water and water temperature in the medium temperature water storage tank are effectively supplemented.
Furthermore, the water storage tank for the high-temperature water is further included, a water inlet of the high-temperature water storage tank is connected with a hot water outlet of the external heating equipment, a hot water outlet of the high-temperature water storage tank is connected with a water inlet of the medium-temperature water storage tank through a third hot water circulating pump, and a third temperature sensor used for monitoring the water temperature is arranged on the medium-temperature water storage tank.
Adopt the beneficial effect that above-mentioned technical scheme produced to be, when third temperature sensor detects that the temperature of water in the well warm water storage tank is less than its setting value, third hot-water circulating pump pumps the hot water of high temperature water storage tank to well warm water storage tank for well warm water storage tank can keep normal water temperature requirement.
Furthermore, a water outlet of the medium temperature water storage tank is connected with a water inlet of the external heating equipment through a water discharge pipe.
Adopt the beneficial effect that above-mentioned technical scheme produced to be, discharge the water of well warm water storage tank into external heating equipment and heat the reuse again for the water source in the system can recycle, avoids the waste of water resource.
Furthermore, a fourth temperature sensor for monitoring the water temperature is arranged on the high-temperature water storage tank.
The beneficial effect who adopts above-mentioned technical scheme to produce is, the temperature monitoring in the high temperature water storage tank of being convenient for.
Furthermore, a fifth temperature sensor for monitoring the water temperature is arranged in the normal-temperature water storage tank.
The beneficial effect who adopts above-mentioned technical scheme to produce is, the temperature monitoring in the normal atmospheric temperature water storage tank of being convenient for.
Furthermore, a material stirrer is arranged in the anaerobic fermentation tank.
The beneficial effect who adopts above-mentioned technical scheme to produce is that, during the fermentation, the material agitator stirs the material, can accelerate the fermentation speed of material to effectively avoid jar body material all around to pile up serious problem.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a biogas slurry heat recovery and anaerobic fermentation tank external heat exchange and temperature increase system provided by the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the embodiment of the utility model discloses a biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system, comprising:
a raw material suction pump 2 is arranged in the raw material feeding tank 1;
an anaerobic fermentation tank 3, wherein a raw material inlet of the anaerobic fermentation tank 3 is communicated with an outlet of a raw material suction pump 2 through a raw material input pipe 4, a biogas slurry outlet of the anaerobic fermentation tank 3 is communicated with an inlet of a biogas slurry discharge pump 6 through a first biogas slurry conveying pipe 5, an outlet of the biogas slurry discharge pump 6 is connected with a heat exchange inlet of a biogas slurry heat recovery heat exchanger 8 through a second biogas slurry conveying pipe 7, a heat exchange outlet of the biogas slurry heat recovery heat exchanger 8 is connected with a biogas slurry collecting tank 9, a material circulation outlet of the anaerobic fermentation tank 3 is connected with an inlet of a material circulation pump 11 through a first material circulation outlet pipe 10, an outlet of the material circulation pump 11 is connected with a heat exchange inlet of a material heat exchanger 13 through a second material circulation outlet pipe 12, a heat exchange outlet of the material heat exchanger 13 is connected with a material circulation inlet of the anaerobic fermentation tank 3 through a material circulation inlet pipe 14, and the anaerobic fermentation tank 3 is provided with a first temperature sensor 15 for monitoring material temperature;
a cold water outlet of the normal temperature water storage tank 16 is connected with a cold water inlet of the biogas slurry heat recovery heat exchanger 8 through a cold water circulating pump 17, and a hot water outlet of the biogas slurry heat recovery heat exchanger 8 is connected with first heat equipment;
the hot water outlet of the external heating equipment 18 is connected with the hot water inlet of the material heat exchanger 13 through a first hot water circulating pump 19, and the hot water outlet of the material heat exchanger 13 is connected with the second hot equipment.
The first heat equipment is a raw material feeding pool 1, an inner heating coil 20 and a second temperature sensor 21 are arranged on the raw material feeding pool 1, a hot water outlet of the biogas slurry heat recovery heat exchanger 8 is connected with a water inlet of the inner heating coil 20, and a water outlet of the inner heating coil 20 is connected with a cold water outlet of the normal temperature water storage tank 16.
The second heat equipment is a medium temperature water storage tank 22, a hot water outlet of the medium temperature water storage tank 22 is connected with a water inlet of the inner heating coil 20 through a second hot water circulating pump 23, and a hot water outlet of the material heat exchanger 13 is connected with a water inlet of the medium temperature water storage tank 22.
The utility model provides a natural pond liquid heat recovery and anaerobic fermentation jar outer heat transfer system that heats, still includes high temperature water storage tank 24, the water inlet of high temperature water storage tank 24 and the hot water exit linkage of outer firing equipment 18, the hot water export of high temperature water storage tank 24 is connected with the water inlet of well warm water storage tank 22 through third hot water circulating pump 25, is equipped with the third temperature sensor 26 that is used for monitoring the temperature on well warm water storage tank 22.
The water outlet of the medium temperature water storage tank 22 is connected with the water inlet of the external heating device 18 through a water outlet pipe 27.
The high temperature water storage tank 24 is provided with a fourth temperature sensor 28 for monitoring the water temperature.
A fifth temperature sensor 29 for monitoring the water temperature is arranged in the normal temperature water storage tank 16.
A material stirrer 30 is arranged in the anaerobic fermentation tank 3.
The system during operation, the mode of material jar outer heat transfer is taken in the heating of material in the anaerobic fermentation jar, material circulating pump work promptly, with the material suction in the anaerobic fermentation jar to the material heat exchanger, the hot water that provides through outer heating equipment carries out the heat transfer exchange in the material heat exchanger, after the heat transfer exchange, the material is heated, the material rethread material circulation after the heating advances the pipe and gets into the anaerobic fermentation jar in the fermentation, and can be according to the temperature of a temperature sensor real-time detection material fermentation, the system control material circulating pump open and stop work, and the hot return water after the material heat exchanger heat transfer can return for the well warm water storage tank, make the heat of hot return water fully obtain utilizing, avoid the thermal waste of hot return water after the material heat exchanger heat transfer. Simultaneously, anaerobic fermentation tank's natural pond liquid carries out the heat transfer through the water in natural pond liquid heat recovery heat exchanger and the normal atmospheric temperature water storage tank, the hot return water after the heat transfer can be used for interior heating coil, preheat the raw materials in the raw materials feed pond, so not only make the natural pond liquid waste heat obtain make full use of, and the raw materials pump sending after preheating is back in to anaerobic fermentation tank, can shorten anaerobic fermentation tank's the outer heat transfer time of jar, make anaerobic fermentation tank reach the required temperature of fermentation fast, the speed of fermentation has been improved greatly, avoid the outer heat loss of arranging of natural pond liquid, the heat exchange capacity of improvement system, thereby the running cost of lowering system.
The advantages of the system are as follows:
(1) the biogas slurry waste heat can be used by the inner heating coil, so that the biogas slurry waste heat is fully utilized, the heat loss of the biogas slurry discharged outside is avoided, the heat exchange capacity of the system is improved, and the operation cost of the system is reduced.
(2) The external heating mode of the tank is adopted, so that the maintenance of the later-stage system is facilitated under the condition of increasing the heat exchange efficiency of the system, and meanwhile, the materials play a certain stirring role in the circulating process, so that the problem of material accumulation on the inner wall surface of the anaerobic fermentation tank body can be effectively avoided.
(3) The design of a normal-temperature water storage tank, a medium-temperature water storage tank and a high-temperature water storage tank, namely a sectional type temperature storage tank, is adopted for hot return water in the system, so that the heat exchange efficiency is increased, the temperature of system operation is ensured, water in the system is recycled, the waste of water resources is effectively avoided, and the water resources are saved.
Therefore, the system can improve the warming effect of the anaerobic fermentation part, ensure the operation temperature of the anaerobic fermentation part, utilize heat with the highest efficiency, and enable the biogas engineering to operate with high efficiency, stability and low cost.
The following is an example of a project embodiment of a specific application of the system: the normal temperature water storage tank (the first water storage tank) in the utility model can be a 20 ℃ water storage tank, the medium temperature water storage tank (the second water storage tank) can be a 40 ℃ water storage tank, the high temperature water storage tank (the third water storage tank) can be a 90 ℃ water storage tank, the external heating equipment can be a hot water boiler in biogas engineering or a waste heat boiler in cogeneration, and the temperature of the generated hot water is 90 ℃.
The project is positioned on the right front flag of the Xingguan union department in inner Mongolia city, the biogas engineering raw material is pig manure, the volume of a single anaerobic fermentation tank is 5000 cubic meters, the anaerobic fermentation of the project adopts a medium-temperature fermentation mode, the operation temperature of the anaerobic fermentation is 38 ℃, the biogas slurry is provided with a waste heat recovery system, in the biogas slurry waste heat recovery system, the inlet temperature of the biogas slurry is 38 ℃, the outlet temperature of the biogas slurry is 25 ℃, the water inlet temperature of a biogas slurry heat recovery heat exchanger is 20 ℃, the outlet temperature of the biogas slurry heat recovery heat exchanger is 35 ℃, hot water after heat exchange heats materials in a raw material feeding pool, and the raw materials are heated to 18-20 ℃. Anaerobic fermentation jar heats and adopts the heat transfer mode outside the jar, and the material passes through in material circulating pump carries the material heat exchanger to accomplish the heat transfer with 90 ℃ hot water, control opening of the outer material circulating pump of jar through the first temperature sensor in the anaerobic fermentation jar and stop, when the temperature is less than 38 ℃, the material circulating pump is opened, starts the heat transfer outside the jar, when reaching 38 ℃, the shutdown. And when the temperature in the raw material feeding pool is lower than 18-20 ℃, namely the heat recovered from the biogas slurry is not enough to heat, the hot water in the 40 ℃ water storage tank is used for supplementing the internal heating coil, and when the temperature in the 40 ℃ water storage tank is lower, the hot water can be pumped from the 90 ℃ water storage tank to the 40 ℃ water storage tank. The heat quantity recovered by biogas slurry every day in the project is equivalent to 1500m3Heat provided by biogas combustion.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides a natural pond liquid heat recovery and anaerobic fermentation jar outer heat transfer system that heats which characterized in that includes:
the device comprises a raw material feeding pool (1), wherein a raw material suction pump (2) is arranged in the raw material feeding pool (1);
anaerobic fermentation tank (3), the raw materials import of anaerobic fermentation tank (3) pass through raw materials input tube (4) with the export intercommunication of raw materials suction pump (2), the natural pond liquid export of anaerobic fermentation tank (3) is through the import intercommunication of first natural pond liquid conveyer pipe (5) with natural pond liquid discharge pump (6), the export of natural pond liquid discharge pump (6) passes through the heat transfer access connection of second natural pond liquid conveyer pipe (7) with natural pond liquid heat recovery heat exchanger (8), the heat transfer exit linkage of natural pond liquid heat recovery heat exchanger (8) has natural pond liquid collecting pit (9), the material circulation export of anaerobic fermentation tank (3) passes through the access connection of first material circulation exit tube (10) with material circulating pump (11), the export of material circulating pump (11) passes through the heat transfer access connection of second material circulation exit tube (12) with material heat exchanger (13), the heat transfer export of material heat exchanger (13) pass through material circulation entry tube (14) with anaerobic fermentation tank (2) A material circulation inlet of the tank (3) is connected, and a first temperature sensor (15) for monitoring the temperature of the material is arranged on the anaerobic fermentation tank (3);
a cold water outlet of the normal temperature water storage tank (16) is connected with a cold water inlet of the biogas slurry heat recovery heat exchanger (8) through a cold water circulating pump (17), and a hot water outlet of the biogas slurry heat recovery heat exchanger (8) is connected with first heat equipment;
the hot water outlet of the external heating equipment (18) is connected with the hot water inlet of the material heat exchanger (13) through a first hot water circulating pump (19), and the hot water outlet of the material heat exchanger (13) is connected with second hot equipment.
2. The biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system according to claim 1, wherein the first heat utilization equipment is the raw material feeding tank (1), an inner heating coil (20) and a second temperature sensor (21) are arranged on the raw material feeding tank (1), a hot water outlet of the biogas slurry heat recovery heat exchanger (8) is connected with a water inlet of the inner heating coil (20), and a water outlet of the inner heating coil (20) is connected with a cold water outlet of the normal temperature water storage tank (16).
3. The biogas slurry heat recovery and anaerobic fermentation tank external heat exchange and warming system according to claim 2, wherein the second heat equipment is a medium temperature water storage tank (22), a hot water outlet of the medium temperature water storage tank (22) is connected with a water inlet of the inner heating coil (20) through a second hot water circulating pump (23), and a hot water outlet of the material heat exchanger (13) is connected with a water inlet of the medium temperature water storage tank (22).
4. The biogas slurry heat recovery and anaerobic fermentation tank external heat exchange and warming system according to claim 3, further comprising a high temperature water storage tank (24), wherein a water inlet of the high temperature water storage tank (24) is connected with a hot water outlet of the external heating device (18), a hot water outlet of the high temperature water storage tank (24) is connected with a water inlet of the medium temperature water storage tank (22) through a third hot water circulating pump (25), and a third temperature sensor (26) for monitoring water temperature is arranged on the medium temperature water storage tank (22).
5. The biogas slurry heat recovery and anaerobic fermentation tank external heat exchange and warming system as claimed in claim 4, wherein the water outlet of the medium temperature water storage tank (22) is connected with the water inlet of the external heating device (18) through a water outlet pipe (27).
6. The biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system according to claim 4, wherein a fourth temperature sensor (28) for monitoring water temperature is arranged on the high-temperature water storage tank (24).
7. The biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system according to claim 1, wherein a fifth temperature sensor (29) for monitoring water temperature is arranged in the normal temperature water storage tank (16).
8. The biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system according to any one of claims 1 to 7, wherein a material stirrer (30) is arranged in the anaerobic fermentation tank (3).
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| CN202122650496.5U CN216192233U (en) | 2021-11-01 | 2021-11-01 | Biogas slurry heat recovery and anaerobic fermentation tank external heat exchange warming system |
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