CN114891605A - High-temperature anaerobic digestion system and control method thereof - Google Patents
High-temperature anaerobic digestion system and control method thereof Download PDFInfo
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Abstract
The application discloses a high-temperature anaerobic digestion system and a control method thereof, relating to production equipment, wherein the system comprises: a storage room; a heat storage tank; the pretreatment tank is used for pretreating the raw materials; the hydrolysis acidification tank is used for acidifying the pretreated feed liquid to obtain acid liquid; an anaerobic digestion tank for subjecting the acid liquor to anaerobic digestion to produce biogas; the biogas liquid pool is used for storing feed liquid discharged by the anaerobic digestion tank, wherein the biogas liquid flows back to the pretreatment pool; the gas storage tank is used for generating biogas by the anaerobic digestion tank; the screw pump is used for conveying liquid materials; the heat storage tank is used for storing hot water in the hot water storage tank; the sensor system is used for acquiring sensing signals; and the controller controls the screw pump and the heat storage tank circulating water pump according to the data acquired by the sensor system. The implementation scheme is beneficial to large-scale automatic production.
Description
Technical Field
The application relates to production equipment, in particular to a high-temperature anaerobic digestion system and a control method thereof.
Background
At present, the preparation of biomass energy by utilizing common agricultural wastes such as straws, excrement and the like is one of the development directions of environmental protection technologies. At present, the high-temperature anaerobic digestion system mainly adopts small-sized equipment, the automation degree of the small-sized equipment is not high, the manual participation degree is high, the conversion rate is low, and the high-temperature anaerobic digestion system is not suitable for large-scale production.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a high-temperature anaerobic digestion system and a control method thereof, so as to realize automatic large-scale production.
In one aspect, embodiments herein provide a thermophilic anaerobic digestion system, comprising:
the storage room is used for storing raw materials;
a heat storage tank for storing heat;
the pretreatment tank is internally provided with a stirrer and is used for pretreating raw materials;
the hydrolysis acidification tank is used for acidifying the pretreated feed liquid to obtain acid liquid;
an anaerobic digestion tank for subjecting the acid liquor to anaerobic digestion to produce biogas;
the biogas liquid pool is used for storing feed liquid discharged by the anaerobic digestion tank, wherein the biogas liquid flows back to the pretreatment pool;
the gas storage tank is used for generating biogas by the anaerobic digestion tank;
the screw pump is used for transporting liquid materials among the storage room, the pretreatment tank, the hydrolysis acidification tank and the anaerobic digestion tank;
the heat storage tank circulating water pump is used for conveying hot water in the heat storage tank to realize temperature control;
the sensor system is used for collecting one or more of pH value, temperature, liquid level, flow and oxidation-reduction potential in the pretreatment tank, the hydrolysis-acidification tank, the anaerobic digestion tank and the biogas slurry tank;
and the controller controls the screw pump and the heat storage tank circulating water pump according to the data acquired by the sensor system.
In some embodiments, the controller is further configured to provide configuration interfaces for target liquid levels of the anaerobic reaction tank and the hydrolysis acidification tank, the hydrolysis acidification tank temperature, the working temperature of the reaction tank temperature, the feed liquid addition amount and the heat storage tank valve position control target.
In some embodiments, the controller is further configured to provide configuration interfaces for target liquid levels of the anaerobic reaction tank and the hydrolysis acidification tank, the hydrolysis acidification tank temperature, the working temperature of the reaction tank temperature, the feed liquid addition amount and the heat storage tank valve position control target.
In some embodiments, the pretreatment tank is made of brick-concrete materials, a stainless steel heating coil is arranged at the bottom of the pretreatment tank, and the temperature in the pretreatment tank is maintained by means of hot water conveyed by the heat storage tank.
In some embodiments, the hydrolysis acidification tank and the anaerobic digestion tank are both provided with a carbon steel anticorrosive coating inside, and stainless steel heating plates at the bottoms, and the hydrolysis acidification tank maintains the temperature in the tank by means of hot water delivered by the heat storage tank.
In some embodiments, the sensor system comprises a first temperature sensor, a first ph sensor, a first oxidation reduction potential ORP sensor disposed in the pretreatment tank; the first liquid level sensor, the second temperature sensor, the second acidity and alkalinity sensor and the second oxidation reduction potential ORP sensor are arranged in the hydrolysis acidification tank; the second liquid level sensor, the third temperature sensor, the third pH value sensor and the third oxidation-reduction potential ORP sensor are arranged in the anaerobic digestion reaction tank; and the fourth temperature sensor is arranged in the biogas liquid pool.
In some embodiments, the hydrolysis acidification tank is provided with a plurality of sensor monitoring points along the longitudinal direction of the inner side wall, the monitoring points are uniformly distributed from 0.5 meter above the tank bottom to 0.5 meter below the tank top, and a first liquid level sensor, a second acid-base sensor and a second oxidation reduction potential ORP sensor are arranged at each sensor monitoring point.
In some embodiments, the anaerobic digestion reaction tank is provided with a plurality of sensor monitoring points along the longitudinal direction of the inner side wall, the monitoring points are uniformly distributed from 0.5 meter above the tank bottom to 0.5 meter below the tank top, and a second liquid level sensor, a third pH value sensor and a third oxidation reduction potential ORP sensor are arranged at each sensor monitoring point.
In another aspect, an embodiment of the present application provides a method for controlling a thermophilic anaerobic digestion system, including:
controlling feed liquid in the pretreatment tank to enter a hydrolysis acidification tank after the feed liquid is pretreated for 24 hours, simultaneously, feeding the feed liquid with the same flow in the hydrolysis acidification tank into an anaerobic reaction tank, and feeding the feed liquid with the same flow in the anaerobic reaction tank into a biogas liquid tank;
the biogas slurry in the biogas slurry tank and new raw materials are mixed into the pretreatment tank again;
in the process, the feeding condition is determined by detecting the feeding flow pumps of all stages and the liquid level height in all tanks.
In some embodiments, the method further comprises:
when the actual liquid level of the hydrolysis acidification tank is constantly higher than the set high liquid level, a feed screw pump of the reaction tank is started to reduce the liquid level;
when the actual liquid level is lower than the set low liquid level, stopping the feeding screw pump of the reaction tank;
when the actual liquid level of the reaction tank is constantly higher than the set high liquid level, starting a biogas slurry reflux screw pump to reduce the liquid level of the reaction tank;
when the actual liquid level is lower than the set low liquid level, stopping the biogas slurry reflux screw pump;
when the feed liquid flow meter displays that the flow is equal to the set feed quantity value, the feed screw pump automatically stops.
In some embodiments, the method further comprises:
when the temperature in the hydrolysis acidification tank is higher than 40.2 ℃, a circulating water pump of the heat storage tank leading to the hydrolysis acidification tank is closed; when the temperature in the hydrolysis acidification tank is lower than 40.0 ℃, a circulating water pump of the heat storage tank leading to the hydrolysis acidification tank is started to control the temperature in the hydrolysis acidification tank to be not lower than 39 ℃;
when the temperature in the anaerobic reaction tank is higher than 53.2 ℃, a heat storage tank circulating water pump leading to the anaerobic reaction tank is closed; when the temperature in the anaerobic reaction tank is lower than 53.0 ℃, a circulating water pump of the heat storage tank leading to the anaerobic reaction tank is started to control the temperature in the anaerobic reaction tank to be not lower than 52.0 ℃;
when the anaerobic reaction tank is in the range of 52.9-52.0 ℃, the opening degree of an electric control valve of a circulating water pump of the heat storage tank is sequentially adjusted to 100% of the opening degree of the valve according to the adjustment degree of 10% corresponding to 0.1 ℃, wherein the opening degree of the corresponding electric control valve is lower when the temperature is higher.
The embodiment of the application has set up between storing, the heat storage tank, the preliminary treatment pond, hydrolysis acidification tank, anaerobic digestion tank, the natural pond liquid pond, the gas holder, the screw pump, heat storage tank circulating water pump, sensor system and controller, utilize the screw pump can realize the liquid material conveying between each unit, the controller can realize that liquid material is automatic to be carried based on the signal control screw pump that the sensor gathered, except that need feed in between storing, can realize automated control, heat storage tank and circulating water pump have been set up simultaneously, the controller can pass through hydrothermal form with the heat in the heat storage tank at each unit is automatic to be transmitted based on the signal control circulating water pump that the sensor gathered, therefore, can reduce artifical intervention degree through implementing this application, realize the automated production of higher degree, and is suitable for using among the large-scale production.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of a thermophilic anaerobic digestion system according to an embodiment of the present application;
FIG. 2 is a functional configuration interface provided by an embodiment of the present application;
FIG. 3 is a flow chart of a control method provided by an embodiment of the present application;
FIG. 4 is a flow chart of sub-steps of step S3;
FIG. 5 is a flowchart of the temperature control step;
fig. 6 is a schematic diagram of liquid level and temperature control.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below through embodiments with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
Referring to fig. 1, a thermophilic anaerobic digestion system includes:
the storage room is used for storing raw materials; the corn straw and the excrement raw material are stored, a raw material foundation is provided for the industry, and workers can feed materials to the storage room. The storage room adopts concrete ground and adopts a brick-concrete structure. Simple structure, easy implementation and low cost.
The heat storage tank is used for storing heat and providing a constant-temperature heat source for the high-temperature anaerobic digestion system; the heating is carried out by adopting three-phase voltage of 380V and 50 Hz. The heat storage tank mainly adopts water as a heat storage medium, and the specific heat capacity of the water is large, so that the water is easy to convey.
The pretreatment tank is internally provided with a stirrer and is used for pretreating raw materials. Pretreatment pond is the brick material that mixes, pretreatment bottom of the pool portion is provided with stainless steel heating coil, pretreatment pond relies on the hot water that heat storage tank carried to maintain temperature in the pond. A first temperature sensor, a first pH value sensor and a first oxidation-reduction potential ORP sensor in the pretreatment tank. The physical state in the pool can be sensed by the controller through the arrangement of the sensor. The oxidation-reduction potential (ORP) reflects the macroscopic oxidation-reduction of the solution. The higher the oxidation-reduction potential, the stronger the oxidation, the lower the potential, the weaker the oxidation, and the measurement principle of ORP is similar to pH.
And the hydrolysis acidification tank is used for acidifying the pretreated feed liquid to obtain acid liquid. The hydrolysis acidification tank is internally provided with a carbon steel anticorrosive coating, and the bottom of the hydrolysis acidification tank is provided with a stainless steel heating plate. A first liquid level sensor, a second temperature sensor, a second acidity-alkalinity sensor and a second oxidation-reduction potential ORP sensor in the hydrolysis acidification tank.
An anaerobic digestion tank for subjecting the acid liquor to anaerobic digestion to produce biogas; the anaerobic digestion tank is internally provided with a carbon steel anticorrosive coating, the bottom of the anaerobic digestion tank is provided with a stainless steel heating plate, and the hydrolysis acidification tank maintains the temperature in the tank by hot water conveyed by the heat storage tank. A second liquid level sensor, a third temperature sensor, a third pH value sensor and a third oxidation reduction potential ORP sensor in the anaerobic digestion reaction tank. The carbon steel anti-corrosion coating can well resist corrosion in the acidification environment, and the service life of the equipment is prolonged. The hydrolysis acidification tank and the anaerobic digestion reaction tank are provided with a plurality of sensor monitoring points along the longitudinal direction of the inner side wall, the monitoring points are uniformly distributed from 0.5 meter above the tank bottom to 0.5 meter below the tank top, and each sensor monitoring point is uniformly provided with a liquid level sensor, a pH value sensor and an oxidation-reduction potential ORP sensor. Through setting up the sensor like this, can be under the different circumstances of liquid level accurate detection jar interior data. The determination method of the pH value, the temperature value and the ORP value comprises the following steps: and (5) performing difference between every two measured values, removing two measured values with the largest difference, and taking the average value of the remaining three measured values as the monitoring parameter of the tank body.
And the biogas liquid pool is used for storing the feed liquid discharged by the anaerobic digestion tank, wherein the biogas liquid flows back to the pretreatment pool. The biogas liquid pool adopts a brick-concrete structure. Simple structure, and is suitable for on-site construction according to requirements. A fourth temperature sensor in the biogas liquid pool is arranged.
And the gas storage tank is used for generating biogas by the anaerobic digestion tank. An independent three-layer film gas holder can be adopted to be matched with a booster fan. A three-phase, 380V and 50Hz power supply is adopted.
The screw pump is used for transporting liquid materials among the storage room, the pretreatment tank, the hydrolysis acidification tank and the anaerobic digestion tank. It should be understood that the screw pump can be provided in plurality as required to meet the liquid conveying between the units.
And the heat storage tank circulating water pump is used for conveying hot water in the heat storage tank to realize temperature control.
And the sensor system is used for collecting one or more of pH value, temperature, liquid level, flow and oxidation-reduction potential in the pretreatment tank, the hydrolysis-acidification tank, the anaerobic digestion tank and the biogas slurry tank.
And the controller controls the screw pump and the heat storage tank circulating water pump according to the data acquired by the sensor system. Referring to fig. 2, the controller is further configured to provide a configuration interface for the target liquid levels of the anaerobic reaction tank and the hydrolysis acidification tank, the temperature of the hydrolysis acidification tank, the working temperature of the reaction tank, the feed liquid addition amount, and the valve position control target of the heat storage tank. The detection objects of the controller comprise the pH value, the temperature and the oxidation-reduction potential ORP of each equipment unit, the flow rate of the material liquid transported among the equipment units and the air inlet flow rate of the gas storage cabinet. After an automatic control button of the system is clicked, an automatic working interface is entered, a program enters an automatic working mode, and automatic liquid level control of an anaerobic reaction tank and a hydrolysis acidification tank (a pre-reaction tank), automatic control of the temperature of the hydrolysis acidification tank and the temperature of the reaction tank, automatic feed liquid adding control, automatic valve position adjustment control of a heat storage tank and automatic interlocking control of a hot water pump can be realized. Under the automatic control debugging mode, can set for the temperature of hydrolysis-acidification tank and anaerobic reaction jar, the regulation intensity in automatic regulation cycle and every cycle, retort and hydrolysis-acidification tank (preliminary reaction jar) have automatic liquid level control function simultaneously, can set for the height liquid level of the jar body, through the ultrasonic wave level gauge, real-time detection jar interior liquid level.
Referring to table 1, the function of each unit is shown:
TABLE 1
Referring to fig. 3, the present embodiment provides a control method of a thermophilic anaerobic digestion system, including:
s1, controlling the feed liquid in the pretreatment tank to enter a hydrolysis acidification tank after being pretreated for 24 hours, simultaneously controlling the feed liquid with the same flow in the hydrolysis acidification tank to enter an anaerobic reaction tank, and controlling the feed liquid with the same flow in the anaerobic reaction tank to enter a biogas liquid tank;
s2, mixing the biogas slurry and the new raw materials in the biogas slurry tank into the pretreatment tank again;
and S3, determining the feeding condition by detecting the feeding flow pumps of all stages and the liquid level height in all the tanks in the process. In particular, in the present embodiment, the liquid level is monitored by the liquid level sensor, so that the liquid level can be maintained near a constant target value by the controller, which is beneficial to the efficiency of biochemical reaction.
Referring to fig. 4, in step S3, the method further includes:
and S41, when the actual liquid level of the hydrolysis acidification tank is constantly higher than the set high liquid level, starting a feed screw pump of the reaction tank to reduce the liquid level.
And S42, stopping the reaction tank feeding screw pump when the actual liquid level is less than the set low liquid level.
And S43, when the actual liquid level of the reaction tank is constantly higher than the set high liquid level, starting the biogas slurry reflux screw pump to reduce the liquid level of the reaction tank.
And S44, stopping the biogas slurry reflux screw pump when the actual liquid level is less than the set low liquid level.
And S45, when the feeding amount is set, the feeding screw pump is automatically started, and when the flow rate displayed by the feed liquid flow meter is equal to the set feeding amount value, the feeding screw pump is automatically stopped.
In this embodiment, the operation of the corresponding screw pump is controlled based on the liquid level sensor of each unit, thereby achieving the object of controlling the liquid level to the set value. When the actual liquid level of the reaction tank is constantly higher than (exceeds the set time) the set liquid level, the biogas slurry is directly drained to the reaction tank through the reflux screw pump.
Referring to fig. 5, in some embodiments, the method further includes a step of controlling temperature:
s51, when the temperature in the hydrolysis acidification tank is higher than 40.2 ℃, closing a circulating water pump of the heat storage tank leading to the hydrolysis acidification tank; and when the temperature in the hydrolysis acidification tank is lower than 40.0 ℃, a circulating water pump of the heat storage tank leading to the hydrolysis acidification tank is started to control the temperature in the hydrolysis acidification tank to be not lower than 39 ℃. In this embodiment, the actual control temperature is 40 degrees celsius, and when the control temperature exceeds 40.2 degrees celsius, the purpose of natural cooling is achieved by turning off the circulating water pump of the heat storage tank. When the temperature is low, the water pump can be turned on again to increase the temperature.
S52, when the temperature in the anaerobic reaction tank is higher than 53.2 ℃, a heat storage tank circulating water pump leading to the anaerobic reaction tank is closed; when the temperature in the anaerobic reaction tank is lower than 53.0 ℃, a circulating water pump of the heat storage tank leading to the anaerobic reaction tank is started to control the temperature in the anaerobic reaction tank to be not lower than 52.0 ℃. In the step, the principle is similar, and the temperature is controlled to be constant around 53 ℃ by using the hot water conveyed to the heat storage tank by the circulating water pump.
When the anaerobic reaction tank is in the range of 52.9-52.0 ℃, the opening degree of an electric control valve of a circulating water pump of the heat storage tank is sequentially adjusted to 100% of the opening degree of the valve according to the adjustment degree of 10% corresponding to 0.1 ℃, wherein the opening degree of the corresponding electric control valve is lower when the temperature is higher. The embodiment links the opening degree of the valve and the temperature difference, and can realize automation in a simple mode. Specifically, 52.9 ℃ corresponds to 10% opening, 52.8 ℃ corresponds to 20% opening, 52.1 ℃ corresponds to 90% opening, and 52 ℃ corresponds to 100% opening.
It can be understood that the control method can realize automatic temperature control with the temperature control precision within 1 ℃, and can meet the requirement of large-scale production.
Referring to fig. 6, in fig. 6, the variables are as follows:
SP1 raw material level set point;
SP2, feed liquid temperature set value;
PV1 raw material level;
PV2 raw material temperature;
g1(s): taking the height of the feed liquid in the tank as a transfer function of a control object;
g2(s): taking the temperature of the feed liquid in the tank as a transfer function of a control object;
g3(s): a transfer function of feed to temperature disturbances within the tank;
f, (x) correcting the liquid level height;
the control principle of the system is as follows:
raw material level control system (upper closed loop): the deviation is generated between the set value of the liquid level of the raw material and the height of the actual liquid level, the liquid level is controlled by controlling the start and stop of the feed screw pump through the liquid level controller, the liquid level height value needs to be judged in practice, when the liquid level height value is lower than the set liquid level range, the feeding needs to be continued, and when the value is higher than the set range, the discharge screw pump needs to be opened to discharge part of biogas slurry. The feed rate will cause a disturbance in the feed liquid temperature in the tank, this disturbance being determined by the function G 3 (s) are described.
Temperature control system (lower closed loop): the deviation is generated between the temperature value set value and the temperature actual value, and the temperature is controlled by controlling the opening of a water inlet valve of the heating coil through the temperature controller. When the deviation between the temperature set value of the raw material in the tank and the actual temperature of the raw material is overlarge, the height set value of the raw material liquid is corrected. For example, the set value of the raw material temperature is 53 degrees, the actual temperature of the feed liquid is reduced to 52 degrees, the temperature deviation is large, on one hand, the temperature is increased by adjusting the opening degree of a water inlet valve, on the other hand, the height of the feed liquid is reduced, namely, the feeding amount is reduced, and the temperature increase of the raw material in the tank body is accelerated. Wherein the temperature of the pretreatment is 35 ℃ and 40 ℃ when the pretreatment is used for feeding the hydrolysis acidification tank, the feeding amount of the pretreatment is about 1/7 of the total stock solution volume of the hydrolysis acidification tank, and the theoretical temperature after mixing is 39.3 ℃. The feeding amount of the hydrolysis acidification tank to the anaerobic reaction tank is about 4-5% of the total volume of the anaerobic reaction tank, and after 5% of 40 ℃ feed liquid is added into 95% of 53 ℃ feed liquid, the theoretical value of the mixing temperature is 52.35 ℃.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims (10)
1. A thermophilic anaerobic digestion system comprising:
the storage room is used for storing raw materials;
a heat storage tank for storing heat;
the pretreatment tank is internally provided with a stirrer and is used for pretreating raw materials;
the hydrolysis acidification tank is used for acidifying the pretreated feed liquid to obtain acid liquid;
an anaerobic digestion tank for subjecting the acid liquor to anaerobic digestion to produce biogas;
the biogas liquid pool is used for storing feed liquid discharged by the anaerobic digestion tank, wherein the biogas liquid flows back to the pretreatment pool;
the gas storage tank is used for generating biogas by the anaerobic digestion tank;
the screw pump is used for transporting liquid materials among the storage room, the pretreatment tank, the hydrolysis acidification tank and the anaerobic digestion tank;
the heat storage tank circulating water pump is used for conveying hot water in the heat storage tank to realize temperature control;
the sensor system is used for collecting one or more of pH value, temperature, liquid level, flow and oxidation-reduction potential in the pretreatment tank, the hydrolysis-acidification tank, the anaerobic digestion tank and the biogas slurry tank;
and the controller controls the screw pump and the heat storage tank circulating water pump according to the data acquired by the sensor system.
2. The thermophilic anaerobic digestion system of claim 1 wherein the controller is further configured to provide configuration interfaces for target liquid levels of the anaerobic and hydrolytic acidification tanks, hydrolytic acidification tank temperature, operating temperature of reaction tank temperature, feed liquid addition and thermal storage tank valve position control targets.
3. The thermophilic anaerobic digestion system as claimed in claim 1, wherein the pretreatment tank is made of brick-concrete material, a stainless steel heating coil is arranged at the bottom of the pretreatment tank, and the temperature in the pretreatment tank is maintained by hot water delivered by the heat storage tank.
4. The thermophilic anaerobic digestion system as claimed in claim 1, wherein carbon steel anti-corrosion coatings are arranged inside the hydrolysis acidification tank and the anaerobic digestion tank, stainless steel heating plates are arranged at the bottoms of the hydrolysis acidification tank and the anaerobic digestion tank, and the hydrolysis acidification tank maintains the temperature in the tank by means of hot water delivered by the heat storage tank.
5. The thermophilic anaerobic digestion system of claim 1, wherein the sensor system comprises a first temperature sensor, a first pH sensor, a first Oxidation Reduction Potential (ORP) sensor disposed in a pretreatment tank; the first liquid level sensor, the second temperature sensor, the second acidity and alkalinity sensor and the second oxidation reduction potential ORP sensor are arranged in the hydrolysis acidification tank; the second liquid level sensor, the third temperature sensor, the third pH value sensor and the third oxidation-reduction potential ORP sensor are arranged in the anaerobic digestion reaction tank; and the fourth temperature sensor is arranged in the biogas liquid pool.
6. The thermophilic anaerobic digestion system of claim 5, wherein the hydrolytic acidification tank is provided with a plurality of sensor monitoring points along the longitudinal direction of the inner side wall, each monitoring point is uniformly distributed from 0.5 meter above the tank bottom to 0.5 meter below the tank top, and a first liquid level sensor, a second acidity and alkalinity sensor and a second oxidation reduction potential ORP sensor are arranged at each sensor monitoring point.
7. The thermophilic anaerobic digestion system of claim 5, wherein a plurality of sensor monitoring points are arranged along the longitudinal direction of the inner side wall of the anaerobic digestion reaction tank, each monitoring point is uniformly distributed from 0.5 meter above the tank bottom to 0.5 meter below the tank top, and a second liquid level sensor, a third pH value sensor and a third oxidation reduction potential ORP sensor are arranged at each sensor monitoring point.
8. A method of controlling a thermophilic anaerobic digestion system as claimed in claims 1 to 7, comprising:
controlling feed liquid in the pretreatment tank to enter a hydrolysis acidification tank after the feed liquid is pretreated for 24 hours, simultaneously, feeding the feed liquid with the same flow in the hydrolysis acidification tank into an anaerobic reaction tank, and feeding the feed liquid with the same flow in the anaerobic reaction tank into a biogas liquid tank;
the biogas slurry in the biogas slurry tank and new raw materials are mixed into the pretreatment tank again;
in the process, the feeding condition is determined by detecting the feeding flow pumps of all stages and the liquid level height in all tanks.
9. The method of controlling a thermophilic anaerobic digestion system as claimed in claim 8, further comprising:
when the actual liquid level of the hydrolysis acidification tank is constantly higher than the set high liquid level, a feed screw pump of the reaction tank is started to reduce the liquid level;
when the actual liquid level is lower than the set low liquid level, stopping the feeding screw pump of the reaction tank;
when the actual liquid level of the reaction tank is constantly higher than the set high liquid level, starting a biogas slurry reflux screw pump to reduce the liquid level of the reaction tank;
when the actual liquid level is lower than the set low liquid level, stopping the biogas slurry reflux screw pump;
when the feed liquid flow meter displays that the flow is equal to the set feed quantity value, the feed screw pump automatically stops.
10. The method of controlling a thermophilic anaerobic digestion system as claimed in claim 9, further comprising:
when the temperature in the hydrolysis acidification tank is higher than 40.2 ℃, a circulating water pump of the heat storage tank leading to the hydrolysis acidification tank is closed; when the temperature in the hydrolysis acidification tank is lower than 40.0 ℃, a circulating water pump of the heat storage tank leading to the hydrolysis acidification tank is started to control the temperature in the hydrolysis acidification tank to be not lower than 39 ℃;
when the temperature in the anaerobic reaction tank is higher than 53.2 ℃, a heat storage tank circulating water pump leading to the anaerobic reaction tank is closed; when the temperature in the anaerobic reaction tank is lower than 53.0 ℃, a circulating water pump of the heat storage tank leading to the anaerobic reaction tank is started to control the temperature in the anaerobic reaction tank to be not lower than 52.0 ℃;
when the anaerobic reaction tank is in the range of 52.9-52.0 ℃, the opening degree of an electric regulating valve of a circulating water pump of the heat storage tank is regulated according to the temperature, wherein the opening degree of the electric regulating valve is lower when the temperature is higher in the range of 52.9-52.0 ℃.
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