Automatic control system for anaerobic fermentation of kitchen waste

Abstract

The kitchen waste anaerobic fermentation automatic control system comprises a buffer tank, an anaerobic tank is arranged on the right side of the buffer tank, conveying pipes are fixedly communicated with the two sides of the anaerobic tank, a hot water tank is arranged on the right side of the anaerobic tank, and an automatic control mechanism is arranged in an inner cavity of the anaerobic tank; according to the invention, the buffer tank is used for storing organic matters, the organic matters are in the anaerobic tank and generate biogas through anaerobism, and the fermentation temperature is medium temperature 35 DEG C or high temperature 53 DEG C. The motor and the stirring blades are arranged, the motor is used for driving the stirring blades to rotate, and when the stirring blades rotate, the organic matters in the anaerobic tank can be stirred; materials in the anaerobic tank are fully mixed, the fermented materials pass through the dehydration system to obtain biogas slurry and biogas residues, and by arranging the automatic control mechanism, pH value control, liquid level detection, monitoring alarm, temperature control and biogas detection can be automatically carried out, so that manpower consumption is reduced, and the overall automation degree of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of kitchen waste treatment, in particular to an automatic control system for anaerobic fermentation of kitchen waste. BACKGROUND

[0002] Kitchen waste refers to organic waste generated by the catering industry, kitchen and food processing industry, mainly including food residues, leftover food, fruit peels, vegetable residues, napkins and the like. These waste usually contains rich organic matter. Anaerobic fermentation of kitchen waste is a process of decomposing organic waste under anaerobic conditions by microorganisms. This process is usually referred to as anaerobic fermentation or anaerobic digestion. After fermentation, the resulting material is usually stable organic fertilizer and can be used for soil improvement of plants.

[0003] According to the application number: 202022350593.8, an automatic operation equipment for temperature control of kitchen and garbage sewage anaerobic fermentation tank is disclosed, which comprises an anaerobic tank, an electromagnetic heating tank, an intermediate water tank and a self-control device. The anaerobic tank is provided with an inner coil pipe, the lower end of the inner coil pipe is an inlet, and the upper end is an outlet. The vertical end of the first three-way pipe is connected with the inlet of the inner coil pipe in the anaerobic tank and the electromagnetic heating tank. The horizontal end of the second three-way pipe is connected with the electromagnetic heating tank and the intermediate water tank. The outlet of the inner coil pipe is connected with the intermediate water tank. The horizontal end of the first three-way pipe and the vertical end of the second three-way pipe are connected. Three or more sets of parallel inner coil pipes are arranged in the anaerobic tank, and a thermometer is arranged at the upper end of each set of inner coil pipes. The thermometer is connected with the self-control device. The parallel inner coil pipes can individually heat / cool the part of the anaerobic tank with excessively high or low temperature, and the heating / cooling efficiency is high, avoiding the problem of low heat exchange efficiency due to the excessive length of the inner coil pipe. The switching between medium-temperature anaerobic and high-temperature anaerobic conditions is supported.

[0004] The comparative case well solves the problem of low automation degree in the prior art, but the main upgrade of the anaerobic reactor is proposed, and only the temperature is controlled in the self-control aspect, lacking control of other parameters during operation of the anaerobic fermentation system, so that the overall automation degree of the device is low. SUMMARY

[0005] The present application aims to provide an automatic control system for anaerobic fermentation of kitchen waste, which has the advantages of high automation degree, and solves the problem of low overall automation degree of the device due to the lack of control of other parameters during operation of the anaerobic fermentation system.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a kind of kitchen garbage anaerobic fermentation automatic control system, including buffer tank, the right side of the buffer tank is provided with anaerobic tank, the two sides of the anaerobic tank are fixedly connected with conveying pipe, the right side of the anaerobic tank is provided with hot water tank, the inner chamber of the anaerobic tank is provided with automatic control mechanism, the top of the anaerobic tank is fixedly connected with motor, the output shaft of the motor penetrates to the inner chamber of anaerobic tank, and is transmissionally connected with stirring blade, the left side of the buffer tank is fixedly connected with feeding pipe, the right side of the hot water tank is fixedly connected with heating pipe.

[0007] Preferably, the automatic control mechanism includes pH control unit, liquid level control unit, temperature control unit, monitoring alarm unit and biogas monitoring unit.

[0008] Preferably, the pH control unit includes anaerobic pH sensor, the anaerobic pH sensor is arranged on the left side of the top of the anaerobic tank, the right side of the anaerobic tank is provided with alarm, the right side of the buffer tank is provided with feed pump, the input end of the feed pump is fixedly connected with the buffer tank, the output end of the feed pump is fixedly connected with the left end of the left side conveying pipe, the right side of the top of the anaerobic tank is provided with third PLC controller, the output end of the anaerobic pH sensor is electrically connected with the input end of the third PLC controller, and the output end of the third PLC controller is electrically connected with the input end of the alarm and the feed pump.

[0009] Preferably, the liquid level control unit includes liquid level meter, the liquid level meter is arranged on the top of the buffer tank, the surface of the feeding pipe is provided with electromagnetic valve, the right side of the buffer tank is provided with second PLC controller, the output end of the liquid level meter is electrically connected with the input end of the second PLC controller, and the output end of the second PLC controller is electrically connected with the input end of the electromagnetic valve and the feed pump.

[0010] Preferably, the temperature control unit includes first temperature sensor, the first temperature sensor is arranged on the left side of the top of the inner chamber of the anaerobic tank, the upper end of the front of the hot water tank is provided with second temperature sensor, the left side of the hot water tank is provided with hot water pump, the water inlet end of the hot water pump is fixedly connected with the hot water tank, the water outlet end of the hot water pump is fixedly connected with the right end of the right side conveying pipe, the inner chamber of the anaerobic tank is provided with jacketed heat exchanger, the surface of the heating pipe is provided with steam valve, the lower end of the front of the hot water tank is provided with first PLC controller, the output end of the first temperature sensor and the second temperature sensor is electrically connected with the input end of the first PLC controller, and the output end of the first PLC controller is electrically connected with the input end of the hot water pump and the steam valve.

[0011] Preferably, the monitoring alarm unit comprises an ORP electrode arranged at the right side of the inner cavity of the anaerobic tank, a combustible gas detector arranged at the left side of the anaerobic tank, the output ends of the ORP electrode and the combustible gas detector are electrically connected with the input end of the third PLC controller, and the output end of the third PLC controller is electrically connected with the input end of the alarm.

[0012] Preferably, the biogas monitoring unit comprises a gas-sensitive resistor, a central processing unit and a display screen, the gas-sensitive resistor is arranged at the right side of the inner cavity of the anaerobic tank, the output end of the gas-sensitive resistor is electrically connected with the input end of the central processing unit, and the output end of the central processing unit is electrically connected with the input end of the display screen.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] The buffer tank is arranged for storing the degradable organic matter after pretreatment such as crushing and sorting, the material in the buffer tank can be conveyed to the inside of the anaerobic tank through the left conveying pipe, the organic matter in the anaerobic tank can generate biogas through anaerobic fermentation at a medium temperature of 35 DEG C or a high temperature of 53 DEG C, the motor is arranged for driving the stirring blade to rotate, the stirring blade can stir the organic matter in the anaerobic tank to realize the full mixing of the material in the anaerobic tank, the fermented material can be dehydrated to obtain biogas slurry and biogas residue, the automatic control mechanism is arranged for automatically controlling the pH value, detecting the liquid level, monitoring and alarming, controlling the temperature and detecting the biogas, thereby saving the labor consumption and improving the overall automation degree of the device, the hot water tank is arranged for storing hot water, the hot water in the right hot water tank can be supplied to the anaerobic tank through the right conveying pipe to control the temperature in the anaerobic tank, and the feeding pipe is arranged for facilitating the addition of material to the inside of the buffer tank. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a front view of the structure of the present application;

[0016] Figure 2 It is a structure diagram of the automatic control mechanism of the present application;

[0017] Figure 3 It is a system flow chart of the pH value control unit of the present application;

[0018] Figure 4 It is a system flow chart of the liquid level control unit of the present application;

[0019] Figure 5 It is a system flow chart of the temperature control unit of the present application;

[0020] Figure 6System flow chart of the monitoring alarm unit of the present application;

[0021] Figure 7 System flow chart of the biogas monitoring unit of the present application.

[0022] In the figure: 1, buffer tank; 2, anaerobic tank; 3, conveying pipe; 4, hot water tank; 5, automatic control mechanism; 51, pH control unit; 511, anaerobic pH sensor; 512, alarm; 513, feeding pump; 514, third PLC controller; 52, liquid level control unit; 521, liquid level meter; 522, electromagnetic valve; 523, second PLC controller; 53, temperature control unit; 531, first temperature sensor; 532, second temperature sensor; 533, hot water pump; 534, jacketed heat exchanger; 535, steam valve; 536, first PLC controller; 54, monitoring alarm unit; 541, ORP electrode; 542, combustible gas detector; 55, biogas monitoring unit; 551, gas sensitive resistor; 552, central processing unit; 553, display screen; 6, motor; 7, stirring blade; 8, feeding pipe; 9, heating pipe. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0024] The buffer tank 1, anaerobic tank 2, conveying pipe 3, hot water tank 4, automatic control mechanism 5, pH control unit 51, anaerobic pH sensor 511, alarm 512, feeding pump 513, third PLC controller 514, liquid level control unit 52, liquid level meter 521, electromagnetic valve 522, second PLC controller 523, temperature control unit 53, first temperature sensor 531, second temperature sensor 532, hot water pump 533, jacketed heat exchanger 534, steam valve 535, first PLC controller 536, monitoring alarm unit 54, ORP electrode 541, combustible gas detector 542, biogas monitoring unit 55, gas sensitive resistor 551, central processing unit 552, display screen 553, motor 6, stirring blade 7, feeding pipe 8, heating pipe 9 and 10 components of the present application are all general standard components or components known to those skilled in the art, and their structures and principles can be known by technical personnel through technical manuals or obtained through conventional experimental methods.

[0025] Embodiment 1

[0026] As Figures 1-7As shown, the first embodiment of the present invention provides an automatic control system for anaerobic fermentation of food waste. The automatic control system for anaerobic fermentation of food waste comprises a buffer tank 1, an anaerobic tank 2 is provided on the right side of the buffer tank 1, a delivery pipe 3 is fixedly connected to both sides of the anaerobic tank 2, a hot water tank 4 is provided on the right side of the anaerobic tank 2, an automatic control mechanism 5 is provided in the inner cavity of the anaerobic tank 2, a motor 6 is fixedly connected to the top of the anaerobic tank 2, the output shaft of the motor 6 passes through the inner cavity of the anaerobic tank 2 and is transmission-connected to a stirring blade 7, a feeding pipe 8 is fixedly connected to the left side of the buffer tank 1, and a heating pipe 9 is fixedly connected to the right side of the hot water tank 4.

[0027] The automatic control mechanism 5 includes a pH value control unit 51 , a liquid level control unit 52 , a temperature control unit 53 , a monitoring and alarm unit 54 and a biogas monitoring unit 55 .

[0028] like Figures 1-7 As shown, the buffer tank 1 stores degradable organic matter after pre-treatment such as crushing and sorting. The left conveying pipe 3 is used to transport the material inside the buffer tank 1 to the inside of the anaerobic tank 2, and the organic matter is fermented inside the anaerobic tank 2. During this process, the pH value control unit 51 is used to control the pH value inside the anaerobic tank 2, the liquid level control unit 52 is used to control the liquid level inside the buffer tank 1, the temperature control unit 53 is used to control the temperature inside the anaerobic tank 2, the monitoring and alarm unit 54 is used to monitor the content of some gases inside the anaerobic tank 2, and the biogas monitoring unit 55 is used to detect the biogas inside the anaerobic tank 2.

[0029] Example 2

[0030] Reference Figures 3-5 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0031] In this embodiment, the pH control unit 51 includes an anaerobic pH sensor 511, which is arranged on the left side of the top of the anaerobic tank 2. An alarm 512 is provided on the right side of the anaerobic tank 2. A feed pump 513 is provided on the right side of the buffer tank 1. The input end of the feed pump 513 is fixedly connected to the buffer tank 1, and the output end of the feed pump 513 is fixedly connected to the left end of the left delivery pipe 3. A third PLC controller 514 is provided on the right side of the top of the anaerobic tank 2. The output end of the anaerobic pH sensor 511 is electrically connected to the input end of the third PLC controller 514, and the output end of the third PLC controller 514 is electrically connected to the input end of the alarm 512 and the feed pump 513.

[0032] The liquid level control unit 52 comprises a liquid level meter 521 arranged at the top of the buffer tank 1, the surface of the filling pipe 8 is provided with an electromagnetic valve 522, the right side of the buffer tank 1 is provided with a second PLC controller 523, the output end of the liquid level meter 521 is electrically connected with the input end of the second PLC controller 523, and the output end of the second PLC controller 523 is electrically connected with the input end of the electromagnetic valve 522 and the feed pump 513.

[0033] The temperature control unit 53 comprises a first temperature sensor 531 arranged at the left side of the top of the inner cavity of the anaerobic tank 2, a second temperature sensor 532 arranged at the upper end of the front of the hot water tank 4, a hot water pump 533 arranged at the left side of the hot water tank 4, the water inlet end of the hot water pump 533 is fixedly communicated with the hot water tank 4, the water outlet end of the hot water pump 533 is fixedly communicated with the right end of the right side conveying pipe 3, the inner cavity of the anaerobic tank 2 is provided with a jacketed heat exchanger 534, the surface of the heating pipe 9 is provided with a steam valve 535, the lower end of the front of the hot water tank 4 is provided with a first PLC controller 536, the output ends of the first temperature sensor 531 and the second temperature sensor 532 are electrically connected with the input end of the first PLC controller 536, and the output end of the first PLC controller 536 is electrically connected with the input end of the hot water pump 533 and the steam valve 535.

[0034] As Figures 3-5As shown, the anaerobic pH sensor 511 detects the pH value inside the anaerobic tank 2, when the detected value is lower than the preset value of the third PLC controller 514, the feed pump 513 can reduce the feed of the anaerobic tank 2 until the set value, when the pH decreases to the set value, the feed is stopped, when the pH is lower than the set value and the alkalinity is lower than the set value, the alkalinity is adjusted, the pH returns to the set value, and the feed is gradually restored. The liquid level meter 521 detects the liquid level of the material inside the buffer tank 1, when the liquid level inside the buffer tank 1 is higher than the set value of the second PLC controller 523, the second PLC controller 523 closes the electromagnetic valve 522 and starts the feed pump 513, when the liquid level of the buffer tank 1 is lower than the set value, the electromagnetic valve 522 is opened and the feed pump 513 is closed. The first temperature sensor 531 and the second temperature sensor 532 are respectively used to detect the temperature inside the anaerobic tank 2 and the hot water tank 4, the temperature inside the anaerobic tank 2 is controlled by the jacketed heat exchanger 534, when the temperature inside the anaerobic tank 2 is lower than the preset value of the first PLC controller 536, the first PLC controller 536 sends a signal to the hot water pump 533, the hot water pump 533 sends hot water inside the hot water tank 4 to the inside of the jacketed heat exchanger 534 through the right side delivery pipe 3, and the circulating material inside the anaerobic tank 2 is heated by the hot water, when the temperature of the circulating material reaches the set value, the first PLC controller 536 closes the hot water pump 533 and stops heating, when the second temperature sensor 532 detects that the temperature inside the hot water tank 4 is lower than the preset value of the first PLC controller 536, the steam valve 535 is opened to heat the hot water tank 4, when the temperature of the hot water tank 4 reaches the set value, the first PLC controller 536 automatically closes the steam valve 535 and stops heating.

[0035] Embodiment 3

[0036] Referring to Figures 6-7 For the third embodiment of the present application, the present embodiment is based on the previous two embodiments.

[0037] In the present embodiment, the monitoring and alarm unit 54 includes an ORP electrode 541, which is arranged on the right side of the inner cavity of the anaerobic tank 2, and a combustible gas detector 542, which is arranged on the left side of the anaerobic tank 2. The output terminals of the ORP electrode 541 and the combustible gas detector 542 are electrically connected to the input terminal of the third PLC controller 514, and the output terminal of the third PLC controller 514 is electrically connected to the input terminal of the alarm 512.

[0038] The biogas monitoring unit 55 includes a gas-sensitive resistor 551, a central processing unit 552, and a display screen 553. The gas-sensitive resistor 551 is arranged on the right side of the inner cavity of the anaerobic tank 2, the output terminal of the gas-sensitive resistor 551 is electrically connected to the input terminal of the central processing unit 552, and the output terminal of the central processing unit 552 is electrically connected to the input terminal of the display screen 553.

[0039] AsFigures 6-7 As shown, the ORP electrode 541 and the combustible gas detector 542 are used for detecting the ORP and methane inside the anaerobic tank 2 respectively, when the detection results are higher than the preset value of the third PLC controller 514, the third PLC controller 514 will start the alarm 512 to alarm the staff, the resistance value of the gas sensitive resistor 551 is higher, when the biogas exists in the environment and contacts with the sensor surface, the biogas and the gas sensitive resistor 551 react chemically, causing the conductivity of the gas sensitive resistor 551 to change, thereby causing the resistance value to change, the size of the change is proportional to the concentration of the biogas in the environment, through the change of the resistance value, it is converted into an electric signal related to the concentration of the biogas, the electric signal can be further read and processed by the sensor interface or the data acquisition system, and the central processing unit 552 and the display screen 553 are fed back.

[0040] The use method of the kitchen waste anaerobic fermentation automatic control system includes the following steps:

[0041] The buffer tank 1 stores the degradable organic matter after pretreatment such as crushing and sorting. The left side conveying pipe 3 is used to convey the material in the buffer tank 1 to the inside of the anaerobic tank 2. The organic matter is fermented in the inside of the anaerobic tank 2. In this process, the anaerobic pH sensor 511 detects the pH value in the inside of the anaerobic tank 2. When the detection value is lower than the preset value of the third PLC controller 514, the feeding pump 513 can reduce the feeding of the anaerobic tank 2 until the set value. When the pH decreases to the set value, the feeding is stopped. When the pH is lower than the set value and the alkalinity is lower than the set value, the alkaline is added for adjustment. The pH is restored to the set value. The feeding is gradually restored. The liquid level meter 521 detects the liquid level of the material in the inside of the buffer tank 1. When the liquid level in the inside of the buffer tank 1 is higher than the set value of the second PLC controller 523, the second PLC controller 523 closes the electromagnetic valve 522 and starts the feeding pump 513. When the liquid level of the buffer tank 1 is lower than the set value, the electromagnetic valve 522 is opened and the feeding pump 513 is closed. The first temperature sensor 531 and the second temperature sensor 532 are respectively used to detect the temperature in the inside of the anaerobic tank 2 and the hot water tank 4. The temperature in the inside of the anaerobic tank 2 is controlled by the jacketed heat exchanger 534. When the temperature in the inside of the anaerobic tank 2 is lower than the preset value of the first PLC controller 536, the first PLC controller 536 transmits a signal to the hot water pump 533. The hot water pump 533 conveys the hot water in the inside of the hot water tank 4 to the inside of the jacketed heat exchanger 534 through the right side conveying pipe 3. The circulating material in the inside of the anaerobic tank 2 is heated by the hot water. When the temperature of the circulating material reaches the set value, the first PLC controller 536 closes the hot water pump 533 and stops heating. When the second temperature sensor 532 detects that the temperature in the inside of the hot water tank 4 is lower than the preset value of the first PLC controller 536, the steam valve 535 is opened to heat the hot water tank 4. When the temperature of the hot water tank 4 reaches the set value, the first PLC controller 536 automatically closes the steam valve 535 and stops heating. The ORP electrode 541 and the combustible gas detector 542 are respectively used to detect the ORP and the methane in the inside of the anaerobic tank 2. When the detection result is higher than the preset value of the third PLC controller 514, the third PLC controller 514 starts the alarm 512 to alarm the staff. The resistance value of the gas sensitive resistor 551 is high. When the biogas exists in the environment and contacts the surface of the sensor, the biogas reacts with the gas sensitive resistor 551, causing the conductivity of the gas sensitive resistor 551 to change, thereby causing the resistance value to change. The size of the change is proportional to the concentration of the biogas in the environment. Through the change of the resistance value, it is converted into an electric signal related to the concentration of the biogas. The electric signal can be further read and processed by the sensor interface or the data acquisition system and fed back by the central processing unit 552 and the display screen 553 and reminded to the staff through the display screen 553. Whether the feeding changes; whether the temperature of the anaerobic tank is stable; whether the pH of the anaerobic system is stable; whether the ORP of the system changes.

[0042] The standard parts used in the present application can be purchased from the market, and can be ordered according to the description and drawings, and the specific connection of each part is achieved by using conventional means such as bolts, rivets, welding, etc. in the prior art, the mechanical, parts and equipment are conventional models in the prior art, the control method is automatically controlled by the controller, the control circuit of the controller can be realized by simple programming by the person skilled in the art, which belongs to the common knowledge in the art, and the present application is mainly used to protect the mechanical device, so the control method and circuit connection will not be explained in detail.

[0043] It should be noted that, in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0044] Although embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic control system for anaerobic fermentation of food waste, comprising a buffer tank (1), characterized in that: An anaerobic tank (2) is provided on the right side of the buffer tank (1), and both sides of the anaerobic tank (2) are fixedly connected with a delivery pipe (3). A hot water tank (4) is provided on the right side of the anaerobic tank (2), and an automatic control mechanism (5) is provided in the inner cavity of the anaerobic tank (2). A motor (6) is fixedly connected to the top of the anaerobic tank (2), and the output shaft of the motor (6) passes through the inner cavity of the anaerobic tank (2) and is transmission-connected with a stirring blade (7). A feeding pipe (8) is fixedly connected to the left side of the buffer tank (1), and a heating pipe (9) is fixedly connected to the right side of the hot water tank (4).

2. The automatic control system for anaerobic fermentation of kitchen waste according to claim 1, characterized in that: The automatic control mechanism (5) comprises a pH value control unit (51), a liquid level control unit (52), a temperature control unit (53), a monitoring and alarm unit (54) and a biogas monitoring unit (55).

3. The automatic control system for anaerobic fermentation of kitchen waste according to claim 2, characterized in that: The pH value control unit (51) comprises an anaerobic pH sensor (511), which is arranged on the left side of the top of the anaerobic tank (2). An alarm (512) is arranged on the right side of the anaerobic tank (2). A feed pump (513) is arranged on the right side of the buffer tank (1). The input end of the feed pump (513) is fixedly connected to the buffer tank (1), and the output end of the feed pump (513) is fixedly connected to the left end of the delivery pipe (3) on the left side. A third PLC controller (514) is arranged on the right side of the top of the anaerobic tank (2). The output end of the anaerobic pH sensor (511) is electrically connected to the input end of the third PLC controller (514), and the output end of the third PLC controller (514) is electrically connected to the alarm (512) and the input end of the feed pump (513).

4. The automatic control system for anaerobic fermentation of kitchen waste according to claim 3, characterized in that: The liquid level control unit (52) comprises a liquid level meter (521), which is arranged on the top of the buffer tank (1); a solenoid valve (522) is arranged on the surface of the feeding pipe (8); a second PLC controller (523) is arranged on the right side of the buffer tank (1); the output end of the liquid level meter (521) is electrically connected to the input end of the second PLC controller (523); and the output end of the second PLC controller (523) is electrically connected to the input end of the solenoid valve (522) and the feed pump (513).

5. The automatic control system for anaerobic fermentation of kitchen waste according to claim 2, characterized in that: The temperature control unit (53) includes a first temperature sensor (531), which is arranged on the left side of the top of the inner cavity of the anaerobic tank (2). A second temperature sensor (532) is arranged on the upper end of the front of the hot water tank (4). A hot water pump (533) is arranged on the left side of the hot water tank (4). The water inlet end of the hot water pump (533) is fixedly connected to the hot water tank (4), and the water outlet end of the hot water pump (533) is fixedly connected to the right end of the delivery pipe (3) on the right side. The anaerobic tank The inner cavity of (2) is provided with a shell and tube heat exchanger (534), the surface of the heating tube (9) is provided with a steam valve (535), the lower end of the front of the hot water tank (4) is provided with a first PLC controller (536), the output ends of the first temperature sensor (531) and the second temperature sensor (532) are both electrically connected to the input end of the first PLC controller (536), and the output end of the first PLC controller (536) is electrically connected to the input end of the hot water pump (533) and the steam valve (535).

6. The automatic control system for anaerobic fermentation of kitchen waste according to claim 3, characterized in that: The monitoring alarm unit (54) comprises an ORP electrode (541), the ORP electrode (541) being arranged on the right side of the inner cavity of the anaerobic tank (2), and a combustible gas detector (542) being arranged on the left side of the anaerobic tank (2), the output ends of the ORP electrode (541) and the combustible gas detector (542) being electrically connected to the input end of a third PLC controller (514), and the output end of the third PLC controller (514) being electrically connected to the input end of the alarm (512).

7. The automatic control system for anaerobic fermentation of kitchen waste according to claim 2, characterized in that: The biogas monitoring unit (55) comprises a gas-sensitive resistor (551), a central processing unit (552) and a display screen (553). The gas-sensitive resistor (551) is arranged on the right side of the inner cavity of the anaerobic tank (2). The output end of the gas-sensitive resistor (551) is electrically connected to the input end of the central processing unit (552), and the output end of the central processing unit (552) is electrically connected to the input end of the display screen (553).

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