WO2019179406A1

WO2019179406A1 - Parameter monitoring device and design method for internal immersed anaerobic fermentation tank

Info

Publication number: WO2019179406A1
Application number: PCT/CN2019/078590
Authority: WO
Inventors: 周宇光; 牟华伟; 张森清; 陈志斌; 董仁杰
Original assignee: 中国农业大学
Priority date: 2018-03-19
Filing date: 2019-03-19
Publication date: 2019-09-26
Also published as: CN108531389A

Abstract

The present invention provides a parameter monitoring device and a design method for an internal immersed anaerobic fermentation tank, the device comprising a motor, a housing, a sensor group, a power source, a main controller, and a ball screw. The motor is provided outside of the anaerobic fermentation tank, and an output shaft of the motor is connected, by means of a coupling, to one end shaft of the ball screw which is provided within the anaerobic fermentation tank, and the other end of the ball screw is connected at the base of the anaerobic fermentation tank by means of a bolt. The housing is provided on the ball screw, and the sensor group, the power source and the main controller are provided within the housing for monitoring the parameters of the anaerobic fermentation liquid. The sensor group is provided on a side wall of the housing and transmits the monitored parameter information to the main controller, the power source and the main controller are located within the center of the housing, and the main controller and the sensor group are powered by the power source. The rotation of the motor is controlled by the main controller.

Description

Internal immersion anaerobic fermentation tank parameter monitoring device and design method

Technical field

The invention relates to a parameter monitoring device and a design method, in particular to an internal immersion anaerobic fermentation tank parameter monitoring device and a design method thereof.

Background technique

With the increasing attention of the country on energy issues and environmental issues, renewable energy technologies and utilization have developed rapidly. The biogas projects used to treat livestock and poultry manure, kitchen waste, and domestic sewage have received widespread attention. The main function of the biogas project is to treat waste and produce biogas to provide energy. The biogas project includes: feed tank, anaerobic fermentation tank, solid-liquid separator, biogas storage tank, condensate, desulfurization tower, gas storage tank, etc. The biogas project needs to be operated under the conditions of suitable temperature, pressure and pH. The operation of the biogas project is reflected in the gas production and gas composition. In order to realize the long-term stable operation of the biogas project, the biogas project operating parameters are collected in real time through sensors, and the data is stored and monitored online through the equipment network.

At present, most of the sensors are fixedly installed outside the anaerobic fermentation tank, but the fermenter is a large confined space. In order to better grasp the internal fermentation situation, it is proposed to bring the sensor of the online monitoring system into the system by using the internal immersion parameter monitoring device. The inside of the fermenter is monitored for movement.

Summary of the invention

In view of the above problems, the object of the present invention is to provide an internal immersion anaerobic fermentation tank parameter monitoring device and a design method thereof, which are low in cost, simple in structure, stable in performance, and strong in operability, and are favorable for improving the on-line monitoring level of biogas engineering.

To achieve the above object, the present invention adopts the following technical solutions:

In a first aspect, the present invention provides an internal immersion anaerobic fermentation tank parameter monitoring device, which is disposed in an anaerobic fermentation tank, wherein the anaerobic fermentation tank is provided with a stirring paddle, and the stirring paddle is set and stirred. a stirring shaft connected to the output shaft of the motor, the stirring motor is disposed outside the anaerobic fermentation tank; the device comprises: a motor, a casing, a sensor group, a power source, a main controller and a ball screw; The motor is disposed outside the anaerobic fermenter, and an output shaft thereof is coupled to one end of the ball screw disposed in the anaerobic fermentation tank through a coupling, and the other end of the ball screw is connected by bolts The bottom of the anaerobic fermenter; the casing is disposed on the ball screw, and the sensor group, the power source and the main controller for monitoring parameters of the anaerobic fermentation liquid are disposed in the casing; the sensor a group is disposed on a sidewall of the casing, and transmits the monitored parameter information to the main controller, wherein the power source and the main controller are located in a middle portion of the casing, and the power source is the main control And Sensor set of power supply; rotation of the motor control by the main controller.

Further, the anaerobic fermentation tank is externally provided with a configuration screen; the main controller transmits the received data to the configuration screen via a data line for display control.

Further, the power source uses a lithium battery.

Further, the top of the anaerobic fermenter is provided with a quick charging port for charging the lithium battery, and the quick charging port is close to the ball screw.

Further, the main controller includes a data acquisition single-chip microcomputer and a motion control single-chip microcomputer, and the sensor group transmits the monitored parameter information to the data acquisition single-chip microcomputer, and the data acquisition single-chip microcomputer transmits the received data to the motion control The single chip microcomputer, and the motion control single chip microcomputer controls the rotation of the motor by controlling the stepping motor driver.

Further, the motion control single chip is provided with a GPRS module; the motion control single chip transmits the received parameter information to the existing remote monitoring system through the GPRS module, and realizes remote monitoring of the parameters of the anaerobic fermentation tank.

Further, the sensor group includes a temperature sensor, a pressure sensor, a pH sensor, a CH ₄ concentration sensor, and a CO ₂ concentration sensor; all sensors are evenly arranged on both sidewalls of the housing according to the size and weight of the probe, and each sensor probe One third of the casing is located outside the casing and is in contact with the anaerobic fermentation liquid; an O-ring seal is used between each probe and the casing.

Further, the housing has a rectangular structure and is made of ABS plastic which is resistant to corrosion and pressure.

Further, a gasket and a waterproof sealant are sealed between the lower bottom surface of the casing and the other surfaces.

In a second aspect, the present invention also provides a method for designing an internal immersion anaerobic fermentation tank parameter monitoring device, comprising the following steps: 1) providing a casing, and the casing adopts a rectangular structure; 2) according to the anaerobic fermentation tank Working environment, the shell material is made of ABS plastic with corrosion resistance and pressure resistance; 3) According to the working environment in the anaerobic fermentation tank, the power system of the internal immersion parameter monitoring device is set; the power system includes the ball screw and the motor; It is disposed outside the anaerobic fermentation tank, and its output shaft is connected with one end of the ball screw disposed in the anaerobic fermentation tank, and the other end of the ball screw is bolted to the bottom of the anaerobic fermentation tank; the casing is disposed on the ball screw Driven by the motor, reciprocate up and down along the ball screw; 4) According to the monitoring object and preset parameter requirements, select the sensor and install it inside the housing, one third of the sensor probe is located outside the housing, and The anaerobic fermentation liquid contacts and sets an online monitoring system; the online monitoring system includes a main controller disposed in the casing; each sensor transmits the monitored anaerobic fermentation liquid parameters to the main The controller is transmitted from the main controller to the configuration screen disposed outside the anaerobic fermentation tank; the main controller includes a data acquisition single chip microcomputer and a motion control single chip microcomputer, and the data acquisition single chip microcomputer transmits the received sensor monitoring data to the motion control single chip microcomputer. The motion control single chip microcomputer is used to control the rotation of the motor; 5) the power source is a lithium battery, and the power source is set in the casing to supply power to the main controller and the sensor; 6) between the sensor probe and the casing, and the casing itself The sealing method is selected between the structures: the structure of the shell itself is sealed by a gasket and a waterproof sealant, and an O-ring seal is used between each probe and the casing.

The invention adopts the above technical solutions, and has the following advantages: 1. The invention can obtain the real-time temperature, pressure, pH value, CH ₄ and CO ₂ concentration of the fermentation liquid directly in the fermenter without sampling, real-time online monitoring is realized. At the same time, the biogas project can be quickly adjusted according to the obtained parameter values to reduce the outage of the biogas project due to the lack of timely feedback. 2. The shape of the invention adopts a rectangular shape to facilitate the up and down movement of the internal immersion parameter monitoring device, and the ABS plastic material of the outer casing material can reduce the cost, and the internal immersion of the fermenter internal material liquid requires a fixed position to reduce the internal immersion. Collision between the parameter monitoring device and the tank wall and the agitator. 3. The invention integrates different monitoring parameters together, that is, obtains different parameters at the same time, and the monitoring is more time-sensitive. 4. The invention selects a lithium battery to supply power to the internal sensor of the internal immersion parameter monitoring device, and can repeatedly charge multiple times and reduce the weight. 5. The invention seals the device and effectively increases the sealing effect of the internal immersion parameter monitoring device. 6. The invention has the advantages of low cost, simple structure, stable performance and strong operability, and is favorable for improving the online monitoring level of the biogas project.

DRAWINGS

Figure 1 is a schematic view showing the structure of the apparatus of the present invention;

2 is a schematic diagram of an online monitoring structure of the present invention;

3 is a flow chart showing the method of designing a device of the present invention.

detailed description

The invention will now be described in detail in conjunction with the drawings and embodiments.

As shown in FIG. 1 , the present invention provides an internal immersion anaerobic fermentation tank parameter monitoring device, which is disposed in an anaerobic fermentation tank 1 , and an anaerobic fermentation tank 1 is provided with a stirring paddle 2 , and the stirring paddle 2 is disposed at The stirring shaft connected to the output shaft of the stirring motor 3 is driven by the stirring motor 3; the stirring motor 3 is disposed outside the anaerobic fermentation tank 1. The apparatus of the present invention includes a motor 4, a ball screw 5, a housing 6, a sensor group 7, a power source 8, and a main controller 9. The motor 4 is disposed outside the anaerobic fermentation tank 1, and its output shaft is coupled to one end of the ball screw 5 disposed in the anaerobic fermentation tank 1 through a coupling, and the other end of the ball screw 5 is bolted to the anaerobic fermentation tank. 1 bottom, and the ball screw 5 is arranged in parallel with the stirring shaft. The housing 6 is disposed on the ball screw 5, and the housing 6 is provided with a sensor group 7 for monitoring anaerobic fermentation liquid parameters, a power source 8 and a main controller 9; the sensor group 7 is disposed on the side wall of the housing 6, The monitored parameter information is transmitted to the main controller 9, and the power source 8 and the main controller 9 are located in the middle of the casing 6, and the power source 8 supplies power to the main controller 9 and the sensor group 7. The motor 4 is controlled by the main controller 9 to rotate, thereby driving the housing 6 disposed on the ball screw 5 to move up and down along the ball screw 5, and effectively avoiding the left and right swing of the housing 6 and the anaerobic fermentation liquid. Drifting.

In the above embodiment, the configuration screen 10 is also disposed outside the anaerobic fermentation tank 1. The main controller 9 transmits the received data to the configuration screen 10 via the data line for display control. Among them, the data line can use RS232 data line.

In the above embodiments, the power source 8 is a lithium battery. At the top of the anaerobic fermentation tank 1, there is also provided a quick charging port which is close to the ball screw 5; when the casing 6 is moved to the top of the anaerobic fermentation tank 1, the lithium battery can be periodically charged.

In the above embodiments, the main controller 9 includes a data acquisition single-chip microcomputer and a motion control single-chip microcomputer, and both of the single-chip microcomputers adopt a single-chip microcomputer of the type STM32F103C8T6. The sensor group transmits the monitored parameter information to the data acquisition single-chip microcomputer, and RS485 communication is adopted between the sensor group and the data acquisition single-chip microcomputer, and the communication protocol adopts Modbus-RTU. The data acquisition MCU transmits the received data to the motion control MCU. The 433M wireless module is used for signal transmission between the two MCUs. The motion control MCU controls the rotation of the motor 4 by controlling the stepper motor driver, and simultaneously realizes data acquisition and motion control. Function (as shown in Figure 2).

Among them, a GPRS module is also arranged on the motion control single-chip microcomputer; the motion control single-chip transmits the received parameter information to the existing remote monitoring system through the GPRS module, thereby realizing the monitoring of the parameters of the anaerobic fermentation tank.

In each of the above embodiments, the sensor group 7 includes a temperature sensor, a pressure sensor, a pH sensor, a CH ₄ concentration sensor, and a CO ₂ concentration sensor. All sensors are evenly arranged on both side walls of the housing 6 according to their probe size and weight, and one third of each sensor probe is located outside the housing 6, in contact with the anaerobic fermentation liquid, and between each probe and the housing 6 O-ring seal.

In the above embodiments, the housing 6 has a rectangular structure, and the lower bottom surface and the other surfaces are sealed by a gasket and a waterproof sealant. The housing 6 is made of ABS plastic which is resistant to corrosion and pressure.

As shown in FIG. 3, the present invention also provides a method for designing an internal immersion anaerobic fermentation tank parameter monitoring device, which comprises the following steps:

1) providing a housing 6 and selecting a housing 6 shape;

The housing 6 adopts a rectangular structure; since the internal immersion parameter monitoring device works in the anaerobic fermentation liquid, each monitoring component needs to be installed inside the casing 6 under the premise of ensuring the sealing, in order to facilitate installation and reduce the internal immersion parameters. When the monitoring device moves up and down to reduce energy consumption, a rectangular structure is selected.

2) selecting the material of the casing 6 according to the working environment in the anaerobic fermentation tank 1;

The housing 6 is made of corrosion-resistant and pressure-resistant ABS plastic;

The choice of materials should first consider the working environment, followed by the cost, the difficulty of processing, etc. The working conditions of the internal immersion parameter monitoring device are relatively harsh. The raw materials of the anaerobic fermentation liquid are generally livestock manure, kitchen waste, domestic waste, etc. It has strong corrosiveness and high turbidity. It contains solid materials. Therefore, first select corrosion-resistant materials, such as plastics, stainless steel, and plexiglass. Considering factors such as difficulty in processing, high cost, and good transmission signal, it is chosen. ABS plastic that is easy to process, low in cost, and does not interfere with signals.

3) setting a power system of the internal immersion parameter monitoring device according to the working environment in the anaerobic fermentation tank 1;

The power system includes a ball screw 5 and a motor 4; the motor 4 is disposed outside the anaerobic fermentation tank 1, and its output shaft is axially coupled to one end of the ball screw 5 disposed in the anaerobic fermentation tank 1, and the other end of the ball screw 5 is passed The bolt is connected to the bottom of the anaerobic fermentation tank 1; the casing 6 is disposed on the ball screw 5, and is driven up and down along the ball screw 5 under the driving of the motor 4, without left and right sway and wandering in the anaerobic fermentation liquid. ;

The moving position of the housing 6 is fixed by the ball screw 9. Since most of the biogas engineering requires agitation, the anaerobic fermentation liquid is flowing. If the casing 6 of the internal immersion parameter monitoring device is not fixed, the casing 6 may be damaged by contact with the agitator.

4) According to the monitoring object and the preset parameter requirements, the sensor is selected and installed inside the casing 6, one third of the sensor probe is located outside the casing 6, is in contact with the anaerobic fermentation liquid, and an online monitoring system is set;

The online monitoring system includes a main controller 9 disposed in the housing 6; each sensor transmits the monitored anaerobic fermentation liquid parameters to the main controller 9 and is transmitted by the main controller 9 to be disposed outside the anaerobic fermentation tank 1 The configuration screen 10 performs on-site monitoring; the main controller 9 includes a data acquisition single-chip microcomputer and a motion control single-chip microcomputer, and the data acquisition single-chip microcomputer transmits the received sensor monitoring data to the motion control single-chip microcomputer, and the motion control single-chip microcomputer controls the motor by controlling the stepping motor driver. 4 rotation.

5) selecting a power source and setting the power source in the housing 6;

The power supply uses a lithium battery to supply power to the main controller 9 and the sensor;

The main types of batteries are zinc-manganese battery, hydrogen-nickel battery, lithium battery and lead-acid battery. The advantages and disadvantages are: zinc-manganese battery is cheap, self-discharge is small, but internal resistance is large, current is small; hydrogen nickel battery is versatile and current Large, environmentally stable, but short battery life, not full of saturating; lithium battery has no memory effect, light weight, rechargeable, but high cost, low current, not over-filled; lead-acid battery capacity, Rechargeable, but bulky. Because it is a built-in device, it is necessary to consider the battery volume and charge and discharge problems, so choose a nickel-hydrogen battery or a lithium battery; because the internal current of the internal immersion parameter monitoring device is small, it is necessary to consider the battery life and current, so choose Lithium battery or zinc-manganese battery, so consider the choice of lithium battery.

6) Select a sealing method between the sensor probe and the housing 6, and the structure of the housing 6 itself to ensure the sealing: the housing 6 itself is sealed with a gasket and a waterproof sealant, and each probe and housing O-ring seals are used between 6.

In the above step 4), the sensor comprises a temperature sensor, a pressure sensor, a pH sensor, a CH ₄ concentration sensor and a CO ₂ concentration sensor, which are distributed on both sides of the housing 6 according to the size and weight of the sensor probe.

The above embodiments are merely illustrative of the present invention, and the structure, size, arrangement position and shape of each component may be varied. On the basis of the technical solution of the present invention, improvements are made to individual components according to the principles of the present invention. And equivalent transformations should not be excluded from the scope of protection of the present invention.

Claims

An internal immersed anaerobic fermenter parameter monitoring device is disposed in an anaerobic fermentation tank, wherein the anaerobic fermenter is provided with a stirring paddle, and the stirring paddle is disposed at a stirring connected to an output shaft of the stirring motor On the shaft, the stirring motor is disposed outside the anaerobic fermentation tank; the device comprises: a motor, a casing, a sensor group, a power source, a main controller and a ball screw; the motor is disposed in the anatomy Outside the oxygen fermenter, an output shaft thereof is coupled to one end of the ball screw disposed in the anaerobic fermentor through a coupling, and the other end of the ball screw is connected to the bottom of the anaerobic fermentor by bolting Providing the housing on the ball screw, the sensor group, the power source and the main controller for monitoring parameters of the anaerobic fermentation liquid are disposed in the housing; the sensor group is disposed in the housing Transmitting the monitored parameter information to the main controller, the power source and the main controller are located in a middle portion of the casing, and the main controller and the sensor group are powered by the power source; Electric Its rotation is controlled by the master controller.
The apparatus according to claim 1, wherein said anaerobic fermentor is externally provided with a configuration screen; said main controller transmits the received data to said configuration screen via a data line for display control.
The device of claim 1 wherein said power source is a lithium battery.
The apparatus according to claim 3, wherein said anaerobic fermentor top is provided with a quick charging port for charging said lithium battery, said quick charging port being adjacent to said ball screw.
The apparatus of claim 1 wherein said main controller comprises a data acquisition microcontroller and a motion control microcontroller, said sensor group transmitting the monitored parameter information to said data acquisition microcontroller, said data acquisition microcontroller The received data is transmitted to the motion control microcontroller, and the motion control microcontroller controls the rotation of the motor by controlling the stepper motor driver.
The apparatus according to claim 5, wherein: said motion control microcontroller is provided with a GPRS module; said motion control microcontroller transmits the received parameter information to the existing remote monitoring system through the GPRS module, thereby implementing anaerobic Remote monitoring of fermenter parameters.
The apparatus according to claim 1, wherein said sensor group comprises a temperature sensor, a pressure sensor, a pH sensor, a CH 4 concentration sensor, and a CO 2 concentration sensor; all of the sensors are uniformly disposed in said case according to a probe size and weight thereof The two side walls of the body, and one third of each sensor probe is located outside the casing, in contact with the anaerobic fermentation liquid; an O-ring seal is used between each probe and the casing.
The apparatus according to claim 1, wherein said casing has a rectangular structure and is made of corrosion-resistant and pressure-resistant ABS plastic.
The device according to claim 8, wherein the lower surface of the casing and the other faces are sealed by a gasket and a waterproof sealant.
The invention relates to a method for designing an internal immersed anaerobic fermenter parameter monitoring device, which comprises the following steps:

1) providing a casing, and the casing adopts a rectangular structure;

2) According to the working environment in the anaerobic fermentation tank, the shell material is made of ABS plastic which is resistant to corrosion and pressure;

3) setting the power system of the internal immersion parameter monitoring device according to the working environment in the anaerobic fermentation tank;

The power system includes a ball screw and a motor; the motor is disposed outside the anaerobic fermenter, and the output shaft is coupled to one end of the ball screw disposed in the anaerobic fermentor, and the other end of the ball screw is bolted to the anaerobic fermentor a bottom; the housing is disposed on the ball screw, and is driven up and down along the ball screw under the driving of the motor;

4) According to the monitoring object and the preset parameter requirements, the sensor is selected and installed inside the casing, one third of the sensor probe is located outside the casing, is in contact with the anaerobic fermentation liquid, and an online monitoring system is set;

The online monitoring system comprises a main controller disposed in the housing; each sensor transmits the monitored anaerobic fermentation liquid parameters to the main controller, and is transmitted by the main controller to a configuration screen disposed outside the anaerobic fermentation tank; The controller comprises a data acquisition single-chip microcomputer and a motion control single-chip microcomputer, and the data acquisition single-chip microcomputer transmits the received sensor monitoring data to the motion control single-chip microcomputer, and the motion control single-chip microcomputer is used for controlling the rotation of the motor;

5) Select the power source as a lithium battery, and set the power supply in the housing to supply power to the main controller and the sensor;

6) Select the sealing method between the sensor probe and the housing, and the structure of the housing itself: the structure of the housing itself is sealed with a waterproof sealant, and the O-ring seal is used between each probe and the housing.