CN109136083B - Anaerobic digestion process on-line monitoring system - Google Patents
Anaerobic digestion process on-line monitoring system Download PDFInfo
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- CN109136083B CN109136083B CN201811068308.4A CN201811068308A CN109136083B CN 109136083 B CN109136083 B CN 109136083B CN 201811068308 A CN201811068308 A CN 201811068308A CN 109136083 B CN109136083 B CN 109136083B
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- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/02—Form or structure of the vessel
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
- C12M27/02—Stirrer or mobile mixing elements
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
- C12M41/18—Heat exchange systems, e.g. heat jackets or outer envelopes
Abstract
The invention relates to an anaerobic digestion process on-line monitoring system, which is characterized by comprising an anaerobic digestion reactor, an anaerobic digestion circulation loop system, an on-line monitoring device, a circulating heating device and a control system, wherein the anaerobic digestion reactor is connected with the on-line monitoring device; a stirring device is arranged in the anaerobic digestion reactor; the anaerobic digestion reactor is provided with a feed inlet and a discharge outlet, the heat insulation layer of the anaerobic digestion reactor is provided with a water inlet and a water outlet, and the discharge outlet of the anaerobic digestion reactor is connected with an online monitoring device through an anaerobic digestion circulation loop system; the water outlet and the water inlet of the anaerobic digestion reactor are respectively connected with a circulating heating device; the top of the anaerobic digestion reactor is provided with a motor, and the top of the stirring device is fixedly connected with the output end of the motor; a first temperature sensor is also inserted and fixed in the anaerobic digestion reactor; the motor, the anaerobic digestion circulation loop system and the first temperature sensor are respectively and electrically connected with the control system, and the invention can be widely applied to the technical field of biochemical reaction.
Description
Technical Field
The invention relates to an anaerobic digestion process on-line monitoring system, and belongs to the technical field of biochemical reactions.
Background
About 39 million tons of livestock and poultry manure, about 7 million tons of crop straws and about 6 million tons of other wastes are produced in China every year, which brings about serious environmental problems. Anaerobic digestion has become one of the effective solutions as a biodegradation and biogas production technology. The anaerobic digestion technology is utilized to treat the organic waste, on one hand, the environmental problems of cities and rural areas are solved, on the other hand, the problem of energy shortage in China at present is relieved to a certain extent, and the anaerobic digestion technology has important significance for the sustainable development of ecology and economy.
Anaerobic digestion is a biochemical reaction carried out under anaerobic conditions, anaerobic bacteria decompose organic matters to generate biogas, and a fermentation reaction is a complex biochemical process and comprises three stages of hydrolysis, acidification and methane generation, wherein corresponding microorganisms participate in the reaction in each stage. The bacteria participating in the reaction are mainly divided into fermentative bacteria, hydrogen-producing acetogenic bacteria, hydrogen-consuming acetogenic bacteria, methanogenic bacteria and methanogenic bacteria. Anaerobic microorganisms are sensitive to high organic load and external disturbance, especially methanogens have strict requirements on environmental conditions, and when the water inlet load is suddenly increased or the water temperature and alkalinity are too low, the hydrolysis acidification process and the methanation process are easily unbalanced, so that a large amount of organic acid is accumulated, anaerobic methanation is inhibited, and even the operation of a reactor fails. Therefore, the anaerobic digestion process is reasonably monitored in real time, the key parameters of the process are timely adjusted, the anaerobic digestion process can be stably and efficiently carried out with low energy consumption, and high methane yield is obtained.
The research on anaerobic digestion in the prior art mainly focuses on monitoring of conventional industrial indexes such as temperature, pH and the like, the requirements can be met by using a conventional sensor generally, and the requirements of on-line monitoring cannot be met by using an off-line method for measuring more important intermediate products such as volatile fatty acid and the like by combining with related instruments such as a gas chromatograph and the like. Researchers adopt a hyperspectral technology to monitor the content of solid matters in fermentation liquor in an off-line manner; related researches also directly place the near infrared probe on the outer wall of the glass of the reaction tank body, so that the change of the ethanol content in the fermentation process can be monitored on line; the near-infrared probe is arranged on an external pipeline, the spectral information of the fermentation liquor is obtained, and the content of volatile fatty acid, acetic acid and propionic acid can be predicted by establishing a model. The researcher also builds an external circulation pipeline, has functions such as sampling, collection spectrum, can real-time supervision glycerine. However, the existing anaerobic digestion monitoring system generally only focuses on monitoring anaerobic digestion industrial parameters (temperature, pH and the like) and cannot accurately reflect the state of anaerobic digestion; in addition, the research direction of the existing anaerobic digestion monitoring system is off-line research, the anaerobic digestion process cannot be monitored in real time, and a plurality of key parameters (acetic acid, isobutyric acid, butyric acid, isovaleric acid, valeric acid and the like) of anaerobic digestion cannot be obtained simultaneously.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide an anaerobic digestion process on-line monitoring system that can accurately reflect the anaerobic digestion status.
In order to achieve the purpose, the invention adopts the following technical scheme: an anaerobic digestion process on-line monitoring system is characterized by comprising an anaerobic digestion reactor, an anaerobic digestion circulation loop system, an on-line monitoring device, a circulation heating device and a control system, wherein a heat insulation layer is arranged in the anaerobic digestion reactor; a stirring device is arranged in the anaerobic digestion reactor; the anaerobic digestion reactor is provided with a feed inlet and a discharge outlet, the heat insulation layer of the anaerobic digestion reactor is provided with a water inlet and a water outlet, and the discharge outlet of the anaerobic digestion reactor is connected with the online monitoring device through the anaerobic digestion circulation loop system; the water outlet and the water inlet of the anaerobic digestion reactor are respectively connected with the circulating heating device; the top of the anaerobic digestion reactor is provided with a motor, and the top of the stirring device is fixedly connected with the output end of the motor; a first temperature sensor which is fixedly inserted in the anaerobic digestion reactor and used for collecting the temperature of the fermentation liquor in the anaerobic digestion reactor in real time; the motor, the anaerobic digestion circulation loop system and the first temperature sensor are also respectively and electrically connected with the control system.
Further, the anaerobic digestion circulation loop system comprises a Y-shaped filter, a liquid storage tank, an air filter and a fan; anaerobic digestion reactor's discharge gate pass through the screw valve with Y type filter through first valve parallel connection second valve export, third valve export, fourth valve import and the on-line monitoring device import, second valve access connection external water source, the export of fourth valve is the sample connection, on-line monitoring device exit linkage the liquid storage pot import, the liquid storage pot export is through fifth valve parallel connection air cleaner and fan, air cleaner's import department still is provided with the sixth valve, the third valve import through seventh valve parallel connection eighth valve with the fan.
Further, the online monitoring device comprises a polyformaldehyde mechanism, a first fixing device, a second fixing device, a reflecting plate, first quartz stone glass, second quartz stone glass and a near-infrared spectrometer; the polyformaldehyde mechanism is formed by fixedly connecting an upper polyformaldehyde mechanism with a lower polyformaldehyde mechanism, the upper polyformaldehyde mechanism and the lower polyformaldehyde mechanism are respectively formed by inserting and fixing a second polyformaldehyde plate in the center of a first polyformaldehyde plate, a channel for circulating fermentation liquor is arranged between the upper polyformaldehyde mechanism and the lower polyformaldehyde mechanism, and two ends of the channel are respectively provided with an interface for connecting a pipeline of the anaerobic digestion circulation loop system; the center of the upper polyformaldehyde mechanism is inserted and fixed with the first fixing device, and the center of the lower polyformaldehyde mechanism is inserted and fixed with the second fixing device; the near-infrared spectrometer is characterized in that the bottom of the first fixing device is sequentially provided with the reflecting plate and first quartz stone glass, the second fixing device is internally provided with the near-infrared spectrometer, and the second quartz stone glass is arranged above the near-infrared spectrometer.
Furthermore, the reflecting plate is made of polytetrafluoroethylene materials.
Further, the circulating heating device comprises a heating cabinet and a control device, wherein a heating wire, a second temperature sensor, a water tank and a peristaltic pump are arranged in the heating cabinet; the heating wire is arranged in the water tank, the water inlet of the water tank is connected with the water outlet of the heat-insulating layer of the anaerobic digestion reactor, and the water outlet of the water tank is connected with the water inlet of the heat-insulating layer of the anaerobic digestion reactor through the peristaltic pump; the control device is respectively and electrically connected with the heating wires, the second temperature sensor and the peristaltic pump, and is used for heating water in the water tank through the heating wires according to preset temperature and the temperature in the water tank collected by the second temperature sensor in real time.
Further, the on-line monitoring system also comprises a support, wherein universal wheels are arranged at the bottom of the support, and the anaerobic digestion reactor is arranged on the support.
Further, the control system comprises an intermittent or continuous setting button, a fan button, a speed regulating knob, a starting or emergency stopping button, a setting panel, a display panel and a controller; the controller is respectively and electrically connected with the motor, the fan, the first temperature sensor, the intermittent or continuous setting button, the fan button, the speed regulating knob, the starting or emergency stopping button, the setting panel and the display panel; the controller is used for presetting different time intervals of the motor through the setting panel; the intermittent state or the continuous state of the motor is controlled by the intermittent or continuous setting button according to preset different time intervals of the motor; the fan button is used for controlling the on or off of the fan; the speed regulating knob is used for controlling the rotating speed of the motor and the fan; the starting or stopping of each electric component is controlled by the starting or emergency stopping button; and the display panel is used for displaying the temperature information of the fermentation liquor in the anaerobic digestion reactor, which is acquired by the first temperature sensor, in real time.
Furthermore, the anaerobic digestion reactor is made of borosilicate glass materials, and a double-layer water bath heat insulation layer is arranged in the anaerobic digestion reactor.
Further, a gas collecting port is formed in the anaerobic digestion reactor.
Further, the stirring device comprises a stirring shaft, the top of the stirring shaft is connected with the output end of the motor, and two stirring blades are symmetrically arranged at the bottom of the stirring shaft.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the anaerobic digestion circulation loop system is adopted, so that fermentation liquor in the anaerobic digestion reactor is effectively led out in time, and meanwhile, the anaerobic digestion circulation loop system has the functions of cleaning and drying, can clean pipelines in time after one experiment, and does not influence the next experiment. 2. The on-line monitoring device adopts the infrared near-infrared spectrometer to monitor the anaerobic digestion process on line in real time, can monitor a plurality of fermentation key parameters of fermentation liquor simultaneously, and overcomes the defect that the traditional sensor can only measure a single parameter. 3. The anaerobic digestion reactor adopts a double-layer heat-insulating structure, and simultaneously adopts a water bath heating mode, so that the anaerobic digestion reactor is intelligently controlled to be at an ideal temperature and is kept in a constant temperature state, and the anaerobic digestion process is operated in a stable and efficient state. 4. The invention provides a vacuum pumping material guiding mode, the anaerobic digestion circulation loop system can be connected with an external fan, before the experiment is carried out, the whole bypass pipeline is pumped into a vacuum state, the pipeline is in a negative pressure state, and the fermentation liquor is guided to an online monitoring device. The system can be widely applied to the technical field of biochemical reaction.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the monitoring system of the present invention;
FIG. 2 is a schematic diagram of the configuration of the anaerobic digestion recirculation loop system of the monitoring system of the present invention;
fig. 3 is a schematic structural diagram of an on-line monitoring device in the monitoring system of the present invention.
Detailed Description
The present invention is described in detail below with reference to the attached drawings. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the system for monitoring the anaerobic digestion process on line provided by the invention comprises a bracket 1, an anaerobic digestion reactor 2, a motor 3, a stirring shaft 4, an anaerobic digestion circulation loop system 5, an on-line monitoring device 6, a circulation heating device 7, a first temperature sensor 8 and a control system 9, wherein a double-layer water bath heat insulation layer is arranged in the anaerobic digestion reactor 2.
The bottom of the bracket 1 is provided with a universal wheel 101, and the bracket 1 is provided with an anaerobic digestion reactor 2. The top of the anaerobic digestion reactor 2 is provided with a motor 3, a stirring shaft 4 is longitudinally arranged in the anaerobic digestion reactor 2, the top of the stirring shaft 4 is fixedly connected with the output end of the motor 3, and the bottom of the stirring shaft 4 is provided with a stirring blade 401. The top of the anaerobic digestion reactor 2 is provided with a feeding hole 201 and a gas collecting hole 202, the bottom of the anaerobic digestion reactor 2 is provided with a discharging hole 203, the discharging hole 203 of the anaerobic digestion reactor 2 is connected with an online monitoring device 6 through an anaerobic digestion circulation loop system 5 by a spiral valve 204, the anaerobic digestion circulation loop system 5 transmits fermentation liquor in the anaerobic digestion reactor 2 to the online monitoring device 6, and the online monitoring device 6 is used for monitoring spectral information of the fermentation liquor in the anaerobic digestion reactor 2 in real time. An upper water outlet 205 and a lower water inlet 206 at the double-layer water bath insulating layer of the anaerobic digestion reactor 2 are respectively connected to the circulating heating device 7 through rubber hoses 207, and the circulating heating device 7 is used for circularly heating the fermentation liquor in the anaerobic digestion reactor 2. A first temperature sensor 8 is also inserted and fixed in the anaerobic digestion reactor 2 and used for collecting the temperature of the fermentation liquor in the anaerobic digestion reactor 2 in real time.
The motor 3, the anaerobic digestion circulation loop system 5 and the first temperature sensor 8 are also respectively and electrically connected with a control system 9.
As shown in fig. 2, the anaerobic digestion circulation loop system 5 includes a Y-shaped filter 501, first to eighth valves 502 to 509, a liquid storage tank 510, an air filter 511 and a blower 512, wherein the first to eighth valves 502 to 509 all adopt manual ball valves, and each pipeline in the anaerobic digestion circulation loop system 5 adopts stainless steel material. The discharge port 203 of the anaerobic digestion reactor 2 is connected in parallel with the outlet of a second valve 503, the outlet of a third valve 504, the inlet of a fourth valve 505 and the inlet of an online monitoring device 6 through a first valve 502 by a spiral valve 204 and a Y-shaped filter 501, the inlet of the second valve 503 is connected with an external water source, the outlet of the fourth valve 505 is a sampling port 513, the outlet of the online monitoring device 6 is connected with the inlet of a liquid storage tank 510, the outlet of the liquid storage tank 510 is connected in parallel with an air filter 511 and a fan 512 by a fifth valve 506, and the inlet of the air filter 511 is also provided with a sixth valve 507. The inlet of the third valve 504 is connected in parallel to an eighth valve 509 and a fan 512 via a seventh valve 508.
As shown in fig. 3, the online monitoring device 6 includes a polyoxymethylene mechanism 601, a first fixing device 602, a second fixing device 603, a reflector 604, a first quartz glass 605, a second quartz glass 606, and a near-infrared spectrometer 607, wherein the polyoxymethylene mechanism 601 includes an upper polyoxymethylene mechanism 608 and a lower polyoxymethylene mechanism 609, the upper polyoxymethylene mechanism 608 and the lower polyoxymethylene mechanism 609 both include a first polyoxymethylene plate 610 and a second polyoxymethylene plate 611, each first polyoxymethylene plate 610 has a plate-shaped structure with a through hole at the center, and each second polyoxymethylene plate 611 has a cylindrical structure.
The center of each first polyformaldehyde plate 610 is fixedly connected with a corresponding second polyformaldehyde plate 611 through a bolt 612 to form a corresponding upper polyformaldehyde mechanism 608 and a corresponding lower polyformaldehyde mechanism 609, the upper polyformaldehyde mechanism 608 is fixedly connected with the lower polyformaldehyde mechanism 609 through a bolt (not shown in the figure) to form a polyformaldehyde mechanism 601, a channel 613 for circulating fermentation liquor is arranged between the upper polyformaldehyde mechanism 608 and the lower polyformaldehyde mechanism 609, and two ends of the channel 613 are respectively provided with a connector 614 for connecting a pipeline of the anaerobic digestion circulation loop system 5. The center of the upper polyoxymethylene mechanism 608 is inserted and fixed with the first fixing device 602, and the center of the lower polyoxymethylene mechanism 609 is inserted and fixed with the second fixing device 603. The bottom of the first fixing device 602 is sequentially provided with a reflecting plate 604 and first quartz stone glass 605, the second fixing device 603 is internally provided with a near-infrared spectrometer 607, the second quartz stone glass 606 is arranged above the near-infrared spectrometer 607, and the near-infrared spectrometer 607 is used for emitting near-infrared light and collecting near-infrared spectrum information of fermentation liquor after being reflected by the fermentation liquor and reflected by the reflecting plate 604. The first fixture 602 and the second fixture 603 are each provided with an annular groove 615 for facilitating manual operation. The near infrared spectrometer 607 is also electrically connected to an external computer, and the collected spectral information is stored in the computer.
In a preferred embodiment, the circulation heating device 7 comprises a heating cabinet 701 and a control device 702, wherein the control device 702 adopts a single chip microcomputer to realize intelligent temperature control. The heating cabinet 701 is fixedly connected with the control device 702 on one side, a heating wire, a second temperature sensor, a water tank and a peristaltic pump are arranged in the heating cabinet 701, the heating wire is arranged in the water tank, the water inlet of the water tank is connected with the water outlet 205 at the double-layer water bath heat preservation layer of the anaerobic digestion reactor 2, and the water outlet of the water tank is connected with the water inlet 206 at the double-layer water bath heat preservation layer of the anaerobic digestion reactor 2 through a rubber hose by the peristaltic pump. The heating wire, the second temperature sensor and the peristaltic pump are respectively and electrically connected with the control device 702, and the control device 702 is used for heating distilled water in the water tank through the heating wire according to the preset temperature and the temperature in the water tank acquired by the second temperature sensor in real time.
In a preferred embodiment, the control system 9 includes a support stand 901, an intermittent or continuous set button 902, a blower button 903, a speed knob 904, a start or scram button 905, a settings panel 906, a display panel 907, and a controller. An intermittent or continuous setting button 902, a fan button 903, a speed adjusting knob 904, a start or emergency stop button 905, a setting panel 906, a display panel 907 and a controller are arranged on the support stand 901. The controller is respectively and electrically connected with the motor 3, the fan 512, the first temperature sensor 8, the intermittent or continuous setting button 902, the fan button 903, the speed regulating knob 904, the starting or emergency stopping button 905, the setting panel 906 and the display panel 907, and the controller is used for presetting different time intervals of the motor 3 through the setting panel 906; for controlling the intermittent state or continuous state of the motor 3 through the intermittent or continuous setting button 902 according to the preset different time intervals of the motor 3; the fan button 903 is used for controlling the on or off of the fan; the rotating speeds of the motor 3 and the fan are controlled by a speed regulating knob 904; for controlling the start or stop of the electric parts (except the circulating heating device 7) of the invention through a start or emergency stop button 905; and is used for displaying the temperature information of the fermentation liquid in the anaerobic digestion reactor 2 acquired by the first temperature sensor 8 in real time through the display panel 907.
In a preferred embodiment, the anaerobic digestion reactor 2 is made of borosilicate glass material to facilitate observation of the reaction state in the anaerobic digestion reactor 2.
In a preferred embodiment, the bottom of the stirring shaft 4 is symmetrically provided with two stirring blades 401, which can make the fermentation liquid in the anaerobic digestion reactor 2 be evenly distributed in space.
The use of the anaerobic digestion process on-line monitoring system of the present invention is described in detail by the following specific examples:
1) selecting anaerobic digestion raw materials, reasonably proportioning the raw materials and uniformly mixing the raw materials.
2) The uniformly mixed raw materials are fed from a feed port 201 at the top of the anaerobic digestion reactor 2.
3) The operation parameters (the time interval of the intermittent motion of the motor 3) are set through the setting panel 906, and the intermittent or continuous setting button 902 and the speed regulating knob 904 are started, so that the motor 3 is started according to the preset parameters and the regulated rotating speed to carry out anaerobic digestion on the raw materials in the anaerobic digestion reactor 2, and at the moment, the first to eighth valves 502 to 509 in the anaerobic digestion circulation loop system 5 are all closed.
4) Connecting the anaerobic digestion circulation loop system 5 with an external fan, opening or closing a corresponding valve, and simultaneously opening the fan 512 to vacuumize the pipeline in the anaerobic digestion circulation loop system 5 to be in a negative pressure state.
5) The spiral valve 204 and the first valve 502 are opened, the fermentation liquid after anaerobic digestion flows out of the discharge port 203 at the bottom of the anaerobic digestion reactor 2 and enters the flow channel of the on-line monitoring device 6, the near-infrared spectrometer 607 collects the real-time information of the fermentation liquid, and the collected information is transmitted to an external computer for subsequent analysis and management.
6) According to different requirements of experiments, the fourth valve 505 can be opened, and fermentation liquor after anaerobic digestion is taken out from the sampling port 513 of the anaerobic digestion circulation loop system 5 and is refrigerated for subsequent analysis.
7) The liquid storage tank 510 is opened, and the redundant fermentation liquid acquired by the on-line monitoring device 6 in real time can be stored in the liquid storage tank 510.
8) The first valve 502 is closed, the second valve 503 and the liquid storage tank 510 are opened, and external water enters the online monitoring device 6 and the liquid storage tank 510 through the second valve 503 to clean the online monitoring device 6 and the liquid storage tank 510.
9) After cleaning, the second valve 503 is closed, the third valve 504, the sixth valve 507 and the seventh valve 508 are opened, the blower button 903 is opened to start the blower 512, and the hot air blown by the blower 512 dries the anaerobic digestion circulation loop system 5, so as to avoid the adverse effect of the residue of the previous experiment on the next time.
10) After the test is finished, all valves are closed, the biogas residues and the biogas slurry in the anaerobic digestion reactor 2 are taken out, and the whole system is cleaned.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (8)
1. An anaerobic digestion process on-line monitoring system is characterized by comprising an anaerobic digestion reactor, an anaerobic digestion circulation loop system, an on-line monitoring device, a circulation heating device and a control system, wherein a heat insulation layer is arranged in the anaerobic digestion reactor;
a stirring device is arranged in the anaerobic digestion reactor; the anaerobic digestion reactor is provided with a feed inlet and a discharge outlet, the heat insulation layer of the anaerobic digestion reactor is provided with a water inlet and a water outlet, and the discharge outlet of the anaerobic digestion reactor is connected with the online monitoring device through the anaerobic digestion circulation loop system; the water outlet and the water inlet of the anaerobic digestion reactor are respectively connected with the circulating heating device;
the anaerobic digestion circulation loop system comprises a Y-shaped filter, a liquid storage tank, an air filter and a fan;
the discharge port of the anaerobic digestion reactor is connected in parallel with the outlet of a second valve, the outlet of a third valve, the inlet of a fourth valve and the inlet of the online monitoring device through a spiral valve and a Y-shaped filter by a first valve, the inlet of the second valve is connected with an external water source, the outlet of the fourth valve is a sampling port, the outlet of the online monitoring device is connected with the inlet of the liquid storage tank, the outlet of the liquid storage tank is connected in parallel with the air filter and the fan by a fifth valve, the inlet of the air filter is also provided with a sixth valve, and the inlet of the third valve is connected in parallel with an eighth valve and the fan by a seventh valve;
the online monitoring device comprises a polyformaldehyde mechanism, a first fixing device, a second fixing device, a reflecting plate, first quartz stone glass, second quartz stone glass and a near-infrared spectrometer;
the polyformaldehyde mechanism is formed by fixedly connecting an upper polyformaldehyde mechanism with a lower polyformaldehyde mechanism, the upper polyformaldehyde mechanism and the lower polyformaldehyde mechanism are respectively formed by inserting and fixing a second polyformaldehyde plate in the center of a first polyformaldehyde plate, a channel for circulating fermentation liquor is arranged between the upper polyformaldehyde mechanism and the lower polyformaldehyde mechanism, and two ends of the channel are respectively provided with an interface for connecting a pipeline of the anaerobic digestion circulation loop system;
the center of the upper polyformaldehyde mechanism is inserted and fixed with the first fixing device, and the center of the lower polyformaldehyde mechanism is inserted and fixed with the second fixing device; the bottom of the first fixing device is sequentially provided with the reflecting plate and first quartz glass, the second fixing device is internally provided with the near-infrared spectrometer, and the second quartz glass is arranged above the near-infrared spectrometer;
the top of the anaerobic digestion reactor is provided with a motor, and the top of the stirring device is fixedly connected with the output end of the motor; a first temperature sensor which is fixedly inserted in the anaerobic digestion reactor and used for collecting the temperature of the fermentation liquor in the anaerobic digestion reactor in real time;
the motor, the anaerobic digestion circulation loop system and the first temperature sensor are also respectively and electrically connected with the control system.
2. The system for on-line monitoring of anaerobic digestion process according to claim 1, wherein said reflective plate is made of teflon.
3. The on-line monitoring system for the anaerobic digestion process of claim 1, wherein the circulating heating device comprises a heating cabinet and a control device, and a heating wire, a second temperature sensor, a water tank and a peristaltic pump are arranged in the heating cabinet;
the heating wire is arranged in the water tank, the water inlet of the water tank is connected with the water outlet of the heat-insulating layer of the anaerobic digestion reactor, and the water outlet of the water tank is connected with the water inlet of the heat-insulating layer of the anaerobic digestion reactor through the peristaltic pump; the control device is respectively and electrically connected with the heating wires, the second temperature sensor and the peristaltic pump, and is used for heating water in the water tank through the heating wires according to preset temperature and the temperature in the water tank collected by the second temperature sensor in real time.
4. The on-line monitoring system for the anaerobic digestion process of claim 1, further comprising a support, wherein the bottom of the support is provided with universal wheels, and the support is provided with the anaerobic digestion reactor.
5. The on-line monitoring system for anaerobic digestion process of claim 2, wherein the control system comprises an intermittent or continuous setting button, a blower button, a speed-adjusting knob, a start or emergency stop button, a setting panel, a display panel and a controller;
the controller is respectively and electrically connected with the motor, the fan, the first temperature sensor, the intermittent or continuous setting button, the fan button, the speed regulating knob, the starting or emergency stopping button, the setting panel and the display panel;
the controller is used for presetting different time intervals of the motor through the setting panel; the intermittent state or the continuous state of the motor is controlled by the intermittent or continuous setting button according to preset different time intervals of the motor; the fan button is used for controlling the on or off of the fan; the speed regulating knob is used for controlling the rotating speed of the motor and the fan; the starting or stopping of each electric component is controlled by the starting or emergency stopping button; and the display panel is used for displaying the temperature information of the fermentation liquor in the anaerobic digestion reactor, which is acquired by the first temperature sensor, in real time.
6. The on-line monitoring system for the anaerobic digestion process as claimed in any one of claims 1 to 5, wherein the anaerobic digestion reactor is made of borosilicate glass material, and a double-layer water bath heat preservation layer is arranged in the anaerobic digestion reactor.
7. An on-line monitoring system for anaerobic digestion process according to any of claims 1 to 5, characterized in that said anaerobic digestion reactor is provided with a gas collection port.
8. An on-line monitoring system for anaerobic digestion process as claimed in any one of claims 1 to 5, wherein said stirring device comprises a stirring shaft, the top of said stirring shaft is connected with the output end of said motor, and the bottom of said stirring shaft is symmetrically provided with two stirring blades.
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