CN203715641U - Anaerobic fermentation experimental facility - Google Patents

Abstract

The utility model discloses an anaerobic fermentation experiment device, which comprises a magnetic stirrer, a constant temperature water bath, an anaerobic fermentation reactor, a temperature monitor, a pH value/oxidation-reduction potential detector, a gas collecting bottle and a carbon dioxide absorber. The above-mentioned magnetic stirrer is close to the bottom of the constant temperature water bath. The anaerobic reactor is made of a flat-bottomed glass three-neck bottle. Gas cylinders, and use a three-way regulating valve to control the flow direction, punch holes in the rubber plugs on both sides and insert them into temperature monitors and pH/oxidation-reduction potential detectors respectively. Sealing, the carbon dioxide absorption bottle is made of glass faucet bottle, and the bottle mouth is sealed with a rubber stopper, which is punched and inserted into the biogas conduit. The utility model has strong applicability, low production and use costs, easy operation, and can realize temperature control, material liquid stirring, temperature, pH value/redox potential detection, gas production volume and rate recording, and gas production in anaerobic fermentation experiments. Component analysis, etc. It is suitable for teaching and scientific research of anaerobic fermentation technology.

Description

An anaerobic fermentation experimental device

technical field

The utility model relates to the field of anaerobic fermentation experiment equipment, in particular to an anaerobic fermentation experiment device.

Background technique

Anaerobic fermentation technology is one of the important ways of harmless and resourceful treatment of organic waste. Compared with the traditional energy-consuming aerobic fermentation technology, anaerobic fermentation has many advantages such as low engineering odor, recovery of renewable energy, reduction of greenhouse gas emissions, reduction of potential pathogen pollution, good degradation of organic matter, small amount of sludge production, and less nutrient loss. Advantages, it is widely used in the treatment and comprehensive utilization of various organic wastes such as agricultural manure, planting straw, industrial organic waste liquid and waste residue, urban organic domestic waste, and kitchen waste. Harmless treatment can better obtain clean and renewable energy such as biogas (methane) and hydrogen.

In recent years, China has achieved rapid development in the construction of biogas projects and the application of anaerobic fermentation technology in the treatment mechanism and technology research and development of various organic wastes. Key teaching content for the training of students in engineering and other related disciplines. However, according to the current domestic anaerobic fermentation technology teaching and research situation analysis, the development of experimental equipment is relatively backward. For example, Chinese patent CN202830028U and Chinese patent CN202830039U disclose an anaerobic fermentation biogas experimental device, which can measure the volume of gas produced by anaerobic fermentation and the methane content in biogas. Chinese patent CN202688329U discloses a manual and automatic dual-mode control exhaust Chinese patent CN201713518U discloses a biogas experimental device with stirring device, Chinese patent CN201567328U discloses a biogas experimental device with automatic temperature control, and Chinese patent CN201386100Y discloses a biogas experiment with automatic pressure control function Device, Chinese patent CN2460520Y discloses a kind of experimental hydraulic type anaerobic digestion device. These experimental devices meet the needs of anaerobic digestion experiment teaching and research to a certain extent, but there are still problems such as the regulation of the influencing factors of the anaerobic digestion process and the single detection of the fermentation effect and the high production cost. It is difficult to realize the temperature, stirring, pH value, Comprehensive regulation and detection of multiple factors such as redox potential, gas volume, gas composition, etc., and need to be used in conjunction with gas flow meters, gas chromatographs, infrared gas composition analyzers and other high-cost instruments. Therefore, it has brought certain restrictions on the teaching and scientific research of anaerobic fermentation.

Utility model content

This patent invents an anaerobic fermentation experimental device, which can not only conduct anaerobic fermentation biogas experiment, but also can perform anaerobic fermentation hydrogen production and other anaerobic fermentation experiments, with strong applicability; it can realize temperature control in the fermentation process And monitoring, pH value and oxidation-reduction potential monitoring, stirring, gas production volume and composition detection, comprehensive control and detection indicators, easy to operate; at the same time, the whole set of devices are made of glass instruments commonly used in laboratories, combined with commonly used, such as lye, alcohol amine, etc. Low-cost chemical reagents are suitable, the production and use costs are low, and the accuracy is high.

The technical problem to be solved by the utility model adopts the following technical solutions to realize:

An anaerobic fermentation experimental device, comprising a magnetic stirrer, a constant temperature water bath, an anaerobic fermentation reactor, a temperature monitor, a pH value/oxidation-reduction potential detector, a gas collecting bottle and a carbon dioxide absorbing bottle, characterized in that: the The magnetic stirrer is close to the lower part of the constant temperature water bath, the magnetic stirrer is placed inside the anaerobic fermentation reactor, and the material liquid inside the anaerobic fermentation reactor is stirred by the magnetic stirrer, and the anaerobic fermentation reactor adopts a flat bottom glass The three-neck bottle is made, and each mouth is sealed with a rubber plug. A hole is punched in the rubber plug of the middle port and a biogas conduit is inserted. The biogas enters the gas collecting bottle through the conduit connection, and a three-way regulating valve is used to control the flow direction. hole and insert the temperature monitor and pH/oxidation-reduction potential detector respectively; the gas-collecting bottle is made of wide-mouth glass reagent bottle, the bottle mouth is sealed with a rubber stopper, and the hole is inserted into the biogas conduit and drain pipe, and the carbon dioxide absorption bottle Made of glass faucet bottle, the mouth of the bottle is sealed with a rubber stopper, and a hole is punched to insert a biogas conduit.

The constant-temperature water bath is made of stainless steel, aluminum, copper, ceramics and other non-magnetic and high-temperature-resistant materials, and is used to ensure a constant internal temperature of the anaerobic fermentation reactor.

The body of the three-necked flat-bottomed glass bottle for making the anaerobic reactor is marked with a volume scale from bottom to top, and a magnetic stirrer is placed in the bottle.

The body of the wide-mouth glass reagent bottle for making the gas-collecting bottle is marked with a volume scale from top to bottom, and the bottle is filled with water.

The body of the glass faucet bottle for making the carbon dioxide absorbing bottle is marked with a volume scale from top to bottom, and the bottle is filled with carbon dioxide absorbing liquid.

The solution for absorbing carbon dioxide is: 0.5-1.0 mol/L sodium hydroxide (NaOH) or potassium hydroxide (KOH) aqueous solution with a pH value greater than 12, 0.3-0.5 mol/L solution with a pH value between 9-12 Diethanolamine (DEA), triethanolamine (TEA) or N-methyldiethanolamine (MDEA) aqueous solutions, or other alkaline solutions that can absorb carbon dioxide.

The utility model has the advantage that it can not only carry out the biogas experiment by anaerobic fermentation, but also carry out the hydrogen production by anaerobic fermentation and other anaerobic fermentation experiments, and has strong applicability; , alcohol amine and other commonly used, low-cost chemical reagents are suitable, and the production and use costs are low; the anaerobic reactor, gas collection bottle, and carbon dioxide absorption bottle are all calibrated for volume, which can intuitively and easily record fermentation feed liquid and anaerobic biological gas And the volume parameters of the gas after absorbing carbon dioxide; the use of magnetic stirring avoids the common problem of mechanical stirring dynamic sealing is not strict, and the stirring intensity is adjustable, avoiding the damage of anaerobic micelles by excessive stirring; direct detection of anaerobic bacteria The temperature inside the fermentation reactor can better reflect the actual temperature inside the reactor, and at the same time, it can realize the continuous monitoring of the temperature; at the same time, it can realize the continuous monitoring of the pH value and redox potential; it adopts the drainage gas collection method to collect anaerobic gas, which is intuitive and simple, and at the same time The gas production rate can be calculated according to the gas production in a specific period of time; the spherical bubbler is added to ensure the complete absorption of carbon dioxide (CO2) and other acidic gases in the anaerobic gas production. The volume of methane (CH4) or hydrogen (H2) in the gas, gas composition and content analysis is simple and accurate.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them: 1. Magnetic stirrer; 2. Constant temperature water bath; 3. Magnetic stirrer; 4. Anaerobic fermentation reactor; 5. Temperature monitor; 6. pH value/redox potential detector; 7. Biological gas conduit ; 8. Three-way regulating valve; 9. Gas collecting bottle; 10. Drainage pipe; 11. Carbon dioxide absorbing bottle; 12. Spherical bubbler; 13. Two-way regulating valve;

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific illustrations.

An anaerobic fermentation experimental device, including a magnetic stirrer 1, a constant temperature water bath 2, a magnetic stirrer 3, an anaerobic fermentation reactor 4, a temperature monitor 5, a pH value/oxidation-reduction potential detector 6, and a biogas conduit 7. Three-way regulating valve 8, gas collecting bottle 9, drain pipe 10, carbon dioxide absorbing bottle 11, spherical bubbler 12, two-way regulating valve 13 and measuring cylinder 14. The magnetic stirrer 1 is closely attached to the lower part of the constant temperature water bath 2; the constant temperature water bath 2 is made of stainless steel, aluminum, copper, ceramics and other non-magnetic and high temperature resistant materials, which are used to ensure the internal temperature of the anaerobic fermentation reactor 4 is constant; magnetic stirring The sub 3 is placed inside the anaerobic fermentation reactor 4, and the material liquid inside the anaerobic fermentation reactor 4 is stirred by the magnetic stirrer 1; the volume scale of the anaerobic fermentation reactor 5 is marked from bottom to top to show the fermentation The amount of feed liquid; the temperature monitor 5 and the pH value/oxidation-reduction potential detector 6 are respectively sealed and connected to the two sides of the anaerobic fermentation reactor 4 through rubber plugs, and are used to detect the internal temperature, pH value/oxidation-reduction potential of the anaerobic fermentation reactor 4. Reduction potential; the biogas conduit 7 is sealed and connected to the middle port of the anaerobic fermentation reactor 4 through a rubber plug, and then connected to the three-way regulating valve 8 through a hose, and the biogas conduit 7 is located at the inner end of the anaerobic fermentation reactor 4 and protrudes The length of the rubber stopper does not exceed 5mm; the three-way regulating valve 8, the drain pipe 10 and the gas collecting bottle 9 are sealed and connected by rubber plugs, the three-way regulating valve 8 is located at the inner end of the gas collecting bottle 9, and the length of the rubber plug protruding from the inner end of the gas collecting bottle 9 does not exceed 3mm, and the drain pipe The distance between the lower end of 10 and the bottom of the gas-collecting bottle 9 is no more than 5mm; when collecting gas, adjust the three-way regulating valve to the position where the anaerobic fermentation reactor 4 communicates with the gas-collecting bottle 9; the body of the gas-collecting bottle 9 is marked from top to bottom The volume scale is used to display the gas collection volume, and the bottle is filled with water; when the biogas in the gas collection bottle 9 is collected to a certain volume, connect the drain pipe 10 to the faucet, and adjust the three-way regulating valve to the gas collection bottle 9 and carbon dioxide The absorption bottle 11 is connected to the position, open the two-way regulating valve 13, and slowly open the faucet to press the collected biogas into the carbon dioxide absorption bottle 11 through the water inlet; through the spherical bubbler 12, the biogas and the carbon dioxide absorption bottle 12 are absorbed Liquid (lye, alcohol amine solution, etc.) to fully contact to realize the chemical absorption of carbon dioxide; use 0.5-1.0mol/L sodium hydroxide (NaOH) or potassium hydroxide (KOH) aqueous solution to absorb carbon dioxide, when the pH value is less than 12, it should be Open the 12 rubber stopper of the carbon dioxide absorption bottle and replace the absorption liquid again; use 0.3-0.5mol/L diethanolamine (DEA), triethanolamine (TEA) or N-methyldiethanolamine (MDEA) aqueous solution, and the pH value is less than 9, and the carbon dioxide should be opened The absorption bottle 12 has a rubber stopper and the absorption liquid is replaced again; the absorption liquid discharged from the two-way regulating valve 13 is collected with a measuring cylinder 14, the volume of the absorption liquid in the measuring cylinder 14 and the gas volume in the carbon dioxide absorption bottle 12 are after removing carbon dioxide and other acid gases from the biological gas The volume of gas (such as biogas or hydrogen), the ratio of this volume to the total volume of biogas entering through the gas collecting bottle 9, that is, the content of biogas or hydrogen in the biogas.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (6)

1. an anaerobically fermenting experimental installation, include magnetic stirring apparatus, thermostat water bath, anaerobic fermentation reactor, temperature monitor, pH value/redox potential detector, air collector and carbon dioxide absorption bottle, it is characterized in that: described magnetic stirring apparatus is close to thermostat water bath bottom, magnetic stir bar is placed in to anaerobic fermentation reactor inside, and realize the inner feed liquid of anaerobic fermentation reactor by magnetic stir bar and stir, described anaerobic fermentation reactor adopts flat glass there-necked flask to make, each mouthful all seals with plug, on middle port plug, punch and insert biogas conduit, biogas is connected and is entered air collector by conduit, and adopt three-way control valve control to flow to, both sides chewing-gum punches beyond the Great Wall and inserts respectively temperature monitor and pH/ redox potential detector, described air collector adopts wide-mouth glass reagent bottle to make, and bottleneck seals with plug, and punching insertion biogas conduit and water shoot, and carbon dioxide absorption bottle adopts glass tap bottle to make, and bottleneck seals with plug, and biogas conduit is inserted in punching.

2. anaerobically fermenting experimental installation according to claim 1, is characterized in that: described thermostat water bath adopts stainless steel, aluminium, copper, pottery and other not magnetic conduction, making of high temperature resistant material.

3. anaerobically fermenting experimental installation according to claim 1, is characterized in that: the flat glass there-necked flask body of described making anaerobic reactor marks volume markings from bottom to top, places magnetic stir bar in bottle.

4. anaerobically fermenting experimental installation according to claim 1, is characterized in that: the wide-mouth glass reagent bottle body of described making air collector marks volume markings from top to bottom, the in-built full water of bottle.

5. anaerobically fermenting experimental installation according to claim 1, is characterized in that: the glass tap bottle body of described making carbon dioxide absorption bottle marks volume markings from top to bottom, in bottle, fills carbon dioxide absorbent solution.

6. anaerobically fermenting experimental installation according to claim 1, it is characterized in that: the described solution for absorbing carbon dioxide is: 0.5-1.0mol/L sodium hydroxide or potassium hydroxide aqueous solution that pH value is greater than 12,0.3-0.5mol/L diethanolamine, trolamine or the N methyldiethanol amine aqueous solution between pH value 9-12, or basic solution that can absorbing carbon dioxide.