CN215050357U - Turbulent flow type reaction kettle for producing methane - Google Patents
Turbulent flow type reaction kettle for producing methane Download PDFInfo
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Abstract
The utility model provides a turbulent flow type reation kettle of production marsh gas relates to the chemical industry equipment field. The top of the tank body is provided with an anode wiring hole, a cathode wiring hole and a shaft sleeve, the tank body is provided with a feed inlet and a gas outlet, the feed inlet is connected with a feed pipe, the gas outlet is connected with a gas outlet pipe, the inner side wall of the tank body is provided with a spoiler, the bottom of the tank body is provided with a discharge port, and the discharge port is connected with a discharge pipe; an anode electrode and a cathode electrode for promoting the fermentation reaction are arranged in the tank body; a stirring paddle for stirring is also arranged in the tank body, the stirring paddle comprises a stirring shaft and stirring blades, and the top end of the stirring shaft penetrates through the tank body; the fermentation tank is characterized in that a feed back inlet is formed in the tank body, a feed back outlet is formed in the bottom of the tank body, a feed back pipe is connected between the feed back outlet and the feed back inlet, and a peristaltic pump used for driving fermentation liquor circulation in the fermentation process is arranged on the feed back pipe. The utility model discloses can improve the preparation efficiency of marsh gas.
Description
Technical Field
The utility model relates to a chemical industry equipment field, concretely relates to turbulent flow formula reation kettle of production marsh gas.
Background
When the traditional methane tank is used for fermentation, new methane is continuously generated in the gas storage chamber, the air pressure is increased, and the methane liquid in the main tank is extruded, so that part of the methane liquid flows into the water pressure chamber. When an operator opens the stove, the methane pressure in the gas storage chamber is reduced, so that the methane liquid in the hydraulic chamber flows back to the interior of the main pool again. In the process of gas production and gas utilization, the pressure balance between the fermentation chamber and the discharging chamber is always maintained. However, the traditional methane tank has the problems of too short fermentation route, poor methane liquid fluidity, uneven strain distribution and the like.
Patent document No. CN110819528A discloses a biogas production device and method for a biogas fermentation tank, the biogas production device comprises a fermentation tank for fermenting organic waste, a feeding device is arranged above the fermentation tank, a gas storage device is arranged above the side of the fermentation tank, a discharging device is arranged at the bottom of the fermentation tank, and a stirrer for stirring organic waste is arranged in the fermentation tank; the stirrer comprises a motor arranged right above the fermentation tank body, a stirring rod electrically connected with the motor and arranged in the fermentation tank body and a stirring impeller; the stirring rod, the stirring impeller and the fermentation tank form a voltage generating circuit through a direct current power supply, namely, the anode of the direct current power supply is connected with the stirring rod and the stirring impeller, and the cathode of the direct current power supply is connected with a stainless steel mesh surrounding the inner wall of the fermentation tank, so that carbon dioxide generated by the fermentation of organic wastes is used as a raw material to synthesize the biogas. The device has the defects that the stirring is purely carried out by the stirring device, the stirring of the feed liquid is not uniform enough, and the methane generation efficiency is low.
Patent document with publication number CN205797195U discloses a turbulent flow type reaction kettle, belonging to the field of chemical equipment; this vortex formula reation kettle includes the casing and establishes the (mixing) shaft in the casing, (mixing) shaft and motor connection, and be fixed with the stirring leaf on the (mixing) shaft, the (mixing) shaft is parallel to each other with the stirring leaf, and be hollow rod-like structure and inside and be linked together, and the stirring leaf is close to shells inner wall and sets up, the (mixing) shaft bottom is equipped with the air inlet, and the air inlet goes up sealed activity and is equipped with the joint, still include the air pump, and the outlet duct and the articulate of air pump, be equipped with a plurality ofly on (mixing) shaft and the stirring leaf and communicate with the air inlet, and slope respectively down and the gas outlet that the slope set up. The stirring shaft drives the stirring blades to rotate so as to stir the reactants, and the reactants are rotated along one direction through the gas outlet, so that the reactants on the upper layer and the lower layer can be more uniformly mixed. This vortex formula reation kettle need use the air pump to the inside pump gas of air inlet in the in-process of using, increases manufacturing cost.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of low biogas production efficiency, too short biogas fermentation route, poor biogas slurry fluidity and uneven strain distribution in the prior art, the utility model provides a turbulent type reaction kettle for producing biogas.
A turbulent flow type reaction kettle for producing biogas, which comprises a tank body,
the top of the tank body is provided with an anode wiring hole, a cathode wiring hole and a shaft sleeve, the tank body is provided with a feed inlet for feeding and a gas outlet for discharging gas generated by fermentation, the feed inlet is connected with a feed pipe, the gas outlet is connected with a gas outlet pipe, the inner side wall of the tank body is provided with a spoiler, the bottom of the tank body is provided with a discharge port, and the discharge port is connected with a discharge pipe;
an anode electrode and a cathode electrode for promoting the fermentation reaction are arranged in the tank body, the anode electrode and the cathode electrode are soaked in the fermentation liquor in the fermentation process, the anode electrode is connected with the positive electrode of an external power supply through an anode wiring hole by a lead, and the cathode electrode is connected with the negative electrode of the external power supply through a cathode wiring hole by a lead;
the tank body is also internally provided with a stirring paddle for stirring, the stirring paddle comprises a stirring shaft and stirring blades, the top end of the stirring shaft penetrates through the tank body, and the outer side of the tank body is also provided with a motor for driving the stirring paddle;
the fermentation tank is characterized in that a feed back inlet is formed in the tank body, a feed back outlet is formed in the bottom of the tank body, a feed back pipe is connected between the feed back outlet and the feed back inlet, and a peristaltic pump used for driving fermentation liquor circulation in the fermentation process is arranged on the feed back pipe.
The anode wiring hole and the cathode wiring hole are respectively sealed with a cap through which a lead wire passes.
According to the peclet number Pe-Re × Pr-VL/α, where Re is the reynolds number, Pr is the prandtl number, V is the average flow velocity, L is the characteristic length, α is the thermal diffusivity; it can be seen that the larger the characteristic length value of the solution is under the condition of certain flow rate and thermal diffusivity, the larger the convection diffusion effect is, and the more uniform the liquid mixing is. However, a greater flow rate will generate greater shear forces, which will result in the rupture of the mixed methanogenic bacteria to die when the shear forces exceed the tolerance of the mixed methanogenic bacteria. An excessively high mortality of the mixed methanogenic bacteria has an effect on the efficiency of biogas production.
When the mixed bacteria liquid is mixed, in order to guarantee the activity of the strains, the flow rate of the fermentation liquid is controlled within a certain range, the flow rate of the fermentation liquid is controlled by adding the peristaltic pump outside, the fermentation liquid coming out of the discharge pipe flows back to the tank body again through the peristaltic pump, the characteristic length of the movement of the fermentation liquid is prolonged, the mixing effect of the fermentation liquid and the mixed bacteria liquid is improved under the condition that the flow rate is not increased, the mixed methanogenic bacteria are mixed more uniformly in the tank body, and the efficiency of producing methane is improved.
The turbulence plates and the stirring paddles in the tank body fully mix the fermentation liquor in the tank body; the peristaltic pump outside the tank body returns the fermentation liquid discharged from the discharge pipe to the tank body at a specific flow rate, so that the characteristic length of movement is increased, the internal full mixing and the external characteristic length of movement are combined, the concentration of methane in the methane can be improved, and the production efficiency of the methane is improved.
The feed back import is same with the feed inlet, the feed back export is same with the discharge gate, inlet pipe and discharging pipe are regarded as partial feed back pipe concurrently, the feed back pipe is still including the connecting pipe of connecting inlet pipe and discharging pipe, uses the connecting pipe to put through inlet pipe and discharging pipe as the feed back pipe among the fermentation process, demolishs the connecting pipe before the fermentation begins and after finishing.
The opening and closing of the feeding pipe, the air outlet pipe and the discharging pipe are controlled by a first control valve, a second control valve and a third control valve respectively.
The shape of the spoiler is a half wave shape. The half-wave-shaped spoiler can effectively relieve the impact of fermentation liquor in the tank body on the spoiler, and an environment beneficial to the survival of the mixed methanogenic bacteria is created.
The spoiler is evenly arranged at 90 degrees with the inner side wall of the tank body.
The anode electrode and the cathode electrode are in a wave shape. The shapes of the anode electrode and the cathode electrode are designed into wave shapes, so that mixed methanogenic bacteria can be attached to the surfaces of the anode electrode and the cathode electrode.
In the presence of electrodes, there are three main ways of electron transfer: the electrode is directly contacted with microorganisms for transmission, and the electrode is transmitted through pili outside cell membranes. The electrode is electrified with smaller voltage, the bacteria obtain electrons in the solution, and the electrons are subjected to reduction reaction at the cathode under the action of mixing action and an electric field, so that the reaction for producing the methane is promoted, and the production efficiency of the methane is further improved.
The edge of the stirring blade is streamline.
The surface of the stirring blade is provided with a plurality of through holes for turbulent flow. The streamlined appearance of stirring leaf can reduce the impact of the zymotic fluid that flows to the stirring leaf, and the protection stirring leaf is difficult to destroyed, and a plurality of through-holes that are used for the vortex in stirring leaf surface can form the vortex at the in-process of stirring, make the stirring more even.
A method of producing biogas, the turbulent flow reactor, the method comprising the steps of:
(1) inoculating mixed methanogenic bacteria into a strain nutrient solution for enrichment culture, then inoculating the enriched mixed methanogenic bacteria into a tank body, and then adding sugar mill wastewater into the tank body;
(2) introducing nitrogen into the tank body for aeration, and sealing the tank body after the aeration is finished to ensure that the interior of the tank body is in an anaerobic environment;
(3) controlling the stirring of the stirring paddle, electrifying the cathode electrode and the anode electrode at 0.6V simultaneously to uniformly mix the mixed methanogenic bacteria and the sugar refinery wastewater, controlling the fermentation temperature to be 36-37 ℃, fermenting and collecting the generated gas.
The mixed methanogenic bacteria comprise acetic acid nutritional methanogenic bacteria and hydrogen nutritional methanogenic bacteria. The mixed methanogenic bacteria come from a methane tank of a pig farm. The strain nutrient solution can be replaced by liquid culture medium.
The synergistic effect is generated among the mixed methanogenic bacteria, so that the metabolic products are not easy to accumulate, the metabolic activity of each bacterium is fully exerted, and the yield and the efficiency of the methane are improved.
Mixing methanogenic bacteria on the surface of the anode electrode, and utilizing glucose and acetic acid decomposed by the waste water microorganisms of the sugar refinery to generate hydrogen protons, carbon dioxide and CH3COOH+H2O→CO2↑+H+，C6H12O6+H2O→CO2↑+H+；
On the surface of the cathode electrode, the hydrogen protons are reduced to hydrogen gas, 2H, after obtaining 2 electrons++2e-＝H2×) ×; on the one hand, the hydrogen nutritional type methane-producing bacteria use carbon dioxide and hydrogen as raw materials to produce methane and CO2+H2→CH4↑+H2O; on the other hand, the hydrogen nutrition type methanogenic bacteria on the surface of the cathode electrode synthesizes methane and CO from the hydrogen ions and carbon dioxide generated by the anode as raw materials2+H++8e→CH4↑+H2O；
The reaction is carried out simultaneously, so that the concentration of the biogas in the tank body is further improved, and the efficiency of biogas production is improved.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model not only mixes the methanogenic bacteria to produce methane by using carbon dioxide and hydrogen as raw materials, but also synthesizes the hydrogen ions and carbon dioxide generated by the anode into methane by using the hydrogen nutrition type methanogenic bacteria on the surface of the cathode electrode as raw materials, thereby effectively improving the production efficiency of the methane; the half-wave-shaped spoiler can effectively relieve the impact of the fermentation liquor in the tank body on the spoiler, an environment beneficial to the survival of the mixed methanogenic bacteria is created, and the stirring blades and the spoiler simultaneously act to ensure that the mixed methanogenic bacteria in the tank body and the fermentation liquor are mixed more uniformly; the discharge pipe is connected with the feed pipe by a pipeline with a peristaltic pump, so that the characteristic length of the movement of the fermentation liquid is effectively prolonged, and the problem of poor liquidity of the biogas slurry is solved, so that the mixed methanogenic bacteria and the fermentation liquid are mixed more uniformly; the cathode electrode, the anode electrode, the stirring system, the spoiler and the external peristaltic pump are matched with each other, so that the production efficiency of the methane can be improved.
Drawings
Fig. 1 is a schematic sectional view of the turbulent flow reactor of the present invention.
Fig. 2 is a schematic view of the turbulent flow type reaction kettle of the present invention.
Fig. 3 is a left-side view schematic diagram of the turbulent flow type reaction kettle of the present invention.
Fig. 4 is a schematic plan view of the turbulent reaction kettle of the present invention.
Fig. 5 is a schematic front view of the spoiler of the present invention.
Fig. 6 is a schematic top view of the spoiler of the present invention.
Fig. 7 is a left side view of the spoiler of the present invention.
Fig. 8 is a schematic view of the spoiler of the present invention arranged inside the spoiler-type reaction kettle.
Fig. 9 is a schematic front view of the cathode electrode or the anode electrode according to the present invention.
Fig. 10 is a schematic top view of a cathode electrode or an anode electrode according to the present invention.
Fig. 11 is a left side view schematically illustrating a cathode electrode or an anode electrode according to the present invention.
Fig. 12 is a schematic front view of the stirring paddle of the present invention.
Fig. 13 is a left side view of the stirring paddle of the present invention.
Fig. 14 is a schematic top view of the stirring paddle of the present invention.
In the figure, a tank body 1, a feeding pipe 11, a first control valve 111, an anode wiring hole 12, a shaft sleeve 13, a cathode wiring hole 14, an air outlet pipe 15, a second control valve 151, a discharging pipe 16, a third control valve 161, a spoiler 17, a motor 21, a stirring paddle 22, a stirring shaft 23, a stirring blade 24, an anode electrode 3 and a cathode electrode 4.
Detailed Description
Example 1
As shown in fig. 1 to 4, a turbulent flow type reaction kettle for producing biogas comprises a tank body 1, wherein the top of the tank body 1 is provided with an anode wiring hole 12, a cathode wiring hole 14 and a shaft sleeve 13, the tank body 1 is provided with a feed inlet for feeding and a gas outlet for discharging gas generated by fermentation, the feed inlet is connected with a feed pipe 11, the gas outlet is connected with a gas outlet pipe 15, the inner side wall of the tank body 1 is provided with a turbulent flow sheet 17, the bottom of the tank body 1 is provided with a discharge outlet, and the discharge outlet is connected with a discharge pipe 16;
an anode electrode 3 and a cathode electrode 4 for promoting the fermentation reaction are arranged in the tank body 1, the anode electrode 3 and the cathode electrode 4 are soaked in fermentation liquor in the fermentation process, the anode electrode 3 is connected with the positive pole of an external power supply through a lead via an anode wiring hole 12, and the cathode electrode 4 is connected with the negative pole of the external power supply through a lead via a cathode wiring hole 14;
a stirring paddle 22 for stirring is further arranged in the tank body 1, the stirring paddle 22 comprises a stirring shaft 23 and stirring blades 24, the top end of the stirring shaft 23 penetrates through the tank body 1, and a motor 21 for driving the stirring paddle 22 is further arranged on the outer side of the tank body 1;
the fermentation tank is characterized in that a feed back inlet is formed in the tank body 1, a feed back outlet is formed in the bottom of the tank body 1, a feed back pipe is connected between the feed back outlet and the feed back inlet, and a peristaltic pump used for driving fermentation liquor circulation in a fermentation process is arranged on the feed back pipe. Through adding the peristaltic pump in jar external portion of body 1, the velocity of flow of control zymotic fluid, the zymotic fluid that will come out from the discharging pipe flows back to jar body 1 once more through the peristaltic pump, has prolonged the characteristic length of zymotic fluid motion, under the condition that does not increase the velocity of flow, promotes the mixed effect of zymotic fluid and mixed fungus liquid for the bacterium is more even in jar internal portion mixture, and then promotes the efficiency of producing marsh gas.
The feed back inlet and the feed inlet are the same, the feed back outlet and the discharge outlet are the same, the feed pipe 11 and the discharge pipe 16 are also used as partial feed back pipes, the feed back pipes also comprise connecting pipes for connecting the feed pipe 11 and the discharge pipe 16, the connecting pipes are used for connecting the feed pipe 11 and the discharge pipe 16 in the fermentation process and are used as feed back pipes, and the connecting pipes are detached before and after the fermentation is started.
The opening and closing of the feed pipe 11, the outlet pipe 15, and the discharge pipe 16 are controlled by a first control valve 111, a second control valve 151, and a third control valve 161, respectively.
Fig. 5-8 are the utility model discloses a spoiler 17's schematic diagram, spoiler 17's appearance is half-wave shape, and spoiler 17 is 90 degrees with jar body 1's inside wall and evenly arranges. The half-wave-shaped spoiler 17 can effectively relieve the impact of fermentation liquor in the tank body on the spoiler 17, and an environment beneficial to the survival of the mixed methanogenic bacteria is created
Fig. 9-11 are the schematic diagrams of the cathode electrode 4 or the anode electrode 3 of the present invention, the shapes of the anode electrode 3 and the cathode electrode 4 are wave, the wave design is favorable for the adhesion of bacteria, and the proceeding of the electrode surface reaction is further accelerated.
Fig. 12 to 14 show the utility model discloses stirring rake 22's schematic diagram, stirring rake 22 include (mixing) shaft 23 and stirring leaf 24, and 24 appearance design of stirring leaf are streamlined, and stirring leaf 24's surface still is equipped with a plurality of through-holes that are used for the vortex. The streamline design of the shape of the stirring blade 24 can slow down the impact of the fermentation liquid on the stirring blade 24, and a plurality of through holes for turbulent flow can form vortex in the stirring process of the stirring blade 24, so that bacteria and the fermentation liquid are mixed more uniformly.
When the turbulent flow type reaction kettle works, inoculating the mixed methanogenic bacteria into strain nutrient solution for enrichment culture, inoculating the enriched mixed methanogenic bacteria into the tank body 1, and adding the wastewater of the sugar refinery into the tank body 1 through the feeding pipe 11; introducing nitrogen into the tank body 1 for aeration, closing the first control valve 111, the second control valve 151 and the third control valve 161 after the aeration is finished, and sealing the tank body 1 to ensure that the interior of the tank body 1 is in an anaerobic environment; and then controlling the stirring paddle 22 to stir, electrifying the cathode electrode 4 and the anode electrode 3 at 0.6V simultaneously to uniformly mix the mixed methanogenic bacteria and the sugar refinery wastewater, controlling the fermentation temperature to be 36-37 ℃, connecting the discharge pipe 16 and the feed pipe 11 by using a feed back pipe with a peristaltic pump, opening the first control valve 111 and the third control valve 161 to circulate the fermentation liquid, and simultaneously opening the second control valve 151 to collect the generated gas.
The mixed methanogenic bacteria include acetogenic methanogenic bacteria and hydrogenogenic methanogenic bacteria.
Example 2
Sludge is obtained from a methane tank of a certain pig farm in Shengzhou city in Zhejiang province, and the anaerobic sludge is separated to finally obtain the mixed bacteria for producing methane.
A1000 mL Erlenmeyer flask was taken out and sterilized in an autoclave at 100 ℃ for 30 min. And (3) cooling the sterilized triangular flask to room temperature, adding 300mL of anaerobic sludge into the triangular flask, and storing in an environment without other mixed bacteria. Preparing a liquid culture medium, wherein the components of the liquid culture medium are as follows: 10g/L nitrilotriacetic acid, 2g/L peptone, 2g/L yeast powder, 0.5g/L cysteine, 0.4g/L K2HPO4、0.2g/L MgCl2·6H2O and 1L of distilled water, sterilizing the prepared liquid culture medium for 15min at the temperature of 121 ℃, adding 600mL of liquid culture medium into a 1000mL sterilized triangular flask,
adding the preserved 300mL of anaerobic sludge into 600mL of liquid culture medium, uniformly mixing, standing the uniformly mixed triangular flask in an anaerobic tank for 7 days for enrichment, wherein the conditions of the anaerobic tank are as follows: 10% hydrogen, 10% carbon dioxide and 80% nitrogen at 35 + -1 deg.C. After 3 days, the supernatant was removed and the above operation was repeated 3 times to obtain enriched mixed methanogenic bacteria.
Add into the usefulness with the mixed methanogenic bacterium 500mL after the above-mentioned enrichment in 3L sugar refinery waste water the utility model discloses a vortex formula reation kettle's of spoiler vortex jar body 1 in and the misce bene, the total volume of fermentation cylinder is 5L, COD in the sugar refinery waste water is 5000mg/L, jar body 1 is used the utility model discloses a length of spoiler is 12cm, the widest department is 3cm, thickness is 3mm, to leading to behind the nitrogen gas 30min in jar body 1, seal jar body 1 and make jar body 1 be in anaerobic environment, connect inlet pipe 11 and discharging pipe 16 with the peristaltic pump, the zymotic fluid gets into inlet pipe 11 through the peristaltic pump from discharging pipe 16, carries out the circulation of zymotic fluid, fermentation to no longer producing gas, the zymotic fluid flows from discharging pipe 16, gets cathode electrode's after the fermentation finishesMycoderm 1mm2Dissolving in sterile water, collecting supernatant, diluting 10 μ L9Then 10. mu.L of the suspension was subjected to colony counting by plate coating.
The results show that the daily output of the biogas in the fermentation tank is 1.27L.
Comparative example 1
Sludge is obtained from a methane tank of a certain pig farm in Shengzhou city in Zhejiang province, and the anaerobic sludge is separated to finally obtain the mixed bacteria for producing methane.
A1000 mL Erlenmeyer flask was taken out and sterilized in an autoclave at 100 ℃ for 30 min. And (3) cooling the sterilized triangular flask to room temperature, adding 300mL of anaerobic sludge into the triangular flask, and storing in an environment without other mixed bacteria. Preparing a liquid culture medium, wherein the components of the liquid culture medium are as follows: 10g/L nitrilotriacetic acid, 2g/L peptone, 2g/L yeast powder, 0.5g/L cysteine, 0.4g/L K2HPO4、0.2g/L MgCl2·6H2O and 1L of distilled water, sterilizing the prepared liquid culture medium for 15min at the temperature of 121 ℃, adding 600mL of liquid culture medium into a 1000mL sterilized triangular flask,
adding the preserved 300mL of anaerobic sludge into 600mL of liquid culture medium, uniformly mixing, standing the uniformly mixed triangular flask in an anaerobic tank for 7 days for enrichment, wherein the conditions of the anaerobic tank are as follows: 10% hydrogen, 10% carbon dioxide and 80% nitrogen at 35 + -1 deg.C. After 3 days, the supernatant was removed and the above operation was repeated 3 times to obtain enriched mixed methanogenic bacteria.
Adding 500mL of the enriched mixed methanogenic bacteria and 3L of sugar refinery wastewater into a tank body 1 of a turbulent flow type reaction kettle disturbed by a common spoiler, uniformly mixing, wherein the spoiler used by the tank body 1 is the common spoiler, the length of the common spoiler is 12cm, the width of the common spoiler is 3cm, and the thickness of the common spoiler is 3mm, introducing nitrogen into the tank body 1 for 30min, sealing the tank body 1 to ensure that the tank body 1 is in an anaerobic environment, connecting a feed pipe 11 with a discharge pipe 16 by using a peristaltic pump, allowing fermentation liquor to enter the feed pipe 11 from the discharge pipe 16 through the peristaltic pump, circulating the fermentation liquor until no gas is generated, allowing the fermentation liquor to flow out of the discharge pipe 16, and taking a bacterial membrane of a cathode electrode 1mm after the fermentation is finished, wherein the fermentation liquor does not generate gas any more2In sterile waterDissolving, collecting supernatant, diluting 10 μ L9Then 10. mu.L of the suspension was subjected to colony counting by plate coating.
The results show that the daily output of the biogas in the fermentation tank is 1.06L.
The colony counting results of example 2 and comparative example 1 show that the colony count in example 2 is 3.3 times the colony count in example 1, which indicates that the spoiler in the present invention is advantageous for the attachment of the mixed methanogenic bacteria. The daily output of marsh gas in the ratio of the daily output of marsh gas of embodiment 2 is 0.21L than the daily output of marsh gas in the comparison 1, shows that the utility model provides a vortex formula reation kettle with the utility model discloses a combination of vortex piece can effectively improve the output of marsh gas.
Example 3
Use CFD software (Computational Fluid Dynamics) right the utility model discloses a stirring leaf is simulated, and the diameter of a emulation section of thick bamboo is 20cm, and highly is 27cm, and the volume is about 8L, the utility model discloses a parameter of stirring leaf is length 60mm, width 20mm, thickness 1mm, if the utility model discloses well double-deck design is equipped with the through-hole of vortex. The simulation results are as follows:
the average velocity of flow of zymotic fluid is 0.2 ~ 0.75m/s the utility model discloses an in the space that stirring leaf edge relates to, the velocity of flow of zymotic fluid presents the gradient and distributes, and the velocity of flow of zymotic fluid uses the stirring rake to reduce to the outside gradually as the center, and the circumference velocity of flow of zymotic fluid increases, and the axial velocity of flow reduces.
Comparative example 2
The CFD software (Computational Fluid Dynamics) is used for simulating the common stirring blade, the diameter of a simulation cylinder is 20cm, the height of the simulation cylinder is 27cm, the volume of the simulation cylinder is about 8L, and the parameters of the common stirring blade are that the length is 60mm, the width is 20mm, the thickness is 1mm, the single-layer design is adopted, and no turbulent flow through holes exist. The simulation results are as follows:
the average flow velocity of the fermentation liquor is 0.1-0.65 m/s, the flow velocity of the fermentation liquor in a partial area is mutated, the flow velocity of the fermentation liquor is difficult to monitor in a space with the length of 0.6 times of that of a common stirring blade, and the gradient gradual change of the flow velocity of the fermentation liquor is avoided.
The results of the CFD simulations of example 3 and comparative example 2 show that the stirring effect of example 3 is better than that of comparative example 2, and that example 3 can increase the effective mixing volume of the fermentation broth by more than 30%.
Claims (8)
1. A turbulent flow type reaction kettle for producing biogas comprises a tank body and is characterized in that,
the top of the tank body is provided with an anode wiring hole, a cathode wiring hole and a shaft sleeve, the tank body is provided with a feed inlet for feeding and a gas outlet for discharging gas generated by fermentation, the feed inlet is connected with a feed pipe, the gas outlet is connected with a gas outlet pipe, the inner side wall of the tank body is provided with a spoiler, the bottom of the tank body is provided with a discharge port, and the discharge port is connected with a discharge pipe;
an anode electrode and a cathode electrode for promoting the fermentation reaction are arranged in the tank body, the anode electrode and the cathode electrode are soaked in the fermentation liquor in the fermentation process, the anode electrode is connected with the positive electrode of an external power supply through an anode wiring hole by a lead, and the cathode electrode is connected with the negative electrode of the external power supply through a cathode wiring hole by a lead;
the tank body is also internally provided with a stirring paddle for stirring, the stirring paddle comprises a stirring shaft and stirring blades, the top end of the stirring shaft penetrates through the tank body, and the outer side of the tank body is also provided with a motor for driving the stirring paddle;
the fermentation tank is characterized in that a feed back inlet is formed in the tank body, a feed back outlet is formed in the bottom of the tank body, a feed back pipe is connected between the feed back outlet and the feed back inlet, and a peristaltic pump used for driving fermentation liquor circulation in the fermentation process is arranged on the feed back pipe.
2. The turbulent flow reactor of claim 1, wherein the feed back inlet is the same as the feed inlet, the feed back outlet is the same as the feed outlet, the feed tube and the discharge tube also serve as part of the feed back tube, the feed back tube further comprises a connecting tube connecting the feed tube and the discharge tube, the connecting tube is used for connecting the feed tube and the discharge tube as the feed back tube during fermentation, and the connecting tube is removed before and after fermentation.
3. The turbulent flow reactor of claim 1, wherein the inlet pipe, the outlet pipe and the outlet pipe are controlled to open and close by a first control valve, a second control valve and a third control valve, respectively.
4. The turbulent flow reactor of claim 1, wherein the shape of the spoiler is a half wave shape.
5. The turbulent flow reactor of claim 1, wherein the baffles are uniformly arranged at 90 degrees to the inner sidewall of the tank.
6. The turbulent flow reactor of claim 1, wherein the anode and cathode electrodes are corrugated in shape.
7. The turbulent flow reactor of claim 1, wherein the edges of the stirring vanes are streamlined.
8. The turbulent flow type reactor as claimed in claim 1, wherein the surface of the stirring blade is provided with a plurality of through holes for turbulent flow.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113073047A (en) * | 2021-05-18 | 2021-07-06 | 浙江大学 | Turbulent flow type reaction kettle and method for producing methane |
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| CN113073047A (en) * | 2021-05-18 | 2021-07-06 | 浙江大学 | Turbulent flow type reaction kettle and method for producing methane |
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Granted publication date: 20211207 |