CN116970482A - Circulation type dry anaerobic reactor and fermentation system - Google Patents
Circulation type dry anaerobic reactor and fermentation system Download PDFInfo
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- CN116970482A CN116970482A CN202310873214.9A CN202310873214A CN116970482A CN 116970482 A CN116970482 A CN 116970482A CN 202310873214 A CN202310873214 A CN 202310873214A CN 116970482 A CN116970482 A CN 116970482A
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- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
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- 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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Abstract
The circulation type dry anaerobic reactor comprises a vertical tank body, wherein a feed inlet, a discharge outlet and a biogas outlet are formed in the tank body, a rotatable stirring shaft is longitudinally inserted into the tank body in a penetrating manner, a cylindrical mixing baffle is fixedly supported on the outer side of the stirring shaft, and a forward propulsion blade section and a reverse propulsion blade section are respectively arranged at the upper end and the lower end of the stirring shaft and penetrate through the mixing baffle; the forward propulsion blade section and the reverse propulsion blade section respectively comprise blades which form a section of spiral on the stirring shaft, and the directions of the blades in the forward propulsion blade section and the reverse propulsion blade section are opposite; the radius of the blade in the forward propulsion blade section is larger than that of the blade in the reverse propulsion blade section, the forward propulsion blade section is close to the inner wall of the mixing baffle, and a gap is reserved between the reverse propulsion blade section and the inner wall of the mixing baffle. The invention can accelerate the fermentation efficiency of the organic garbage in the tank and improve the treatment capacity of the organic garbage in the tank.
Description
Technical Field
The invention relates to the technical field of anaerobic fermentation of organic garbage, in particular to a circulation type dry anaerobic reactor and a fermentation system.
Background
The organic garbage refers to solid waste containing a large amount of degradable organic matters in the household garbage, mainly derived from garden garbage and kitchen garbage, and comprises kitchen meal residues, paper, bamboo, leaves, weeds, plant residues and the like. In recent years, with the gradual development of recycling, harmless and reduction treatment of organic wastes, anaerobic biological fermentation treatment has gradually replaced composting, incineration and other treatment technologies by virtue of the advantages of generating economic benefits by biogas generation and recycling by producing fermentation residues, biogas residues and biogas slurry in a forest field, and has become a preferred way for realizing the aim of 'three-treatment' of organic wastes.
The anaerobic fermentation of the organic garbage generally adopts a plug-flow dry anaerobic fermentation technology, and the technology can effectively treat the organic garbage fermentation substrate with the solid content of 25-35% through a complete set of dry anaerobic fermentation tanks and related matched equipment. However, due to the refined development of urban household garbage classification, organic garbage starts to show the characteristics of materials such as easy degradation, lower carbon nitrogen ratio, high grease content and the like, under the comprehensive influence of the characteristics, the traditional plug-flow dry anaerobic reactor is easy to have an organic load overload condition at a feeding end, and can cause acidification risks in a local area of a tank body, so that an integral anaerobic system faces acidification collapse, and therefore, great process control difficulty is brought to the stable operation of the dry anaerobic fermentation treatment of the organic garbage.
The organic garbage dry anaerobic reactor takes material plug flow (high-concentration suspended solid fermentation raw materials enter from one end and are discharged from the other end, material particles passing through the reactor are discharged in the same sequence as the material particles enter, and the arrangement sequence of the particles is kept unchanged in the reactor) as a core, and several forms, namely a horizontal multi-shaft plug flow anaerobic technology and a horizontal long (single) shaft plug flow type anaerobic technology are developed. In the process of treating the classified organic garbage, the anaerobic technology causes the problems of incomplete mixing of fermentation substrates and inoculums, uneven dispersion of materials in a tank, poor mass transfer effect, unbalanced degradation rate of the organic materials, high local acidification risk, weak buffering capacity of an anaerobic system and the like due to material plug flow and high solid content, so that serious process operation risk is brought to the anaerobic system. The traditional fully-mixed anaerobic reactor (continuous stirred tank reactor), namely CSTR for short, can lead fermentation raw materials and microorganisms to be in a fully-mixed state, and enables a material system to be in a uniform state through strong stirring so as to be beneficial to uniform reaction and heat transfer, but the type of reactor is generally used for fermentation materials with solid content of 4% -10% and particle size of less than or equal to 8mm, the stirring speed has obvious influence on anaerobic reaction, and the materials in the reactor are difficult to mix uniformly if the stirring speed is low; the stirring speed is high, and the ecological instability of the anaerobic reaction can be caused. Besides the characteristic of higher solid content, the particle size of the organic garbage is larger, generally less than 60mm, the composition of the organic garbage is complex, and impurities which can bring about great negative influence on stirring equipment possibly exist, so that the CSTR reactor is obviously not suitable for anaerobic treatment of the organic garbage.
Therefore, when the dry anaerobic technology is utilized to treat the organic garbage, the adaptability to the material characteristics of the anaerobic reactor and the mass transfer effect of the reactor need to be fully considered, and how to design a set of fully-mixed dry anaerobic fermentation system becomes a great difficulty in the anaerobic treatment technology. At present, the anaerobic fermentation tank body of the organic garbage is generally divided into a dry plug-flow type digestion tank and a wet type full-mixing digestion tank.
The solid content of the material in the dry plug flow type digestion tank is 25% -35%, a horizontal long (single) shaft plug flow type anaerobic technology and a horizontal multi-shaft plug flow type anaerobic technology are adopted, the material in the dry plug flow type digestion tank is mixed with fermented sludge discharged from a discharge port of the digestion tank before entering the digestion tank, and then is pumped into the digestion tank by a high-pressure plunger pump, a stirring shaft in the tank penetrates from the front end of the tank body to the rear end of the tank body, and is slowly stirred, and the material in the tank slowly moves towards the rear end of the tank along with the discharge action of the discharge port, so that the plug flow type reaction of the material is realized; the latter adopts multiaxis design, has 5 ~ 10 axles according to jar body volume size, and the (mixing) shaft crosses jar body side, and every (mixing) shaft is all independent to install drive arrangement and stirring paddle, and the (mixing) shaft odd-numbered group and even-numbered group corotation and reversal operation, advances jar material and accomplishes with jar interior fermentation material's quick inoculation along with stirring paddle's disturbance effect after the jar body, relies on digestion jar discharge gate discharge effect to realize the material plug flow reaction equally.
The solid content of the material in the tank is 4-10% and the solid content of the fermented material in the tank is 2.0-6.0%, the top of the tank is provided with a stirring motor, the stirring shaft extends into the fermentation tank from top to bottom, and two to three groups of propelling stirring blades are arranged. The stirring motor drives the stirring blade to rotate in the running process, so that a strong turbulence effect is generated in the tank, and the efficient mixing of fermentation materials in the tank is realized.
The above production process/method has the defects that: the selection of the type of the anaerobic fermentation tank body is limited by basic parameters of a substrate, when the organic garbage with high solid content is treated, only a dry plug-flow type anaerobic digestion tank can be selected, however, the digestion tank has some problems when the organic garbage is digested, on one hand, the plug-flow principle of the tank body and the high solid content characteristic of the material possibly lead to uneven dispersion of the material into the tank, the material cannot be completely contacted with fermented sludge inoculant, the inoculation effect is limited, and further the problems of unbalanced degradation rate of the organic material, high local acidification risk, weak buffering capacity of an anaerobic system and the like are caused, so that serious process operation risk is brought to the anaerobic system; on the other hand, the front end and the rear end in the digestion tank form obviously different degradation pressures under the action of plug flow, fresh materials at the front end are piled up, the microbial degradation pressure is high, the flora is active, the organic materials which are degraded and produce biogas are basically finished to be treated at the rear end, the microbial flora activity is reduced, and therefore the front end and the rear end of the digestion tank are unbalanced in treatment, and the treatment load of an anaerobic system is not improved.
Whereas wet total-mixing digesters suffer from the following drawbacks:
1) The stirring mode has poor uniformity effect on anaerobic reaction, and the materials in the reactor are difficult to mix evenly when the stirring speed is low; the stirring speed is high, so that the ecological instability of the anaerobic reaction can be caused.
2) Because the materials mainly formed by the stirrer move on the circumference, the tangential velocity of the movement of the materials is different, and the shearing stress of the movement of the peripheral materials can be overlarge, thereby having negative influence on symbiotic communities of acetogenic bacteria and methanogenic bacteria.
3) Because the material up-and-down motion capability is weaker, the material concentration, anaerobic concentration and biochemical reaction effect on the upper and lower parts of the reactor are greatly different for materials with different concentrations.
The above disadvantages may cause that this type of digester cannot handle organic waste with a high solid content.
In view of the above, the present inventors have developed and devised the present invention by actively studying and modifying the development of the present invention, aiming at many defects and inconveniences caused by the lack of perfection in the existing anaerobic fermentation reactor for organic waste.
Disclosure of Invention
The invention aims to provide a circulation type dry anaerobic reactor and a fermentation system, which can effectively realize full inoculation of organic garbage in a tank, accelerate fermentation efficiency of the organic garbage in the tank and improve treatment capacity of the organic garbage in the tank.
In order to achieve the above object, the solution of the present invention is:
the circulation type dry anaerobic reactor comprises a vertical tank body, wherein a feed inlet, a discharge outlet and a biogas outlet are formed in the tank body, a rotatable stirring shaft is longitudinally inserted into the tank body in a penetrating manner, a cylindrical mixing baffle is fixedly supported on the outer side of the stirring shaft, and a forward propulsion blade section and a reverse propulsion blade section are respectively arranged at the upper end and the lower end of the stirring shaft and penetrate through the mixing baffle; the forward propulsion blade section and the reverse propulsion blade section respectively comprise blades which form a section of spiral on the stirring shaft, and the directions of the blades in the forward propulsion blade section and the reverse propulsion blade section are opposite; the radius of the blade in the forward propulsion blade section is larger than that of the blade in the reverse propulsion blade section, the forward propulsion blade section is close to the inner wall of the mixing baffle, and a gap is reserved between the reverse propulsion blade section and the inner wall of the mixing baffle.
Further, a forward pushing area is formed in the propeller blade area of the forward pushing blade section, a reverse pushing area is formed in the propeller blade area of the reverse pushing blade section, the reverse pushing blade section pushes fermentation materials to the top end of the tank, a forced mixing area is formed between the forward pushing area and the reverse pushing area in the mixing baffle, the fermentation materials are conveyed to the bottom of the reactor from a gap between the reverse pushing blade section and the mixing baffle, and then the fermentation materials move to the top of the tank from the outside of the mixing baffle.
Further, the rotation direction of the stirring shaft corresponds to the disk rotation rising direction of the blades in the forward propulsion blade section; the blades in the forward propulsion blade section are higher than the upper end of the mixing baffle by at least one screw pitch, and the reverse propulsion blade section extends downwards from the lower end of the mixing baffle to be close to the bottom of the tank body.
Further, the radius of the blades in the reverse propulsion blade section is 0.8 times of the radius of the blades in the forward propulsion blade section, the height-to-diameter ratio of the tank body is 7.5-8.0, the highest design liquid level is 0.85 times of the height inside the tank body, the solid content of the fed fermented organic garbage is 25-40%, and the solid content of the fermented sludge in the tank is 15-28%.
Further, the tank body is internally fixed with a supporting seat for supporting a mixing baffle, the diameter of the mixing baffle is 0.5 times of the diameter of the inner side of the tank body, and the volume between the outer side of the mixing baffle and the inner wall of the tank body is 3 times of the volume of the inner side of the mixing baffle.
Further, a positive and negative pressure protector which can ensure the safe operation of the reactor under a certain pressure is arranged on the tank body.
Further, the feed inlet corresponds to the outside position at the compounding baffle upper end, and the discharge gate corresponds to the outside position at the compounding baffle lower extreme, still is equipped with at least one and can adds the technology reservation mouth of exogenesis material on the jar top of jar body.
Further, a temperature sensor is arranged in the tank body, a water bath jacket capable of introducing circulating hot water is further arranged on the surface of the tank body, a water inlet and a water outlet are arranged in the water bath jacket, and the water inlet and the water outlet are both communicated to a constant-temperature water bath box.
Further, valves are respectively matched in the feed inlet and the discharge outlet, and one end of the stirring shaft is connected to a driving motor positioned outside the tank body.
The circulating dry anaerobic fermentation system comprises the circulating dry anaerobic reactor, a PLC control cabinet, a biogas flowmeter, a constant-temperature water bath box, a temperature sensor, a driving motor and a feed inlet valve, wherein the biogas flowmeter is connected to the outside of a biogas outlet of the reactor, and the biogas flowmeter, the constant-temperature water bath box, the temperature sensor, the driving motor and the feed inlet valve are respectively connected to the PLC control cabinet.
After adopting above-mentioned structure, this patent can realize following purpose:
(1) The fully-mixed dry anaerobic reactor is designed for organic garbage, and has higher adaptability and latitude for the type of materials entering a tank, the solid content range and the particle size.
(2) After the material entering the tank enters the tank, a better dispersing effect can be realized in the tank, and the material can be fully inoculated with the fermentation material in the tank, so that the material entering the tank can be fully degraded anaerobically and digested to produce methane, and meanwhile, mass and heat transfer in the tank are also facilitated.
(3) The reactor has low stirring shearing force, can be suitable for materials with high solid content, ensures better mixing efficiency, and avoids damaging anaerobic microorganism flocs.
(4) The reactor can avoid overload of local load in the tank, can accelerate the fermentation efficiency of the organic garbage in the tank and improve the organic garbage treatment load in the tank.
Drawings
FIG. 1 is a schematic structural view of a reactor according to the present invention;
FIG. 2 is a schematic illustration of the internal operation of the reactor of the present invention;
FIG. 3 is a schematic diagram of the overall structure of the fermentation system of the present invention;
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
Referring to fig. 1 to 3, the invention discloses a circulation type dry anaerobic reactor, which is used for feeding organic garbage for anaerobic fermentation to generate biogas, and comprises a vertical tank body 1, wherein a feed inlet 11, a discharge outlet 12 and a biogas outlet 13 are arranged on the tank body 1. Meanwhile, a rotatable stirring shaft 2 is longitudinally inserted through the tank 1, one end of the stirring shaft 2 is connected to a driving motor 21 (in this embodiment, disposed above the stirring shaft 2 and above the tank 1) located outside the tank, and the driving motor 21 drives the stirring shaft 2 to rotate. The mixing baffle 3 of a cylinder is supported and fixed on the outer side of the stirring shaft 2, the mixing baffle 3 surrounds the outer side of the stirring shaft 2, a bidirectional two-section propeller blade is formed on the stirring shaft 2, and a forward propulsion blade section 4 and a reverse propulsion blade section 5 are respectively arranged at the upper end and the lower end of the stirring shaft 2 and penetrate through the mixing baffle 3. Wherein the forward propulsion blade section 4 and the reverse propulsion blade section 5 respectively comprise a section of spiral blade formed on the stirring shaft 2, the blade in the forward propulsion blade section 4 is defined as a forward blade 41, the blade in the reverse propulsion blade section 5 is a reverse blade 51, and the directions of the forward propulsion blade section 4 and the reverse propulsion blade section 5 are opposite, namely, the spiral directions of the forward blade 41 and the reverse blade 51 are opposite. Meanwhile, the radius of the forward blade 41 in the forward propulsion blade section 4 is larger than that of the blade 51 in the reverse propulsion blade section 5, the forward propulsion blade section 4 and the reverse propulsion blade section 5 are positioned on the inner side of the mixing baffle 3, the forward propulsion blade section 4 is close to the inner wall of the mixing baffle 3, and a gap d is reserved between the reverse propulsion blade section 5 and the inner wall of the mixing baffle 3.
As shown in fig. 2, a forward pushing area a is formed in the propeller blade area of the forward pushing blade section 4, a reverse pushing area B is formed in the propeller blade area of the reverse pushing blade section 5, the reverse pushing blade section pushes the fermented material to the top of the tank, a forced mixing area C is formed between the forward pushing area a and the reverse pushing area B in the mixing baffle 3, and the fermented material can be conveyed to the bottom of the reactor tank 1 from a gap d between the reverse pushing blade section 5 and the mixing baffle 3 and then move from the outside of the mixing baffle 3 to the top of the tank. When the reactor works, organic garbage materials enter from the feed inlet 11, the rotation direction of the stirring shaft 2 corresponds to the spiral ascending direction of the forward blades 41 in the forward propulsion blade section 4, and the forward blades 41 in the embodiment extend upwards on the stirring shaft 2 in a clockwise direction, so that the stirring shaft 2 rotates clockwise. In the region between the forward propulsion blade section 4 and the reverse propulsion blade section 5, i.e. in the forced mixing zone C, in the inner side of the mixing baffle 3, on the one hand, the material pushed by the upper and lower propeller blades forms turbulence in the middle region of the two propeller blades, and on the other hand, a part of the fermented material spreads radially outwards from the reverse propulsion blade section 5, enhancing the mixing in the space between the reverse propulsion blade section 5 and the inner wall of the mixing baffle 3. Since the radius of the forward blade 41 is larger than that of the reverse blade 51, and a gap d is reserved between the reverse blade 51 and the inner wall of the mixing baffle 3, the axial pushing effect of the forward blade 41 is better than that of the reverse blade 51, and the fermentation material is conveyed to the bottom of the reactor from the gap d and then moves to the top of the tank from the outside of the mixing baffle 3. Because the volume between the outside of the mixing baffle 3 and the inner wall of the tank body is larger than the volume in the mixing baffle 3, the fermentation material slowly moves upwards at the outer ring (the outer ring formed at the outside of the mixing baffle 3) and is free from forced stirring interference in the moving process, thereby being beneficial to forming a stable anaerobic fermentation environment and further ensuring the full degradation of the organic garbage by anaerobic microorganism clusters.
Further, forward paddles 41 in the forward propulsion paddle section 4 can be made to be higher than the mixing baffle 3, the forward paddles 41 can be made to be higher than the height of at least one screw pitch at the upper end of the mixing baffle 3, the height h is formed, in the normal operation process of the anaerobic fermentation reactor, the fermentation material positioned on the upper layer of the reactor is ensured to be captured by the stirred forward paddles 41, a scum layer is avoided to be formed, and meanwhile, the circulating motion of the tank material can be promoted. The reverse blades 51 of the reverse propulsion blade section 5 extend downwards from the lower end of the material mixing baffle 3 to be close to the bottom of the tank body, so that bottom sediment can be conveyed upwards, and generation of a sediment layer is avoided.
In the embodiment, the radius of the blade in the reverse propulsion blade section is 0.8 times of the radius of the blade in the forward propulsion blade section, the height-to-diameter ratio of the tank body 1 is 7.5-8.0, the highest design liquid level is 0.85 times of the height inside the tank body, the solid content of the fed fermented organic garbage is 25-40%, and the solid content of the fermented sludge in the tank is 15-28%. A supporting seat 31 for supporting the material mixing baffle 3 is fixed in the tank 1 so as to fix the material mixing baffle 3 in the tank 1. Meanwhile, the diameter of the mixing baffle 3 is 0.5 times of the diameter of the inner side of the tank body, and the volume between the outer side of the mixing baffle 3 and the inner wall of the tank body is 3 times of the volume of the inner side of the mixing baffle 3. The tank body 1 can form a double-layer tank body, the feed inlet 11 can be correspondingly arranged at the outer side of the upper end of the mixing baffle 3, the discharge outlet 12 is positioned below the feed inlet 1, and the discharge outlet 12 is correspondingly arranged at the outer side of the lower end of the mixing baffle 3. Valves 111 and 121 are respectively matched in the feed inlet 11 and the discharge outlet 12, the valve 111 of the feed inlet is normally closed, the valve 121 of the discharge outlet is normally closed and is opened when organic garbage materials are required to be fed into the anaerobic reactor, and the valve 111 of the discharge outlet is opened when fermented sludge of the anaerobic reactor is required to be discharged. At least one process reserved opening 14 for adding exogenous materials is arranged on the tank top of the tank body 1, a valve in the process reserved opening 14 is normally closed, and when necessary, exogenous materials such as alkali solution, microelement solution and the like are added into the fermentation tank from the opening. The tank body 1 is also provided with a positive and negative pressure protector 15, and the positive and negative pressure protector ensures that the reactor can safely run under certain pressure, and methane is released to the outside to reduce the pressure when the pressure exceeds the high-level pressure, and external air is sucked to raise the pressure when the pressure is lower than the low-level pressure.
In order to stabilize the temperature in the reactor, a water bath jacket 6 capable of introducing circulating hot water is further arranged on the surface of the tank body 1, and the water bath jacket 6 can be a sandwich structure of the reactor and can be filled with hot water. The water bath jacket 6 is provided with a water inlet 61 and a water outlet 62, and the water inlet 61 and the water outlet 62 are both communicated with a constant-temperature water bath tank 63. The water inlet 61 is a water inlet valve of the water bath jacket, and hot water generated by the constant-temperature water bath 63 enters the water bath jacket 6 from the water inlet. The water outlet 62 is a water outlet valve of the water bath jacket, and hot water introduced into the water bath jacket flows back to the constant-temperature water bath tank from the water outlet. The constant-temperature water bath 63 can receive the signal of the PLC control cabinet, deliver hot water with specific temperature to the reactor, and control the process temperature of the anaerobic fermentation system.
As shown in FIG. 3, the invention also discloses a circulation type dry anaerobic fermentation system which comprises the circulation type dry anaerobic reactor and a PLC control cabinet 7. The biogas outlet 13 of the reactor discharges biogas generated by anaerobic fermentation in the reactor, the biogas outlet 13 is externally connected with a biogas flowmeter 131, and the biogas flowmeter 131 can measure the biogas flow rate generated by the reactor in real time and transmit data to the PLC control cabinet 7. The tank body 1 is internally provided with a temperature sensor 16, and the temperature sensor 16 detects the internal temperature of the anaerobic fermentation reactor and transmits a temperature signal to the PLC control cabinet. Therefore, the biogas flow meter 131, the constant temperature water bath 63, the temperature sensor 16, the driving motor 21, the inlet valve 111 and the outlet valve 121 are connected to the PLC control cabinet 7, respectively. The stirring rotation speed of the driving motor 21 can be set through the PLC control cabinet 7, the setting range can be 0-60 rpm, and the setting value can achieve an ideal mixing effect according to the properties of the organic garbage materials. Therefore, the PLC control cabinet can transmit related control instructions to each operation unit, such as the stirring rotation speed of the reactor, the fermentation temperature, the feeding and discharging control and the like, and the PLC control cabinet 7 can be responsible for monitoring the overall operation of the circulation type dry anaerobic fermentation system: (1) The stirring rotating speed can be controlled by adjusting the working frequency of the stirring shaft driving motor 21 in the anaerobic fermentation reactor; (2) Receiving real-time temperature data of the anaerobic digestion tank, and controlling the temperature of hot water fed into the reactor water bath jacket 6 by the constant-temperature water bath tank 63 according to a process temperature set value to ensure the fermentation temperature of the anaerobic system to be stable; (3) The anaerobic fermentation reactor is linked with an organic garbage feeding system, and the feeding conveying screw and a feeding port valve 111 are controlled to realize automatic feeding of the anaerobic fermentation reactor; (4) Receiving a metering signal of the biogas flowmeter 131, and accumulating biogas flow data; (5) The working operation conditions of all working units are identified, operation feedback signals of all units are received, such as abnormal unit operation conditions, alarm information, real-time biogas flow, water inlet and outlet temperatures of a constant-temperature water bath tank, basic anaerobic fermentation reactor operation conditions and the like, when abnormal problems of overload torque of a stirring motor, low water level of the constant-temperature water bath tank and the like occur, alarm signals can be sent out (a PLC control cabinet receives the alarm signals, and the alarm is automatically released after the normal state is recovered), so that all working units are protected. The system also has the functions of data storage and calling, and is convenient for inquiring historical data.
After the scheme is adopted, the circulation type dry anaerobic reactor and the circulation type dry anaerobic fermentation system can effectively realize the total mixing anaerobic reaction process of the organic garbage with high solid content, and by designing a two-section positive and negative type propeller blade structure and matching with a cylindrical mixing baffle, the full inoculation of the organic garbage in a tank can be effectively realized, the anaerobic degradation efficiency of the organic garbage is improved, and the total mixing system is beneficial to the degradation load balance of each position in the tank, the overload of local load is avoided, the degradation pressure of anaerobic microbial flora is overlarge, so that the organic garbage treatment capacity of the anaerobic system can be improved, and higher economic benefit is brought.
Compared with the prior art, the invention has the following advantages:
(1) The spiral stirring blade is adopted for the material characteristics of high solid content of the organic garbage, an upper section of reverse blade and a lower section of reverse blade are formed, complete system equipment is matched, the organic garbage of the material fed into the tank can be fully and uniformly mixed with the fermented sludge in the tank, the inoculation effect of the material fed into the tank is ensured, the driving effect of the spiral blade improves the inoculation stability, and therefore, the full degradation of the organic garbage can be ensured, and methane is generated.
(2) The vertical tank body is obviously different from the traditional horizontal plug flow dry anaerobic digestion tank, the spiral stirring blade has better adaptability to high solid content and large-particle-size organic garbage, the spiral stirring blade is axially pushed by the blade surface, the efficiency of conveying fermentation materials is high, the shearing force is smaller, and anaerobic microbial clusters are not easy to damage and the activity of the microbial clusters is reduced.
(3) The full mixing design can avoid overload of local negative organic garbage load in the tank, can accelerate the fermentation efficiency of the organic garbage in the tank and improve the treatment capacity of the organic garbage in the tank.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (8)
1. A loop-type dry anaerobic reactor, characterized in that: the reactor comprises a vertical tank body, a feeding port, a discharging port and a biogas outlet are arranged on the tank body, a rotatable stirring shaft is longitudinally inserted into the tank body in a penetrating manner, a cylindrical mixing baffle is fixedly supported on the outer side of the stirring shaft, and a forward propulsion blade section and a reverse propulsion blade section are respectively arranged at the upper end and the lower end of the stirring shaft and penetrate through the mixing baffle; the forward propulsion blade section and the reverse propulsion blade section respectively comprise blades which form a section of spiral on the stirring shaft, and the directions of the blades in the forward propulsion blade section and the reverse propulsion blade section are opposite; the radius of the blade in the forward propulsion blade section is larger than that of the blade in the reverse propulsion blade section, the forward propulsion blade section is close to the inner wall of the mixing baffle, and a gap is reserved between the reverse propulsion blade section and the inner wall of the mixing baffle.
2. A loop-type dry anaerobic reactor according to claim 1, wherein: the forward pushing area is formed in the propeller blade area of the forward pushing blade section, the reverse pushing area is formed in the propeller blade area of the reverse pushing blade section, the reverse pushing blade section pushes fermentation materials to the top end of the tank, the forced mixing area is formed between the forward pushing area and the reverse pushing area in the mixing baffle, the fermentation materials are conveyed to the bottom of the reactor from the gap between the reverse pushing blade section and the mixing baffle, and then the fermentation materials move to the top of the tank from the outside of the mixing baffle.
3. A loop-type dry anaerobic reactor according to claim 1 or 2, wherein: the rotation direction of the stirring shaft corresponds to the disc rotation rising direction of the blades in the forward propulsion blade section; the blades in the forward propulsion blade section are higher than the upper end of the mixing baffle by at least one screw pitch, and the reverse propulsion blade section extends downwards from the lower end of the mixing baffle to be close to the bottom of the tank body.
4. A loop-type dry anaerobic reactor according to claim 1, wherein: the radius of the blade in the reverse propulsion blade section is 0.8 times of the radius of the blade in the forward propulsion blade section, the height-to-diameter ratio of the tank body is 7.5-8.0, the highest design liquid level is 0.85 times of the height inside the tank body, the solid content of the fed fermented organic garbage is 25-40%, and the solid content of the fermented sludge in the tank is 15-28%.
5. A loop-type dry anaerobic reactor according to claim 1, wherein: the tank body is internally fixed with a supporting seat for supporting a mixing baffle, the diameter of the mixing baffle is 0.5 times of the diameter of the inner side of the tank body, and the volume between the outer side of the mixing baffle and the inner wall of the tank body is 3 times of the volume of the inner side of the mixing baffle.
6. A loop-type dry anaerobic reactor according to claim 1, wherein: the tank body is internally provided with a temperature sensor, the surface of the tank body is also provided with a water bath jacket which can be filled with circulating hot water, a water inlet and a water outlet are arranged in the water bath jacket, and the water inlet and the water outlet are both communicated to a constant-temperature water bath box.
7. A loop-type dry anaerobic reactor according to claim 6, wherein: valves are respectively matched in the feed inlet and the discharge outlet, and one end of the stirring shaft is connected to a driving motor positioned outside the tank body.
8. A circulation type dry anaerobic fermentation system is characterized in that: the circulating current type dry anaerobic reactor comprises the circulating current type dry anaerobic reactor according to claim 7, and further comprises a PLC control cabinet, wherein a biogas flowmeter, a constant temperature water bath box, a temperature sensor, a driving motor and a feed inlet valve are respectively connected to the PLC control cabinet, and a biogas flowmeter is connected to the outside of a biogas outlet of the reactor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118222382A (en) * | 2024-05-24 | 2024-06-21 | 上海安若必科环保科技有限公司 | Dry anaerobic fermentation device |
| CN118638609A (en) * | 2024-08-15 | 2024-09-13 | 中国农业大学三亚研究院 | A system and method for treating organic waste and producing medium-chain carboxylic acids |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118222382A (en) * | 2024-05-24 | 2024-06-21 | 上海安若必科环保科技有限公司 | Dry anaerobic fermentation device |
| CN118638609A (en) * | 2024-08-15 | 2024-09-13 | 中国农业大学三亚研究院 | A system and method for treating organic waste and producing medium-chain carboxylic acids |
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