CN110218644B - Annular-annular interactive integrated anaerobic fermentation reaction device - Google Patents
Annular-annular interactive integrated anaerobic fermentation reaction device Download PDFInfo
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- 238000000855 fermentation Methods 0.000 title claims abstract description 276
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- 238000004321 preservation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention discloses a ring-middle ring interactive integrated anaerobic fermentation reaction device which comprises an outer ring fermentation tank and an inner ring fermentation tank arranged in the outer ring fermentation tank, wherein the outer ring fermentation tank comprises a biogas outlet channel, an outer ring feeding pipe, an outer ring discharging pipe communicated with the bottom of the outer ring fermentation tank and an outer ring bottom plate arranged at the bottom of the outer ring fermentation tank; the inner ring fermentation tank comprises a gas storage cabinet, a biogas outlet channel, an inner ring feeding pipe, an inner ring discharging pipe and an inner ring bottom plate, wherein the gas storage cabinet covers the top end of the inner ring fermentation tank and forms an inner ring biogas production area with the liquid level of the inner ring material; in the vertical direction, the inner ring bottom plate is higher than the outer ring bottom plate, so that the grade sequence of the inner and outer ring fermentation tanks can be switched at will, and the inner ring is used as the main fermentation tank in cold winter or cold areas, thereby effectively avoiding heat loss; the whole fermentation tank body only needs to be designed on the ground, so that the cost of earth excavation engineering is saved.
Description
Technical Field
The invention belongs to the field of anaerobic fermentation systems, and particularly relates to a ring-in-ring interactive integrated anaerobic fermentation reaction device.
Background
Problem 1: at present, the large and medium anaerobic fermentation field utilizes a two-stage anaerobic fermentation process, namely, a two-stage fermentation tank with a ring is used for fermentation simultaneously or two single tanks are connected in series for single operation, and a tank body of advanced materials is usually used as a first-stage fermentation tank, called a main fermentation tank, a secondary fermentation tank of the secondary material (such as a CN201610548828.X patent name: a two-stage integrated anaerobic fermentation method with a ring) and is used as a secondary fermentation tank, about 90% of the fed materials are fermented through the main fermentation tank, and then pumped into the secondary fermentation tank for further fermentation. The two-stage fermentation tank in the ring adopts the outer ring as a first-stage fermentation tank, and the inner ring as a second-stage fermentation tank, and as the bottom plates of the inner ring and the outer ring are designed to be equal in height, the outer ring can pump and discharge materials through the guide pipe on the side wall; the inner ring is positioned at the center and has large area, and the materials entering the inner ring contain a large amount of solid sediments, so that the discharging of the materials is very difficult, the materials can only be used as a secondary fermentation tank without influencing the yield, the outer ring is used as a main fermentation tank, and the two materials cannot be exchanged in design and structure. However, in cold winter or cold areas, the outer ring fermentation tank needs more heating energy to keep the temperature required by anaerobic fermentation, and although the outer ring is provided with a heat preservation layer, heat loss is unavoidable, and the biogas generated by the anaerobic fermentation tank has to be consumed for heating water in a large part, so that the fermentation tank is heated by utilizing the hydraulic heat circulation, and the utilization rate of the final biogas is very low; in addition, because of the difference of climates in each region, the inner and outer two-stage fermentation tanks in cold regions need to be designed into full underground type or partial underground type, and the cost of engineering such as earthwork excavation and the like can be increased. Therefore, if the two-stage fermentation tanks of the inner ring and the outer ring can be switched at will, the inner ring is used as the main fermentation tank, the heat preservation effect is good under the surrounding of the outer ring fermentation tank, and the two-stage fermentation tanks can be arranged on the ground, so that the problems can be solved.
Problem 2: problem 1 the two-stage fermenter in the ring is mentioned, at present, because the top of the inner ring fermenter needs to be equipped with a gas storage membrane, its height often exceeds the outer ring fermenter by about 1 meter, in order to maximize the utilization of the space in the inner ring fermenter and to increase the yield, the liquid level in the inner ring fermenter often exceeds the liquid level of the outer ring fermenter, which can create 2 problems: (1) because the gas produced by the inner ring is collected to the uniform output of the gas producing pipeline of the outer ring, the gas producing pipeline of the inner ring is inevitably higher than the gas producing pipeline of the outer ring in design, so that pressure difference and pressure loss are generated between the gas producing pipeline of the inner ring and the gas producing pipeline of the outer ring, and the gas produced by the inner ring and the gas producing pipeline of the outer ring are simply called as pressure loss, if the outer ring is taken as a main fermentation tank, the gas produced by the inner ring and the gas produced by the outer ring can be smoothly output, but if the inner ring is taken as the main fermentation tank, the biogas produced by the outer ring is difficult to be discharged under the action of the pressure loss, and the random mutual switching of the two-stage fermentation tanks of the inner ring and the outer ring is influenced, so that the random mutual switching of the two-stage fermentation tanks of the inner ring and the outer ring is required, and the problem is also solved. (2) The liquid level pressure difference exists for a long time, so that the pressure generated by the pressure difference on the side wall of the inner ring must be considered when the fermentation tank body is designed, and the design cost of the pressure difference and the safety risk are increased.
Problem 3: problem 1 the two-stage fermenter with annular ring, in which the stirrer is used at present, although the stirrer can be adjusted in position from the vertical direction to stir the material in the fermenter as uniformly as possible, there are 2 problems: (1) at present, the stirrer can only be arranged at a position close to the side wall of the fermentation tank, the central position of the fermentation tank body is difficult to achieve the aim of stirring uniformly, in addition, the outer ring fermentation tank and the inner ring fermentation tank are in a fully-closed state, the top of materials in the fermentation tank are easy to form crust, and the stirrer needs to be lifted to the liquid level position at random for crust breaking treatment; (2) because the gas storage membrane is divided into an inner layer and an outer layer, when the submersible plug flow stirrer is arranged at the top, the biogas collecting device and the plug flow stirrer can be arranged after holes are simultaneously formed in the inner layer membrane and the outer layer membrane of the gas storage membrane, and when the stirrer works, great power can be generated, the connection sealing part of the gas storage membrane can be easily rocked, and the gas storage membrane is sealed and loosened to cause biogas leakage.
Disclosure of Invention
Aiming at the problems, the invention provides a loop-loop interactive integrated anaerobic fermentation reaction device which adopts an inner loop primary-secondary interactive design, an outer loop primary-secondary interactive design, an inner loop lifting bottom plate design, an inner loop liquid level equal-height design, a feeding and discharging hydrodynamic design, a liquid level meter interactive control design and the like, and effectively solves the various problems. The technical scheme is as follows:
an annular interactive integrated anaerobic fermentation reaction device in a ring, comprising:
the outer ring fermentation tank comprises a biogas outlet channel and an outer ring feeding pipe which are communicated with an outer ring biogas production area at the top of the outer ring fermentation tank, an outer ring discharging pipe communicated with the bottom of the outer ring fermentation tank and an outer ring bottom plate arranged at the bottom of the outer ring fermentation tank;
the inner ring fermentation tank is arranged in the outer ring fermentation tank and comprises a gas storage cabinet, a biogas outlet channel, an inner ring feeding pipe, an inner ring discharging pipe and an inner ring bottom plate, wherein the gas storage cabinet covers the top end of the inner ring fermentation tank and forms an inner ring biogas production area with the liquid level of the inner ring material; in the vertical direction, the height of the inner ring bottom plate is higher than that of the outer ring bottom plate;
the inner ring fermentation tank and the outer ring fermentation tank are provided with control components which are used for controlling the inner ring material liquid level and the outer ring material liquid level to be the same in height;
the control part comprises a liquid level meter arranged on the inner ring fermentation tank and/or the outer ring fermentation tank; the flow regulating valves are respectively arranged on the inner ring feeding pipe, the outer ring feeding pipe, the inner ring discharging pipe and the outer ring discharging pipe and are used for controlling the flow of materials in the pipeline; wherein the flowmeter is electrically connected with the flow regulating valve;
the outer ring fermentation tank and the inner ring fermentation tank also comprise a shared top plate which completely covers the top of the outer ring fermentation tank and partially covers the top of the inner ring fermentation tank to form an inner ring annular platform, the inner side edge of the inner ring annular platform is enclosed to form an exhaust port, the top of the exhaust port is provided with a flexible membrane, and the inner ring annular platform, the exhaust port, the flexible membrane and the inner ring material liquid level jointly form the gas storage cabinet; an inner ring platform box body and an outer ring platform box body which are used for placing the stirring device and serving as a methane outlet channel are respectively arranged on the common top plate; the bottom end of the inner ring platform box body is hermetically arranged on the inner ring platform, and the inside of the inner ring platform box body is communicated with the inside of the inner ring fermentation tank body; the bottom end of the outer ring platform box body is hermetically arranged at the top of the outer ring fermentation tank body, and the inside of the outer ring platform box body is communicated with the inside of the outer ring fermentation tank body;
after the inner ring feeding pipe sequentially stretches into the side wall of the outer ring fermentation tank and the side wall of the inner ring fermentation tank, the material in the tank can be pushed to form a spiral flow direction taking the central connecting line of the inner ring fermentation tank as an axis after being discharged along the outlet direction; after the inner ring discharging pipe sequentially stretches into the side wall of the outer ring fermentation tank and the side wall of the inner ring fermentation tank, the material enters the inner ring discharging pipe along the spiral flow direction; after the outer ring feeding pipe stretches into the side wall of the outer ring fermentation tank, the material can be pushed to flow in a spiral direction by taking the central connecting line of the inner ring fermentation tank as an axis after being discharged along the outlet direction; after the outer ring discharging pipe stretches into the side wall of the outer ring fermentation tank, the material enters the outer ring discharging pipe along the spiral flow direction;
the inner ring feeding pipe comprises a first horizontal section and a second horizontal section, wherein the first horizontal section is positioned in the outer ring fermentation tank body, and is bent to form the second horizontal section after extending into the side wall of the inner ring fermentation tank; the inner ring discharging pipe comprises a third horizontal section and a fourth horizontal section, wherein the third horizontal section is positioned in the outer ring fermentation tank body, and is bent to form the fourth horizontal section after extending into the side wall of the inner ring fermentation tank; the feeding direction of the second horizontal section is reversely arranged with the discharging direction of the fourth horizontal section; the outer ring feeding pipe comprises a fifth horizontal section which forms an included angle of 90 degrees with the first horizontal section and is parallel to the second horizontal section; the outer ring discharging pipe comprises a sixth horizontal section which forms an included angle of 90 degrees with the third horizontal section and is parallel to the fourth horizontal section; the feeding direction of the fifth horizontal section is reversely arranged with the discharging direction of the sixth horizontal section;
the inner ring fermentation tank also comprises a plurality of inner ring stirring devices which are arranged in the inner ring fermentation tank and distributed along the circumferential direction of the inner ring fermentation tank, and the inner ring stirring devices comprise inner ring stirring guide rods and inner ring stirrers, wherein the upper ends of the inner ring stirring guide rods are arranged on the inner ring platform box body, the lower ends of the inner ring stirring guide rods are fixed at the bottom of the inner ring fermentation tank body, and the inner ring stirrers can slide up and down and are circumferentially and rotationally arranged on the inner ring stirring guide rods; the outer ring fermentation tank also comprises a plurality of outer ring stirring devices which are arranged in the outer ring fermentation tank and distributed along the circumferential direction of the outer ring fermentation tank, and the outer ring stirring devices comprise outer ring stirring guide rods and outer ring stirrers, wherein the upper ends of the outer ring stirring guide rods are arranged on the outer ring platform box body, the lower ends of the outer ring stirring guide rods are fixed at the bottom of the outer ring fermentation tank body, and the outer ring stirrers can slide up and down and are circumferentially and rotatably arranged on the outer ring stirring guide rods;
at least 1 inner ring stirring device is arranged between the shortest distance between the inlet of the inner ring feeding pipe and the inlet of the inner ring discharging pipe; at least 1 outer ring stirring device is arranged between the shortest distance of the connection line between the outlet of the outer ring feeding pipe and the inlet of the outer ring discharging pipe;
an inner ring temperature sensor and an outer ring temperature sensor for monitoring the inner ring fermentation tank and the outer ring fermentation tank are respectively arranged on the common top plate;
preferably, the distance between the cross section of the inner ring bottom plate and the cross section of the outer ring bottom plate is 0.5-2 m;
a platform box body connecting pipe is arranged between the inner ring platform box body and the outer ring platform box body, and biogas generated by the inner ring fermentation tank is discharged after entering the platform box body connecting pipe through the inner ring platform box body and being converged with biogas generated by the outer ring fermentation tank;
an inner ring liquid level gauge and an outer ring liquid level gauge are respectively arranged on the inner ring fermentation tank and the outer ring fermentation tank, and flow regulating valves are respectively arranged on the inner ring feeding pipe, the outer ring feeding pipe, the inner ring discharging pipe and the outer ring discharging pipe and used for controlling the material flow in the pipeline; the inner ring liquid level meter is electrically connected with the flow regulating valve on the inner ring feeding pipe and the inner ring discharging pipe, when the inner ring liquid level meter detects that the liquid level of the inner ring fermentation tank is higher than a preset value, information is fed back to the flow regulating valve, the inner ring feeding pipe stops feeding, and the inner ring discharging pipe starts discharging; when the liquid level detected by the inner ring liquid level meter is lower than a preset value, information is fed back to the flow regulating valve, the inner ring feeding pipe starts feeding, and the inner ring discharging pipe stops discharging;
the outer ring liquid level meter is electrically connected with the outer ring feeding pipe and the flow regulating valve on the outer ring discharging pipe, when the outer ring liquid level meter detects that the liquid level of the outer ring fermentation tank is higher than a preset value, information is fed back to the flow regulating valve, the outer ring feeding pipe stops feeding, and the outer ring discharging pipe starts discharging; when the liquid level detected by the outer ring liquid level meter is lower than a preset value, information is fed back to the flow regulating valve, the outer ring feeding pipe starts feeding, and the outer ring discharging pipe stops discharging; the inner ring liquid level gauge and the outer ring liquid level gauge are both provided with the same high-level and low-level preset values.
Preferably, the width of the annular ring of the inner annular platform is 2 m-4 m.
Advantageous effects
Compared with the prior art, the invention has the following advantages:
1) The bottom plate of the inner ring fermentation tank is higher than the bottom plate of the outer ring fermentation tank, so that the inner ring fermentation tank can smoothly discharge materials, and the inner ring can be used as a main fermentation tank, namely, the two-stage fermentation tanks of the inner ring and the outer ring can be switched at will; in cold winter or cold areas, the inner ring is used as the main fermentation tank, so that heat loss is effectively avoided, and meanwhile, the whole fermentation tank body is only designed on the ground, so that the cost of earthwork excavation engineering is saved.
2) The liquid level in the inner ring and the liquid level in the inner ring are ensured to approach to be consistent in real time through controlling feeding and discharging by the liquid level meter in the inner ring and the outer ring, namely, no pressure difference exists between the inner ring and the outer ring, so that the problem that biogas generated by the outer ring is difficult to remove under the action of pressure loss when the inner ring is used as a main fermentation tank is solved, and the inner ring and the outer ring two-stage fermentation tanks can be switched with each other at will; meanwhile, the inner ring and the outer ring have no pressure difference, so that the design cost of the pressure difference is saved, and the safety risk is reduced; in addition, the material liquid levels in the inner ring fermentation tank and the outer ring fermentation tank are nearly identical, so that the inner ring fermentation tank and the outer ring fermentation tank only need to be provided with one liquid level meter respectively, even if one liquid level meter breaks down, the other liquid level meter can replace the other liquid level meter, and the design only needs to be provided with 2 liquid level meters, so that the cost is saved. Because the prior ring middle-ring two-stage fermentation tank is independent in the control of the liquid level of the inner ring and the outer ring due to different liquid levels of the inner ring and the outer ring when the fermentation tank runs at full load, for example, when a liquid level meter in the fermentation tank of the inner ring fails, a liquid level meter can not be used for monitoring a high liquid level during feeding or a low liquid level during discharging, and one liquid level meter is usually needed to be added for one preparation, so that the fermentation tank of the inner ring and the outer ring needs 4 liquid level meters in total, and the cost investment is increased.
3) The second horizontal section on the inner ring feeding pipe and the fourth horizontal section on the inner ring discharging pipe are reversely arranged; the fifth horizontal section on the outer ring feeding pipe and the sixth horizontal section on the outer ring discharging pipe are reversely arranged, so that the hydrodynamic principle is skillfully utilized, the inflow power of the material inlet and the outflow power of the material outlet are beneficial to the formation of spiral flow direction of the material in the tank, the self stirring of the material is promoted, the load of the stirrer is reduced, and the top material crust is prevented.
4) At least 1 inner ring stirring device is arranged between the shortest distance between the inlet of the inner ring feeding pipe and the inlet of the inner ring discharging pipe; at least 1 outer ring stirring device is arranged between the shortest distance of the connection line between the outlet of the outer ring feeding pipe and the inlet of the outer ring discharging pipe; when the material is fed, the height and the pushing direction of the stirrer are adjusted to be consistent with the flowing power direction of the material inlet, so that the spiral flow direction of the material in the tank is promoted, the self stirring of the material is promoted, the load of the stirrer is reduced, and the top material is prevented from crusting.
5) The top of the outer ring fermentation tank and the top of the inner ring fermentation tank are provided with a shared top plate, and particularly, the design of the inner ring annular platform is realized, only the gas collecting device and the stirring device are required to be arranged on the inner ring annular platform, and holes are not required to be formed in the flexible membrane, so that the risk of biogas leakage is reduced, and meanwhile, an operation space is provided for installation and maintenance of the stirring device.
Drawings
FIG. 1 shows a schematic structure of an anaerobic fermentation reaction apparatus of the present invention;
FIG. 2 shows a top view of the anaerobic fermentation reaction apparatus of the present invention;
FIG. 3 shows a schematic A-A cross-sectional structure of the anaerobic fermentation reaction apparatus of the present invention in FIG. 2;
FIG. 4 shows a schematic structural view of an inner ring feed pipe, an outer ring feed pipe, an inner ring discharge pipe, and an outer ring discharge pipe.
In the figure: 1-an outer ring fermentation tank; 1-1 an outer ring feed tube; 1-1-1-fifth horizontal segment; 1-2 of an outer ring discharging pipe; 1-2-1-sixth horizontal segment; 1-3-an outer ring base plate; 1-4-outer ring level gauge; 1-5 parts of an outer ring platform box body; 1-6-an outer ring stirring device; 1-6-1-outer ring stirring guide rod; 1-6-2-outer ring stirrer; 1-7 of an outer ring temperature sensor; 2-an inner loop fermenter; 2-1-inner ring feed tube; 2-1-1-a first horizontal segment; 2-1-2-second horizontal segment; 2-2-inner ring discharging pipe; 2-2-1-third horizontal segment; 2-2-2-fourth horizontal segment; 2-3-inner ring bottom plate; 2-4-gas storage cabinets; 2-4-1-inner ring annular platforms; 2-4-2-exhaust port; 2-4-3-flexible film; 2-5-inner ring liquid level meter; 2-6-inner ring material level; 2-7-inner ring platform box body; 2-8-inner ring stirring device; 2-8-1-inner ring stirring guide rod; 2-8-2-inner ring stirrer; 2-9 inner ring temperature sensors; 3-a platform box connecting pipe.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in fig. 1 to 4, a loop-in-loop interactive integrated anaerobic fermentation reaction device comprises:
the outer ring fermentation tank 1 comprises a biogas outlet channel and an outer ring feeding pipe 1-1 which are communicated with an outer ring biogas production area at the top of the outer ring fermentation tank, an outer ring discharging pipe 1-2 which is communicated with the bottom of the outer ring fermentation tank, and an outer ring bottom plate 1-3 which is arranged at the bottom of the outer ring fermentation tank;
an inner ring fermentation tank 2 arranged inside the outer ring fermentation tank, which comprises a gas storage cabinet 2-4 covering the top end of the inner ring fermentation tank and forming an inner ring biogas production area between the inner ring fermentation tank and an inner ring material liquid level 2-6, a biogas outlet channel and an inner ring feeding pipe 2-1 which are communicated with the inner ring biogas production area at the top of the inner ring fermentation tank, an inner ring discharging pipe 2-2 communicated with the bottom of the inner ring fermentation tank, and an inner ring bottom plate 2-3 arranged at the bottom of the inner ring fermentation tank; in the vertical direction, the height of the inner ring bottom plate is higher than that of the outer ring bottom plate. The bottom plate of the inner ring fermentation tank is higher than the bottom plate of the outer ring fermentation tank, so that the inner ring fermentation tank can smoothly discharge materials, and the inner ring can be used as a main fermentation tank, namely, the two-stage fermentation tanks of the inner ring and the outer ring can be switched at will; in cold winter or cold areas, the inner ring is used as the main fermentation tank, so that heat loss is effectively avoided, and meanwhile, the whole fermentation tank body is only designed on the ground, so that the cost of earthwork excavation engineering is saved.
In order to solve the problem caused by the pressure difference of the inner and outer ring fermenters in the process of arbitrarily exchanging primary and secondary fermentation modes of the inner and outer ring two-stage fermenters, the inner ring fermenters 2 and the outer ring fermenters 1 are provided with control components for controlling the inner ring material liquid level and the outer ring material liquid level to be the same in height; the control part comprises a liquid level meter arranged on the inner ring fermentation tank 2 and/or the outer ring fermentation tank 1; the flow regulating valves are respectively arranged on the inner ring feeding pipe, the outer ring feeding pipe, the inner ring discharging pipe and the outer ring discharging pipe and are used for controlling the flow of materials in the pipeline; wherein the flowmeter is electrically connected with the flow regulating valve.
There are two cases:
(1) When the inner ring fermentation tank 2 and the outer ring fermentation tank 1 are provided with liquid level meters, the following conditions are that: the inner ring fermentation tank 2 and the outer ring fermentation tank 1 are respectively provided with an inner ring liquid level meter 2-5 and an outer ring liquid level meter 1-4, and flow regulating valves are arranged on the inner ring feeding pipe, the outer ring feeding pipe, the inner ring discharging pipe and the outer ring discharging pipe and used for controlling the material flow in the pipeline; the inner ring liquid level meter is electrically connected with the flow regulating valve on the inner ring feeding pipe and the inner ring discharging pipe, and when the inner ring liquid level meter detects that the liquid level of the inner ring fermentation tank is higher than a preset value, information is fed back to the flow regulating valve to stop feeding; when the liquid level detected by the inner ring liquid level meter is lower than a preset value, information is fed back to the flow regulating valve to start feeding; the outer ring liquid level meter is electrically connected with the flow regulating valve on the outer ring feeding pipe and the outer ring discharging pipe, and when the outer ring liquid level meter detects that the liquid level of the outer ring fermentation tank is higher than a preset value, information is fed back to the flow regulating valve to stop feeding; when the liquid level detected by the outer ring liquid level meter is lower than a preset value, information is fed back to the flow regulating valve to start feeding; the inner ring liquid level gauge and the outer ring liquid level gauge are both provided with the same high-level and low-level preset values, so that the approach consistency of the liquid levels of the materials of the inner ring and the outer ring can be ensured in real time.
In addition, when one of the inner ring fermentation tank or the outer ring fermentation tank fails, the materials of the inner ring and the outer ring are not affected, and the normal operation can be continued. Taking the failure of the inner ring liquid level meter as an example, the method is specifically described as follows: the volumes of the outer ring fermentation tank body and the inner ring fermentation tank body are equal, and the fermentation time is equal, so that the ring liquid levels in the inner ring fermentation tank and the outer ring fermentation tank are always approximately consistent from the moment of normal operation, and the liquid level monitoring data in the inner ring fermentation tank and the outer ring fermentation tank are shared by a PLC control system; when the fermentation tank device normally operates, the feeding amount of the outer ring fermentation tank is the same as that of the inner ring fermentation tank, and the discharging amount of the outer ring fermentation tank is the same as that of the inner ring fermentation tank; when the inner ring liquid level meter is out of order, the PLC control system of the anaerobic fermentation reaction device can display 0, a judging program is programmed in the program, if the data monitored by the inner ring liquid level meter and the outer ring liquid level meter are unequal, and the inner ring liquid level meter is 0, the PLC control system can assign the detection data displayed by the outer ring liquid level meter to the inner ring liquid level meter, so that the data of the inner ring liquid level meter and the data of the outer ring liquid level meter are completely consistent, and at the moment, the inner ring liquid level meter still has the monitoring data conveyed by the outer ring liquid level meter although the inner ring liquid level meter is out of order, and the monitoring data can be continuously fed back to the flow regulating valves on the inner ring feeding pipe and the inner ring discharging pipe, so that feeding and discharging are controlled normally. If the outer ring level gauge fails, the same is true.
Because the material liquid level in the inner ring fermentation tank and the outer ring fermentation tank approaches to be consistent, the inner ring fermentation tank and the outer ring fermentation tank only need to be provided with one liquid level meter respectively, even if one liquid level meter breaks down, the other liquid level meter can replace the other liquid level meter, and the design only needs to be provided with 2 liquid level meters, so that the cost is saved. Because the prior ring middle-ring two-stage fermentation tank is independent in the control of the liquid level of the inner ring and the outer ring due to different liquid levels of the inner ring and the outer ring when the fermentation tank runs at full load, for example, when a liquid level meter in the fermentation tank of the inner ring fails, a liquid level meter can not be used for monitoring a high liquid level during feeding or a low liquid level during discharging, and one liquid level meter is usually needed to be added for one preparation, so that the fermentation tank of the inner ring and the outer ring needs 4 liquid level meters in total, and the cost investment is increased.
When the liquid level meter is arranged in only 1 fermentation tank on the inner ring fermentation tank 2 and the outer ring fermentation tank 1:
as in the case of the principle of failure of the liquid level meter in one of the fermentation tanks in the case (1), for example, the liquid level meter is only installed in the outer ring fermentation tank, and since the volumes of the outer ring fermentation tank body and the inner ring fermentation tank body are equal, the fermentation time is equal, so that the feeding amount of the outer ring fermentation tank and the feeding amount of the inner ring fermentation tank are the same from the moment of normal operation, the discharging amount of the outer ring fermentation tank and the discharging amount of the inner ring fermentation tank are the same, and therefore, the ring liquid levels in the inner ring fermentation tank and the outer ring fermentation tank are always nearly the same, and therefore, only 1 liquid level meter is needed to be arranged. There is a problem in that if the gauge malfunctions, the normal operation of the fermenter is affected, so that it is preferable to provide the gauges in both the inner ring fermenter and the outer ring fermenter.
The outer ring fermentation tank and the inner ring fermentation tank also comprise a shared top plate which completely covers the top of the outer ring fermentation tank and partially covers the top of the inner ring fermentation tank to form an inner ring annular platform 2-4-1, the inner side edge of the inner ring annular platform is surrounded to form an exhaust port 2-4-2, the top of the exhaust port is provided with a flexible membrane 2-4-3, and the inner ring annular platform, the exhaust port, the flexible membrane and the inner ring material liquid 2-6 positions jointly form the gas storage cabinet; an inner ring platform box body 2-7 and an outer ring platform box body 1-5 which are used for placing a stirring device and serving as a methane outlet channel are respectively arranged on the common top plate; the bottom end of the inner ring platform box body is hermetically arranged on the inner ring platform, and the inside of the inner ring platform box body is communicated with the inside of the inner ring fermentation tank body; the bottom end of the outer ring platform box body is hermetically arranged at the top of the outer ring fermentation tank body, and the inside of the outer ring platform box body is communicated with the inside of the outer ring fermentation tank body.
The top of the outer ring fermentation tank and the top of the inner ring fermentation tank are provided with the shared top plate, particularly the design of the inner ring annular platform, only the gas collecting device and the stirring device are required to be arranged on the inner ring annular platform, holes are not required to be formed in the flexible membrane, the risk of biogas leakage is reduced, and meanwhile, an operation space is provided for installation and maintenance of the stirring device.
After the inner ring feeding pipe 2-1 sequentially stretches into the side wall of the outer ring fermentation tank and the side wall of the inner ring fermentation tank, the material in the tank can be pushed to form a spiral flow direction taking the central connecting line of the inner ring fermentation tank as an axis after being discharged along the outlet direction; after the inner ring discharging pipe 2-2 sequentially stretches into the side wall of the outer ring fermentation tank and the side wall of the inner ring fermentation tank, the material enters the inner ring discharging pipe along the spiral flow direction; after the outer ring feeding pipe 1-1 stretches into the side wall of the outer ring fermentation tank, the material can be pushed to flow in a spiral direction by taking the central connecting line of the inner ring fermentation tank as an axis after being discharged along the outlet direction; after the outer ring discharging pipe 1-2 stretches into the side wall of the outer ring fermentation tank, the material enters the outer ring discharging pipe along the spiral flow direction. The design ingenious utilizes the fluid mechanics principle, the inflow power of the material inlet and the outflow power of the material outlet are beneficial to the spiral flow direction of the material in the tank, the self stirring of the material is promoted, the load of the stirrer is reduced, and the top material crust is prevented.
As a more preferable specific embodiment, the maximized material in the promoting tank forms a spiral flow direction, and the inner ring feeding pipe 2-1 comprises a first horizontal section 2-1-1 and a second horizontal section 2-1-2, wherein the first horizontal section is positioned in the outer ring fermentation tank body, and is bent to form the second horizontal section after extending into the side wall of the inner ring fermentation tank; the inner ring discharging pipe 2-2 comprises a third horizontal section 2-2-1 and a fourth horizontal section 2-2-2, wherein the third horizontal section is positioned in the outer ring fermentation tank body, extends into the side wall of the inner ring fermentation tank and is bent to form the fourth horizontal section; the feeding direction of the second horizontal section is reversely arranged with the discharging direction of the fourth horizontal section;
the outer ring feeding pipe 1-1 comprises a fifth horizontal section 1-1-1 which forms an included angle of 90 degrees with the first horizontal section and is parallel to the second horizontal section; the outer ring discharging pipe 1-2 comprises a sixth horizontal section 1-2-1 which forms an included angle of 90 degrees with the third horizontal section and is parallel to the fourth horizontal section; the feeding direction of the fifth horizontal section is reversely arranged with the discharging direction of the sixth horizontal section.
In order to promote the material in the tank to form a spiral flow direction, the self stirring of the material is realized, the load of the stirrer is reduced, and the top material is prevented from crusting. The inner ring fermentation tank also comprises a plurality of inner ring stirring devices 2-8 which are arranged in the inner ring fermentation tank and distributed along the circumferential direction of the inner ring fermentation tank, and the inner ring stirring devices comprise inner ring stirring guide rods 2-8-1 and inner ring stirrers 2-8-2, wherein the upper ends of the inner ring stirring guide rods are arranged on an inner ring platform box body, the lower ends of the inner ring stirring guide rods are fixed at the bottom of the inner ring fermentation tank body, and the inner ring stirrers can slide up and down and are circumferentially and rotatably arranged on the inner ring stirring guide rods; the outer ring fermentation tank also comprises a plurality of outer ring stirring devices 1-6 which are arranged in the outer ring fermentation tank and distributed along the circumferential direction of the outer ring fermentation tank, wherein the outer ring stirring devices comprise an outer ring stirring guide rod 1-6-1 and an outer ring stirrer 1-6-2, the upper end of the outer ring stirring guide rod is arranged on the outer ring platform box body, the lower end of the outer ring stirring guide rod is fixed at the bottom of the outer ring fermentation tank body, and the outer ring stirrer can slide up and down and is arranged on the outer ring stirring guide rod in a circumferential rotation manner; at least 1 inner ring stirring device is arranged between the shortest distance between the inlet of the inner ring feeding pipe and the inlet of the inner ring discharging pipe; at least 1 outer ring stirring device is arranged between the shortest distance of the connection line between the inlet of the outer ring feeding pipe and the inlet of the outer ring discharging pipe. When the material is fed, the height and the pushing direction of the stirrer are adjusted to be consistent with the flowing power direction of the material inlet, so that the spiral flow direction of the material in the tank is promoted, the self stirring of the material is promoted, the load of the stirrer is reduced, and the top material is prevented from crusting.
In order to better monitor the temperature conditions in the inner ring fermentation tank and the outer ring fermentation tank, the common top plate is respectively provided with an inner ring temperature sensor 2-9 and an outer ring temperature sensor 1-7 for monitoring the inner ring fermentation tank and the outer ring fermentation tank.
In order to conveniently collect the biogas generated in the inner ring fermentation tank and the outer ring fermentation tank, a platform tank connecting pipe 3 is arranged between the inner ring platform tank and the outer ring platform tank, and the biogas generated in the inner ring fermentation tank enters the platform tank connecting pipe through the inner ring platform tank and is discharged after being converged with the biogas generated in the outer ring fermentation tank.
In this embodiment, the distance between the cross section of the inner ring bottom plate and the cross section of the outer ring bottom plate may be 0.5-2 meters; the width of the annular ring of the inner annular platform can be 2 m-4 m.
The flow regulating valve in the invention can be a knife gate valve; the inner ring feeding pipe, the outer ring feeding pipe, the inner ring discharging pipe and the outer ring discharging pipe are linked through the pump group.
The above examples are only preferred embodiments of the present invention, it being noted that: it will be apparent to those skilled in the art that several modifications and equivalents can be made without departing from the principles of the invention, and such modifications and equivalents fall within the scope of the invention.
Claims (2)
1. The utility model provides a cyclic annular interactive integration anaerobic fermentation reaction unit which characterized in that includes:
the outer ring fermentation tank (1) comprises a biogas outlet channel and an outer ring feeding pipe (1-1) which are communicated with an outer ring biogas production area at the top of the outer ring fermentation tank, an outer ring discharging pipe (1-2) which is communicated with the bottom of the outer ring fermentation tank, and an outer ring bottom plate (1-3) which is arranged at the bottom of the outer ring fermentation tank;
the inner ring fermentation tank (2) is arranged in the outer ring fermentation tank and comprises a gas storage cabinet (2-4) which covers the top end of the inner ring fermentation tank and forms an inner ring biogas production area with the inner ring material liquid level (2-6), a biogas outlet channel and an inner ring feeding pipe (2-1) which are communicated with the inner ring biogas production area at the top of the inner ring fermentation tank, an inner ring discharging pipe (2-2) which is communicated with the bottom of the inner ring fermentation tank, and an inner ring bottom plate (2-3) which is arranged at the bottom of the inner ring fermentation tank; in the vertical direction, the height of the inner ring bottom plate is higher than that of the outer ring bottom plate;
the inner ring fermentation tank (2) and the outer ring fermentation tank (1) are provided with control components which are used for controlling the inner ring material liquid level and the outer ring material liquid level to be the same in height; the control part comprises a liquid level meter arranged on the inner ring fermentation tank (2) and/or the outer ring fermentation tank (1); the flow regulating valves are respectively arranged on the inner ring feeding pipe, the outer ring feeding pipe, the inner ring discharging pipe and the outer ring discharging pipe and are used for controlling the flow of materials in the pipeline; wherein the flowmeter is electrically connected with the flow regulating valve;
the outer ring fermentation tank and the inner ring fermentation tank also comprise a shared top plate which completely covers the top of the outer ring fermentation tank and partially covers the top of the inner ring fermentation tank to form an inner ring annular platform (2-4-1), the inner side edge of the inner ring annular platform is surrounded with an exhaust port (2-4-2), the top of the exhaust port is provided with a flexible membrane (2-4-3), and the inner ring annular platform, the exhaust port, the flexible membrane and the inner ring material liquid level (2-6) jointly form the gas storage cabinet; an inner ring platform box body (2-7) and an outer ring platform box body (1-5) for placing the stirring device and serving as a methane outlet channel are respectively arranged on the common top plate; the bottom end of the inner ring platform box body is hermetically arranged on the inner ring platform, and the inside of the inner ring platform box body is communicated with the inside of the inner ring fermentation tank body; the bottom end of the outer ring platform box body is hermetically arranged at the top of the outer ring fermentation tank body, and the inside of the outer ring platform box body is communicated with the inside of the outer ring fermentation tank body; after the inner ring feeding pipe (2-1) sequentially stretches into the side wall of the outer ring fermentation tank and the side wall of the inner ring fermentation tank, the material in the tank can be pushed to form a spiral flow direction taking the central connecting line of the inner ring fermentation tank as an axis after being discharged along the outlet direction; after the inner ring discharging pipe (2-2) sequentially stretches into the side wall of the outer ring fermentation tank and the side wall of the inner ring fermentation tank, the material enters the inner ring discharging pipe along the spiral flow direction;
after the outer ring feeding pipe (1-1) stretches into the side wall of the outer ring fermentation tank, the material can be pushed to flow in a spiral direction by taking the central connecting line of the inner ring fermentation tank as an axis after being discharged along the outlet direction; after the outer ring discharging pipe (1-2) stretches into the side wall of the outer ring fermentation tank, the material enters the outer ring discharging pipe along the spiral flow direction; the inner ring feeding pipe (2-1) comprises a first horizontal section (2-1-1) and a second horizontal section (2-1-2), wherein the first horizontal section is positioned in the outer ring fermentation tank body, extends into the side wall of the inner ring fermentation tank and is bent to form the second horizontal section; the inner ring discharging pipe (2-2) comprises a third horizontal section (2-2-1) and a fourth horizontal section (2-2-2), wherein the third horizontal section is positioned in the outer ring fermentation tank body, is bent to form the fourth horizontal section after extending into the side wall of the inner ring fermentation tank, and the feeding direction of the second horizontal section is reversely arranged with the discharging direction of the fourth horizontal section;
the outer ring feeding pipe (1-1) comprises a fifth horizontal section (1-1-1), which forms an included angle of 90 degrees with the first horizontal section and is parallel to the second horizontal section; the outer ring discharging pipe (1-2) comprises a sixth horizontal section (1-2-1), which forms an included angle of 90 degrees with the third horizontal section and is parallel to the fourth horizontal section; the feeding direction of the fifth horizontal section is reversely arranged with the discharging direction of the sixth horizontal section;
the inner ring fermentation tank also comprises a plurality of inner ring stirring devices (2-8) which are arranged in the inner ring fermentation tank and distributed along the circumferential direction of the inner ring fermentation tank, and the inner ring stirring devices comprise inner ring stirring guide rods (2-8-1) and inner ring stirrers (2-8-2), wherein the upper ends of the inner ring stirring guide rods are arranged on an inner ring platform box body, the lower ends of the inner ring stirring guide rods are fixed at the bottom of the inner ring fermentation tank body, and the inner ring stirrers can slide up and down and are circumferentially and rotatably arranged on the inner ring stirring guide rods;
the outer ring fermentation tank also comprises a plurality of outer ring stirring devices (1-6) which are arranged in the outer ring fermentation tank and distributed along the circumferential direction of the outer ring fermentation tank, and the outer ring stirring devices comprise an outer ring stirring guide rod (1-6-1) and an outer ring stirrer (1-6-2), wherein the upper end of the outer ring stirring guide rod is arranged on the outer ring platform box body, the lower end of the outer ring stirring guide rod is fixed at the bottom of the outer ring fermentation tank body, and the outer ring stirrer can slide up and down and is circumferentially and rotatably arranged on the outer ring stirring guide rod; at least 1 inner ring stirring device is arranged between the shortest distance between the inlet of the inner ring feeding pipe and the inlet of the inner ring discharging pipe; at least 1 outer ring stirring device is arranged between the shortest distance of the connection line between the outlet of the outer ring feeding pipe and the inlet of the outer ring discharging pipe;
an inner ring temperature sensor (2-9) and an outer ring temperature sensor (1-7) for monitoring the inner ring fermentation tank and the outer ring fermentation tank are respectively arranged on the common top plate;
the distance between the cross section of the inner ring bottom plate and the cross section of the outer ring bottom plate is 0.5-2 m;
a platform box body connecting pipe (3) is arranged between the inner ring platform box body and the outer ring platform box body, and biogas generated by the inner ring fermentation tank is discharged after entering the platform box body connecting pipe through the inner ring platform box body and being converged with biogas generated by the outer ring fermentation tank;
the inner ring fermentation tank (2) and the outer ring fermentation tank (1) are respectively provided with an inner ring liquid level meter (2-5) and an outer ring liquid level meter (1-4), and flow regulating valves are arranged on the inner ring feeding pipe, the outer ring feeding pipe, the inner ring discharging pipe and the outer ring discharging pipe and used for controlling the material flow in the pipeline; the inner ring liquid level meter is electrically connected with the flow regulating valve on the inner ring feeding pipe and the inner ring discharging pipe, when the inner ring liquid level meter detects that the liquid level of the inner ring fermentation tank is higher than a preset value, information is fed back to the flow regulating valve, the inner ring feeding pipe stops feeding, and the inner ring discharging pipe starts discharging; when the liquid level detected by the inner ring liquid level meter is lower than a preset value, information is fed back to the flow regulating valve, the inner ring feeding pipe starts feeding, and the inner ring discharging pipe stops discharging;
the outer ring liquid level meter is electrically connected with the outer ring feeding pipe and the flow regulating valve on the outer ring discharging pipe, when the outer ring liquid level meter detects that the liquid level of the outer ring fermentation tank is higher than a preset value, information is fed back to the flow regulating valve, the outer ring feeding pipe stops feeding, and the outer ring discharging pipe starts discharging; when the liquid level detected by the outer ring liquid level meter is lower than a preset value, information is fed back to the flow regulating valve, the outer ring feeding pipe starts feeding, and the outer ring discharging pipe stops discharging; the inner ring liquid level gauge and the outer ring liquid level gauge are both provided with the same high-level and low-level preset values.
2. The anaerobic fermentation reaction apparatus according to claim 1, wherein: the width of the annular ring of the inner annular platform is 2 m-4 m.
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