Dry-type super-energy-saving biogas system capable of realizing industrial efficient and safe production

Abstract

A fermentation tank in the dry-type super-energy-saving industrial efficient and safe production biogas system comprises a tank top, a tank body and a tank bottom, the top end of a central stand column connected with the tank bottom extends upwards into the tank body, and the middle of the central stand column is sleeved with a stirring disc in running fit with the central stand column; the two sides of the tank body are each provided with a feeding groove, a driving pulley is arranged above each feeding groove, a feeding opening is formed in the portion, close to the top end of the feeding groove, of the side wall of each feeding groove, the bottom end of each feeding groove is communicated with the interior of the tank body through a bent pipe, and a steering pulley is arranged in each bent pipe; the feeding rope sequentially winds around the left driving pulley, the left steering pulley, the stirring disc, the right steering pulley and the right driving pulley to form a closed loop, and the middle of the feeding rope is wound around the side wall of the stirring disc to generate linkage rotating force. According to the design, the requirement for fermentation raw materials is low, the gas production efficiency is high, two-side feeding is linked with the stirring disc by utilizing the balance balance labor-saving principle, stirring does not need an extra motor, energy is saved, and the overall energy consumption is very small.

Description

Technical Field

[0001] The invention relates to a process for generating biogas by utilizing straw, belongs to the field of biogas, and in particular to a dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production. Background Art

[0002] Large and medium-sized biogas engineering technology is a rural energy engineering technology that develops and utilizes agricultural waste, obtains energy and controls environmental pollution, and realizes a virtuous cycle of agricultural ecology. The biogas process used in domestic research and development is mainly CSTR process engineering.

[0003] The CSTR (Continuous Stirred Tank Reactor), also known in the industry as the "complete mixing" type, operates primarily based on anaerobic biological treatment technology. Under anaerobic conditions, microorganisms (methanogens) convert organic matter into biogas (primarily composed of methane and carbon dioxide) and other metabolites through fermentation. In operation, liquid feedstock (concentration below 8%) enters the fermenter from the middle and upper part (i.e., pump feed) and is then stirred by a propeller to thoroughly mix with the microorganisms within the reactor (some of the new feed is wasted by short-circuiting through the overflow during the mixing process). The reactor is then heated to an appropriate temperature, enabling the microorganisms to efficiently degrade the organic matter, generating biogas. Finally, the generated biogas is discharged from the top of the reactor and, after purification, can be used as an energy source. Simultaneously, treated wastewater overflows from the top of the reactor and is discharged. However, in addition to the aforementioned drawback of wasteful "short-circuiting" discharge through the overflow pipe during the mixing process between the feedstock and microorganisms, this design also suffers from the following major drawbacks: First, the design places high demands on the fermentation feedstock. The input fermentation feedstock can only be liquid, with a solid content of 8% or less, otherwise it is easy to clog and entangle the system. The straw commonly used as a biogas fermentation feedstock is relatively long (about 10cm in length after being crushed while harvesting), making it difficult to achieve this 8% solid content and length (1-2cm). This is unless the straw is crushed into a sandy powder at the factory. However, this not only increases energy consumption and labor costs, but also poses the risk of dust explosions. Secondly, this design needs to mix new and old materials when feeding. Not only do feeding and stirring require separate energy consumption, but the power consumption of the motors used for feeding and stirring tools is also very high. The power of the motors equipped with large-scale vertical stirring and feeding equipment requires 15-20 kilowatts each. What's more, there are multiple small stirring motors installed on the side walls of the tank, which further increases the overall power consumption. Not only that, the motor must be repaired in the tank by emptying thousands of cubic meters of fermentation material before it can be repaired. After the repair is completed, thousands of cubic meters of material and bacteria must be fed again to restart. The entire production needs to be stopped for more than three months before it can be restarted, which is very troublesome.

[0004] The information disclosed in this background technology section is only intended to increase understanding of the overall background of the application and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects and problems of the prior art in that the requirements for fermentation raw materials are high and the overall energy consumption for feeding and stirring is large, and to provide a dry, ultra-energy-saving, industrially scalable, efficient and safe biogas system that has low requirements for fermentation raw materials and low overall energy consumption for feeding and stirring.

[0006] To achieve the above objectives, the technical solution of the present invention is: a dry, ultra-energy-saving, industrially scalable, efficient, and safe biogas system, comprising a fermentation tank, a feed trough, a feed rope, and a stirrer. The fermentation tank comprises a tank body, a tank top, and a tank bottom connected thereto. The tank bottom is a frustum structure that is wide at the top and narrow at the bottom. The bottom surface of the tank bottom is connected to the bottom end of a central column, the top end of the central column extends upward into the interior of the tank body, and a stirrer is sleeved in the middle of the central column and rotatably cooperates with the central column. A vertical feed trough is provided on each of the left and right sides of the can body, a driving pulley is provided above the feed trough, the top of the feed trough is higher than the top of the can, a feed port is provided on the side wall of the feed trough near the top, the bottom end of the feed trough is connected to one end of a bent pipe, the other end of the bent pipe penetrates the can body and communicates with the interior of the can body, and a steering pulley is provided inside the bent pipe; The feed rope is sequentially wound around the driving pulley above the left feed trough, the steering pulley in the left bend pipe, the stirring plate, the steering pulley in the right bend pipe, and the driving pulley above the right feed trough to form a closed loop. A pressing plate is respectively provided on the parts of the feed rope near the left and right feed ports. The pressing plate is located in the corresponding feed trough, and the middle part of the feed rope is wrapped around the side of the stirring plate.

[0007] The top of the feed trough on the left is connected to the top of the feed trough on the right through two I-beams. A pulley base is fixed on the I-beam near both ends to support the corresponding driving pulley, and a driving wheel motor is provided next to the driving pulley on the right to rotate with it.

[0008] A cable drum is provided on the feed trough at a position higher than the feed port. The outer end of the cable wound on the cable drum is connected to the feeding cart. The feeding cart reciprocates up and down along the inclined slide. The top of the inclined slide is connected to the feed port, and the bottom end of the inclined slide extends downward at an angle.

[0009] The bottom surface of the tank bottom is connected to the bottom of the sand receiving pool at a position close to the central column. The top of the sand receiving pool is connected to the bottom end of the sand receiving tray. The top end of the sand receiving tray extends obliquely upward until it is connected to the other end of the bent pipe. The side of the sand receiving pool is connected to one end of the sand discharge pipe, and the other end of the sand discharge pipe is connected to the sand storage pool outside the fermentation tank after passing through the tank body, and a sand control valve is provided on the sand discharge pipe at the position outside the fermentation tank.

[0010] The width of the sand receiving tray increases gradually from low to high.

[0011] The bottom of the tank bottom is connected to one end of the biogas liquid pipe, and the other end of the biogas liquid pipe passes through the tank bottom and is connected to the bacteria supplementation liquid pump, biogas liquid tank, and concentrated liquid tank outside the fermentation tank, and a liquid control valve is provided on each pipeline to the bacteria supplementation liquid pump, biogas liquid tank, and concentrated liquid tank; The output end of the bacteria supplementation liquid pump is connected to one end of the bacteria supplementation liquid pipe, and the other end of the bacteria supplementation liquid pipe is connected to the nozzle, and the liquid outlet of the nozzle is arranged higher than the feed inlet.

[0012] The top of the central column is inserted and connected with the middle of the top bearing, the middle of the central column is inserted and connected with the middle of the middle bearing, the bottom of the top bearing is connected to the top of the middle bearing via a rotating cylinder, the rotating cylinder is sleeved on the outside of the central column, and the middle of the stirring disk is sleeved on the side of the rotating cylinder; The bottom of the stirring disc is connected to the portion of the rotating drum near the middle bearing through at least two oblique support ribs; the stirring disc and the oblique support ribs are both connected to a stirring chain extending downward, and the top of the stirring disc is connected to a plurality of upper stirring plates extending upward; The tank top includes a fixed cover and a floating cover located inside the fixed cover, the fixed cover includes a top fixing ring, a side connecting ring and a bottom supporting ring, and the floating cover includes a cover side periphery and a cover top surface connected to the top of the floating cover; The outer side of the top fixing ring is connected to the top of the can body, the inner side of the top fixing ring is connected to the top of the side connecting ring, the bottom of the side connecting ring is connected to the outer side of the bottom supporting ring, and the cover side surround is directly above the top surface of the bottom supporting ring, and the bottom area of the cover side surround is larger than the area of the inner ring surface of the bottom supporting ring; There are multiple slag outlets on the top surface of the cover, and the top of a slag outlet vertical pipe is connected directly below each slag outlet. The bottom end of the slag outlet vertical pipe is connected to the inner end of the slag outlet horizontal pipe, and the outer end of the slag outlet horizontal pipe extends toward the side of the cover.

[0013] All slag outlets are arranged along the same diameter on the top surface of the cover. An inspection port is opened in the middle of the diameter. The outer ends of all slag outlet horizontal pipes on the same side of the inspection port are oriented in the same direction, and the outer ends of the slag outlet horizontal pipes on the left side of the inspection port are oriented in the opposite direction to the outer ends of the slag outlet horizontal pipes on the right side of the inspection port. A slag pushing slide rail is suspended above all slag outlets on the left or right side, and a slag pushing car is provided on the slag pushing slide rail for reciprocating sliding with it. Slag pushing baffles are provided on both sides of the slag pushing slide rail. The slag pushing cavity formed by the slag pushing baffles is communicated with the inner end of the slag pressing cavity provided on the top fixing ring. The slag pressing cavity is formed by two slag pressing baffles, and a slag pressing device is provided in the slag pressing cavity. The outer end of the slag pressing cavity is connected to the conveyor belt.

[0014] The bottom of the inspection port is connected to the top of the inspection pipe, and the bottom of the inspection pipe is connected to the rotating side of the air blocking plate through a hinge. The area of the air blocking plate is greater than or equal to the area of the bottom of the inspection pipe. The part of the air blocking plate away from the rotating side is connected to the bottom end of the door chain, and the top end of the door chain passes through the inspection pipe and the inspection port in sequence and extends upward.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In a dry-type, ultra-energy-saving, industrially applicable, efficient, and safe biogas system of the present invention, the fermentation raw materials used for fermentation enter the feed trough from the feed port, and then enter the bottom of the fermentation tank from the bottom of the feed trough. The specific process is as follows: when it is necessary to enter from the feed port on the left, the driving pulley on the left is first driven to rotate to pull up the feed rope and the pressing plate below it. At the same time, under the effect of the balance of the scale, the feed rope below the driving pulley on the right is lowered, and the pressing plate connected thereto is driven to press down the fermentation raw materials previously input from the feed port on the right until the pressing plate on the left When the rising height is higher than the feed port, the movement of the feed rope is stopped, and then the fermentation raw materials are fed into the feed trough from the feed port on the left. After the feeding is completed, the driving pulley on the left is driven to rotate in the opposite direction to lower the feed rope and the pressing plate, thereby pressing down the fermentation raw materials just fed into the feed trough to enter the fermentation tank. Then, when the pressing plate on the right side rises higher than the feed port, the movement of the feed rope is stopped, and the fermentation raw materials are fed into the feed port on the right. This cycle is repeated, so that the fermentation raw materials are fed into the feed ports on the left and right sides in turn. The advantages of this design include: First, the present invention utilizes the balance effect of a scale to feed materials alternately from the left and right feed ports. This allows the feeder to only need to provide energy to drive the pulley (usually driven by a small motor with a power of only 3 kilowatts, while the feed motors in the prior art each have a power of at least 20 kilowatts). This provides just a little power to break the balance of the scale, greatly reducing the energy consumption for feeding. Second point: When the left and right feed ports are fed alternately, the feed ropes under the left and right drive pulleys will continue to rise and fall, and the feed rope is a closed loop as a whole, which is a whole rope. Therefore, this rising and lowering switching will drive the stirring plate to continuously rotate counterclockwise and clockwise, thereby stirring and mixing the materials in the fermentation tank (including old residual materials and newly input new materials) to improve the uniformity of the mixing (an upper stirring plate and a stirring chain can also be added to expand the stirring effect) and concentration, so that the concentration of anaerobic fermentation reaches 25%, while the existing technology is mostly less than 8%, which is beneficial to subsequent fermentation and gas production. At the same time, this system is a high-concentration dry fermentation without secondary sewage discharge, while traditional low-concentration wet fermentation has a large amount of secondary sewage discharge. In addition, the entire stirring process does not require an additional power source and only exists due to the feeding operation, thereby greatly reducing the stirring energy consumption, which is 3 to 6 times lower than the existing process. Third point: The fermentation raw materials in the present invention first enter from the feed port near the top of the tank, and then are pressed into the bottom of the fermentation tank from the bottom of the feed trough by the downward pressure of the pressing plate and the gravity of the fermentation raw materials themselves, and then are stirred by the stirring plate to disperse and mix. This feeding method reduces the composition requirements of the fermentation raw materials and is not limited to liquid. The solid content can be as high as 50%, and it is not easy to clog. At the same time, it does not require the solids in the raw materials to be in a granular state, and the length can be no more than 10 cm (the traditional technology requires 1-2 cm, which requires secondary crushing). It is 2 to 5 times lower than the existing process requirements. It is particularly suitable for dry-wet mixed or pure dry fermentation raw materials with straw as the main component. The downward pressure feeding method can also overcome the property characteristics of straw that is easy to float; Fourth point: The existing CSTR process feeds from the middle and upper part of the fermenter, and it takes a process from feeding to fermentation and gas production. Therefore, this feeding method will cause excess new material to flow out from the overflow port, resulting in it flowing out before participating in the generation of biogas, causing waste and forming a feed short-circuit phenomenon. In the present invention, the new material finally enters the fermenter from the bottom, not only does it not cause the feed short-circuit phenomenon, but also can be mixed with the supplementary bacterial liquid at the beginning of entry. At this time, the new material that has been aerobically composted can quickly produce biogas after contacting the bacterial liquid, greatly shortening the gas production time and improving the efficiency of the fermenter. Therefore, the present invention not only has lower requirements on fermentation raw materials and a wider range of applications, but also has lower overall energy consumption for feeding and stirring and higher gas production efficiency.

[0016] 2. In the dry, ultra-energy-saving, industrially scalable, efficient, and safe biogas system of the present invention, the fermentation tank preferably comprises a tank body and a tank top and a tank bottom connected thereto. The tank bottom is a truncated cone structure that is wide at the top and narrow at the bottom. Therefore, the concentration of the biogas slurry is highest at the tank bottom. To this end, this design outputs the concentrated biogas slurry to the outside through a biogas slurry pipe, which has the following advantages: First, concentrated biogas slurry can be moved to the top of the feed port through the feed pump, feed pipe, and nozzle in sequence to spray the incoming feed. This allows for mixing of high-concentration (50%) new feed with the biogas slurry at the very beginning of the feed, while instantly diluting the 50% concentration to the same level as the 20% fermentation concentration in the tank. This significantly shortens the fermentation time. Furthermore, the newly-input feed is alkaline in nature, achieving acid-base balance after spraying, which is more conducive to subsequent fermentation and gas production. Second, the biogas pipe is also connected to the biogas tank and the concentrated liquid tank outside the fermentation tank. Once the concentrated biogas is too much, the pressure in the fermentation tank will increase. At this time, the liquid control valve will be opened (preferably a one-way valve structure), thereby inputting the concentrated liquid into the biogas tank and the concentrated liquid tank for storage and subsequent reuse. Therefore, the present invention not only diversifies the utilization of biogas slurry, but also improves gas production efficiency.

[0017] 3. In a dry-type, ultra-energy-saving, industrially scalable, and safe biogas system, the present invention provides a system in which fermentation raw materials are often mixed with impurities of relatively high density, such as sand, when they are input. Since sand has a higher density than the fermentation raw materials, when the fermentation raw materials enter the fermentation tank along the sand receiving tray, the impurities of relatively high density will sink onto the sand receiving tray and slide down the inclined sand receiving tray into the sand receiving pool for storage. Subsequently, when the sand in the sand receiving pool needs to be removed, the sand discharge pipe only needs to be opened. Under the action of water pressure, the sand in the sand receiving pool will automatically be discharged out of the fermentation tank along the sand discharge pipe, which is not only convenient but also highly efficient. Therefore, the present invention can not only remove impurities of relatively high density in the raw materials, but also efficiently transport the impurities out of the fermentation tank.

[0018] 4. In a dry-type, ultra-energy-saving, industrially applicable, efficient and safe biogas system of the present invention, the tank top preferably includes a fixed cover and a floating cover located therein, wherein the fixed cover includes a top fixing ring, a side connecting ring and a bottom supporting ring, and the floating cover includes a cover side enclosure and a cover top surface connected to the top thereof; the outer side edge of the top fixing ring is connected to the top of the tank body, the inner side edge of the top fixing ring is connected to the top of the side connecting ring, the bottom of the side connecting ring is connected to the outer side edge of the bottom supporting ring, and the cover side enclosure is directly above the top surface of the bottom supporting ring, and the bottom area of the cover side enclosure is larger than the area of the inner ring surface of the bottom supporting ring. At the same time, a plurality of slag outlets are provided on the cover top surface, and the top end of a slag discharge vertical pipe is connected to the corresponding bottom of each slag outlet, the bottom end of the slag discharge vertical pipe is connected to the inner end of the slag discharge horizontal pipe, and the outer end of the slag discharge horizontal pipe extends toward the direction close to the cover side enclosure; When the fermentation tank is generating biogas through fermentation, the tank is divided into a biogas liquid area, a mixing area, a slag layer and a gas storage area from bottom to top. Among them, the slag layer (the main component of the fermentation raw material used in this design is mostly straw, and straw has the characteristic of floating upwards, so the slag in the slag layer is mainly composed of fermented straw) and the gas storage area are both located at the top of the tank. Since biogas has the characteristic of vertical rise, the generated biogas is blocked by the bottom support ring and will not overflow or escape. At the same time, the biogas lifts up the floating cover (after being lifted up, the height of the floating cover remains basically unchanged), so that it is suspended above the bottom support ring. Subsequently, the floating cover is driven to rotate to stir the slag layer, so that the slag in the slag layer is discharged to the top surface of the cover along the slag discharge horizontal pipe, the slag discharge vertical pipe and the slag discharge port in the order of discharge to facilitate subsequent slag discharge. The advantages of this design include: First point: slag discharge can be carried out directly on the slag accumulation layer, and the slag discharge operation does not affect the gas storage area. Slag discharge and gas storage do not interfere with each other, and the slag discharge efficiency is high; Second point: slag discharge depends on the rotation of the floating cover, and the floating cover is suspended above the bottom support ring, which is easy to operate and has low power consumption; The third point: when the floating hood rotates, it can be rotated clockwise and counterclockwise at intervals to improve the efficiency of discharging slag from the slag outlet, especially when all the slag outlets are arranged along the same diameter on the top surface of the hood, and the outer end of the slag discharge horizontal pipe on the left side of the inspection port is facing in the opposite direction to the outer end of the slag discharge horizontal pipe on the right side of the inspection port, the slag discharged to the top surface of the hood will be arranged in a row along the diameter. At this time, it is more efficient to remove the slag along the diameter direction. For example, a slag pushing slide is suspended above the diameter, and the slag pushing slide is equipped with a slag pushing car that slides back and forth. When the slag accumulates to a certain extent on the top surface of the hood, the rotation of the top surface of the hood is stopped first, and then the slag pushing car is driven to slide back and forth along the slag pushing slide to push the slag into the slag pressing chamber, compressed by the slag pressing device, and then sent to the conveyor belt for direct transportation. It is very convenient and fast, and is especially suitable for large-scale biogas production. Fourth point: When the fermentation concentration in the tank is lower than the designed fermentation concentration, the slag cannot be discharged. At this time, the float cover only needs to rotate in the opposite direction to achieve a single stirring function instead of discharging slag. Therefore, the present invention not only has high slag discharge efficiency and low energy consumption, but also has a high degree of automation, and is suitable for large-scale biogas production.

[0019] 5. In a dry-type, ultra-energy-saving, industrially applicable, efficient, and safe biogas system of the present invention, the fixed cover preferably includes a top fixing ring, a side connecting ring, and a bottom supporting ring, and the floating cover includes a cover side enclosure and a cover top surface connected to the top thereof, wherein the outer side edge of the top fixing ring is connected to the top of the tank body, the inner side edge of the top fixing ring is connected to the top of the side connecting ring, the bottom of the side connecting ring is connected to the outer side edge of the bottom supporting ring, and the cover side enclosure is directly above the top surface of the bottom supporting ring. The bottom area of the cover side enclosure is larger than the area of the inner ring surface of the bottom supporting ring, and the biogas has the characteristic of vertical rise. Therefore, the generated biogas is blocked by the bottom supporting ring and will not overflow, but will only accumulate below the top fixing ring and the cover top surface to form a gas storage area. At this time, one end of the biogas pipe is connected to the interior of the floating cover, and the biogas The other end of the air pipe passes through the bottom support ring and the side connection ring in sequence, and then passes upward from the top fixing ring. It is equipped with an air control valve that realizes the constant pressure function, so that the generated biogas can be smoothly sent to the gas holder. At the same time, in order to prevent the biogas from exploding, a constant pressure water tank connected to the tank is added. The water tank is provided with an overflow pipe and a water level controller. When the biogas pressure in the tank increases, the water level of the connected water tank increases, and the overflow port can discharge the overpressure overflow water at any time; when the biogas pressure in the tank decreases, the water level of the connected water tank decreases. At this time, the water level controller is used to start the water supply pump to pump the biogas from the biogas pool into the tank, which can play the role of water supply and constant pressure. It can be seen that this design does not need to add an overpressure redundant protection device, and can realize the functions of timely explosion prevention and constant pressure. Therefore, the present invention not only does not interfere with each other in gas storage, constant pressure, and slag discharge, but also has a good explosion-proof effect.

[0020] 6. In a dry-type, ultra-energy-saving, industrially-available, efficient, and safe biogas system of the present invention, a cable drum is preferably provided at a position above the feed port on the feed trough, the outer end of the cable wound on the cable drum is connected to a feeding car, and the feeding car reciprocates up and down along the inclined slide, the top of the inclined slide is connected to the feed port, and the bottom end of the inclined slide extends downwardly at an angle. When used, the feeding car is controlled by a cable to reciprocate up and down along the inclined slide, wherein, when ascending to the feed port, the feeding car is tilted to pour the fermentation material therein into the feed port, and then the cable is loosened to lower the empty feeding car to the next loading point, thereby loading new fermentation material into the feeding car, and then the feeding car is pulled upward to feed the feed port, and the cycle is carried out in sequence. Therefore, the feeding operation of the present invention is efficient and suitable for assembly line feeding operation.

[0021] 7. In a dry, ultra-energy-saving, industrially scalable, efficient, and safe biogas system, the bottom of the inspection port is preferably connected to the top of the inspection pipe, the bottom of the inspection pipe is connected to the rotating side of the gas blocking plate via a hinge, the area of the gas blocking plate is greater than or equal to the area of the bottom of the inspection pipe, the portion of the gas blocking plate away from the rotating side is connected to the bottom end of the door chain, the top end of the door chain passes through the inspection pipe and the inspection port in sequence and extends upward. During use, when no maintenance is required, the gas blocking plate tightly seals the bottom of the inspection pipe to prevent biogas from overflowing. When maintenance is required in the fermenter, the fermenter is first stopped and the biogas is emptied, and then the door chain is lowered to allow the rotating side to rotate around the bottom of the inspection pipe via the hinge, thereby opening the bottom of the inspection pipe. Then, a flexible ladder is lowered to enter the fermenter through the bottom port for maintenance. Therefore, the present invention is not only convenient for maintenance, but also does not interfere with maintenance and biogas storage.

[0022] 8. In the dry-type, ultra-energy-saving, industrially applicable, efficient and safe biogas system of the present invention, the main component of the fermentation raw material is preferably straw, especially straw after aerobic composting (preferably straw and livestock and poultry manure). The temperature of the aerobic composting material is relatively high, about 60 degrees. At this time, when it enters the fermentation tank, it will not lower the temperature of the material in the tank, and can act as a heat source to maintain the temperature of the entire tank at about 53 degrees. Therefore, under the action of the above series of measures, gas can be produced on the second day after the new material enters (in the field of biogas fermentation, gas can be produced when the temperature is above 15 degrees). Unlike the traditional existing technology, the new material entering is at room temperature. Once the material is fed, the temperature in the tank will drop, affecting the gas production efficiency. It takes at least three or four days to produce gas, especially in winter, when the room temperature is lower, resulting in no gas production. In addition, the preferred aerobic composting raw material of the present invention can also save heating energy, without the need to burn coal, biogas, or electricity for heating, and there is zero energy consumption for heating. Therefore, the present invention not only has a fast gas production speed, but also has two elements of ultra-high gas production rate recognized in textbooks: "high temperature and high concentration", and can also save heating energy consumption and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 yes Figure 1 Top view of .

[0025] Figure 3 yes Figure 1 Top view of the central sand table.

[0026] Figure 4 yes Figure 1 Enlarged schematic diagram of the middle stirring plate.

[0027] Figure 5 yes Figure 1 Top view of the middle stirring plate.

[0028] Figure 6 It is a structural schematic diagram of the floating cover in the present invention.

[0029] Figure 7 yes Figure 6 Schematic diagram of the connection between the middle slag discharge vertical pipe and the slag discharge horizontal pipe.

[0030] Figure 8 yes Figure 6 Enlarged schematic diagram of the constant pressure water tank.

[0031] Figure 9 yes Figure 6 Top view of .

[0032] Figure 10 yes Figure 9 Schematic diagram of the structure of the middle inspection pipe.

[0033] Figure 11 It is a side view of the feed chute in the present invention.

[0034] Figure 12 yes Figure 11 Top view of .

[0035] Figure 13 It is a schematic structural diagram of the inner tank top in Example 10 of the present invention.

[0036] Figure 14 yes Figure 13 Schematic diagram of the structure of the middle floating cover.

[0037] Figure 15 yes Figure 14 Schematic diagram of the structure of the clamp cavity in the middle tube.

[0038] In the figure: feed rope 1, fermentation tank 2, tank top 21, tank body 22, horizontal connecting pipe 221, vertical connecting pipe 222, constant pressure water tank 223, water level controller 224, overflow pipe 225, tank bottom 23, fixed cover 24, top fixing ring 241, side connecting ring 242, bottom supporting ring 243, driving gear 244, inner vertical ring 245, fixed ring groove 246, floating cover 25, cover side 251, cover top surface 252, driving rack 253, lifting ring 254, biogas pipe 26, gas control valve 261, fixed Seat 27, support ramp 28, feed trough 3, drive pulley 31, I-beam 311, pulley base 312, drive wheel motor 313, feed port 32, elbow 33, guide plate 331, diverter pulley 34, feeding car 35, cable drum 351, inclined slide 352, pressing plate 36, feed I-beam 361, one-way pressing plate 362, stirring plate 4, friction partition 40, plate area 401, plateless area 402, upper rope groove 403, lower rope groove 404, center column 41, top bearing 42, middle bearing 43, reinforcing reinforcement 431, rotating drum 44, oblique support rib 45, stirring chain 46, upper stirring plate 47, sand receiving pool 5, sand receiving table 51, sand discharge pipe 52, sand storage pool 53, sand control valve 54, biogas pipe 6, bacteria supplementation liquid pump 61, biogas tank 62, concentrated liquid tank 63, liquid control valve 64, bacteria supplementation liquid pipe 65, nozzle 66, slag outlet 7, slag discharge vertical pipe 71, outer pipe wall 711, inner pipe wall 712, bottom pipe ring 713, pipe inner cavity 714, air seal 715, slag discharge horizontal pipe 72, inspection port 7 3. Slag pushing car 8, slag pushing rail 81, slag pushing baffle 82, slag pushing chamber 83, slag pressing chamber 84, slag pressing baffle 85, slag pressing device 86, conveyor belt 87, inspection pipe 9, loose-leaf 91, bottom left edge 911, bottom right edge 912, air blocking plate 92, rotating side edge 921, door chain 922, left slag inspection port 93, left slag inspection pipe 931, slag inlet 932, right slag inspection port 94, right slag inspection pipe 941, stirring horizontal plate 95, angle steel 951, ladder 96, side wall glass 10, top glass 11. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] See also Figure 1 — Figure 12 A dry, ultra-energy-saving, industrially scalable, efficient, and safe biogas system comprises a fermentation tank 2, a feed trough 3, a feed rope 1, and a stirrer 4. The fermentation tank 2 comprises a tank body 22, a tank top 21, and a tank bottom 23 connected thereto. The tank bottom 23 is a truncated cone structure that is wide at the top and narrow at the bottom. The bottom surface of the tank bottom 23 is connected to the bottom end of a central column 41. The top end of the central column 41 extends upward into the interior of the tank body 22. A stirrer 4 is sleeved in the middle of the central column 41 and rotatably cooperates with the central column 41. A vertical feed chute 3 is provided on each of the left and right sides of the can body 22. A driving pulley 31 is provided above the feed chute 3. The top of the feed chute 3 is higher than the can top 21. A feed port 32 is provided on the side wall of the feed chute 3 near the top. The bottom end of the feed chute 3 is connected to one end of a curved pipe 33. The other end of the curved pipe 33 penetrates the can body 22 and communicates with the interior of the can body 22. A deflecting pulley 34 is provided inside the curved pipe 33. The feed rope 1 is sequentially wound around the driving pulley 31 above the left feed trough 3, the steering pulley 34 in the left curved pipe 33, the stirring plate 4, the steering pulley 34 in the right curved pipe 33, and the driving pulley 31 above the right feed trough 3 to form a closed loop. A pressing plate 36 is respectively provided on the part of the feed rope 1 near the left and right feed ports 32. The pressing plate 36 is located in the corresponding feed trough 3, and the middle part of the feed rope 1 is wrapped around the side of the stirring plate 4.

[0041] The top of the left feed trough 3 is connected to the top of the right feed trough 3 via two I-beams 311. A pulley base 312 is fixed near the two ends of the I-beam 311 to support the corresponding driving pulley 31, and a driving motor 313 is provided next to the right driving pulley 31 to rotate with it.

[0042] A cable drum 351 (preferably an intelligent electric cable drum) is provided on the feed trough 3 at a position higher than the feed port 32. The outer end of the cable wound on the cable drum 351 is connected to the feeding cart 35. The feeding cart 35 reciprocates up and down along the inclined slide 352. The top end of the inclined slide 352 is connected to the feed port 32, and the bottom end of the inclined slide 352 extends downward at an angle.

[0043] The bottom surface of the tank bottom 23 near the central column 41 is connected to the bottom of the sand receiving pool 5, and the top of the sand receiving pool 5 is connected to the bottom end of the sand receiving tray 51. The top end of the sand receiving tray 51 extends obliquely upward until it is connected to the other end of the elbow 33. The side of the sand receiving pool 5 is connected to one end of a sand discharge pipe 52, and the other end of the sand discharge pipe 52 passes through the tank body 22 and is connected to a sand storage pool 53 located outside the fermentation tank 2. A sand control valve 54 is provided on the sand discharge pipe 52 at a location outside the fermentation tank 2. The width of the sand receiving tray 51 gradually increases from bottom to top.

[0044] The bottom of the tank bottom 23 is connected to one end of the biogas liquid pipe 6. The other end of the biogas liquid pipe 6 passes through the tank bottom 23 and is connected to the supplementary liquid pump 61, biogas liquid tank 62, and concentrated liquid tank 63 located outside the fermentation tank 2. A liquid control valve 64 is provided on each of the pipelines leading to the supplementary liquid pump 61, biogas liquid tank 62, and concentrated liquid tank 63. The output end of the supplementary liquid pump 61 is connected to one end of the supplementary liquid pipe 65. The other end of the supplementary liquid pipe 65 is connected to a nozzle 66, and the liquid outlet of the nozzle 66 is arranged higher than the feed inlet 32.

[0045] The top of the central column 41 is inserted and connected to the middle of the top bearing 42, and the middle of the central column 41 is inserted and connected to the middle of the middle bearing 43. The bottom of the top bearing 42 is connected to the top of the middle bearing 43 via a rotating cylinder 44. The rotating cylinder 44 is sleeved on the outside of the central column 41, and the middle of the stirring disk 4 is sleeved on the side of the rotating cylinder 44. The bottom of the stirrer 4 is connected to the portion of the rotating drum 44 near the middle bearing 43 via at least two oblique support ribs 45. A downwardly extending stirring chain 46 is connected to both the stirrer 4 and the oblique support ribs 45. A plurality of upwardly extending upper stirring plates 47 are connected to the top of the stirrer 4. The tank top 21 includes a fixed cover 24 and a floating cover 25 located inside the fixed cover 24. The fixed cover 24 includes a top fixing ring 241, a side connecting ring 242 and a bottom supporting ring 243. The floating cover 25 includes a cover side 251 and a cover top surface 252 connected to the top of the floating cover 25. The outer edge of the top fixing ring 241 is connected to the top of the tank body 22, the inner edge of the top fixing ring 241 is connected to the top of the side connecting ring 242, the bottom of the side connecting ring 242 is connected to the outer edge of the bottom supporting ring 243, and the cover side wall 251 is directly above the top surface of the bottom supporting ring 243, and the bottom area of the cover side wall 251 is larger than the area of the inner ring surface of the bottom supporting ring 243; a plurality of slag outlets 7 are provided on the cover top surface 252, and the top end of a slag outlet vertical pipe 71 is connected directly below each slag outlet 7, the bottom end of the slag outlet vertical pipe 71 is connected to the inner end of the slag outlet horizontal pipe 72, and the outer end of the slag outlet horizontal pipe 72 extends toward the direction close to the cover side wall 251.

[0046] All the slag outlets 7 are arranged along the same diameter on the top surface 252 of the cover, and an inspection port 73 is opened in the middle of the diameter. The outer ends of all the slag discharge transverse pipes 72 on the same side of the inspection port 73 are in the same direction, and the outer ends of the slag discharge transverse pipes 72 on the left side of the inspection port 73 are in the opposite direction to the outer ends of the slag discharge transverse pipes 72 on the right side of the inspection port 73; a slag pushing slide rail 81 is suspended above all the slag outlets 7 on the left or right side, and a slag pushing car 8 is provided on the slag pushing slide rail 81 for reciprocating sliding with it. Slag pushing baffles 82 are respectively provided on both sides of the slag pushing slide rail 81, and a slag pushing cavity 83 formed by the slag pushing baffles 82 is communicated with the inner end of the slag pressing cavity 84 provided on the top fixing ring 241. The slag pressing cavity 84 is formed by clamping two slag pressing baffles 85. A slag pressing device 86 is provided in the slag pressing cavity 84, and the outer end of the slag pressing cavity 84 is connected to the conveyor belt 87.

[0047] The bottom of the inspection port 73 is connected to the top of the inspection pipe 9, and the bottom of the inspection pipe 9 is connected to the rotating side 921 of the air blocking plate 92 through the hinge 91. The area of the air blocking plate 92 is greater than or equal to the area of the bottom of the inspection pipe 9. The part of the air blocking plate 92 away from the rotating side is connected to the bottom end of the door chain 922, and the top end of the door chain 922 passes through the inspection pipe 9 and the inspection port 73 in sequence and then extends upward.

[0048] The supplementary technical features of the present invention are as follows: In the present invention, a plurality of lifting rings 254 are preferably provided on the top of the cover top surface 252 , so that the floating cover 25 can be lifted by the lifting rings 254 to perform other operations, such as installing the floating cover 25 .

[0049] In the preferred embodiment of the present invention, the side of the bearing 43 is connected to the inner ends of four reinforcing ribs 431, the outer ends of which are connected to the inner wall of the can body 22. The four reinforcing ribs 431 are evenly arranged along the same circumference. These four reinforcing ribs 431 can stabilize both the central column 41 and the can body 22.

[0050] The present invention preferably installs sealed side wall glass 10 and top glass 11 on the south side of the tank body 22 and the tank top 21 to utilize solar energy, which can both increase temperature and keep warm without increasing energy consumption, and increase temperature at zero cost.

[0051] In the present invention, a fixing seat 27 is preferably provided on the bottom surface of the tank bottom 23. The bottom end of the fixing seat 27 is located below the tank bottom 23, and the top end of the fixing seat 27 extends into the interior of the tank bottom 23 to connect with the bottom end of the central column 41. On this basis, it is further preferred that a supporting slope 28 is provided below the side of the tank bottom 23. The supporting slope 28 is preferably formed by secondary pouring of concrete.

[0052] Example 1: See also Figure 1 — Figure 12 , a dry, ultra-energy-saving, industrially efficient and safe biogas system, comprising a fermentation tank 2, a feed trough 3, a feed rope 1 and a stirrer 4. The fermentation tank 2 comprises a tank body 22 and a tank top 21 and a tank bottom 23 connected thereto. The tank bottom 23 is a truncated cone structure that is wide at the top and narrow at the bottom. The bottom surface of the tank bottom 23 is connected to the bottom end of the central column 41, and the top of the central column 41 extends upward to the interior of the tank body 22 (preferably, the height of the top of the central column 41 is one-third of the tank body 22). A stirrer 4 that rotates with the central column 41 is sleeved in the middle of the central column 41; an upright feed trough 3 is provided on the left and right sides of the tank body 22, and a driving pulley 31 is provided above the feed trough 3. The top of the feed trough 3 is higher than The tank top 21 is provided, and a feed port 32 is provided on the side wall of the feed trough 3 near its top. The bottom end of the feed trough 3 is connected to one end of the curved pipe 33, and the other end of the curved pipe 33 penetrates the tank body 22 and communicates with the interior of the tank body 22. A steering pulley 34 is provided inside the curved pipe 33; the feed rope 1 is sequentially wound around the driving pulley 31 above the left feed trough 3, the steering pulley 34 in the left curved pipe 33, the stirring plate 4, the steering pulley 34 in the right curved pipe 33, and the driving pulley 31 above the right feed trough 3 to form a closed loop, and a pressing plate 36 is respectively provided on the feed rope 1 near the left and right feed ports 32. The pressing plate 36 is located in the corresponding feed trough 3, and the middle part of the feed rope 1 is wrapped around the side of the stirring plate 4.

[0053] In actual application, based on the volume of the fermentation tank 2, the present invention produces 2.0-4.0 cubic meters of gas per cubic meter, while the traditional CSTR process produces 0.2-0.5 cubic meters. Compared with the traditional CSTR process, the gas production efficiency of the present invention is very high, which will also reduce the volume requirement of the fermentation tank 2. Compared with the traditional process, the volume of the fermentation tank can be reduced by 2 to 4 times for the same gas production, thereby saving the floor space of the entire biogas system, and reducing the floor space, investment amount and maintenance rate by 4 to 6 times compared with the traditional CSTR process.

[0054] Example 2: The basic content is the same as Example 1, except that: The pressing plate 36 includes a feed I-beam 361 and at least one one-way pressure plate 362 sleeved thereon, the top end of the feed I-beam 361 is connected to the portion of the feed rope 1 close to the feed port 32, the bottom end of the feed I-beam 361 is connected to the portion of the feed rope 1 close to the steering pulley 34, the side of the feed I-beam 361 is connected to the inner end of the one-way pressure plate 362, the outer end of the one-way pressure plate 362 extends outward, and the one-way pressure plate 362 and the feed I-beam 361 are both located in the feed trough 3. During use, when the feed rope 1 is lowered, the feed I-beam 361 and the one-way pressure plate 362 move downward together, and the outer end of the one-way pressure plate 362 is blocked by its bottom surface and opens from a closed state to an expanded state to press down the fermentation raw materials. When the feed rope 1 is raised, the feed I-beam 361 and the one-way pressure plate 362 move upward together. At this time, the outer end of the one-way pressure plate 362 is blocked by its top surface and closes from an expanded state to a closed state, making it easier to move upward.

[0055] Example 3: The basic content is the same as Example 1, except that: An arc-shaped friction baffle 40 is attached to the middle of the side of the stirrer 4. The arc of this friction baffle 40 is less than 360 degrees, which is greater than the rotational travel required for feeding. The friction baffle 40 divides the plate area 401 where it is located into an upper rope groove 403 and a lower rope groove 404. The area of the stirrer 4 side without the friction baffle 40 is a plate-free area 402. The feed rope 1 is wound sequentially through the upper rope groove 403, the plate-free area 402, the lower rope groove 404, and the plate-free area 402 to complete the winding of the stirrer 4 side. In use, the friction baffle 40 prevents the feed rope 1 from rubbing against itself.

[0056] Example 4: The basic content is the same as Example 1, except that: The bottom surface of the tank bottom 23 is connected to the bottom of the sand receiving pool 5 at a position close to the central column 41. The top of the sand receiving pool 5 is connected to the bottom end of the sand receiving tray 51. The top of the sand receiving tray 51 extends upward at an angle until it is connected to the other end of the elbow 33. The side of the sand receiving pool 5 is connected to one end of the sand discharge pipe 52. The other end of the sand discharge pipe 52 passes through the tank body 22 and is connected to the sand storage pool 53 outside the fermentation tank 2. A sand control valve 54 is provided on the sand discharge pipe 52 at a position outside the fermentation tank 2. It is further preferred that an upward guide plate 331 is provided above the sand receiving tray 51 , the lower end of the guide plate 331 is connected to the other end of the curved pipe 33 , and the upper end of the guide plate 331 is provided close to the stirring plate 4 .

[0057] Example 5: The basic content is the same as Example 1, except that: The tank top 21 includes a fixed cover 24 and a floating cover 25 located inside the fixed cover 24. The fixed cover 24 includes a top fixing ring 241, a side connecting ring 242 and a bottom supporting ring 243. The floating cover 25 includes a cover side 251 and a cover top surface 252 connected to the top of the tank body 22. The outer side of the top fixing ring 241 is connected to the top of the side connecting ring 242, and the bottom of the side connecting ring 242 is connected to the bottom supporting ring 243. 3 is connected, the cover side 251 is located just above the top surface of the bottom supporting ring 243, and the bottom area of the cover side 251 is larger than the area of the inner ring surface of the bottom supporting ring 243; a plurality of slag outlets 7 are provided on the cover top surface 252, and the top end of a slag vertical pipe 71 is connected just below each slag outlet 7, the bottom end of the slag vertical pipe 71 is connected to the inner end of the slag horizontal pipe 72, and the outer end of the slag horizontal pipe 72 extends toward the direction close to the cover side 251.

[0058] Preferably, all the slag outlets 7 are arranged along the same diameter on the top surface 252 of the cover, and an inspection port 73 is opened in the middle of the diameter. The outer ends of all the slag outlet transverse pipes 72 on the same side of the inspection port 73 are in the same direction, and the outer ends of the slag outlet transverse pipes 72 on the left side of the inspection port 73 are in the opposite direction to the outer ends of the slag outlet transverse pipes 72 on the right side of the inspection port 73; a slag pushing slide rail 81 is suspended above all the slag outlets 7 on the left or right side, and a slag pushing car 8 is provided on the slag pushing slide rail 81 for reciprocating sliding with it, and slag pushing baffles 82 are respectively provided on both sides of the slag pushing slide rail 81. The slag pushing cavity 83 formed by the slag pushing baffles 82 is communicated with the inner end of the slag pressing cavity 84 provided on the top fixing ring 241, and the slag pressing cavity 84 is formed by clamping two slag pressing baffles 85. A slag pressing device 86 is provided in the slag pressing cavity 84, and the outer end of the slag pressing cavity 84 is connected to the conveyor belt 87.

[0059] It is further preferred that the bottom of the inspection port 73 is connected to the top of the inspection pipe 9, and the bottom of the inspection pipe 9 is connected to the rotating side 921 of the air blocking plate 92 through the hinge 91. The area of the air blocking plate 92 is greater than or equal to the area of the bottom of the inspection pipe 9. The part of the air blocking plate 92 away from the rotating side is connected to the bottom end of the door chain 922, and the top end of the door chain 922 passes through the inspection pipe 9 and the inspection port 73 in sequence and then extends upward.

[0060] Example 6: The basic content is the same as Example 5, except that: A left slag inspection port 93 and a right slag inspection port 94 are respectively provided on the side wall of the inspection pipe 9 at the left and right sides of the loose-leaf 91. The left slag inspection port 93 is communicated with the inner end of the left slag inspection pipe 931, and the outer end of the left slag inspection pipe 931 extends away from the left slag inspection port 93. The right slag inspection port 94 is communicated with the inner end of the right slag inspection pipe 941, and the outer end of the right slag inspection pipe 941 extends away from the right slag inspection port 94. The slag inlet 932 on the outer end of the left slag inspection pipe 931 is opposite to the slag inlet 932 on the outer end of the right slag inspection pipe 941.

[0061] Example 7: The basic content is the same as Example 5, except that: The side edges of the bottom opening of the inspection pipe 9 located on both sides of the loose-leaf 91 are the bottom left side 911 and the bottom right side 912. The front and rear ends of the bottom left side 911 and the bottom right side 912 are each connected to the top of an angle steel 951. The bottom end of the angle steel 951 is connected to the top surface of the stirring horizontal plate 95 below the air blocking plate 92, wherein the number of stirring horizontal plates 95 is at least one. When the number of stirring horizontal plates 95 is greater than or equal to two, all stirring horizontal plates 95 are arranged in sequence along the longitudinal direction, and the connection structure between adjacent stirring horizontal plates 95 is similar to the connection structure between the top stirring horizontal plate 95 and the air blocking plate 92.

[0062] Example 8: The basic content is the same as Example 5, except that: A drive rack 253 is provided around the outer wall of the cover side 251, and a drive gear 244 is provided on the side ring 242, which meshes with the drive rack 253. When in use, the drive gear 244 is driven to rotate, thereby driving the drive rack 253 to rotate, thereby driving the floating cover 25 to rotate. When there is only one set of drive rack 253 and drive gear 244, the direction of the drive gear 244 is switched to achieve the switching of the floating cover 25 between clockwise and counterclockwise directions. When there are two sets of drive rack 253 and drive gear 244, the two drive racks 253 are separately provided on the cover side 251, one set is responsible for clockwise rotation, and the other set is responsible for counterclockwise rotation. The switching operation enables the floating cover 25 to switch between clockwise and counterclockwise directions. In addition, when the floating cover 25 switches to rotate in the opposite direction, it only has a single stirring function and does not have a slag discharge function.

[0063] Example 9: The basic content is the same as Example 1, except that: The part of the side wall of the tank body 22 near its top is connected to the inner end of the horizontal connecting pipe 221, the outer end of the horizontal connecting pipe 221 is connected to the bottom end of the vertical connecting pipe 222, and the top end of the vertical connecting pipe 222 extends upward until it is connected to the bottom of the constant pressure water tank 223. The water level controller 224 and the top end of the overflow pipe 225 are provided in the part near the liquid surface of the constant pressure water tank 223. The bottom end of the overflow pipe 225 passes through the bottom of the constant pressure water tank 223 and extends downward until it is connected to the biogas pool 62.

[0064] Example 10: The basic content is the same as Example 5, except that: See also Figure 13 — Figure 15 The bottom of the side connecting ring 242 is connected to the outer edge of the bottom supporting ring 243, and the inner edge of the bottom supporting ring 243 is connected to the bottom of the inner vertical ring 245. The top of the inner vertical ring 245 extends upward and is set lower than the cover top surface 252. The side connecting ring 242, bottom supporting ring 243, and inner vertical ring 245 together form a fixed ring groove 246. During use, water is injected into the fixed ring groove 246, and the bottom of the cover side 251 is immersed in the water. The water creates a water seal for the gas, preventing biogas leakage.

[0065] Example 11: The basic content is the same as Example 5, except that: See also Figure 13 — Figure 15 The slag discharge vertical pipe 71 includes an outer pipe wall 711, an inner pipe wall 712 and a bottom pipe ring 713. The outer pipe wall 711 is coaxially arranged with the inner pipe wall 712 located inside it. The bottom of the outer pipe wall 711 is connected to the bottom of the inner pipe wall 712 through the bottom pipe ring 713. The middle part of the inner pipe wall 712 is connected to the interior of the slag discharge horizontal pipe 72 through the middle part of the bottom pipe ring 713. An inner tube cavity 714 is formed between the outer pipe wall 711 and the inner pipe wall 712. An air sealing hood 715 with an opening at the bottom is inserted into the inner pipe wall 712. The top of the air sealing hood 715 is placed on the top of the inner pipe wall 712, and the side of the air sealing hood 715 is inserted down along the inner tube cavity 714. During operation, water is injected into the inner tube cavity 714 to create a water-sealed effect on the gas, thereby enabling safe operation even when the fermentation raw materials in the fermentation tank 2 are not full, thereby preventing biogas leakage. For example, before normal operation, various debugging can be carried out by simply placing some fermentation raw materials in the fermentation tank 2, which greatly saves debugging time, at least saving more than two months. It can also prevent biogas leakage after normal operation when there is less fermentation raw materials remaining in the fermentation tank 2. In addition, it does not hinder slag discharge, and only needs to remove the gas sealing cover 715.

[0066] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A dry, ultra-energy-saving, industrially applicable, efficient, and safe biogas production system, characterized by: The biogas system comprises a fermentation tank (2), a feed trough (3), a feed rope (1) and a stirrer (4); the fermentation tank (2) comprises a tank body (22) and a tank top (21) and a tank bottom (23) connected thereto from top to bottom; the tank bottom (23) is a truncated cone structure that is wide at the top and narrow at the bottom; the bottom surface of the tank bottom (23) is connected to the bottom end of a central column (41); the top end of the central column (41) extends upward to the interior of the tank body (22); and a stirrer (4) is sleeved on the middle of the central column (41) and is rotatably engaged therewith; A vertical feed trough (3) is provided on each of the left and right sides of the tank body (22), a driving pulley (31) is provided above the feed trough (3), the top of the feed trough (3) is provided higher than the tank top (21), a feed port (32) is provided on the side wall of the feed trough (3) near the top thereof, the bottom end of the feed trough (3) is connected to one end of a curved pipe (33), the other end of the curved pipe (33) penetrates the tank body (22) and communicates with the interior of the tank body (22), and a steering pulley (34) is provided inside the curved pipe (33); The feed rope (1) is sequentially wound around the driving pulley (31) above the left feed trough (3), the steering pulley (34) in the left curved pipe (33), the stirring plate (4), the steering pulley (34) in the right curved pipe (33), and the driving pulley (31) above the right feed trough (3) to form a closed loop. A pressing plate (36) is respectively provided on the feed rope (1) near the left and right feed ports (32). The pressing plate (36) is located in the corresponding feed trough (3), and the middle part of the feed rope (1) is wound around the side of the stirring plate (4).

2. The dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 1 is characterized by: The top end of the left feed trough (3) is connected to the top end of the right feed trough (3) via two I-beams (311), and a pulley base (312) is fixed to each end of the I-beam (311) to support the corresponding driving pulley (31), and a driving motor (313) is provided beside the right driving pulley (31) to rotate with the driving pulley (31).

3. A dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 1 or 2, characterized in that: A cable drum (351) is provided on the feed trough (3) at a position higher than the feed port (32). The outer end of the cable wound on the cable drum (351) is connected to the feeding vehicle (35). The feeding vehicle (35) reciprocates up and down along the inclined slide (352). The top end of the inclined slide (352) is communicated with the feed port (32), and the bottom end of the inclined slide (352) extends downwardly at an angle.

4. A dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 1 or 2, characterized in that: The bottom surface of the tank bottom (23) is connected to the bottom of the sand receiving pool (5) at a position close to the central column (41), the top of the sand receiving pool (5) is connected to the bottom end of the sand receiving tray (51), and the top end of the sand receiving tray (51) extends obliquely upward until it is connected to the other end of the curved pipe (33); The side of the sand receiving pool (5) is connected to one end of the sand discharge pipe (52), and the other end of the sand discharge pipe (52) passes through the tank body (22) and is connected to the sand storage pool (53) located outside the fermentation tank (2). A sand control valve (54) is provided on the sand discharge pipe (52) at a portion located outside the fermentation tank (2).

5. The dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 4 is characterized by: The width of the sand receiving tray (51) gradually increases from low to high.

6. A dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 1 or 2, characterized in that: The bottom of the tank bottom (23) is connected to one end of the biogas liquid pipe (6), and the other end of the biogas liquid pipe (6) passes through the tank bottom (23) and is connected to the bacterial liquid pump (61), the biogas liquid tank (62), and the concentrated liquid tank (63) located outside the fermentation tank (2), and a liquid control valve (64) is provided on each pipeline to the bacterial liquid pump (61), the biogas liquid tank (62), and the concentrated liquid tank (63); The output end of the bacterial supplementation liquid pump (61) is connected to one end of the bacterial supplementation liquid pipe (65), and the other end of the bacterial supplementation liquid pipe (65) is connected to the nozzle (66), and the liquid outlet of the nozzle (66) is arranged higher than the feed port (32).

7. A dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 1 or 2, characterized in that: The top of the central column (41) is inserted and connected with the middle of the top bearing (42), the middle of the central column (41) is inserted and connected with the middle of the middle bearing (43), the bottom of the top bearing (42) is connected to the top of the middle bearing (43) via a rotating cylinder (44), the rotating cylinder (44) is sleeved on the outside of the central column (41), and the middle of the stirring disk (4) is sleeved on the side of the rotating cylinder (44); The bottom of the stirring disc (4) is connected to a portion of the rotating drum (44) near the middle bearing (43) via at least two oblique support ribs (45); a stirring chain (46) extending downward is connected to both the stirring disc (4) and the oblique support ribs (45); and a plurality of upper stirring plates (47) extending upward are connected to the top of the stirring disc (4).

8. A dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 1 or 2, characterized in that: The tank top (21) includes a fixed cover (24) and a floating cover (25) located inside the fixed cover (24), wherein the fixed cover (24) includes a top fixing ring (241), a side connecting ring (242) and a bottom supporting ring (243), and the floating cover (25) includes a cover side perimeter (251) and a cover top surface (252) connected to the top of the floating cover. The outer side of the top fixing ring (241) is connected to the top of the can body (22), the inner side of the top fixing ring (241) is connected to the top of the side connecting ring (242), the bottom of the side connecting ring (242) is connected to the outer side of the bottom supporting ring (243), and the cover side circumference (251) is located directly above the top surface of the bottom supporting ring (243), and the bottom area of the cover side circumference (251) is larger than the area of the inner ring surface of the bottom supporting ring (243); A plurality of slag discharge ports (7) are provided on the top surface (252) of the cover. The top end of a slag discharge vertical pipe (71) is connected to the bottom of each slag discharge vertical pipe (71). The bottom end of the slag discharge vertical pipe (71) is connected to the inner end of the slag discharge horizontal pipe (72). The outer end of the slag discharge horizontal pipe (72) extends toward the side wall (251) of the cover.

9. The dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 8, characterized in that: All the slag outlets (7) are arranged on the same diameter of the cover top surface (252), and an inspection port (73) is provided in the middle of the diameter. The outer ends of all the slag outlet transverse pipes (72) on the same side of the inspection port (73) are oriented in the same direction, and the outer ends of the slag outlet transverse pipes (72) on the left side of the inspection port (73) are oriented in the opposite direction to the outer ends of the slag outlet transverse pipes (72) on the right side of the inspection port (73); A slag pushing rail (81) is suspended above all slag outlets (7) on the left or right side. A slag pushing vehicle (8) is provided on the slag pushing rail (81) for reciprocating sliding therewith. Slag pushing baffles (82) are provided on both sides of the slag pushing rail (81). A slag pushing cavity (83) formed by the slag pushing baffles (82) is communicated with the inner end of a slag pressing cavity (84) provided on the top fixing ring (241). The slag pressing cavity (84) is formed by two slag pressing baffles (85). A slag pressing device (86) is provided in the slag pressing cavity (84). The outer end of the slag pressing cavity (84) is communicated with a conveyor belt (87).

10. The dry-type ultra-energy-saving biogas system capable of industrialized, efficient and safe production according to claim 8, characterized in that: The bottom of the inspection port (73) is connected to the top of the inspection pipe (9), and the bottom of the inspection pipe (9) is connected to the rotating side (921) of the air blocking plate (92) through the hinge (91). The area of the air blocking plate (92) is greater than or equal to the area of the bottom of the inspection pipe (9). The portion of the air blocking plate (92) away from the rotating side is connected to the bottom end of the door chain (922), and the top end of the door chain (922) passes through the inspection pipe (9) and the inspection port (73) in sequence and then extends upward.

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