CN206408220U - One kind grows small shallow pair of bar arcuately domestic methane tank - Google Patents

Abstract

Small shallow pair of bar arcuately domestic methane tank is grown the utility model discloses one kind, including fermentation vat, the fermentation vat is made up of bottom of pond and the Chi Gai being arranged in bottom of pond, the bottom of pond is concrete, Chi Gai is glass steel or stainless steel, bottom of pond is the overall arc-shaped grooves in strip, Chi Gai is in integrally the arch of strip, bottom of pond and the arcwall face transition of Chi Gai two ends, fermentation vat, which is covered, is provided with charging aperture, airway tube, discharge nozzle, go out dense fertilizer pipe and the pipe that reloads greatly, charging aperture is arranged on Chi Gai one end, discharge nozzle is arranged on the Chi Gai other end, the pond side of covering of discharging pipe end sets water pressure chamber, airway tube is arranged on Chi Gai top, bottom of pond bottom is stretched into the side for going out dense fertilizer pipe and the Guan Congchi lids that reload greatly, the reload greatly position of pipe of bottom of pond correspondence is provided with and recessed strains puddle.It is mainly used in methane-generating pit for farm household.

Description

A long and small shallow double arch household biogas digester

technical field

The utility model belongs to the field of biogas pits, in particular to a long, small and shallow double arch type household biogas pit.

Background technique

The currently promoted cylindrical biogas digester fermentation raw materials are pushed from the inlet to the outlet, and only pass through the middle of the fermentation room. The materials on the top, bottom, left, and right sides of the fermentation room do not flow, resulting in less material flow volume and more blind volume. Taking the national standard 8m ³ cylindrical biogas digester as an example, the actual volume of the main tank is 8.34m ³ . When there is no mixing facility, the material flow cross section is approximately circular, and the flow diameter is about 1m most of the time. When the diameter of the biogas digester is 2.7m, the volume of side fermentation raw materials that can be in contact with bacteria (called effective fermentation volume) is 2.12m ³ , accounting for only 25.4% of the volume of the main tank, that is, the invalid fermentation volume (also called blind volume) accounts for 75%. about. If there is no slag in two or three years or there are few pigs or the opening of the pool wall is narrow, the volume of the fermentation blind zone will reach about 90%. It can be seen that the short circuit of the material movement in the cylindrical biogas digester is particularly serious, and there are many dead spots in the fermentation.

Four major factors lead to the low volumetric gas production rate of cylindrical biogas digesters: 1) Serious short circuit of material movement and many fermentation blind spots, resulting in long retention period of fermentation raw materials in name and short actual effective retention period, resulting in low degradation rate of raw materials and low volume load And the volumetric gas production rate is low. Increase the volume load, and it is easy to produce acidification of fermentation raw materials and the biogas produced during the second peak period of fermentation overflows to the discharge port, making it difficult to increase the volume load and volume gas production rate; 2) Reserve 10% of the gas box volume for the biogas digester , which directly reduces the volumetric gas production rate by 10%. 3) The scum is almost not in contact with the biogas slurry, resulting in insufficient moisture in the scum and too few bacterial species, resulting in almost no degradation of the scum, and a low volumetric gas production rate; 4 ) The biogas residue cannot be removed at any time. As the operation time increases, the biogas residue gradually occupies the volume of the fermentation room, which leads to low degradation rate of fermentation raw materials and low volumetric gas production rate. The problems in the above four aspects lead to a volumetric gas production rate of about 0.1m ³ /m ³ .d in the normal temperature fermentation cylindrical household biogas digester without stirring, and it is not easy to increase.

Because the cylindrical biogas digester is deep, the highest water level of the fermented liquid is lower than the floor level, and it is a small discharge pipe, so farmers can only scoop up the biogas liquid with a long lever with a long scoop of manure, which is very laborious and difficult. Only biogas slurry with low nutrients can be scooped out, but biogas residue with more than ten times the nutrient content of biogas slurry cannot be scooped up. In this way, using biogas slurry requires a lot of labor, high labor intensity, and low nutrients. In the era of market economy with high labor value and sufficient supply of chemical fertilizers, it is not as cost-effective as using chemical fertilizers. Therefore, most pond owners are unwilling to use biogas slurry.

The difficulty in removing slag from a cylindrical biogas digester lies in the following four aspects: 1) The bottom of the biogas digester is pot-shaped, and the deepest part is in the center of the main pond. The biogas residue cannot be pushed along with the fermentation raw materials to the direction of the discharge port, and accumulates in the main pond; 2) The biogas digester is relatively deep, and the diameter of the discharge pipe is only 0.3m. The diameter of the pipe is too small. Farmers usually cannot scoop out the biogas residue with a fertilizer content that is about three times that of pig manure. The biogas residue accumulates over time and deposits at the bottom of the pond. The output of biogas residue is large; 3) The biogas digester is deep, and the labor intensity of the biogas residue is high, and only strong labor can adapt; 4) The deepest part of the biogas digester is in the center of the main pond, and it is impossible to decant the residue contained in the biogas residue outside the pond before discharging. Biogas slurry and biogas slag have high water content, resulting in a large volume of biogas slag, which increases the labor and difficulty of slag removal. From the above, it can be known that the biogas residue of the cylindrical biogas tank is accumulated in the main pond, and the deposition amount is large, and it cannot be scooped out at ordinary times. Troublesome, accident-prone work.

It is difficult to close the movable cover. Whether the movable cover can be closed well is related to many factors such as the production of the cover, the quality of the yellow mud, the amount of lime powder, the humidity of the cover, the cleaning and sealing process, etc. It is difficult to master the sealing technique. Technicians who have been trained for many times can only have about 90% success rate of closing the movable cover once. Once an air leak occurs, it is difficult to remedy it successfully and can only be reclosed. During use, the head of the household usually closes the movable cover by himself, and the proportion of the movable cover that can be closed at one time is less than 50%. Some users cannot seal it well after closing it for two or three times. Seal the movable cover with cement mortar.

High management costs. The cylindrical biogas digester is deep, and it is discharged from a small tube, and the deepest part of the biogas digester is in the center of the main pond. As a result, farmers cannot usually scoop up thick manure and biogas residue with high nutritional content, resulting in the rapid accumulation of biogas residue in the pond. Fast, the rapid shortening of the effective residence period of fermentation raw materials and the need to clean up the disadvantages of biogas residues every year. It costs 200 to 300 yuan to clean the biogas residue of an 8m ³ biogas digester by mechanical pumping, and the manual cleaning is even higher. After removing the biogas residue, it takes half a working day for a highly skilled technician to close the movable cover, and the labor cost is 80 yuan About 0.25 working days per household per year for daily maintenance work such as gas appliances and gas transmission lines, and the labor cost is about 30 yuan. In summary, the annual management fee for an 8m ³ biogas digester is mechanically pumped out It needs 310 to 410 yuan. It can be seen that the management cost is high, and more than 90% of it is the management of the biogas digester. As a result, it is difficult for service personnel to survive without government subsidies. Without service personnel, it is difficult for most users to manage their biogas digesters well, and the deactivation and scrapping of biogas digesters follow.

The deepest bottom of the cylindrical biogas digester is in the middle of the main pond. At the bottom of this kind of pond, the flowing biogas slurry cannot be decanted during large refueling, and the toxic and harmful gases H ₂ S and CO ₂ dissolved in the biogas slurry are stored. In the biogas slurry, when the biogas residue is produced, H ₂ S and CO ₂ will be released rapidly due to stirring and heating, forming a suffocating and toxic environment, which is likely to cause safety accidents.

Utility model content

The purpose of the utility model is to provide a long, small and shallow double-arched household biogas digester, which solves the problems of low volumetric gas production rate, high construction cost and high management cost of the existing biogas digesters.

The technical scheme of the utility model is: a long and small shallow double-arched household biogas digester, including a fermentation tank, the fermentation tank is composed of a pool bottom and a pool cover arranged on the bottom of the pool, and the bottom of the pool is concrete , the pool cover is made of glass fiber reinforced plastic or stainless steel. The length of the tank is 2.5m-4.5m, the width at the widest point is 1.2m-1.7m, the maximum height of the fermentation tank is 0.9m-1.3m, the depth from the bottom of the tank to the ground is 1m-1.4m, and the tank cover is equipped with The feed inlet, air guide pipe, discharge pipe, concentrated fertilizer discharge pipe and large refill pipe, the feed inlet is set at one end of the pool cover, the discharge pipe is set at the other end of the pool cover, and the discharge pipe end is set above the pool cover In the water pressure room, the air guide pipe is set on the top of the tank cover, the thick fertilizer outlet pipe and the large refueling pipe extend from the side of the tank cover to the bottom of the pool bottom, and the bottom of the pool corresponding to the position of the large refueling pipe is provided with a concave first decanter puddle.

Further, the feed port is composed of a feed room arranged above the pool cover and a feed pipe connected to the bottom of the feed room and extending into the pool cover.

Further, a water distribution plate is arranged on the bottom of the pool next to the lower opening of the feed pipe.

Further, the cross-section of the water distribution plate is arc-shaped, and there is a trapezoidal notch at the lower part of the middle part of the water distribution plate.

Further, a biogas slurry self-flow pipe is arranged on the side wall of the water pressure room.

Further, an overflow port is opened in the water pressure room.

Further, the diameter of the lower part of the airway is larger than that of the upper part, the upper part is a small tube with a diameter of 10mm-12mm, and the lower part is a large tube with a diameter of 120mm-160mm. This is less prone to clogging and easier to maintain.

Further, the bottom of the pool at one end of the discharge pipe is lower than the bottom of the pool at the end of the feed port, and a second decanting pit is arranged at the lowest point of the bottom of the pool. The second decanter helps to remove all the biogas slurry during major refueling.

Further, the discharge pipe has a diameter of 0.4m-0.7m and a length of 0.35m-0.65m. It is both a discharge pipe and a manhole.

Compared with the prior art, the utility model has the following advantages:

1. High volumetric gas production rate: the fermentation tank is composed of the bottom of the tank and the tank cover set on the bottom of the tank. The bottom of the tank and the two ends of the tank cover have arc-shaped transitions. The length of the longest part of the fermentation tank is 2.5m-4.5m, and the width of the widest part is 1.2m-1.7m. The maximum height of the inner space of the fermentation tank is 0.9m-1.3m. The depth from the bottom to the ground is 1m-1.4m. For this kind of fermentation tank with long, small and shallow structure, by increasing the length, reducing the width, reducing the depth, removing the reserved air box, and increasing the water distribution board, several measures work together to eliminate the roundness. The cylindrical biogas digester occupies more than 50% of the volume of the main tank, which has nothing to do with fermentation, and there are very few blind spots in the fermentation process. Under the pushing flow of new fermentation raw materials, the fermentation liquid can basically flow from the feed pipe end to the discharge pipe end relatively uniformly. , About 85% of the fermentation room is the effective fermentation volume, which not only greatly improves the degradation rate of raw materials, but also increases the volume load and increases the volumetric gas production rate. The scum has been soaked in the biogas slurry for a long time, and the scum has sufficient water and There are more bacterial species, the scum degradation rate is high, and the volume gas production rate is improved. The volume gas production rate of the biogas digester with the structure of the utility model can be increased from about 0.1m ³ /m ³ .d of the cylindrical pool to 0.3 m ³ /m ³ .d or so.

^{2. Low cost of building ponds: Compared with the 4m 3 , 6m 3 , 8m 3 and 10m 3 cylindrical biogas} digesters ^of the utility model structure, the volume Reduced by 50%, the surface area reduced by about 30%, and the biogas tank wall and movable cover were removed and the commercial pool cover was used, which simplified the construction and sealing process, shortened the construction period by about 65%, reduced labor by about 55%, and reduced the construction of pools About 40% of the cost. The volume of the long, small and shallow double arched household biogas pools of the utility model is 2m ³ -5m ³ , among which, 2m ³ and 3m ³ are sanitary pools, and 4m ³ and 5m ³ are energy pools.

3. Low management cost: Compared with the cylindrical biogas digester, since the zero pressure line of the fermentation tank is higher than that of the fermentation tank, the degradation rate of scum is high, and the residual quantity is reduced. Fertilizer and sediment, thick fertilizer and sediment are often produced, and the residual amount of sediment is greatly reduced. Both of them greatly reduce the amount of biogas residue (scum and sediment), and the time for refueling of the biogas tank can be extended from about one year to three to five years or more. For a longer time, the labor required for discharging biogas residues is greatly reduced. Since there is a decanting pit on the bottom of the tank corresponding to the large refueling pipe, the residual biogas slurry in the biogas residues can be decanted during the large refueling, which reduces labor intensity and dirt. The density, odor and bulk density of biogas residues are greatly reduced, thereby improving the efficiency of slag discharge and reducing the labor required for slag discharge. The biogas slurry of the biogas pool of the utility model flows out automatically, which saves the labor of scooping manure, and after removing the movable cover, the problem of closing the movable cover and the labor of sealing are eliminated. Several major measures work together to simplify management. , and can reduce management costs by about 75%, and can transform the commonly known "three-point building pool and seven-point management" into "seven points and three-point management".

4. Reduction of safety accidents: The biogas digester of the utility model is equipped with a decanting pit, which can decant the biogas slurry during large-scale refueling, so that the toxic and harmful gases H ₂ S and CO ₂ dissolved in the biogas slurry can be removed, and the slag is discharged Safety accidents can be greatly reduced, and the interval between major refueling is long, which indirectly reduces safety accidents. The depth from covering soil to the bottom of the pool is only about 1.25m, which can reduce the safety accidents of pool construction and large refueling.

5. Conducive to the commercialization of biogas digesters: the length of the biogas digesters of the utility model can be completely designed according to the flow length required by the fermentation process, and the span length can be determined according to the requirements of the fermentation process, the width of the car compartment and the height of the entrance door. Small, easy to solve the problem of force, because of the small total surface area, easy to solve the problem of cost, which is very conducive to the development of biogas digesters with FRP or stainless steel covers, and can promote the commercialization of biogas digesters.

In summary, compared with the cylindrical biogas digester, the biogas digester of the present utility model can greatly increase the volumetric gas production rate, greatly reduce the cost of building the pond, management cost and safety accidents, and can also automatically produce biogas slurry and biogas residue , and can promote the commercialization of biogas digesters, so as to achieve the goal of increasing total output, reducing total input, reducing the cost of biogas production, improving the direct economic benefits of farmers building biogas digesters, and promoting the gradual marketization of biogas construction.

Description of drawings

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

Fig. 2 is the structural representation of the top view of the utility model;

Fig. 3 is the structural representation of the left view of the utility model,

Figure 4 is a schematic structural view of the water distribution plate.

The reference signs in the figure are: 1-fermentation tank, 2-feed room, 3-feed pipe, 4-outlet pipe, 5-air guide pipe, 6-fertilizer storage tank, 7-biogas slurry artesian pipe, 8- Concentrated fertilizer pipe, 9-big refueling pipe, 10-steel wire hose, 11-stool pit, 12-overflow port, 13-first decanting pit, 14-water distribution board, 15-hydraulic room, 16-trapezoidal gap, 17-the second decanting pit.

detailed description

Example 1

A long and small shallow double-arched household biogas digester, including a fermentation tank 1, the fermentation tank is composed of a pool bottom and a pool cover arranged on the pool bottom, the pool bottom is made of concrete, and the pool cover is made of glass fiber reinforced plastic or stainless steel , the bottom of the pool is a long arc groove as a whole, the pool cover is a long arc shape as a whole, the bottom of the pool and the arc surface at both ends of the pool cover transition, that is, the mouth of the pool bottom and the pool cover are both The middle part is rectangular, the two ends are arc-shaped, the bottom of the pool and the top of the pool cover are arc-shaped surfaces, and the bottom of the pool and the mouth of the pool cover are closed to form a fermentation tank 1. The length of the longest part of the fermentation tank 1 is 2.5m-4.5m, the width of the widest part is 1.2m-1.7m, the maximum height of the inner space of the fermentation tank 1 is 0.9m-1.3m, and the depth from the bottom of the tank to the ground is 1m-1.4m m, when the volume of the fermentation tank 1 is between 2 cubic meters and 5 cubic meters, the process of fermentation raw materials is long, the fermentation blind spots are very few, and the gas production can meet the needs of farmers. The tank cover is provided with a feed inlet, an air guide pipe 5, a discharge pipe 4, a concentrated fertilizer discharge pipe 8 and a large refueling pipe 9, the feed inlet is set at one end of the pool cover, and the discharge pipe 4 is set at the other end At one end, a water pressure room 15 is set above the pool cover at the 4 end of the discharge pipe, and the air guide pipe 5 is set on the top of the pool cover. The position of the large refueling pipe 9 is provided with a sunken first decanting pit 13 .

A cesspool pit 11 is arranged next to the fermentation tank 1, and a steel wire hose 10 is connected to the end of the concentrated fertilizer pipe 8, and the steel wire hose 10 is connected in the cesspool pit 11. The end of the large refueling pipe is connected with a longer steel wire hose 10, both can utilize biogas pressure and siphon to refuel, and the biogas residue extruded is stored in the fertilizer storage tank 6 for stand-by.

Example 2

This embodiment is a further optimization on the basis of Embodiment 1. The feed port is composed of a feed room 2 arranged above the tank cover and a feed pipe 3 connected to the bottom of the feed room 2 and extending into the tank cover. When feeding, the fermentation raw material is put into the feeding room 2, and the fermentation raw material flows into the fermentation tank 1 through the feeding pipe 3.

Example 3

This embodiment is further optimized on the basis of embodiment 1, and a water distribution plate 14 is arranged on the bottom of the pool next to the lower opening of the feed pipe 3 . The water distribution plate 14 is installed so that the fermented raw materials put in can flow from both sides of the water distribution plate 14 to the direction of the discharge pipe 4, thereby promoting the fermentation raw materials and sediment on both sides of the fermentation room 1 to flow more evenly to the discharge pipe 4 directions to avoid fermentation blind spots.

Example 4

This embodiment is a further optimization on the basis of Embodiment 3. In order to distribute water evenly and reduce flow resistance, the cross section of the water distribution plate 14 is arc-shaped, and the lower part of the water distribution plate 14 is opened. There is a trapezoidal gap 16, so that the fermentation raw material is divided into three streams to flow from the two sides and the middle of the water distribution plate 14 to the direction of the discharge pipe 4.

Example 5

This embodiment is further optimized on the basis of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4, and the biogas slurry self-flow pipe 7 is arranged on the side wall of the water pressure room 15 . The biogas slurry can flow out automatically under the liquid level pressure and the biogas pressure like this, and the fertilizer storage pond 6 can be dug under the ground, and the biogas slurry flowing out is packed in the fertilizer storage pond 6 for use.

Example 6

This embodiment is further optimized on the basis of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 or embodiment 5, and overflow port 12 is opened on the described water pressure room 15, when the amount of biogas slurry is too much , it can flow out from the overflow port 12, and the outflowing biogas slurry flows into the fertilizer storage tank 6.

Example 7

This embodiment is further optimized on the basis of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 or embodiment 5 or embodiment 6, and the diameter of the lower part of the airway tube 5 is greater than that of the upper part. The upper part of the airway 5 is a small tube with an inner diameter of 10mm-12mm, and the lower part is a large tube with an inner diameter of 120mm-160mm, which is not easy to be blocked and easy to maintain.

Example 8

This embodiment is further optimized on the basis of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 or embodiment 5 or embodiment 6 or embodiment 7, in order to facilitate the decanting of biogas slurry during large refueling , the bottom of the pool at one end of the discharge pipe 4 is lower than the bottom of the pool at the end of the feed port. In this way, the deepest position of the fermentation tank 1 can be transferred from the center to the position close to the discharge pipe 4, and the second decanting pit 17 can be set at this position. Flowable biogas slurry in dry biogas residue.

Example 9

This embodiment is further optimized on the basis of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 or embodiment 5 or embodiment 6 or embodiment 7, and the discharge pipe diameter is 0.4m-0.7m, The length is 0.35m-0.65m. This kind of discharge pipe has a large diameter and short length, which is both a discharge pipe and a manhole.

The above-mentioned embodiments only express the specific implementation manners of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the protection scope of the present application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the technical solution of the present application, and these all belong to the protection scope of the present application.

Claims (9)

1. A long and small shallow double-arched household biogas digester, including a fermentation tank, is characterized in that the fermentation tank is composed of the bottom of the pool and a pool cover arranged on the bottom of the pool, the bottom of the pool is concrete, and the bottom of the pool is made of concrete. The cover is made of glass fiber reinforced plastic or stainless steel. The bottom of the pool is a long strip-shaped arc groove. The pool cover is a long strip-shaped round arch. 2.5m-4.5m, the width at the widest point is 1.2m-1.7m, the maximum height of the fermentation tank is 0.9m-1.3m, the depth from the bottom of the tank to the ground is 1m-1.4m, and the tank cover is equipped with feed mouth, air guide pipe, discharge pipe, concentrated fertilizer discharge pipe and large refueling pipe, the feed inlet is set at one end of the pool cover, the discharge pipe is set at the other end of the pool cover, and the water pressure is set above the pool cover at the end of the discharge pipe. In between, the air guide pipe is set on the top of the tank cover, the thick fertilizer outlet pipe and the large refueling pipe extend from the side of the pool cover to the bottom of the pool bottom, and the bottom of the pool corresponding to the position of the large refueling pipe is provided with a concave first decanting pit . 2. A long and small shallow double arch household biogas digester according to claim 1, characterized in that the feed inlet is connected to the bottom of the feed room and extends into the feed room provided above the pool cover. The feed tube inside the tank cover constitutes. 3. A long and small shallow double-arched household biogas digester according to claim 2, characterized in that a water distribution board is arranged on the bottom of the pond next to the lower opening of the feed pipe. 4. A long, small and shallow double-arched household biogas digester according to claim 3, characterized in that the cross-section of the water distribution board is arc-shaped, and the lower part of the water distribution board is opened. There are trapezoidal notches. 5. The long and small shallow double-arched household biogas digester according to claim 1, wherein a self-flowing pipe for biogas slurry is arranged on the side wall of the water pressure room. 6. A long, small and shallow double arched household biogas digester according to claim 1, characterized in that an overflow port is opened in the water pressure room. 7. A long, small and shallow double arch household biogas digester according to claim 1, characterized in that the diameter of the lower part of the air duct is larger than that of the upper part, the upper part is a small tube with a diameter of 10mm-12mm, and the lower part is a large tube with a diameter of 120mm-160mm Tube. 8. A long and small shallow double-arched household biogas digester according to any one of claims 1-7, characterized in that the bottom of the pool at one end of the discharge pipe is lower than the bottom of the pool at the end of the feed port, and the bottom of the pool at the end of the pool There is a second decanting pit at the lowest point of the bottom. 9. A long and small shallow double-arched household biogas digester according to any one of claims 1-7, characterized in that the discharge pipe has a diameter of 0.4m-0.7m and a length of 0.35m-0.65m .