CN201250232Y - Biogas pool with circulated material distribution - Google Patents

Abstract

The utility model discloses a circulation cloth biogas pond, aiming at providing a biogas pond with simple structure and good gas production effect. It includes the water inlet movable cover system, the biogas tank main body and the water outlet water pressure room system. The water inlet movable cover system includes the water inlet skylight and the central water inlet pipe. There is no special water inlet for water inlet, but the skylight is used for water inlet. The main body of the digester is a spherical closed tank, including the upper hemisphere of the digester and the cylinder of the digester. The bottom of the biogas digester adopts a convex structure, and a volute-shaped diversion wall is arranged on it, and a shell-breaking tooth is set at every 120mm above the diversion wall 300mm, the purpose is to create a circular distribution function, increase the length of the distribution water flow and automatically Removes crusts. The utility model overcomes the problem that the existing methane pool requires a separate water inlet and that it is difficult to feed materials during gas production.

Description

A circulating cloth biogas digester

technical field

The invention relates to a device for preparing biogas by anaerobic fermentation of organic waste water, in particular to a circulation distribution biogas pond.

Background technique

In rural areas of our country, ecological agriculture centered on household biogas digesters is in the ascendant. On the one hand, biogas digesters can process organic waste to generate bioenergy, and on the other hand, they can ferment manure produced by animal husbandry into organic fertilizers. Pollutants that affect the rural environment are all included in the biogas digester for anaerobic degradation and transformation, which has the effect of beautifying the ecological environment. Therefore, biogas has become a key technology in the construction of new countryside and is bound to play an increasingly important role in the development of rural areas in our country. Combined with the characteristics of farmers in our country, there are three types of household biogas digesters generally used: 6m ³ , 8m ³ and 10m ³ . In 1984, China Standard Publishing House published GB/T4750-1984 "Standard Atlas of Rural Household Hydraulic Biogas Digesters" issued by the National Bureau of Standards, which proposed the structure of rural biogas digesters, which are round or spherical in shape and equipped with feed inlets. , discharge port, fermentation room, air box, movable cover, air duct, discharge room and hydraulic tank, so it is called a hydraulic biogas digester. In 2002, China Standard Press published the GB/T4750-2002 "Standard Atlas of Household Biogas Digesters" issued by the National Bureau of Quality Supervision, Inspection and Quarantine. The discharge port is inclined, and a distributing plate is set on the bottom of the tank to make the fermentation raw materials flow in a curve, increase the diffusion surface, and prolong the operation of the fermentation raw materials. In 2007, Qiu Ling of Northwest Agriculture and Forestry University, published by Science and Technology Literature Publishing House, described the "swirling flow biogas digester" in the book "Efficient Production and Utilization of Garden Biogas", which is characterized in that a curvature radius of 5D/ The arc-shaped deflector of 8 separates the material in and out, so that the raw material entering the pool must swirl along the deflector under the flow guide of the deflector to reach the lower part of the circulation pipe and slag extraction pipe, thus extending the time of entering the pool. The flow path and residence time of fermentation raw materials, and Qiu Ling of Northwest Agriculture and Forestry University also proposed the Chinese patent ZL97243731.2 "Swirling flow cloth automatic circulation biogas digester", which gave a technical description of the swirl flow cloth biogas digester.

At present, these types of biogas digesters are popularized and used in the mainstream of rural areas in China, but they have the following disadvantages in the construction process: 1. It is necessary to set up a feed inlet, a water outlet and a water pressure room, and a movable cover, a total of three openings, three The construction of the opening requires design and construction, and the required cost is about 1/3 of the overall cost. If the number of openings is reduced, it may reduce the cost and save materials; 2. The construction of the movable cover is not good, and air leakage will occur. 3. Due to the small construction area and small slope of the feed inlet, it is easy to cause the feed to float, the feed is difficult to enter the pool, and the feed is blocked; 4. Due to the feed The mouth acts as a water pressure space, which will fluctuate with the air pressure in the biogas tank, which is inconvenient for feeding materials. If the gas pressure in the biogas tank is too high, it will cause inability to feed materials; 5. Since the lower hemisphere of the biogas tank is a concave structure, the biogas residue Not easy to discharge.

Contents of the invention

The purpose of the utility model is to provide a circulating material biogas digester with simple use and construction, spherical shape and high biogas fermentation efficiency.

The purpose of the utility model is achieved by providing a biogas tank with the following structure.

The circulation distribution biogas pool of the utility model includes the following components:

It consists of water inlet movable cover system, biogas tank main body and water outlet system.

The water inlet movable cover system includes a water inlet (skylight) and a central water inlet pipe; the water inlet is the inlet of treated water, which plays the role of collecting and consolidating treated water. The skylight enters the water, and the central water inlet pipe is used after water intake; the water inlet pipe is the cement pipe connected to the skylight, and is the pipe for the treated water to enter the biogas digester. The central water inlet pipe directly enters the bottom center of the biogas digester. The inner diameter of the water inlet pipe is 300mm, and the bottom end is open 200×200mm, such an opening is connected with the volute-shaped fabric wall and forms a circulating fabric.

The main body of the biogas digester is a spherical closed tank, which is divided into two parts, one is the upper hemisphere of the biogas digester, and the other is the cylinder of the biogas digester. These two parts are consistent with the structure of the traditional hydraulic biogas tank, but the utility model is characterized in that the bottom of the biogas tank does not adopt a concave hemispherical shape, but a slightly convex structure. A volute-shaped diversion wall is arranged on the convex structure, the purpose of which is to create a circular distribution function and increase the length of the distribution flow. The distance between the diversion walls is not fixed, it is a typical volute structure, and it needs to be arranged according to Figure 4. The diversion wall is set so that the raw material passing through the water inlet pipe rotates and flows for a circle along the diversion wall in the biogas tank, and then flows freely forward or backward for half a circle from the outlet of the diversion wall along the inner wall of the biogas tank to the biogas. The outlet of the pool. The volute-shaped diversion wall can be set clockwise or counterclockwise, and the utility model recommends clockwise setting. Assuming that the biogas digester is divided into four mathematical quadrants by dots, there are two volute-shaped diversion walls in the third and fourth quadrants in the lower half of the graph, and the first and second quadrants in the upper half of the graph. There is only one diversion wall in , and this single diversion wall starts at 2/5 radius and ends at 3/5 radius. The quadrant where two diversion walls appear starts from the opening of the water inlet pipe, passes through 1/5 of the radius, and connects to a single diversion wall at 2/5 of the radius. The last diversion wall is at a radius of 4 It ends at /5 and meets a single diversion wall at 3/5 of the radius. The diversion wall is a volute structure, thus ensuring the circulation of the cloth. The water inlet opening of the water inlet pipe is positioned opposite to the water outlet, and the volute-shaped diversion wall ends at the farthest end relative to the water outlet. The height of the diversion wall should be higher than the body of the biogas digester, but not more than 1/3 of the arch height of the biogas chamber.

Set up a steady flow wall 0.5 meters in front of the biogas digester outlet to ensure longer and effective anaerobic sludge can stay in the biogas digester. The upper cover of the biogas digester is a traditional water-pressure biogas digester skylight which doubles as a feed inlet, and its sealing method is the same as that of a traditional biogas digester. Next to the skylight at a certain distance from the feed pipe, a metal biogas pipe is inserted, which constitutes the starting connection for the biogas. The bottom plate of the biogas digester is generally a convex structure, which is a two-layer concrete structure, and the slope to the water outlet is 5% to ensure that the sludge flows to the outlet.

The water outlet system includes: a water outlet, a water outlet room and a water pressure room; the water outlet is a rectangular water outlet set at the end of the circular biogas digester, which is the outlet of the treated water. The width is 1 meter, and the height depends on the design pressure of the biogas digester. Generally speaking, the top of the water outlet is at least 1 meter away from the top of the biogas digester, which ensures the stability of the biogas pressure. The water outlet room is built outside the water outlet, a cylindrical or cuboid pipe with a length and width of 1 meter, and the height is higher than the water outlet; the water pressure room is used for the adjustment of the gas production pressure outside the water outlet room. The size is 1/3 of the gas chamber of the advective distribution biogas digester, which is generally set as a circle or a rectangle, the diameter is about the size of the radius of the biogas digester, and the depth is about 1 meter.

The utility model has the advantages of:

1. The structure is simple, which can reduce the construction cost; 2. The feed port of the traditional biogas digester is canceled, and the skylight is used as the feed port, which reduces air leakage; 3. Since the feed port is canceled, the problem of high air pressure at the feed port 4. The hemispherical structure of the lower half of the cylinder of the traditional biogas digester is canceled and a convex structure is adopted, thus solving the problem of feed water pressure obstruction; Biogas residue retention problem.

Description of drawings

Fig. 1 is the overall structural diagram (seeing Fig. 1) that the utility model biogas digester implements;

Fig. 2 is the top view (Fig. 2) of the utility model biogas digester;

Fig. 3 is a side view (Fig. 3) of the utility model biogas digester;

Fig. 4 is the volute shape diversion wall structure sectional view (Fig. 4) of the biogas digester of the present utility model;

Fig. 5 is a water inlet skylight structure and internal structure layout (Fig. 5).

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

The utility model belongs to an energy ecological biogas utilization mode, and the treated biogas slurry and biogas residue can be used for fertilizer or fish farming. The construction material adopts different concrete structures according to the size of the digester.

The utility model biogas tank volume calculation method, the overall shape is a cylindrical cut ball type, assuming that the volume of the biogas tank is V (cubic meters), ρ is the radius of curvature (meters), f is the height of the vector (meters), and H is the height of the pool wall (meters). , D is the inner diameter of the pool (meters), and R is the inner radius of the pool (meters).

Then, the cylinder of the main tank of the biogas digester V1=πR ² H,

The radius of curvature of the pool cover is ρ=(4f ² +D ² )/8f, then the ball-cutting pool cover V2=πf ² (3ρ-f)/3 The convex volume of the bottom of the pool is ignored, then the total volume of the biogas tank is V =V1+V2

Table 1 Geometric Dimensions of Circulation Distribution Biogas Digester (m)

The biogas pool of the utility model is mainly a household type, and the volume is not easy to be too large. The application object is for the use of biogas produced by the organic sewage discharge treatment of farmers, small farms, and small food processing plants.

The water inlet and the movable cover skylight are shared. The utility model does not have a separate water inlet. The water inlet skylight is a circle with an inner diameter of 1 meter or a rectangle with a side length of 1 meter. Its design and construction method are different from traditional water pressure. Type biogas digester consistent (Figure 5). A central water inlet pipe is set in the center of the skylight. The central water inlet pipe is a cement pipe with an inner diameter of 300mm. The bottom side opening of the cement pipe is 200×200mm in size. The opening is facing the water outlet of the biogas digester. The central cement pipe is placed in the biogas digester In the center, an integrated skylight/water inlet device is formed. It can be seen that the utility model cancels the water inlet and the water inlet pipe of the traditional biogas digester, adopts the skylight for water inlet, and uses the central water inlet pipe after the water inlet. The water inlet pipe is the cement pipe connected to the skylight. It is the pipe through which the treated water enters the biogas digester. The central water inlet pipe directly enters the bottom center of the biogas digester. The inner diameter of the water inlet pipe is 300mm, and the bottom opening is 200×200mm. The fabric walls join and create a circulating fabric.

Regarding the location of the biogas metal pipe, a biogas pipe is installed on the upper cover of the biogas tank, which is a metal biogas pipe inserted in the skylight or the upper part of the biogas chamber. This metal pipe constitutes the starting joint of the biogas.

The circulation distribution wall is a diversion wall built on the convex body of the main biogas digester, as shown in Figure 4. The diversion wall arranged on the convex structure is a volute structure, and its purpose is to create a circular distribution function and increase the length of the distribution flow. The distance between the diversion walls is not fixed. It starts from the opening of the water inlet pipe and rotates clockwise or counterclockwise. The central part expands toward the periphery of the digester, and gradually increases the radius of curvature. The diversion wall is set so that the raw material passing through the water inlet pipe rotates and flows for a circle along the diversion wall in the biogas tank, and then flows freely forward or backward for half a circle from the outlet of the diversion wall along the inner wall of the biogas tank to the biogas. The outlet of the pool. The volute-shaped diversion wall can be set clockwise or counterclockwise, and the utility model recommends clockwise setting. Assuming that the biogas digester is divided into four mathematical quadrants by dots, as shown in Figure 4, there are two volute-shaped diversion walls in the lower half of the graph, namely the third and fourth quadrants, and in the upper half of the graph That is, there is only one diversion wall in the first and second quadrants, and this single diversion wall starts from the 2/5 radius and ends at the 3/5 radius. The quadrant where two diversion walls appear starts from the opening of the water inlet pipe, passes through 1/5 of the radius, and connects to a single diversion wall at 2/5 of the radius. The last diversion wall is at a radius of 4 It ends at /5 and meets a single diversion wall at 3/5 of the radius. The diversion wall is a volute structure, thus ensuring the circulation of the cloth. The water outlet of the water inlet pipe is opposite to the water outlet of the biogas tank, and the volute-shaped diversion wall ends at the farthest end relative to the water outlet of the biogas tank, that is to say, the end of the volute-shaped diversion wall is at the The opposite side of the digester outlet. The utility model uses a volute-shaped diversion wall in which the raw material flows in one circle, and if it is too short, it has little effect and if it is too long, it is unnecessary. Therefore, the length of the diversion wall can be determined according to the situation. If the water quality is good in solubility, the length of the diversion wall can be longer. If the feces and other manure with high SS content are treated, the length of the diversion wall should be shortened to avoid blockage and sedimentation. The construction height of the volute-shaped diversion wall should be higher than the body of the biogas digester, but not more than 1/3 of the arch height of the gas chamber of the biogas digester. Please refer to the data in Table 1.

The volute-shaped diversion wall is provided with shell-breaking teeth (Fig. 4), and the structure of the shell-breaking teeth is such that the volute-shaped diversion wall is a brick-concrete structure, and the bricks are standard bricks. The main wall is 120mm wide and built on the bottom of the convex biogas tank. There are no cracking teeth within the wall height of 300mm under the volute-shaped diversion wall. Build a side vertical brick horizontally with the length of 120mm. Since the brick is 240mm long, the side vertical bricks protrude from both sides of the volute-shaped diversion wall by 60mm respectively, thereby forming shell-breaking teeth. Broken shell teeth are arranged in a cross, staggered arrangement. Only within 300mm below the volute-shaped diversion wall, the shell-breaking teeth are not needed, and the shell-breaking teeth are arranged crosswise from more than 300mm below the volute-shaped diversion wall. Because there are shell-breaking teeth on both sides of the volute-shaped diversion wall, the crust of the biogas digester is automatically broken.

The main body of the biogas digester is a closed cement pond composed of a cylinder and a hemisphere. It is an airtight tank structure. The data structure of the cylinder and the upper hemisphere of the biogas digester is shown in Table 1, which is consistent with the traditional hydraulic biogas digester. It's just the water inlet combined with the sunroof. The bottom of the biogas digester cancels the concave structure of the traditional biogas digester, because it is not conducive to the discharge of biogas residues. The bottom of the biogas pond of the utility model adopts a convex structure, which on the one hand facilitates the circulation of raw materials from the water inlet to the edge, and on the other hand avoids the problem that the biogas residue cannot be discharged outside at the bottom of the biogas pond. The sagittal height of the convex bottom of the biogas pool of the utility model is 200-300mm (see Table 1), so that the circulation can be carried out smoothly. Another feature of the construction of the biogas tank bottom of the utility model is that there is a 5% slope at the bottom of the biogas tank, and this slope goes to the water outlet of the biogas tank, thereby ensuring the smooth flow of the biogas slurry and biogas residue. Through the above circulation device and 5% gradient direction, the problem of biogas slag discharge is solved (accompanying drawing 1). Set up a steady flow wall 0.5 meters in front of the biogas digester outlet to ensure longer and effective anaerobic sludge can stay in the biogas digester. The height of the steady flow wall is 0.5 meters, and the length is 1/3 of the width of the biogas digester-2 times of the width of the water outlet.

The water outlet is a rectangular water outlet set at the end of the biogas digester. It is located in the center of the rear wall of the biogas digester and is the outlet of the treated water. Below the center of the end of the rear wall of the biogas digester is a rectangular outlet with a width of 1 meter and a height according to The design pressure of the biogas digester depends on the design pressure. Generally speaking, the top of the water outlet is at least 1 meter away from the top cover of the biogas digester, which constitutes the gas chamber of the circulation cloth biogas digester of the present utility model and ensures the stability of the biogas pressure. . The water outlet room is a rectangular parallelepiped pipe with a radius of 1 meter or a length and width of 1 meter outside the water outlet, and the height is higher than the water outlet; the water pressure room is used for gas production and water pressure adjustment outside the water outlet room The size is 1/3 of the gas chamber of the advective distribution biogas digester. It is generally set as a circle with a diameter equal to the radius of the biogas digester or a square with a length and width equal to the radius of the biogas digester, and a depth of about 1 meter. The upper cover of the water pressure room needs to use a protective device to avoid human hazards. The general protective device is a cement cover with a 1-meter square hole in the middle. The square hole is used to discharge biogas residue and biogas slurry. Biogas residue and biogas slurry can be used as fertilizer.

Claims (2)

1. A circular distribution biogas digester, including three parts: the water inlet movable cover system, the biogas digester main body and the outlet water pressure room system; It is characterized by: The water inlet movable cover system includes a water inlet (skylight) and a central water inlet pipe. The water inlet system adopts the skylight to enter water without a special water inlet. The central water inlet pipe directly enters the bottom center of the digester; The main body of the biogas digester is a spherical closed tank, which is divided into two parts, one is the upper hemisphere of the biogas digester, and the other is the cylinder of the biogas digester; The water outlet water pressure room system has a water outlet, a water outlet room and a water pressure room; 2. The circulating material biogas digester according to claim 1, characterized in that the bottom of the biogas digester does not adopt a concave hemispherical shape, but a slightly convex structure, and a volute-shaped structure is arranged on the convex structure. The diversion wall, the volute-shaped diversion wall is equipped with cracking teeth, the purpose is to cause the circulation distribution function, increase the length of the distribution water flow, enhance the hydraulic flow range and increase the mixing of waste water, and automatically remove the formed surface crust.

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