CN102533531A - Passive shell breaking device of methane tank - Google Patents

Abstract

A passive shell breaking device for biogas tanks. It belongs to the field of renewable energy production. The big head of the throat (11) is connected to the straight pipe (10), the other end of the straight pipe (10) is inserted into the collecting chamber (9) and connected, and one end of the hollow column (13) is connected from the collecting chamber The bottom of (9) is inserted and connected, the other end of the hollow column (13) is connected with the overflow pipe (3) through the connecting pipe (14), and the outlet end of the overflow pipe (3) sinks into the overflow pool (4 ) below the liquid surface. The collecting chamber (9) is connected with the tray (6) through the rotating part (7) and the sealing part (8), and the tray (6) is connected with the outer circle of the hollow column (13). Utilizing the gravity and suction of the biogas slurry discharged through the overflow pipe, the biogas slurry forms a reverse thrust at the entrance of the throat, so that the stirring unit rotates to cut the crust layer, so no additional power source is needed for breaking the crust. The structure is simple and stable, the shell breaking performance is good, and the adaptability is strong.

Description

A biogas tank passive shell breaking device

technical field

The invention relates to equipment used in a biogas tank, in particular to a passive shell breaking device for a biogas tank. It belongs to the field of renewable energy production.

Background technique

Biogas is a combustible gas produced by microbial fermentation of organic matter under anaerobic conditions. As a renewable clean energy, biogas can replace not only traditional biomass energy such as straw and firewood, but also commodity energy such as coal, and its energy efficiency is significantly higher than that of straw, firewood and coal. Therefore, biogas is widely used in industrial production and people's life. There are tens of millions of household biogas digesters in the rural areas of our country alone, and large and medium-sized biogas projects that ferment large wastes are also widely used in sugar factories and wineries. In the biogas digester, fermented dung and grass are not only easy to obtain biogas, but also easy to cause crusting on the liquid surface in the pond. After encrusting, biogas cannot enter the air chamber through the scum layer on the liquid surface, but runs away from the inlet and outlet pipes, which makes the utilization rate of raw materials very low and wastes a lot. Therefore, the crusting of biogas digesters is a big problem that is technically difficult to solve. In order to solve this big problem, various stirring measures such as liquid flushing method, air flushing method, or installation of levers, or installation of siege baskets, or uncovering the pool cover to break the crust layer, or removing scum, etc. have been used in the past. Does not solve the problem very well. The prior art adopts a manual stirring method, such as Chinese patent notification number: CN201182978Y, date of announcement: January 21, 2009, title of invention: "bigas digester broken shell agitator", which consists of a support frame, a stirring blade, The transmission shaft, the turning handle and other parts are composed, and the mixing blade is turned by turning the handle, so as to achieve the purpose of breaking the shell. The existing technology can barely do the job when the shell of the household biogas digester is broken, but if it is used for large and medium-sized biogas projects, it will not be able to do what it wants. Therefore, the current large and medium-sized biogas projects mainly use dynamic stirring methods to solve the problem of biogas tank crusting, and hydraulic circulation stirring systems and mechanical stirring systems are commonly used. Although these methods can solve certain incrustation problems in biogas digesters, they all need to consume power, have a power source, and all have deficiencies. For example, in the hydraulic circulation mixing system (side mixing system), in the application of large and medium-sized biogas projects, the location of shell breaking is often concentrated, and the overall shell breaking effect is poor, which affects the normal output of biogas; another example, the shell breaking of the mechanical side stirring system is partial shell breaking It cannot have an effect on the distal crust, and the mechanical movement produces vibration and the propeller effect of the shell breaking device, which affects the sealing performance of the reaction tank and causes distortion and deformation of the tank.

To sum up, the existing technology adopts a method of manual stirring that cannot solve the problem of crusting in large and medium-sized biogas projects, while the method of dynamic stirring has poor overall shell breaking effect, which affects the normal output of biogas and is easy to produce The propeller effect of the cracking device causes the tank body to be twisted and even leaked.

Contents of the invention

The purpose of the present invention is to overcome the existing biogas shell breaking device. The stirring method cannot solve the crusting problem of large and medium-sized biogas projects. However, the dynamic stirring method has poor overall shell breaking effect, affects the normal output of biogas, and is easy to The propeller effect of the shell-breaking device is generated, causing the tank body to be twisted and even leaked, and a passive shell-breaking device for biogas tanks with a simple structure, no need for a power source, and low manufacturing cost is provided. It has few parts, good versatility, convenient installation and debugging, and can meet the needs of solving the crusting problem of large and medium-sized biogas projects.

In order to achieve the above object, the technical solution adopted by the present invention is: a passive shell breaking device for a biogas tank, including a biogas tank, a water inlet pipe, a stirring plate, and a support frame, and the support frame is connected to the tank body of the biogas tank. Several stirring units are installed on the support frame, and the stirring unit is composed of a tray, a rotating part, a sealing part, a collecting chamber, a straight pipe, a throat, a stirring piece, a hollow column, and a connecting pipe. It is connected with the small head of the throat, the big head of the throat is connected with the straight pipe, the other end of the straight pipe is inserted into the collecting chamber and connected, one end of the hollow column is inserted from the bottom of the collecting chamber, and the other end of the hollow column The connecting pipe is connected with the overflow pipe, and the outlet end of the overflow pipe sinks under the liquid surface of the overflow tank.

The collecting chamber is connected with the tray through the rotating part and the sealing part, and the tray is connected with the outer circle of the hollow column.

The outlet of the overflow pipe is lower than the bottom plane of the biogas tank and below the liquid level in the overflow tank, and the distance T from the bottom of the biogas tank to the outlet of the overflow pipe is greater than 1500 mm.

One end of the straight pipe is inserted into the collecting chamber, and the other end is tilted upwards to form an ascending angle ψ with the horizontal plane, and the ascending angle ψ is between 6° and 10°.

The big head of the throat is connected to the straight pipe, and is bent horizontally at the joint, such as an elbow, with a bending angle Φ of 40 to 50 degrees. The stirring plate is fan-shaped and contained in the small head of the throat. The outer elbow, the fan-shaped bottom of the stirring plate is flush with the throat centerline, and the fan-shaped top of the stirring plate is flush with the top of the outer elbow.

The water inlet pipe has two paths, and the outlet of one path is set on the critical liquid level A.

The joints of the pipelines between the throat opening and the outlet of the overflow pipe are sealed connections.

There are 3 stirring units evenly distributed in the biogas tank 1 .

Three straight pipes are evenly distributed in the collecting chamber 9 .

The shape of the inner cavity of the throat is that the mouth is small, and the inside is tapered. The size of the big end is the same as the inner hole of the straight pipe, and the size of the mouth is between 7/10 and 6/10 of the size of the big end. The shape length is 6 times the big end dimension.

The distance C from the mouth center of the throat to the critical liquid level A is greater than or equal to 50 mm.

Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Due to the large consumption of water in the biogas tank, fast evaporation, and water pressure, it is necessary to add water to the biogas tank frequently, and use the gravity of the biogas slurry to drain through the overflow pipe. And the suction force makes the biogas slurry form a reverse thrust at the entrance of the throat, thus forming the stirring unit to rotate. During the rotation process, the stirring also plays the role of cutting the crust layer to achieve the purpose of breaking the shell, so no additional power source is needed for breaking the shell. 2. The structure is simple and stable, the shell breaking performance is good, and the adaptability is strong.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a schematic diagram of a stirring unit of the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a cross-sectional view along line A-A of Fig. 3 .

In the figure: biogas tank 1, water inlet pipe 2, overflow pipe 3, overflow tank 4, stirring unit 5, tray 6, rotating part 7, sealing part 8, collecting chamber 9, straight pipe 10, throat 11, stirring Sheet 12, hollow column 13, connecting pipe 14, support frame 15, critical liquid level A, throat opening distance C, overflow pipe opening distance T, bending angle Φ, rising angle ψ.

Detailed ways

The present invention will be further described below with reference to the description of the drawings and specific embodiments, but it is not intended to limit the scope of protection thereof.

Referring to Figures 1 to 5, a biogas tank passive shell breaking device of the present invention includes a biogas tank 1, a water inlet pipe 2, a stirring plate 12, and a support frame 15, and the support frame 15 and the tank body of the biogas tank 1 Connection, several stirring units 5 are installed on the support frame 15, and the stirring unit 5 is composed of a tray 6, a rotating part 7, a sealing part 8, a collecting chamber 9, a straight pipe 10, a throat 11, and a stirring plate 12 , a hollow column 13 and a connecting pipe 14, the stirring plate 12 is connected to the small head of the throat 11, the big head of the throat 11 is connected to the straight pipe 10, and the other end of the straight pipe 10 is inserted into the collecting chamber 9 connected, one end of the hollow column 13 is inserted and connected from the bottom of the collecting chamber 9, the other end of the hollow column 13 is connected to the overflow pipe 3 through the connecting pipe 14, and the outlet end of the overflow pipe 3 sinks into the overflow pool 4 below the liquid level. The collecting chamber 9 is connected with the tray 6 through the rotating part 7 and the sealing part 8 , and the tray 6 is connected with the outer circle of the hollow column 13 .

The outlet of the overflow pipe 3 is lower than the bottom plane of the biogas tank 1 and below the liquid level in the overflow tank 4, and the distance T from the bottom of the biogas tank 1 to the outlet of the overflow pipe 3 is greater than 1500 mm.

One end of the straight pipe 10 is inserted into the collecting chamber 9, and the other end is tilted upwards to form an ascending angle ψ with the horizontal plane, and the ascending angle ψ is between 6° and 10°.

The big head of the throat 11 is connected to the straight pipe 10, and is bent horizontally at the junction, such as an elbow, with a bending angle Φ of 40 to 50 degrees. The stirring plate 12 is fan-shaped and contained in the throat. The outer elbow of the small head of the road 11, the lower edge of the fan shape of the stirring plate 12 is flush with the centerline of the throat 11, and the upper edge of the fan shape of the stirring plate 12 is flush with the top of the outer elbow.

The water inlet pipe 2 has two paths, and the outlet of one path is set on the critical liquid level A.

The connections between the throat 11 and the outlet of the overflow pipe 3 are all sealed connections.

There are three stirring units 5 evenly distributed in the biogas tank 1 .

Three straight pipes 10 are uniformly inserted into the collecting chamber 9 .

The shape of the inner cavity of the throat 11 is a small mouth, a large tapered inside, the size of the big end is the same as the inner hole of the straight pipe 10, and the size of the mouth is between 7/10 and 6/10 of the size of the big end , the tapered length is 6 times the size of the big end.

The distance C from the mouth center of the throat 11 to the critical liquid level A is greater than or equal to 50 mm.

In the present invention, biogas liquid enters into the collecting chamber 9 through the throat 11, and then flows into the overflow pool 4 through the vertical overflow pipe 3. During the discharge process of the biogas slurry through the overflow pipe 3, the gravity and suction of the biogas slurry make the biogas slurry flow in a closed pipeline. According to the fluid continuity theorem: when the fluid flows continuously and stably through a For pipes of different thicknesses, since the fluid in any part of the pipe cannot be interrupted or squeezed, the mass of fluid flowing into any section is equal to the mass of fluid flowing out of the other section at the same time. Therefore, the cross section of the mouth of the throat 11 is the smallest, and the flow rate of the biogas slurry is the fastest, which is almost 2.5 times that of the pipeline. The stirring piece 12 is an arc-shaped piece, and the way between the stirring piece 12 and the small head of the throat 11 is welded or riveted. The inlet of the throat 11 is small, and the outlet is large. The speed of the action flow is accelerated, and a partial vacuum is formed at the upper end of the overflow pipe. The vacuum at the upper end will attract the biogas slurry to enter the overflow pipe at the throat 11. Due to the high-speed flow of the biogas slurry at the mouth of the throat 11, it will drag the inlet of the throat 11. The biogas slurry between the outside and the inner surface of the elbow of the stirring plate 12 also flows rapidly to the inlet of the throat 11, while the biogas slurry outside the elbow of the stirring plate 12 is relatively static. According to Bernoulli's theorem, when the fluid is flowing, the pressure is low where the flow velocity is high, and the pressure is high where the flow velocity is small. Therefore, the pressure of the biogas slurry outside the elbow of the stirring plate 12 is greater than the pressure of the biogas slurry on the inner surface of the elbow of the stirring plate 12, forming a pressure difference. The bending of the road 11 is driven by the rotation. During the rotation, the stirring blade 12 plays the role of cutting the encrustation layer of the biogas slurry to achieve the purpose of breaking the encrustation.

Referring to Figure 1, gravity and suction should be generated in the overflow pipe 3 during the process of allowing the biogas slurry to drain, thereby pulling the entrance of the throat 11 to form a reverse thrust, and the entire pipeline must be closed to form a siphon pull, otherwise If gas enters, it will directly affect the generation of rotational power. Therefore, there are two requirements for the outlet of the overflow pipe 3: one is to be lower than the bottom plane of the biogas tank 1, that is, the distance T of the overflow pipe mouth is formed, and the distance T of the overflow pipe mouth selected in this embodiment is greater than 1500 mm; Under the liquid level in the overflow tank 4, and will remain under the liquid level in the overflow tank 4 all the time.

The distance between the mouth center of the throat 11 and the critical liquid level A is the throat opening distance C, and the throat opening distance C is greater than or equal to 50 mm, which is 50 mm in this embodiment.

Referring to Fig. 2, according to the size of the biogas tank 1, the stirring unit 5 can be increased or decreased accordingly. The area of the biogas tank 1 is large, and the area of stirring and cracking the shell is also large, at least 2 symmetrically distributed, and up to 6 in the embodiment , according to the size of the biogas tank 1 selected in this embodiment, three stirring units 5 are selected.

Referring to Figure 3, when the rising angle ψ is less than 6 degrees, the mouth of the throat 11 is too close to the critical liquid level A, and it is easy to inhale air during the shell breaking stirring, and the stirring stops. When the rising angle ψ is at 10 degrees , the stirring plate 12 is lifted too high, which will cause insufficient stirring force, and the rising angle ψ selected in the present embodiment is 8 degrees.

Referring to Figure 4, the bending angle Φ and the shape of the stirring piece 12 can be adjusted within a certain range, but when the bending angle Φ is less than 40 degrees or greater than 50 degrees, the stirring force is obviously insufficient, and the bending angle Φ selected in this embodiment is 45 degree.

Two to four straight pipes 10 can be evenly inserted into the collecting chamber 9. The more straight pipes 10 inserted, the more throats 11 and stirring plates 12, the greater the stirring force. Of course, the overflow pipe must also be considered. 3, in this embodiment, three straight pipes 10 are uniformly inserted into the collecting chamber 9.

Referring to FIG. 5 , the tray 6 is fixed at the middle section outside the straight pipe 10 to restrict the downward movement of the rotating part 7 . What the rotating part 7 selects for use is a sealed bearing, and the inner hole of the sealed bearing is closely matched with the outer circle of the straight pipe 10 . The upper end of the rotating part 7 is connected with a sealing part 8, which includes an oil seal, a flange, a gasket, etc., to protect the sealed bearing from biogas slurry erosion and affect the normal rotation of the stirring unit 5. Of course, the sealing member 8 can also adopt other structures, which are all mature technologies and can be borrowed as much as possible.

Relevant components and requirements in the embodiment are:

The overflow pipe 3 is used after anticorrosion treatment of ordinary carbon steel pipes;

Bracing frame 15, adopts angle steel, material is common carbon steel angle steel, does anticorrosion treatment;

Stirring unit 5 is made of ordinary carbon steel, and anti-corrosion treatment is carried out after production;

Throat 11, according to the principle of jet flow, is made of carbon steel and then treated with anticorrosion;

The stirring plate 12 is made of carbon steel plate, and after being rolled according to the size and angle, it is treated with anticorrosion.

Although the present invention is to solve the problems encountered in large and medium-sized biogas projects, it is also fully applicable to small biogas digesters and the like. At the same time, the installation methods of other components in the biogas tank 1 of the present invention, such as the oil inlet pipe and the support frame, are the same as those of the prior art, and will not be described in detail herein. the

Claims (10)

1. passive hulling machine of biogas jar; Comprise biogas jar (1), water inlet pipe (2), stirring piece (12), bracing frame (15); Bracing frame (15) is connected with the tank body of biogas jar (1); It is characterized in that: described bracing frame (15) is gone up several agitating units (5) is installed; Described agitating unit (5) is made up of pallet (6), rotatable parts (7), sealing element (8), collecting chamber (9), straight tube (10), venturi (11), stirring piece (12), open tubular column (13), pipe connecting (14), and described stirring piece (12) is connected with the microcephaly of venturi (11), and the major part of venturi (11) is connected connection with straight tube (10); The other end of straight tube (10) inserts in the collecting chamber (9) and connects; One end of open tubular column (13) inserts from the bottom of collecting chamber (9) and connects, and the other end of open tubular column (13) is connected connection through pipe connecting (14) with upflow tube (3), and the exit end of upflow tube (3) sinks under the liquid level of run-off (4); Described collecting chamber (9) is connected with pallet (6) with sealing element (8) through rotatable parts (7), and described pallet (6) is connected with the cylindrical of open tubular column (13).

2. the passive hulling machine of a kind of biogas jar according to claim 1; It is characterized in that: the outlet of described upflow tube (3) is lower than biogas jar (1) baseplane; And be lower than in the overflow groove (4) under the liquid level, the overflow mouth of pipe of biogas jar (1) end to the outlet of upflow tube (3) apart from T greater than 1500 millimeters.

3. the passive hulling machine of a kind of biogas jar according to claim 1 is characterized in that: described straight tube (10) one ends insert collecting chamber (9), and the other end is upturned, and form ascending angle ψ between the horizontal plane, and ascending angle ψ spends to 10 degree 6.

4. the passive hulling machine of a kind of biogas jar according to claim 1 is characterized in that: the major part of described venturi (11) is connected with straight tube (10), and in the junction level to bending; Like ancon; Bending angle Φ be 40 the degree to 50 the degree, described stirring piece (12) is fan-shaped, is included in venturi (11) microcephaly's outer elbow; Described stirring piece (12) segmental is following concordant with venturi (11) medullary ray, and stirring piece (12) segmental top is concordant with outer elbow top.

5. the passive hulling machine of a kind of biogas jar according to claim 1, it is characterized in that: described water inlet pipe (2) has two the tunnel, and wherein one tunnel outlet is arranged on the critical liquid level A.

6. the passive hulling machine of a kind of biogas jar according to claim 1 is characterized in that: each the pipeline junction between the outlet of described venturi (11) mouthful to upflow tube (3) is and is tightly connected.

7. the passive hulling machine of a kind of biogas jar according to claim 1 is characterized in that: be evenly equipped with (3) individual agitating unit (5) in the described biogas jar (1).

8. the passive hulling machine of a kind of biogas jar according to claim 1 is characterized in that: be uniformly distributed with in the described collecting chamber (9) and insert 3 straight tubes (10).

9. the passive hulling machine of a kind of biogas jar according to claim 1; It is characterized in that: the cavity shape of described venturi (11) is that oral area is little; The taper that the inside is big; The endoporus of the big end same straight tube of size (10) is identical, finish dimensional be hold greatly size 7/10 to 6/10 between, taper length be to hold 6 times of size greatly.

10. the passive hulling machine of a kind of biogas jar according to claim 1 is characterized in that: the oral area center of described venturi (11) is more than or equal to 50 millimeters to the venturi mouth distance C of critical liquid level A.

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