CN201077838Y - Methane tank - Google Patents

Abstract

The utility model discloses a marsh gas tank, which comprises a glass fibre reinforced plastic spherical thin shell structured fermentation chamber and a water pressure acidization pool; wherein, a feeding device and a discharge device are arranged on the fermentation chamber; a manhole, a vent hole and a manhole cover are arranged on the top part of the fermentation chamber; a feed pipe and a discharge pipe are arranged on the bottom of the feeding device and the discharge device respectively, which are extended into the intracavity of the fermentation chamber; two security covers are arranged on the upper part of the feeding device and the discharge device respectively; the feeding device and the discharge device are connected with the water pressure acidization pool through the communicating pipe on which a one-way valve is arranged respectively; an overflow pipe is arranged on the upper part of the discharge device; the water pressure acidization pool is divided into a hydrolysis acidization pool and a human and livestock feces flow tank by a baffle with filter holes; a security cover plate is arranged on the upper part of the water pressure acidization pool. The utility model has the advantages of light weight, adopting crop straw as material, convenient feed and discharge, low building, and long service life.

Description

a digester

technical field

The utility model relates to a biogas pool, in particular to a fiberglass biogas pool suitable for rural farmers.

Background technique

At present, there are two types of biogas digesters built in rural areas: one is directly built with bricks, concrete is cast on site, and cement mortar is used as a binding material. One is to make prefabricated panels with reinforced concrete, and then transport them to the site for splicing and bonding with cement mortar. To complete the construction and installation of a biogas digester, spare materials such as cement, sand, stones, bricks, etc. are needed, especially in rural areas in mountainous areas or farmers far away from the source of raw materials to build a biogas digester, material preparation, transportation, labor-intensive, time-consuming, construction The cost is high, and the economic affordability of farmers is limited. For the above two pool construction modes, the pool body is difficult to be airtight, and a little carelessness can easily cause air leakage.

Most of the biogas digesters currently in use use human and livestock manure as the fermentation material. However, most farmers have very few livestock, which cannot meet the needs of the biogas digesters. However, the use of cellulose fermentation such as straw and straw has the problems of slow gas production and difficult discharge. These are important factors that cause the slow progress in the construction of biogas digesters in rural energy development. The burning of straw and straw brings Environmental pollution has always been difficult to eliminate.

Utility model content

Aiming at the defects in the prior art, the purpose of the utility model is to provide an improved biogas digester. It has the advantages of light weight, using crop straw as the main raw material, convenient feeding and discharging, low construction and long service life.

In order to achieve the above purpose, the technical solution adopted by the utility model is: the biogas digester is composed of a fermentation room with a glass-steel spherical thin shell structure and a hydraulic acidification tank; Air outlet and manhole cover; the bottom of the feeding device and the discharging device have feeding pipes and discharging pipes extending into the inner cavity of the fermentation room, and the upper part is equipped with a safety cover; the feeding device and the discharging device are respectively equipped with The connecting pipe of the one-way valve is connected with the hydraulic acidification tank, and the upper part of the discharge device is provided with an overflow pipe; the hydraulic acidification tank is divided into a hydrolytic acidification tank and a human and animal manure sedimentation tank by a partition with filter holes. Safety cover.

FRP has the characteristics of high strength, light weight, corrosion resistance, aging resistance and good sealing. The fermentation room is made of glass fiber reinforced plastic and designed to be circular, with reasonable structure and good stress condition. It is made of industrialized glass fiber reinforced plastic, which can be standardized for production and assembled on the construction site. Therefore, the biogas digester has the characteristics of light weight, convenient transportation and installation, good air tightness, no leakage, corrosion resistance and long service life.

The biogas anaerobic fermentation process is divided into three major steps: hydrolysis, acidification and methane production. According to this theory, the hydraulic chamber of the standard hydraulic biogas digester is expanded into a hydraulic acidification pond with dual functions of hydrolysis acidification and air pressure adjustment. Made of concrete material. The two ends of the hydraulic acidification tank are respectively connected with the feed hopper and discharge hopper of the FRP biogas digester, and are installed with one-way valves, so that the liquid in the hydraulic acidification tank can only flow back into the fermentation room from the feed device, and cannot flow from the feed device to the fermentation room. The discharge part is installed into the fermentation room; the liquid in the fermentation room can only flow into the hydraulic acidification room from the discharge device, but cannot flow into the hydraulic acidification tank from the feed device. When the air pressure in the fermentation room rises, the fermentation liquid in the fermentation room passes through the discharge device and flows to the hydraulic acidification tank through the one-way valve; when the air pressure in the fermentation room drops, the liquid in the hydraulic acidification tank passes through the acidification tank and the feeding device The connecting pipe and the one-way valve flow into the fermentation room, thus forming a one-way circulating material-liquid flow system. The rise and fall of the biogas pressure in the fermentation room completes the liquid circulation of the entire biogas system and stirs the fermentation liquid in the fermentation room. Because the upper spherical shell of the fermentation room is arc-shaped, the fermentation liquid in the fermentation room rises and falls, making the fermentation liquid level increase every hour, thereby breaking the crust on the liquid surface of the fermentation room. A partition with filter holes is installed in the hydraulic acidification tank, so that during each cycle, the liquid in the acidification tank flows back into the fermentation room through the one-way valve and the feed pipe, while the raw materials and residues that have not been hydrolyzed and acidified remain in the water. pressure acidification pool. The fibrous raw materials are hydrolyzed and acidified in the open acidification tank. The acidification liquid enters the fermentation room to ferment and produce gas automatically through the one-way valve. The remaining residue mainly composed of lignin is completely decomposed in the hydraulic acidification tank and directly Take it out, thus solving the technical problem that the fibrous raw material is difficult to enter the tank for fermentation and discharge. It also achieves the purpose of using the power of the produced biogas to realize the automatic stirring and automatic circulation of the fermentation liquid in the fermentation room.

Advantage of the utility model:

1. FRP has the characteristics of high strength, light weight, corrosion resistance, aging resistance and good sealing. The FRP fermentation room is designed to be circular, with reasonable structure and good stress condition. It is made of industrialized FRP, standardized production, and assembled on the construction site. Therefore, the biogas digester has the characteristics of light weight, convenient transportation and installation, good air tightness, no leakage, corrosion resistance and long service life.

2. Complete the two stages of hydrolysis and acidification of fibrous raw materials in the open acidification tank. The acidification solution automatically enters the fermentation room to ferment and produce gas through the one-way valve, and the remaining residue mainly composed of lignin is completely decomposed in the hydraulic acidification tank. After that, it is directly taken out, thereby solving the technical problem that the fibrous raw material is difficult to enter the tank for fermentation and discharge.

3. Relying on the power of biogas produced by the fermentation of biogas raw materials, automatic stirring, automatic circulation and automatic shell breaking are realized.

4. The integration of the water pressure room and the acidification tank simplifies the structure of the biogas tank. The hydrolysis and acidification process is carried out outside the fermentation room. In the fermentation room of the same specification, the effective volume increases. In the process of use, it occupies a small area, is convenient to bury, and is fast in construction, which can meet the needs of different regions and different geographical environments. There is no need to maintain the pool body during use.

5. It can be produced industrially, with standardized standards and stable quality;

6. When the temperature is low in winter, the freezing of the ground may cause damage to the concrete biogas, while the fiberglass biogas digester has certain elasticity and will not be squeezed by the frozen soil.

7. The thermal conductivity of FRP is 1.42kj (m.h.℃), and the thermal conductivity of concrete is 5.44kj/(m.h.℃). It can be seen that the heat loss of FRP is much less than that of concrete, so a higher gas production rate is guaranteed.

8. The fiberglass biogas digester is anti-aging and corrosion-resistant, and its service life can be as long as 30 years.

Further illustrate the technical scheme of the utility model below in conjunction with accompanying drawing.

Description of drawings

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

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a left side view of Fig. 1 .

Figure 4 is a view from A-A in Figure 3

Detailed ways

See Fig. 1 to Fig. 4, the biogas digester of the present utility model is made up of the fermentation room of glass fiber reinforced plastic spherical thin shell structure and the concrete hydraulic acidification tank; The connection of 4 and 5 adopts the buckle tenon method. The upper hemisphere 4 of the fermentation room is equipped with a feeding device and a discharging device, and the top is provided with a manhole 10, an air outlet 11, and a manhole cover 12; the upper part of the feeding device and the discharging device is The bucket-shaped body is the feed hopper 2 and the discharge hopper 7 respectively. The upper parts of the feed hopper 2 and the discharge hopper 7 are equipped with safety covers 1 and 9, and the bottom of the feed pipe 3 and the discharge pipe 6 extend into the fermentation room. Chamber, feeding device and discharging device are respectively connected with the water pressure acidification tank through connecting pipes 14, 15 provided with check valves 13, 16, wherein the upper part of the discharge hopper 7 is provided with an overflow pipe 8; There is a dividing plate 19 with filter holes 21, and is divided into a hydrolysis acidification tank 17 and a human and livestock manure sedimentation tank 20 by the dividing plate 19, and a safety cover plate 18 is provided on the upper part of the hydraulic acidification tank.

Cellulosic raw materials such as rice straw, forage, and stalks are put into the hydrolysis acidification pool 17 for stack retting, and water is put into the required water level. The human and animal manure is connected to the human and animal manure sedimentation tank 20 . When the biogas pressure generated in the fermentation room rises, the fermentation hydraulic pressure in the fermentation room is sent to the feed hopper 2 and the discharge hopper 7. In the feed hopper 2, due to the effect of the one-way valve 13, the fermentation liquid in the feed hopper 2 cannot flow into it. In the human and livestock manure sedimentation tank 20, the fermented liquid in the discharge hopper 7 flows in the hydrolytic acidification tank 17 through the one-way valve 15, and the liquid in the hydrolytic acidification tank flows into the human and animal manure sedimentation tank 20 through the filter partition 19, and in the hydraulic acidification tank The liquid level of the liquid increases with the pressure of the biogas in the fermentation room. When the liquid levels in the feed hopper 2, discharge hopper 7, and hydraulic acidification tank reach the overflow pipe 8 of the discharge hopper 7, the excess liquid Flow out from the overflow pipe 8. When the biogas pressure in the fermentation room drops, the liquid in the feed hopper 2 and the discharge hopper 7 flows back into the fermentation room, and because of the effect of the one-way valve 15, the liquid in the hydrolytic acidification tank 17 cannot flow into the discharge hopper through the connecting pipe 16; The hydrolyzed and acidified liquid of the raw material in the hydrolytic acidification tank 17 flows into the human and animal manure sedimentation tank 20 through the filter partition 19, and flows into the feed hopper 2 through the connecting pipe 14 and the one-way valve 13 together with the liquid in the human and animal manure sedimentation tank 20. fermentation room. The sediment in the human and livestock manure sedimentation tank 20 and the unhydrolyzed and acidified raw materials in the hydrolytic acidification tank 17 are still left in the hydraulic acidification tank to continue to be hydrolyzed and acidified, and can be directly taken out after being completely decomposed, which facilitates the entry and exit of cellulose raw materials , and does not affect the continuous gas production of the biogas digester due to the incoming and outgoing materials.

Claims (1)

1. a methane-generating pit is characterized in that being made up of the sweathouse and the hydraulic pressure acidification pool of glass reinforced plastic thin spherical shell structure; Sweathouse is provided with feeding unit and drawing mechanism, and the top is provided with manhole, production well, manhole plate; The bottom of feeding unit and drawing mechanism has feed-pipe and discharge nozzle to stretch into the sweathouse inner chamber respectively, and top is equipped with relief cover; Feeding unit links to each other with the hydraulic pressure acidification pool by the communicating pipe that is provided with check valve respectively with drawing mechanism, and wherein the top of drawing mechanism is provided with upflow tube; The hydraulic pressure acidification pool is separated into hydrolysis acidification pool, people's animal manure settling tank by the dividing plate of band filter pore, and top is provided with safety cover plate.

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