CN201224729Y - Methane two-phase anaerobic fermentation gas stirring system - Google Patents

Abstract

The utility model relates to a two-phase biogas anaerobic fermentation gas mixing system belonging to the field of biogas generating equipment; a gas return pipe and an inlet pipe are arranged between a hydrolytic acidification tank and a gas generating tank; both ends of the gas return pipe are connected with the upper part of the hydrolytic acidification tank and the lower part of the gas generating tank respectively; both ends of the inlet pipe are connected with the lower part of the hydrolytic acidification tank and the upper part of the gas generating tank respectively; an air pump and an one-way valve are positioned at the inlet pipe; a normally open solenoid valve is arranged at the position of a gas collecting pipe between the hydrolytic acidification tank and the gas generating tank. The gas mixing system has the advantages of simple structure, easy operation, stable operation, smooth gas production process, high gas production and good quality.

Description

Biogas two-phase anaerobic fermentation gas mixing system

technical field

The invention belongs to biogas generating equipment, and mainly relates to a gas stirring system for two-phase anaerobic fermentation of bioenergy biogas.

Background technique

Energy and environmental issues have become two prominent issues in today's society. Under the circumstances of decreasing non-renewable energy sources and increasing costs, people began to maximize the use of biomass resources to supplement energy shortages, and they can use biomass resources At the same time, it eliminates pollution to the environment, and anaerobic fermentation is a technology that can turn agricultural and animal husbandry waste into energy and perform harmless treatment. Therefore, in order to improve the efficiency and stability of the anaerobic fermentation system, various methods and measures have been studied. At present, the anaerobic fermentation technology used mainly includes single-phase anaerobic fermentation technology and two-phase anaerobic fermentation technology. Compared with single-phase anaerobic fermentation technology, two-phase anaerobic fermentation technology has faster fermentation speed and stable system operation. and other advantages, but this process also has some problems to be solved urgently. For example, in the existing two-phase anaerobic fermentation system, due to the simple direct connection of pipelines between the hydrolysis acidification tank, the gas production tank and the gas collection tank structure, that is, the hydrolytic acidification tank, gas production tank, and gas collection tank are connected by the same pipeline. The hydrolytic acidification process in the hydrolytic acidification tank will generate a large amount of hydrogen, and the methanogenic bacteria in the hydrolysis acidification tank are very few. The generated hydrogen degradation is very small, which gradually increases the hydrogen partial pressure in the hydrolytic acidification tank, and the increase of hydrogen partial pressure directly leads to the accumulation of propionic acid, which in turn affects the stability of the hydrolytic acidification tank and the subsequent methane production process. In addition, during the fermentation process, in order to make the fermentation material fully contact with the bacteria and prevent the top of the fermentation material from crusting, it is necessary to regularly stir the materials in the hydrolysis acidification tank and the gas production tank, and the operation process is complicated. .

Contents of the invention

The purpose of the invention is to solve the problems existing in the above-mentioned prior art, and to design and provide a biogas two-phase anaerobic fermentation gas stirring system with a new structure, so as to increase the biogas output and ensure the stable and rapid operation of the fermentation process.

The basic design of the present invention is that the biogas two-phase anaerobic fermentation gas mixing system includes a hydrolysis acidification tank, a gas production tank, a gas collection tank and a gas collection pipe connected between the hydrolysis acidification tank, the gas production tank and the gas collection tank , between the hydrolytic acidification tank and the gas production tank, a gas return pipe and an air intake pipe are installed in connection. The upper part of the gas tank is connected, an air pump and a one-way valve are installed on the intake pipe, and the normally open solenoid valve is installed on the gas collecting pipe, which is located at the gas collecting pipe between the hydrolysis acidification tank and the gas production tank.

The present invention has the following characteristics: ①. While performing gas agitation on the hydrolysis acidification tank body, the gas agitation process is also completed on the gas production tank body; ②. Gas stirring, so that the gas with higher methane content will replace the gas with higher hydrogen content in the hydrolysis acidification tank, so that the hydrogen partial pressure in the hydrolysis acidification tank will be reduced, because propionic acid can only be converted to acetic acid when the hydrogen partial pressure is low , so the reduction of hydrogen partial pressure increases the content of acetic acid in the hydrolytic acidification tank, reduces the content of propionic acid, avoids the accumulation of propionic acid in the hydrolytic acidification tank, increases the stability of the operation of the hydrolysis acidification tank, and is also conducive to subsequent production The methane process goes smoothly; ③. While the gas in the gas production tank is used to stir the hydrolysis acidification tank, the gas with high hydrogen content in the hydrolysis acidification tank enters the gas production tank and stirs the gas production tank, because The interaction between hydrogen and carbon dioxide is also a way to produce methane, so the hydrogen in the gas with high hydrogen content in the gas production tank also participates in the process of producing methane, which increases the production of methane; ④, Simple structure, easy operation, easy operation Good quality, reliable operation, less faults.

Description of drawings

The accompanying drawing is a schematic diagram of the overall assembly structure of the biogas two-phase anaerobic fermentation gas mixing system;

Description of part number in the figure:

1. Hydrolysis and acidification tank, 2. Normally open solenoid valve, 3. Air collecting pipe, 4. Air return pipe, 5. Gas production tank, 6. Air pump, 7. Gas collecting tank, 8. One-way valve, 9. Intake pipe.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The biogas two-phase anaerobic fermentation gas mixing system includes a hydrolysis acidification tank 1, a gas production tank 5, a gas collection tank 7, and a gas collection pipe 3 connected between the hydrolysis acidification tank 1, the gas production tank 5, and the gas collection tank 7. Between the hydrolytic acidification tank 1 and the gas production tank 5, a gas return pipe 4 and an air intake pipe 9 are connected and installed. It is connected with the lower part of the hydrolytic acidification tank 1 and the upper part of the gas production tank 5, equipped with an air pump 6 and a one-way valve 8 on the intake pipe 9, and the normally open solenoid valve 2 is installed on the gas collection pipe 3, which is located between the hydrolysis acidification tank 1 and the gas production tank 5 between the 3 parts of the air collector.

When the fermentation operation does not carry out gas stirring, the gas generated in the hydrolysis acidification tank 1 enters the gas collection tank 7 through the normally open solenoid valve 2, and the gas in the gas production tank 5 enters the gas collection tank directly through the gas collection pipe 3 at the top 7; when the gas is stirred, the air pump 6 starts, and the gas with a higher methane content in the gas production tank 5 is sent from the bottom of the hydrolysis acidification tank 1 into the hydrolysis acidification tank 1, and the normally open solenoid valve 2 is closed at the same time, and then the gas is hydrolyzed. The air pressure in the acidification tank 1 rises, and the gas in the hydrolysis acidification tank 1 returns to the gas production tank 5 from the bottom of the gas production tank 5 under the action of air pressure. After stirring for a period of time, turn off the air pump 6 and open the solenoid valve 2 at the same time Return to normal open state.

Claims (1)

1. A biogas two-phase anaerobic fermentation gas mixing system, comprising a hydrolysis acidification tank (1), a gas production tank (5), a gas collection tank (7) and a hydrolysis acidification tank (1), a gas production tank ( 5), the gas collecting pipe (3) between the gas collecting tanks (7), is characterized in that a gas return pipe (4) and an air inlet pipe ( 9), the two ends of the air return pipe (4) are respectively connected with the upper part of the hydrolytic acidification tank (1) and the lower part of the gas production tank (5), and the two ends of the air inlet pipe (9) are respectively connected with the lower part of the hydrolysis acidification tank (1) and the gas production tank (5) The upper part is connected, an air pump (6) and a one-way valve (8) are installed on the intake pipe (9), and the normally open solenoid valve (2) is installed on the gas collecting pipe (3), located in the hydrolysis acidification tank (1) At the position of the gas collecting pipe (3) between the gas production tank (5).

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