JPS60197298A - Methane fermentation equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to improvements in methane fermentation equipment.

Conventional structure and problems Methane fermentation equipment has been widely used by farmers and livestock farmers, but because it uses microbial reactions, its maintenance requires specialized knowledge and is difficult. In other words, a methane fermentation device burns the fermentation gas generated from the methane fermentation tank to extract energy, heat the inside of the methane fermentation tank, and create optimal growth conditions for the microorganisms in the internal digestive fluid. However, if the state of the digestive fluid changes due to some condition, the composition of the fermentation gas changes. Fermentation gas typically consists of 60% OH4 and about 40% CO2. On the other hand, even if the burner used to combust this fermentation gas is a universal burner with a wide flammability range, if the concentration of non-flammable 002 exceeds about 45%, continuous combustion will not be possible. The problem is that the fermentation gas is no longer able to maintain its own heat, making it impossible to maintain optimal growth conditions for microorganisms in the digestive juices, and as a result, even more C.
This creates a vicious cycle of decreasing H4 concentration.

Therefore, a methane fermentation device that does not cause the above-mentioned vicious cycle and is easy to maintain and manage has been desired.

OBJECTS OF THE INVENTION The present invention overcomes the drawbacks of the conventional method and provides a methane fermentation device that is easy to maintain and manage.

Structure of the Invention The present invention has a structure in which a methane gas concentrator equipped with a carbon dioxide gas permeable membrane is provided in a piping circuit for fermentation gas generated from a methane fermentation tank. The above methane gas concentrator has a carbon dioxide gas permeable membrane with one side in contact with fermentation gas and the other side open to the atmosphere. This configuration allows the fermentation gas to always be maintained at a methane concentration that allows for combustion, and also facilitates maintenance and management.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 1st
In the figure, 1 is a methane fermentation tank, 2 is a methane concentrator installed in a piping circuit connected to the methane fermentation tank 1, and 3 is a device that temporarily stores concentrated fermentation gas and applies pressure to the gas in the fermentation gas circuit. An additional gas tank, 4 a gas pressure switch for detecting the gas pressure, and 6 a gas extinguisher 9 such as a gas boiler for burning the concentrated gas. 6 is an exhaust device of the methane concentrator 2.

Figure 2 is a partial cross-sectional view of the methane concentrator 2, where 7 is the fermentation gas outlet and inlet, and 8 is carbon dioxide gas coated with about 0.1μ dimethyl silicone on a 26μ carrier without pinholes. A permeable membrane 9 is a pressure dispersion layer that distributes pressure so that a uniform pressure is applied to the carbon dioxide gas permeable membrane 8, and 10 is a gas discharge port 1 for transmitting carbon dioxide permeated from the carbon dioxide gas permeable membrane 8.
This is a gas permeable body that guides the gas to 1 and is made of open foam.

The gas outlet 11 communicates with the exhaust device 6, sucks in carbon dioxide gas, and releases it into the atmosphere.

Next, the operating principle of an embodiment of the present invention will be explained.

The fermentation gas generated in the methane fermentation ladle 1 enters the methane concentrator 2 and comes into contact with the surface of the carbon dioxide permeable membrane 8. The carbon dioxide gas permeable membrane 8 is made of dimethyl silicone and is CO
The transmission coefficient of 2 is approximately 300X10-10"4-8°.

The permeability coefficient of CH4 for Iig is approximately 50X10"-'°
0c/, L, sea-cm H, 9.

Approximately 150a+ is placed on the fermentation gas side of the carbon dioxide permeable membrane 8.
The pressure on the other side is maintained at a pressure of 20 mm H, compared to the fermentation gas pressure by the exhaust device 6. ? Since the positive pressure is kept low, CO2 in the fermentation gas passes through the carbon dioxide permeable membrane 8 and is discharged to the atmosphere via the gas discharge port 11.

On the other hand, most of the methane gas is led from the output lower to the gas tank 3 and the gas consumption device 6.

In this embodiment, two carbon dioxide gas permeable membranes 8 of 30CrIL×30CrfL are used, and when these are connected to the exhaust device 6 of approximately -50ONllH,9, approximately "'/win at room temperature.
of CO2 could be emitted. Although an example is shown in which a dimethyl silicone thin film is used as the carbon dioxide gas permeable membrane 8, it is obvious that it is not limited to the dimethyl silicone thin film as long as it achieves the same purpose. In the present invention, by incorporating a methane concentrator into the system, it is possible to maintain the fermentation gas at a combustible methane concentration at all times, and in the unlikely event that the growth state of microorganisms in the digestive fluid changes and the fermentation gas composition changes. Even if the temperature changes, self-heat retention can be maintained, and the growth temperature condition of microorganisms will not deteriorate and the growth conditions will not deteriorate any further, and it will be possible to return to the original state by optimizing the growth conditions due to the self-healing power of microorganisms. . Therefore, the methane fermentation device can be maintained and managed without requiring the knowledge of experts. Furthermore, since a carbon dioxide gas-permeable membrane is used for methane concentration, no special maintenance is required (Fj'Q is also available, which is of great industrial value).

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the device of the present invention, and FIG.
The figure is a cross-sectional view showing the methane concentrator of the same device. 1... Methane fermentation tank, 2... Methane concentrator, 8... Carbon dioxide permeable membrane. Name of agent: Toshio Nakao, 5μ accountant, and one other person Figure 1 4 Figure 2

Claims (1)

[Claims] A methane concentrator is installed in the piping circuit for the fermentation gas generated from the methane fermentation tank, and the methane concentrator is equipped with a carbon dioxide permeable membrane having one side in contact with the fermentation gas and the other side open to the atmosphere. A methane fermentation device.