JPS635833Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a methane fermentation device that uses livestock manure.

The conventional device described above includes a raw water tank that dilutes livestock manure and stores it, a heat exchanger that heats the raw water, a digestion tank that uses microorganisms to digest organic matter in the raw water into methane gas, and a It consists of a gas holder that stores the gas generated in the tank.
The above-mentioned gas holder is used to temporarily store the generated gas and equalize the gas concentration, as well as to stably supply gas to gas consuming equipment.
Since the conventional apparatus consists of many components as mentioned above, it has the disadvantage of increasing equipment costs.

In addition, some of the generated gas is used to send it to a heat exchanger that heats raw water in order to maintain a constant temperature inside the digester, where it is combusted to heat the digester. However, in such a device, if the gas holder is omitted from the point of view of equipment costs, when gas is distributed between the heat exchanger and the gas consumption equipment,
Various obstacles arise.

Therefore, as a result of studies in view of the above-mentioned conventional problems, the present invention not only uses a part of the generated gas to heat raw water and sends the rest to gas consuming equipment, but also uses a heat exchanger for heating raw water. By setting the gas combustion pressure of the device to be lower than the combustion pressure of the gas consuming equipment mentioned above, the concentration and amount of gas generated will be almost constant, and a gas holder can be omitted, reducing equipment costs. This is a methane fermentation device that aims to significantly reduce costs.

To explain in detail the drawings showing the embodiments of the present invention, raw water 1 in which livestock manure is diluted to an appropriate concentration is temporarily stored in a raw water tank 2, and is passed through a circulation path 3 by driving a pump P. The mixture is stirred uniformly by circulating flow, heated by the pump P through the preheater 5 in the treatment liquid tank 4, and further heated by the heat exchanger 7 disposed in the middle of the piping 6. It is heated and allowed to flow into the digestion tank 8, where the organic matter can be digested and produced into methane gas by methane-fermenting bacteria.

Furthermore, as the raw water flows into the digestion tank 8, the treated liquid 9 digested in the digestion tank 8 flows out of the overflow pipe 10 and flows into the treated liquid tank 4, so that the treated liquid 9 and Raw water 1 by preheater 5
is heated by heat exchange and further heated by the heat exchanger 7.

Next, the gas generated in the digestion tank 8 is transferred to the raw water 1.
so as to be supplied to the heat exchanger 7 to heat the
The burner 7a of the heat exchanger 7 and the upper part of the digestion tank 8 are connected by a pipe 11, and the pipe 1
1 can supply gas to the burner 12a of the gas consumption equipment 12 through a pipe 13, and the amount of gas supplied to the heat exchanger 7 is determined by detecting the temperature inside the digestion tank 8 with a temperature sensor 14. Then, a solenoid valve 15 disposed in the pipe 11 is controlled to be turned on and off so as to maintain a set temperature (for example, 35° C.).

In addition, a governor 1 is installed in both the pipes 11 and 13, respectively.
6 and 17 are arranged so that gas flows to the burner 7a of the heat exchanger 7 at a pressure of, for example, 50 mmAq or more, while the gas flows to the burner 12a of the gas consumption equipment 12 at a pressure higher than the above pressure, for example, 150 mmAq.
The configuration is such that gas is supplied at a certain pressure.

That is, the gas combustion pressure of the burner 7a in the heat exchanger 7 is set to be lower than the gas combustion pressure of the burner 12a in the gas consuming device 12.

As explained above, according to the methane fermentation apparatus according to the present invention, the gas generated in the digestion tank 8 is directly supplied to the heat exchanger 7 for heating raw water and the gas consumption equipment 12, so that the above-mentioned heat is Since the gas combustion pressure of the exchanger 7 is set to be lower than the gas combustion pressure of the gas consumption equipment, when the generated gas pressure in the digestion tank 8 decreases, the gas supply to the consumption equipment 12 is interrupted. However, since the gas supply to the heat exchanger 7 is ensured, there is no possibility that the liquid temperature in the digestion tank 8 will suddenly drop and the generated gas pressure will further decrease. Since the gas pressure can be returned to its normal value in a short time and the gas supply to the consumer equipment 12 can be restarted quickly, the generated gas can be supplied even without a gas holder. The amount of seed equipment installed can be greatly reduced compared to the conventional example.

[Brief explanation of the drawing]

The accompanying drawing is a partially sectional side view of the methane fermentation apparatus according to the present invention. 7... Heat exchanger, 8... Digestion tank, 11, 13...
...Piping, 12...Gas consumption equipment.

Claims (1)

[Scope of utility model registration request] The gas generated in the digester is connected to the heat exchanger for heating raw water and the gas consuming equipment via piping so that they can be distributed directly to the heat exchanger for heating raw water and the gas consuming equipment, respectively, and the gas combustion pressure of the heat exchanger is transferred to the gas consuming equipment. A methane fermentation device that is set below the gas combustion pressure of the equipment.