JPS61103598A - Methane fermentation apparatus - Google Patents

Abstract

PURPOSE:To heat rationally a digesting liq. in a methane fermentation vessel by heating water in a hot water tank with the heat of excess hot water when the temp. of the excess hot water is high, and heating directly the water in the hot water tank by operating a gas boiler when the temp. of excess hot water is low. CONSTITUTION:A digesting liq. in a fermenter 1 is heated by the hot water in a heater 2, and hot water kept at a specified temp. in a hot water tank 4 is supplied to the heater 2. Fermentation gas is burnt in a gas boiler 8 to heat the water in the hot water tank 4, excess hot water independent of the gas boiler 8 is circulated in a heat exchanger 13 equipped to the hot water tank 4 to heat the hot water in the hot water tank 4, and a sensor 10 for detecting the amt. of stored gas is furnished to a gas tank 9. Namely, the proportion of the fermentation gas necessary for self-warming can be reduced by heating the hot water in the hot water tank to a specified temp. with excess hot water though the heat exchanger when the excess hot water is available in the vicinity of the setting site of the apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a methane fermentation apparatus for treating organic waste.

Conventional structure and its problems Methods for maintaining the temperature of the digestive fluid in the methane fermentation tank of a methane fermentation device at a predetermined value include methods of directly blowing high-temperature steam into the digestive fluid to warm it, and One possible method is to circulate high-temperature water through a heat exchanger, but if the microorganisms in the digestive fluid are exposed to high temperatures, they may be killed by K, which would have a considerable effect on methane fermentation. give.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems and rationally heats the digestive fluid in a methane fermentation plant.

Structure of the Invention The methane fermentation apparatus of the present invention includes a methane fermentation tank, a heater for heating the digestive fluid in the fermentation premises with hot water, and supplying hot water maintained at a constant temperature to the heater B. A hot water tank, a gas boiler that heats the water in the hot water tank by burning fermentation gas, and a separate gas boiler located in the hot water tank that circulates surplus hot water to heat the water in the hot water tank. This system consists of a heat exchanger and a gas tank equipped with a sensor that detects the amount of stored gas.When the temperature of the excess hot water is high, the gas boiler circulates the excess hot water to be used within the heat exchanger and drains the hot water tank. Warm the water. When the temperature of the surplus hot water is low, the gas boiler is driven to directly heat the water in the hot water tank. The hot water in the hot water tank, which is kept at a constant temperature, is sent by a heating pump into a warmer installed around the fermenter to maintain the temperature of the digestive fluid at a predetermined value.

Description of examples Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 is a methane fermentation tank; 2 is a heater provided on the outer periphery of the methane fermentation tank 1 and maintains the temperature of the digestive fluid in the methane fermentation tank 1 by circulating hot water; and 3 in the methane fermentation tank 1; 5 is a liquid temperature sensor that detects the temperature of the digestive fluid, a hot water tank with a heat-retaining structure that collects hot water to be supplied to the 4-place warmer 2, and 5 is a hot water pump that supplies hot water in the hot water tank 4 to the warmer 2. , 6 is a hot water sensor that detects the temperature of hot water in the hot water tank 4, 7
9 is a gas boiler that burns fermentation gas to heat the water in the hot water tank 4; Water-sealed gas tank for storing fermentation gas, 1
0 is a gas amount sensor that detects the position of the floating lid of the gas tank 9; 11 is a surplus hot water tank that stores surplus hot water; 12
1 is a heating pump that supplies hot water in the surplus hot water tank 11 to the heat exchanger 13 installed in the hot water tank 4; 14 is a heating sensor installed on the pipe wall of the heat exchanger 13; 16 is a heating sensor installed in the gas boiler 8 A hot water heater separate from the provided hot water tank 4 for heating, and 16 a solenoid valve that controls the supply of hot water from the hot water heater S to the hot water storage tank 17 for storing hot water for which the user uses energy as hot water. It is.

The specific operation of the above embodiment will be explained below.

The hot water in the hot water tank 4 with a heat-retaining structure is kept at a predetermined temperature (for example, 3
8°C) or lower and the heating sensor 4 detects 40°C or higher, the heating pumps 12 to 12 are activated to supply surplus hot water to the heat exchanger 13 in the hot water tank 4. The hot water in the hot water tank 4 is heated to 38°C. When the hot water sensor 6 detects that the hot water in the hot water tank 4 has reached 38°C, the heating pump 12 is stopped, and heating of the hot water tank 4 from the surplus hot water is stopped.

Next, when the heating sensor 14 detects that the hot water in the hot water tank 4 is 38°C or lower and the temperature of the surplus hot water is 40°C or lower, the gas amount sensor 10 of the gas tank 9 detects that the amount of stored gas is at least a predetermined amount. When a certain thing is detected, the gas boiler 8 is driven, burns the fermentation gas, and directly heats the hot water in the hot water tank 4. At this time, the hot water heater 1s in the gas boiler 4 is also heated, but since the solenoid valve 16 is closed, hot water is not supplied to the hot water tank.

As mentioned above, surplus hot water or gas boiler 8
The hot water kept at a constant temperature (38°C) is supplied to the warmer 2 by the hot water pump 5, and the temperature of the digestive fluid in the fermenter 1 is maintained at the optimum temperature of 35°C. The liquid temperature sensor 3 constantly detects the temperature of the digestive liquid, and when the liquid temperature reaches 38°C due to some kind of malfunction, the hot water pump 5 stops working, stops heating the digestive liquid, and detects abnormal digestive liquid. prevent temperature rise.

When the gas amount sensor 1o of the gas tank 9 detects a predetermined amount or more, and the hot water sensor 6 detects that the temperature of the hot water in the hot water tank 4 is 38°C or more, the solenoid valve is activated at the same time as the gas boiler 8 is driven. 16 is opened and the hot water heater 15
The heated water is supplied to the hot water storage tank 17 via the solenoid valve 16 by the pressure of tap water, and is stored therein. The hot water stored in the hot water storage tank 17 is used for the bath.

Effects of the Invention The present invention, when there is surplus hot water near the equipment installation location, uses the surplus hot water to heat the hot water in the hot water tank to a constant temperature through a heat exchanger, thereby reducing the ratio required for self-warming of fermentation gas. can be reduced, increasing the percentage of Coser that can be used. In addition, the temperature of the hot water to the heater is close to the predetermined temperature of the digestive fluid, and is at a temperature that does not damage microorganisms, so heating does not have any negative effect on fermentation and contributes to good methane fermentation. .

[Brief explanation of the drawing]

The figure shows a partial sectional view of an embodiment of the present invention. 1. Methane fermentation tank, 2. Warmer, 4. Hot water tank, 8.
- Gas boiler, 1o... gas amount sensor, 13... heat exchanger.

Claims (1)

[Claims] A methane fermenter, a heater for heating the digestive fluid in the fermenter with hot water, a hot water tank for supplying hot water maintained at a predetermined temperature to the heater, and a methane fermenter for combusting fermentation gas. a gas boiler that heats water in the hot water tank; a heat exchanger that is attached to the hot water tank and that circulates surplus hot water separate from the gas boiler to heat the hot water in the hot water tank; and detects the amount of stored gas. A methane fermentation device equipped with a gas tank equipped with a sensor.