JPH01145390A - Temperature-controlling method for high-speed fermentation of organic material - Google Patents

Abstract

PURPOSE: To make it possible to maintain materials to be treated at optimum temp. for fermentation and to shorten the time for treatment, by heating materials to be treated inside a fermentation tank from the outside surface of the tank wall via the tank wall, and controlling the temp. of the inside surface of the tank wall.

CONSTITUTION: The materials 3 to be treated inside the tank 1 are indirectly heated by means of a heating device 2 of a uniform heating system such as a plane-shaped heater or a hot water jacket heater provided on the outside surface of the wall of the fermentation tank 1 via the tank wall. Then, the temperatures of the materials 3 to be treated and the inside wall surface are detected with a temp. detector 4 and a temp. detector 5 provided on the inside surface side of the tank wall respectively, and are transferred to temp. setting instruments 6, 7. These setting instruments have the upper and lower limit temp. set values respectively. The operation of the heating device 2 is stopped at the upper limit temp. set value T₁ of the setting instrument 7 and the operation as mentioned above is performed at the lower limit temp. set value T₂ of the setting instrument 7 until the temp. of the materials 3 to be treated reaches the upper limit temp. set value t₁ of the setting instrument 6. Then, when the temp. of the materials 3 to be treated rises to or above the set value t₁, the operation of the heating device 2 is stopped irrespective of any signals from the setting instrument 7 until this temp. reaches the lower limit temp. set value t₂ of the setting instrument 6.

COPYRIGHT: (C)1989,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a temperature control method of a heating device for high-speed fermentation of organic substances.

[Conventional technology]

Conventionally, in organic fermentation methods, temperature control to shorten processing time involves blowing hot air into the fermenter using a blower, hot air heater, etc., and controlling the temperature by changing the amount of hot air. There is a method of promoting fermentation by exchanging heat with exhaust gas warmed by fermentation heat and preheating supply gas.

[Problem that the invention seeks to solve]

However, the above-mentioned method has the following drawbacks.

In other words, when heating by sending hot air directly into the tank,
The amount of air for heating is required to be ten times more than the amount of air required for microorganisms and the amount of air required for water evaporation, and a huge amount of equipment and operating costs are required to deodorize the exhaust gas. In addition, in the hot air blowing method, in order to increase the heat transfer effect, it is necessary to install a blower outlet below the tank or on the stirring blade to blow out hot air, but in order to control the temperature, it is necessary to change the amount of hot air. As a result, the problem of clogging of the air outlet cannot be avoided, making stable operation for a long period of time impossible.

In addition, in the method of preheating the supply gas by exchanging heat with the exhaust gas,
It takes a long time to reach the optimum temperature for fermentation, and the desired effect cannot be obtained.

[Means for solving problems]

The gist of the present invention is to provide a heating device on the outer surface of the fermenter tank wall,
In an indirect heating fermenter that heats through the tank wall,
By detecting the inner temperature of the tank wall, heating is stopped at the upper limit set temperature (T+) of the inner temperature of the tank wall, and heating operation is performed at the lower limit set temperature (T2), various organic substances are brought to the optimum temperature for fermentation. This is a temperature control method for high-speed fermentation of organic matter, which is characterized by maintaining the temperature. The temperature of the material to be processed in the tank is detected, and when the temperature of the material to be processed in the tank rises above the upper limit temperature (t1) of the temperature of the material to be processed in the tank, heating is forcibly stopped or the temperature of the material to be processed in the tank is lowered. When the temperature of the processed material in the tank rises above the upper limit set temperature (1+) of the temperature of the processed material in the tank, the heating is forcibly stopped until the temperature of the processed material in the tank falls below the lower limit set temperature (t2). That's good. Further, the upper limit set temperature (T1) of the inner surface temperature of the tank wall is set to 100°C or lower, the lower limit set temperature (T2) is set to 40°C or higher, and the upper limit set value (t1) of the temperature of the material to be treated in the tank is set to 90°C. The lower limit setting value (h) of the temperature of the material to be treated in the tank shall be 4.
It is preferable that the temperature is 0°C or higher.

[For production]

Since the heating method is indirect heating from the outside of the tank wall through the tank wall instead of blowing hot air into the tank, no air is required for heating, and the amount of exhaust gas from the tank is necessary for microorganisms. The required minimum air volume can be set to the larger of the amount of air needed to discharge evaporated water or the amount of air required to discharge evaporated moisture, and the measures taken to deodorize the exhaust gas can be significantly reduced.

Furthermore, temperature control is a simple method in which the heating device is activated and stopped depending on the inner surface temperature of the tank wall and the temperature of the processed material.

In addition, in the fermenter where organic matter is added, if a heating device is used that has the ability to raise the temperature of the organic matter immediately after input to the optimum fermentation temperature in several hours, the temperature will reach the optimum fermentation temperature after the temperature rises. By controlling the temperature of the processed material to ~90'C, it is possible to perform high-speed fermentation in a short period of time.

〔Example〕

Hereinafter, the method of the present invention will be explained based on an embodiment shown in the drawings.

FIG. 1 is a block diagram of an example of a device used to implement the present invention. The temperature detector 4 detects the temperature of the processed material 3 put into the fermenter 1 and sends it to the temperature setting device 6. Further, the temperature detector 5 is attached to the inner surface of the tank wall heated by the uniform heating type heating device 2 such as a planar heater or hot water jacket heater provided on the outer surface of the tank wall of the fermenter 1. The temperature of the inner surface is detected and sent to the temperature setting device 7. The temperature setters 6 and 7 each have an upper limit temperature set value and a lower limit temperature set value, and control a heating device operating device 8 that stops the operation of the heating device W2.

The control method is to stop the operation of the heating device 2 at the upper limit temperature setting value TI of the temperature setting device 7 until the temperature of the processed material in the tank reaches the upper limit temperature setting value t1 of the temperature setting device 6, and The heating device 2 is operated at the lower limit temperature set value T2. When the temperature of the processed material in the tank rises to the upper limit temperature setting value 11 of the temperature setting device 6 or higher, the signal from the temperature setting device 7 continues until the temperature of the processed material in the tank reaches the lower limit temperature setting value t2 of the temperature setting device 6. The operation of the heating device 2 is stopped regardless of the situation.

Here, the upper and lower limit temperature set values of each temperature setter 6.7 should be values that maintain the organic matter at the optimum temperature for fermentation, and the temperature of the processed material, that is, the lower limit set value t of the temperature setter 6, The lower limit setting value t2 is 40"C or more where fermentation bacteria are most active, and the upper limit setting value T1 of the temperature setting device 7 is 100"C or less.
It is desirable that the lower limit setting value T2 is 40° C. or higher.

Furthermore, it is of course possible to omit the temperature detector 4 and temperature setting device 6 related to the temperature of the processed material shown in this embodiment.

[Effects of the Invention] As is clear from the above explanation, the temperature control method of the present invention can control the temperature of the material to be processed in the tank even immediately after inputting the tank by controlling the temperature of the inner wall surface of the tank according to the temperature of the material to be processed in the tank. Since the temperature can be maintained at the optimum temperature for fermentation at all times, it can be turned into compost or feed in a short period of about one day.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a device for implementing the present invention. 1... Fermentation tank, 2... Heating device, 3... Processed material,
4゜5...Temperature detector, 6.7...Temperature setting device, 8
...Heating device operation controller. Agent: Patent attorney Masamitsu Akizawa and 1 other person

Claims (6)

[Claims] (1) In a fermenter using an indirect heating method in which a heating device is installed on the outer surface of the tank wall and heats through the tank wall, the inner temperature of the tank wall is detected and the upper limit set temperature (T_1
) A temperature control method for high-speed fermentation of organic substances, characterized in that various organic substances are maintained at the optimum temperature for fermentation by controlling heating operation to be stopped at a lower limit set temperature (T_2). (2) The temperature of the material to be processed in the tank is detected, and heating is forcibly stopped after the temperature of the material to be processed in the tank rises above the upper limit temperature (t_1) of the temperature of the material to be processed in the tank.Claim 1 A temperature control method for high-speed fermentation of organic matter as described in . (3) The temperature of the processed material in the tank is detected, and after the temperature of the processed material in the tank rises above the upper limit set temperature (t_1) of the temperature of the processed material in the tank, the temperature of the processed material in the tank is lower than the lower limit set temperature (t_2). 2. A temperature control method for high-speed fermentation of an organic substance according to claim 1, wherein heating is forcibly stopped until the temperature reaches 100. (4) According to claim 1, 2, or 3, the upper limit set temperature (T_1) of the inner surface temperature of the tank wall is 100°C or lower, and the lower limit set temperature (T_2) is 40°C or higher. A temperature control method for high-speed fermentation of the described organic matter. (5) Set the upper limit setting value (t_1) of the temperature of the material to be treated in the tank to 9
A temperature control method for high-speed fermentation of an organic substance according to claim 2 or 3, wherein the temperature is 0° C. or lower. (6) Set the lower limit set value (t_2) of the temperature of the material to be processed in the tank to 4
A temperature control method for high-speed fermentation of an organic substance according to claim 3, wherein the temperature is set to 0°C or higher.