JP2002176967A - Method and apparatus for observing fermentation state in methane fermentation tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To instantaneously judge the state of fermentation in a methane fermentation tank and enable to respond in an early stage to the occurrence of an abnormal fermentation. SOLUTION: A generated gas-collecting device 18 for continuously measuring pressures is installed to be located in a liquid in the fermentation tank 10. It has a gas chamber 30 capable of collecting the generated gas and installed with a gas-collecting plate 32 having a shape like a solder's camp hat in the lower part of the gas chamber 30 and a baffle plate 34 is installed under the plate 32. An aerobic siphon pipe 36 is installed in the gas chamber 30, the one end of which is open in the upper part of the gas chamber 30 and the other end of which is communicated with an aerobic pipe 38 on the upper face of the gas chamber 30. A pressure gauge 40 is installed in the gas chamber 30 and the pressure in the gas chamber 30 is continuously measured. The state of fermentation is judged by analyzing a time-dependent change of continuously measured gas pressures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a process for measuring the change in the amount of generated gas in methane fermentation every time, by capturing a part of the generated gas, ejecting the gas at a certain amount, and re-pressing the generated gas in the gas chamber. Equipment that enables continuous measurement of
By installing one or more fermentation tanks in the methane fermentation tank where necessary to diagnose the fermentation situation, it is possible to know the pressure change pattern there, and furthermore, by analyzing the fermentation situation, methane fermentation can be diagnosed and continuously monitored The present invention relates to a fermentation status monitoring method and apparatus in a tank.

[0002]

2. Description of the Related Art In order to continuously know the internal state of a fermenter in which methane fermentation is being performed, samples are continuously or semi-continuously extracted using various analytical sensors, and changes in the concentration of components in the sample are performed. It is a common technique to measure the fermentation conditions and analyze the fermentation status based on the results. Also,
It is common practice to continuously measure the amount of gas generated and to estimate the overall fermentation status in the tank based on the change in the amount of gas generated.

As a method for directly measuring the methane production activity of methane fermentation, Japanese Patent Application Laid-Open No. Hei 10-227781 discloses a method in which a sample to be analyzed is placed in a pressure vessel for measuring the methane production activity and a predetermined temperature control is performed. A method and an apparatus are described in which methane fermentation of a sample is continued while adding water or stirring, the pressure in the pressure vessel is continuously measured by a pressure sensor, and the methane production activity is measured from the pressure change.

[0004]

All of the above methods are analysis evaluations after taking a sample. Even if the analysis time is shortened, there is a time lag between the time of sampling and the time when an analysis result is obtained. When there is an abnormality in fermentation, there is a considerable time difference between the fact and the fact that a measure is taken. Further, in the case of the diagnosis by the continuous measurement of the generated gas which is usually performed, the gas to be measured is a mixture of the generated gas in the entire tank, and only the average methane generation activity in the entire tank can be diagnosed. Therefore, with these methods, it is hardly possible to measure a change in the situation or a change in a short time due to a difference in the location in the tank, and it is not possible to respond sensitively to the change in the situation. At that time, it was often impossible to take effective measures.

The present invention has been made in view of the above points, and an object of the present invention is to provide a fermented gas collector having a very simple structure and capable of automatically repeating gas collection and ejection. Immediately know the fermentation situation in the required location in the fermentation tank by installing one or more in the required location in the tank and continuously measuring the pressure change in the gas chamber in the gas collector This makes it possible to diagnose the fermentation status of the methane fermentation tank comprehensively and instantaneously, and to be able to respond early even when an abnormality occurs. It is to provide a device.

[0006]

In order to achieve the above object, a method for monitoring a fermentation state in a methane fermentation tank according to the present invention comprises:
The gas generated in the methane fermentation tank was collected in a gas chamber connected to the lower part provided with a bottom provided vertically or substantially vertically in the fermentation tank and connected to the lower part, and filled with a predetermined amount. After that, the generated gas in the gas chamber is blown out from the upper gas outlet, and the gap between the gas recovery member formed on the lower side of the gas chamber and the baffle plate or the bottom of the fermentation tank, and the upper pipe of the gas chamber. A method for monitoring a fermentation state in a methane fermentation tank using an evolved gas collector that sucks up liquid from at least one of a liquid suction pipe having an upper end connected and a lower end positioned below a gas recovery member, comprising: It is configured to continuously measure the gas pressure and measure the change with time to diagnose the fermentation situation in the tank (FIGS. 1 to 5, 8,
(See FIG. 9).

Further, according to the method of the present invention, a gas generated in a methane fermentation tank is provided with a gas having a bottom provided vertically or substantially vertically in the fermentation tank and a gas recovery member connected to a lower part. After the gas is collected in the chamber and filled with a predetermined amount, the generated gas in the gas chamber is blown out from the upper gas outlet, and a gas recovery member formed on the lower side of the gas chamber and a baffle plate or a bottom of the fermentation tank. Inside the methane fermentation tank using a generated gas collector that sucks liquid from at least one of the liquid suction pipes whose upper end is connected to the upper pipe of the gas chamber and whose lower end is located below the gas recovery member. The method for monitoring the fermentation state of the above, wherein a plurality of evolved gas collectors are installed in the fermentation tank, the gas pressure in each gas chamber is continuously measured, and the change over time is measured, whereby the fermentation state in the tank is measured. Characterized by diagnosing See FIGS. 8 and 9).

In the above method of the present invention, a pipe having a portion below the positions of both ends is provided in the gas chamber, one end of the pipe is opened in the gas chamber, and the other end is a gas outlet at the upper part of the gas chamber. (See FIG. 3 etc.).

[0009] In the method of the present invention, the gas generated in the methane fermentation tank is opened in the fermentation tank in a vertical or substantially vertical direction, and a gas ejection passage is formed through a side member. After being collected in the gas chamber and filled with a predetermined amount, the generated gas in the gas chamber is blown out from the gas jet through the gas jet passage, and the lower end formed outside the gas jet passage is closed. A fermentation status monitoring method in a methane fermentation tank using an evolved gas collector that sucks up liquid from a liquid suction passage connected to a pipe that is open and has an upper end communicating with a gas outlet. It is characterized in that the fermentation state in the tank is diagnosed by measuring and measuring the change with time (see FIGS. 6 and 7).

[0010] In the method of the present invention, the gas generated in the methane fermentation tank is opened in the fermentation tank in a vertical or substantially vertical direction, and a gas ejection passage is formed through a side member. After being collected in the gas chamber and filled with a predetermined amount, the generated gas in the gas chamber is blown out from the gas jet through the gas jet passage, and the lower end formed outside the gas jet passage is closed. A fermentation status monitoring method in a methane fermentation tank that uses a generated gas collector that sucks liquid from a liquid suction passage connected to a pipe that opens and has an upper end communicating with a gas outlet. The method is characterized in that a plurality of tanks are installed in the tank, the gas pressure in each gas chamber is continuously measured, and the change over time is measured to diagnose the fermentation state in the tank.

In the method of the present invention, the time-dependent change in the rate of rise of the gas pressure in the gas chamber and the interval time from the occurrence of gas ejection in the gas chamber to the occurrence of the next gas ejection are measured. By doing so, it is possible to diagnose a difference in location and / or a difference in time in the state of fermentation in the fermenter. In these methods of the present invention, it is also possible to diagnose the fermentation status by sampling and analyzing at least a part of the gas spouted from the gas spout of the gas chamber.

The apparatus for monitoring fermentation status in a methane fermentation tank according to the present invention comprises: a gas chamber having a bottom opening and provided in a vertical or substantially vertical direction so as to be located in a liquid in the methane fermentation tank;
A gas-collecting umbrella member connected to the lower part of the gas chamber, and a baffle plate installed substantially horizontally below the umbrella member so as to form a gap between the umbrella member and the umbrella member; A fermentation status monitoring device in a methane fermentation tank using a generated gas collector including a gas ejection port provided in an upper member of a gas chamber, wherein a pressure measuring means is provided in the gas chamber. It is characterized in that the fermentation condition in the fermenter is diagnosed from the time-dependent change of the gas pressure measured continuously by the data conversion means and the data analysis means connected to the pressure measurement means (see FIGS. 1 to 4). ).

The apparatus of the present invention is connected to a lower part of the gas chamber, which is provided in the liquid in the methane fermentation tank in a vertical or substantially vertical direction and has an open bottom. A gas-covered umbrella member, a baffle plate installed substantially horizontally below the umbrella member so as to form a gap between the umbrella member, and an upper surface member of the gas chamber. A fermentation status monitoring device in a methane fermentation tank using a generated gas collector including a gas ejection port, wherein a plurality of generated gas collectors are installed in the fermentation tank, and each gas A pressure measuring means is provided in the room, and the data conversion means and the data analyzing means connected to these pressure measuring means diagnose the fermentation state in the fermenter from the time-dependent change of the continuously measured gas pressure. (See FIGS. 8 and 9) .

In the above-described apparatus of the present invention, a pipe having a portion below the positions of both ends is provided in the gas chamber, and one end of the pipe is opened in the gas chamber, and the other end is provided in the upper part of the gas chamber. It is preferable to adopt a configuration communicating with the gas ejection port (see FIG. 3 and the like). Further, in these devices of the present invention, the upper end of the generated gas collector is connected to a pipe communicating with the gas ejection port on the upper side of the gas chamber. In some cases, one or a plurality of liquid suction pipes whose lower ends are located may be provided (see FIG. 5). Also,
Instead of providing a pipe having portions below the positions of both ends in the gas chamber, it is also possible to adopt a configuration in which an on-off valve is provided in a pipe that communicates with a gas ejection port of the gas chamber (see FIG. 4).

Further, the apparatus of the present invention comprises a gas chamber provided in a vertical or substantially vertical direction so as to be located in a liquid in a methane fermentation tank and having an open bottom, and a side member connected to the gas chamber via a side member. A gas ejection passage having one end opened into the gas chamber and the other end opened as a gas ejection port outside the gas chamber, and a lower end formed outside the gas ejection passage is open and an upper end is formed in the gas ejection port. A fermentation status monitoring device in a methane fermentation tank using a generated gas collector including a liquid suction passage connected to a communicating pipe, wherein a pressure measuring means is provided in a gas chamber, and the pressure measurement is performed. The method is characterized in that the fermentation condition in the fermenter is diagnosed from the time-dependent change of the gas pressure measured continuously by the data conversion means and the data analysis means connected to the means (see FIGS. 6 and 7).

Further, the apparatus of the present invention comprises a gas chamber having a bottom opening and provided in a vertical or substantially vertical direction so as to be located in the liquid in the methane fermentation tank. A gas ejection passage having one end opened into the gas chamber and the other end opened as a gas ejection port outside the gas chamber, and a lower end formed outside the gas ejection passage is open and an upper end is formed in the gas ejection port. A fermentation state monitoring device in a methane fermentation tank using a generated gas collector including a liquid suction passage connected to a communicating pipe, wherein a plurality of generated gas collectors are installed in the fermentation tank. The pressure measurement means is provided in each gas chamber, and the data conversion means and the data analysis means connected to these pressure measurement means determine the fermentation condition in the fermenter from the time-dependent change of the gas pressure continuously measured. Diagnostics It is characterized in.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments and can be implemented with appropriate modifications. . 1 and 2 show a schematic configuration of an apparatus for implementing a method for monitoring a fermentation situation in a methane fermentation tank according to a first embodiment of the present invention, and FIG. 1 shows an entire configuration of the fermentation apparatus. In the present embodiment, one generated gas collector for continuous pressure measurement is set in a fermentation tank. As shown in FIG.
And a generated gas outlet 14, and the liquid outlet 1 is provided on the upper side.
6 are provided. An evolved gas collector 18 for continuous pressure measurement is provided in the liquid in the fermenter 10 in a vertical direction or a substantially vertical direction. The detailed configuration of the generated gas collector 18 and the detailed description of the monitoring and diagnosis of the fermentation status by continuous measurement of the gas pressure will be described later. 20
Is a data converter, 22 is a computer, and 24 is a recorder.
In the fermenter 10, an object to be treated (for example, moist organic waste such as livestock manure, food waste liquid, and sludge) supplied from the object to be treated inlet 12 is digested (fermented) under anaerobic conditions, and fermentation is performed. As it proceeds, gas such as methane is generated. The generated gas is taken out from the generated gas outlet 14 and once stored in the gas tank 26, and then is effectively used for various uses. After the liquid after the fermentation treatment is extracted from the liquid outlet 16, the sedimentation tank 28
Sludge is settled and separated, and the supernatant is discharged as treated water.

Next, the fermentation status monitoring method and apparatus of the present embodiment will be described in detail with reference to FIG. FIG. 3 is an enlarged view of the generated gas collector for continuous pressure measurement shown in FIG.
It is. As shown in FIGS. 2 and 3, the generated gas collector 18 for continuous pressure measurement is installed in a vertical direction or a substantially vertical direction so as to be located in the liquid in the fermenter 10. And a gas chamber 30 capable of collecting generated gas. A gas-collecting umbrella-shaped plate 32 is attached to the lower part of the gas chamber 30 in a bulk shape, and a baffle plate 34 is installed horizontally or substantially horizontally below the gas-collecting umbrella-shaped plate 32. Note that a configuration in which the baffle plate 34 is not provided is also possible. An aeration siphon pipe 36 is provided in the gas chamber 30, and one end of the siphon pipe 36 is opened at an upper part in the gas chamber 30, and the other end is connected to an aeration pipe 38 connected to the upper surface of the gas chamber 30. Communicating. Aeration siphon tube 3
As the shape of 6, for example, a substantially U-shaped tube shape, a substantially V-shaped tube shape, or the like is used, but the shape is not limited to these shapes. If it's a tube, it's fine. The gas chamber 30
A pressure gauge (pressure sensor) 40 is provided above the gas chamber so that the internal pressure can be continuously measured. Reference numeral 42 denotes a support member.

The generated gas collector 18 installed in the fermenter 10 has a configuration in which the pressure of the gas chamber 30 can be measured and the gas collection and ejection can be automatically repeated (automatic restoration is possible). is there. In other words, the liquid in the fermenter is used as a gas recovery hood 3
The gas passes through the gap between the baffle plate 2 and the baffle plate 34, and the gas generated here is collected by the gas collecting hood 32 and collected in the gas chamber 30. In the gas chamber 30, when the gas is collected to the lowermost part of the aeration siphon tube 36, the siphon tube 3
Gas is blown out from 6 and the liquid in the fermentation tank newly enters between the gas collecting hood 32 and the baffle 34, and the gas generation and collection start again. During this time, the pressure in the gas chamber 30 is
Is measured continuously. The pressure signal from the generated gas collector 18 for continuous pressure measurement is converted into an electric signal by the data converter 20, and is analyzed by the computer 22. The result is recorded in recorder 24.

When the generated gas collector for continuous pressure measurement shown in FIGS. 2 and 3 is used, gas collection and ejection are automatically repeated, and convection of the liquid in the fermentation tank is automatically generated. Agitation in the fermenter can also be performed without power. However, in the present embodiment, besides the generated gas collector for continuous pressure measurement shown in FIG. 3, for example, a generated gas collector for continuous pressure measurement as shown in FIG. 4 can also be used. That is, the generated gas collector for continuous pressure measurement shown in FIG. 4 can be applied to the configuration of FIG.

The generated gas collector 18a shown in FIG. 4 has a gas chamber 30 which is open at the bottom and capable of collecting generated gas, and a gas collecting fin plate 32 is attached to the lower part of the gas chamber 30. A baffle plate 34 is provided below the gas-collecting skirt plate 32. Note that a configuration in which the baffle plate 34 is not provided is also possible. A gas outlet 44 is provided on the upper surface of the gas chamber 30.
Is provided, and an on-off valve 48 is provided in a gas pipe 46 communicating with the gas ejection port 44. The opening / closing valve 48 may be an automatic control valve, or may have a simple configuration of simply opening and closing. Further, a pressure gauge (pressure sensor) 40 is provided above the gas chamber 30 so that the pressure in the gas chamber 30 can be continuously measured. The generated and collected gas collects in the gas chamber 30, and for example, when the gas is collected to a predetermined amount, the on-off valve 48 is opened to eject the gas. At this time, the liquid in the fermentation tank newly enters between the gas collecting hood 32 and the baffle plate 34, and gas generation and collection start again. During that time, the pressure in the gas chamber 30 is continuously measured by the pressure gauge 40.

Further, in this embodiment, in addition to the generated gas collector for continuous pressure measurement shown in FIG. 3, for example, a generated gas collector for continuous pressure measurement as shown in FIG. 5 may be used. it can. That is, the generated gas collector for continuous pressure measurement shown in FIG. 5 can be applied to the configuration of FIG. The generated gas collector 18b shown in FIG. 5 has a gas chamber 30 having an open bottom and capable of collecting generated gas.
A gas collecting slab 50 is attached to the lower part of the fin. In addition, it is also possible to install a baffle plate under the gas-collecting cap-shaped plate 50. An aeration siphon pipe 36 is provided in the gas chamber 30, and one end of the siphon pipe 36 is opened at an upper part in the gas chamber 30, and the other end is connected to an aeration pipe 38 connected to the upper surface of the gas chamber 30. Communicating. The generated gas collector 18b has an upper end connected to the aeration pipe 38 and penetrates through the gas recovery hood 50 to form a hood 50.
A liquid suction tube 52 whose lower end is located below the lower side is provided.
In the generated gas collector 18b shown in FIG. 5, when the gas is blown out from the aeration siphon pipe 36, the liquid is sucked up by the liquid suction pipe 52, so that the stirring effect in the fermenter is large. Other configurations and operations are the same as those in FIG.

Further, in the present embodiment, in addition to the generated gas collector for continuous pressure measurement shown in FIG.
An evolved gas collector for continuous pressure measurement as shown in FIGS. 6 and 7 can also be used. That is, the generated gas collector for continuous pressure measurement shown in FIGS. 6 and 7 can be applied to the configuration of FIG. Generated gas collector 18 shown in FIGS.
c is a gas chamber 58 having an open bottom and capable of collecting generated gas.
The gas chamber 58 is provided with a gas ejection passage 64 having one end opened into the gas chamber and the other end opened as a gas ejection port 62 outside the gas chamber via a side member 60. Outside the gas ejection passage 64, there is provided a liquid suction passage 66 connected to a pipe having a lower end opening and an upper end communicating with the gas ejection port 62. A pressure gauge (pressure sensor) 40 is provided above the gas chamber so that the pressure in the gas chamber 58 can be continuously measured.

The generated gas collector 18 installed in the fermenter
“c” has a configuration in which the pressure of the gas chamber 58 can be measured, and gas collection and ejection can be automatically repeated (automatic restoration is possible). That is, the generated gas is collected in the gas chamber 58,
When this gas is collected to the lowermost part of the gas ejection passage 64, the gas is ejected from the gas ejection port 62. A new liquid enters the gas chamber 58, and gas generation and collection start again. During that time, the pressure in the gas chamber 58 is continuously measured by the pressure gauge 40. In the generated gas collector 18c shown in FIGS. 6 and 7, the gas ejection port 6 passes through the gas ejection passage 64 from inside the gas chamber 58.
When the gas is blown out from 2, the liquid is sucked up in the liquid suction passage 66, so that the stirring effect in the fermenter is large. Other configurations and operations are the same as those in FIGS. 2, 3, and 5.

In the method and apparatus for monitoring the fermentation status in the methane fermentation tank described in this embodiment, the gas chamber 3
By sampling at least a part of the gas ejected from the gas chamber 0 (or the gas chamber 58) and performing component analysis, it is possible to monitor the generation state of methane gas and the generation state of other gases (hydrogen sulfide, carbon dioxide, etc.). It is possible. This makes it possible to more comprehensively diagnose the fermentation status of the methane fermentation tank.

FIGS. 8 and 9 show a schematic configuration of an apparatus for performing a fermentation status monitoring method in a methane fermentation tank according to a second embodiment of the present invention. In the present embodiment, a plurality of generated gas collectors for continuous pressure measurement are set in a fermenter. As shown in FIG. 8, for example, three generated gas collectors 18 for continuous pressure measurement are installed in the fermenter 10 at different locations. In this case, the three types of pressure signals are also analyzed by the computer 22 via the data converter 20 to analyze the fermentation status of each place, and comprehensively diagnose the status of the entire tank. Other configurations and operations are the same as those in the first embodiment.

FIG. 9 shows another example in which a plurality of evolved gas collectors for continuous pressure measurement are set, in which a fermenter for forming an extrusion flow in a horizontally long shape is used. As shown in FIG. 9, the fermenter 10 a has a treatment object inlet 12 at one end and a generated gas outlet 14 and a liquid outlet 1 at the other end.
6 is provided, and the liquid in the tank moves from the workpiece inlet 12 side to the liquid outlet 16 side in an extruding flow. 54 is a stirring means, and 56 is a drive source (motor). In FIG.
As an example, four generated gas collectors 18 are provided, and in this case, four types of pressure signals are similarly output from the data converter 2.
After 0, analysis is performed by the computer 22, the fermentation status over time at each location is analyzed, and the status of the entire tank is comprehensively diagnosed. Other configurations and operations are the same as those in the first embodiment.

[0028]

Next, an embodiment of the present invention will be described. Example 1 An evolved gas collector for continuous pressure measurement as shown in FIG. 3 was introduced into a fermenter as an evolved gas measuring device, and the result of continuously measuring the pressure in the gas chamber was shown in FIG. The change with time in the pressure in the gas chamber gradually increased, and a sudden decrease in pressure occurred at the moment when the gas in the gas chamber was ejected. The generated gas collector for continuous pressure measurement has a feature that gas collection and ejection are automatically repeated, and the pattern of the pressure change repeats the above temporal change. What is important in this repetition pattern is the rate of pressure rise, and since the capacity of the gas chamber is constant, the rate of rise is fast in a situation where gas generation is active, and the time until the next pressure change pattern is repeated becomes short. By constantly analyzing it, I was able to know the methane fermentation situation every moment.

Example 2 The pressure change rate was measured under various conditions, and the relationship between the pressure change rate and the actually measured gas generation amount at that time was summarized in FIG. It has been found that the gas generation state can be diagnosed with extremely high accuracy by analyzing the pressure change rate by the generated gas collector for continuous pressure measurement.

[0030]

As described above, the present invention has the following effects. (1) By setting the generated gas collector for continuous pressure measurement at the desired location in the fermenter, highly reliable pressure change data of the generated gas collection section can be obtained continuously and analyzed. By doing so, the state of methane gas generation in the fermenter can be instantaneously diagnosed without taking much time. As a result, it is possible to respond promptly even when an abnormality occurs. (2) By setting a plurality of generated gas collectors for continuous pressure measurement at various locations in the fermenter, the fermentation status of each part in the fermenter can be known at the same time. Diagnosis of abnormalities becomes possible, and comprehensive fermentation conditions and abnormalities can be diagnosed even in large fermenters. (3) The state of fermentation in the fermenter can be continuously monitored using a generated gas collector having a very simple structure.
Moreover, since the detection data is a pressure change, the reliability of the detection sensor is high.

[Brief description of the drawings]

FIG. 1 is a systematic schematic configuration elevation sectional view showing a fermentation apparatus including an apparatus for implementing a method for monitoring a fermentation situation in a methane fermentation tank according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional elevational view showing an apparatus for implementing a method for monitoring a fermentation status in a methane fermentation tank according to a first embodiment of the present invention.

FIG. 3 is an enlarged vertical sectional explanatory view showing an example of a generated gas collector for continuous pressure measurement according to the first embodiment of the present invention.

FIG. 4 is an enlarged vertical sectional explanatory view showing another example of the generated gas collector for continuous pressure measurement according to the first embodiment of the present invention.

FIG. 5 is an enlarged vertical sectional explanatory view showing another example of the generated gas collector for continuous pressure measurement according to the first embodiment of the present invention.

FIG. 6 is an enlarged vertical sectional explanatory view showing still another example of the generated gas collector for continuous pressure measurement according to the first embodiment of the present invention.

FIG. 7 is a bottom view of the generated gas collector shown in FIG.

FIG. 8 is a schematic vertical sectional view showing an example of an apparatus for performing a method for monitoring a fermentation situation in a methane fermentation tank according to a second embodiment of the present invention.

FIG. 9 is a schematic vertical sectional view showing another example of an apparatus for performing the method for monitoring a fermentation status in a methane fermentation tank according to the second embodiment of the present invention.

FIG. 10 is a graph showing pressure change measurement results in the example of the present invention.

FIG. 11 is a graph showing a relationship between a pressure change and an actually measured gas generation amount in the example of the present invention.

[Explanation of symbols]

 10, 10a Fermentation tank 12 Processing object input port 14 Generated gas outlet 16 Liquid outlet 18, 18a, 18b, 18c Generated gas collector 20 Data converter 22 Computer 24 Recorder 26 Gas tank 28 Precipitation tank 30, 58 Gas chamber 32 , 50 Gas-collecting cap plate 34 Baffle plate 36 Aeration siphon tube 38 Aeration pipe 40 Pressure gauge (pressure sensor) 42 Support member 44, 62 Gas outlet 46 Gas pipe 48 Open / close valve 52 Suction pipe 54 Stirrer 56 Drive source (motor) 60 Side member 64 Gas ejection passage 66 Liquid absorption passage

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazura Takagaki 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside Akashi Plant (72) Inventor Yasushi Isshiki 1-3-1, Higashi-Kawasaki-cho, Chuo-ku, Kobe-shi No. Kawasaki Heavy Industries, Ltd. Kobe Head Office F-term (reference) 4D040 AA23 AA61 4D059 AA01 AA03 AA07 BA17 BA48 BE31 BE49 CB19 EA08 EA20

Claims (14)

[Claims] Claims: 1. A gas generated in a methane fermentation tank is collected in a gas chamber having a bottom provided in a vertical direction or a substantially vertical direction in the fermentation tank and a gas collection member connected to a lower part,
After filling a predetermined amount, the generated gas in the gas chamber is blown out from the upper gas outlet, and the gap between the gas recovery member formed on the lower side of the gas chamber and the baffle plate or the bottom of the fermentation tank, and the gas Method for monitoring fermentation status in a methane fermentation tank using an evolved gas collector that sucks a liquid from at least one of a liquid suction pipe whose upper end is connected to a pipe on the upper side of the chamber and whose lower end is located below the gas recovery member A method for monitoring a fermentation state in a methane fermentation tank, wherein the fermentation state in the methane fermentation tank is diagnosed by continuously measuring the gas pressure in the gas chamber and measuring the change over time. 2. A gas generated in the methane fermentation tank is collected in a gas chamber in which a bottom provided vertically or substantially vertically in the fermentation tank is open and a gas collection member is connected to a lower part,
After filling a predetermined amount, the generated gas in the gas chamber is blown out from the upper gas outlet, and the gap between the gas recovery member formed on the lower side of the gas chamber and the baffle plate or the bottom of the fermentation tank, and the gas Method for monitoring fermentation status in a methane fermentation tank using an evolved gas collector that sucks a liquid from at least one of a liquid suction pipe whose upper end is connected to a pipe on the upper side of the chamber and whose lower end is located below the gas recovery member Therefore, a plurality of evolved gas collectors are installed in the fermentation tank, and the gas pressure in each gas chamber is continuously measured, and the change over time is measured to diagnose the fermentation state in the tank. Characteristic method of monitoring fermentation status in methane fermentation tank. 3. A structure is provided in which a pipe having a portion below the positions of both ends is provided in a gas chamber, one end of the pipe is opened in the gas chamber, and the other end is communicated with a gas outlet above the gas chamber. 3. The method for monitoring fermentation status in a methane fermentation tank according to claim 1 or 2. 4. The gas generated in the methane fermentation tank is recovered in a gas chamber having a vertically or substantially vertically provided bottom opening in the fermentation tank and a gas ejection passage formed through a side member. After the gas is filled with a predetermined amount, the generated gas in the gas chamber is blown out from the gas ejection port via the gas ejection passage, and the lower end formed outside the gas ejection passage is opened and the upper end is opened. This is a method for monitoring the fermentation status in a methane fermentation tank using a generated gas collector that sucks up liquid from a liquid suction passage connected to a pipe connected to an outlet, and continuously measures the gas pressure in a gas chamber and changes over time. A fermentation state monitoring method in a methane fermentation tank, wherein the fermentation state in the methane fermentation tank is diagnosed by measuring the fermentation state in the methane fermentation tank. 5. The gas generated in the methane fermentation tank is recovered in a gas chamber having a bottom provided vertically or substantially vertically in the fermentation tank and having a gas ejection passage formed through a side member. After the gas is filled with a predetermined amount, the generated gas in the gas chamber is blown out from the gas ejection port via the gas ejection passage, and the lower end formed outside the gas ejection passage is opened and the upper end is opened. This is a method for monitoring the fermentation status in a methane fermentation tank using a generated gas collector that sucks up liquid from a liquid suction passage connected to a pipe that communicates with an outlet.A plurality of generated gas collectors are installed in the fermentation tank. A method for monitoring the fermentation status in the methane fermentation tank, wherein the fermentation status in the methane fermentation tank is diagnosed by continuously measuring the gas pressure in each gas chamber and measuring the change over time. 6. A time-dependent change in a rising speed of a gas pressure in a gas chamber and an interval time from the occurrence of gas ejection in the gas chamber to the occurrence of the next gas ejection are measured.
The method for monitoring fermentation status in a methane fermentation tank according to any one of claims 1 to 5, wherein a difference in location and / or time in the fermentation status in the fermentation tank is diagnosed. 7. The fermentation status monitoring in the methane fermentation tank according to claim 1, wherein the fermentation status is diagnosed by sampling and analyzing at least a part of the gas ejected from the gas outlet of the gas chamber. Method. 8. A gas chamber which is provided in a vertical or substantially vertical direction so as to be located in a liquid in a methane fermentation tank, and has a bottom opening, and a gas recovery hood connected to a lower portion of the gas chamber. A member and a baffle plate installed substantially horizontally below the chin-shape member so as to form a gap between the chin-shape member,
A fermentation status monitoring device in a methane fermentation tank using a generated gas collector including a gas ejection port provided on an upper surface member of the gas chamber, wherein a pressure measuring unit is provided in the gas chamber, The fermentation condition in the methane fermentation tank is characterized by diagnosing the fermentation state in the fermentation tank from the time-dependent change in the gas pressure measured continuously by the data conversion means and the data analysis means connected to the pressure measurement means. Condition monitoring device. 9. A gas chamber provided in a vertical or substantially vertical direction so as to be located in a liquid in a methane fermentation tank and having an open bottom, and a gas recovery fin-shape connected to a lower portion of the gas chamber. A member and a baffle plate installed substantially horizontally below the chin-shape member so as to form a gap between the chin-shape member,
A fermentation status monitoring device in a methane fermentation tank using a generated gas collector including a gas outlet provided in an upper member of the gas chamber, wherein the generated gas collector is provided in the fermentation tank. A plurality of pressure sensors are provided, and pressure measuring means are provided in each gas chamber.The data converting means and the data analyzing means connected to these pressure measuring means detect the time-dependent change in the gas pressure continuously measured in the fermenter. A fermentation status monitoring device in a methane fermentation tank characterized in that the fermentation status of the methane fermentation tank is diagnosed. 10. A gas chamber having a tube having a portion below the position of both ends is provided in the gas chamber, one end of the tube is opened in the gas chamber, and the other end communicates with a gas outlet above the gas chamber. The fermentation status monitoring device in the methane fermentation tank according to claim 8 or 9, wherein 11. The generated gas collector has an upper end connected to a pipe communicating with a gas jet port above the gas chamber, and penetrates a gas-collecting member, and has a lower end positioned below the member. The fermentation status monitoring device in a methane fermentation tank according to claim 8, 9 or 10, wherein at least one liquid suction pipe is provided. 12. The inside of the methane fermentation tank according to claim 10, wherein an on-off valve is provided in a pipe communicating with a gas ejection port of the gas chamber, instead of providing a pipe having a portion below both ends in the gas chamber. Fermentation status monitoring device. 13. A gas chamber which is provided in a vertical or substantially vertical direction so as to be located in a liquid in a methane fermentation tank and has an open bottom, and one end provided in the gas chamber via a side member is provided with a gas. A gas ejection passage that opens into the chamber and has the other end opened as a gas ejection port outside the gas chamber, and a lower end formed outside the gas ejection passage is connected to a pipe that opens at the lower end and communicates with the gas ejection port at the upper end. A fermentation status monitoring device in a methane fermentation tank using a generated gas collector including a liquid absorption passage, wherein pressure measurement means is provided in the gas chamber, and data connected to the pressure measurement means. A fermentation state monitoring device in a methane fermentation tank characterized in that the conversion means and the data analysis means diagnose the fermentation state in the fermentation tank based on the time-dependent change in the continuously measured gas pressure. 14. A gas chamber having a bottom opening and provided in a vertical or substantially vertical direction so as to be located in a liquid in a methane fermentation tank, and one end provided through a side member in the gas chamber. A gas ejection passage that opens into the chamber and has the other end opened as a gas ejection port outside the gas chamber, and a lower end formed outside the gas ejection passage is connected to a pipe that opens at the lower end and communicates with the gas ejection port at the upper end. A fermentation status monitoring device in a methane fermentation tank using a generated gas collector comprising a liquid absorbing passage, wherein a plurality of generated gas collectors are installed in the fermentation tank, Pressure measuring means is provided in the gas chamber,
By the data conversion means and the data analysis means connected to these pressure measurement means, in the methane fermentation tank characterized in that the fermentation state in the fermentation tank was diagnosed from the temporal change of the continuously measured gas pressure. Fermentation status monitoring device.