JP2017209614A - Methane fermentation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a methane fermentation apparatus capable of preventing materials to be treated from excreting, and enhancing methane gas concentration without mechanical agitation.SOLUTION: A methane fermentation apparatus 1 is a dry methane fermentation apparatus. A methane fermentation tank 40 is divided into three or more treating rooms 40A, 40B, 40C. While a material to be treated that is loaded in the most upstream room is transferred to a next downstream room, the material to be treated is fermented to generate methane gas. The methane fermentation tank 40 has a treated material circulation unit 40E that recovers the treated material on the tank bottom and injects the treated material into the tank from an outflow port arranged at an upper edge part of a solid formed by the treated material in the tank. The outflow port faces the center of the solid.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a methane fermentation apparatus.

  2. Description of the Related Art Conventionally, a methane gas fermentation apparatus that performs methane fermentation treatment on a treated product in which organic waste is solubilized to generate methane gas has been used (see, for example, Patent Document 1).

JP 2015-21732 A

  In the methane fermentation apparatus, when there is only one methane fermentation tank, there is a possibility that unprocessed material that has not been subjected to methane fermentation treatment may be discharged.

  Moreover, in the methane fermentation tank, in order to increase the concentration of methane gas, it was necessary to stir the treated product. However, conventionally, it is common to stir the processed material with a stirring rod. Therefore, equipment such as a stirring bar is required in the tank, and equipment maintenance is also required.

  The present invention has been made in view of the above circumstances, and provides a methane fermentation apparatus capable of preventing the discharge of untreated materials and increasing the concentration of methane gas without requiring mechanical stirring. The purpose is to do.

In order to achieve the above object, a methane fermentation apparatus according to the first aspect of the present invention comprises:
A dry methane fermentation device,
A methane fermentation tank that ferments the processed material to generate methane gas while the processed material that is divided into three or more processing tanks and is put into the uppermost tank is sequentially sent to the lower processing tank,
The methane fermenter is
The processing object which collects the processing thing in the bottom face in a tank, and is equipped with the processing thing circulation part which blows off the processing substance in the tank from the 1st outflow port provided in the solid upper edge formed by the processing thing in a tank,
The first outflow port faces the center of the solid.

In this case, in the methane fermentation tank,
A gas circulation part that recovers the gas generated in the tank and blows out into the tank from the second outlet provided in the bottom of the tank,
It is good as well.

The gas circulation part
A cylindrical body that is erected on the bottom surface in the tank so as to surround the second outflow port, and whose lower side surface and upper surface are opened;
It is good as well.

The second outlet and the cylindrical body are:
In the flow of the processed material formed in the tank by the processed material flowing out from the first outlet, it is disposed at a place where the processed material stays.
It is good as well.

The treated product circulation part is:
A heat exchanger that transmits heat of a gas engine that generates power using methane gas generated in the methane fermentation tank to a processed product,
It is good as well.

The methane fermentation apparatus according to the second aspect of the present invention,
A dry methane fermentation device,
A methane fermentation tank that ferments the processed material to generate methane gas while the processed material that is divided into three or more processing tanks and is put into the uppermost tank is sequentially sent to the lower processing tank,
The methane fermenter is
A gas circulation unit is provided that collects gas generated in the tank and blows out the gas from an outlet provided in the bottom of the tank.

In this case, the gas circulation unit
A cylindrical body that is erected on the bottom surface in the methane fermentation tank so as to surround the outlet and has a lower side surface and an upper surface opened,
It is good as well.

  According to the present invention, the methane fermentation tank is divided into three or more stages, and while the processed product is carried to the lower processing tank, there remains no unprocessed product that is not subjected to methane fermentation. It is possible to prevent the discharge of objects. Moreover, since the flow of the processed material can be created diagonally in the tank, the state of the processed material in the tank can be made uniform without requiring mechanical stirring. In addition, by passing the generated methane gas through the processed material, the processed material can absorb carbon dioxide, so that the concentration of methane gas can be increased.

It is a schematic diagram which shows the structure of the methane fermentation apparatus which concerns on embodiment of this invention. FIG. 2A is a top view of a part of the gas circulation unit. FIG. 2B is a side sectional view of a part of the gas circulation unit. FIG. 3A is a side view showing circulation of the processed product by the processed product circulation unit. FIG. 3B is a top view showing the circulation of the processed product by the processed product circulation unit. It is a figure which shows an example of the position where a gas circulation part is installed. It is a figure which shows the modification of a methane fermenter.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, the Z axis is the vertical direction, and the XY plane is the horizontal plane.

  The methane fermentation apparatus according to the present embodiment generates methane gas by methane fermentation of organic waste, and uses the generated methane gas as biomass energy. Here, the organic waste is a substance mainly composed of macromolecular organic compounds such as proteins, carbohydrates, fats and celluloses or compounds derived therefrom, and does not substantially contain solid inorganic compounds. However, some solid inorganic compounds may be contained as long as they can be easily solubilized and do not adversely affect the growth of microorganisms.

  Examples of such organic waste include organic waste such as livestock sludge, sewage sludge, and garbage such as kitchen waste. You may use these as a raw material which concentrated the solid concentration before the solubilization process. Moreover, you may add the organic substance of the metabolic pathway in the methane fermentation process which mixed saccharide | sugar, organic acid, and those.

  As shown in FIG. 1, the methane fermentation apparatus 1 includes a crusher 10, a mixing tank 20, a solubilization tank 30, a methane fermentation tank 40, a cooling tower 50, a desulfurization tower 60, a gas holder 70, and a gas engine. 80.

  The crusher 10 and the mixing tank 20 are connected by a pipe 11 that feeds a processed material (raw material), and a raw material pump 12 is inserted into the pipe 11. The mixing tank 20 and the solubilization tank 30 are connected by a pipe 21 for sending a processed material (raw material), and an electromagnetic three-way valve 22 is inserted into the pipe 21. Further, the solubilization tank 30 and the methane fermentation tank 40 are connected by a pipe 31 for sending a processed material (raw material), and an electromagnetic three-way valve 32 is inserted into the pipe 31. The electromagnetic three-way valve 22 and the electromagnetic three-way valve 32 are connected by a pipe 23 for sending a processed material (raw material), and a raw material pump 24 is inserted into the pipe 23.

  After the organic waste is put into the crusher 10, it is sent to the methane fermentation tank 40 through the pipe 11, the mixing tank 20, the pipe 21, the solubilization tank 30, and the pipe 31, and after methane fermentation, methane fermentation. It is discharged from the tank 40. The discharged processed material is used as compost.

  The methane fermentation tank 40 and the cooling tower 50 are connected by a pipe 51 that sends the generated methane gas. The cooling tower 50 and the desulfurization tower 60 are connected by a pipe 52 that sends methane gas. The desulfurization tower 60 and the gas holder 70 are connected by a pipe 61 that sends methane gas. The gas holder 70 and the gas engine 80 are connected by a pipe 71 that sends methane gas. Methane gas generated in the methane fermentation tank 40 is sent in the order of the pipe 51, the cooling tower 50, the desulfurization tower 60, the pipe 61, the gas holder 70, the pipe 71, and the gas engine 80.

  Organic waste is introduced into the crusher 10 from the outside. The crusher 10 crushes the input organic waste into an appropriate size. The pulverized processed product is sent to the mixing tank 20 through the pipe 11 by the raw material pump 12.

  A stirrer is provided inside the mixing tank 20, and the charged organic waste is stirred by the stirrer. Thereby, the organic waste accommodated in the mixing tank 20 is mixed and becomes a uniform state. The mixing tank 20 is provided with an ultraviolet irradiation unit. An ultraviolet irradiation part irradiates ultraviolet rays in the mixing tank 20 with a light emitting diode (LED), for example. The ultraviolet irradiation unit irradiates the processed material put into the mixing tank 20 with ultraviolet light to sterilize the processed material. The organic waste sterilized in the mixing tank 20 is sent to the solubilization tank 30 via the pipe 21.

  The solubilization tank 30 performs a solubilization process on the charged processed material. In the solubilization tank 30, for example, high-temperature solubilization treatment using solubilizing bacteria such as protease-producing bacteria is performed. A culture tank 33 is attached to the solubilization tank 30. In the culture tank 33, solubilized bacteria are cultured, and the solubilized bacteria are supplied from the culture tank 33 to the solubilization tank 30. The culture tank 33 and the UV-LED (ultraviolet irradiation device) 34 are inserted into the water supply pipe 35. The water sent from the water supply pipe 35 is sent to the culture tank 33 in a state sterilized by the UV-LED 34. The culture tank 33 sends water containing the solubilized bacteria to the solubilization tank 30 through the water supply pipe 35.

  The solubilization tank 30 is provided with an inner container 30 </ b> A for storing a processed product and an outer container 30 </ b> B provided so as to surround the inner container 30 </ b> A. The processed product to be solubilized is accommodated in the inner container 30A. A heat medium is accommodated between the outer container 30B and the inner container 30A. In the present embodiment, hot water is used as the heat medium. The temperature in the tank of the solubilization tank 30 is maintained at a high temperature by this heat medium.

  In the solubilization tank 30, a stirrer and a motor for stirring the organic waste are attached. Further, the solubilization tank 30 is provided with an air insertion port for supplying air to the organic waste, and air pumps 36 and 37 are connected to the air insertion port. Air is sent to the solubilization tank 30 by the air pumps 36 and 37. In this way, in the solubilization tank 30, solubilization is promoted under high temperature aerobicity by performing stirring or aeration. High temperature aerobic means a state in which organic waste is solubilized in a standard state (in an air atmosphere) at a temperature of 50 ° C. to 100 ° C., preferably without applying pressure.

  A solubilization process is a process which decomposes | disassembles into a low molecular state which can melt | dissolve the solid high molecular organic compound of a solid or water suspension form in water. In this embodiment, ultrahigh temperature solubilization is performed using protease-producing bacteria. Protease-producing bacteria are bacteria that can produce and secrete proteolytic enzymes (proteases) outside the cells.

  Examples of protease-producing bacteria include Bacillus species, and in particular, Bacillus sp. MU3 (Microbial Patent Deposit Center NITE AP-156). This heat-resistant protease-producing bacterium has an ultra-high temperature aerobic property that can sufficiently act even at 80 ° C. The enzyme produced by this bacterium has a molecular weight of about 57,000, excellent heat resistance, and high protein resolution in a wide pH range.

  The ultra-high temperature is 50 ° C to 100 ° C, preferably 60 ° C to 90 ° C, particularly preferably 70 ° C to 80 ° C. Ultra-high temperature solubilization is carried out in an aqueous medium under an aerobic or anaerobic condition, preferably an aerobic condition, and the organic waste concentration is 50 wt% or less, preferably 5 to 40 wt%, particularly preferably It is carried out in contact with a protease-producing bacterium in such an amount as to be 10 to 30 wt%. In this embodiment, under particularly preferable conditions, the solids concentration (DS) of the raw material can be increased to an organic waste concentration of 10 to 30 wt%, preferably at a DS of 20% or more, pH of 5 to 8, preferably around 6. The solubilization tank atmosphere is optimally aerobic.

  The time for digestion with protease-producing bacteria is 12 to 72 hours, preferably 24 to 48 hours. When implemented under aerobic or anaerobic conditions, it can be carried out under stirring and aeration conditions. When implemented under such conditions, as described later, ammonia can be removed in situ, solubilization of the raw material and ammonia removal can be performed simultaneously, and methane fermentation can be promoted. Bacillus sp. When MU3 is used as a protease-producing bacterium, since this bacterium is an aerobic thermostable bacterium, it can be solubilized with stirring while being aerated with air, and is optimal in terms of solubilization and ammonia removal.

  In the solubilization step according to this embodiment, in addition to protease-producing bacteria, microbial cells producing various degrading enzymes such as lipase-producing bacteria, glycosidase-producing bacteria and / or cellulase-producing bacteria may be added alone or in combination. Is possible. These can be used in the same reaction tank as long as the growth and proliferation conditions are similar, but if the conditions are different, a plurality of solubilization tanks 30 are provided, and each solubilization tank 30 is provided under different conditions. Can be used. In this case, after solubilization in a solubilization tank using a lipase-producing bacterium, glycosidase-producing bacterium and / or cellulase-producing bacterium, it is preferable to solubilize in a high-temperature solubilization tank using a protease-producing bacterium.

  An ammonia adsorption tank 38 is connected to the solubilization tank 30. The ammonia adsorption tank 38 is provided for adsorbing and removing ammonia generated in the solubilization process in the solubilization tank 30.

  The processed product solubilized in the solubilization tank 30 is sent to the methane fermentation tank 40 via the pipe 31. The methane fermentation tank 40 performs a methane fermentation process on the stored processed product.

  In the methane fermentation treatment, methane bacteria that normally operate in an anaerobic atmosphere are used, and their digestive action is utilized. The active temperature range of methane bacteria is usually 0 to 70 ° C., and there are some species that survive up to about 90 ° C. at higher temperatures, but almost die. In the low temperature region, the limit is 3 ° C to 4 ° C. The methane gas production rate is greatly influenced by this activation temperature.

  The higher the fermenter temperature, the faster the gas generation rate proceeds and the amount of gas generation increases. The following three temperature regions where methane bacteria are actually liable to live have been confirmed. (1) A low temperature region of 20 ° C. or lower, (2) a medium temperature region of 25 to 35 ° C., and (3) a high temperature region of 45 ° C. or higher. As for the temperature of the methane fermentation of the present invention, any of low temperature, medium temperature, and high temperature methane fermentation can be applied, but it is preferable to perform high temperature methane fermentation at 40 ° C to 70 ° C, and further methane fermentation at 50 ° C to 55 ° C. Is preferred.

  When organic waste that has been solubilized at high temperature is subjected to methane fermentation, it can be efficiently treated by adopting a dry process (dry process with a solid concentration of 10% or more). Even in the form, a dry processing method can be applied.

  In the present embodiment, since the solubilization treatment can be performed under high-temperature aerobic conditions and the methane fermentation treatment can be performed under anaerobic conditions, methane fermentation can be performed using the high temperature of the solubilization treatment. The temperature of the soda can be increased, and the bacteria growth condition has the advantage that the bacteria in the solubilization treatment (aerobic condition) are inactivated in the methane fermentation process (anaerobic condition), so that the methane fermentation is not disturbed. .

  In the present embodiment, the high-temperature aerobic property means a state in which organic waste is solubilized in a standard state (in an air atmosphere) at a temperature of 50 to 100 ° C., preferably without applying pressure.

  The methane fermentation tank 40 is divided into a first tank 40A, a second tank 40B, and a third tank 40C. The processed material input from the outside is first input to the first tank 40A, where methane fermentation proceeds. In this first tank 40A, the methane fermentation of about 95% of the processed product is completed. As the methane fermentation progresses, the specific gravity of the processed product becomes lighter, so it goes up and is sent to the second tank 40B over the side wall.

  Methane fermentation is also performed in the second tank 40B, and the processed product is sent to the third tank 40C to the extent that the remaining 1.2 to 2% of unprocessed material remains, that is, in a state where methane fermentation is almost completed. Methane fermentation is also performed in the third tank 40C. Methane fermentation is complete. The processed product for which methane fermentation has been completed is discharged from the third tank 40C to the outside.

  The methane fermentation tank 40 is provided with a gas circulation unit 40D that circulates gas by collecting gas (methane gas and carbon dioxide) generated by methane fermentation, taking it out and returning it to the inside. The gas circulation unit 40D is provided with a pipe 41 and a blower 42 for sending gas. The methane gas generated in the methane fermentation tank 40 by the blower 42 is sent to the pipe 41 and returned to the methane fermentation tank 40.

  As shown in FIGS. 2A and 2B, a cylindrical body 4 is erected on the bottom surface of the methane fermentation tank 40. A plurality of openings 4 </ b> A are provided on the lower side surface of the cylindrical body 4, and an opening 4 </ b> B is provided on the upper end of the cylindrical body 4. Further, the tip 41A of the pipe 41 extends to the center of the bottom surface in the cylindrical body 4, and gas is discharged from the opening (first outlet) of the tip 41A.

  The gas discharged from the tip 41 </ b> A of the pipe 41 rises in the cylindrical body 4. Due to the rising flow of the gas, the processed product 6 in the cylindrical body 4 also starts to rise. Then, the processed material 6 can flow from the outside to the inside of the cylindrical body 4 at the opening 4A, and the processed material can flow from the inside to the outside of the cylindrical body 4 at the opening 4B. Thereby, the flow of the upper and lower circulation of a processed material is formed inside the methane fermentation tank 40, and the processed material 6 is stirred.

  The gas discharged from the tip 41A of the pipe 41 is a mixed gas of methane gas and carbon dioxide. When this gas is discharged into the treated product 6, carbon dioxide is absorbed by the treated product 6, so that the ratio of methane gas can be improved. When the ratio of methane gas increases, the power generation efficiency in the gas engine 80 can be increased.

  Moreover, generation of ammonia gas can be suppressed by supplying carbon dioxide to the treated product 6. Since ammonia gas inhibits methane fermentation, methane fermentation can be promoted by supplying carbon dioxide to the treated product 6.

  Returning to FIG. 1, the methane fermentation tank 40 is provided with a treated product circulation section 40E that circulates the treated product 6 by collecting the treated product 6 and returning it to the inside. The treated product circulation unit 40E includes a pipe 43, a raw material pump 44, and electromagnetic three-way valves 45 and 46. The raw material pump 44 is inserted into the pipe 43. The processed product 6 discharged from the methane fermentation tank 40 by the raw material pump 44 is returned to the methane fermentation tank 40 via the pipe 43. The electromagnetic three-way valve 45 branches the pipe 43. The electromagnetic three-way valve 46 connects the pulverizer 10 and the pipe 43 via the pipe 13. A heat exchanger 47 is inserted into the pipe 43.

  As shown in FIGS. 3 (A) and 3 (B), the outlet 5 (second outlet) through which the processed product 6 sent through the pipe 43 flows out is the upper surface of the processed product in the methane fermentation tank 40. And it is attached to the upper corner part of the solid (cuboid) formed by processed material 6 of methane fermentation tank 40. Furthermore, the outflow port 5 faces the direction of the diagonal line of the solid (cuboid) formed by the processed object 6, that is, the direction of the center point of the solid.

  When the processed product 6 is discharged from the outlet 5, the processed product 6 in the methane fermentation tank 40 forms a flow as shown in FIGS. 3 (A) and 3 (B), thereby the processed product 6. The whole becomes agitated. The stirring by the gas was stirring in the vertical direction, but the stirring by the flow of the processed product 6 includes a horizontal flow.

  Although the processed material 6 is generally stirred by the flow shown in FIGS. 3A and 3B, a place where the processed material 6 stays appears in a part of the tank. Therefore, in the present embodiment, as shown in FIG. 4, if a mechanism for blowing the gas composed of the cylindrical body 4 or the like shown in FIG. The processing unevenness due to can be prevented.

  The gas generated in the methane fermentation tank 40 is sent to the cooling tower 50 to be cooled and output to the desulfurization tower 60. The desulfurization tower 60 performs a desulfurization process on the input gas, and outputs the extracted methane gas to the gas holder 70. The gas holder 70 stores methane gas. The gas engine 80 generates electricity by turning a gas turbine with methane gas sent from the gas holder 70. The electric power generated by the gas engine 80 is sent to a cubicle (power receiving facility) via the power line 81.

  The gas engine 80 generates heat by power generation. For this reason, a pipe 82 for flowing hot water and a cold / hot water pump 83 are provided between the gas engine 80 and the heat exchanger 84 so that the heat of the gas engine 80 is sent to the heat exchanger 84. It has become. The heat exchanger 84 is connected to the throwing heater 90 and the pipe 85. Thereby, the heat of the gas engine 80 is transmitted to the throwing heater 90 via the heat exchanger 84.

  A piping path for the heat medium is constructed between the throwing heater 90, the solubilization tank 30, and the heat exchanger 47. The heat medium heated by the throwing heater 90 is sent from the solubilization tank 30 to the heat exchanger 47 while returning to a throwing heater 90 from the heat exchanger 47 while keeping the temperature in the solubilization tank 30 constant. This heat medium circulation path is defined as a heat medium circulation section.

  The heat exchanger 47 performs heat exchange between the heat medium circulated in the heat medium circulation unit and the processed material circulated in the processed material circulation unit 40E. The processed product 6 heated by the heat exchanger 47 returns to the methane fermentation tank 40, and further methane fermentation is performed at a temperature with high fermentation efficiency. By such a heat exchanger 47, the temperature of the processed material fermented in the methane fermentation tank 40 is kept uniform, and is maintained so that the methane fermentation efficiency by the fermenting bacteria does not decrease.

  Next, operation | movement of the methane fermentation apparatus 1 is demonstrated.

  The processed product is pulverized by the pulverizer 10, stirred and sterilized in the mixing tank 20, solubilized in the solubilizing tank 30, and then subjected to methane fermentation in the methane fermentation tank 40. The methane fermentation tank 40 is divided into a first tank 40A, a second tank 40B, and a third tank 40C, and unprocessed products disappear while being sent to the lower processing tank. In the methane fermentation tank 40, the processed product is stirred and the carbon dioxide is adsorbed by the gas circulating unit 40D and the processed product circulating unit 40E, methane fermentation is performed, and methane gas is generated. Methane gas is accumulated in the gas holder 70 and used for power generation in the gas engine 80.

  The heat generated in the gas engine 80 is used to keep the solubilization tank 30 through the heat exchanger 84 → the throwing heater 90, and is further used to keep the processed product 6 through the heat exchanger 47.

  The processed product processed in the methane fermentation tank 40 is discharged from the methane fermentation tank 40. The discharged processed material can be used as compost. Since all processed products are processed, they do not smell rotten.

  As described above in detail, according to the present embodiment, the methane fermentation tank 40 is divided into three or more stages, and the methane fermentation is performed while the processed products are being conveyed to the lower processing tanks 40B and 40C. Since there is no unprocessed unprocessed material left, discharge of unprocessed material can be prevented. Moreover, since the flow of a processed material can be created on the diagonal in the methane fermentation tank 40, the processed material 6 in a tank can be equalize | homogenized, without requiring mechanical stirring. Further, by passing the generated methane gas through the treated product 6, carbon dioxide can be absorbed by the treated product, so that the concentration of methane gas can be increased.

  In addition, in this Embodiment, although the processing tank of the methane fermentation tank 40 was made into 3 steps | paragraphs, 4 or more steps | paragraphs may be sufficient.

  Moreover, in this Embodiment, although each processing tank 40A, 40B, 40C of the methane fermentation tank 40 was made into the rectangular parallelepiped, this invention is not limited to this, For example, a cylindrical shape may be sufficient. In this case, what is necessary is just to make the outflow port 5 face the center of the processed material 6. FIG.

  Moreover, the outflow port 5 does not need to face the center of the processed material 6. When the shape of the treatment tank is cylindrical, as shown in FIG. 5, the outlet 5 ′ is directed to the circumferential direction of the inner wall of the cylindrical methane fermentation tank (first tank) 40A ′. May be. In this case, the opening of the tip 41A of the pipe 41 and the cylindrical body 4 may be arranged at the center of the bottom surface of the methane fermentation tank (first tank) 40A '.

  In the present embodiment, the cylindrical body 4 is installed in the first tank 40A, but the cylindrical body 4 may be installed in the second tank 40B and the third tank 40C.

  In FIG. 1, the gas circulation unit 40D and the processed product circulation unit 40E are illustrated as circulating gas or processed material from the third tank 40C to the first tank 40A, but the first tank 40A, Gas and processed material may be circulated in the second tank 40B and the third tank 40C, respectively.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention and do not limit the scope of the present invention. In other words, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

  The present invention can be applied to a methane fermentation apparatus that performs methane fermentation.

  DESCRIPTION OF SYMBOLS 1 Methane fermentation apparatus, 4 cylindrical body, 4A, 4B opening, 5 outflow port, 6 processed material, 10 grinder, 11 piping, 12 raw material system pump, 13 piping, 20 mixing tank, 21 piping, 22 electromagnetic three-way valve, 23 Piping, 24 Raw material system pump, 30 Solubilization tank, 30A Inner container, 30B Outer container, 31 Piping, 32 Electromagnetic three-way valve, 33 Culture tank, 34 UV-LED (ultraviolet irradiation device), 35 Water supply pipe, 36, 37 Air pump 38 Ammonia adsorption tank, 40 Methane fermentation tank, 40A 1st tank, 40B 2nd tank, 40C 3rd tank, 40D Gas circulation section, 40E Processed material circulation section, 41 piping, 41A tip, 42 blower, 43 piping, 44 Raw material pump, 45, 46 electromagnetic three-way valve, 47 heat exchanger, 50 cooling tower, 51, 52 piping, 60 desulfurization tower, 61 piping, 70 gas hole , 71 pipe, 80 gas engine, 81 power line, 82 pipe, 83 cold water pump, 84 heat exchanger, 85 a pipe, 90 an immersion heater, 91, 92, and 93 pipe, 94 hot and cold water pump

Claims (7)

A dry methane fermentation device,
A methane fermentation tank that ferments the processed material to generate methane gas while the processed material that is divided into three or more processing tanks and is put into the uppermost tank is sequentially sent to the lower processing tank,
The methane fermenter is
The processing object which collects the processing thing in the bottom face in a tank, and is equipped with the processing thing circulation part which blows off the processing substance in the tank from the 1st outflow port provided in the solid upper edge formed by the processing thing in a tank,
The first outlet faces the center of the solid;
Methane fermentation equipment. The methane fermenter is
A gas circulation part that recovers the gas generated in the tank and blows out into the tank from the second outlet provided in the bottom of the tank,
The methane fermentation apparatus according to claim 1. The gas circulation part
A cylindrical body that is erected on the bottom surface in the tank so as to surround the second outflow port, and whose lower side surface and upper surface are opened;
The methane fermentation apparatus according to claim 1. The second outlet and the cylindrical body are:
In the flow of the processed material formed in the tank by the processed material flowing out from the first outlet, it is disposed at a place where the processed material stays.
The methane fermentation apparatus as described in any one of Claim 1 to 3. The treated product circulation part is:
A heat exchanger that transmits heat of a gas engine that generates power using methane gas generated in the methane fermentation tank to a processed product,
The methane fermentation apparatus as described in any one of Claim 1 to 4. A dry methane fermentation device,
A methane fermentation tank that ferments the processed material to generate methane gas while the processed material that is divided into three or more processing tanks and is put into the uppermost tank is sequentially sent to the lower processing tank,
The methane fermenter is
The gas generated in the tank is collected, and a gas circulation part that blows out into the tank from the outlet provided in the bottom of the tank is provided.
Methane fermentation equipment. The gas circulation part
A cylindrical body that is erected on the bottom surface in the methane fermentation tank so as to surround the outlet and has a lower side surface and an upper surface opened,
The methane fermentation apparatus according to claim 6.

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