Biogas plant and waste treatment method in biogas plant

Abstract

To provide a method for effectively treating a digestive juice residue formed by a wet type methane fermentation apparatus and conventionally massively stored without requiring storage in forming a recycling-oriented society.SOLUTION: A biomass gas plant includes, to a lineage where a hydrothermal reaction treatment apparatus is used as a first heating means and a digestive juice residue recovered from a wet type methane fermentation tank is subjected to hydrothermal reaction treatment, a lineage of a front stage treatment where the inside space is indirectly heated to evaporate moisture contained in the digestive juice residue and steam is formed from the moisture by using a hydrothermal reaction treatment apparatus as a third heating means, and a lineage of a subsequent stage treatment where the hydrothermal reaction treatment apparatus is used as a second heating means and the digestive juice residue after the moisture evaporation is subjected to semi-carbonization.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a biomass gas plant and a method for treating waste in a biomass gas plant.

Background Art

[0002] The use of waste-based biomass, i.e., waste raw materials, is effective not only for the formation of a recycling-based society but also for preventing global warming by reducing greenhouse gas emissions. A treatment method by methane gasification (i.e., biomass gasification) of waste raw materials is required.

[0003] Many wet methane fermentation facilities have been proposed for the methane gasification of waste raw materials. Biomass gas has been generated from various types of waste as raw materials by wet methane fermentation facilities and reused as energy.

[0004] In addition, various hydrothermal reaction treatment devices have been proposed as an effective method for the treatment method by methane gasification of waste raw materials.

[0005] Patent Document 1 describes a method for treating organic waste comprising a methane fermentation step, an incineration step of methane fermentation residue, and a methane gas recovery step.

[0006] Patent Document 2 describes a method for treating organic waste using a plurality of fermentation tanks.

[0007] Patent Document 3 describes a method for treating organic waste equipped with a wet methane fermentation device and a hydrothermal reaction treatment device, comprising a heating tank and a vacuum evaporation tank, and performing oxidative decomposition of the concentrated liquid under hydrothermal reaction conditions of a temperature of 250 to 600°C and a pressure of 4 to 10 MPa with 50 to 85% moisture suitable for hydrothermal reaction treatment.

[0008] Patent Document 4 describes a highly efficient methane fermentation method that uses subcritical water treatment to increase the amount of methane recovered from food waste, subjects the methane fermentation digestion residue to subcritical water treatment again to recover methane, and reduces the amount of methane fermentation digestion residue.

[0009] Patent Document 5 describes that the subcritical reaction vessel has a double structure consisting of an outer jacket vessel and a reaction vessel stored inside the outer jacket vessel.

[0010] Patent Document 6 describes methane fermentation using a pulverized bark fly body treated by a fryer.

[0011] Patent Document 7 describes a method for treating the digested liquid after methane fermentation, a device for treating the digested liquid after methane fermentation, and a methane fermentation system.

Prior Art Documents

Patent Documents

[0012]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Summary of the Invention

Problems to be Solved by the Invention

[0013] Patent Document 1 describes a method for treating organic waste having a methane fermentation process, and Patent Document 2 describes a method for treating organic waste using a plurality of fermentation tanks. Patent Document 3 describes a method for treating organic waste that includes a heating tank and a vacuum evaporation tank and makes the concentrated liquid into moisture suitable for hydrothermal reaction treatment. Patent Document 4 describes a high-efficiency methane fermentation method that uses subcritical water treatment to increase the methane recovery amount from food waste, re-treats the methane fermentation digestion residue with subcritical water to recover methane, and reduces the amount of methane fermentation digestion residue. Patent Document 5 describes a subcritical reaction vessel having a double structure composed of an outer jacket container and a reaction container stored inside the outer jacket container. Patent Document 6 shows subcritical water treatment, that is, hydrothermal reaction treatment or flash pyrolysis treatment by a fryer, as a pretreatment. Patent Document 7 describes a methane fermentation system having a power generation device that generates electricity using methane gas generated in a methane fermentation tank.

[0014] The above-mentioned patent documents describe a method for treating organic waste having a methane fermentation process or a wet methane fermentation device and a hydrothermal reaction treatment device, and a method for effectively treating and utilizing methane in a methane fermentation system equipped with a power generation device. However, an effective treatment method for the digestion liquid residue that is generated by a wet methane fermentation device and has been conventionally stored in large quantities is not described.

[0015] In view of this point, the present invention, in forming a recycling-oriented society, effectively treats and stores the Digested liquid residue generated by a wet methane fermentation device and conventionally stored in large quantities, and does not require a device or method for this purpose.

Means for Solving the Problem

[0016] The present invention includes a wet methane fermentation tank into which Treatment raw material of garbage waste is introduced, a treatment raw material input system provided in front of it for introducing Treatment raw material , a methane recovery system for recovering fermented methane, and a hydrothermal reaction treatment device provided after the wet methane fermentation tank. The hydrothermal reaction treatment device is Treatment raw materialAn inlet for charging, a mechanism for equalizing the reaction, and the generated Semi-carbonized powder material A pressure vessel having an outlet for discharging, and a heat source for hydrothermal reaction treatment and semi-carbonization powder treatment, The pressure vessel is composed of an outer cylindrical vessel and an inner cylindrical vessel, and the inner space inside the inner cylindrical vessel And the outer space formed between the inner cylindrical vessel and the outer cylindrical vessel are partitioned by the inner cylindrical vessel thereby, Steam is introduced into the inner space, and a first heating means for directly heating the inside of the inner space is provided, and a second heating means for directly heating the outside space and indirectly heating the inside of the inner space is provided, In the internal space, a hydrolysis treatment region capable of performing a hydrothermal reaction by hydrolysis at a hydrothermal reaction pressure by the first heating means can be formed, In the internal space, a semi-carbonization powder treatment region can be formed under a predetermined pressure by the second heating means thereby, Receiving the treatment raw material of waste Treatment raw material Receiving, after pretreatment Treatment raw material Charging and performing methane fermentation, and recovering the fermented Biomass gas which is methane gas and Biomass gas After recovering Digested liquid residue Recovering, and Digested liquid residue Hydrothermally reacting, in a waste treatment method using a biomass gas plant, Using a hydrothermal reaction treatment device as the first heating means, the Digested liquid residue recovered from the wet methane fermentation tank is hydrothermally reacted, and Using the hydrothermal reaction treatment device as the second heating means, the Digested liquid residue after moisture evaporation is semi-carbonized and powdered in the post-treatment, and Using the hydrothermal reaction treatment device as the third heating means to indirectly heat the inside of the inner space, Digested liquid residue The Moisture contained in is evaporated, and Moisture is generated and recovered from the steam, including the pre-treatment, Characterized in that it provides a waste treatment method using a biomass gas plant.

Effect of the Invention

[0017] According to the present invention, a hydrothermal reaction treatment apparatus is used as a heating means to indirectly heat the inner space therein, Digested liquid residue evaporate the moisture contained therein, Digested liquid residue reduce, and the evaporated Moisture can be made into a usable one or discharged into the environment, Moisture and it is not necessary to store water for a long time.

[0018] In forming a recycling-based society, Digested liquid residue effectively treat, and it is not necessary to store for a long time the Digested liquid residue generated by a wet methane fermentation apparatus and conventionally stored in large quantities.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0020] Biomass gas is utilized for power generation, heat supply, etc. It is a gas made from the gas generated by fermenting organic wastes such as livestock excrement and food waste, and its main component is methane.

[0021] In the present invention, the garbage waste supplied to the wet methane fermentation tank is Treatment raw material referred to as.

[0022] In the present invention, Treatment liquid refers to a liquid containing anaerobic bacteria, typically methanogens, during the treatment containing impurities during methane fermentation in a wet methane fermentation tank.

[0023] In the present invention, after methane fermentation in a wet methane fermentation tank, the methane fermentation residue recovered from the wet methane fermentation tank is Digested liquid residue referred to as.

[0024] In the present invention, The semi-carbonized powder material refers to in the hydrothermal reaction treatment device Of the digested liquid residue after the hydrothermal reaction treatment, the hydrothermal reaction treatment residue recovered from the hydrothermal reaction treatment device is Semi-carbonized solid powder residue referred to as.

[0025] In the present invention, the hydrothermal reaction treatment device refers to a subcritical water treatment device. Therefore, the hydrothermal reaction treatment is the same as the subcritical water treatment. Hydrothermal treatment is known as a treatment method for treating organic substances with water in a high-temperature and high-pressure state for effective utilization, and typically a subcritical water treatment device is used.

[0026] In the present invention, Semi-carbonized pellet refers to a form in which, when a powdered particulate semi-carbonized powder is obtained, the powdered particulate semi-carbonized powder after hydrothermal reaction mainly composed of the semi-carbonized powder is aggregated in a pellet shape.

[0027] Figure 1 is a diagram showing the configuration of a biomass gas plant according to an embodiment of the present invention in blocks.

[0028] In Figure 1, a biomass gas plant 100 according to an embodiment of the present invention includes a wet methane fermentation tank 2(1)(2) for inputting a treatment raw material 1 of garbage waste, a treatment raw material input system 3 provided in front of it for inputting Treatment raw material 1, a methane recovery system 4, a hydrothermal reaction treatment device 5 provided in the subsequent stage of the wet methane fermentation tank 2, a hydrothermal reaction treatment and semi-carbonization treatment system 6 including the hydrothermal reaction treatment device 5, and a system 7 that uses the hydrothermal reaction treatment device 5 as a heating means, that is, a boiler, and is configured with systems and devices.

[0029] The treatment raw material input system 3 consists of one system, and in this example, the wet methane fermentation tank 2 consists of the wet methane fermentation tank (1) and the wet methane fermentation tank (2) under anaerobic conditions. Accordingly, the methane recovery system 4, the hydrothermal reaction treatment device 5, the hydrothermal reaction treatment and semi-carbonization pulverization treatment system 6, and the system 7 that uses the hydrothermal reaction treatment device 5 as a boiler consist of two systems. Regarding these systems, one system will be described, and for the other systems, the description of one system will be applied.

[0030] The treatment raw material input system 3 includes a waste raw material collection device 11, a fryer 12, and a pulverizer 13. It collects the treatment raw material of the collected garbage waste in the waste raw material collection device 11. For the solids in the treatment raw material, it is made into fly ash by the fryer 12, pulverized by the pulverizer 13 to be subdivided, and mixed with liquid waste to form a slurry Treatment raw material and is put into the wet methane fermentation tank 2.

[0031] The Treatment raw feed of garbage waste mainly consists of livestock manure, waste milk, dairy miscellaneous wastewater, sewage sludge, and other wastes.

[0032] By putting the slurry Treatment raw material into the wet methane fermentation tank 2, it is Treatment liquid is generated made inside the wet methane fermentation tank.

[0033] The wet methane fermentation tank 2 is provided with an input device 21 at the head of the wet methane fermentation tank, and an input port is provided. The wet methane fermentation tank 2 is connected with a methane discharge port, a digestion liquid residue discharge port containing digestion liquid, and a fermentation bacteria input device (not shown).

[0034] The wet methane fermentation tank 2 is configured as a cylindrical tank, equipped with an input port for putting in the Treatment raw material of garbage waste, equipped with a stirrer 22 inside, and driven by a drive motor 23 to stir the internal slurry Treatment liquid In this example, it is equipped with a stirrer 22 inside and driven by a drive motor 23 to stir the internal slurry Treatment liquidAlthough an example of agitation has been shown, a stirring pump may be provided inside or outside the wet methane fermentation tank 2 to Treatment liquid agitate it.

[0035] The methane recovery system 4 is composed of a methane gas recovery device 41 and a methane gas purification device 42, and is connected to a biomass gas utilization device 43.

[0036] The treatment raw material input system 3 uses the treated raw material 1 with increased calorie content to generate biomass gas mainly composed of methane gas (CH 4 ) and carbon dioxide (CO 2 ). A high-calorie biomass gas is obtained and used in the biomass gas utilization device 43.

[0037] In the wet methane fermentation tank 2, From the treatment liquid when methane, that is, biomass gas, is recovered, Treatment liquid residue remains in the wet methane fermentation tank. The treatment liquid residue is It is discharged from the bottom of the wet methane fermentation tank 2 to the temporary storage tank 30, and then discharged from the temporary storage tank 30 to the hydrothermal reaction treatment device 5.

[0038] The digested liquid residue is discharged from the bottom of the wet methane fermentation tank 2 to the primary storage tank 30 and temporarily stored. After primary storage, it is discharged to the hydrothermal reaction treatment device 5. The primary storage tank 30 has a buffer function for quantitative adjustment between the wet methane fermentation tank 2 and the hydrothermal reaction treatment device 5. A pipe is provided to return the The treatment liquid residue stored in the primary storage tank 30 to the input device 21, and a part of the The treatment liquid residue is returned to the wet methane fermentation tank 2, and the The treatment liquid residue may be subjected to methane fermentation again to increase the methane fermentation amount.

[0039] The treatment liquid residue It is treated in the system 7 that uses the hydrothermal reaction treatment device 5 as a heating means, that is, a boiler, and heated until it reaches a water content suitable for the hydrothermal reaction treatment in the hydrothermal reaction treatment device 5. Moisture is evaporated.

[0040] Digested liquid residue with a predetermined amount of moisture removedIt is processed in the hydrothermal reaction treatment and semi-carbonization treatment system 6.

[0041] The hydrothermal reaction treatment apparatus 5 provided in the hydrothermal reaction treatment and semi-carbonization powder treatment system 6 includes a pressure vessel 51 having a double-tube structure and a heat source (not shown). Further, the hydrothermal reaction treatment apparatus 5 includes a stirrer 52 and a drive machine 53 for rotationally driving the stirrer 52 inside the pressure vessel.

[0042] In this way, the hydrothermal reaction treatment apparatus 5 includes a heat source for hydrothermal reaction treatment and semi-carbonization powder treatment, a pressure vessel, a digested liquid residue inlet provided in the pressure vessel after methane fermentation, a mechanism for homogenizing the hydrothermal reaction treatment inside the vessel, and a generated Semi-carbonized powder material is provided with an outlet for taking out the semi-carbonized powder to the semi-carbonized powder recovery apparatus 61. The generated steam is sent to the steam cooling apparatus 72 of the system 7 that uses the hydrothermal reaction treatment apparatus 5 as a heating means, i.e., a boiler, and is liquefied into Moisture and is made into.

[0043] The function of the hydrothermal reaction treatment apparatus 5 will be described later with reference to FIG. 2.

[0044] The hydrothermal reaction treatment and semi-carbonization powder treatment system 6 is composed of a semi-carbonized powder recovery apparatus 61 for recovering the generated Semi-carbonized powder material and a semi-carbonized pellet production apparatus 62, and is connected to a pellet utilization apparatus 63.

[0045] System 7 that uses the hydrothermal reaction treatment device 5 as a heating means, typically a boiler is composed of a steam cooling apparatus 71 having a steam inlet, a water storage apparatus 72, and a water purification apparatus 73, and the generated Moisture is discharged to an external system 74. Alternatively, the generated and recovered Moisture is utilized in various apparatuses in various usage methods. Typically, as shown in FIG. 1, using a line where the system 74 is branched, it can circulate as the water source of the boiler used for the boiler 102, i.e., the heat source of the heating means. Water medium In this case, the heat source of the heating means functions as a heating apparatus, typically as a boiler.

[0046] The water generated in the post-treatment is, Water medium As such, a waste treatment method using a biomass gas plant that supplies the heat source of any one or all of the first to third heating means is formed.

[0047] The water generated by the steam cooling device 71 Moisture is water with high purity that is sufficiently clean and does not contain impurities, but is sent to the water purification device 73 for reprocessing. The water purification device 73 performs removal of malodor, sterilization, decomposition of organic poisons, and removal of solid matter on the generated Moisture . As a device for performing such treatment, a high-temperature and high-pressure water decomposition device is widely known.

[0048] In this way, the biomass gas plant Digested liquid residue is used to perform hydrothermal reaction treatment and semi-carbonization pulverization treatment on Digested liquid residue , and the inner space is indirectly heated using a hydrothermal reaction treatment and semi-carbonization pulverization treatment system and a hydrothermal reaction treatment device as heating means, and

[0049] Figure 2 is a diagram showing an example of the configuration of the hydrothermal reaction treatment device used in the embodiment of the present invention.

[0050] In Figure 2, the hydrothermal reaction treatment system is composed of a treatment raw material input system, a hydrothermal reaction treatment device including a heat source for supplying heat, a hydrothermal reaction residue treatment system, and a control device. The general hydrothermal reaction treatment system itself has a well-known configuration.

[0051] In the embodiment of the present invention, the hydrothermal reaction treatment device 5 includes a pressure vessel (also called a reactor) 101. The pressure vessel 101 is connected to a boiler 102 used as a heat source for supplying steam using a water medium, and is connected to a treatment raw material input system 3, a methane recovery system 4, and a hydrothermal reaction treatment and semi-carbonization treatment system 6. A control device 105 for controlling the temperature, pressure, and treatment time inside the pressure vessel is provided.

[0052] The pressure vessel 101 is composed of an outer cylindrical vessel (also referred to as an outer jacket) 111 and an inner cylindrical vessel (also referred to as an inner jacket) 112 disposed with a space on the inner wall of the outer cylindrical vessel 111. A stirrer 113 (the stirrer 52 in FIG. 1) is provided in the space (inner space) 106 inside the inner cylindrical vessel.

[0053] The pressure vessel 101 is provided with lids 114 and 115 for closing at both ends. On one lid 115, a drive motor 116 (the drive motor 53 in FIG. 1) is provided on its side. The drive motor 116 is connected to a stirrer 113 having rotating blades.

[0054] An outer temperature sensor and an outer pressure sensor 121 for measuring the temperature and pressure in the space (outer space) 107 between the outer cylindrical vessel 111 and the inner cylindrical vessel 112, an inner temperature sensor and an inner pressure sensor 122 for measuring the temperature and pressure in the space (inner space) 106 of the inner cylindrical vessel 112, and a moisture sensor 123 for measuring the moisture in the space of the inner cylindrical vessel 112 are provided. The temperature and pressure in the inner space 106 are measured, the moisture in the inner space 106 of the inner cylindrical vessel 112 is measured, and each measured value is transmitted to the control device 105 via an electronic circuit as a data signal. These signal data are recorded in the recording means of the control device 105. The measured moisture content is used for setting the control data of the semi-carbonization treatment time.

[0055] The pressure vessel 101 is provided with a steam discharge pipe 118 connected to the inner cylindrical vessel 112, and a discharge control valve 119 is provided on the steam discharge pipe 118. With this configuration, the steam in the inner space can be discharged to the outside. The pressure vessel 101 is provided with a charging hopper 125 connected to the inner cylindrical vessel 112, and has a discharge port with a discharge pipe 126 connected to the inner cylindrical vessel 112. A discharge control valve 120 is provided on the discharge pipe 126. With this configuration, the Semi-carbonized powder material generated by using the hydrothermal reaction treatment can be recovered to the outside, that is, to the semi-carbonized powder recovery device 61.

[0056] The crusher 103 (representing the crusher 13 in Fig. 1) receives the collected Treatment raw material 131 (representing Waste raw material 1 in Fig. 1), crushes Treatment raw material 131, and feeds the pulverized waste into the input hopper 125 to Treatment raw material form Treatment liquid . A control valve 138 is provided in the input hopper 125, and Treatment raw material the input of 131 and the fermentation treatment of the treatment liquid are controlled by the control device 105.

[0057] The crushing operation of the crusher 103 is controlled by a control device 105 connected by an electronic circuit.

[0058] Treatment raw material 131 is of a type that is discriminated at the collected stage. Treatment raw material In many cases, the discrimination of the type of the treatment raw material is made by the treatment raw material processor. A photographing means (not shown) is attached near the input hopper 125, and by comparing the video photograph with a reference video photograph and providing a discrimination means (not shown) for Treatment raw material the type, the discrimination of the type of Treatment raw the feed can be automatically performed. The discrimination data is input into the control device 105.

[0059] The boiler 102 is provided with a steam supply line 133 that supplies the generated steam to the pressure vessel 101. A superheated steam generator 140 is provided in the steam supply line 133 to superheat the generated steam and supply it to the pressure vessel 101.

[0060] The steam supply path 133 branches into a branch path 134 that supplies superheated steam into the space between the outer cylindrical container 111 and the inner cylindrical container 112 and a branch path 135 that supplies superheated steam into the space of the inner cylindrical container 112, and control valves 136 and 137 are installed in each branch path. The control valves 136 and 137 are connected to the control device 105, and their opening and closing are controlled and adjusted by the control device 105. The superheated steam is supplied to the space between the outer cylindrical container 111 and the inner cylindrical container 112, and / or the space of the inner cylindrical container 112. By providing the superheated steam generator 140, the internal temperature, that is, the hydrothermal reaction treatment temperature, can be increased without being proportional to the pressure inside the inner cylindrical container.

[0061] The hydrothermal reaction treatment device 5 includes an inlet for the treatment raw material, a mechanism for equalizing the hydrothermal reaction, and an outlet for taking out the product after the hydrothermal reaction treatment, and is composed of a pressure vessel, a heat source for the hydrothermal reaction treatment and heat treatment, and a control device for controlling the hydrothermal reaction treatment and heat treatment. Semi-carbonized powder material Through the hydrothermal reaction treatment and heat treatment, Digested liquid residue is generated. Semi-carbonized powder material

[0062] The hydrothermal reaction treatment device 5 Digested liquid residue processes to generate Semi-carbonized powder and is equipped with a semi-carbonized powder recovery means 141 for recovering the generated Semi-carbonized powder . Although not shown, a part of the Digested liquid residue discharged from the wet methane fermentation tank 2 may be returned to the wet methane fermentation tank 2 and used to increase the amount of methane fermentation.

[0063] The pressure vessel is composed of an outer cylindrical container and an inner cylindrical container, and the inner space inside the inner cylindrical container and the outer space between the inner cylindrical container and the outer cylindrical container are partitioned by the inner cylindrical container.

[0064] By the control means, in the hydrolysis treatment region, the hydrothermal reaction temperature in the subcritical reaction region of water is set under a predetermined pressure, and in the hydrolysis treatment region, Digested liquid residue is hydrolyzed to obtain a hydrolyzed substance, that is, Digested liquid residue as the treatment result ofSemi-carbonized powder material Generate

[0065] For example, introduce water vapor into the inner space, and control it within the hydrothermal reaction temperature of 230 °C or less and the hydrothermal reaction pressure of 2.5 MPa or less in the subcritical reaction region of water, typically in the hydrothermal reaction region within the hydrothermal reaction pressure of 0.3 to 3.5 MPa, and form a hydrolysis treatment region controlled by an appropriately set hydrothermal reaction treatment time to Digested liquid residue Hydrolyze to obtain a powdery hydrolyzed substance Semi-carbonized powder material Generate

[0066] Stop introducing water vapor into the inner space and discharge the water vapor in the inner space to the outside.

[0067] In the drying and semi-carbonization treatment region, under a predetermined pressure Treatment raw material Set the semi-carbonization powdering treatment temperature obtained from the type and calorific value multiple, and use the hydrothermal reaction treatment of the hydrolyzed substance with a predetermined calorific value, having a predetermined calorific value relative to the calorific value of wood chips, and a moisture content of 2 to 20%, preferably 3 to 6% to Semi-carbonized powder material Generate

[0068] For example, form a semi-carbonization powdering treatment region in the outer space with a carbonization temperature within 230 °C or more and within the hydrothermal reaction temperature, and control the treatment time, and from the hydrolyzed substance, based on the hydrothermal reaction treatment Semi-carbonized pellet , typically, using a hydrothermal reaction treatment with a high calorific value Semi-carbonized pellet Form. Generate Semi-carbonized powder material Which is a dried, semi-carbonized, and powdered hydrothermal reaction solid A part of the semi-carbonized powder material may be used for other purposes.

[0069] Regarding wood chips, those with a moisture content of 35 to 50% and a calorific value of 3300 kcal / kg are widely known. In the present invention, when calculating the calorific value multiple, wood chips with a calorific value of 3300 kcal / kg are used as the reference wood chips. According to the analysis of the inventors, those with a water content of 40% and Semi-carbonized powder material With a calorific value of 3300 kcal / kg were confirmed.

[0070] According to the experiments of the inventors, by providing a semi-carbonized powder pellet forming system, the water content is dried and semi-carbonized to 3-6%, and the calorific value is 1.25 times or more than that of the wood chips with a water content of 35-50% and a calorific value of 3300 kcal / kg, using the hydrothermal reaction treatment Semi-carbonized powder material It was confirmed that it can be manufactured.

[0071] It is possible to form a semi-carbonized powder forming treatment region with a semi-carbonization temperature within 230°C and controlled treatment time.

[0072] Powdery particles Semi-carbonized powder material When obtained, the above-mentioned Mainly composed of semi-carbonized powder material After the hydrothermal reaction semi-carbonization of powdery particles Semi-carbonized powder material In the form of aggregation of Semi-carbonized pellet Based on the hydrothermal reaction can be formed.

[0073] After the hydrothermal reaction semi-carbonized powder Semi-carbonized powder material With the recovery 141 of the semi-carbonized powder material to the semi-carbonized powder material recovery device 61 after the hydrothermal reaction, detoxification and volume reduction 142 of harmful substances are carried out.

[0074] Thus, · High calorific value resource utilization: Having a calorific value multiple of 1.25, preferably 1.5 or more, with respect to the calorific value 1 of wood chips Semi-carbonized powder material Manufacture of · Suppression of carbon dioxide, dioxin, and odor Is achieved.

[0075] In this embodiment, in FIG. 1, the hydrothermal reaction treatment device 5 is used. The configuration of the hydrothermal reaction treatment device 5 is substantially the same as the configuration of the hydrothermal reaction treatment device 5 shown in FIG. 2 described above.

[0076] In this way, the pressure vessel is composed of an outer cylindrical container and an inner cylindrical container, and the inner space inside the inner cylindrical container and the outer space formed between the inner cylindrical container and the outer cylindrical container are partitioned by the inner cylindrical Container, and Partitioned by the cylindrical container, A first heating means for introducing steam into the inner space and directly heating the inner space is provided, and a second heating means for directly heating the outer space and indirectly heating the inner space is provided. In the internal space, a hydrolysis treatment region for performing a hydrothermal reaction by hydrolysis at a hydrothermal reaction pressure can be formed by the first heating means. In the internal space, a drying / semi-carbonization treatment region can be formed by the second heating means under a predetermined pressure, replacing the hydrolysis treatment region. It is possible to form a drying / semi-carbonization treatment region.

[0077] Furthermore, it includes a hydrothermal reaction treatment apparatus 5 using a pressure vessel with a double-tube structure, a hydrothermal reaction treatment and semi-carbonization powdering treatment system 6, and a system 7 that uses the hydrothermal reaction treatment apparatus 5 as a heating means, i.e., a boiler, to form a system.

[0078] In this way, for a system that uses the hydrothermal reaction treatment apparatus as the first heating means to perform hydrothermal reaction treatment on [substance] recovered from a wet methane fermentation tank, the hydrothermal reaction treatment apparatus is used as the third heating means to indirectly heat the inner space. Digested liquid residue Evaporate the moisture contained in [substance], and a pre-treatment system for generating water from steam, and a post-treatment system for semi-carbonizing and powdering [substance] after moisture evaporation using the hydrothermal reaction treatment apparatus as the second heating means are included to form a biomass gas plant. Digested liquid residue Furthermore, a biomass gas plant and a waste treatment method using the biomass gas plant are configured, in which [substance] generated in the pre-treatment system is supplied as a water medium to the heat source of any one or all of the first to third heating means. Digested liquid residue A biomass gas plant is configured that includes a pre-treatment system for evaporating the moisture contained in [substance] and generating water from steam by indirectly heating the inner space using the hydrothermal reaction treatment apparatus as the third heating means, and a post-treatment system for semi-carbonizing and powdering the moisture-evaporated [substance] using the hydrothermal reaction treatment apparatus as the second heating means.

[0079] Furthermore, a biomass gas plant and a waste treatment method using the biomass gas plant are configured, in which [substance] generated in the pre-treatment system is supplied as a water medium to the heat source of any one or all of the first to third heating means. Moisture A biomass gas plant and a waste treatment method using the biomass gas plant are configured, in which [substance] generated in the pre-treatment system is supplied as a water medium to the heat source of any one or all of the first to third heating means.

[0080] Figure 3 is a diagram showing the relationship between the semi-carbonization treatment temperature and the calorific value in the semi-carbonization calorific value peak zone for wood chips on the X-Y axis coordinates.

[0081] When the semi-carbonization treatment temperature was 25°C at room temperature, calorific value data with a calorific value of 3300 kcal and a calorific value multiple of 1.0 was obtained. When exceeding room temperature, a calorific value multiple with a calorific value multiple of 1.0 (excluding 1.0) can be obtained at the semi-carbonized powder treatment temperature. When the semi-carbonized powder treatment temperature was 200°C, calorific value data with a peak calorific value of 5330 kcal and a calorific value multiple of 1.62 was obtained. As shown in the figure, a semi-carbonization calorific value peak zone can be set. It becomes wood chips Treatment raw material In the case of, a semi-carbonization calorific value peak zone with a semi-carbonization treatment temperature (°C) of 180 to 230 can be set. Through the treatment in this zone, calorific value data with a maximum calorific value of 5330 kcal and a calorific value multiple of 1.5 or more can be obtained.

[0082] Other Treatment raw material Similarly, a semi-carbonization calorific value peak zone can be set for others as well. A semi-carbonization calorific value peak zone has been set.

[0083] Derived from the hydrothermal reaction treatment device connected to the downstream side of the wet methane fermentation device Semi-carbonized powder material From, it is semi-carbonized to a moisture content of 3 to 6%, and has a calorific value multiple of 1.5 times or more compared to the calorific value of wood chips with a reference raw material calorific value of 3,300 kcal Semi-carbonized pellet A method for generating is proposed.

[0084] Figure 4 is a diagram showing the configuration of a semi-carbonized powder production device by hydrothermal reaction, which is another embodiment of the present invention.

[0085] The configuration of the hydrothermal reaction device 5 is substantially the same as the configuration of the hydrothermal reaction device shown in Figure 1.

[0086] The hydrothermal reaction device 5 shown in Figure 4 is provided with a heating heater 117 in the external space 107, and a heating power supply 102A is provided in parallel in addition to the boiler 102. The heating power supply 102A is connected to the control device 105 in an electric circuit and is controlled for ON and OFF.

[0087] The heating heater 117 is electrically heated by the electrical supply from the heating power supply 102A.

[0088] The outer space 107 is heated by a heat medium from a heating heater 117 instead of steam heat, which is different from the configuration of the hydrothermal reaction apparatus 5 shown in FIG. 1. From the hydrolyzed treatment substance, by hydrothermal reaction Semi-carbonized pellet , typically, of high calorific value Semi-carbonized pellet can be manufactured by the dry and semi-carbonized hydrothermal reaction Semi-carbonized powder material to generate is the same.

[0089] Introduce water vapor into the inner space, and in the hydrothermal reaction region within the hydrothermal reaction temperature of 230 ° C or less and the hydrothermal reaction pressure of 3.5 MPa or less in the subcritical reaction region of water, typically within the hydrothermal reaction pressure of 2.5 MPa, and control it to the appropriately set hydrothermal reaction treatment time to form a low-temperature hydrolysis treatment region, Digested liquid residue is hydrolyzed to form a powdery hydrolyzed treatment substance Semi-carbonized powder material is not different from the precedent, but in the outer space, a low-temperature drying and semi-carbonization treatment region with a semi-carbonized powdering temperature within 230 ° C or higher than the hydrothermal reaction temperature and the treatment time controlled is electrically heated and formed by a heating heater 117 by energization from a heating power source 102A.

[0090] FIG. 5 is a diagram showing in blocks the configuration of a waste treatment method using a biomass gas plant according to an embodiment of the present invention.

[0091] The waste treatment method using a biomass gas plant has the following steps.

[0092] S1: Collect the Treatment raw material of garbage waste, slurrying, and input into a wet methane fermentation tank S2: Methane gas fermentation in a wet methane fermentation tank S3: Methane gas is recovered, purified, and Biomass gas obtained S4: After methane gas fermentation Digested liquid residue is discharged to the hydrothermal reaction treatment apparatus S5: Treatment in the hydrothermal reaction treatment apparatus: S51 Pretreatment: Using the system that uses the hydrothermal reaction treatment device as a boiler, Digested residue evaporation and hydration treatment of the moisture contained in S52 Intermediate treatment: Using the hydrothermal reaction treatment + semi-carbonization powder treatment system, the moisture content suitable for the hydrothermal reaction treatment Digested liquid residue is subjected to hydrothermal reaction treatment by hydrolysis S53 Post-treatment: Using the hydrothermal reaction treatment + semi-carbonization powder treatment system, after the hydrothermal reaction treatment Digested liquid residue is indirectly heated and recovered to perform semi-carbonized powder recovery treatment and semi-carbonized pellet production treatment S6: Biomass gas utilization of Semi-carbonized pellet and utilization of In this way, by the hydrothermal reaction treatment device, Biomass gas after recovering Digested liquid residue is recovered, and Digested liquid residue before and after the hydrothermal reaction treatment, Digested liquid residue is subjected to hydrothermal reaction treatment and pre-treatment for semi-carbonization powder treatment, and the inside space is indirectly heated using the thermal reaction treatment device as a boiler, Digested liquid residue the moisture contained in Moisture is evaporated to make steam,

[0093] The regenerated Biomass gas and the biomass pellet Semi-carbonized pellet can be used as electricity by external facilities such as gas turbines, gas engines, fuel cells, etc., or sold to power companies, and can also be used for absorption chillers and heaters through boilers. The regenerated Biomass gas and Semi-carbonized pellet can also be used as raw materials for green hydrogen production devices.

[0094] Thus, in forming a recycling-oriented society, by adopting a high-efficiency methane fermentation method in a wet methane fermentation tank and using waste raw materials with increased calorie content in the pretreatment to perform high-efficiency methane fermentation, Biomass gas is collected, and in the post-treatment Biomass gas after collecting Digested liquid residue can be efficiently and effectively utilized.

[0095] The regenerated water is discharged to an external system. Alternatively, the generated Moisture is utilized in various devices in various ways. Typically, it is used as a water medium in a boiler. It can circulate as the water medium used for the water source of the boiler, i.e., the heat source of the heating means.

Explanation of Reference Numerals

[0096] 100…biomass gas plant, 1…garbage waste Treatment raw material , 2…wet methane fermentation tanks (1)(2), 3…treatment raw material input system, 4…methane recovery system, 5…hydrothermal reaction treatment device provided downstream of wet methane fermentation tank 2, 6…hydrothermal reaction treatment and semi-carbonization powdering treatment system, 7…system for using hydrothermal reaction treatment device 5 as a heating means, i.e., a boiler, 11…waste raw material collection device, 12…fryer, 13…pulverizer, 21…input device 22…agitator, 23…driver, 30…temporary storage tank, 41…methane gas recovery device, 42…methane gas purification device, 43…biomass gas utilization device, 52…agitator, 53…driver, 61…semi-carbonized powder recovery device, 62…semi-carbonized pellet production device, 63…pellet utilization device, 71…steam cooling device, 72…water storage device, 73…water purification device, 74…external system, 101…pressure vessel, 102…boiler, 102A…heating power source, 111…outer cylindrical container (also referred to as outer jacket), 112…inner cylindrical container (also referred to as inner jacket), 117…heating heater.

Claims

1. A wet methane fermentation tank for injecting a treatment raw material for garbage waste, a treatment raw material injection system provided in the front stage thereof for injecting the treatment raw material, a methane recovery system for recovering fermented methane, and a hydrothermal reaction treatment device provided in the rear stage of the wet methane fermentation tank, In a biomass gas plant that includes a treatment raw material receiver for receiving the treatment raw material of garbage waste, injecting the pre-treated treatment raw material for methane fermentation, recovering the biomass gas that is the fermented methane gas, recovering the treatment liquid residue after recovering the biomass gas, and subjecting the treatment liquid residue to hydrothermal reaction treatment, The hydrothermal reaction treatment device includes a pressure vessel having an inlet for injecting the treatment raw material of garbage waste, a mechanism for equalizing the reaction, and an outlet for taking out the generated semi-carbonized powder material, and a heat source for hydrothermal reaction treatment and semi-carbonization powder treatment, The pressure vessel is composed of an outer cylindrical vessel and an inner cylindrical vessel, and the inner space inside the inner cylindrical vessel and the outer space formed between the inner cylindrical vessel and the outer cylindrical vessel are partitioned by the inner cylindrical vessel, A first heating means for introducing steam into the inner space and directly heating the inside of the inner space is provided, and a second heating means for directly heating the outside space and indirectly heating the inside of the inner space is provided, In the internal space, a hydrolysis treatment region capable of performing a hydrothermal reaction by hydrolysis at a hydrothermal reaction pressure can be formed by the first heating means, In the internal space, a semi-carbonization powder treatment region can be formed under a predetermined pressure by the second heating means, Using the hydrothermal reaction treatment device as a third heating means to indirectly heat the inside of the inner space, evaporate the moisture contained in the treatment liquid residue, and recover the moisture from the steam, a pre-treatment system, Using the hydrothermal reaction treatment device as a first heating means to perform hydrothermal reaction treatment on the digested liquid residue recovered from the wet methane fermentation tank, and Comprising a post-treatment system for semi-carbonizing the digested liquid residue after moisture evaporation using the hydrothermal reaction treatment device as a second heating means. A biomass gas plant characterized by this.

2. In the biomass gas plant according to Claim 1, The moisture generated in the post-treatment system is supplied as a water medium to any one or all of the first to third heating means. A biomass gas plant characterized by this.

3. ​ ​ ​ A wet methane fermentation tank for inputting treatment raw materials of garbage waste, a treatment raw material input system provided in the front stage thereof for inputting treatment raw materials, a methane recovery system for recovering fermented methane, and a hydrothermal reaction treatment device provided in the rear stage of the wet methane fermentation tank, The hydrothermal reaction treatment device includes an inlet for inputting treatment raw materials of garbage waste, a mechanism for equalizing the reaction, and an outlet for taking out the generated semi-carbonized powder material, a pressure vessel, and a heat source for hydrothermal reaction treatment and semi-carbonization powder treatment, The pressure vessel is composed of an outer cylindrical container and an inner cylindrical container, and the inner space inside the inner cylindrical container and the outer space formed between the inner cylindrical container and the outer cylindrical container are partitioned by the inner cylindrical container thereby. A first heating means for introducing steam into the inner space and directly heating the inside of the inner space is provided, and a second heating means for directly heating the outside space and indirectly heating the inside of the inner space is provided, In the internal space, a hydrolysis treatment region capable of performing a hydrothermal reaction by hydrolysis at a hydrothermal reaction pressure by the first heating means can be formed, In the internal space, a semi-carbonization powder treatment region can be formed under a predetermined pressure by the second heating means thereby. In a waste treatment method using a biomass gas plant, which includes receiving treatment raw materials of garbage waste, inputting the pre-treated treatment raw materials for methane fermentation, recovering the fermented methane gas, i.e., biomass gas, and recovering the digestion liquid residue after recovering the biomass gas, and subjecting the digestion liquid residue to hydrothermal reaction treatment, using the hydrothermal reaction treatment device as the first heating means to perform hydrothermal reaction treatment on the digestion liquid residue recovered from the wet methane fermentation tank, and using the hydrothermal reaction treatment device as the second heating means to perform a post-treatment of semi-carbonizing the digestion liquid residue after moisture evaporation, and using the hydrothermal reaction treatment device as the third heating means to indirectly heat the inside of the inner space, evaporate the moisture contained in the digestion liquid residue, and recover the moisture from the steam, including a pre-treatment, characterized in that it is a waste treatment method using a biomass gas plant.

4. In the waste treatment method using the biomass gas plant according to claim 3, the moisture generated in the post-treatment is supplied as a water medium to the heat source of any one or all of the first to third heating means, characterized in that it is a waste treatment method using a biomass gas plant.

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