WO2022131122A1 - 水熱処理システム - Google Patents
水熱処理システム Download PDFInfo
- Publication number
- WO2022131122A1 WO2022131122A1 PCT/JP2021/045313 JP2021045313W WO2022131122A1 WO 2022131122 A1 WO2022131122 A1 WO 2022131122A1 JP 2021045313 W JP2021045313 W JP 2021045313W WO 2022131122 A1 WO2022131122 A1 WO 2022131122A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hydrothermal treatment
- transfer device
- gas
- tank
- hydrothermal
- Prior art date
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- 238000010335 hydrothermal treatment Methods 0.000 title claims abstract description 130
- 239000007788 liquid Substances 0.000 claims abstract description 88
- 238000012546 transfer Methods 0.000 claims abstract description 80
- 239000002699 waste material Substances 0.000 claims abstract description 68
- 230000007928 solubilization Effects 0.000 claims abstract description 64
- 238000005063 solubilization Methods 0.000 claims abstract description 64
- 239000005416 organic matter Substances 0.000 claims abstract description 33
- 238000000926 separation method Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000000126 substance Substances 0.000 claims description 17
- 238000011282 treatment Methods 0.000 claims description 14
- 241000233866 Fungi Species 0.000 claims description 11
- 244000005700 microbiome Species 0.000 claims description 11
- 238000010248 power generation Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 2
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 238000001027 hydrothermal synthesis Methods 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 112
- 239000000243 solution Substances 0.000 description 27
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 238000000855 fermentation Methods 0.000 description 10
- 230000004151 fermentation Effects 0.000 description 10
- 238000003756 stirring Methods 0.000 description 9
- 239000010813 municipal solid waste Substances 0.000 description 8
- 239000008186 active pharmaceutical agent Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000010815 organic waste Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000010806 kitchen waste Substances 0.000 description 2
- 239000010871 livestock manure Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000010794 food waste Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- -1 kitchens Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003381 solubilizing effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/60—Biochemical treatment, e.g. by using enzymes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
- C02F11/08—Wet air oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/78—Recycling of wood or furniture waste
Definitions
- the present invention relates to a hydrothermal treatment system that generates gas from organic matter-containing waste.
- Solubilization of kitchen waste (food waste) discharged from households such as urban waste, woody waste such as paper and vegetation, and organic waste such as livestock manure and sludge is hydrothermally reacted with high-temperature and high-pressure steam.
- a liquid (hydroheated liquid) such as a solution or slurry is separated from the hydrothermally treated organic waste (hydroheated product), and the liquid is used to generate gas by microorganisms and fungi, for example, methane fermentation.
- a system has been developed (eg, Patent Documents 1 and 2).
- a screen or a screw press as described in Patent Document 3 can be used in this system.
- organic matter-containing waste collected by garbage collection vehicles and organic matter-containing waste stored in the garbage pits of garbage cleaning plants do not contribute to or contribute to gas generation in addition to organic matter that contributes to gas generation.
- Hard-to-difficult organic substances for example, plastic
- inorganic substances such as metal and glass are not completely removed and remain.
- the ratio of organic matter to inorganic matter contained in the collected or stored organic matter-containing waste, the ratio of organic matter to paper and organic matter, and most of the organic matter that contributes to gas generation is different.
- a predetermined amount of the organic matter-containing waste is discharged for a predetermined fixed time (predetermined).
- the hydrothermal treatment is performed for a certain period of time), and as soon as the predetermined time is completed, the hydrothermal treatment is completed and the hydrothermally treated product is taken out from the hydrothermal treatment apparatus. Therefore, the properties of the hydrothermally treated product to be taken out differ depending on the ratio of each content to the organic matter-containing waste. For example, a sandy or powdery hydrothermally treated product having a low water content may be obtained, or a muddy or liquid hydrothermally treated product having a high water content may be obtained.
- the concentration of fine organic substances contained in the hydrothermal treatment solution is an important factor for increasing the gas generation efficiency.
- the concentration of the organic matter differs greatly between the hydrothermally treated product having a high water content and the hydrothermally treated product having a low water content, it is difficult to stably generate gas in a gas generating device such as a methane fermentation device. ..
- an object of the present invention is to provide a hydrothermal treatment system capable of stably generating gas regardless of the ratio of each content contained in the organic matter-containing waste.
- a hydrothermal treatment apparatus for hydrothermally reacting organic waste, an adjusting tank for humidifying the hydrothermally reacted hydrothermally-reacted product, and a hydrothermally treated product humidified in the adjusting tank are transferred.
- the second transfer device has a concentration of organic substances contained in the hydrothermal solution stored in the solubilization tank for gas generation by microorganisms or fungi.
- concentration of the organic substance is less than the predetermined concentration
- the hydrothermal solution is returned to the adjusting tank, and when the concentration of the organic substance is equal to or higher than the predetermined concentration, the hydrothermal solution is transferred to the gas generator. do.
- gas can be stably generated regardless of the ratio of each content contained in the organic matter-containing waste.
- FIG. 1 is a schematic view showing the hydrothermal treatment system 1 of the present embodiment.
- the hydrothermal treatment system 1 solubilizes organic-containing waste by hydrothermally reacting it with high-temperature and high-pressure steam (hereinafter referred to as "hydrothermal treatment”), and hydro-heat-treated organic-containing waste (hereinafter referred to as “hydrothermal treatment”).
- hydrothermal treatment hydro-heat-treated organic-containing waste
- It is a system that produces gas by microorganisms and fungi using a liquid such as a solution, a mixed solution, or a slurry (hereinafter referred to as "hydrothermal heat treatment solution”) separated from the water.
- the water heat treatment system 1 includes a water heat treatment device 10, an adjusting tank 11, a first transfer device 21, a pressure separation device 12, a solubilization tank 13, a second transfer device 22, and a gas generation device 14. , At least including. Then, all the configurations of the hydrothermal treatment system 1 shown in FIG. 1 will be described in detail below.
- the hydrothermal treatment apparatus 10 is an apparatus for hydrothermally treating organic matter-containing waste.
- Examples of the organic matter-containing waste charged into the hydrothermal treatment apparatus 10 include kitchen waste (swill) discharged from home, wood-based waste, livestock manure, sludge and the like.
- the organic matter-containing waste collected by the garbage truck or the organic matter-containing waste stored in the garbage pit of the garbage cleaning plant may be directly put into the hydrothermal treatment apparatus 10, or the inorganic matter is removed from these organic matter-containing wastes. After that, it may be put into the hydrothermal treatment apparatus 10. From these organic matter-containing wastes, kitchens, papers, and plants containing organic matter suitable for gas generation are selectively taken out, and the taken out kitchens, papers, and plants are put into the hydrothermal treatment apparatus 10.
- the hydrothermal treatment apparatus 10 can hydrothermally treat disposable diapers, which have recently had a problem of disposal in facilities for the elderly and the like.
- the ratio of each content to the predetermined amount of organic-containing waste handled by the hydrothermal treatment apparatus 10 in one hydrothermal treatment is the ratio of each water to be carried out a plurality of times. Even if it differs greatly depending on each organic-containing waste handled by the heat treatment, the gas generation device 14 described later can stably generate gas.
- the hydrothermal treatment device 10 performs hydrothermal treatment for a predetermined time, and the hydrothermally treated product discharged from the hydrothermal treatment apparatus 10 is stored in the adjusting tank 11.
- the adjusting tank 11 is an apparatus that humidifies the hydrothermally treated product discharged from the hydrothermally treated product 10 to adjust the properties of the hydrothermally treated product.
- “humidifying" the hydroheat-treated product includes not only the meaning of moistening the hydro-heat-treated product with water or liquid, but also the meaning of immersing the hydro-heat-treated product in water or liquid. Since the hydrothermal treatment liquid stored in the solubilization tank 13 described later is injected into the adjustment tank 11, the hydrothermal treatment product stored in the adjustment tank 11 is humidified. In addition to the hydrothermal treatment liquid, tap water (not shown) or reused water described later may be appropriately injected into the adjusting tank 11.
- a stirring device may be installed in the adjusting tank 11 to stir and mix the hydrothermally treated product stored in the adjusting tank 11 with the liquid or water to be injected.
- the adjusting tank 11 can adjust the properties of the hydrothermally treated product in a short time. For example, when the hydrothermally treated product stored in the adjusting tank 11 is sandy, the hydrothermally treated product is changed into a slurry in a short time by operating the stirring device while performing the above-mentioned injection or the above-mentioned water injection. be able to.
- the stirring device can be any device as long as it is a device such as air stirring or mechanical stirring that stirs and mixes the hydrothermally treated product stored in the adjusting tank 11 with these liquids or water to be injected or injected. May be.
- the hydrothermal treatment apparatus 10 and the adjusting tank 11 are facilities for hydrothermally treating organic matter-containing waste and humidifying and storing the hydrothermally treated product obtained by hydrothermal treatment, and are the first in the hydrothermal treatment system 1. It is a component of the first equipment 2 that performs step processing. Further, as will be described later, the hydrothermal treatment liquid stored in the first facility 2 is pressurized to separate the hydrothermal treatment liquid (hereinafter referred to as “pressurization separation”), and the hydrothermal treatment liquid obtained by the pressure separation can be used.
- the equipment to be melted is the second equipment 3 that performs the second stage treatment in the hydrothermal treatment system 1. Further, the equipment that generates gas using the hydrothermal treatment liquid solubilized in the second equipment 3 is the third equipment 4 that performs the third stage treatment in the hydrothermal treatment system 1.
- the first transfer device 21 is a device that transfers the hydrothermally treated product humidified in the adjusting tank 11 of the first equipment 2 to the second equipment 3.
- the first equipment 2 and the second equipment 3 are installed close to each other, for example, they are installed on the same or neighboring sites where the distance between the first equipment 2 and the second equipment 3 is less than about 500 m. If so, the first transfer device 21 is connected to the adjusting tank 11 of the first equipment 2 and the pressure separating device 12 of the second equipment 3, and a hydrothermally treated product whose properties have been adjusted in the adjusting tank 11 is added.
- a pipeline equipped with a crushing pump that pumps to the pressure separator 12 is desirable.
- a pipeline is generally composed of a plurality of pipes connected to form one path.
- the hydrothermally treated material stored in the adjusting tank 11 of the first equipment 2 is transferred to the pressure separating device 12 of the second equipment 3 while being crushed by the crushing pump through the pipeline. Since the hydroheat-treated product can be finely divided by the crushing pump when the hydro-heat-treated product is transferred, the load on the pressure separation device 12 (for example, a screw press) described later can be reduced.
- the distance between the two equipments is less than about 500 m. It means that it will be installed on the same or different sites.
- the first transfer device 21 is an automobile equipped with a storage tank or the like (for example, a vacuum car or the like).
- a storage tank or the like for example, a vacuum car or the like.
- the hydrothermally treated material stored in the adjusting tank 11 of the first equipment 2 is loaded on the automobile and transported to the pressure separating device 12 of the second equipment 3, and the transported hydroheated material is pressure-separated by the pressure separating device. Put it in 12.
- the automobile may be a automobile driven by a person, or may be an automatically driven automobile in which a computer such as Artificial Intelligence (so-called AI) controls driving instead of a human.
- the hydrothermal treatment system 1 may be provided with a central control room, and the driving of the automobile may be controlled while a person remotely monitors using a surveillance camera. In this case, if a surveillance camera is installed in the equipment and devices included in the hydrothermal treatment system 1 and the facility, these can be remotely monitored in the central control room, and the operational safety of the hydrothermal treatment system 1 is improved. be able to.
- the hydrothermal treatment system 1 can be configured to control the operation of each of the equipment, devices, and facilities included in the hydrothermal treatment system 1 in the central control room, and the hydrothermal treatment system 1 can be configured by using AI. It is also possible to fully automate the operation of.
- the automobile when two of the first equipment 2, the second equipment 3, and the third equipment 4 are installed in a "distant place", the distance between the two equipments is about 500 m or more. Or it means that it will be installed on a different site.
- the automobile when the term “automobile” is used, the automobile may be a human-driven vehicle or an autonomously driven vehicle.
- the vehicle may be a vehicle in which a person remotely monitors and controls driving.
- the pressure separating device 12 of the second facility 3 pressurizes the hydroheat-treated product transferred from the adjusting tank 11 of the first facility 2 by the first transfer device 21, and pressurizes the hydro-heat-treated liquid and the residue (water from the hydro-heat-treated product to water). It is a device that separates the heat treatment liquid into the one that remains after being separated.
- the hydrothermal treatment liquid is also called a fermentation-suitable product, and the residue is also called a fermentation-unsuitable product.
- the pressure separating device 12 may have a configuration in which the rotary drum screen 12A is arranged in the front stage and the screw press 12B is arranged in the rear stage, for example.
- the rotary drum screen 12A may be, for example, the punching metal drum screen device described in the registration publication of Japanese Patent No. 6384015 of Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd.
- the screw press 12B may be, for example, the dehydration system described in FIG. 13 of the registration publication of Japanese Patent No. 6734496 of Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. Since the pressure separating device 12 affects the recovery rate of the hydrothermally treated liquid and the removal rate of unsuitable fermentation substances depending on the water content and viscosity of the hydrothermally treated product, the opening ratio, the opening ratio, and the screw pitch (screw and discharge port). (Distance with) etc. are set carefully.
- the pressure separating device 12 may change the pressure in the device by, for example, increasing or decreasing the size of the discharge port in response to the change in the properties of the hydrothermally treated product. Further, unlike FIG. 2, the pressure separating device 12 may be configured by a single screw press only.
- the hydrothermally treated product transferred from the adjusting tank 11 of the first facility 2 by the first transfer device 21 is first charged into the rotary drum screen 12A. Then, on the rotary drum screen 12A, a part of the hydrothermal treatment liquid is separated from the hydrothermal treatment product. After that, the hydrothermally treated product discharged from the rotary drum screen 12A is charged into the screw press 12B. Therefore, compared to the case where the rotary drum screen 12A is not arranged in the front stage (when the pressure separating device 12 is a single unit having only a screw press), the screw press 12B in the rear stage is a hydrothermally treated product transferred by the first transfer device 21.
- the hydrothermally treated product which is less than the total amount of the above, is pressurized and separated into the hydrothermally treated liquid and the residue. Therefore, the pressure separating device 12 of FIG. 2 can reduce the power of the screw press 12B (power saving).
- a part of the hydrothermal treatment liquid separated by the rotary drum screen 12A and the hydroheat treatment liquid separated by the screw press 12B are both stored in the solubilization tank 13 of the second facility 3.
- the solubilization tank 13 of the second facility 3 is a device that stores and heats the hydrothermal treatment liquid separated by the pressure separation device 12 to solubilize the hydrothermal treatment liquid.
- the heating temperature can be, for example, about 40 ° C to 60 ° C.
- SS insoluble solids floating in the hydrothermal solution floating in the hydrothermal solution are dissolved in the hydrothermal solution (the solids (hereinafter referred to as “SS”)). It changes to Dissolved Solids (hereinafter referred to as "DS").
- the solubilization tank 13 is a device that reduces the SS of the stored hydrothermal treatment liquid, increases the DS, and promotes acid fermentation. In general, it is desirable that the amount of organic DS in TS is large for gas production by microorganisms and fungi.
- the TS, SS, or DS of the hydrothermal treatment liquid stored in the solubilization tank 13 can be measured by a dedicated measuring device (not shown). Further, in the solubilization tank 13, similarly to the adjustment tank 11, a stirring device may be installed to stir the hydrothermal treatment liquid stored in the solubilization tank 13 to promote the solubilization of the hydrothermal treatment liquid. ..
- the concentration of the organic substance contained in the hydrothermal solution stored in the solubilization tank 13 of the second facility 3 is less than a predetermined concentration (for example, TS is about 10% and DS is about 6%).
- a predetermined concentration for example, TS is about 10% and DS is about 6%.
- the predetermined concentration is ,
- TS may have a concentration of about 10% to 12%
- DS may have a concentration of about 6% to 8%, and the like.
- the second transfer device 22 automatically selects either the adjusting tank 11 or the gas generating device 14 as the transfer destination based on the measurement results of the above-mentioned measuring device, and the hydrothermal treatment liquid stored in the solubilization tank 13. May be configured to be transferred to the selected transfer destination.
- the predetermined concentration is set to a concentration of an organic substance suitable for gas generation by a microorganism or a fungus in the gas generation device 14 described later.
- the pH value (pH value) of the hydrothermal treatment liquid stored in the solubilization tank 13 is less than 7, and it is desirable that the pH value is 5 or less.
- the second transfer device 22 has the adjusting tank 11 and the second facility 3 of the first facility 2 when the first facility 2 and the second facility 3 are installed close to each other.
- a pipeline provided with a pump connected to the solubilization tank 13 and pumping the hydrothermal solution of the solubilization tank 13 to the adjustment tank 11 is desirable.
- the second transfer device 22 is preferably an automobile equipped with a storage tank or the like (for example, a vacuum car or the like). In this case, the hydrothermal treatment liquid is transported from the solubilization tank 13 to the adjustment tank 11 by an automobile. In either case, the hydrothermal treatment liquid is circulated between the first equipment 2 and the second equipment 3 by the second transfer device 22.
- the second transfer device 22 includes the solubilization tank 13 of the second facility 3 and the gas generation device 14 of the third facility 4.
- a pipeline provided with a pump that is connected to the gas generator and pumps the hydrothermal solution of the solubilization tank 13 to the inlet of the gas generator 14 is desirable.
- the second transfer device 22 may be, for example, the solubilization tank 13 of the second equipment 3 and the first equipment.
- a switching device is provided in the middle of the pipeline connecting the adjusting tank 11 of No. 2, and another pipeline branched from the pipeline is connected to the switching device and the input port of the gas generation device 14 of the third equipment 4. It may be configured to be used.
- the solubilization tank 13 of the second equipment 3 and the adjustment tank 11 of the first equipment 2 are used according to the concentration of the organic matter contained in the hydrothermal solution stored in the solubilization tank 13 of the second equipment 3.
- the second transfer device 22 is selectively selected by the switching device so as to transfer the hydrothermal solution stored in the solubilization tank 13 to one of the pipeline connecting the above and the other pipeline. can do.
- the second transfer device 22 is preferably an automobile equipped with a storage tank or the like (for example, a vacuum car or the like).
- the hydrothermal treatment liquid is transported from the solubilization tank 13 to the gas generation device 14 by an automobile, and the hydrothermal treatment liquid is charged into the inlet of the gas generation device 14.
- the second transfer device 22 may be used.
- the transfer of the hydrothermal solution between the first facility 2 and the second facility 3 may be performed by a pipeline, and the transfer of the hydrothermal solution between the second facility 3 and the third facility 4 may be performed by an automobile. That is, the second transfer device 22 may include two types of transfer devices, a pipeline and an automobile. Similarly, when the first equipment 2 and the second equipment 3 are installed far from each other and the second equipment 3 and the third equipment 4 are installed close to each other, the second transfer device 22 may be used.
- the transfer of the hydrothermal solution between the first facility 2 and the second facility 3 may be performed by an automobile, and the transfer of the hydrothermal solution between the second facility 3 and the third facility 4 may be performed by a pipeline. ..
- the second transfer device 22 adjusts the hydrothermal treatment liquid of the first equipment 2 until the concentration of the organic substance contained in the hydrothermal treatment liquid stored in the solubilization tank 13 of the second equipment 3 reaches the above-mentioned predetermined concentration. It will be returned to the tank 11. Therefore, since the hydrothermally treated material stored in the adjusting tank 11 of the first equipment 2 can be humidified, the hydrothermally treated material can be easily transferred by the first transfer device 21, and the pressure separation device 12 of the second equipment 3 can be easily transferred. Power can be reduced.
- the hydrothermal treatment liquid returned from the solubilization tank 13 of the second facility 3 to the adjustment tank 11 of the first facility 2 is heated in the solubilization tank 13, the heated temperature remains or is used. Even if it is cooled a little by natural heat dissipation or the like, it is possible to inject liquid into the adjusting tank 11 while maintaining a temperature higher than normal temperature. In this case, the returned hydrothermal treatment liquid can contribute to the adjustment of the properties of the hydrothermal treatment product by promoting the solubilization of at least a part of the hydrothermal treatment product stored in the adjusting tank 11.
- the hydrothermal treatment system 1 a plurality of hydrothermal treatments are sequentially performed in time, and the ratio of each content to the organic matter-containing waste hydrothermally subjected to by the hydrothermal treatment apparatus 10 of the first facility 2 is Even if the concentration of organic substances contained in the hydrothermal solution obtained by each hydrothermal treatment varies greatly depending on the hydrothermal treatment, the above return causes the hydrothermal treatment between the first facility 2 and the second facility 3.
- the concentration of the organic substance contained in the hydrothermally treated liquid stored in the solubilization tank 13 can be averaged.
- the hydrothermal treatment liquid having the predetermined concentration is transferred to the gas generation device 14 by the second transfer device 22. Therefore, the concentration of the organic matter contained in the hydrothermal treatment liquid charged into the gas generation device 14 is substantially constant and has little variation, and the hydrothermal treatment liquid contains a large amount of organic matter contributing to gas generation. .. Therefore, the gas generator 14 can stably generate gas.
- a general gas generator that uses a hydrothermal solution as a raw material to generate gas by microorganisms and fungi, it is necessary to perform solubilization and acid fermentation inside the device.
- the hydrothermal treatment system 1 when the concentration of the organic substance contained in the hydrothermal treatment liquid stored in the solubilization tank 13 reaches the predetermined concentration, the solubilization and acid fermentation of the gas have already been performed in the solubilization tank 13. It is in a state suitable for generation. Therefore, since the gas generation device 14 can omit the solubilization and acid fermentation performed by the general gas generation device, the gas can be generated at a higher speed than the general gas generation device.
- the gas generation device 14 of the third facility 4 is a device that generates gas by microorganisms and fungi using the hydrothermal treatment liquid stored in the solubilization tank 13 of the second facility 3.
- the gas generation device 14 may be a device that generates gas by microorganisms or fungi using a hydrothermal solution as a raw material, may be a methane fermentation device that produces methane gas by methane fermentation, or may generate a gas such as hydrogen. It may be a device to be used.
- the gas generator 14 heats the hydrothermal treatment liquid to generate gas.
- the hydrothermal treatment system 1 may further include the following devices and facilities.
- the waste liquid treatment device 15 is a device that purifies the waste liquid (for example, digestive liquid) discharged when gas is generated in the gas generation device 14 to generate recycled water.
- the waste liquid treatment device 15 is, for example, a device that performs nitrification and denitrification treatment, that is, biological treatment, on the waste liquid.
- the recycled water generated by purifying the waste liquid of the gas generation device 14 by the waste liquid treatment device 15 can be supplied to the adjusting tank 11 of the first facility 2 through the supply channel 19 formed by the pipeline. Immediately after the start of operation of the hydrothermal treatment system 1, since the hydrothermal treatment liquid is not stored in the solubilization tank 13 of the second facility 3, the hydrothermal treatment system 1 cannot return the hydrothermal treatment liquid to the adjustment tank 11.
- the hydrothermal treatment system 1 can humidify the hydrothermally treated product stored in the adjusting tank 11 by supplying the recycled water from the waste liquid treatment device 15 to the adjusting tank 11. Immediately after the start of the operation of No. 1, the hydrothermally treated material can be smoothly transferred by the first transfer device 21 and the pressure separation device 12 of the second facility 3 can be smoothly operated. When the above-mentioned return is not possible, the hydrothermal treatment system 1 can also inject tap water into the adjusting tank 11 to humidify the hydrothermally treated product. However, in order to improve the cost performance of the hydrothermal treatment system 1, it is desirable to use recycled water instead of tap water.
- the third transfer device 23 is a device that transfers the gas generated by the gas generation device 14 of the third facility 4 to the gas utilization facility 16 described later.
- the third transfer device 23 is connected to the gas generation device 14 and the gas utilization facility 16 and is generated by the gas generation device 14.
- a pipeline that transfers the generated gas to the gas utilization facility 16 is desirable.
- the third transfer device 23 is preferably an automobile (truck) equipped with a loading platform for loading a gas cylinder or an automobile equipped with a gas tank.
- the gas generated by the gas generator 14 can be filled in a gas cylinder or a gas tank, loaded or mounted on an automobile, and transferred to the gas utilization facility 16.
- the gas utilization facility 16 is a facility that utilizes the gas generated by the gas generator 14 of the third facility 4.
- the gas utilization facility 16 is, for example, a power generation plant that generates steam by burning the gas in a boiler to generate steam and turning a steam turbine with the steam to generate electricity.
- the gas utilization facility 16 may be a power plant equipped with a gas turbine, a gas engine, a fuel cell, or the like, or a facility that reforms the gas to generate city gas or the like.
- the gas utilization facility 16 When the gas utilization facility 16 is a power plant equipped with a gas engine, it generally includes a heat recovery device for exhaust gas generated by the gas engine. The heat recovery device can generate hot water from the exhaust gas.
- the gas utilization facility 16 When the gas utilization facility 16 is a power generation plant that generates electricity with a steam turbine, and at least one of the first facility 2 and the second facility 3 and the gas utilization facility 16 are installed close to each other, the gas utilization facility 16 Waste steam, which is high-temperature steam after being used for power generation by the steam turbine of No. 1, can be used in the adjacent first equipment 2 and second equipment 3.
- Waste steam can be transferred to the hydrothermal treatment apparatus 10 of the first equipment 2 and used as high-temperature and high-pressure steam used by the hydrothermal treatment apparatus 10 or as a part thereof.
- the gas utilization facility 16 provided with the steam turbine When the gas utilization facility 16 provided with the steam turbine is installed close to the second facility 3, the gas utilization facility 16 and the second facility 3 are connected by a pipeline and via the pipeline.
- the waste water vapor can be transferred to the solubilization tank 13 of the second facility 3 and used for heating the hydrothermal treatment liquid stored in the solubilization tank 13.
- the gas utilization facility 16 equipped with the steam turbine is installed close to the third facility 4
- the gas utilization facility 16 and the third facility 4 are connected by a pipeline and via the pipeline.
- the waste steam can be transferred to the gas generator 14 of the third facility 4 and used for heating the hydrothermal treatment liquid stored in the gas generator 14.
- the gas utilization facility 16 equipped with the gas engine when installed close to the second facility 3, the gas utilization facility 16 and the second facility 3 are connected by a pipeline and via the pipeline.
- the hot water generated by the heat recovery device can be transferred to the solubilization tank 13 of the second equipment 3 and used for heating the hydrothermal treatment liquid stored in the solubilization tank 13.
- the gas utilization facility 16 and the third facility 4 are connected by a pipeline, and the hot water is transferred to the gas generator 14 of the third facility 4 via the pipeline and stored in the gas generator 14. It can be used for heating the hydrothermal treatment liquid.
- the gas utilization facility 16 when the gas utilization facility 16 is equipped with a steam turbine, the waste steam discharged from the steam turbine can be used as a heat source in the hydrothermal treatment system 1, and the gas utilization facility 16 is equipped with a gas engine.
- the hot water generated by the heat recovery device can be used in the hydrothermal treatment system 1 as a heat source, the cost performance of the hydrothermal treatment system 1 can be further improved.
- the fourth transfer device 24 is a device that transfers the residue separated by the pressure separation device 12 of the second facility 3 to the waste incinerator 17, which will be described later.
- the fourth transfer device 24 is a waste discharge port of the pressure separation device 12 and a waste pit of the waste incinerator 17. It is desirable to use a conveyor that is connected to the waste pit and transfers the residue discharged from the pressure separating device 12 to the waste pit.
- the fourth transfer device 24 is preferably an automobile such as a truck or a garbage truck. In this case, the residue discharged from the pressure separating device 12 can be loaded or stored in a truck bed or a garbage collection vehicle and transferred to a waste incinerator 17.
- the waste incinerator 17 is a facility that incinerates waste in an incinerator, and can also incinerate the residue discharged from the pressure separating device 12 of the second facility 3.
- the waste incinerator 17 can generate power by generating high-temperature and high-pressure steam in a boiler by heat generated in an incinerator and turning a steam turbine with the high-temperature and high-pressure steam.
- the high temperature steam after being used for power generation in the steam turbine of the waste incinerator 17 is used.
- a certain waste steam can be used in the adjacent first equipment 2 and second equipment 3.
- waste incineration facility 17 when the waste incineration facility 17 is installed close to the first facility 2, the waste incineration facility 17 and the first facility 2 are connected by a pipeline, and waste steam is connected through the pipeline. Can be transferred to the hydrothermal treatment apparatus 10 of the first equipment 2 and used as high-temperature and high-pressure steam used by the hydrothermal treatment apparatus 10 or as a part thereof.
- the waste incinerator 17 When the waste incinerator 17 is installed close to the second facility 3, the waste incinerator 17 and the second facility 3 are connected by a pipeline, and the waste water vapor is connected through the pipeline. Can be transferred to the solubilization tank 13 of the second facility 3 and used for heating the hydrothermal treatment liquid stored in the solubilization tank 13.
- the waste steam of the waste incinerator 17 can be effectively used in the hydrothermal treatment system 1 as a heat source, the cost performance of the hydrothermal treatment system 1 can be further improved.
- the hydrothermal treatment system 1 is any of three of (1) waste liquid treatment device 15, (2) third transfer device 23 and gas utilization facility 16, (3) fourth transfer device 24 and waste incinerator facility 17. It may be a system that does not have any of them, a system that has only one or two of them, or a system that has all three of them.
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Abstract
Description
水熱処理システム1は、水熱処理装置10と、調整槽11と、第一移送装置21と、加圧分離装置12と、可溶化槽13と、第二移送装置22と、ガス生成装置14とを、少なくとも含んで構成される。
では、図1に示す水熱処理システム1の全ての構成につき、以下に詳述する。
後程明らかになるが、水熱処理システム1においては、水熱処理装置10が1回の水熱処理で取り扱う所定量の有機物含有廃棄物に占める各々の内容物の比率が、複数回実施される各々の水熱処理で取り扱うそれぞれの有機物含有廃棄物ごとに大きく異なっていても、後述のガス生成装置14で安定的にガスを生成することができる。
水熱処理装置10で所定時間の水熱処理が行われ、水熱処理装置10から排出された水熱処理物は、調整槽11に貯留される。
調整槽11には、後述する可溶化槽13に貯留された水熱処理液が注液されるので、調整槽11に貯留された水熱処理物が加湿される。調整槽11には、当該水熱処理液に加え、適宜、水道水(図示省略)や後述の再利用水を注水してもよい。
また、調整槽11に撹拌装置を設置し、調整槽11に貯留された水熱処理物と、注液または注水されるこれらの液または水とを攪拌して混合してもよい。撹拌装置を設置した場合は、調整槽11は、短時間で水熱処理物の性状を調整することができる。例えば、調整槽11に貯留された水熱処理物が砂状であった場合、上記注液または上記注水を行いつつ撹拌装置を動作させることにより、当該水熱処理物を短時間でスラリー状に変化させることができる。
撹拌装置は、空気撹拌や機械撹拌など、調整槽11に貯留された水熱処理物と、注液または注水されるこれらの液または水とを攪拌して混合する装置であれば、いかような装置であってもよい。
また、後述するが、第一設備2で貯留された水熱処理物を加圧して水熱処理液を分離(以下「加圧分離」という)し、当該加圧分離により得られた水熱処理液を可溶化する設備は、水熱処理システム1における第二段階の処理を行う第二設備3である。さらに、第二設備3で可溶化された水熱処理液を用いてガス生成する設備は、水熱処理システム1における第三段階の処理を行う第三設備4である。
第一設備2と第二設備3とが互いに近接して設置されている場合、例えば、第一設備2と第二設備3との距離が約500m未満である同一または近隣の敷地に設置されている場合、第一移送装置21は、第一設備2の調整槽11と第二設備3の加圧分離装置12とに接続し、且つ、調整槽11で性状が調整された水熱処理物を加圧分離装置12へ圧送する破砕ポンプを備えたパイプラインが望ましい。パイプラインは、一般的に、一つの経路を形成するよう複数の配管が接続されて構成される。
この場合は、パイプラインを通じて、第一設備2の調整槽11に貯留された水熱処理物を、破砕ポンプにより破砕しながら第二設備3の加圧分離装置12へ移送する。水熱処理物の移送の際に、破砕ポンプで水熱処理物を細かくすることができるので、後述の加圧分離装置12(例えば、スクリュープレス)の負荷を低減できる。
また、水熱処理システム1に中央制御室を設け、監視カメラを利用して人が遠隔監視しながら、自動車の運転を制御してもよい。この場合、水熱処理システム1に含まれる設備、装置、並びに施設に監視カメラを設置すれば、中央制御室でこれらの遠隔監視をすることができ、水熱処理システム1の運転の安全性を向上することができる。
さらに、水熱処理システム1は、中央制御室で、水熱処理システム1に含まれる設備、装置、並びに施設のそれぞれの運転を制御するよう構成することもでき、AIを利用することで水熱処理システム1の運転を全自動化することも可能である。
また、以下、「自動車」という場合には、当該自動車は、人が運転する自動車であっても、当該自動運転の自動車であってもよい。当該自動車は、人が遠隔監視して運転を制御する自動車であってもよい。
加圧分離装置12は、例えば、図2に示すように、前段に回転式ドラムスクリーン12Aを配置し、後段にスクリュープレス12Bを配置した構成とすることができる。回転式ドラムスクリーン12Aは、例えば、三菱重工環境・化学エンジニアリング株式会社の特許第6384015号の登録公報に記載のパンチングメタルドラムスクリーン装置であってもよい。また、スクリュープレス12Bは、例えば、三菱重工環境・化学エンジニアリング株式会社の特許第6734496号の登録公報の図13に記載の脱水システムであってもよい。
加圧分離装置12は、水熱処理物の含水率や粘性等により、水熱処理液の回収率や発酵不適物の除去率に影響があるため、目開きや開口率、スクリューピッチ(スクリューと排出口との距離)などが慎重に設定される。上記特許第6734496号の登録公報の図13に記載の脱水システムは、水熱処理物の性状の変化に対応して目開きを変更するので、加圧分離装置12に好適である。加圧分離装置12は、水熱処理物の性状の変化に対応して、例えば、排出口の大きさを増減させて、装置内の圧力を変更してもよい。
また、加圧分離装置12は、図2と異なり、スクリュープレスのみの単体で構成してもよい。
従って、前段に回転式ドラムスクリーン12Aを配置しない場合(加圧分離装置12がスクリュープレスのみの単体の場合)に比べ、後段のスクリュープレス12Bは、第一移送装置21で移送された水熱処理物の総量よりも減量した水熱処理物を加圧して水熱処理液と残余物に分離する。このため、図2の加圧分離装置12は、スクリュープレス12Bの動力低減(電力の省力化)が可能である。
なお、回転式ドラムスクリーン12Aで分離された一部の水熱処理液と、スクリュープレス12Bで分離された水熱処理液とは、いずれも第二設備3の可溶化槽13に貯留される。
可溶化槽13で水熱処理液を可溶化することで、水熱処理液に浮遊している不溶性の固形物(Suspended Solids、以下「SS」という)が、水熱処理液に溶解している固形物(Dissolved Solids、以下「DS」という)に変化する。このため、可溶化槽13に貯留された水熱処理液に含まれる固形物全体量(Total Solids、以下「TS」という。TS=SS+DS)に占めるSSが減少する。従って、可溶化槽13は、貯留している水熱処理液のSSを減量し、DSを増量し、酸発酵を促進する装置ともいえる。
一般的に、TSにおける有機物のDSの量が多い方が、微生物や菌によるガス生成に望ましい。可溶化槽13に貯留された水熱処理液のTS、SS、またはDSは、専用の測定装置(図示省略)で計測することができる。
また、可溶化槽13には、調整槽11と同様に、撹拌装置を設置して、可溶化槽13に貯留された水熱処理液を攪拌し、水熱処理液の可溶化を促進してもよい。
第二移送装置22は、先述の測定装置の測定結果に基づき、調整槽11とガス生成装置14のいずれか一方を移送先として自動的に選択し、可溶化槽13に貯留された水熱処理液を当該選択した移送先へ移送する構成としてもよい。
なお、当該所定濃度は、後述のガス生成装置14で、微生物または菌によるガス生成に適した有機物の濃度に設定される。当該所定濃度においては、可溶化槽13に貯留された水熱処理液のpH値(ペーハー値)は7未満の酸性となっており、pH値が5以下であることが望ましい。
一方、第一設備2と第二設備3とが互いに遠方に設置されている場合、第二移送装置22は、貯留タンク等を備えた自動車(例えば、バキュームカー等)が望ましい。この場合は、自動車によって可溶化槽13から調整槽11へ水熱処理液を運搬する。
いずれの場合も、第二移送装置22により、水熱処理液は、第一設備2と第二設備3との間を循環することになる。
上述したように、第二設備3の可溶化槽13に貯留された水熱処理液に含まれる有機物の濃度に応じて、第二設備3の可溶化槽13と第一設備2の調整槽11とを接続するパイプラインと、上記別のパイプラインとのいずれか一方で、可溶化槽13に貯留された水熱処理液を移送するよう、第二移送装置22は、切替装置で択一的に選択することができる。
なお、第一設備2と第二設備3とが互いに近接して設置され、且つ、第二設備3と第三設備4とが互いに遠方に設置されている場合、第二移送装置22としては、第一設備2と第二設備3との間の水熱処理液の移送はパイプライン、また、第二設備3と第三設備4との間の水熱処理液の移送は自動車であってもよい。すなわち、第二移送装置22は、パイプラインと自動車の2種類の移送装置を兼ね備えてよい。
同様に、第一設備2と第二設備3とが互いに遠方に設置され、且つ、第二設備3と第三設備4とが互いに近接して設置されている場合、第二移送装置22としては、第一設備2と第二設備3との間の水熱処理液の移送は自動車、また、第二設備3と第三設備4との間の水熱処理液の移送はパイプラインであってもよい。
従って、第一設備2の調整槽11に貯留された水熱処理物を加湿することができるので、第一移送装置21による水熱処理物の移送を容易にし、第二設備3の加圧分離装置12の動力を低減することができる。
この場合、当該返送される水熱処理液は、調整槽11に貯留された水熱処理物の少なくとも一部の可溶化を促進するなどして当該水熱処理物の性状の調整に寄与することができる。
そして、可溶化槽13に貯留された水熱処理液に含まれる有機物の濃度が所定濃度になった場合、当該所定濃度の水熱処理液が第二移送装置22によりガス生成装置14に移送される。このため、ガス生成装置14に投入される水熱処理液に含まれる有機物の濃度は実質的に常に一定でばらつきが少なく、且つ、当該水熱処理液はガス発生に寄与する有機物を多く含有している。従って、ガス生成装置14は安定的にガスを生成することができる。
しかし、水熱処理システム1では、可溶化槽13に貯留された水熱処理液に含まれる有機物の濃度が当該所定濃度になった場合、可溶化槽13において、既に可溶化と酸発酵が当該ガスの生成に適した状態となっている。従って、ガス生成装置14は、一般的なガス生成装置が行う可溶化と酸発酵を省略できるので、当該一般的なガス生成装置と比べて高速にガスを生成することができる。
廃液処理装置15でガス生成装置14の廃液が浄化されて生成された再利用水は、パイプラインで形成された供給路19を通じて第一設備2の調整槽11に供給することができる。
水熱処理システム1の運転開始直後は、第二設備3の可溶化槽13に水熱処理液が貯留されていないため、水熱処理システム1は当該水熱処理液を調整槽11に返送することができず、当該水熱処理液で調整槽11に貯留された水熱処理物を加湿することができない。そこで、この場合に、水熱処理システム1は、再利用水を廃液処理装置15から調整槽11に供給することで、調整槽11に貯留された水熱処理物を加湿することができ、水熱処理システム1の運転開始直後から第一移送装置21による水熱処理物の移送や第二設備3の加圧分離装置12の運転を円滑に行うことができる。
上述の返送ができない場合に、水熱処理システム1は、水道水を調整槽11に注水して水熱処理物を加湿することもできる。しかし、水熱処理システム1のコストパフォーマンスを良好にするために、水道水ではなく再利用水を使用するのが望ましい。
ガス生成装置14とガス利用施設16とが互いに近接して設置されている場合、第三移送装置23は、ガス生成装置14とガス利用施設16とに接続し、且つ、ガス生成装置14で生成したガスをガス利用施設16へ移送するパイプラインが望ましい。
一方、ガス生成装置14とガス利用施設16とが互いに遠方に設置されている場合、第三移送装置23は、ガスボンベを積載する荷台を備えた自動車(トラック)やガスタンクを搭載した自動車が望ましい。この場合は、ガス生成装置14で生成されたガスをガスボンベやガスタンクに充填して自動車に積載または搭載し、ガス利用施設16へ移送することができる。
ガス利用施設16が、ガスエンジンを備えた発電プラントである場合、一般的に、ガスエンジンで生じる排ガスの熱回収装置を備えている。当該熱回収装置は、当該排ガスから温水を生成することができる。
例えば、蒸気タービンを備えたガス利用施設16が、第一設備2に近接して設置されている場合、ガス利用施設16と第一設備2とをパイプラインで接続して、当該パイプラインを介して廃水蒸気を第一設備2の水熱処理装置10に移送し、水熱処理装置10が使用する高温高圧の水蒸気として又はその一部として利用することができる。
また、蒸気タービンを備えたガス利用施設16が、第二設備3に近接して設置されている場合、ガス利用施設16と第二設備3とをパイプラインで接続して、当該パイプラインを介して廃水蒸気を第二設備3の可溶化槽13に移送し、可溶化槽13に貯留された水熱処理液の加温に利用することができる。
さらに、蒸気タービンを備えたガス利用施設16が、第三設備4に近接して設置されている場合、ガス利用施設16と第三設備4とをパイプラインで接続して、当該パイプラインを介して廃水蒸気を第三設備4のガス生成装置14に移送し、ガス生成装置14に貯留された水熱処理液の加温に利用することができる。
第二設備3と廃棄物焼却施設17とが互いに近接して設置されている場合、第四移送装置24は、加圧分離装置12の残余物の排出口と廃棄物焼却施設17のごみピットとに接続し、且つ、加圧分離装置12から排出された残余物をごみピットへ移送するコンベヤが望ましい。
一方、第二設備3と廃棄物焼却施設17とが互いに遠方に設置されている場合、第四移送装置24は、トラックやゴミ収集車などの自動車が望ましい。この場合は、加圧分離装置12から排出された残余物をトラックの荷台やごみ収集車内へ積載または貯留し、廃棄物焼却施設17へ移送することができる。
第一設備2及び第二設備3の少なくとも一方と廃棄物焼却施設17とが互いに近接して設置されている場合、廃棄物焼却施設17の蒸気タービンで発電に利用された後の高温の水蒸気である廃水蒸気を当該近接している第一設備2や第二設備3で利用することができる。
例えば、廃棄物焼却施設17が、第一設備2に近接して設置されている場合、廃棄物焼却施設17と第一設備2とをパイプラインで接続して、当該パイプラインを介して廃水蒸気を第一設備2の水熱処理装置10に移送し、水熱処理装置10が使用する高温高圧の水蒸気として又はその一部として利用することができる。また、廃棄物焼却施設17が、第二設備3に近接して設置されている場合、廃棄物焼却施設17と第二設備3とをパイプラインで接続して、当該パイプラインを介して廃水蒸気を第二設備3の可溶化槽13に移送し、可溶化槽13に貯留された水熱処理液の加温に利用することができる。
このように、廃棄物焼却施設17の廃水蒸気を熱源として水熱処理システム1内で有効に利用できるため、水熱処理システム1のコストパフォーマンスをさらに向上することができる。
2 第一設備
3 第二設備
4 第三設備
10 水熱処理装置
11 調整槽
12 加圧分離装置
12A 回転式ドラムスクリーン
12B スクリュープレス
13 可溶化槽
14 ガス生成装置
15 廃液処理装置
16 ガス利用施設
17 廃棄物焼却施設
19 供給路
21 第一移送装置
22 第二移送装置
23 第三移送装置
24 第四移送装置
Claims (8)
- 有機物含有廃棄物を水熱反応させる水熱処理装置と、
前記水熱反応された水熱処理物を加湿する調整槽と、
前記調整槽で加湿された水熱処理物を移送する第一移送装置と、
前記第一移送装置で移送された水熱処理物を加圧して水熱処理液と残余物とに分離する加圧分離装置と、
前記加圧分離装置で分離された水熱処理液を貯留して加温する可溶化槽と、
前記可溶化槽で加温され且つ可溶化された水熱処理液を前記調整槽に返送する第二移送装置と、
前記可溶化槽に貯留された水熱処理液を用いてガスを生成するガス生成装置と
を有し、
前記第二移送装置は、前記可溶化槽に貯留された水熱処理液に含まれる有機物の濃度が微生物または菌によるガス生成に適した有機物の濃度である所定濃度未満の場合に、前記調整槽に前記水熱処理液を返送し、前記有機物の濃度が前記所定濃度以上の場合に、前記ガス生成装置に前記水熱処理液を移送する水熱処理システム。 - 前記ガス生成装置で排出された廃液から再利用水を生成する廃液処理装置をさらに有し、
前記廃液処理装置で生成された再利用水を前記調整槽に供給する請求項1に記載の水熱処理システム。 - 前記ガス生成装置で生成されたガスを移送する第三移送装置と、
前記第三移送装置で移送されたガスを利用するガス利用施設と
をさらに有する請求項2に記載の水熱処理システム。 - 前記加圧分離装置で分離された残余物を移送する第四移送装置と、
前記第四移送装置で移送された残余物を焼却する廃棄物焼却施設と
をさらに有する請求項3に記載の水熱処理システム。 - 前記ガス利用施設及び前記廃棄物焼却施設の少なくとも一方は蒸気タービンを備え、
前記蒸気タービンで発電に利用された水蒸気を、前記水熱処理装置及び前記可溶化槽の少なくとも一方に供給する請求項4に記載の水熱処理システム。 - 前記水熱処理装置及び前記調整槽と、前記加圧分離装置及び前記可溶化槽とが、近接して設置されている場合、前記第一移送装置は破砕ポンプを備えたパイプラインであり、前記第二移送装置はポンプを備えたパイプラインであり、
前記水熱処理装置及び前記調整槽と、前記加圧分離装置及び前記可溶化槽とが、互いに遠方に設置されている場合、前記第一移送装置及び前記第二移送装置は、いずれも自動車である請求項5に記載の水熱処理システム。 - 前記ガス生成装置と前記ガス利用施設とが、近接して設置されている場合、前記第三移送装置はパイプラインであり、
前記ガス生成装置と前記ガス利用施設とが、互いに遠方に設置されている場合、前記第三移送装置は自動車であり、
前記廃棄物焼却施設と、前記加圧分離装置及び前記可溶化槽とが、近接して設置されている場合、前記第四移送装置はコンベヤであり、
前記廃棄物焼却施設と、前記加圧分離装置及び前記可溶化槽とが、互いに遠方に設置されている場合、前記第四移送装置は自動車である請求項6に記載の水熱処理システム。 - 前記加圧分離装置は、
前段に回転式ドラムスクリーン及び後段にスクリュープレスを備え、
前記回転式ドラムスクリーンで分離される水熱処理液と、前記スクリュープレスで分離される水熱処理液とが、前記可溶化槽に貯留される請求項1から請求項7のいずれか一項に記載の水熱処理システム。
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