JPH1130413A - Recycling plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost recycling plant by a method wherein when drain is concentrated through freezing and concentration, clean ice generated in an ice making process generates a cold heat and a cold heat storage heat, a drain amount is decreased, and a refuse disposing plant having a proper scale corresponding to a generating district where refuse and drain are generated. SOLUTION: A recycling plant comprises an incineration boiler to generate steam by burning refuse, a steam turbine rotated by steam, a refuse incineration.generation device 2 having a generator driven by rotation of the steam turbine, further ice making apparatus 13 to freeze drain and separate the ice into an ice crystal 30 and concentrated drain, a drain freezing concentrating device having a heat storage tank 14 to store ice crystals as a cold heat, and a dehydrating device 15 to effect dehydration treatment of concentrated drain. Combustible refuse and dehydration-treated concentrated drain are burnt and treated by an incinerating boiler. A power, a hot heat, and a cold heat generated from the ice crystal 30 are reduced and fed as energy to a waste generating district and discharge of waste to environment is reduced to approximately zero.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recycling plant, and more particularly to waste (combustible waste and wastewater).
To treat and recycle such waste,
The present invention relates to a recycling plant that returns almost no emissions from the urban area to the environment by returning it to the urban area.

[0002]

2. Description of the Related Art Combustible waste discharged from urban areas,
For waste such as garbage and wastewater, a waste treatment plant including waste treatment power generation and wastewater treatment at the city and town level is set up, and this is set up as a recycling plant. In addition to reducing the cold heat, the purified water was discharged into rivers or the sea. To treat sludge contained in garbage and wastewater, sludge is settled, the sediment is filtered with a screen, a dewatered cake is formed through a belt press, and the dewatered cake is transferred to a refuse incineration boiler. Incineration, and then turning the steam turbine to generate electricity.

[0003]

The above-mentioned conventional recycling plant of this type has the following problems. In other words, if a recycling plant is set up for each city or town and performs waste treatment, power generation, wastewater treatment, etc., large-scale production will be performed in accordance with the amount of waste discharged and energy demand in the city or town where waste is generated. In order to return energy to the area by supplying hot and cold heat to the area,
Significant investment is required for infrastructure development. Vigorous,
The running cost of this recycling plant was also high, and it was completely unprofitable to actually operate the recycling plant as a business.

Further, in order to perform the wastewater treatment, as described above, a device such as a sludge sedimentation tank, a filter, and a belt press is required. In addition, since the amount of wastewater is large, it is inevitable to increase the size of the device. In other words, a wide area pipe laying for supplying heat to the area basically uses a road network. For this reason, it is necessary to carry out civil engineering and piping construction work without hindering traffic, and this involves a large investment. Recycling plants are also large-scale and require significant investment in securing land.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. Clarified ice and clarified water generated in the ice-making process when freeze-concentrating wastewater by freeze-concentration are used to cool or store cold heat. It is an object of the present invention to provide a low-cost recycling plant by reducing the amount of wastewater, providing a waste treatment plant of an appropriate size corresponding to the area where waste and wastewater are generated.

[0006]

SUMMARY OF THE INVENTION The present invention is a recycling plant, and is configured as follows to solve the above-mentioned technical problems. That is, the recycling plant of the present invention is a refuse incineration / power generation apparatus including an incineration boiler that burns refuse to generate steam, a steam turbine that rotates with the steam, and a generator that is driven by the rotation of the steam turbine. An ice maker that freezes the wastewater to separate it into ice crystals and concentrated wastewater, a heat storage tank that stores the ice crystals as cold heat, and a wastewater freeze-concentrator; and a dewatering device that performs a dewatering treatment on the concentrated wastewater. Combustible waste and dewatered concentrated wastewater are burned in the incineration boiler so that electricity, warm heat, and cold heat obtained from ice crystals can be reduced and supplied to the waste generation area as energy ( Claim 1).

[0007] The recycling plant of the present invention has the essential components as described above, and the energy recycling plant further includes an industrial area, a commercial area, a research school area, and a waste generating area. Office district,
It is provided for each district such as a residential district, and has a scale and / or configuration corresponding to the amount of combustible waste and wastewater discharged (claim 2).

Furthermore, the recycling plant of the present invention
Further, the following configuration is satisfied. That is,
The recycling plant has at least one of a solid fuel conversion device for combustible waste and concentrated waste water subjected to dehydration treatment, a biodegradable plasticization treatment device, and a tap water system (Claim 3). .

[0009] The refuse solid fuel conversion device uses a refuse solid fuel (RDF) by collecting recovered substances such as flammable paper, wood, and plastic (excluding chlorine) that become effective resources.
Equipment such as a compression device and a dryer,
Devices such as a crusher, a sorter, and a granulator are included. In addition, biodegradable plastics are microorganism-based, natural polymer-based, chemically synthesized, and natural-use plastics, and these plastics are decomposed into carbon dioxide and water by bacteria, fungi and algae in nature. The biodegradable plasticizing apparatus includes a fermentation apparatus for producing a raw material polymer for producing such a plastic.

[0010] The recycling plant of the present invention is established even with the following configuration. That is, a system is provided in which the recycling plants are connected to each other by an energy bus, thereby enabling mutual complementation of electric power, cooling, heating, etc. between the recycling plants through the energy bus. ).

[0011]

According to the recycling plant of the present invention, it is constructed in a small area such as a commercial area or a residential area where waste is generated, and combustible waste generated in the area is incinerated by a refuse incineration / power generation device. Incinerate in a boiler. The steam generated by the boiler rotates a steam turbine and drives a generator. In addition, hot water and steam are returned to small-scale districts and used for hot water supply, hot water supply, heating, hot water pools, and the like. Electric power is returned from the generator.

[0012] Wastewater containing garbage and the like is subjected to a freeze-concentrator to produce ice crystals. The obtained ice crystals become clear ice containing only water molecules. Sludge and garbage contained in the wastewater precipitate and become a concentrated solution, which is separated into clear ice and a concentrated solution. The cold heat of the clarified ice is stored and supplied back to the waste generation area for cooling. The concentrated liquid is dehydrated to become a collected substance, sent to a refuse incineration / power generation device, where combustion and power generation are performed in the same manner as combustible refuse, and power, hot water, and steam are reduced and supplied.

[0013] The recycling plant is an industrial district commercial district,
Located in research school districts, residential districts, etc., it has a scale and configuration corresponding to the amount of combustible waste and drainage. When peak loads, load patterns, and the like in each district are different between the recycling plants in each district, power, cooling, heating, and the like can be complemented through an energy bus, and power consumption is leveled.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a schematic configuration diagram of an embodiment shown in the drawings of a recycling plant of the present invention will be described. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, unless otherwise specified. It is only an illustrative example.

FIG. 1 shows a first embodiment of the recycling plant of the present invention.
FIG. 2 is a schematic block diagram of a refuse incineration / power generation apparatus, FIG. 3 is a schematic view of a second embodiment of a recycling plant of the present invention, and FIG.
1 shows an outline of the embodiment.

(First Embodiment) In FIG. 1, a recycling plant according to an embodiment of the present invention is indicated by reference numeral 10, and is disposed in a small district 1 such as a commercial district or a residential district. A scale suitable for the emission amount will be provided. As shown schematically in FIG. 2, the recycling plant 10 is provided with a refuse incineration / power generation device 2 having a structure similar to a normal thermal power generation facility. The refuse incineration / power generation device 2
Has an incineration boiler 3 that incinerates refuse to generate steam, a steam turbine 4 that rotates with the steam, and a generator 5 that is driven by the steam turbine. In addition, 6 is a heater.

Wastewater containing household wastewater and garbage is sent to the drainage tank 7 from the small-scale district 1, and the wastewater is then discharged to the drainage tank 7.
From the wastewater freeze-concentrator 11. The garbage is crushed through a storage tank (not shown) and sent to the storage tank 7 together with the drainage. The drainage freeze concentration device 11 has a refrigerator 12 and an ice maker 13 cooled by the refrigerator 12. For this purpose, the waste water is frozen in the ice maker 13 and separated into clear ice crystals and concentrated waste water. Further, a heat storage tank 14 is provided below the ice maker 13 for receiving ice crystals and storing the ice crystals as cold heat.

Further, the ice maker 13 is connected to a dehydrator (centrifugal separator in this embodiment) 15 through a flow path 17 so that the concentrated wastewater can be dehydrated and separated into recovered substances and impurities. Become. The heat exchanger 8 is located in the flow path 17, the heat exchanger 9 is provided in the heat storage tank 14, and is connected to the intermediate water tank 16. The heat exchanger 8 transmits the cold heat of the concentrated waste water to the water channel 18, and the heat exchanger 9 transmits the cold heat of the heat storage tank 14 to the water channel 18, and the cold heat is supplied to the small-scale district 1 through the water channel 18 as district cooling. It is designed to reduce.

The dewatering device 15 is connected to the refuse incineration / power generation device 2 so that the recovered material obtained by the dewatering device can be incinerated. Further, the dewatering device 15 is connected to a refuse solid fuel conversion device 19 that converts recovered material containing effective resources into refuse solid fuel (RDF), or a biodegradable plasticization process that generates a biodegradable plastic raw material among the recovered material. It is connected to the device 20. The raw materials are transported to other factories to become plastic products.

The refuse solid fuel (RDF) can be directly burned by the refuse incineration / power generation device 2, but can be separately used as a fuel for industrial use. Further, the dewatering device 15 is also connected to the impurity incineration treatment device 21 so that harmful impurities obtained separately from the recovered substance from the dehydration device 15 are treated and incinerated. The dewatering device 15 is connected to the intermediate water tank 16 through a flow path 23.
To guide the water separated from the concentrated wastewater to the intermediate water tank 16. In addition, medium water tank 1
From 6, the middle water supply 22 leading to the small-scale district 1 is led. The middle water supply 22 is used for watering plants, washing water for flush toilets, and fire prevention water in the park 25 of the small-scale district 1. Also, rainwater flows into the intermediate water tank 16 as shown in the figure, so that the rainwater can be used as the intermediate water.

Next, the operation of the recycling plant according to the embodiment of the present invention will be described. In a recycling plant 10 constructed in a small district 1 such as a commercial district or a residential district, combustible waste generated in the district is incinerated by the incineration boiler 3 of the refuse incineration / power generation device 2. The steam generated by the boiler 3 is further heated by a superheater 6 to become superheated steam, which rotates a steam turbine 4 and drives a generator 5. The hot water and steam rotating the steam turbine are returned to the small area 1
Used for hot water supply, heating, hot water pools, etc. Further, electric power is returned from the generator 5.

The wastewater containing garbage is discharged to a drain tank 7. Furthermore, the wastewater is drained from the drainage layer 7 to the wastewater freeze concentration device 11.
Is sent to the ice maker 13 and subjected to a freezing process to produce ice crystals. As a result, the obtained ice crystals become clear ice containing only water molecules, and sludge and garbage contained in the wastewater are precipitated and freeze-concentrated to form a concentrated liquid. In this way, the wastewater separates into clear ice and concentrate, while at the same time greatly reducing its volume.

The generated clear ice crystals are collected in a heat storage tank 14, and the concentrated liquid is sent to a centrifugal separator 15 as a dehydrator through a flow path 17. The heat of the concentrated liquid is transferred to the water in the water channel 18 by the heat exchanger 8. The concentrated liquid that has passed through the dehydrator 15 becomes a dehydrated collected substance, and is incinerated with refuse.
The electric power, hot water and steam are supplied to the small-scale district 1 which is sent to the power generation device 2 and burns and generates power in the same manner as combustible waste, and generates waste. In addition, the impurities incinerated by the impurity incinerator 21 are similarly supplied to the small-scale area 1 with electric power, hot water,
Reduces and supplies steam.

The clarified ice is transferred to the water in the water channel 18 through the heat exchanger 9, melts and becomes intermediate water, and is sent to the intermediate water tank 16. The waterway 18 cools down the small area 1
To be able to perform district cooling. As described above, the middle water supply 22 is used for living water such as watering for plants in the park 25 of the small-scale district 1 and washing water for flush toilets, and water for fire prevention.

In the embodiment of the present invention, the refuse incineration / power generation device, the wastewater concentration device, and the dewatering device are used as described above. ) Energy can be returned and supplied to the waste generation area as intermediate water. In addition, the solid fuel (RDF) can be directly processed by a refuse incineration / power generation device or separately used as a fuel for industrial use. The biodegradable plastic raw material also contributes to the recycling of waste as a plastic raw material.

(Second Embodiment) FIG. 3 shows an example of an industrial area which is a small-scale area 1 and a paper mill. Note that, in the present embodiment, the first
Portions equivalent to those of the first embodiment are denoted by the same reference numerals, and description of the configuration and operation is omitted. That is, combustible waste discharged from the paper mill 25 is sent to the waste incineration / power generation device 2 for processing. Further, wastewater containing a large amount of cellulose, which is a main component of paper, is discharged from the paper mill 25 to the drainage tank 7. This waste water is frozen in the ice making device 13 of the waste water freeze concentration device 11 to produce cellulose-free clear ice crystals 30, and at the same time, cellulose is precipitated and concentrated. Recovered cellulose is converted to solid waste fuel or biodegradable plastic, and furthermore, alcohol fermentation raw materials and ethanol /
Generated in fuels such as methanol.

According to the present embodiment, in addition to the effects of the first embodiment, fuel generated as solidified solid fuel or fuel such as ethanol / methanol is directly used by the waste incineration / power generation device 2. It can be incinerated or used as fuel for factories. In addition, the alcoholic fermentation raw material can be used for production of sake, bread, miso, soy sauce, and the like, so that resources can be reused.

(Third Embodiment) A recycling plant 10a to 10d shown in FIG. 4 has an industrial area 1a, a commercial area 1b, and a research school area 1 as illustrated in FIGS.
c, each of which is disposed in each of the districts such as the residential district 1d, and has a scale and configuration corresponding to the amount of combustible waste and wastewater discharged. Further, in each of the districts 1a to 1d, drainage, waste discharge, and reduction supply of hot water, electric power, medium water, and the like are performed between the respective recycling plants 10a to 10d.

Further, each of the recycling plants 10a to 10a
d is connected to an energy bus 26 such as a conduit for easily transporting electric power, cold heat and hot heat, thereby constituting a recycling plant system. For this reason, when the daily peak load, load pattern, and the like of each district are different (for example, in a commercial district, an office district, etc., daytime peaks,
(In a residential area, the nighttime peaks.) Through the energy bus 26, electric power, cold heat, warm heat, and the like can be complemented, and power consumption can be leveled. Energy bus 26
By mutually sending waste that cannot be processed by the recycling plants 10a to 10d in the respective areas through each other and complementing the waste treatment, the size of the recycling plant in each area can be reduced.

The recycling plants 10a to 10d
Between them, an artificial river 27 is excavated. This artificial river 2
Numeral 7 is formed so as to be able to purify by natural powers by bringing water plants to abundance, abolishing concrete revetments and applying masonry to make the river as close as possible to natural rivers.
Then, by discharging used middle water into the artificial river 27, natural purification can be performed. In addition, artificial river 2
7 leads to the main river 28.

[0031]

As described above, according to the recycling plant of the present invention, in addition to the heat and electric power generated by incineration of refuse, the wastewater is treated by a freeze-concentration device, so that the ice making at the time of condensing the wastewater is performed. In the process, cold heat is obtained as clear ice or clear water, and cold heat can be accumulated. Therefore, the cold heat can be returned to the waste generation area for air conditioning. The wastewater freezing and concentrating apparatus can reduce the amount of wastewater, and can reduce the size of equipment required for wastewater treatment.

Further, since electric power, heat and cold can be mutually complemented through the energy bus between the waste generating areas, it is possible to sufficiently cope with a difference in peak energy demand in each section. . For this reason, there is no need for a large-scale recycling plant to cope with peak energy demand in each district, and a small-scale recycling plant is sufficient, so that the infrastructure maintenance costs required for the construction of the recycling plant can be significantly reduced.

In addition, solid fuels and biodegradable plastic raw materials can be obtained, which greatly contributes not only to energy recycling but also to resource recycling of waste.
Emissions of waste from urban areas to the environment can be reduced to almost zero.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a recycling plant according to a first embodiment of the present invention.

FIG. 2 is a schematic block diagram of a refuse incineration / power generation device of the recycling plant of FIG.

FIG. 3 is a schematic view of a second embodiment of the recycling plant of the present invention.

FIG. 4 is a schematic diagram of a recycling plant according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste generation area 1a Industrial area 1b Commercial area 1c Research school area 1d Residential area 2 Garbage incineration / power generation equipment 3 Incineration boiler 4 Steam turbine 5 Generator 10 Cycle plant 11 Wastewater freeze concentration equipment 13 Ice maker 14 Heat storage tank 19 Garbage solid Fuel conversion device 20 Biodegradable plasticization processing device 30 Ice crystal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Yoshida 2-13-1, Botan, Koto-ku, Tokyo Inside the Maekawa Works (72) Inventor Katsumi Fujima 2-3-1 Botan, Koto-ku, Tokyo Stock In company Maekawa Works (72) Inventor Shigeru Sakashita 2-13-1, Botan, Koto-ku, Tokyo Inside Maekawa Works

Claims (4)

[Claims] 1. A waste incineration / power generation device having an incineration boiler that burns waste to generate steam, a steam turbine that rotates with the steam, and a generator that is driven by the rotation of the steam turbine; An ice maker that separates into ice crystals and concentrated waste water, and a heat storage tank that stores the ice crystals as cold heat; and a dewatering device that dewaters the concentrated waste water. A recycle plant characterized in that the treated concentrated wastewater is burned in the incineration boiler, and power, heat, and cold heat obtained from ice crystals can be reduced and supplied to a waste generation area as energy. 2. The energy recycling plant according to claim 1,
It is provided in each of the industrial areas, commercial areas, research school districts, office districts, residential areas, etc., which are waste generating areas, and has a scale and / or configuration corresponding to the amount of combustible waste and wastewater discharged. The recycling plant according to claim 1, wherein 3. The recycling plant according to claim 1, wherein the recycling plant has at least one of a combustible waste and a solid fuel conversion device for a concentrated wastewater subjected to dehydration treatment, a biodegradable plasticization treatment device, and a tap water. Item 3. The recycling plant according to item 1 or 2. 4. The recycling plant is connected to each other by an energy bus, and constitutes a system that enables mutual complementation of electric power, cooling, heating, etc. between the recycling plants through the energy bus. Item 6. The recycling plant according to item 1, 2 or 3.