JPH1080674A - Waste plastic treating and power generating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a highly reliable waste plastic treating and power generating system with high efficiency and at a low cost by generating a high-temp. and high-pressure water by the use of the combustion heat of waste plastic and decomposing a plastic-contg. composite with the water. SOLUTION: The waste plastic 31 is thermally decomposed by the heat source from a heat exchanger 32 in a thermal decomposition device 24, the harmful gas and dust are removed from the generated fluid fuel, the cleaned fuel is burned in a waste heat recovery device 27, and a high-temp. and high-pressure water is generated in a boiler 5. The water is sent to a steam turbine 33 to drive it, and power is generated by a generator 34 coupled with the turbine. Besides, a plastic composite such as waste FRP is mixed with water and slurried, the slurry is made nearly supercritical by a heat exchanger 37, sent to a high-temp. and high-pressure water decomposition device 19 and decomposed into raw material and gas. Consequently, the waste plastic is appropriately treated in accordance with the plastic, and power is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing and power generation system for a plastic composite material such as waste FRP, and more particularly to a processing and power generation system suitable for processing a plastic composite material such as waste FRP utilizing high-temperature and high-pressure water. .

[0002]

2. Description of the Related Art Disposal of plastic composite materials such as waste FRP is difficult because they contain glass fiber as a reinforcing material. However, because of their good functionality, they are mainly used for FRP ships and bathtubs. Continues to increase,
Thirty years of service life have passed since it was put into practical use. As a result, treatment of used plastic composite materials such as waste FRP has become a serious problem.

[0003] The incinerator for waste FRP ships has been developed by the Ministry of Transport, and basic technology for utilizing the combustion heat of waste FRP has been developed.

[0004] On the other hand, research and development of a steam-added pyrolysis method capable of decomposing a plastic composite material such as waste FRP into components and reusing the same have been conducted. Among them, high-temperature high-pressure water, which is particularly high-pressure steam, and especially water-added pyrolysis using supercritical water, various reactions have been carried out because a reaction that does not occur at normal pressure occurs and can be decomposed into plastic raw materials. I have. The former focuses on converting plastic composite materials such as waste FRP into heat, and therefore is energy independent. On the other hand, the latter focuses on returning to the raw material, but does not consider an energy source for industrially producing high-temperature and high-pressure water.

[0005]

The above-mentioned combustion processing technology for plastic composite materials such as waste FRP can obtain heat energy together with the processing of plastic composite materials such as waste FRP. The glass components in the plastic composite material are melted and solidified in a mixed state to become combustion residues, so that it is difficult to reuse them.

On the other hand, the technology of decomposing plastic composite materials such as waste FRP with high-temperature and high-pressure water, particularly supercritical water, can be decomposed into raw materials and obtained in a form that can be reused, but secures a heat source for producing high-temperature and high-pressure water. There is a need. Further, there is a problem that heat recovery and water recovery of high-temperature and high-pressure water after separation of high-temperature and high-pressure water are not considered.

A first object of the present invention is to produce high-temperature and high-pressure water using the combustion heat of ordinary waste plastics other than composite plastics such as waste FRP, and when incinerated, waste FRP in which unburned glass components and the like become residues. It is an object of the present invention to provide a waste plastic processing and power generation system that can appropriately treat composite plastics such as those described above in accordance with the characteristics of the plastics by decomposing the composite plastics with high-temperature and high-pressure water.

A second object of the present invention is to generate electricity by using excess high-temperature and high-pressure water, and to recover heat such as combustion air preheating and feedwater preheating by using high-temperature and high-pressure water after use. An object of the present invention is to provide a plastic processing and power generation system.

A third object of the present invention is to provide a waste plastic processing and power generation system which secures an energy source and utilizes the unused energy of waste plastic including plastic composite materials such as waste FRP. .

[0010]

In order to achieve the above object, a waste plastic processing and power generation system according to the present invention is configured as follows. A high-temperature and high-pressure water splitter that decomposes composite plastics containing glass fiber and other reinforcing materials with high-temperature and high-pressure water, and a pyrolyzer that pyrolyzes ordinary waste plastics. And a removing device for removing dust and dust, a combustor for producing a heat source for producing high-temperature and high-pressure water by burning fluid fuel discharged from the removing device, a boiler for producing high-temperature and high-pressure water by the heat of combustion in the combustor, and a high-temperature and high-pressure It consists of a power generation system using a steam turbine that generates water. Furthermore, a pure water production system is installed, and the high-temperature and high-pressure water passed through the high-temperature and high-pressure water splitter and the decomposed gas-liquid mixture are used as heat sources for the pyrolyzer, and the combustion air preheating, makeup water preheating, feedwater preheating, waste FRP preheating, and steam turbine After heat recovery by reheating or steam turbine bleed heating, etc., the water is recovered by condensing water and made into pure water by a pure water production device to make up water or waste FR.
It is supplied as the mother liquor of the slurry when P is supplied.

A high-temperature and high-pressure water splitter for decomposing a composite plastic containing a reinforcing material such as glass fiber with high-temperature and high-pressure water;
A removing device for removing harmful gases and dust from the fluid fuel generated by the pyrolysis device, a combustor for driving the gas turbine by burning the fluid fuel discharged from the removing device,
Gas turbine power generation system driven by combustion gas from a combustor, boiler for producing high-temperature and high-pressure water by exhaust heat of gas turbine,
It consists of a power generation system using a steam turbine that generates power using high-temperature, high-pressure water. Furthermore, a pure water production system is installed, and the high-temperature and high-pressure water passed through the high-temperature and high-pressure water splitter and the decomposed gas-liquid mixture are used as heat sources for the pyrolyzer, and the combustion air preheating, makeup water preheating, feedwater preheating, waste FRP preheating, and steam turbine After reheating or recovering heat by steam turbine bleed heating or the like, water is recovered by condensing water, purified by a pure water production apparatus, supplied as purified water, and supplied as a mother liquor for slurry when supplying make-up water or waste FRP.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of the present embodiment.

As shown in FIG. 1, the waste FRP high-temperature and high-pressure water cracking treatment and power generation system using waste plastic pyrolysis fluid fuel according to the present embodiment is roughly composed of a steam turbine system and a high-temperature and high-pressure water utilization system. I have.

The system according to the present embodiment employs a waste plastic 3
, A thermal decomposition device 24 for thermally decomposing 1
System 29 that supplies air for thermal decomposition to the thermal decomposition device 2
4, a steam system 28 for supplying pyrolysis steam, a heat exchanger 32 for applying heat for pyrolysis to the pyrolysis device 24, and a harmful gas / dust removal device 25 for removing harmful gases and dust from the pyrolysis device 24. , A combustor for burning fluid fuel generated by the pyrolysis unit 24 and an exhaust heat recovery device 27 in which a device for recovering combustion heat is integrated, the combustion heat is recovered in the waste heat recovery device 27, and A boiler 5 comprising an economizer, an evaporator and a superheater for producing steam, an air preheater 46 installed in the exhaust heat recovery device 27 for preheating the combustion air 1, and a steam driven by steam from the boiler 5 Turbine 33, generator 34 driven by steam turbine 33 to generate power, condenser 12 for condensing steam discharged from the outlet of steam turbine 33, condensing condenser 12, and replenishment from pure water production device 15 water Inflow condensate tank 11, condensate preheater 39 for preheating water from condensate tank 11, and condensate preheated by condensate preheater 39 are injected into deaerator 9 and deaerator 9 for degassing. Steam turbine bleed air 10 from steam turbine 33
Water from the heater 23 and the deaerator 9 for heating the boiler 5
Pump 8, a valve for controlling the amount of high-temperature and high-pressure water extraction 35 of the steam turbine, a valve 13 for releasing the fluctuation of the high-temperature and high-pressure water extraction 35 of the steam turbine 33, and the steam passing through the valve 13 is recovered. Water condenser 1
6, valve 7 for controlling steam used in high-temperature high-pressure water splitter 19, high-temperature high-pressure water splitter 19 using high-temperature high-pressure water extraction 35 of steam turbine 33, and plastic such as waste FRP for high-temperature high-pressure water splitter 19 Composite material 1
A tank 17 for mixing the water from the water tank 50 with a plastic composite material 18 such as waste FRP to supply the slurry 8 to prepare a slurry, and the water and waste FRP etc. Supply pump 4 for supplying mixed slurry of plastic composite material
1, a gas separator 20, which separates a mixture 44 of the high-temperature and high-pressure water and the decomposition product exiting the high-temperature and high-pressure water splitter 19 into gas and solid-liquid,
A heat exchanger 37 for heating a plastic composite material mixture such as waste FRP to be separated with a part of the high-temperature high-pressure water / gas mixture 45 exiting the gas separator 20, and a high-temperature high-pressure water / gas exiting the gas separator 20. A water tank 50 for storing water after a part of the mixture 45 is used as a heat source of the heater 23 and the condensate preheater 39, a pure water producing apparatus 15 for converting the water in the water tank 50 to pure water, and a water of the pure water producing apparatus 15 And a blower 3 for feeding the combustion air 1 into the exhaust heat recovery device 27, and an air preheater 46 for preheating the air coming out of the blower 3. .

The system of the present embodiment configured as described above operates as follows. In the pyrolysis device 24,
The preheating air supplied from the air system 29 and the heat source provided by the heat exchanger 32 with the steam supplied from the steam system 28 being injected maintain the temperature at a maximum of 350 to 450 ° C. to pyrolyze the waste plastic 31. Do. A harmful gas / dust removal device 25 from the fluid fuel generated by this thermal decomposition
And removes corrosive gas such as dust and chlorine gas, burns it as a clean fuel in the exhaust heat recovery device 27, and generates high-temperature high-pressure water in the boiler 5. At this time, as a heat source of the heat exchanger 32 incorporated in the thermal decomposition device 24, high-temperature and high-pressure water passing through the high-temperature and high-pressure water pipe 21 out of high-temperature and high-pressure water mixed with gas and the like that has exited the gas separator 20 is used. After the high-temperature and high-pressure water is used as a heat source, the heater 23, the condensate preheater 39
And the water is returned to the water tank 50.

The combustion air 1 is blown by the blower 3 and heated through an air preheater 46 in the exhaust heat recovery device 27, and then supplied to the exhaust heat recovery device 27 and the pyrolysis device 24, where it is thermally decomposed. It merges with the fluid fuel generated by the device 24 and burns. The boiler 5 is heated by the high-temperature combustion gas generated by this combustion to generate steam. At this time, if the temperature and the pressure are set to a fixed value of 374.1 ° C. and 22.5 MPa or more, steam, which is supercritical water having the property of water because of its high density while being steam, is generated. As previously mentioned,
This high-temperature, high-pressure water (supercritical water) has high reactivity, and has the effect of promoting the decomposition of ordinary water vapor that is not easily decomposed. Here, the pressure is controlled by the water supply pump 8 to the boiler 5 so that the temperature is increased in the boiler 5 to satisfy the critical condition. However, actually, about 550 ° C,
Set to about 25 MPa.

The high-temperature and high-pressure water generated by the boiler 5 is supplied to the steam turbine 33 through the steam line 6 and drives the steam turbine 33. Due to the rotation of the steam turbine 33, the generator 34 linked thereto also generates power. The steam discharged from the steam turbine 33 becomes water in the condenser 12, supplement water is added in the condenser tank 11, and the condensate preheater 3
It is preheated at 9 and enters the deaerator 9. In the deaerator 9, the steam turbine bleed air 10 of the steam turbine 33 is heated and injected by the heater 23 to perform deaeration from condensate. The degassed water is returned to the boiler 5 by the water supply pump 8. Further, while adjusting the amount of the high-temperature and high-pressure water extraction 35 of the steam turbine 33 by the valve 4, the amount of the high-temperature and high-pressure water required in the high-temperature and high-pressure water splitter 19 is adjusted by the valves 7 and 13, and the excess high-temperature and high-pressure water is condensed. The water is condensed by the vessel 16 and enters the condensate tank 11.

On the other hand, the system using high-temperature and high-pressure water operates as follows. A plastic composite material such as waste FRP is mixed with water in a slurry preparation tank 17 of a plastic composite material such as waste FRP to form a slurry, and is sent to a high-temperature high-pressure water splitter 19 by a slurry supply pump 41. At this time, waste FRP
Is supplied in a state close to a supercritical state by a heat exchanger 37. In the high-temperature high-pressure water splitting device 19, the high-temperature high-pressure water extraction 35 of the steam turbine 33 is performed.
(The high-temperature high-pressure water extraction 35 whose extraction point satisfies the high-temperature high-pressure water condition) is introduced, and the plastic composite material slurry such as waste FRP, which is in a state close to a supercritical state in the heat exchanger 37, is removed. Decomposes into raw materials and gas by high-temperature and high-pressure water decomposition.

The mixture of the decomposed substance and the high-temperature and high-pressure water is separated into a gas (hereinafter referred to as mixed high-temperature and high-pressure water such as gas) and a solid-liquid mixture by the gas separator 20. A part of the high-temperature high-pressure water mixed with gas and the like is used as a heat source for raising the temperature of a plastic composite material slurry such as waste FRP to a state close to a supercritical state in the heat exchanger 37, and then heat is taken away. The water is condensed and returned to the water tank 50. In addition, of the mixed high-temperature and high-pressure water such as gas that has exited the gas separator 20, except for the supply of the heat exchanger 37, the heat passes through the high-temperature and high-pressure water pipe 21, and gives heat to the steam turbine extraction air 10 by the heater 23. After the condensate is heated by the water preheater 39, the high-temperature and high-pressure water itself is condensed and the water tank 5
Reflux to 0.

In the water tank 50, the mixed high-temperature and high-pressure water of both systems is merged in a condensed state, and a part is recirculated to the slurry preparation tank 17 of a plastic composite material such as waste FRP as water for slurry preparation. . Tank 1 for preparing plastic composite material slurry such as waste FRP with water in water tank 50
The water other than the water supplied to 7 is sent to the pure water producing apparatus, and after the pure water treatment, supplied to the condensate tank 11 as makeup water by the water supply pump 14 and recirculated.

When waste plastic is used as fuel, if it is burned as it is, chlorine contained in vinyl chloride or the like generates hydrogen chloride which causes boiler tube corrosion, and the steam temperature is reduced.
300 ° C, 30 atm.
Production of high-temperature and high-pressure water becomes difficult. In this embodiment, in order to avoid this, after waste plastic is used, it is thermally decomposed by using heat of high-temperature and high-pressure water to generate low-temperature fluid fuel, and dust and hydrogen chloride are removed from this fluid fuel, and combustion is performed. Of fuel. High-temperature, high-pressure water produced by combustion of this fuel enters the steam turbine and drives the steam turbine. At this time, the high-temperature and high-pressure water extracted from the steam turbine is put into a high-temperature and high-pressure water treatment device, and a plastic composite material such as waste FRP is decomposed into a raw material by utilizing the high reactivity characteristic of the high-temperature and high-pressure water. The high-temperature, high-pressure water after decomposing the plastic composite material such as waste FRP is used as a heat source of a general waste plastic pyrolyzer, preheating of combustion air, feedwater preheating of a steam turbine system, bleed reheat, bleed heating, makeup water, and the like. By recovering and recovering water by preheating the waste FRP and recovering water, not only can waste plastics including plastic composite materials such as waste FRP be efficiently treated to obtain plastic composite material raw materials such as waste FRP but also water. Power can also be obtained. As described above, waste plastic which does not require fuel cost is burned, so that it can be processed at low cost. As a result, water recovery and heat recovery can be performed to increase the heat utilization rate. Also, make-up water is almost unnecessary, and economical operation can be performed because only necessary fuel is used.

FIG. 2 shows a modification of the embodiment shown in FIG. 1, which is a system for decomposing a portion of a pyrolysis device 24 without adding a steam system 28 for pyrolyzing plastic. According to this example, since steam is not used for pyrolysis,
Since a waste plastic can be converted into a clean fuel in a closed loop to process a plastic composite material such as waste FRP, and a power can be generated, a low-cost, environmentally-friendly and resource-saving system can be realized.

FIG. 3 is a modification of FIG. 1 and differs from the embodiment of FIG. 1 in that the gas turbine is driven without directly using the combustion heat of the waste plastic pyrolysis fluid fuel in producing high-temperature and high-pressure water. After generating electricity, high temperature and high pressure water is produced using the exhaust gas. That is, a compressor 52, a gas turbine 49, and a generator motor 48 are added to the configuration shown in FIG. 1, and the combustion air 1 is preheated by the air preheater 46,
After it is compressed by the compressor 52, it is put into the combustor 38 and mixed with a plastic pyrolysis fluid fuel and burned.
The combustion gas after combustion is fed into a gas turbine 49 to drive a generator motor 48 to generate power. At this time, the gas turbine 49
Into the exhaust heat recovery device 27 to generate high-temperature, high-pressure water in the boiler 5.

As described above, after the waste plastic is used, it is thermally decomposed by using the heat of the high-temperature and high-pressure water to generate a low-temperature fluid fuel. I do. Rather than directly producing high-temperature and high-pressure water using the combustion heat of this fuel, first, a gas turbine is driven to generate electricity, and then high-temperature and high-pressure water produced by exhaust heat of the gas turbine is supplied to a steam turbine to produce steam. Drive the turbine. At this time, the high-temperature and high-pressure water extracted from the steam turbine is put into a high-temperature and high-pressure water treatment device, and a plastic composite material such as waste FRP is decomposed into a raw material by utilizing the high reactivity characteristic of the high-temperature and high-pressure water. At this time, the high-temperature and high-pressure water after decomposing the plastic composite material such as waste FRP is supplied to the heat source of the pyrolyzer, the preheating of the combustion air, the feed water preheating of the steam turbine system, the bleed air reheating, the bleed air heating, the makeup water and the waste FRP. The waste plastic containing plastic composite materials such as waste FRP is efficiently treated by collecting water by preheating and condensing water to obtain not only raw materials of plastic composite materials such as waste FRP but also water and electricity. be able to. As described above, since waste plastic which does not require fuel cost is burned, plastic composite materials such as waste FRP can be processed at low cost. As described above, the operation with higher combustion temperature than that of the embodiment of FIG. 1 can be operated more efficiently than the embodiment 3 of FIG.

FIG. 4 shows a modification of the embodiment shown in FIG. 3, in which a part of the thermal decomposition device 24 is used to thermally decompose plastic without using a steam system 28 for decomposition.
According to this example, since steam is not used for thermal decomposition, the waste plastic is converted to clean fuel in a closed loop, and waste F
Since a plastic composite material such as RP can be processed and power can be generated, a low-cost, environment-friendly and resource-saving system can be realized.

[0026]

As described above, according to the present invention, high temperature, which is an effective means for decomposing a composite plastic such as waste FRP or the like which is difficult to generate or burn by the combustion heat of the fuel produced by the thermal decomposition of waste plastic or the combustion fuel of ordinary commercial fuel. Since high-pressure water can be created and the heat and water of the high-temperature and high-pressure water used for the decomposition and the mixture of the composite plastic raw materials can be recovered, a highly efficient, low-cost, and highly reliable waste plastic processing and power generation system can be provided. it can.

In particular, when converting waste plastic into fuel, high-temperature and high-pressure water created by the combustion heat of waste plastic, which is a free fuel, can not only decompose complex plastic waste materials that are difficult to decompose, but also obtain electric power. There is a feature that various waste plastics can be treated organically and at low cost.

In addition, since high-pressure and high-pressure water decomposition and power generation, and waste plastic and a plastic composite material such as waste FRP are organically linked to each other in a mutually complementary manner, the energy and mass of high-temperature and high-pressure water after use can be recovered. It can also generate electricity and clean waste plastic before use.

Further, plastic composite materials such as waste FRP can be reduced to clean raw materials by high-temperature and high-pressure water splitting.
A waste plastic processing and power generation system can be provided.

[Brief description of the drawings]

FIG. 1 is a system diagram of a system according to an embodiment of the present invention.

FIG. 2 is a system diagram of a system according to a modification of FIG. 1;

FIG. 3 is a system diagram of a system according to a modification of FIG. 1;

FIG. 4 is a system diagram of a system according to a modification of FIG. 3;

[Explanation of symbols]

1 ... Combustion air, 2 ... Fuel, 3 ... Blower, 4,7,13
... Valve, 5 ... Boiler, 6 ... Steam line, 8,14 ... Water supply pump, 9 ... Deaerator, 10 ... Steam turbine bleeding, 11
... condensate tank, 12, 16 ... condenser, 15 ... pure water production equipment, 17 ... slurry preparation tank, 18 ... plastic composite material such as waste FRP, 19 ... high temperature and high pressure water decomposition equipment, 20
... gas separator, 21 ... high temperature and high pressure water pipe, 23 ... heater
24: pyrolysis device, 25: harmful gas / dust removal device, 2
7 ... waste heat recovery device, 28 ... steam system, 29 ... air system,
31 ... waste plastic, 32, 37 ... heat exchanger, 33 ...
Steam turbine, 34 ... generator, 35 ... high temperature and high pressure water extraction,
38: Combustor, 39: Condensate preheater, 41: Slurry supply pump, 42: Slurry, 44: High-temperature and high-pressure water / decomposition mixture, 45: High-temperature and high-pressure water / gas mixture, 46: Air preheater, 48: Power generation Electric motor, 49: gas turbine, 50: water tank, 52: compressor.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B09B 3/00 302A (72) Inventor Yukio Ishigaki 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Stock Hitachi, Ltd.Hitachi Plant (72) Inventor Shinya Hayashi 6-38-1, Shinkawa, Mitaka City, Tokyo Inside the Ship Technology Research Institute, Ministry of Transport (72) Kenji Yamane 6-38-1, Shinkawa, Mitaka City, Tokyo Transport (72) Kanemasa Nomaguchi, 4-3-1-1, Higashicho, Hitachi City, Ibaraki Prefecture, Yamazaki Plant, Hitachi Chemical Co., Ltd.

Claims (8)

[Claims] 1. A high-temperature and high-pressure water generator for generating high-temperature and high-pressure water by using heat of combustion of plastic, and a part of high-temperature and high-pressure water generated by the high-temperature and high-pressure water generator using a composite material containing plastic or plastic. And a steam turbine driven by a portion of the high-temperature and high-pressure water generated by the high-temperature and high-pressure water generator. 2. The waste plastic treatment / power generation system according to claim 1, further comprising a heat recovery means for recovering heat from the high temperature / high pressure water used in the high temperature / high pressure water splitting apparatus. 3. A high-temperature and high-pressure water generator for generating high-temperature and high-pressure water using the combustion heat of a liquid fuel obtained by decomposing plastic, and a composite or plastic containing plastic is generated by the high-temperature and high-pressure water generator. And a steam turbine driven by a part of the high-temperature and high-pressure water generated by the high-temperature and high-pressure water generator. Plastic processing and power generation system. 4. The waste plastic processing and power generation system according to claim 3, further comprising heat recovery means for recovering heat from the high-temperature and high-pressure water used in the high-temperature and high-pressure water splitting apparatus. 5. The waste plastic treatment / power generation system according to claim 4, wherein when the plastic is decomposed into a fluid fuel, thermal decomposition or hydrogen decomposition is performed. 6. The waste plastic processing and power generation according to claim 4, wherein the bleed air from the high pressure stage of the steam turbine is reheated with the high temperature and high pressure water used in the high temperature and high pressure water separator and supplied to the low pressure stage of the steam turbine. system. 7. A high-temperature and high-pressure water generating device for generating high-temperature and high-pressure water by the heat of combustion of liquid fuel, and a composite or plastic containing plastic is heated by a part of the high-temperature and high-pressure water generated by the high-temperature and high-pressure water generating device. A high-temperature and high-pressure water splitting device that decomposes,
A steam turbine driven by a part of the high-temperature and high-pressure water generated by the high-temperature and high-pressure water generator, and heat recovery means for recovering heat from the high-temperature and high-pressure water used in the high-temperature and high-pressure water splitter; Waste plastic processing and power generation system. 8. A gas turbine driven by the combustion heat of a liquid fuel obtained by decomposing plastic or by the combustion of a liquid fuel, and a high-temperature and high-pressure water generator for generating high-temperature and high-pressure water from exhaust gas of the gas turbine. A high-temperature and high-pressure water splitting device that thermally decomposes a composite material or plastic containing plastic with a part of the high-temperature and high-pressure water generated by the high-temperature and high-pressure water generating device; and a high-temperature and high-pressure water generated by the high-temperature and high-pressure water generating device. A waste plastic treatment and power generation system comprising a steam turbine driven by a part thereof and recovering heat from high-temperature and high-pressure water used in a high-temperature and high-pressure water splitting device.