JP2020204318A - Trash power generation system and operation method thereof - Google Patents

Abstract

To provide a trash power generation system capable of enhancing trash power generation efficiency while reducing a risk of high-temperature corrosion.SOLUTION: A trash power generation system comprises: a waste heat boiler 1 that uses waste heat from trash incineration to generate saturated steam at a temperature at which high-temperature corrosion does not occur; a high-pressure turbine 2 to which the saturated steam is supplied from the waste heat boiler 1; a dehumidifier 3 that dehumidifies steam exhausted from the high-pressure turbine 2; a reheater 4 that heats steam dehumidified by the dehumidifier 3 with combustion exhaust gas from trash incineration to produce superheated steam at a temperature at which the high-temperature corrosion does not occur; and a low-pressure turbine 5 to which the superheated steam is supplied from the reheater 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a waste power generation system using waste incineration heat and an operation method thereof, and more particularly to a waste power generation system by an exhaust gas reheating method and an operation method thereof.

In the waste power generation system, heat is recovered from the high-temperature combustion exhaust gas generated in the waste incinerator by a waste heat boiler, high-pressure steam generated by the waste heat boiler is sent to a steam turbine, and the steam turbine is rotated to generate power.

In this type of power generation system, in recent years, the temperature and pressure of steam have been increased in order to improve power generation efficiency, and the steam generated in the waste heat boiler is used as superheated steam at high temperature and high pressure (for example, 4 MPaG, 400 ° C.) by a superheater. A waste incineration power generation system for sending to a steam turbine is known (for example, Patent Document 1 etc., hereinafter referred to as "high temperature and high pressure method").

However, in urban waste, chlorine is contained in the waste, and this chlorine is converted to hydrogen chloride in the combustion process of the waste and is contained in the combustion exhaust gas, which causes high-temperature corrosion of the superheater. .. In particular, when the steam temperature is 330 ° C. or higher, the corrosion of the superheated pipe progresses rapidly, depending on the properties of the exhaust gas components.

In order to reduce the risk of such high temperature corrosion and realize highly efficient waste power generation, a boiler heated by the waste heat of waste incineration and a steam turbine power generation device driven by steam from the boiler are provided. The steam turbine power generator recovers the high-pressure turbine to which steam at a temperature that does not cause high-temperature corrosion from the boiler, the medium-low pressure turbine to which the exhaust of the high-pressure turbine is supplied, and the exhaust of the medium-low pressure turbine. The water supply path is provided, the exhaust of the high pressure turbine is supplied to the medium and low pressure turbine via a dehumidifier, and the steam extracted from the medium and low pressure turbine is supplied to the water supply path. A waste power generation system has been proposed in which a device is provided and the steam via the dehumidifier is heated by a reheater to which steam from the boiler is supplied and supplied to the medium-low pressure turbine (Patent Document). 2. Hereinafter referred to as "steam reheating method"). Such a waste power generation system supplies steam at a temperature that does not cause high temperature corrosion from the boiler to the high pressure turbine, so that the risk of high temperature corrosion of the boiler can be eliminated, and the exhaust of the high pressure turbine is medium through the dehumidifier. Since the water supply and heating are performed by the steam supplied to the low-pressure turbine and extracted from the medium- and low-pressure turbine, it is said that high-efficiency power generation can be performed without raising the boiler steam temperature to a high temperature. In this steam reheating method, unlike the high temperature and high pressure method, the heat drop between the high pressure turbine inlet and the medium pressure turbine outlet is covered by the enthalpy increased by the adoption of the dehumidifier and the reheater, and the thermal efficiency is improved.

Japanese Unexamined Patent Publication No. 9-4420 JP-A-2017-155613

The conventional steam reheating method can approach the power generation efficiency of the high temperature and high pressure method while reducing the risk of high temperature corrosion, but further improvement in efficiency is desired.

Therefore, it is a main object of the present invention to provide a waste power generation system and an operation method thereof that can improve the waste power generation efficiency as compared with the above-mentioned conventional steam reheat method while reducing the risk of high-temperature corrosion.

In order to achieve the above object, the first aspect of the waste power generation system according to the present invention is a waste heat boiler that uses waste heat from waste incineration to generate saturated steam at a temperature that does not cause high temperature corrosion, and the waste heat. High-temperature corrosion is caused by heating the high-pressure turbine to which the saturated steam is supplied from the boiler, the dehumidifier that dehumidifies the steam exhausted from the high-pressure turbine, and the steam dehumidified by the dehumidifier with the combustion exhaust gas of waste incineration. It includes a reheater that uses superheated steam at a temperature at which it does not occur, and a low-pressure turbine to which the superheated steam is supplied from the reheater.

In the second aspect of the waste power generation system according to the present invention, the saturated steam can be 250 to 300 ° C.

In the third aspect of the waste power generation system according to the present invention, the superheated steam can be set to 320 ° C. or lower.

In the fourth aspect of the waste power generation system according to the present invention, the reheater can be installed in a region where the temperature of the combustion exhaust gas produced by incineration of waste is in the range of 500 ° C. to 600 ° C.

In a fifth aspect of the waste power generation system according to the present invention, the high-pressure turbine and the low-pressure turbine can be accommodated in a single vehicle interior by partitioning one vehicle interior into a high-pressure portion and a low-pressure portion.

In the sixth aspect of the waste power generation system according to the present invention, the high-pressure turbine and the low-pressure turbine may be provided separately, and a generator may be connected to each of the high-pressure turbine and the low-pressure turbine.

In the seventh aspect of the waste power generation system according to the present invention, a plurality of incinerators for incinerating waste are installed, and the waste heat boiler and the reheater are provided for each of the plurality of incinerators. The saturated steam from the plurality of waste heat boilers provided for each of the incinerators is supplied to one high-pressure turbine, and the saturated steam is supplied to each of the incinerators. The superheated steam from the plurality of reheaters provided may be configured to be supplied to the low pressure turbine.

Further, the operation method of the waste power generation system according to the present invention is the operation method of the waste power generation system according to the seventh aspect, and is among the plurality of the incinerators according to the decrease in the load of the entire waste power generation system. It is characterized by operating some incinerators and shutting down other incinerators.

In one aspect of the operation method of the waste power generation system according to the present invention, the incinerator, the waste heat boiler, and the reheater are each provided, and the load of the entire waste power generation system is 1/2 or less. At this time, the supply of waste to one incinerator is stopped and the other incinerator is operated.

In another aspect of the operation method of the waste power generation system according to the present invention, the incinerator, the waste heat boiler, and the reheater are each provided with three units, and the load of the entire waste power generation system is 2 /. When it is 3 or less and exceeds 1/3, one incinerator is stopped and the other two incinerators are operated, and when the load of the entire waste power generation system is 1/3 or less, two incinerators are stopped. And operate another incinerator.

According to the present invention, the saturated steam dehumidified by the dehumidifier is heated by the combustion exhaust gas of waste incineration to be superheated steam at a temperature that does not cause high temperature corrosion, thereby reducing the risk of high temperature corrosion and the conventional steam. It is possible to provide a waste power generation system having higher efficiency than the reheat method and its operation method.

It is a schematic system diagram which shows 1st Embodiment of the waste power generation system which concerns on this invention. It is a schematic system diagram which shows the 2nd Embodiment of the waste power generation system which concerns on this invention. It is a schematic system diagram which shows the 3rd Embodiment of the waste power generation system which concerns on this invention. It is a schematic system diagram which shows the high temperature and high pressure type waste power generation system as a comparative example. It is a schematic system diagram which shows the steam reheat type waste power generation system as a comparative example. Change in steam state of Example 1 of the waste power generation system according to the present invention, Comparative Example 1 adopting the high temperature and high pressure type waste power generation system, and Comparative Example 2 adopting the steam reheating type waste power generation system. It is a conceptual diagram which shows. It is a schematic system diagram which shows Example 2 of the waste power generation system which concerns on this invention.

Embodiments of the present invention will be described below with reference to the drawings. The same or similar components are designated by the same reference numerals throughout all figures and all embodiments.

FIG. 1 shows a first embodiment of a waste power generation system according to the present invention. In the system diagram shown in FIG. 1, the path shown by the solid line shows the steam path, and the path shown by the broken line shows the water supply path. In the waste power generation system of the first embodiment, referring to FIG. 1, the waste heat boiler 1 that generates saturated steam V1 at a temperature that does not cause high temperature corrosion by utilizing the waste heat of waste incineration and the waste heat boiler 1 High temperature by heating the high pressure turbine 2 to which the saturated steam V1 is supplied, the dehumidifier 3 that dehumidifies the steam V2 exhausted from the high pressure turbine 2, and the steam V3 that is dehumidified by the dehumidifier 3 by the combustion exhaust gas G of waste incineration. It includes a reheater 4 that uses superheated steam V4 at a temperature that does not cause corrosion, and a low-pressure turbine 5 that supplies superheated steam V4 from the reheater 4. The code GE indicates a generator.

The waste heat boiler 1 and the reheater 4 are provided with two units each in the illustrated example, but one or three or more units may be provided. In the illustrated example, the high-pressure turbine 2 and the low-pressure turbine 5 are coaxial, that is, have a common turbine rotor (axle) and are connected to one generator G.

The saturated steam V1 generated in the waste heat boiler 1 is a saturated steam having a temperature that does not cause high-temperature corrosion. Since high-temperature corrosion becomes active above 330 ° C., the saturated steam V1 is set to less than 330 ° C., preferably 320 ° C. or lower. A high-pressure saturated boiler (waste heat boiler) generally used in a waste incineration facility has a saturated steam temperature of 250 ° C. to 300 ° C. Therefore, by supplying the saturated steam V1 generated in the generally used waste heat boiler to the high pressure turbine 2 without passing through the superheater, the saturated steam V1 having a temperature that does not cause high temperature corrosion is supplied to the high pressure turbine 2. Can be supplied. The waste heat boiler 1 includes a type integrated with an incinerator and a separately placed type. In a large-scale stoker-type waste incinerator, an integrated waste heat boiler having a structure in which a water-cooled wall is lowered to the wall surface of the incinerator is common.

In the high-pressure turbine 2, work is performed so that the dryness is lowered to near the lower limit dryness of the steam turbine. Specifically, the dryness of steam at the outlet of the high-pressure turbine 2 is 0.88 or more.

The steam V2 leaving the high-pressure turbine 2 is dehumidified by the dehumidifier 3 and flows to the reheater 4. The dehumidifier 3 can dehumidify the steam V2 exhausted from the high-pressure turbine 2 until it has a dryness of 99% or more, more preferably a dry saturated steam (dryness of 100%). As the dehumidifier 3, for example, a vane separator type dehumidifier can be adopted.

The steam V3 dehumidified by the dehumidifier 3 is heated by the combustion exhaust gas G of waste incineration in the reheater 4, and is regarded as a superheated steam V4 having a temperature that does not cause high-temperature corrosion. Since high-temperature corrosion becomes active above 330 ° C., the superheated steam V4 is set to less than 330 ° C., preferably 320 ° C. or lower.

The reheater 4 can be installed in a region (flue) where the temperature of the combustion exhaust gas G produced by incineration of waste is 500 ° C. to 600 ° C. This is because the temperature of the combustion exhaust gas near the outlet of the incinerator (not shown) is generally about 850 ° C to 1000 ° C, and the minimum temperature of the exhaust gas that provides an efficient heat transfer area is considered to be about 500 ° C. is there. Such a temperature range (500 ° C. to 600 ° C.) is located at an intermediate position of, for example, a waste heat boiler. The combustion exhaust gas of the incinerator is cooled to about 500 to 600 ° C. by the waste heat boiler on the upstream side of the reheater 4 in the process of reaching the inlet of the reheater 4, and further, the waste heat on the downstream side of the reheater 4 is cooled. It is cooled to about 200 ° C by a boiler. The waste incinerator (not shown) can be a conventionally known waste incinerator. Depending on the conditions of the combustion exhaust gas (conditions such as a small amount of corrosive components such as HCl), the reheater 4 can be installed in a temperature range in which the temperature of the combustion exhaust gas G is 700 ° C. to 850 ° C. Such a temperature range (700 ° C. to 850 ° C.) is, for example, in the flue on the high temperature side of the waste heat boiler integrated with the incinerator.

The reheater 4 can be provided with a temperature reducing device (not shown), and the temperature of the superheated steam V3 at the outlet of the reheater 4 is controlled by the temperature reducing device to a temperature at which high temperature corrosion does not occur. Can be done. As the temperature reducing device, a conventionally known temperature reducing device can be adopted. For example, a method of spraying water supply into steam to lower the temperature, or a method of exchanging heat with the water supply to lower the temperature can be adopted. ..

The steam exhausted from the low-pressure turbine 5 is cooled by the condenser 6 and condensed to become saturated water, which is stored in the condenser tank 7. The boiler water collected in the condensate tank 7 is sent to the deaerator 9 by the condensate pump 8, non-condensable gas such as oxygen is removed, and the water is supplied to the waste heat boiler 1 by the water supply pump 10.

A water supply heater 12 can be interposed in the water supply path 11 between the condensate pump 8 and the deaerator 9, and the condensate can be heated by the steam extracted from the low-pressure turbine 5. The steam obtained by heating the condensate with the water supply heater 12 is deprived of heat and condensed into water, which is sent to the condensate tank 7.

The steam exhausted from the high-pressure turbine 2 is supplied to the reheater 4, a part of the steam is supplied to the heat utilization equipment H such as a water heater by valve control, and then sent to the deaerator 9, and the other part is sent. It can be sent to the deaerator 9 as it is.

In the example shown in FIG. 1, a plurality of incinerators (not shown) for incinerating waste are installed (two in the illustrated example), and a waste heat boiler 1 is provided for each of the plurality of incinerators. Saturated steam from a plurality of waste heat boilers 1 (two in the illustrated example) provided for each of the incinerators is combined and supplied to one high-pressure turbine 2. Has been done. Further, a reheater 4 is provided for each of a plurality of waste heat boilers 1 (2 units in the illustrated example), and a plurality of units (2 units in the illustrated example) provided for each of the waste heat boilers 1. The superheated steam from the reheater 4 of the unit) is configured to merge and be supplied to one low-pressure turbine 5. In this way, a plurality of waste heat boilers 1 and reheaters 4 can be connected in parallel to the steam path and the water supply path forming the steam cycle path of the waste power generation system.

FIG. 2 shows a second embodiment of the waste power generation system according to the present invention. In the waste power generation system of the second embodiment, the high-pressure turbine and the low-pressure turbine are in that the high-pressure turbine 2 and the low-pressure turbine 5 are housed in the single vehicle interior by partitioning one vehicle interior into a high-pressure unit and a low-pressure unit. Unlike the first embodiment of the two-chamber structure provided in each of the passenger compartments, the other configurations are the same as those of the first embodiment. In the second embodiment, the cost can be reduced by combining the steam turbines in the motorcycle compartment.

FIG. 3 shows a third embodiment of the waste power generation system according to the present invention. The waste power generation system of the third embodiment is different from the first embodiment and the second embodiment in that the high-pressure turbine 2 and the low-pressure turbine 5 are separately provided and the generator GE is connected to each of them. .. The third embodiment of such a configuration can be applied not only at the time of new construction but also at the time of remodeling. For example, in a backbone improvement work that requires replacement of a boiler, if the existing steam conditions are 3 MPa and 300 ° C class, the existing turbine can be diverted to the low-pressure turbine and only the high-pressure turbine can be newly installed. The waste power generation system of the embodiment can be constructed.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to each example.

As the first embodiment, the waste power generation system adopting the exhaust gas reheating method shown in FIG. 1 is used, as the comparative example 1, the high temperature and high pressure type waste power generation system shown in FIG. 4 is used, and as the comparative example 2, the steam reheating method shown in FIG. 5 is used. It was a waste power generation system. In FIG. 4, reference numeral SH indicates a superheater, and reference numeral T indicates a steam turbine. In FIG. 5, the steam via the dehumidifier 3 is reheated by the reheater 4'to which the steam from the waste heat boiler 1 is supplied and supplied to the low pressure turbine 5.

For a cleaning plant equipped with two stoker-type waste incinerators with a processing capacity of 150 tons / day and a waste calorific value of 12000 kJ / kg, three methods of Example 1 and Comparative Examples 1 and 2 were compared. The waste heat boiler 1 was a natural circulation boiler, and was based on the technical standards for thermal power generation equipment. The dehumidifier 3 of Example 1 and Comparative Example 2 was of a type provided with a vane separator. In Example 1 and Comparative Examples 1 and 2, the condenser 6 was air-cooled, and the saturation temperature was 50 ° C. and the saturated steam pressure was 0.01235 MPa · abs.

Example 1, Comparative Example 1, and Comparative Example 2 each had the conditions shown in Table 1 below.

For Example 1, Comparative Example 1, and Comparative Example 2, the power generation end efficiency η (%) was calculated by the following formula.

η = (3600ΣPn / nGrHu) × 100
In the above formula, power generation output Pn (kW), number of incinerators n, waste rated incineration amount Gr = 6250 (kg / hour / furnace), waste calorific value Hu = 12000 (kJ / kg), and Pn is set for each turbine. Obtained and added. For the power generation output of each generator, the calorific value balance around the turbine was obtained in each of Example 1 and Comparative Examples 1 and 2, and the power generation output based on the conditions was calculated based on the turbine internal efficiency specified by the manufacturer. The dryness of the turbine outlet steam was set to 0.9. The results of the estimated power generation efficiency are shown in Table 2 below.

From the results in Table 2, the power generation end efficiency was Comparative Example 1> Example 1> Comparative Example 2, but the difference between Comparative Example 1 and Example 1 was 0.36%, and Example 1 was compared. It can be seen that the power generation end efficiency comparable to that of Example 1 can be achieved.

FIG. 6 is a conceptual diagram showing changes in steam states of Example 1, Comparative Example 1, and Comparative Example 2. In the conceptual diagram showing the change of state of steam in FIG. 6, the slope of the straight line (change of state of turbine steam) between A _{1 to 3 to} B _{1 to 3 of} Example 1, Comparative Example 1 and Comparative Example 2 respectively. The magnitude is Comparative Example 1> Example 1> Comparative Example 2, and this inclination is directly related to the internal efficiency of the turbine.

In the conceptual diagram showing the change of steam state in FIG. 6, in the wet steam region below the saturation line (dryness 1.00), the wet steam loss of the turbine becomes large and the effective heat head of the turbine becomes small. That is, in Comparative Example 1 in which the ratio of the enthalpy difference to the wet region is small, the internal efficiency of the turbine tends to be high, and the power generation end efficiency tends to be high.

In Example 1, the proportion of the wet region is significantly reduced as compared with Comparative Example 2. This is the reason why the power generation end efficiency of Example 1 is much higher than that of Comparative Example 2, and it is also a factor that approaches the power generation end efficiency of Comparative Example 1.

From the above results, the waste power generation system according to the present invention can improve the waste power generation efficiency as compared with the steam reheat method while reducing the risk of high temperature corrosion.

In the first embodiment, as shown in FIG. 1, two waste heat boilers 1 and two reheaters 4 are provided, but as shown in FIG. 7, one waste heat boiler 1 and one reheater 4 are provided. Example 2 was a waste power generation system having only a configuration, and the power generation efficiency was calculated and compared by changing the load of the entire waste power generation system.

In the first embodiment, there are two waste incinerators, and each furnace is provided with one waste heat boiler. In the second embodiment, there is one waste incinerator. In order to meet the comparison conditions of Examples 1 and 2, the processing capacity of the waste incinerator 1 of Example 2 is double the processing capacity of the waste incinerator 1 of Example 1, and the waste heat boiler of Example 2 is used. The rated output was twice the rated output of one waste heat boiler of Example 1. The comparison results are shown in Table 3 below.

In Table 3, the entire waste power generation system refers to the total of all equipment necessary for power generation, including an incinerator, a waste heat boiler, a reheater, and a steam turbine.

In Table 3, assuming that the operating load of the entire waste power generation system is 100%, the operating load of the incinerator and the waste heat boiler is 100% (rated output) in both Example 1 ₁ and Example 2 ₁ . steam of 100% of the whole system, a gas temperature range 500 to 600 ° C. reheater installation position, reheat after steam superheating degree and power generation efficiency can also example 1 ₁ when the base example 2 ₁ embodiment Same as Example 2 ₁ .

In Table 3, when the operating load of the entire waste generation system is 50%, and the operation load of the second embodiment _2, incinerator and a waste heat boiler is operating at 50% (1/2 of the rated output), Example 1 ₂ in stop one incinerator and waste heat boiler of the two, i.e., to stop the waste feed to 1 furnace incinerator of the two furnace incinerator other 1 furnace By supplying the total amount of waste, the operating load of the waste heat boiler of the other one of the two units becomes 100% (rated output). As a result, the vapor amount of the entire system Example 1 _2, 2 ₂ but both become 50% than that of the overall system operation load of 100%, in Example 2 the temperature Example ₂ in the combustion exhaust gas 1 ₂ compared lowered, although the exhaust gas temperature region of the reheater installation position is keep the example _{1, 2} 500 to 600 ° C., and dropped to example _{2, 2} 450 ° C. to 550 ° C.. Therefore, Example 2 _2, reduces the steam superheat after reheating, have reduced power-generating efficiency in comparison with Example 1 _2.

Reason for a difference in the gas temperature region of the reheater installation position comes out in Example 1 ₂ Example 2 ₂ is as follows. As an example of an operating load of 50% for the entire waste power generation system, a case where the amount of waste is 50% will be described.

In Example 1 _2, the case of supplying the total amount of waste in an incinerator to operate, the operation load of the incinerator and waste heat boiler is 100% flue gas quantity at that time is the rated amount of exhaust gas. The size of the heat transfer surface of the waste heat boiler up to the reheater installation position is designed to be in a predetermined temperature range (rated temperature range) with respect to the rated exhaust gas amount. Therefore, the exhaust gas temperature range at the reheater installation position of the incinerator to be operated is the rated temperature range.

In Example 2 ₂ In contrast, 50% waste amount supplied to the incinerator, namely, the operation load of the incinerator and waste heat boiler is 100% flue gas quantity at that time is 1 rating exhaust gas amount It is / 2. Since the size of the heat transfer surface of the waste heat boiler up to the reheater installation position is designed to be in the specified temperature range (rated temperature range) with respect to the rated exhaust gas amount, it is 1/2 of the combustion exhaust gas. The temperature of the combustion exhaust gas that has passed through the heat transfer surface, which is sufficiently larger than the size of the heat transfer surface required to reduce the amount to the rated temperature range, becomes lower than the rated temperature range.

Table 3 shows an example of one and two waste heat boilers, but the same applies to the case of three waste heat boilers. When the load of the entire system is lower when the number of waste heat boilers is three, that is, when the number of incinerators is three, compared to the waste power generation system of one waste heat boiler (one incinerator). , Power generation efficiency can be high. For example, if the load of the entire system is reduced to 2/3 or less (and more than 1/3), the waste power generation system with 3 waste heat boilers (3 waste incinerators) will be evenly distributed to only 2 incinerators. If the amount of waste equivalent to 100% of each operating load is supplied and operated with only two waste heat boilers, the amount of waste equivalent to 100% of the operating load of one waste heat boiler (one incinerator) is 2 The power generation efficiency is higher than that of the waste power generation system that supplies / 3. In addition, when the load of the entire system is reduced to 1/3 or less, the waste power generation system with 3 waste heat boilers (3 waste incinerators) supplies all the waste to only one incinerator and waste heat. The power generation efficiency is higher when operating with only one boiler than when using a waste power generation system with one waste heat boiler (one incinerator).

When a plurality of incinerators, waste heat boilers, and reheaters are provided in this way, some of the incinerators among the plurality of incinerators are provided according to the decrease in the load of the entire waste power generation system. By operating the incinerator and stopping the operation of other incinerators, the power generation efficiency can be improved as compared with the waste power generation system equipped with only one incinerator and one waste heat boiler.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 Waste heat boiler 2 High pressure turbine 3 Dehumidifier 4, 4'Reheater 5 Low pressure turbine 6 Condenser 7 Condenser tank 8 Condenser pump 9 Deaerator 10 Water supply pump G Combustion exhaust gas GE Generator SH Superheater T Steam Turbine

Claims (10)

A waste heat boiler that uses waste heat from waste incineration to generate saturated steam at a temperature that does not cause high-temperature corrosion, a high-pressure turbine to which the saturated steam is supplied from the waste heat boiler, and steam exhausted from the high-pressure turbine. A dehumidifier that dehumidifies the steam, a reheater that heats the steam dehumidified by the dehumidifier with the combustion exhaust gas from waste incineration to produce superheated steam at a temperature that does not cause high-temperature corrosion, and the superheated steam from the reheater. Is supplied with a low pressure turbine, and is equipped with a waste power generation system. The waste power generation system according to claim 1, wherein the saturated steam is 250 to 300 ° C. The waste power generation system according to claim 1, wherein the superheated steam is 320 ° C. or lower. The waste power generation system according to claim 1, wherein the reheater is installed in a range where the temperature of the exhaust gas burned by waste incineration is in the range of 500 ° C. to 600 ° C. The waste power generation system according to claim 1, wherein the high-pressure turbine and the low-pressure turbine are housed in a motorcycle interior. The waste power generation system according to claim 1, wherein the high-pressure turbine and the low-pressure turbine are separately provided, and a generator is connected to each of the high-pressure turbine and the low-pressure turbine. A plurality of incinerators for incinerating waste were installed, the waste heat boiler and the reheater were provided for each of the plurality of incinerators, and each of the incinerators was provided. The saturated steam from the plurality of waste heat boilers is configured to be supplied to one of the high-pressure turbines, and the reheaters from the plurality of reheaters provided for each of the incinerators. The waste power generation system according to any one of claims 1 to 6, wherein superheated steam is configured to be supplied to one low-pressure turbine. The method for operating a waste power generation system according to claim 7, wherein some of the incinerators among the plurality of incinerators are operated according to a decrease in the load of the entire waste power generation system, and other incinerators are operated. A method of operating the waste power generation system, which comprises stopping the operation of the waste power generation system. Two of the incinerator, the waste heat boiler, and the reheater are provided, and when the load of the entire waste power generation system is 1/2 or less, the waste supply to one incinerator is stopped, and the others. The method for operating a waste power generation system according to claim 8, wherein one of the incinerators is operated. The incinerator, the waste heat boiler, and the reheater are each provided, and when the load of the entire waste power generation system is 2/3 or less and exceeds 1/3, one incinerator is stopped and the other. The present invention is characterized in that the two incinerators of the above are operated, and when the load of the entire waste power generation system is 1/3 or less, the two incinerators are stopped and the other incinerator is operated. The operation method of the waste power generation system according to 8.