JP2010236367A - Steam turbine generator set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize a steam turbine generator set using steam of which temperature is 650°C or higher with a relatively simple structure and to improve power generation efficiency by increasing temperature of steam. <P>SOLUTION: This steam turbine generator set includes: a boiler in which steam of which temperature is 650°C or higher is generated from a superheater, a first reheater and a second reheater respectively; a super high pressure turbine driven by a super high temperature steam supplied from the superheater; a first high temperature reheating turbine driven by first high temperature reheated steam supplied from the first reheater and disposed on a shaft different from the super high pressure turbine; and a second high temperature reheating turbine driven by second high temperature reheated steam supplied from the second reheater. The super high pressure turbine, a high pressure turbine, a middle pressure turbine, and a low pressure turbine are composed on one shaft, and the first and the second high temperature reheating turbine are disposed on another shaft. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a steam turbine power generation facility including a steam turbine, and more particularly to a steam turbine power generation facility in which steam supplied to a steam turbine is heated.

  Of the steam turbine power generation equipment which is a typical thermal power generation equipment, each component constituting the steam turbine is conventionally configured to be supplied with steam having a temperature of 600 ° C. or lower. For example, a rotor of a turbine, Ferritic heat-resistant steels that are excellent in manufacturability and economy have been used for main members exposed to high temperatures such as turbine blades.

  In recent years, thermal power generation facilities have been actively promoted with the background of environmental conservation, and steam turbines using high-temperature steam at a temperature of about 600 ° C. are being operated. In such a turbine, due to the high temperature of the steam, some parts are superior in high temperature characteristics because they cannot satisfy the requirements for the properties of conventionally used ferritic heat resistant steels. Austenitic heat-resistant steel is used.

  However, the use of austenitic heat resistant steel increases the manufacturing cost of the equipment. In addition, austenitic heat-resistant steel has a lower thermal conductivity than ferritic heat-resistant steel, and has a larger coefficient of linear expansion, so there is a problem that thermal stress is likely to occur during load changes such as when the plant is started or when the plant is stopped. is there.

  In order to further increase the efficiency of the steam turbine power generation facility, it is desired to raise the steam temperature to 650 ° C. or higher. However, the temperature is higher than that of a steam turbine using steam having a temperature of about 600 ° C. In a steam turbine using steam at a temperature of ℃ or higher, not only austenitic heat-resistant steel is used for more members, but also for members whose temperature is higher than the application limit of austenitic heat-resistant steel, It is necessary to use a Ni-based alloy having higher high-temperature strength.

  With regard to such steam turbine power generation equipment in which steam is heated, it is conceivable to use a steam turbine in which austenitic heat-resistant steel or Ni-base alloy is applied to the main members such as the rotor and turbine blades of the turbine. However, since these austenitic heat-resistant steels and Ni-based alloys have a larger linear expansion coefficient than conventional ferritic heat-resistant steels, in a steam turbine in which the steam conditions at the outlet are the same as before, all members are When using austenitic heat-resistant steel or Ni-based alloy, there are the following problems.

  In other words, a gland seal structure such as a labyrinth structure is applied to the gland seal portion provided to prevent steam leakage at both ends of the steam turbine, but all austenitic systems are used for the main members such as the turbine rotor and turbine blades. When heat-resisting steel or Ni-based alloy is applied, the difference in thermal expansion between the casing, which is the stationary part of the ground seal part on the turbine outlet side, and the rotor, which is the rotating part, increases, which increases the amount of ground steam leakage and increases steam turbine power generation. Equipment performance will be degraded. Therefore, in order to prevent such performance degradation, when using steam having a temperature of 650 ° C. or higher in a steam turbine, it is possible to use austenitic heat-resisting steel or Ni-based alloy limited to a portion exposed to high-temperature steam. Proposed.

  About configuring such a steam turbine power generation facility using steam at a temperature of 650 ° C. or more by using austenitic heat-resistant steel or Ni-based alloy in a limited manner, it is disclosed in Patent Document 1, for example. Yes.

JP 2008-151013 A

  However, in a steam turbine power generation facility that uses austenitic heat-resistant steel or Ni-based alloy in a limited manner, such as the above-mentioned Patent Document 1, a different material of austenitic heat-resistant steel or Ni-based alloy and ferritic heat-resistant steel, particularly in a rotor or the like. Welding is required. However, rotors that have been welded with dissimilar materials may have a complicated structure, such as cooling with steam to reduce the thermal stress generated by welding materials with different linear expansion coefficients. It still takes time to verify the reliability of a steam turbine power plant having a complicated structure and put it into practical use.

  In addition, when the steam temperature of an existing steam turbine power generation facility using steam of 600 ° C. or lower is increased to, for example, 650 ° C. or higher, as described above, the austenitic heat resistant steel is limited to a portion exposed to the high temperature steam. When using a steam turbine that uses a Ni-based alloy, it is necessary to replace an existing turbine, and much time and effort are required to update the equipment.

  The present invention has been made to solve such problems, and by realizing a steam turbine power generation facility using steam at 650 ° C. or higher with a relatively simple configuration, power generation efficiency is improved by improving the steam temperature. An object of the present invention is to provide an improved steam turbine power generation facility.

  In order to solve the above problems, a steam turbine power generation facility according to the present invention includes a superheater, a first reheater, and a second reheater, and the superheater, the first reheater, and the second reheater are provided. A boiler for generating steam having a steam temperature of 650 ° C. or more, an ultrahigh-pressure turbine driven by ultrahigh-temperature steam supplied from the superheater, and exhaust steam from the ultrahigh-pressure turbine from the first reheat of the boiler An ultra-high pressure turbine exhaust system for supplying to the reactor; a first high-temperature reheat turbine driven by the first high-temperature reheat steam supplied from the first reheater; and disposed on a separate axis from the ultrahigh pressure turbine; A high-pressure turbine driven by exhaust steam from the first high-temperature reheat turbine and provided coaxially with the ultrahigh-pressure turbine, and exhaust steam from the high-pressure turbine is supplied to the second reheater of the boiler. High pressure turbine exhaust A second high-temperature reheat turbine driven by a second high-temperature reheat steam supplied from the system and the second reheater, and disposed on a separate axis from the ultrahigh-pressure turbine and the high-pressure turbine; An ultra-high pressure turbine driven by exhaust steam from a high-temperature reheat turbine, and an intermediate-pressure turbine disposed coaxially with the ultra-high pressure turbine and the high-pressure turbine, and driven by exhaust steam from the intermediate-pressure turbine, the ultra-high pressure turbine, the high-pressure turbine A low-pressure turbine disposed coaxially with the turbine and the intermediate-pressure turbine, a condenser for condensing exhaust steam from the low-pressure turbine, and condensate condensed in the condenser is pressurized and supplied to the boiler And a water supply system.

  The steam turbine power generation facility of the present invention includes a superheater, a first reheater, and a second reheater, and each of the superheater and the first reheater generates steam having a steam temperature of 650 ° C. or more. The second reheater generates a second reheat steam of less than 650 ° C., an ultrahigh pressure turbine driven by ultrahigh temperature steam supplied from the superheater, and exhaust steam from the ultrahigh pressure turbine Driven by an ultra high pressure turbine exhaust system that supplies the first reheater of the boiler and a first high temperature reheat steam supplied from the first reheater, and is arranged on a separate axis from the ultra high pressure turbine. A first high-temperature reheat turbine; a high-pressure turbine driven by exhaust steam from the first high-temperature reheat turbine; and provided coaxially with the ultrahigh-pressure turbine; and the exhaust steam from the high-pressure turbine is sent to the boiler Second A high-pressure turbine exhaust system that supplies heat to the heater, a medium-pressure turbine that is driven by the second reheat steam supplied from the second reheater, and is arranged coaxially with the ultrahigh-pressure turbine and the high-pressure turbine, A low pressure turbine driven by exhaust steam from an intermediate pressure turbine and disposed coaxially with the ultra high pressure turbine, the high pressure turbine and the intermediate pressure turbine; a condenser for condensing exhaust steam from the low pressure turbine; And a water supply system that boosts the condensate condensed in the condenser and supplies the condensed water to the boiler.

  Furthermore, the steam turbine power generation facility of the present invention includes a superheater, a first reheater, and a second reheater, and each of the superheater and the second reheater generates steam having a steam temperature of 650 ° C. or more. A boiler in which the first reheater generates first reheated steam of less than 650 ° C., an ultrahigh pressure turbine driven by ultrahigh temperature steam supplied from the superheater, and exhaust steam from the ultrahigh pressure turbine. An ultrahigh pressure turbine exhaust system that supplies the first reheater of the boiler, and a high pressure turbine that is driven by the first reheat steam supplied from the first reheater and is coaxial with the ultrahigh pressure turbine. A high-pressure turbine exhaust system that supplies exhaust steam from the high-pressure turbine to the second reheater of the boiler, driven by high-temperature second reheat steam supplied from the second reheater, Ultra high pressure turbid And a second high-temperature reheat turbine disposed on a separate axis from the high-pressure turbine, and driven by exhaust steam from the second high-temperature reheat turbine and disposed coaxially with the ultrahigh-pressure turbine and the high-pressure turbine. A high pressure turbine, a low pressure turbine driven coaxially with the ultra high pressure turbine, the high pressure turbine, and the intermediate pressure turbine, and a recovery turbine that condenses the exhaust steam from the low pressure turbine. A water supply system and a water supply system that boosts the condensate condensed in the condenser and supplies the condensed water to the boiler are provided.

  The steam turbine power generation facility of the present invention includes a superheater and a reheater, and the reheater generates steam having a steam temperature of 650 ° C. or higher and the superheater generates steam having a steam temperature of less than 650 ° C. A boiler, a high-pressure turbine driven by high-pressure steam supplied from the superheater, a high-pressure turbine exhaust system that supplies exhaust steam from the high-pressure turbine to the reheater of the boiler, and supply from the reheater Driven by high-temperature reheat steam, and disposed at a different axis from the high-pressure turbine, and driven by exhaust steam from the high-temperature reheat turbine and medium pressure provided coaxially with the high-pressure turbine. A turbine, a low pressure turbine driven by exhaust steam from the intermediate pressure turbine and disposed coaxially with the high pressure turbine and the intermediate pressure turbine, and the low pressure turbine A condenser for condensing the exhaust vapors from the emission boosts the condensate condensed in the condenser, characterized in that it comprises, a water supply system for supplying to the boiler.

  According to the present invention, the steam turbine of the portion to which steam of 650 ° C. or higher is supplied is separately provided, so that the steam condition applied to the plant is raised with a relatively simple configuration, and the efficiency of the entire plant is increased. Is possible.

System diagram of steam turbine power generation facility according to the first embodiment of the present invention System diagram of steam turbine power generation facility according to a modification of the first embodiment of the present invention System diagram of a steam turbine power generation facility according to a second embodiment of the present invention System diagram of a steam turbine power generation facility according to a second embodiment of the present invention System diagram of a steam turbine power generation facility according to a third embodiment of the present invention

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a system diagram of a steam turbine power generation facility according to a first embodiment of the present invention. This embodiment shows a case where the present invention is applied to a two-stage reheat type steam turbine power generation facility.

  As shown in FIG. 1, in the steam turbine power generation facility according to the present embodiment, an ultrahigh pressure turbine 1, a high pressure turbine 2, an intermediate pressure turbine 3, and a low pressure turbine 4 are coaxially connected to a generator 5 and have one axis. Forming.

  Further, a first high-temperature reheat turbine 7 provided on a shaft different from the shaft composed of the ultrahigh-pressure turbine 1, the high-pressure turbine 2, the intermediate-pressure turbine 3, the low-pressure turbine 4 and the generator 5; The first high-temperature reheat turbine includes a second high-temperature reheat turbine 9 provided on a separate shaft. Generators 8 and 10 are connected to the first high-temperature reheat turbine 7 and the second high-temperature reheat turbine 9, respectively.

  Here, the ultra-high pressure turbine 1, the first high-temperature reheat turbine 7 and the second high-temperature reheat turbine 9 are made of austenitic heat-resistant steel or Ni-based alloy so as to be compatible with high-temperature steam. The shaft is not made of dissimilar material welding and is made of a single material having high heat resistance.

  Furthermore, the steam turbine power generation facility according to the present embodiment is provided with a boiler 6 as a facility for generating steam. Inside the boiler 6, a superheater 61 that generates ultra-high temperature steam of 650 ° C. or higher and high-temperature reheat steam (high-temperature first reheat steam, high-temperature second reheat steam) of 650 ° C. or more are similarly generated. A first reheater 62 and a second reheater 63 are provided.

  In FIG. 1, reference numeral 11 denotes a condenser that condenses steam from the low-pressure turbine 4 to condense, reference numeral 12 denotes a condensate pump, reference numeral 13 denotes a ground steam condenser, reference numeral 14 denotes a low-pressure water heater, 15 is a deaerator, 16 is a feed water pump, 17 is a high pressure feed water heater, 18 is an ultra high pressure turbine exhaust system that guides exhaust from the ultra high pressure turbine 1, and 19 is a high pressure turbine exhaust system that guides exhaust from the high pressure turbine 2. .

  The operation of the steam turbine power generation facility according to the present embodiment having such a configuration will be described below.

  The ultra-high temperature steam of 650 ° C. or higher generated in the superheater 61 of the boiler 6 is introduced into the ultra-high pressure turbine 1, and the ultra-high pressure turbine 1 is driven by the ultra-high temperature steam. The exhaust steam exhausted through work in the ultrahigh pressure turbine 1 is sent to the first reheater 62 of the boiler 6 via the ultrahigh pressure turbine exhaust system 18. Here, the exhaust steam from the ultra high pressure turbine 1 is designed so that the temperature thereof becomes the maximum steam temperature (for example, about 600 ° C.) in the conventional steam turbine power generation equipment.

  The steam reheated by the first reheater of the boiler 6 becomes a first high-temperature reheat steam at 650 ° C. or higher, and is introduced into the first high-temperature reheat turbine 7 that is separate from the ultrahigh-pressure turbine 1 (separate shaft). Is done. The first high-temperature reheat turbine 7 is driven by the first high-temperature reheat steam described above, and the generator 8 connected to the first high-temperature reheat turbine 7 generates electric power.

  The steam that has worked in the first high-temperature reheat turbine 7 becomes exhaust steam having a temperature of the high-pressure main steam (for example, 600 ° C. or less) flowing into the high-pressure turbine in the conventional steam turbine, and is introduced into the high-pressure turbine 2. The high pressure turbine 2 is driven. That is, in the present embodiment, the temperature of the exhaust steam of the first high-temperature reheat turbine 7 is made substantially the same as the main steam temperature at the inlet of the high-pressure turbine of the conventional steam turbine power generation facility. It is possible to use a conventionally designed one without major changes.

  The high-pressure exhaust steam discharged by performing work in the high-pressure turbine 2 is guided to the second reheater 63 of the boiler 6 via the high-pressure turbine exhaust system 19. The high-pressure exhaust steam is reheated again by the second reheater 63 of the boiler 6 to the second high-temperature reheat steam at 650 ° C. or higher. The second high-temperature reheat steam from the second reheater 63 is supplied to the second high-temperature reheat turbine 9.

  The second high-temperature reheat turbine 9 is driven by the second high-temperature reheat steam generated in the second reheater 63, and thereby the generator 10 connected to the second high-temperature reheat turbine 9 generates power.

  The steam that has worked in the second high-temperature reheat turbine 9 becomes exhaust steam having a temperature (for example, 600 ° C. or less) of the reheat steam that flows into the intermediate pressure turbine in the conventional steam turbine. It is introduced and drives the intermediate pressure turbine 3. That is, in the present embodiment, the temperature of the exhaust steam of the second high-temperature reheat turbine 9 is made substantially the same as the temperature of the reheat steam at the intermediate pressure turbine inlet of the conventional steam turbine power generation facility. As the turbine 3, a conventionally designed one can be used without largely changing.

  The steam that has driven the medium-pressure turbine 3 by working in the intermediate-pressure turbine 3 is exhausted from the intermediate-pressure turbine 3 and guided to the low-pressure turbine 4, and further flows through the low-pressure turbine 4 while performing work. The low-pressure turbine 4 is driven.

  In this embodiment, the ultrahigh pressure turbine 1, the high pressure turbine 2, the intermediate pressure turbine 3, the low pressure turbine 4 and the generator 5 are coupled to one shaft, and the ultra high pressure turbine 1, the high pressure turbine 2 are combined as described above. The generator 5 generates electric power by driving the intermediate pressure turbine 3 and the low pressure turbine 4.

  The exhaust steam exhausted from the low-pressure turbine 4 is guided to the condenser 11. In the condenser 11, the led exhaust steam is cooled and condensed, and becomes condensate. Condensate condensed in the condenser 11 is guided to a low-pressure feed water heater 14 through a condensate pump 12 and a ground steam condenser 13.

  The low-pressure feed water heater 14 includes a plurality of feed water heaters (not shown), and extracted steam extracted from an intermediate stage of the low-pressure turbine 4 is guided to each of the feed water heaters as a heating medium. And the condensate led to the feed water heater of the low-pressure feed water heater 14 via the condensate pump 12 and the ground steam condenser 13 exchanges heat with these extracted steams, and the temperature rises.

  The condensate whose temperature has been raised by the low-pressure feed water heater 14 is then led to the deaerator 15. A part of the exhaust steam of the intermediate pressure turbine 3 is led to the deaerator 15 as heating steam, and the non-condensable gas contained in the condensate is brought into direct contact with the condensate in the deaerator 15. Extracted and degassed (heated degassed).

  The condensate deaerated by the deaerator 15 is supplied to the feed water pump 16 where it is pressurized and supplied. The water supply boosted by the water supply pump 16 is guided to the high-pressure water heater 17.

  The high-pressure feed water heater 17 includes a plurality of feed water heaters (not shown), and each of the feed water heaters includes, as a heating medium, extracted steam from an intermediate stage of the intermediate-pressure turbine 3, extracted steam from an intermediate stage of the high-pressure turbine 2, A part of the exhaust steam of the high-pressure turbine 2 and the exhaust steam of the ultrahigh-pressure turbine 1 are respectively introduced. And the feed water led from the feed water pump 16 to the feed water heater of the high pressure feed water heater 17 exchanges heat with these extracted steam and exhaust steam, and the temperature rises further.

  The feed water heated by the high-pressure feed water heater 17 is led again to the boiler 6, evaporates through a not-shown economizer, drum and evaporator, and then led again to the superheater 61.

  As described above, in this embodiment, in particular, the rotor (shaft) member of the ultrahigh pressure turbine 1, the first high temperature reheat turbine 7 and the second high temperature reheat turbine 9 to which ultra high temperature steam of 650 ° C. or higher is supplied. As a single material, an austenitic heat-resistant steel or Ni-based alloy corresponding to high-temperature steam is applied. Therefore, dissimilar material welding, which is disadvantageous in terms of technical problems and reliability, is adopted in the parts exposed to the super high temperature steam of the super high pressure turbine 1, the first high temperature reheat turbine 7, and the second high temperature reheat turbine 9. There is no need.

  Further, high-temperature steam such as the superheater 61, the first reheater 62, the second reheater 63, the ultrahigh pressure turbine 1, the first high temperature reheat turbine 7, and the second high temperature reheat turbine 9 of the boiler 6 is generated. The parts other than the part to be introduced can be used without greatly changing the configuration of the conventional steam turbine power generation facility, so the efficiency of increasing the temperature of the existing steam turbine power generation facility is relatively easily performed. be able to.

  Furthermore, the super high pressure turbine 1, the first high-temperature reheat turbine 7 and the second high-temperature reheat turbine 9 to which austenitic heat-resisting steel or Ni-based alloy is applied are provided separately, and the temperature of the exhaust steam is also the same as that of the conventional steam. The maximum temperature is about 600 ° C. which is the maximum temperature of the turbine. As a result, the difference in thermal expansion between the casing serving as a stationary part and the rotor serving as the rotating part in the ground seal part of the ultrahigh-pressure turbine 1, the first high-temperature reheat turbine 7, and the second high-temperature reheat turbine 9 is compared with the conventional one. It can be suppressed to the same level. Therefore, it is possible to suppress the amount of steam leakage from the ground portion in the super high pressure turbine 1, the first high temperature reheat turbine 7, and the second high temperature reheat turbine 9, and the super high pressure turbine 1, the first high temperature reheat turbine 7, and The loss of each of the second high-temperature reheat turbines 9 can also be suppressed, and a highly efficient steam turbine power generation facility as a whole can be provided.

  In the present embodiment, the exhaust steam temperature of the first high-temperature reheat turbine 7 and the second high-temperature reheat turbine 9 is designed to be about 600 ° C., so that the rotors of the high-pressure turbine 2 and the intermediate-pressure turbine 3 ( Conventionally used ferritic heat resistant steel can be used as the material of the shaft). Further, if the exhaust steam temperature of the first high-temperature reheat turbine 7 or the second high-temperature reheat turbine 9 is about 550 ° C., a cheaper ferritic heat-resistant steel can be used for the high-pressure turbine 2 or the intermediate-pressure turbine 3. It can be selected as the material of the rotor (shaft), and the cost advantage can be increased.

  FIG. 2 is a system diagram of a steam turbine power generation facility according to a modification of the above-described first embodiment. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment shown in FIG. 1, the first high-temperature reheat turbine 7 and the second high-temperature reheat turbine 9 are provided on separate shafts. However, as shown in FIG. The heat turbine 7 and the second high-temperature reheat turbine 9 may be connected, and one generator 8 may be connected to the two first high-temperature reheat turbines 7 and the second high-temperature reheat turbine 9.

  Even with such a configuration, the same effect as that of the first embodiment shown in FIG. 1 is obtained, and the generator 8 connected to the first high-temperature reheat turbine 7 and the second high-temperature reheat turbine 9 is provided. Since it can be one, the cost of the whole equipment can be suppressed. Further, it is possible to reduce the labor required for the installation work and maintenance of the generator.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4 show system diagrams of the steam turbine power generation facility according to the second embodiment. 3 and 4, the same constituent elements as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, only one of the first reheater 62 and the second reheater 63 of the boiler 6 in the first embodiment is configured to generate high-temperature reheat steam at 650 ° C. or higher. Is.

  That is, as shown in FIG. 3, in the boiler 6 of the steam turbine power plant according to the present embodiment, the first reheater 62 generates high-temperature reheat steam at 650 ° C. or higher, and the second reheater. 63 is configured to generate reheated steam at about 600 ° C. or lower as in the conventional steam turbine power plant. In the configuration shown in FIG. 3, one high-temperature reheat turbine 71 is provided on a shaft different from the shaft composed of the ultrahigh-pressure turbine 1, the high-pressure turbine 2, the intermediate-pressure turbine 3, the low-pressure turbine 4, and the generator 5. It has been. Here, the high-temperature reheat turbine 71 is made of austenitic heat-resistant steel or Ni-based alloy so that it can cope with high-temperature steam. In particular, the rotor (shaft) does not employ dissimilar material welding and has high heat resistance. It is composed of a single material.

  In the configuration of FIG. 3, the high-temperature reheat steam at 650 ° C. or higher from the first reheater 62 is supplied to the high-temperature reheat turbine 71 to drive the high-temperature reheat turbine 71. The steam that has worked in the high-temperature reheat turbine 71 becomes exhaust steam having a temperature of the high-pressure main steam (for example, 600 ° C. or less) that flows into the high-pressure turbine in the conventional steam turbine, and is introduced into the high-pressure turbine 2. The high pressure turbine 2 is driven.

  The high-pressure exhaust steam discharged by performing work in the high-pressure turbine 2 is guided to the second reheater 63 of the boiler 6 via the high-pressure turbine exhaust system 19. The high-pressure exhaust steam is reheated at a temperature of about 600 ° C. or less in the second reheater 63 of the boiler 6 as in the conventional steam turbine power plant, and is supplied to the intermediate pressure turbine 3.

  In the configuration shown in FIG. 4, in the boiler 6 of the steam turbine power plant, the first reheater 62 generates reheat steam of about 600 ° C. or less as in the conventional steam turbine power plant, The 2 reheater 63 is configured to generate high temperature reheat steam at 650 ° C. or higher. One high-temperature reheat turbine 91 is provided on a shaft different from the shaft composed of the ultrahigh-pressure turbine 1, the high-pressure turbine 2, the intermediate-pressure turbine 3, the low-pressure turbine 4, and the generator 5. Here, the high-temperature reheat turbine 91 is made of austenitic heat-resistant steel or Ni-based alloy so as to be compatible with high-temperature steam. In particular, the rotor (shaft) does not employ dissimilar material welding and has high heat resistance. It is composed of a single material.

  That is, in the configuration of FIG. 4, reheat steam of about 600 ° C. or less, similar to the conventional steam turbine power plant, from the first reheater 62 is directly supplied to the high pressure turbine 2 to drive the high pressure turbine 2. To do.

  The high-pressure exhaust steam discharged by performing work in the high-pressure turbine 2 is guided to the second reheater 63 of the boiler 6 via the high-pressure turbine exhaust system 19. The high-pressure exhaust steam is reheated to high-temperature reheat steam at 650 ° C. or higher in the second reheater 63 of the boiler 6. The high-temperature reheat steam generated at the second reheater 63 at 650 ° C. or higher is supplied to the high-temperature reheat turbine 91 to drive the high-temperature reheat turbine 91. The steam that has worked in the high-temperature reheat turbine 73 becomes exhaust steam at the temperature of high-pressure main steam (for example, 600 ° C. or less) that flows into the intermediate-pressure turbine in the conventional steam turbine, and is introduced into the intermediate-pressure turbine 3. The intermediate pressure turbine 3 is driven.

  Thus, any one of the plurality of reheaters is used as a reheater that generates high-temperature reheat steam at 650 ° C. or higher, and a turbine to which the high-temperature reheat steam from the reheater is supplied is separately installed at a high temperature. Even with the configuration of the reheat turbine, the same effects as those of the first embodiment can be achieved.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a system diagram of a steam turbine power generation facility according to the third embodiment of the present invention. In FIG. 5, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals, and the detailed description thereof is omitted.

  In the first and second embodiments, the present invention is applied to a so-called two-stage reheat steam turbine plant in which the boiler 6 has two reheaters 62 and 63 in addition to a superheater 61 that generates main steam. In contrast, in the third embodiment of the present invention shown in FIG. 5, a so-called one-stage reheat type having a boiler provided with one reheater in addition to a superheater that generates main steam. The present invention relates to a case where the present invention is applied to a steam turbine power plant.

  That is, as shown in FIG. 5, the boiler 6 includes one reheater 64 in addition to the superheater 61 that generates main steam. Here, in this Embodiment, the superheater 61 is comprised so that the main steam of about 600 degrees C or less similar to the conventional steam turbine power plant may be generated. The reheater 64 is configured to reheat the exhaust steam from the high-pressure turbine 2 into high-temperature reheat steam at 650 ° C. or higher.

  In the present embodiment shown in FIG. 5, the high-pressure turbine 2, the intermediate-pressure turbine 3, and the low-pressure turbine 4 are coupled coaxially, and their shafts (rotors) are connected to the generator 5. Further, a high-temperature reheat turbine 92 is provided as a shaft (rotor) different from the shafts (rotors) of the high-pressure turbine 2, the intermediate-pressure turbine 3, the low-pressure turbine 4, and the generator 5 that are coaxially connected in this way. ing. Here, the high-temperature reheat turbine 92 is made of austenitic heat-resistant steel or Ni-based alloy so that it can cope with high-temperature steam. In particular, the rotor (shaft) does not employ dissimilar material welding and has high heat resistance. It is composed of a single material.

  Further, in the present embodiment, the exhaust steam and extracted steam of the high pressure turbine 2 and the extracted steam of the intermediate pressure turbine 3 are supplied as heating media to the respective feed water heaters (not shown) of the high pressure feed water heater 17. ing.

  The operation of the steam turbine power generation facility of the present embodiment having such a configuration will be described below.

  In the superheater 61 of the boiler 6, main steam of about 600 ° C. or less is generated as in the conventional steam turbine power plant. The main steam generated in the superheater 61 is introduced into the high-pressure turbine 2 and drives the high-pressure turbine 2.

  The high-pressure exhaust steam discharged by performing work in the high-pressure turbine 2 is guided to the reheater 64 of the boiler 6 via the high-pressure turbine exhaust system 19. The high-pressure exhaust steam is reheated to high-temperature reheat steam at 650 ° C. or higher in the reheater 64 of the boiler 6. The high temperature reheat steam from the reheater 64 is supplied to the high temperature reheat turbine 92.

  The high-temperature reheat turbine 92 is driven by the high-temperature reheat steam generated by the reheater 64, and thereby the generator 10 connected to the high-temperature reheat turbine 92 generates power.

  The steam that has worked in the high-temperature reheat turbine 92 becomes exhaust steam having a temperature of reheat steam (for example, 600 ° C. or less) that flows into the intermediate pressure turbine in the conventional steam turbine, and is introduced into the intermediate pressure turbine 3. The intermediate pressure turbine 3 is driven. That is, in the present embodiment, the temperature of the exhaust steam of the high-temperature reheat turbine 92 is made substantially the same as the temperature of the reheat steam at the inlet of the intermediate pressure turbine of the conventional steam turbine power generation facility. As for, it is possible to use a conventionally designed one without major change.

  The steam that has driven the medium-pressure turbine 3 by working in the intermediate-pressure turbine 3 is exhausted from the intermediate-pressure turbine 3 and guided to the low-pressure turbine 4, and further flows through the low-pressure turbine 4 while performing work. The low-pressure turbine 4 is driven.

  In this embodiment, the high-pressure turbine 2, the intermediate-pressure turbine 3, the low-pressure turbine 4, and the generator 5 are coupled to one shaft, and the super-high-pressure turbine 1, the high-pressure turbine 2, and the intermediate-pressure turbine 3 are combined as described above. When the low-pressure turbine 4 is driven, the generator 5 generates electric power.

  The exhaust steam exhausted from the low-pressure turbine 4 is guided to the condenser 11. In the condenser 11, the led exhaust steam is cooled and condensed, and becomes condensate. Condensate condensed in the condenser 11 is guided to a low-pressure feed water heater 14 through a condensate pump 12 and a ground steam condenser 13.

  Even with such a configuration, it is possible to obtain the same operational effects as those of the first embodiment. In particular, according to the present embodiment, the reheat steam generated by the reheater 64 of the boiler 6 is heated to 650 ° C. or higher, and the separate high temperature reheat turbine 92 and the generator 8 are installed. With a relatively simple modification, it is possible to increase the efficiency of the entire steam turbine power generation facility by increasing the temperature.

DESCRIPTION OF SYMBOLS 1 ... Super high pressure turbine 2 ... High pressure turbine 3 ... Medium pressure turbine 4 ... Low pressure turbine 5, 8, 10 ... Generator 6 ... Boiler 7 ... 1st high temperature reheat turbine 9 ... 2nd high temperature reheat turbine 11 ... Condenser DESCRIPTION OF SYMBOLS 12 ... Condensate pump 13 ... Grand steam condenser 14 ... Low pressure feed heater 15 ... Deaerator 16 ... Feed water pump 17 ... High pressure feed heater 18 ... Super high pressure turbine exhaust system 19 ... High pressure turbine exhaust system 61 ... Superheater 62 ... 1st reheater 63 ... 2nd reheater 64 ... Reheater 71, 91, 92 ... High temperature reheat turbine

Claims (5)

A boiler comprising a superheater, a first reheater and a second reheater, wherein the superheater, the first reheater and the second reheater each generate steam having a steam temperature of 650 ° C. or more;
An ultra high pressure turbine driven by ultra high temperature steam supplied from the superheater;
An ultra high pressure turbine exhaust system for supplying exhaust steam from the ultra high pressure turbine to the first reheater of the boiler;
A first high-temperature reheat turbine driven by a first high-temperature reheat steam supplied from the first reheater and disposed on a separate axis from the ultrahigh-pressure turbine;
A high pressure turbine driven by exhaust steam from the first high temperature reheat turbine and provided coaxially with the ultra high pressure turbine;
A high pressure turbine exhaust system for supplying exhaust steam from the high pressure turbine to the second reheater of the boiler;
A second high-temperature reheat turbine driven by a second high-temperature reheat steam supplied from the second reheater and disposed on a separate axis from the ultrahigh-pressure turbine and the high-pressure turbine;
An intermediate pressure turbine driven by exhaust steam from the second high temperature reheat turbine and disposed coaxially with the ultra high pressure turbine and the high pressure turbine;
A low pressure turbine driven by exhaust steam from the intermediate pressure turbine and disposed coaxially with the ultra high pressure turbine, the high pressure turbine and the intermediate pressure turbine;
A condenser for condensing exhaust steam from the low-pressure turbine;
A water supply system for boosting the condensate condensed in the condenser and supplying it to the boiler;
A steam turbine power generation facility comprising:   The steam turbine power generation facility according to claim 1, wherein the first high-temperature reheat turbine and the second high-temperature reheat turbine are arranged coaxially. A superheater, a first reheater, and a second reheater, each of the superheater and the first reheater generates steam having a steam temperature of 650 ° C. or more, and the second reheater is less than 650 ° C. A boiler for generating the second reheat steam of
An ultra high pressure turbine driven by ultra high temperature steam supplied from the superheater;
An ultra high pressure turbine exhaust system for supplying exhaust steam from the ultra high pressure turbine to the first reheater of the boiler;
A first high-temperature reheat turbine driven by a first high-temperature reheat steam supplied from the first reheater and disposed on a separate axis from the ultrahigh-pressure turbine;
A high pressure turbine driven by exhaust steam from the first high temperature reheat turbine and provided coaxially with the ultra high pressure turbine;
A high pressure turbine exhaust system for supplying exhaust steam from the high pressure turbine to the second reheater of the boiler;
An intermediate pressure turbine driven by a second reheat steam supplied from the second reheater and disposed coaxially with the ultra high pressure turbine and the high pressure turbine;
A low pressure turbine driven by exhaust steam from the intermediate pressure turbine and disposed coaxially with the ultra high pressure turbine, the high pressure turbine and the intermediate pressure turbine;
A condenser for condensing exhaust steam from the low-pressure turbine;
A water supply system for boosting the condensate condensed in the condenser and supplying it to the boiler;
A steam turbine power generation facility comprising: A superheater, a first reheater, and a second reheater, each of the superheater and the second reheater generates steam having a steam temperature of 650 ° C. or more, and the first reheater is less than 650 ° C. A boiler for generating the first reheat steam of
An ultra high pressure turbine driven by ultra high temperature steam supplied from the superheater;
An ultra high pressure turbine exhaust system for supplying exhaust steam from the ultra high pressure turbine to the first reheater of the boiler;
A high pressure turbine driven by the first reheat steam supplied from the first reheater and provided coaxially with the ultra high pressure turbine;
A high pressure turbine exhaust system for supplying exhaust steam from the high pressure turbine to the second reheater of the boiler;
A second high-temperature reheat turbine driven by the high-temperature second reheat steam supplied from the second reheater and disposed on a separate axis from the ultrahigh-pressure turbine and the high-pressure turbine;
An intermediate pressure turbine driven by exhaust steam from the second high temperature reheat turbine and disposed coaxially with the ultra high pressure turbine and the high pressure turbine;
A low pressure turbine driven by exhaust steam from the intermediate pressure turbine and disposed coaxially with the ultra high pressure turbine, the high pressure turbine and the intermediate pressure turbine;
A condenser for condensing exhaust steam from the low-pressure turbine;
A water supply system for boosting the condensate condensed in the condenser and supplying it to the boiler;
A steam turbine power generation facility comprising: A boiler comprising a superheater and a reheater, wherein the reheater generates steam having a steam temperature of 650 ° C or higher, and the superheater generates steam having a steam temperature of less than 650 ° C;
A high-pressure turbine driven by high-pressure steam supplied from the superheater;
A high pressure turbine exhaust system for supplying exhaust steam from the high pressure turbine to the reheater of the boiler;
A high temperature reheat turbine driven by high temperature reheat steam supplied from the reheater and disposed on a separate axis from the high pressure turbine;
An intermediate pressure turbine driven by exhaust steam from the high temperature reheat turbine and provided coaxially with the high pressure turbine;
A low pressure turbine driven by exhaust steam from the intermediate pressure turbine and disposed coaxially with the high pressure turbine and the intermediate pressure turbine;
A condenser for condensing exhaust steam from the low-pressure turbine;
A water supply system for boosting the condensate condensed in the condenser and supplying it to the boiler;
A steam turbine power generation facility comprising:

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