초록 ▼

A method for configuring the physical model of a heat recovery steam generator that can estimate the state quantity of generated steam from the state quantity of the exhaust gas to be introduced, and capable of establishing the physical model of a combined cycle power generation facility thereby. Th

A method for configuring the physical model of a heat recovery steam generator that can estimate the state quantity of generated steam from the state quantity of the exhaust gas to be introduced, and capable of establishing the physical model of a combined cycle power generation facility thereby. The optimum values for the flow rates Flp and Fhp, pressures and temperatures Tlp and Thp of the low pressure main steam and high pressure main steam are computed in such a way as to ensure that an objective function E stored in advance will come close to zero.

대표청구항 ▼

What is claimed: 1. A generated steam estimation method for a heat recovery steam generator that estimates a flow rate, pressure and temperature of generated steam from a state quantity of exhaust gas to be introduced from a gas turbine, in which a computing apparatus for estimating the generated s

What is claimed: 1. A generated steam estimation method for a heat recovery steam generator that estimates a flow rate, pressure and temperature of generated steam from a state quantity of exhaust gas to be introduced from a gas turbine, in which a computing apparatus for estimating the generated steam of the heat recovery steam generator is provided with a first computing procedure that performs the steps of: inputting predetermined set values or measured values as flow rate of the exhaust gas; computing pressure of the exhaust gas at an inlet and outlet of a plurality of heat exchangers in response to the flow rate of the exhaust gas; reading an unknown flow rate of the generated steam as a desired initial value; computing a flow rate of water or steam of a plurality of heat exchangers in response to the flow rate of the generated steam; computing a pressure of water or steam at the inlet and outlet of a plurality of the heat exchangers in response to the flow rate of the water or steam of a plurality of the heat exchangers; reading a predetermined set value as a temperature of the exhaust gas at an outlet of a boiler; inputting predetermined set values or measured values as a water temperature at an inlet of the boiler; wherein, as to at least one evaporator in a plurality of the heat exchangers, using a first expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the exhaust gas; and using a second expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the water or the steam; and as to the heat exchanger except the evaporator, using a third expression for computing a heat transfer from a heat transfer coefficient and a heat transfer area of the heat exchanger, temperature of the exhaust gas and the temperature of the water or the steam in addition to the first and second expressions, wherein a temperature of the exhaust gas at the inlet of the plurality of the heat exchangers, the temperature of the water or the steam at the outlet of the plurality of the heat exchangers is computed; and the computing apparatus further being provided with a second computing procedure that performs the steps of: inputting predetermined set values or measured values as the temperature of the exhaust gas at the inlet of the boiler, computing an objective polynomial function having a deviation between a computed value of the exhaust gas at the inlet of the boiler and the predetermined set values or measured values being nominal variables thereof, and another deviation between the heat transfer of the evaporator calculated by using the first expression and second expression and the heat transfer calculated by using the third expression being another nominal variable thereof; and amending the temperature of the exhaust gas at the outlet of the boiler and the flow rate of the generated steam in the first computing procedure in order to allow a value of the objective function to become less than a predetermined threshold value and come closer to zero. 2. A generated steam estimation method for a heat recovery steam generator that estimates a flow rate, pressure and temperature of generated steam from a state quantity of exhaust gas to be introduced from a gas turbine in which a computing apparatus for estimating the generated steam of the heat recovery steam generator is provided with a first computing procedure that performs the steps of: inputting predetermined set values or measured values as a flow rate of the exhaust gas; computing exhaust gas pressure at an inlet and an outlet of a plurality of heat exchangers in response to the flow rate of the exhaust gas; reading an unknown flow rate of the generated steam and spray flow rate of a high pressure spray as desired initial values; computing a flow rate of water or steam of a plurality of the heat exchangers in response to the flow rate of the generated steam and the spray flow rate of the high pressure spray; computing a pressure of water or steam at the inlet and outlet of a plurality of the heat exchangers in response to the flow rate of the water or steam of a plurality of the heat exchangers; reading a predetermined set value as a temperature of the exhaust gas at an outlet of a boiler; and inputting predetermined set values or measured values as a water temperature at an inlet of the boiler; wherein in the first computing procedure, as to at least one evaporator in a plurality of the heat exchangers, using a first expression for computing a heat transfer from a difference of Enthalpy between an inlet and outlet, which is computed by the flow rate, pressure and temperature of the exhaust gas; and using a second expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the water or the steam; and as to the heat exchanger except the evaporator, using a third expression for computing a heat transfer from a heat transfer coefficient and a heat transfer area of the heat exchanger, temperature of the exhaust gas and the temperature of the water or the steam in addition to the first and second expressions, wherein the temperature of the exhaust gas at the inlet of the plurality of the heat exchangers, the temperature of the water or the steam at the outlet of the plurality of the heat exchangers is computed; and the computing apparatus being further provided with a second computing procedure that performs the steps of: inputting predetermined set values or measured values as the temperature of the exhaust gas at the inlet of the boiler, computing an objective polynomial function having a deviation between a computed value of the exhaust gas at the inlet of the boiler and the predetermined set values or measured values as nominal variables thereof, and another deviation between the heat transfer of the evaporator calculated by using the first expression and second expression and the heat transfer calculated by using the third expression as another nominal variable thereof; and amending the temperature of the exhaust gas at the outlet of the boiler and the flow rate of the generated steam in the first computing procedure in order to allow a value of the objective function to become less than a predetermined threshold value and come close to zero, and further amending the spray flow rate of the high pressure spray in the first computing procedure in order to allow a deviation between a computed value of the temperature of the generated steam and a predetermined set value controlled by the high pressure spray to become less than a predetermined threshold value and become closer to zero. 3. A generated steam estimation device for a heat recovery steam generator capable of estimating a flow rate, pressure and temperature of generated steam from a state quantity of exhaust gas to be introduced from a gas turbine in which a computing apparatus for estimating the generated steam of the heat recovery steam generator is provided with an inputting section, performing the steps of: inputting predetermined set values or measured values as a flow rate of the exhaust gas; reading an unknown flow rate of the generated steam as a desired initial value; reading an unknown temperature of the exhaust gas at an outlet of a boiler as a desired initial value; inputting predetermined set values or measured values of a temperature of the water at the an inlet of the boiler; and inputting predetermined set values or measured values of a temperature of the exhaust gas at the inlet of the boiler; the computing apparatus being further provided with a first computing section, performing the steps of: computing pressure of the exhaust gas at an inlet and outlet of a plurality of heat exchangers in response to the flow rate of the exhaust gas; computing flow rate of water or steam of a plurality of heat exchangers in response to the flow rate of the generated steam; computing pressure of water or steam at the inlet and outlet of a plurality of the heat exchangers in response to the flow rate of the water or steam of a plurality of the heat exchangers; using a first expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the exhaust gas; and using a second expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the water or the steam; and as to the heat exchanger except an evaporator, using a third expression for computing a heat transfer from a heat transfer coefficient and a heat transfer area of the heat exchanger, temperature of the exhaust gas and the temperature of the water or the steam in addition to the first and second expressions, wherein the temperature of the exhaust gas at the inlet of plurality of the heat exchangers and the temperature of the water or the steam at the outlet of plurality of the heat exchangers are computed; and the computing apparatus being further provided with a second computing section, performing the steps of: computing an objective polynomial function having a deviation between a computed value of the exhaust gas at the inlet of the boiler and the predetermined set values or measured values as nominal variables thereof, and another deviation between the heat transfer of the evaporator calculated by using the first expression and second expression and the heat transfer calculated by using the third expression as another nominal variable thereof; and amending the temperature of the exhaust gas at the outlet of the boiler and the flow rate of the generated steam in the first computing procedure in order to allow a value of the objective function to become less than a predetermined threshold value and come closer to zero. 4. A generated steam estimation device for a heat recovery steam generator capable of estimating a flow rate, pressure and temperature of generated steam from a state quantity of exhaust gas to be introduced from a gas turbine; and a computing apparatus for estimating the generated steam of the heat recovery steam generator and being provided with an inputting section, performing the steps of: inputting predetermined set values or measured values as a flow rate of the exhaust gas; reading an unknown flow rate of the generated steam and spray flow rate of a high pressure spray as desired initial values; reading an unknown temperature of the exhaust gas at an outlet of a boiler as desired initial value; inputting predetermined set values or measured values of a temperature of water at an inlet of the boiler; and inputting predetermined set values or measured values of the temperature of the exhaust gas at the inlet of the boiler; the computing apparatus further being provided with a first computing section, performing the steps of: computing pressure of the exhaust gas at an inlet and outlet of a plurality of heat exchangers in response to the flow rate of the exhaust gas; computing flow rate of water or steam of a plurality of heat exchangers in response to the flow rate of the generated steam and the spray flow rate of the high pressure spray; computing pressure of water or steam at the inlet and outlet of a plurality of the heat exchangers in response to the flow rate of the water or steam of a plurality of the heat exchangers; using a first expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the exhaust gas; and using a second expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the water or the steam; and as to the heat exchanger except an evaporator, using a third expression for computing a heat transfer from a heat transfer coefficient and a heat transfer area of the heat exchanger, temperature of the exhaust gas and the temperature of the water or the steam in addition to the first and second expressions, wherein the temperature of the exhaust gas at the inlet of plurality of the heat exchangers and the temperature of the water or the steam at the outlet of plurality of the heat exchangers are computed; and the computing apparatus being further provided with a second computing section, performing the steps of: computing an objective polynomial function having a deviation between a computed value of the exhaust gas at the inlet of the boiler and the predetermined set values or measured values as nominal variables thereof, and another deviation between the heat transfer of the evaporator calculated by using the first expression and second expression and the heat transfer calculated by using the third expression as a nominal variable thereof; amending the temperature of the exhaust gas at the outlet of the boiler and the flow rate of the generated steam in the first computing procedure in order to allow a value of the objective function to become less than a predetermined threshold value and come closer to zero; and amending the spray flow rate of the high pressure spray in the first computing section in order to allow a deviation between a computed value of the temperature of the generated steam and a predetermined set value controlled by the high pressure spray to become less than a predetermined threshold value and come closer to zero. 5. A maintenance planning support method for a power generation facility including: a computing apparatus for estimating generated steam of a heat recovery steam generator that is provided with a physical model of a combined cycle power generation facility, wherein the physical model of the combined cycle power generation facility is based on a combination of physical models of a gas turbine and steam turbine through a physical model of a heat recovery steam generator, comprising the steps of: computing an amount of an operation cost reduced by a recovery of equipment characteristics resulting from execution of maintenance work of the power generation facility, computing a cumulative loss of the operation cost resulting from an absence of said maintenance work; and determining a timing for implementing the maintenance work, the computing apparatus being provided with the physical model of the power generation facility and the physical model being provided with a first computing procedure, performing the steps of: inputting predetermined set values or measured values as a flow rate of exhaust gas; computing pressure of the exhaust gas at an inlet and outlet of a plurality of heat exchangers in response to the flow rate of the exhaust gas; reading an unknown flow rate of the generated steam as a desired initial value; computing flow rate of water or steam of a plurality of heat exchangers in response to the flow rate of the generated steam; computing pressure of water or steam at the inlet and outlet of a plurality of the heat exchangers in response to the flow rate of the water or steam of a plurality of the heat exchangers; inputting predetermined set value as temperature of the exhaust gas at an outlet of a boiler; and inputting predetermined set values or measured values as a water temperature at an inlet of the boiler; wherein, as to at least one evaporator in a plurality of the heat exchangers, using a first expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the exhaust gas; and using a second expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the water or the steam; and as to the heat exchanger except the evaporator, using a third expression for computing a heat transfer from a heat transfer coefficient and a heat transfer area of the heat exchanger, temperature of the exhaust gas and the temperature of the water or the steam in addition to the first and second expressions, wherein the temperature of the exhaust gas at the inlet of plurality of the heat exchangers and the temperature of the water or the steam at the outlet of plurality of the heat exchangers are computed; and the physical model is provided with a second computing procedure performing the steps of: inputting predetermined set values or measured values as the temperature of the exhaust gas at the inlet of the boiler, computing an objective polynomial function having a deviation between a computed value of the exhaust gas at the inlet of the boiler and the predetermined set values or measured values as nominal variables thereof, and another deviation between the heat transfer of the evaporator calculated by using the first expression and second expression and the heat transfer calculated by using the third expression as a nominal variable thereof; and amending the temperature of the exhaust gas at the outlet of the boiler and the flow rate of the generated steam in the first computing procedure in order to allow a value of the objective function to become less than a predetermined threshold value and closer to zero. 6. The maintenance planning support method for a power generation facility described in claim 5, including displaying on a display means indicates the amount of the operation cost reduced by the recovery of the equipment characteristics resulting from the execution of maintenance work or the cumulative loss of the operation cost resulting from the absence of said maintenance work. 7. The maintenance planning support method for power generation facility described in claim 5, including supplying the timing for executing said maintenance work is supplied to users via communication means. 8. A maintenance planning support system for a power generation facility comprising: a computing apparatus for estimating generated steam of a heat recovery steam generator having a physical model of a combined cycle power generation facility, wherein the physical model of the combined cycle power generation facility is based on a combination of physical models of a gas turbine and steam turbine through a physical model of a heat recovery steam generator, computing an amount of an operation cost reduced by a recovery of equipment characteristics resulting from the execution of maintenance work of the power generation facility, computing a cumulative loss of the operation cost resulting from an absence of said maintenance work; and determining a timing for implementing the maintenance work, the computing apparatus is provided with the physical model of the power generation facility and the physical model is provided with a first computing procedure, wherein; inputting predetermined set values or measured values as a flow rate of exhaust gas; computing pressure of the exhaust gas at an inlet and outlet of a plurality of heat exchangers in response to the flow rate of the exhaust gas; reading an unknown flow rate of the generated steam as a desired initial value; computing flow rate of water or steam of a plurality of heat exchangers in response to the flow rate of the generated steam; computing pressure of water or steam at the inlet and outlet of a plurality of the heat exchangers in response to the flow rate of the water or steam of a plurality of the heat exchangers; inputting predetermined set value as temperature of the exhaust gas at an outlet of a boiler; inputting predetermined set values or measured values as a water temperature at an inlet of the boiler; wherein, as to at least one evaporator in a plurality of the heat exchangers, using a first expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the exhaust gas; and using a second expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the water or the steam; and as to the heat exchanger except the evaporator, using a third expression for computing a heat transfer from a heat transfer coefficient and a heat transfer area of the heat exchanger, temperature of the exhaust gas and the temperature of the water or the steam in addition to the first and second expressions, wherein the temperature of the exhaust gas at the inlet of plurality of the heat exchangers, the temperature of the water or the steam at the outlet of plurality of the heat exchangers are computed; and the physical model being provided with a second computing procedure, wherein; inputting predetermined set values or measured values as the temperature of the exhaust gas at the inlet of the boiler, computing an objective polynomial function having a deviation between a computed value of the exhaust gas at the inlet of the boiler and the predetermined set values or measured values as nominal variables thereof, and another deviation between the heat transfer of the evaporator calculated by using the first expression and second expression and the heat transfer calculated by using the third expression as another nominal variable thereof; and amending the temperature of the exhaust gas at the outlet of the boiler and the flow rate of the generated steam in the first computing procedure in order to allow a value of the objective function to become less than a predetermined threshold value and come closer to zero. 9. The maintenance planning support system for power generation facility described in claim 8, further comprising display means for indicating the amount of the operation cost reduced by the recovery of the equipment characteristics resulting from the execution of maintenance work or the cumulative loss of the operation cost resulting from the absence of said maintenance work. 10. The maintenance planning support system for power generation facility described in claim 8, further comprising communication means for supplying users with the timing for executing said maintenance work determined by said computing apparatus. 11. A maintenance planning support method for power generation facility comprising: a computing apparatus for estimating generated steam of a heat recovery steam generator, wherein a physical model of a combined cycle power generation facility is used based on a combination of physical models of a gas turbine and steam turbine through a physical model of a heat recovery steam generator, computing an amount of an operation cost reduced by a recovery of equipment characteristics resulting from the execution of maintenance work of the power generation facility, computing a cumulative loss of an operation cost resulting from absence of said maintenance work; and determining a timing for implementing the maintenance work, the computing apparatus being provided with the physical model of the power generation facility and the physical model being provided with a first computing procedure, performing the steps of: inputting predetermined set values or measured values as a flow rate of exhaust gas; computing pressure of the exhaust gas at an inlet and outlet of a plurality of heat exchangers in response to the flow rate of the exhaust gas; reading an unknown flow rate of the generated steam and spray flow rate of a high pressure spray as desired initial values; computing flow rate of water or steam of a plurality of heat exchangers in response to the flow rate of the generated steam and the spray flow rate of the high pressure spray; computing pressure of water or steam at the inlet and outlet of a plurality of the heat exchangers in response to the flow rate of the water or steam of a plurality of the heat exchangers; inputting predetermined set value as temperature of the exhaust gas at an outlet of a boiler; inputting predetermined set values or measured values as a water temperature at an inlet of the boiler; wherein, as to at least one evaporator in a plurality of the heat exchangers, using a first expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the exhaust gas; and using a second expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the water or the steam; and as to the heat exchanger except the evaporator, using a third expression for computing a heat transfer from a heat transfer coefficient and a heat transfer area of the heat exchanger, temperature of the exhaust gas and the temperature of the water or the steam in addition to the first and second expressions, wherein the temperature of the exhaust gas at the inlet of plurality of the heat exchangers, the temperature of the water or the steam at the outlet of plurality of the heat exchangers are computed; and the physical model being further provided with a second computing procedure performing the steps of: inputting predetermined set values or measured values as the temperature of the exhaust gas at the inlet of the boiler, computing an objective polynomial function having a deviation between a computing value of the exhaust gas at the inlet of the boiler and the predetermined set values or measured values as nominal variables thereof, and another deviation between the heat transfer of the evaporator calculated by using the first expression and second expression and the heat transfer calculated by using the third expression being another nominal variable thereof; amending the temperature of the exhaust gas at the outlet of the boiler and the flow rate of the generated steam in the first computing procedure in order to allow a value of the objective function to become less than a predetermined threshold value and come closer to zero; and the physical model being further provided with a third computing procedure performing the steps of: amending the spray flow rate of the high pressure spray in the first computing procedure in order to allow a deviation between a computed value of the temperature of the generated steam and a predetermined set value controlled by the high pressure spray to become less than a predetermined threshold value and come closer to zero. 12. A maintenance planning support system for power generation facility comprising: a computing apparatus for estimating generated steam of a heat recovery steam generator, wherein a physical model of a combined cycle power generation facility is used that is based on a combination of physical models of a gas turbine and steam turbine through a physical model of a heat recovery steam generator, a computing section in the computing apparatus for computing an amount of an operation cost reduced by a recovery of equipment characteristics resulting from execution of maintenance work of the power generation facility and computing a cumulative loss of the operation cost resulting from an absence of said maintenance work; and a computing section in the computing apparatus for determining a timing for implementing the maintenance work, the computing apparatus being provided with a physical model of the power generation facility and the physical model being provided with a first computing procedure performing the steps of: inputting predetermined set values or measured values as a flow rate of exhaust gas; computing pressure of the exhaust gas at an inlet and outlet of a plurality of heat exchangers in response to the flow rate of the exhaust gas; reading an unknown flow rate of the generated steam and spray flow rate of a high pressure spray as desired initial values; computing a flow rate of water or steam of a plurality of heat exchangers in response to the flow rate of the generated steam and the spray flow rate of the high pressure spray; computing pressure of water or steam at the inlet and outlet of a plurality of the heat exchangers in response to the flow rate of the water or steam of a plurality of the heat exchangers; inputting predetermined set value as temperature of the exhaust gas at an outlet of a boiler; inputting predetermined set values or measured values as a water temperature at an inlet of the boiler; wherein, as to at least one evaporator in a plurality of the heat exchangers, using a first expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the exhaust gas; and using a second expression for computing a heat transfer from a difference of Enthalpy between the inlet and outlet, which is computed by the flow rate, pressure and temperature of the water or the steam; and as to the heat exchanger except the evaporator, using a third expression for computing a heat transfer from a heat transfer coefficient and a heat transfer area of the heat exchanger, temperature of the exhaust gas and the temperature of the water or the steam in addition to the first and second expressions, wherein the temperature of the exhaust gas at the inlet of plurality of the heat exchangers, the temperature of the water or the steam at the outlet of plurality of the heat exchangers are computed; and the physical model being provided with a second computing procedure performing the steps of: inputting predetermined set values or measured values as the temperature of the exhaust gas at the inlet of the boiler, computing an objective polynomial function having a deviation between a computed value of the exhaust gas at the inlet of the boiler and the predetermined set values or measured values as nominal variables thereof, and another deviation between the heat transfer of the evaporator calculated by using the first expression and second expression and the heat transfer calculated by using the third expression as another nominal thereof; amending the temperature of the exhaust gas at the outlet of the boiler and the flow rate of the generated steam in the first computing procedure in order to allow a value of the objective function to be less than a predetermined threshold value and come closer to zero; and the physical model being further provided with a third computing procedure performing the steps of: amending the spray flow rate of the high pressure spray in the first computing procedure in order to allow a deviation between a computed value of the temperature of the generated steam and a predetermined set value controlled by the high pressure spray to become less than a predetermined threshold value and come closer to zero.