Heating Medium Supply System, Integrated Solar Combined Cycle Electric Power Generation System and Method of Controlling These Systems

Abstract

A heating medium supply system is provided which, even when a temperature fluctuation of a heating medium occurs continuously, is capable of relieving a bad thermal influence upon a heat exchanging device due to the temperature fluctuation. The heating medium supply system includes: a heating system configured to heat a liquid heating medium by sunlight; a heat exchanging device configured to heat feedwater; heating medium supply piping for circulating the heating medium; a heating medium temperature detecting device, a heating medium flow rate detecting device and a first heating medium flow control valve; and a control device capable of calculating a value of supply thermal energy from results of detections by the heating medium temperature detecting device and the heating medium flow rate detecting device and controlling an operation of the heating medium flow control valve based on the value of supply thermal energy thus calculated.

1 . An integrated solar combined cycle electric power generation system comprising:
 a steam turbine;   a gas turbine;   a waste heat recovery boiler configured to generate steam by utilizing waste heat of said gas turbine and supply steam thus generated to said steam turbine;   a heating medium supply system having a heat exchanging device for generating steam to be supplied to said steam turbine and configured to supply said heat exchanging device with a heating medium for heating water therein by collected solar thermal energy;   a steam supply passage interconnecting said heat exchanging device and a steam pipe of said waste heat recovery boiler for supplying steam to said waste heat recovery boiler;   a steam flow rate detecting device and a first steam flow rate controlling device, which are provided on said steam supply passage; and   a control device capable of controlling a flow rate of steam passing through said steam supply passage by means of said first steam flow rate controlling device based on a result of detection by said steam flow rate detecting device.   
     
     
         2 . The integrated solar combined cycle electric power generation system according to  claim 1 , further comprising: a steam pressure detecting device provided on said steam supply passage; a turbine bypass passage branched off from said steam supply passage at a location upstream of said steam pressure detecting device and connected to an outlet side of said steam turbine; and a second steam flow rate controlling device provided on said turbine bypass passage. 
     
     
         3 . The integrated solar combined cycle electric power generation system according to  claim 1 , wherein:
 said waste heat recovery boiler comprises a preheating section for preheating feedwater, an evaporating section for evaporating feedwater preheated, and a superheating section for heating steam generated by said evaporating section to obtain superheated steam; and   said steam supply passage is connected to said superheating section of said waste heat recovery boiler.   
     
     
         4 . The integrated solar combined cycle electric power generation system according to  claim 1 , wherein said heating medium supply system comprises a heating medium supply system including
 a heating system configured to heat a heating medium by sunlight;   a heat exchanging device configured to heat feedwater by means of the heating medium supplied thereto from said heating system;   a heating medium supply passage for circulating the heating medium to said heating system and to said heat exchanging device;   a first heating medium temperature detecting device, a heating medium flow rate detecting device and a first heating medium flow rate controlling device, which are provided on said heating medium supply passage at respective locations between an outlet of said heating system and an inlet of said heat exchanging device; and   a control device capable of controlling an operation of said first heating medium flow rate controlling device based on results of detections by said first heating medium temperature detecting device and said heating medium flow rate detecting device.   
     
     
         5 . A method of controlling a supply flow rate of steam in an integrated solar combined cycle electric power generation system including a steam turbine, a gas turbine, a waste heat recovery boiler configured to generate steam by utilizing waste heat of said gas turbine and supply steam thus generated to said steam turbine, a heating medium supply system having a heat exchanging device for generating steam to be supplied to said steam turbine and configured to supply said heat exchanging device with a heating medium for heating water therein by collected solar thermal energy, a steam supply passage interconnecting said heat exchanging device and a steam pipe of said waste heat recovery boiler for supplying steam to said waste heat recovery boiler, a steam flow rate detecting device and a first steam flow rate controlling device, which are provided on said steam supply passage, and a control device capable of controlling a flow rate of steam passing through said steam supply passage by means of said first steam flow rate controlling device based on a result of detection by said steam flow rate detecting device, the method comprising the steps of:
 continuously or intermittently detecting a supply flow rate of steam to be supplied from said heat exchanging device to said waste heat recovery boiler; and   controlling the supply flow rate of steam to be supplied from said heat exchanging device to said waste heat recovery boiler so that a rate of increase with time in the supply flow rate of steam does not exceed a predetermined value.   
     
     
         6 . The method according to  claim 5 , wherein:
 said integrated solar combined cycle electric power generation system comprises an integrated solar combined cycle electric power generation system further including a steam pressure detecting device provided on said steam supply passage; a turbine bypass passage branched off from said steam supply passage at a location upstream of said steam pressure detecting device and connected to an outlet side of said steam turbine; and a second steam flow rate controlling device provided on said turbine bypass passage; and   said control device controls an operation of said second steam flow rate controlling device so that a steam pressure detected by said steam pressure detecting device does not exceed a predetermined value.   
     
     
         7 . A method of controlling a heating medium flow rate and a steam flow rate in an integrated solar combined cycle electric power generation system wherein the integrated solar combined cycle electric power generation system includes a steam turbine, a gas turbine, a waste heat recovery boiler configured to generate steam by utilizing waste heat of said gas turbine and supply steam thus generated to said steam turbine, a heating medium supply system having a heat exchanging device for generating steam to be supplied to said steam turbine and configured to supply said heat exchanging device with a heating medium for heating water therein by collected solar thermal energy, a steam supply passage interconnecting said heat exchanging device and a steam pipe of said waste heat recovery boiler for supplying steam to said waste heat recovery boiler, a steam flow rate detecting device and a first steam flow rate controlling device, which are provided on said steam supply passage, and a control device capable of controlling a flow rate of steam passing through said steam supply passage by means of said first steam flow rate controlling device based on a result of detection by said steam flow rate detecting device, and wherein said heating medium supply system including a heating system configured to heat a heating medium by sunlight, a heat exchanging device configured to heat feedwater by means of the heating medium supplied thereto from said heating system, a heating medium supply passage for circulating the heating medium to said heating system and to said heat exchanging device, a first heating medium temperature detecting device, a heating medium flow rate detecting device and a first heating medium flow rate controlling device, which are provided on said heating medium supply passage at respective locations between an outlet of said heating system and an inlet of said heat exchanging device, and a control device capable of controlling an operation of said first heating medium flow rate controlling device based on results of detections by said first heating medium temperature detecting device and said heating medium flow rate detecting device, the method comprising:
 continuously or intermittently calculating a value of thermal energy to be supplied to said heat exchanging device by the heating medium from a temperature and flow rate of the heating medium to be supplied to said heat exchanging device; 
 controlling the flow rate of the heating medium to be supplied to said heat exchanging device so that a rate of increase with time in the supply energy does not exceed a predetermined value; 
 continuously or intermittently detecting a supply flow rate of steam to be supplied from said heat exchanging device to said waste heat recovery boiler; and 
 controlling the supply flow rate of steam to be supplied from said heat exchanging device to said waste heat recovery boiler so that a rate of increase with time in the supply flow rate of steam does not exceed a predetermined value.