Power-generating device and power-generating method using organic rankine cycle

Abstract

A power-generating device using an organic Rankine cycle uses heat recovered from an exhaust gas treated in an exhaust gas treatment device, the power-generating device including a heat exchanger, an evaporator, a steam turbine, a power generator, a condenser, and a medium pump.

What is claimed is: 
     
         1 . A power-generating device, comprising an organic Rankine cycle system using heat recovered from an exhaust gas,
 wherein the organic Rankine cycle system comprises:   an exhaust gas treatment device including an air preheater (APH), an electrostatic precipitator (ESP), and a flue-gas desulfurization device (FGD);   a first heat exchanger provided between the air preheater and the electrostatic precipitator;   a second heat exchanger provided between the electrostatic precipitator and the flue-gas desulfurization device,   a first evaporator for evaporating an organic solvent through use of heat recovered by the first heat exchanger to generate steam;   a second evaporator for evaporating an organic solvent through use of heat recovered by the second heat exchanger to generate steam;   a steam turbine to be driven with steam generated by the first evaporator and the second evaporator;   a power generator for generating power by a drive of the steam turbine;   a condenser for condensing steam that has driven the steam turbine to obtain an organic solvent; and   a medium pump for sending the condensed organic solvent from the condenser to the first evaporator and the second evaporator.   
     
     
         2 . A power-generating device according to  claim 1 , further comprising a cooling tower for circulating cooling water in the condenser. 
     
     
         3 . A power-generating device, comprising an organic Rankine cycle system using heat recovered from an exhaust gas,
 wherein the organic Rankine cycle system comprises:   an exhaust gas treatment device including an air preheater (APH), an electrostatic precipitator (ESP), and a flue-gas desulfurization device (FGD);   a first evaporator provided between the air preheater and the electrostatic precipitator, for evaporating an organic solvent to generate steam;   a second evaporator provided between the electrostatic precipitator and the flue-gas desulfurization equipment, for evaporating an organic solvent to generate steam;   a steam turbine to be driven with steam generated by the first evaporator and the second evaporator;   a power generator for generating power by a drive of the steam turbine;   a condenser for condensing steam that has driven the steam turbine to obtain an organic solvent; and   a medium pump for sending the condensed organic solvent from the condenser to the first evaporator and the second evaporator.   
     
     
         4 . A power-generating device according to  claim 3 , further comprising a cooling tower for circulating cooling water in the condenser. 
     
     
         5 . A power-generating device, comprising an organic Rankine cycle system using heat recovered from an exhaust gas,
 wherein the organic Rankine cycle system comprises:   an exhaust gas treatment device including an air preheater (APH), an electrostatic precipitator (ESP), and a flue-gas desulfurization device (FGD);   a first heat exchanger provided between the air preheater and the electrostatic precipitator;   a first evaporator for evaporating an organic solvent through use of heat recovered by the first heat exchanger to generate steam;   a first steam turbine to be driven with steam generated by the first evaporator;   a first power generator for generating power by a drive of the first steam turbine;   a first condenser for condensing steam that has driven the first steam turbine to obtain an organic solvent;   a first medium pump for sending the condensed organic solvent from the first condenser to the first evaporator;   a second heat exchanger provided between the electrostatic precipitator and the flue-gas desulfurization device;   a second evaporator for evaporating an organic solvent through use of heat recovered by the second heat exchanger to generate steam;   a second steam turbine to be driven with steam generated by the second evaporator;   a second power generator for generating power by a drive of the second steam turbine;   a second condenser for condensing steam that has driven the second steam turbine to obtain an organic solvent; and   a second medium pump for sending the condensed organic solvent from the second condenser to the second evaporator.   
     
     
         6 . A power-generating device according to  claim 5 , further comprising a cooling tower for circulating cooling water in at least one of the first condenser and the second condenser. 
     
     
         7 . A power-generating device, comprising an organic Rankine cycle system using heat recovered from an exhaust gas,
 wherein the organic Rankine cycle system comprises:   an exhaust gas treatment device including an air preheater (APH), an electrostatic precipitator (ESP), and a flue-gas desulfurization device (FGD);   a first evaporator provided between the air preheater and the electrostatic precipitator, for evaporating an organic solvent to generate steam;   a first steam turbine to be driven with steam generated by the first evaporator;   a first power generator for generating power by a drive of the first steam turbine;   a first condenser for condensing steam that has driven the first steam turbine to obtain an organic solvent;   a first medium pump for sending the condensed organic solvent from the first condenser to the first evaporator;   a second evaporator provided between the electrostatic precipitator and the flue-gas desulfurization device, for evaporating an organic solvent to generate steam;   a second steam turbine to be driven with steam generated by the second evaporator;   a second power generator for generating power by a drive of the second steam turbine;   a second condenser for condensing steam that has driven the second steam turbine to obtain an organic solvent; and   a second medium pump for sending the condensed organic solvent from the second condenser to the second evaporator.   
     
     
         8 . A power-generating device according to  claim 7 , further comprising a cooling tower for circulating cooling water in at least one of the first condenser and the second condenser. 
     
     
         9 . A power-generating method, comprising a step of executing an organic Rankine cycle using heat recovered from an exhaust gas treated by an exhaust gas treatment device including an air preheater (APH), an electrostatic precipitator (ESP), and a flue-gas desulfurization device (FGD),
 wherein the step of executing an organic Rankine cycle comprises:   a first heat recovery step of recovering heat from an exhaust gas that passes between the air preheater and the electrostatic precipitator;   a second heat recovery step of recovering heat from an exhaust gas that passes between the electrostatic precipitator and the flue-gas desulfurization device;   a first steam generation step of evaporating an organic solvent through use of heat recovered in the first heat recovery step to generate steam;   a second steam generation step of evaporating an organic solvent through use of heat recovered in the second heat recovery step to generate steam;   a steam turbine drive step of driving a steam turbine with steam generated in the first steam generation step and the second steam generation step;   a power generation step of generating power in the steam turbine drive step;   a condensing step of condensing steam that has driven the steam turbine to obtain an organic solvent; and   a transport step of sending the organic solvent obtained by the condensation to the first steam generation step and the second steam generation step.   
     
     
         10 . A power-generating method, comprising a step of executing an organic Rankine cycle using heat recovered from an exhaust gas treated by an exhaust gas treatment device including an air preheater (APH), an electrostatic precipitator (ESP), and a flue-gas desulfurization device (FGD),
 wherein the step of executing an organic Rankine cycle comprises:   a first steam generation step of evaporating an organic solvent through use of heat of an exhaust gas that passes between the air preheater and the electrostatic precipitator to generate steam;   a second steam generation step of evaporating an organic solvent through use of heat of an exhaust gas that passes between the electrostatic precipitator and the flue-gas desulfurization device to generate steam;   a steam turbine drive step of driving a steam turbine with steam generated in the first steam generation step and the second steam generation step;   a power generation step of generating power in the steam turbine drive step;   a condensing step of condensing steam that has driven the steam turbine to obtain an organic solvent; and   a transport step of sending the organic solvent obtained by the condensation to the first steam generation step and the second steam generation step.   
     
     
         11 . A power-generating method, comprising a step of executing an organic Rankine cycle using heat recovered from an exhaust gas treated by an exhaust gas treatment device comprising an air preheater (APH), an electrostatic precipitator (ESP), and a flue-gas desulfurization device (FGD),
 wherein the step of executing an organic Rankine cycle comprises:   a first heat recovery step of recovering heat from an exhaust gas that passes between the air preheater and the electrostatic precipitator;   a first steam generation step of evaporating an organic solvent through use of heat recovered in the first heat recovery step to generate steam;   a first steam turbine drive step of driving a first steam turbine with steam generated in the first steam generation step;   a first power generation step of generating power in the first steam turbine drive step;   a first condensing step of condensing steam that has driven the first steam turbine to obtain an organic solvent;   a first transport step of sending the organic solvent obtained by the condensation to the first steam generation step;   a second heat recovery step of recovering heat from an exhaust gas that passes between the electrostatic precipitator and the flue-gas desulfurization device;   a second steam generation step of evaporating an organic solvent through use of heat recovered in the second heat recovery step to generate steam;   a second steam turbine drive step of driving a second steam turbine with steam generated in the second steam generation step;   a second power generation step of generating power in the second steam turbine drive step;   a second condensing step of condensing steam that has driven the second steam turbine to obtain an organic solvent; and   a second transport step of sending the organic solvent obtained by the condensation to the second steam generation step.   
     
     
         12 . A power-generating method, comprising a step of executing an organic Rankine cycle using heat recovered from an exhaust gas treated by an exhaust gas treatment device including an air preheater (APH), an electrostatic precipitator (ESP), and a flue-gas desulfurization device (FGD),
 wherein the step of executing an organic Rankine cycle comprises:   a first steam generation step of evaporating an organic solvent through use of heat of an exhaust gas that passes between the air preheater and the electrostatic precipitator to generate steam;   a first steam turbine drive step of driving a first steam turbine with steam generated in the first steam generation step;   a first power generation step of generating power in the first steam turbine drive step;   a first condensing step of condensing steam that has driven the first steam turbine to obtain an organic solvent;   a first transport step of sending the organic solvent obtained by the condensation to the first steam generation step;   a second steam generation step of evaporating an organic solvent through use of heat of an exhaust gas that passes between the electrostatic precipitator and the flue-gas desulfurization device to generate steam;   a second steam turbine drive step of driving a second steam turbine with steam generated in the second steam generation step;   a second power generation step of generating power in the second steam turbine drive step;   a second condensing step of condensing steam that has driven the second steam turbine to obtain an organic solvent; and   a second transport step of sending the organic solvent obtained by the condensation to the second steam generation step.