Reheat type waste heat recovery boiler and power generation plant

A reheat type waste heat recovery boiler comprising:

• first heat exchanger means in which feed water is heat-exchanged with exhaust gas to produce low temperature vapor;
• second reheat exchanger means in which said low temperature vapor is reheated with said exhaust gas to produce reheated high temperature vapor;
• first passage means for supplying said low temperature vapor to high pressure turbine means;
• and
• second passage means for supplying said reheated high temperature vapor to medium/low pressure turbine means.

A power generation plant comprising:

• gas turbine means;
• waste heat recovery boiler in which feed water is heat-exchanged with exhaust gas from said gas turbine means to produce low temperature vapor and high temperature vapor, said boiler including separate high temperature heat exchanger means for producing said high temperature vapor and low temperature heat exchanger means for producing said low temperature vapor, said low temperature heat exchanger means being interposed between said separate high temperature heat exchanger means;
• steam turbine means to which said low temperature vapor and said high temperature vapour are supplied from said waste heat recovery boiler;
• generator means driven by said steam turbine means;
• and
• condenser means for condensing vapor from said steam turbine means into condensate and for supplying said condensate to said waste heat recovery boiler as said feed water.

A reheat type power generation plant comprising:

• gas turbine means;
• waste heat recovery boiler in which feed water is heat-exchanged with exhaust gas from said gas turbine means to produce low temperature vapor, and said low temperature vapor is reheated with said exhaust gas to produce high temperature vapor;
• steam turbine system including high pressure turbine and medium/low pressure turbine;
• generator means driven by said steam turbine system;
• first passage means for supplying said low temperature vapor to said high pressure turbine means;
• and
• second passage means for supplying said reheated high temperature vapor to said medium/low pressure turbine means.

A power generation plant comprising:

• gas turbine means;
• waste heat recovery boiler in which feed water is heat-exchanged with exhaust gas from said gas turbine means to produce vapor, said waste heat recovery boiler including a secondary reheater, a super heater, a primary reheater for heating vapor to be supplied to said secondary reheater, and vapor generating means for heating said feed water to vapor and for supplying said vapor to said super heater in order with respect to the exhaust gas flow;
• steam turbine system including high pressure turbine means and medium/low pressure turbine means to both of which said vapor is supplied from said waste heat recovery boiler;
• generator means driven by said steam turbine system;
• condenser means for condensing vapor from said steam turbine system into condensate and for supplying said condensate to said waste heat recovery boiler as said feed water;
• first passage means for supplying vapor from said super heater to said high pressure turbine means;
• and
• second passage means for supplying vapor from said secondary reheater to said medium/low pressure turbine means.

A power generation plant comprising:

• gas turbine means;
• waste heat recovery boiler in which feed water is heat-exchanged with exhaust gas from said gas turbine means to produce vapor, said waste heat recovery boiler including a secondary reheater, a secondary super heater, a primary reheater heating vapor to be supplied to said secondary reheater, a primary super heater heating vapor to be supplied to said secondary super heater and vapor generating means for heating said feed water to vapor and for supplying said vapor to said primary super heater in order with respect to the exhaust gas flow;
• steam turbine system including high pressure turbine means and medium/low pressure turbine means to both of which said vapor is supplied from said waste heat recovery boiler;
• generator means driven by said steam turbine system;
• condenser means for condensing vapor from said steam turbine system into condensate and for supplying said condensate to said waste heat recovery boiler as said feed water;
• first passage means for supplying vapor from said secondary super heater to said high pressure turbine means;
• and
• second passage means for supplying vapor from said secondary reheater to said medium/low pressure turbine means.