Condensation system and method for electric power plant

Abstract

The present disclosure relates to a condensation system and method for an electric power plant. The present disclosure comprises a steam turbine, a compressor, and a condenser. The steam turbine comprises a steam turbine outlet, the steam turbine outlet being used for discharging low-pressure hot steam; the compressor comprises a first compressor inlet and a compressor outlet; the condenser comprises a condenser steam inlet, a condenser medium inlet, a condensate outlet, and a condenser air outlet; the hot steam inlet is connected to the steam turbine outlet; the compressor outlet is connected to a condenser medium inlet; the condenser medium inlet is used for inputting liquid carbon dioxide; and the condenser air outlet is connected to the first compressor inlet. In the present disclosure, carbon dioxide is used as a cooling medium, fundamentally solving the problems such as large usage amount of circulation water in an electric power plant, complex anti-corrosion and anti-scaling processes, high waste water treatment cost, and environmental pollution, and achieving effects of consumption reduction, energy conservation, and zero emission of circulation waste water.

What is claimed is: 
     
         1 . A condensation system for an electric power plant, comprising:
 a steam turbine ( 1 ), the steam turbine ( 1 ) comprising a steam turbine outlet, and the steam turbine outlet being used for discharging exhausted steam;   a compressor ( 2 ), the compressor ( 2 ) comprising a first compressor inlet and a compressor outlet; and   a condenser ( 3 ), the condenser ( 3 ) comprising a condenser steam inlet, a condenser medium inlet, a condenser water outlet, and a condenser air outlet, the condenser steam inlet being connected to the steam turbine outlet, the condenser medium inlet being connected to the compressor outlet, the condenser medium inlet being used for inputting liquid carbon dioxide, and the condenser air outlet being connected to the first compressor inlet.   
     
     
         2 . A condensation system for an electric power plant, comprising:
 a steam turbine ( 1 ), the steam turbine ( 1 ) comprising a steam turbine outlet, and the steam turbine outlet being used for discharging live steam;   a compressor ( 2 ), the compressor ( 2 ) comprising a first compressor inlet and a compressor outlet;   a condenser ( 3 ), the condenser ( 3 ) comprising an condenser steam inlet, a condenser medium inlet, a condenser water outlet, and a condenser air outlet, the condenser steam inlet being connected to the steam turbine outlet, the condenser medium inlet being connected to the compressor outlet, the condenser medium inlet being used for inputting liquid carbon dioxide, and the condenser air outlet being connected to the first compressor inlet;   the liquid carbon dioxide is used as a cooling medium, and the cooling medium exchanges heat with the hot steam discharged from the steam turbine ( 1 ) in the condenser ( 3 ) to condense the hot steam; and the gasified carbon dioxide enters the compressor ( 2 ) to be compressed into liquid, and then the liquid enters the condenser ( 3 ) as the cooling medium for recycling.   
     
     
         3 . The condensation system for an electric power plant according to  claim 1 or 2 , further comprising a boiler ( 4 ), and a carbon dioxide separation device ( 5 ), wherein the steam turbine ( 1 ) further comprises a steam turbine inlet, and the compressor ( 2 ) further comprises a second compressor inlet; the boiler ( 4 ) comprises a flue gas outlet and a live steam outlet, the live steam outlet is connected to the steam turbine inlet, the flue gas outlet is used for discharging flue gas containing carbon dioxide, and the live steam passes through the steam turbine ( 1 ) through the steam turbine inlet and is discharged as low-pressure steam from a steam turbine hot steam outlet; the carbon dioxide separation device ( 5 ) comprises a carbon dioxide separation inlet and a carbon dioxide separation outlet, and the carbon dioxide separation inlet is connected to the flue gas outlet; the carbon dioxide separation outlet discharges carbon dioxide; when the carbon dioxide separation outlet discharges gaseous carbon dioxide, the carbon dioxide separation outlet is connected to the second compressor inlet; and when the carbon dioxide separation outlet discharges liquid carbon dioxide, the carbon dioxide separation outlet is connected to the condenser medium inlet. 
     
     
         4 . The condensation system for an electric power plant according to  claim 3 , wherein boiler water pretreatment equipment ( 6 ) is further arranged between the connecting loop of the condenser ( 3 ) and the boiler ( 4 ), and a liquid carbon dioxide storage tank ( 7 ) is further arranged between the compressor outlet and the condenser medium inlet; and a carbon dioxide storage tank ( 8 ) is further arranged between the condenser air outlet and the first compressor inlet. 
     
     
         5 . The condensation system for an electric power plant according to  claim 4 , wherein the boiler water pretreatment equipment ( 6 ) comprises a pretreatment inlet, and a condensate pump ( 9 ) is arranged between the condensate outlet and the pretreatment inlet. 
     
     
         6 . The condensation system for an electric power plant according to  claim 5 , wherein the boiler water pretreatment equipment ( 6 ) further comprises a pretreatment outlet, the boiler ( 4 ) further comprises a feed inlet, and a feed pump ( 10 ) is arranged between the pretreatment outlet and the feed inlet. 
     
     
         7 . The condensation system for an electric power plant according to  claim 6 , wherein the compressor ( 2 ) is a multistage compressor. 
     
     
         8 . A condensation method for an electric power plant, comprising the following steps:
 S 1 , introducing liquid carbon dioxide into a condenser through a condenser medium inlet so that the liquid carbon dioxide exchanges heat with steam discharged from a steam turbine in the condenser to condense steam, discharging obtained condensate through a condensate outlet, and discharging vaporized carbon dioxide from the condenser water outlet; and   S 2 , enabling gaseous carbon dioxide discharged from a condenser air outlet to enter the compressor for compression to obtain liquid carbon dioxide, and enabling the obtained liquid carbon dioxide to enter the condenser for cooling cycle again.   
     
     
         9 . The condensation method for an electric power plant according to  claim 8 , before step S 1 , further comprising the following steps:
 S 11 , discharging flue gas from a boiler through a flue gas outlet to a carbon dioxide separation inlet to be separated in a carbon dioxide separation device, and discharging the carbon dioxide from a separation outlet; and   S 12 , taking a part of separated carbon dioxide as a by-product, and taking the other part of separated carbon dioxide as a supplement of a carbon dioxide circulating system for condenser cooling to be sent to the carbon dioxide circulation system.   
     
     
         10 . The condensation method for an electric power plant according to  claim 9 , after step S 2 , further comprising the step S 21  of sending the condensate discharged from the condensate outlet to the boiler water pretreatment equipment through the condensate pump, and pretreating the condensate by the boiler water pretreatment equipment. 
     
     
         11 . The condensation method for an electric power plant according to  claim 10 , after step S 21 , further comprising the step S 22  of sending the condensate treated by the boiler water pretreatment equipment to the boiler through a feed pump.