熔盐蓄热式过热蒸汽发电技术研究

Researchon Molten Salt Regenerative Superheated Steam Power Generation Technology

研究熔盐蓄热式过热蒸汽发电技术的可行性。以120t/h转炉为例,通过Aspen Plus软件对炼钢周期内高温烟气与低温熔盐的换热过程以及高温熔盐与低压饱和蒸汽的换热过程进行热力计算,结合理论计算数据对熔盐蓄热式过热蒸汽发电技术进行技术可行性及经济性分析。高温烟气入口温度为800℃~900℃时,通过熔盐蓄放热技术,可将低压饱和蒸汽过热至300℃,利用300℃的过热蒸汽进行发电,可使汽轮机组发电量增加40%左右,减轻了汽轮机末级叶片汽蚀损坏,提高了整机设备的使用寿命。熔盐蓄热式过热蒸汽发电技术替代传统的低压饱和蒸汽发电技术,可应用于炼钢余热回收利用领域。

The paper studies the feasibility of molten salt thermal storage superheated steam power generation technology.Taking a 120t/h converter as an example,the heat transfer between high temperature flue gas and low temperature molten salt,and between high temperature molten salt and low pressure saturated steam in steelmaking cycle were calculated by Aspen Plus software.It combines theoretical calculation data to analyze the technical feasibility and economic efficiency of molten salt thermal storage superheated steam power generation technology.When the inlet temperature of high⁃temperature flue gas is between 800℃and 900℃,the low⁃pressure saturated steam can be superheated to 300℃through molten salt heat storage and release technology.The steam turbine unit utilizes 300℃superheated steam for power generation,which can increase the power generation by about 40%.This technology reduces cavitation damage to the last stage blades of steam turbines and improves the service life of the entire equipment.Molten salt thermal storage superheated steam power generation technology can replace traditional low⁃pressure saturated steam power generation technology and be applied in the field of steel making waste heat recovery and utilization.