自升压蒸汽动力循环的理论研究

Theoretical Research on the Steam Power Cycle with Self-Pressure Lifting Technology

采用超音速汽液两相流升压加热技术,回收透平抽汽对液态工质加热过程中损失的部分有用能完成升压,从而代替泵和回热加热器,与锅炉、汽轮机及凝汽器等构成自升压蒸汽动力循环,其效率比初终参数和回热级数相同的蒸汽动力循环提高2 6%.由于回热系统无面式换热器,因而锅炉给水在加热过程中不接触铜质换热面,消除了高压蒸汽含铜的现象,也避免了杂质在透平通流部分的沉积,提高了可靠性.回热加热过程不受不凝结气体和结垢的影响,也不产生疏水,从而简化了回热系统,减小了系统体积.

A new self-pressure lifting steam power cycle was proposed based on the steam injector of supersonicsteam-water two-phase flow. The useful energy loss in the heat transfer between the feedwater and the extraction water was reclaimed partially to substitute pumps and heaters and to lift the feedwater. Composed of steam injectors, a boiler, a turbine and a condenser, the new cycle increases 2.6% of the coefficiency compared with the conventional steam power cycle of the same initial, terminal parameters and the same regeneration stages. Because of no solid heat transfer interface in the regeneration system, the boiler feedwater does not contact any copper tube and the defect of confamination of high pressure vapor by copper is resolved completely. The solid impurity does not aggradate in the flow section of the turbine and the reliable of the system is improved. Moreover, the regeneration system is not influenced by non-condensing gas and dirt, and no drain water is produced in the heating process. The system can be simplified and its dimension can be decreased.