汽轮机技术
汽輪機技術
기륜궤기술
Turbine Technology
2015年
5期
371-373
,共3页
二次再热%热力系统%再热压力优化%焓升优化
二次再熱%熱力繫統%再熱壓力優化%焓升優化
이차재열%열력계통%재열압력우화%함승우화
double reheats%thermal system%reheat pressure optimization%enthalpy rise optimization
蒸汽再热后，循环的吸热平均温度得到了提高，同时减小了汽轮机低压缸的湿汽损失，使系统的循环效率得到大幅度提高，二次再热比一次再热效率要高。为了使二次再热机组获得更高的效率，采用枚举算法对再热压力进行优化，然后在此基础上对给水加热器焓升进行优化。同时为了比较不同回热级数对机组经济性的影响，设计了8级回热和10级回热两个热力系统。最后发现，通过优化再热压力与加热器焓升，二次再热机组循环效率超过49％；考虑到系统的复杂性、投资增加及运行维护的便利性，认为8级回热比10级回热经济性要好。
蒸汽再熱後，循環的吸熱平均溫度得到瞭提高，同時減小瞭汽輪機低壓缸的濕汽損失，使繫統的循環效率得到大幅度提高，二次再熱比一次再熱效率要高。為瞭使二次再熱機組穫得更高的效率，採用枚舉算法對再熱壓力進行優化，然後在此基礎上對給水加熱器焓升進行優化。同時為瞭比較不同迴熱級數對機組經濟性的影響，設計瞭8級迴熱和10級迴熱兩箇熱力繫統。最後髮現，通過優化再熱壓力與加熱器焓升，二次再熱機組循環效率超過49％；攷慮到繫統的複雜性、投資增加及運行維護的便利性，認為8級迴熱比10級迴熱經濟性要好。
증기재열후，순배적흡열평균온도득도료제고，동시감소료기륜궤저압항적습기손실，사계통적순배효솔득도대폭도제고，이차재열비일차재열효솔요고。위료사이차재열궤조획득경고적효솔，채용매거산법대재열압력진행우화，연후재차기출상대급수가열기함승진행우화。동시위료비교불동회열급수대궤조경제성적영향，설계료8급회열화10급회열량개열력계통。최후발현，통과우화재열압력여가열기함승，이차재열궤조순배효솔초과49％；고필도계통적복잡성、투자증가급운행유호적편리성，인위8급회열비10급회열경제성요호。
The mean temperature of the heat addition process is raised and moisture loss is decreased after the steam is reheated ,which will increase the efficiency of the steam cycle .The efficiency of double reheat is higher than that of single reheat.Reheat pressure is optimized by enumeration algorithm to improve the efficiency of double reheat unit .Then the enthalpy rise of feed-water is optimized .In order to compare the effect of regenerator number to the economy of unit , a system with 8 regenerators and a system with 10 regenerators are designed .The result indicates that efficiency of double reheat is beyond 49%after reheat pressure and enthalpy rise is optimized .Taking into account the complexity of the system , investment and maintenance convenience ,the system with 8 regenerators is more economic than 10 regenerators .
