过载补汽节流配汽机组流量特性及重叠度试验研究

某超临界汽轮机组配汽机构采用带过载补汽节流配汽方式。在实际运行过程中,由于该机组的配汽函数偏离于汽轮机的实际流量特性,尤其是过载补汽阀与主调节阀之间未设置必要的重叠度,因而,使得该机组的AGC及一次调频特性均难以满足电网调频需求。经过现场汽轮机流量特性与重叠度的精细化调整,实现了该机组的进汽流量的精确控制,既提高了机网协调品质,又为机组安全高效运行起到了有效的指导作用;可为同类型机组流量特性整定工作以及调节阀重叠度设定提供参考。

华能玉环电厂超超临界汽轮机过载补汽技术

介绍了华能浙江分公司玉环电厂(华能玉环电厂)超超临界1000 MW汽轮机过载补汽技术。采用过载补汽技术,在额定工况以下补汽阀未开启时机组经济性有很大提高,并具备调频能力。在额定工况以上,补汽阀开启时,因节流机组经济性下降。

Enhancement of acetylene and ethylene yields in partially decoupled oxidation of ethane by changing the composition of heat carrier

In our previous work,a partially decoupled process(PDP)was proposed for efficient conversion of ethane to increase the ethylene yield and a new structural reactor called forward-impinging-back reactor(FIB)was proposed for scale-up.In this work,the influence of changing the composition and temperature of the heat carrier was investigated by simulations with detailed chemistry to further increase of the C_(2)(C_(2)H_(2)+C_(2)H_(4))yield in the PDP of ethane.At ideal mixing conditions,the C_(2) yield is 75.3%without steam addition and it is 82.9%at steam addition ratio of β=1.4.In comparison,the C_(2) yield in an FIB reactor is 62.4%without steam addition and it increases to 78.5%with steam addition(β=1.4).The requirement of high mixing efficiency is diminished by steam addition,which is favorable for reactor scale-up.

汽轮机过载补汽技术在百万电厂中的运用

介绍了粤电平海电厂超超临界1000MW汽轮机过载补汽技术。采用过载补汽技术,在额定工况以下补汽阀未开启时机组经济性有很大提高,并具备调频能力。在额定工况以上,补汽阀开启时,因节流机组经济性下降。补汽阀是一项提高机组调频灵活性、提高效率和可靠性的成熟技术。

过载补汽技术在大型汽轮机中的应用

介绍了过载补汽阀的结构及技术特点,以某600MW机组为例,定量分析了过载补汽结构对机组性能的影响。结果表明:采用补汽阀后,机组电功率增加38.949MW,提高约6.40%;但机组热耗率增加约59.2kJ/(kW·h),经济性降低约0.78%;汽轮机高压缸效率下降约1.96%。因此,在夏季或其他用电高峰期,采用补汽阀牺牲微量经济性,以保证机组出力是安全可行的。