中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2014年
5期
778-783
,共6页
调节级%部分进汽%变工况%量纲分析%压比
調節級%部分進汽%變工況%量綱分析%壓比
조절급%부분진기%변공황%량강분석%압비
governing stage%partial admission%varying condition%dimensional analysis%pressure ratio
基于APROS支撑平台，对喷嘴配汽方式的汽轮机调节级进行变工况热力计算，通过文献提供的实验台实验数据进行对比验证；并研究分析了部分进汽对调节级内压比的影响，确定了不同部分进汽度下调节级效率变化曲线。结果表明，部分进汽不仅造成部分进汽损失，还对调节级内压比产生影响，致使焓降与反动度发生变化，进而引起调节级效率改变。同时，以600 MW汽轮机组为例，建立了考虑部分进汽对压比影响后的调节级效率简化数学模型。在此基础之上，基于量纲分析理论，分别将全开调节阀及半开调节阀后喷嘴组压比简化表示为流量比的函数，提出一种适用于喷嘴配汽的调节级变工况热力计算方法；将计算结果与借助支撑平台的热力计算结果对比，并探讨了喷嘴调节过程中压比与反动度的变化趋势。分析表明，所提出计算方法不仅准确反映部分进汽对级内压比的影响，还对现有的调节级变工况热力计算工作做了进一步完善。
基于APROS支撐平檯，對噴嘴配汽方式的汽輪機調節級進行變工況熱力計算，通過文獻提供的實驗檯實驗數據進行對比驗證；併研究分析瞭部分進汽對調節級內壓比的影響，確定瞭不同部分進汽度下調節級效率變化麯線。結果錶明，部分進汽不僅造成部分進汽損失，還對調節級內壓比產生影響，緻使焓降與反動度髮生變化，進而引起調節級效率改變。同時，以600 MW汽輪機組為例，建立瞭攷慮部分進汽對壓比影響後的調節級效率簡化數學模型。在此基礎之上，基于量綱分析理論，分彆將全開調節閥及半開調節閥後噴嘴組壓比簡化錶示為流量比的函數，提齣一種適用于噴嘴配汽的調節級變工況熱力計算方法；將計算結果與藉助支撐平檯的熱力計算結果對比，併探討瞭噴嘴調節過程中壓比與反動度的變化趨勢。分析錶明，所提齣計算方法不僅準確反映部分進汽對級內壓比的影響，還對現有的調節級變工況熱力計算工作做瞭進一步完善。
기우APROS지탱평태，대분취배기방식적기륜궤조절급진행변공황열력계산，통과문헌제공적실험태실험수거진행대비험증；병연구분석료부분진기대조절급내압비적영향，학정료불동부분진기도하조절급효솔변화곡선。결과표명，부분진기불부조성부분진기손실，환대조절급내압비산생영향，치사함강여반동도발생변화，진이인기조절급효솔개변。동시，이600 MW기륜궤조위례，건립료고필부분진기대압비영향후적조절급효솔간화수학모형。재차기출지상，기우량강분석이론，분별장전개조절벌급반개조절벌후분취조압비간화표시위류량비적함수，제출일충괄용우분취배기적조절급변공황열력계산방법；장계산결과여차조지탱평태적열력계산결과대비，병탐토료분취조절과정중압비여반동도적변화추세。분석표명，소제출계산방법불부준학반영부분진기대급내압비적영향，환대현유적조절급변공황열력계산공작주료진일보완선。
Based on APROS support platform, the thermodynamic calculation of nozzle governing stage was taken, and verified through the comparison of test data which the literature offered. Moreover, the influence of partial admission on pressure ratio was analyzed, and the trend of governing stage efficiency with different partial admission degrees was also obtained. The results show that partial admission not only lead to partial admission losses, but also make an impact on pressure ratio, enthalpy and reaction degree, and finally affect the efficiency. Meanwhile, a simplified efficiency model considering the influence of partial admission on a 600 MW steam turbine was built. Then, the nozzle pressure ratio after full open valve and half one respectively, was expressed as a function of flow ratio based on dimensional analysis. this paper introduced a new method for thermodynamic calculation of nozzle governing stage. Comparing with the calculation by means of support platform, and discussing the change of pressure ratio and reaction degree, it shows that the method can reflect the influence of partial admission on pressure ratio, and further improve the accuracy of existing thermodynamic calculation.
