CAJ | 학술논문

因为排烟温度偏高,威胁布袋除尘器的安全,某热电厂在大规模技改之前,夏季高负荷工况下只能切除一级或多级高压回热加热器来降低烟气温度。为了研究切除高加对机组热力性能的影响规律并给出指导建议,首先开展了实际运行机组的高加投退实验,然后利用锅炉/汽轮机运行数据对运行工况下退出高加的方案进行了理论计算与分析,结果表明：退出高加后,给水温度迅速降低,排烟温度随之降低,保护了除尘器安全；每退出一级高加,给水出口温度降低约30~40益,排烟温度则降低10~15益；然而从机组的经济性角度看,虽然退出高加后锅炉热效率略有上升,然而机组总体热效率大幅下降,供电煤耗上升2~8 g/kW·h,按年切除高加运行1000 h估算,年燃料费用将上升34~100万元。
인위배연온도편고,위협포대제진기적안전,모열전엄재대규모기개지전,하계고부하공황하지능절제일급혹다급고압회열가열기래강저연기온도。위료연구절제고가대궤조열력성능적영향규률병급출지도건의,수선개전료실제운행궤조적고가투퇴실험,연후이용과로/기륜궤운행수거대운행공황하퇴출고가적방안진행료이론계산여분석,결과표명：퇴출고가후,급수온도신속강저,배연온도수지강저,보호료제진기안전；매퇴출일급고가,급수출구온도강저약30~40익,배연온도칙강저10~15익；연이종궤조적경제성각도간,수연퇴출고가후과로열효솔략유상승,연이궤조총체열효솔대폭하강,공전매모상승2~8 g/kW·h,안년절제고가운행1000 h고산,년연료비용장상승34~100만원。
Because the exhaust gas temperature on the high level for a long time threatens the safe operation of the bag filter, a power plant relies on the removal of some high pressure ( HP) regenerative heater sunder high load in the summer to reduce the exhaust temperature. In order to assess the influence of removing the HP regeneration heaters on thermal performance, and give a guideline, in this paper, the HP heater off-line was tested, the solution was then calculated using boiler/turbine operating data. The result shows that the temperature of feedwater decrea-ses rapidly after removing the HP heater, the temperature of exhaust decreases and the safety of bag filter is im-proved. Every HP regenerative heater removing can get the water temperature decrease 30~40 ℃, while the ex-haust temperature decreases 10~15 ℃. From an economic perspective, although the boiler thermal efficiency in-creases, the overall economy declines dramatically and the rate of coal consumption increases 2~8 g/kW·h due to the lower thermal efficiency of the unit, the operation costs increase nearly 340~1 000 thousand yuan per year.