CAJ | 학술논문

针对国内燃煤机组排烟温度普遍偏高问题，提出采用烟气余热回收技术对系统进行改造.通过引入“相对效益”的概念，建立“相对效益”热力计算模型，并以“相对效益”和经济效益作为综合指标，分析了烟气参数、凝结水参数、换热器结构参数对烟气余热回收系统整体水平的影响规律.在保证机组安全运行的前提下，应结合系统防腐、防磨、防积灰特性，通过调整上述参数对烟气余热回收系统进行优化.对某600 MW 机组的实际计算结果表明，系统优化后比优化前的设备质量减少了3．9％，相对效益提高了4．4％.
침대국내연매궤조배연온도보편편고문제，제출채용연기여열회수기술대계통진행개조.통과인입“상대효익”적개념，건립“상대효익”열력계산모형，병이“상대효익”화경제효익작위종합지표，분석료연기삼수、응결수삼수、환열기결구삼수대연기여열회수계통정체수평적영향규률.재보증궤조안전운행적전제하，응결합계통방부、방마、방적회특성，통과조정상술삼수대연기여열회수계통진행우화.대모600 MW 궤조적실제계산결과표명，계통우화후비우화전적설비질량감소료3．9％，상대효익제고료4．4％.
Generally,the exhaust gas temperature in domestic coal-fired units is relatively high.Aiming at solving this problem,the flue gas waste heat recovery technology was proposed to carry out technical trans-formation for the unit.By introducing the concept of"relative efficiency",the"relative efficiency" thermo-dynamic calculation model was established.Moreover,considering the "relative efficiency" and economic benefits as a comprehensive index,the influence of such key factors as flue gas parameters,condensate pa-rameters and heat exchanger's structural parameters on overall performance of the flue gas waste heat re-covery system was investigated.On the premise of ensuring the unit safety operation,the corrosion resist-ance,performances of the system like the wear resistance and ash deposition resistance should be consid-ered to optimize the system by regulating the parameters mentioned above.Taking a 600 MW unit as the example,the calculation results show that,after the optimization,the equipment mass of the system de-creased by 3.9%,the relative efficiency increased by 4.4%.