CAJ | 학술논문

以某亚临界335 MW机组为例,计算再热蒸汽温度(再热汽温)提高时锅炉各个受热面的吸热量及烟气进口温度等参量的变化,得出提高再热汽温对锅炉及机组热力特性的影响程度并进行经济性分析.结果表明：通过增加再热受热面面积提高再热汽温对锅炉炉膛热工况和排烟温度的影响较小；布置在中、高温再热器之后的对流受热面的吸热量和烟气进口温度随再热汽温的提高逐渐降低,且其变化幅度沿烟气流程依次减小；再热汽温每提高10℃机组容量增大约5 MW,循环效率提高约0．85％；对再热汽温从538℃提高至566℃进行了具体方案设计,改造后每年可获得收益395．72万元.
이모아림계335 MW궤조위례,계산재열증기온도(재열기온)제고시과로각개수열면적흡열량급연기진구온도등삼량적변화,득출제고재열기온대과로급궤조열력특성적영향정도병진행경제성분석.결과표명：통과증가재열수열면면적제고재열기온대과로로당열공황화배연온도적영향교소；포치재중、고온재열기지후적대류수열면적흡열량화연기진구온도수재열기온적제고축점강저,차기변화폭도연연기류정의차감소；재열기온매제고10℃궤조용량증대약5 MW,순배효솔제고약0．85％；대재열기온종538℃제고지566℃진행료구체방안설계,개조후매년가획득수익395．72만원.
Taking a subcritical 335 MW unit as the example,the variations of heat absorptions of each heat-ing surface and the flue gas inlet temperature were calculated,when the reheat steam temperature was in-creased.Thus,the effect of increasing reheat steam temperature on boiler thermal performances was inves-tigated,and the economic analysis was also carried out.The results show that:as the reheat steam tempera-ture rose,the boiler thermal performance and exhaust gas temperature varied slightly;the heat absorptions and flue gas inlet temperatures of the heating surfaces arranged after the secondary and the last stage re-heaters decreased gradually;moreover,the decrease degree weakened sequentially along the flue gas path;a rise of 10 ℃ in reheat steam temperature may lead to about an increase of 5 MW in unit capacity and 0.85% in cycle efficiency.Finally,a detailed scheme of improving reheat steam temperature from 538 ℃ to 5 6 6 ℃ was put forward.After transformation,the annual income of this system can be increased by 3.957 2×106 yuan.