CAJ | 학술논문

基于常规烟气余热利用系统(常规系统1)及常规冷凝热热泵系统(常规系统2)，提出了一种新型的电厂余热利用系统：将空气预热器(空预器)后的烟气作为热泵的驱动热源，通过热泵技术对冷凝热进行回收，加热采暖供热热水，减少换热过程的火用损失，节省汽轮机抽汽，增加机组发电功率；在省煤器出口抽出部分烟气，用来加热热泵出口的供暖热水，以满足在极端寒冷期间供暖的要求.结合某330 MW供热机组，分析了该系统的节能效果，并与常规系统1和常规系统2进行比较.结果表明：该新型余热利用系统比常规系统1每年可节约8487．8 t标煤；比常规系统2发电功率可增加1．3％~2．7％.该新型余热利用系统的节能环保效果显著.
기우상규연기여열이용계통(상규계통1)급상규냉응열열빙계통(상규계통2)，제출료일충신형적전엄여열이용계통：장공기예열기(공예기)후적연기작위열빙적구동열원，통과열빙기술대냉응열진행회수，가열채난공열열수，감소환열과정적화용손실，절성기륜궤추기，증가궤조발전공솔；재성매기출구추출부분연기，용래가열열빙출구적공난열수，이만족재겁단한랭기간공난적요구.결합모330 MW공열궤조，분석료해계통적절능효과，병여상규계통1화상규계통2진행비교.결과표명：해신형여열이용계통비상규계통1매년가절약8487．8 t표매；비상규계통2발전공솔가증가1．3％~2．7％.해신형여열이용계통적절능배보효과현저.
On the basis of analysis on two kinds of waste heat utilization approaches,using the low-tempera-ture flue gas waste heat to heat the condensate water and feed water by installing heat exchangers in the tail flue duct,and improving the quality of steam turbine exhaust and circulating water to supply heat for users by adopting absorption heat pumps,a novel waste heat utilization system for thermal power plants was proposed.In this system,the flue gas after the air preheater is regarded as the heat pump's driving heat source,thus the absorption heat pump can recover the heat of condensation and heat the heating hot water. In addition,in order to meet the heating requirements in extremely cold periods,the heat exchanger is in-stalled after the economizer in the tail flue duct,in which the heating hot water from heat pump exit is heated by part of the flue gas extracted from outlet of the economizer.In this system,the low-temperature heat is recovered by the absorption heat pump,so that the exergy loss is reduced in the heat transfer process,the extraction steam from the steam turbine decreases and the output power increases.Further-more,combined with a 330 MW heat supply unit,this novel system's energy-saving effect was analyzed and the results were compared with that of the conventional flue gas waste heat utilization system (convention-al system I)and the conventional condensation heat heat pump system (conventional system2).The results show that,the annual standard coal consumption of the unit applying this novel system is 8 487.8 t less than that applying the conventional system I,and the output power is 1.3% to 2.7% higher than that ap-plying the conventional system II,which indicates the energy saving effect of this novel waste heat utiliza-tion system is remarkable.