CAJ | 학술논문

通过对200 MW机组高背压循环水供热改造后的系统进行热力计算分析发现：热网循环水流量及采暖抽汽流量的变化对机组热耗率、出力、对外热负荷、循环水出水温度等参数的影响相对较小，各种运行工况下燃料利用系数均可达到90％左右，能源综合利用效果好；但对机组背压的影响较大，机组运行调整灵活性差，改造工作量大，改造后需把握好更换转子时机，对外供热热负荷较小的机组不宜实施改造；200 MW机组改造后低压缸做功量小，建议采用低压缸解列方案，以缩小改造范围和难度。
통과대200 MW궤조고배압순배수공열개조후적계통진행열력계산분석발현：열망순배수류량급채난추기류량적변화대궤조열모솔、출력、대외열부하、순배수출수온도등삼수적영향상대교소，각충운행공황하연료이용계수균가체도90％좌우，능원종합이용효과호；단대궤조배압적영향교대，궤조운행조정령활성차，개조공작량대，개조후수파악호경환전자시궤，대외공열열부하교소적궤조불의실시개조；200 MW궤조개조후저압항주공량소，건의채용저압항해렬방안，이축소개조범위화난도。
After retrofitting on high back pressure circulating water heating for a 200 MW unit,thermodynamic cal-culation was performed.The results show that,the heat net circulating water quantity and steam extraction amount (for heat supply)has little effects unit parameters such as heat consumption rate,unit output,heat load and circu-lating water outlet temperature.Under each working condition,the fuel utilization coefficient can reach about 90%, implying the energy comprehensive utilization effect is great.However,the unit back pressure is greatly affected by the heat net circulating water quantity and steam extraction amount.Moreover,the unit's operation regulating flexi-bility got poor and the retrofitting work capacity is pretty huge.The rotor changing time must be carefully selected after the retrofitting,and the units with very small heat load are not suitable for transformation.Due to small out-put of the 200 MW unit's low pressure (LP)cylinder,it suggests that the LP cylinder be split to reduce the modifi-cation range and simplify the steps.