耦合不同储热模式的热电联产机组调峰性能研究

Research on Peak Shaving Performance of Cogeneration Unit Coupled with Different Heat Storage Modes

储热技术是目前应用最广泛的储/蓄能技术之一,因此在燃煤机组的“三改联动”过程中,耦合储热装置的灵活性改造技术具有较好的应用前景。为了评价不同储热模式改造技术的性能,建立了耦合高温储热、低温储热、高低温储热、低温电锅炉储热以及高温电锅炉储热的热电联产机组性能计算模型,并以某350 MW机组为例进行了性能计算。结果表明,在机组调峰能力方面,由于电锅炉的功率可大可小,相对灵活,因此采用电锅炉的方式可以将机组出力降低至30%甚至更低,具有更好的调节灵活性;而采用低温储热方式的机组调峰能力最差,最低负荷率只能降低至42%左右。从机组的综合热效率方面看,低温储热方式的综合热效率最高,不同储热负荷下均能超过51%,低温电锅炉模式最低,仅有38.93%,其余三种储热模式综合热效率相当。

The thermal storage technology is currently one of the most widely used energy storage/storage tech-nologies at present.Therefore,in the process of"three reforms and linkage"of coal-fired units,the flexible ref-ormation technology of coupled heat storage devices has good application prospects.In order to evaluate the per-formance of different heat storage mode transformation technologies,a performance calculation model for cogen-eration units that couples high-temperature heat storage,low-temperature heat storage,high-low temperature heat storage,low-temperature electric boiler heat storage,and high-temperature electric boiler heat storage is establishesd.Taking a 350 MW unit as an example,the performance calculation is carried out.The results show that,in terms of the peak regulation capacity of the unit,since the power of the electric boiler can be large or small and relatively flexible,the use of the electric boiler can reduce the output of the unit to 30%or even lower,and has better adjustment flexibility;The unit that adopts the low-temperature heat storage method has the worst peak shaving capacity,and the minimum load rate can only be reduced to about 42%.From the per-spective of the comprehensive thermal efficiency of the unit,the low-temperature heat storage mode has the highest comprehensive thermal efficiency,which can exceed 51%under different heat storage loads,and the low-temperature electric boiler mode is the lowest,only 38.93%.