基于MVR技术的单级双效蒸发浓缩系统性能分析

Performance Analysis of Single-Stage and Double-Effect Evaporative Concentration System Based on MVR Technology

随着我国工业废水行业市场规模与平均处理成本的逐年上升,先进蒸发浓缩技术得到了广泛关注。本文在机械蒸汽压缩机升压能力不断提高的现状基础上,提出机械蒸汽再压缩(MVR)单级双效蒸发浓缩系统,研究物料浓度、蒸发温度、压比、换热温差等对系统热力性能的影响,并通过对比单级压缩机系统,获得单级双效MVR系统的性能分析曲线和节能优势。结果表明,单级双效MVR系统压缩机压比大于1.9时,系统能效系数(COP)可达25以上;在满足蒸汽温升的条件下,系统COP随压缩机压比、蒸发温度升高而降低,压比升高0.1,COP下降4.4%;第一效蒸发温度升高10℃,COP下降3.1%。

The advanced evaporative and concentration technology receives extensive attention due to the increase of industrial wastewater market size and the average treatment cost in our country these years. Considering the increasing capacity of compressor pressure ratio, a single-stage double-effect mechanical vapor recompression（MVR） system was proposed in this paper. The influences of material concentration, evaporation temperature, compression ratio, temperature difference on the thermal performance of single-stage and double-effect MVR system were studied in detail. The performance analysis curve and energy-saving advantages of single-stage and double-effect MVR system were obtained by comparing with the single stage system. The results showed that the COP of the single-stage and double-effect MVR system reached 25 when the pressure ratio was higher than 1.9; the COP decreased significantly with the increase of the pressure ratio and evaporation temperature. The COP decreased by 4.4% and 3.1%, respectively, with the pressure ratio raise in 0.1 and the first effect evaporation temperature increase 10 oC.