一级高温回热式氨水循环发电系统性能研究

Study on the Performance of First-Level High-TemperatureRegenerative Ammonia Water Cycle Power Generation System

利用一级高温回热式氨水循环发电系统回收柴油机排气余热,以系统热效率作为优化目标,分析蒸发温度、蒸发压力及氨水基液浓度等对氨水循环系统性能的影响。结果表明:保持基液浓度不变,在各蒸发压力下,随着蒸发温度的逐渐升高,透平输出功率先升高,后降低,系统热效率基本呈现先上升后降低的趋势;相同氨水基液浓度下,各蒸发温度下,随着蒸发压力的增大,透平输出功率增大,系统热效率的变化不是单调的,应根据具体情况具体分析;在定蒸发温度和蒸发压力条件下,随着氨水基液浓度的增大,透平输出功率随之降低,系统热效率也随之降低,基本与透平输出功率的变化趋势一致。最优运行工况为氨水基液浓度32%、蒸发压力2.3 MPa、蒸发温度180℃时,系统热效率达到最高值13.34%。

The first-stage high-temperature regenerative ammonia water cycle power generation system was used to recover the exhaust heat of the diesel engine. To improve the system thermal efficiency, the effects of evaporation temperature, evaporation pressure, and ammonia water base liquid concentration on the performance of the ammonia water cycle system were analyzed. The results show that under the same concentration of base liquid and varied evaporation pressure, as the evaporation temperature gradually increases, the turbine output power increases first and then decreases, and the system thermal efficiency basically shows a trend of first increase and then decrease;with the same concentration of ammonia base liquid solution, and varied evaporation temperatures, as the evaporation pressure increases, the turbine output power increases, and the change in system thermal efficiency is not monotonous, and it should be analyzed according to specific situation. Under the conditions of fixed evaporation temperature and evaporation pressure, as the concentration of ammonia base liquid increases, the output power of the turbine decreases, and the thermal efficiency of the system decreases, which is basically consistent with the changing trend of the output power of the turbine. The best operation condition is when the ammonia base liquid concentration of 32%, the evaporation pressure is 2.3 MPa, the evaporation temperature is 180 ℃ , the thermal efficiency of the system reaches the highest value of 13.34%.