Performance Analysis of the Kalina⁃Three⁃Stage Organic Rankine Combined Cycle Based on LNG Cold Energy

doi:10.12422/j.issn.1672-6952.2024.05.013

Abstract

Abstract:

A power cycle (KC-TORC) combining a Kalina cycle and a three?stage organic Rankine is proposed to address the problems of large flue gas discharge with high temperature and low flue gas outlet temperature that is easy to cause corrosion of industrial pipelines in the industrial production process. A circulation system was constructed by using the method of thermodynamic simulation, taking industrial flue gas as the heat source and liquefied natural gas (LNG) as the cold source,and the effects of kalina cycle evaporation temperature, LNG post?pump pressure and three?stage organic Rankine cycle (ORC) turbine inlet temperature on the thermodynamic performance were analyzed by varying the flue gas outlet temperature. The results show that the maximum exergy efficiency is 62.89% at a flue gas outlet temperature of 30 ℃ and a Kalina cycle evaporation temperature of 112 ℃. The maximum thermal efficiency is 32.09% at a flue gas outlet temperature of 120 ℃ and three?stage ORC turbine inlet temperature of 160 ℃, and the net output power can be up to 2.04 MW. The annual NAV could be up to 5.773×10⁶ dollars. The KC?TORC power cycle shows good advantages in thermodynamic and economic aspects, which is important for environmental protection.

Key words: Waste heat recovery, LNG cold energy, Kalina cycle, Organic rankine cycle, Thermodynamic analysis

摘要：

针对工业生产过程中因烟气排量大且温度较高、烟气出口温度过低而易造成工业管道腐蚀等问题，提出了一种卡琳娜循环与三级有机朗肯联合的动力循环（KC-TORC）模型。以工业烟气为热源、液化天然气（LNG）为冷源，利用热力学仿真的方法构建循环系统，改变烟气出口温度，分析了卡琳娜循环蒸发温度、LNG泵后压力和三级有机朗肯循环（ORC）透平入口温度对热力学性能的影响。结果表明，当烟气出口温度为30 ℃、卡琳娜循环蒸发温度为112 ℃时，最大?效率为62.89%；当烟气出口温度为120 ℃、三级ORC透平入口温度为160 ℃时，最大热效率为32.09%，净输出功可达2.04 MW，年度净资产值可达5.773×10⁶美元；KC?TORC在热力学及经济方面具有优势，对环境保护具有重要的意义。

关键词: 余热回收, LNG冷能, 卡琳娜循环, 有机朗肯循环, 热力学分析

CLC Number:

TE09

Xuyang CHEN, Fan YANG, Wenquan JIANG, Haotian ZHENG, Dawei TIAN. Performance Analysis of the Kalina⁃Three⁃Stage Organic Rankine Combined Cycle Based on LNG Cold Energy[J]. Journal of Liaoning Petrochemical University, 2024, 44(5): 90-96.

陈旭阳, 杨帆, 姜文全, 郑皓天, 田大微. 基于LNG冷能的卡琳娜⁃三级有机朗肯循环性能分析[J]. 辽宁石油化工大学学报, 2024, 44(5): 90-96.

Figures/Tables 10

Fig.1 Schematic diagram of the circulation flow of the KC?TORC system

Table 1 Main parameters of the KC?TORC system

参数	数值
烟气入口温度/℃	480
热源流量/（kg·h^-1）	6.12×10⁴
LNG入口温度/℃	-162
LNG流量/（kg·h^-1）	2.88×10⁴
泵等熵效率/%	75
透平等熵效率/%	75
C₆H₁₄流量/（kg·h^-1）	5.4×10³
C₅H₁₂流量/（kg·h^-1）	6.4×10³
C₃H₈流量/（kg·h^-1）	5.4×10³

Fig.2 Effect of Kalina cycle evaporation temperature and flue gas outlet temperature on the net output work of the system

Fig.3 Effect of Kalina cycle evaporation temperature and flue gas outlet temperature on thermal efficiency and exergy efficiency of system

Fig.4 Effect of LNG post?pump pressure and flue gas outlet temperature on the net output work of the system

Fig. 5 Effect of LNG post?pump pressure and flue gas outlet temperature on thermal efficiency and exergy efficiency of system

Fig. 6 Effect of tertiary ORC turbine inlet temperature and flue gas outlet temperature on the net output work of the system

Fig. 7 Effect of tertiary ORC turbine inlet temperature and flue gas outlet temperature on thermal efficiency and exergy efficiency of system

Fig. 8 Percentage of investment costs for each piece of equipment in the KC?TORC system

Fig.9 Percentage of investment cost for each heat exchanger in the KC?TORC system

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