An LNG cold energy utilization system combined with power generation and natural gas re-liquefaction

doi:10.11949/j.issn.0438-1157.20170110

CIESC Journal ›› 2017, Vol. 68 ›› Issue (9): 3580-3591.DOI: 10.11949/j.issn.0438-1157.20170110

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An LNG cold energy utilization system combined with power generation and natural gas re-liquefaction

QIU Yang¹, PAN Zhen¹, LI Ping², YANG Fan¹, PANG Tianlong³, CHEN Shujun⁴

1 College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China;
2 Department of Chemical Engineering and Environment, Liaoning Shihua University, Fushun 113001, Liaoning, China;
3 Wuhan PetroChina Kunlun Gas Co., LTD, Wuhan 430000, Hubei, China;
4 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

Received:2017-02-06 Revised:2017-04-06 Online:2017-09-05 Published:2017-09-05
Contact: 10.11949/j.issn.0438-1157.20170110
Supported by:
supported by the National Natural Science Foundation of China (51306210).

一种发电和天然气再液化相结合的LNG冷能利用系统

仇阳¹, 潘振¹, 李萍², 杨帆¹, 庞天龙³, 陈树军⁴

1 辽宁石油化工大学石油天然气工程学院, 辽宁抚顺 113001;
2 辽宁石油化工大学化学化工与环境学部, 辽宁抚顺 113001;
3 武汉中石油昆仑燃气有限公司, 湖北武汉 430000;
4 中国石油大学(华东)储运与建筑工程学院, 山东青岛 266580

通讯作者: 潘振
基金资助:
国家自然科学基金项目（51306210）。

Abstract

Abstract:

Aiming at the problem of cold energy recycling, a cold energy utilization system combined with LNG and coal-burning waste gas power generation and natural gas re-liquefaction was proposed and the system was improved. The thermodynamic calculation of the original system and part of the improved system was made. The effects of evaporation pressure and temperature on the thermal performance of the system was analyzed in detail, the influences of natural gas liquefaction rate on the net power output of the system was analyzed. The optimal scope of power cycle optimal evaporating pressure, evaporation temperature and gas liquefaction rate was determined. The results showed that:calculating as the LNG cold energy recovery is 1000 kg·h^-1, the maximum net output of power generation system was 69.6 kW·h, cold energy recovery efficiency was 41.43%; the maximum value of liquefaction system LNG liquefaction rate was 24%; as the system was improved, the net output power and cold energy recovery efficiency of the power generation system increased by 17.85%, the liquefaction rate of LNG liquefaction system was improved to 28%. It provides a new way of thinking for the cold energy utilization in the process of LNG gasification.

Key words: coal-fired waste gas, natural gas, LNG cold energy, organic Rankine cycle, power generation, liquefaction, exergy

摘要：

针对冷能回收再利用问题，提出了一种结合LNG和燃煤废气发电与天然气再液化的冷能利用系统并对系统进行了改进。对原系统和系统改进部分进行了热力学计算，详细分析了蒸发压力、蒸发温度对系统热力性能的影响，分析了天然气液化率对系统净输出功的影响，确定了发电循环的最佳蒸发压力、蒸发温度及天然气液化率的范围。结果表明：以回收1000 kg·h^-1的LNG冷量（火用）计算，发电系统最大净输出功为69.6 kW·h，系统冷（火用）回收效率为41.43%；液化系统LNG液化率最大值为24%；系统改进后，发电系统净输出功和冷（火用）回收效率提高了17.85%，液化系统LNG液化率提高至28%。为日后LNG气化供气过程中的冷能利用提供一种新的思路。

关键词: 燃煤废气, 天然气, LNG冷能, 有机朗肯循环, 发电, 液化, (火用)

CLC Number:

TE09

QIU Yang, PAN Zhen, LI Ping, YANG Fan, PANG Tianlong, CHEN Shujun. An LNG cold energy utilization system combined with power generation and natural gas re-liquefaction[J]. CIESC Journal, 2017, 68(9): 3580-3591.

仇阳, 潘振, 李萍, 杨帆, 庞天龙, 陈树军. 一种发电和天然气再液化相结合的LNG冷能利用系统[J]. 化工学报, 2017, 68(9): 3580-3591.

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An LNG cold energy utilization system combined with power generation and natural gas re-liquefaction

一种发电和天然气再液化相结合的LNG冷能利用系统

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