Parameters Analysis of a Cascade Ethylene-Propane Rankine Cycle with Cold Energy Recovery of LNG

2012 ◽  
Vol 446-449 ◽  
pp. 2895-2899
Author(s):  
Hong Mei Zhu ◽  
Heng Sun ◽  
Hong Wei Liu
Keyword(s):  
High Pressure ◽  
Energy Recovery ◽  
Rankine Cycle ◽  
Primary Energy ◽  
Parameter Analysis ◽  
Operating Pressure ◽  
Cascade System ◽  
Power Cycle ◽  
Cold Energy ◽  
Parameters Analysis

A cascade ethylene-propane Rankine power cycle that can recover LNG’s cold energy is represented. It is rather appreciated for a CCHP system which uses LNG as the primary energy due to the relatively low operating pressure of the cascade system. The parameter analysis is done for the key process parameters which mainly affect the performance of the system. The results show that the performance can be improved by decreasing the low pressure of the ethylene cycle and increasing the high pressure of the propane cycle. The optimized parameters can obtain 7.43% more electric power and 2.4% more cooling energy.

Exergy Analysis of Cascade Ethylene-Propane Rankine Cycle with Cold Energy Recovery of LNG

2012 ◽  
Vol 170-173 ◽  
pp. 2489-2493 ◽  
Author(s):  
Hong Mei Zhu ◽  
Hong Wei Liu ◽  
Heng Sun
Keyword(s):  
Low Temperature ◽  
Exergy Analysis ◽  
Rankine Cycle ◽  
High Energy ◽  
Primary Energy ◽  
Exergy Loss ◽  
Operating Pressure ◽  
Power Cycle ◽  
Cold Energy ◽  
Exergy Losses

Cascade Rankine power cycle is suitable for cold recovery in a CCHP system which uses LNG as the primary energy. It has the advantages of low operating pressure and high energy efficiency. Exergy analysis of a typical cascade ethylene-propane Rankine power cycle is conducted. The results show that the exergy losses mainly occur in the low temperature part of the cycle. The exergy loss in the LNG-ethylene heat exchanger could reach about 46% of the total exergy loss. Therefore, the reduction of the exergy losses in the low temperature is important for the improvement of the performance of cascade power cycle.

Study on a Cascade Utilization of Liquid Natural Gas (LNG) Cold Energy for Power Generation

2010 ◽  
Author(s):  
Yuanwei Lu ◽  
Hongchang Yang ◽  
Chongfang Ma
Keyword(s):  
Natural Gas ◽  
Energy Recovery ◽  
Cold Water ◽  
Rankine Cycle ◽  
Clean Energy ◽  
Electricity Production ◽  
Power Cycle ◽  
Cycle System ◽  
Cold Energy ◽  
Liquid Natural Gas

Liquefied natural gas (LNG) is known as a clean energy source which is widely used in electricity generation and daily living for its friendly environment performance. The global LNG trade has increased rapidly during recent years. Liquid natural gas delivered by sea-ships contains considerable cryogenic exergy which can be utilized for electricity production before its evaporation and introduction into the system of pipelines. Because the need to vaporize LNG offers a thermal sink at a very much lower temperature than seawater, using this thermal sink both power and gas can be produced. So it is possible to recover power from the vaporization of LNG. Based on the exergy analysis of normal Rankine power cycle and LNG gasification characteristics at a different pressure, this paper proposed a cascading power cycle with LNG cold energy recovery, in which a three-tier Rankine cycle system was established to recovery the liquid heat and latent heat of LNG, and the residual sensible heat of LNG vapor can be used to prepare the cold water of central air-conditioning in plant area. The simulating results showed that the cascade power system can improve the LNG cold energy recovery efficiency.

Process Simulations of the Cold Recovery Unit in a LNG CCHP System with Different Power Cycles

2011 ◽  
Vol 90-93 ◽  
pp. 3026-3032
Author(s):  
Heng Sun ◽  
Hong Mei Zhu ◽  
Hong Wei Liu
Keyword(s):  
Energy Efficiency ◽  
High Efficiency ◽  
Rankine Cycle ◽  
Primary Energy ◽  
Combined Cycle ◽  
Power Cycles ◽  
Power Cycle ◽  
Recovery Unit ◽  
Cold Energy ◽  
Cooling Media

A CCHP system using LNG as the primary energy should integrate cold recovery unit to increase the total energy efficiency. A scheme of CCHP consisting of gas turbine-steam turbine combined cycle, absorption refrigeration unit, cold recovery unit and cooling media system is a system with high efficiency and operation flexibility. Three different power cycles using the cold energy of LNG is(are 或 were) presented and simulated. The results show that the cascade Rankine power cycle using ethylene and propane in the two cycles respectively has highest energy efficiency. However, the unit is most complex. The efficiency of ethylene Rankine power cycle is little lower than the cascade one, and is much higher than the traditional propane Rankine cycle. The complexity of ethylene cycle is identical to that of the propane cycle. The ethylene Rankine power cycle is the referred method of cold recovery in a CCHP system based on overall considerations.

Experimental study of organic Rankine cycle with three-fluid recuperator for cryogenic cold energy recovery

Energy ◽  
2021 ◽  
pp. 122550
Author(s):  
Zhen Tian ◽  
Wanlong Gan ◽  
Zhixin Qi ◽  
Molin Tian ◽  
Wenzhong Gao
Keyword(s):  
Experimental Study ◽  
Energy Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Cold Energy

A LNG Driven CCHP System with a Cold Energy Recovery Device

2011 ◽  
Vol 71-78 ◽  
pp. 1769-1775
Author(s):  
Heng Sun ◽  
Hong Mei Zhu ◽  
Dan Shu
Keyword(s):  
Rankine Cycle ◽  
High Energy ◽  
Primary Energy ◽  
Industrial Applications ◽  
Combined Cycle ◽  
Utilization Efficiency ◽  
Absorption Refrigeration ◽  
Cold Energy ◽  
Very High Energy ◽  
Very High

The CCHP system based on energy cascade utilization can get very high energy overall utilization efficiency. When LNG is used as the primary energy of a CCHP system, the higher efficiency can be obtained if the cold energy of LNG is recovered. Three CCHP systems integrated with LNG cold recovery facility are presented which are suitable for different situations. The thermodynamic calculation and analysis of the system consisting of combined cycle generating electricity, the LiBr absorption refrigeration units, the cryogenic Rankine cycle generation system and the cooling medium system were carried out. The results showed that the energy utility efficiency of the electricity generating was 34.78% and the total energy utility efficiency was up to 86.49%. This indicates that this technology have the potential to be employed in the industrial applications.

Analysis and optimization of cascade Rankine cycle for liquefied natural gas cold energy recovery

Energy ◽  
2013 ◽  
Vol 61 ◽  
pp. 179-195 ◽  
Author(s):  
In-Hwan Choi ◽  
Sangick Lee ◽  
Yutaek Seo ◽  
Daejun Chang
Keyword(s):  
Natural Gas ◽  
Energy Recovery ◽  
Rankine Cycle ◽  
Liquefied Natural Gas ◽  
Cold Energy

A novel cryogenic power cycle for LNG cold energy recovery

Energy ◽  
2011 ◽  
Vol 36 (5) ◽  
pp. 2828-2833 ◽  
Author(s):  
Yanni Liu ◽  
Kaihua Guo
Keyword(s):  
Energy Recovery ◽  
Power Cycle ◽  
Cold Energy
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