Power generation system and generating method based on same

A power generation system and generator technology, which is applied in the direction of machines/engines, steam engine devices, combined combustion mitigation, etc., can solve the problems of large heat transfer temperature difference, complicated process, and difficult control, so as to reduce effective energy loss and cold energy. The effect of high power generation efficiency

Active Publication Date: 2015-10-21
SHANGHAI JIAO TONG UNIV
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  • Application Information

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Problems solved by technology

The process of this method is complex and difficult to control
Patent Publication No. CN101806293A, titled "An Integrated Optimization Method for Improving the Efficiency of LNG Cold Energy Power Generation", the method includes a natural gas direct expansion power generation system, a refriger

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  • Power generation system and generating method based on same

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Embodiment 1

[0028] A method for cascade utilization of liquefied natural gas cold energy to generate electricity, the process flow is as follows figure 1 As shown, it includes three parts including the first-stage direct expansion A of the natural gas medium, the first-stage ternary mixed working medium Rankine cycle B, and the second-stage propane working medium Rankine cycle C.

[0029] The molar composition of liquefied natural gas (LNG) at the receiving station is: 91% methane, 5% ethane, 2.5% propane, 1% isobutane, 0.1% isopentane, and 0.4% nitrogen; The volume is 201t / h. The refrigerant selected for the first-stage Rankine cycle is a ternary mixed working medium, which is composed of methane, ethane and propane, and the flow rate is 140t / h; the refrigerant selected for the second-stage Rankine cycle is a single working medium, propane , the flow rate is 76t / h.

[0030] The LNG (first stream I) with an outlet pressure of 10.0MPa (gauge pressure) and -157.4°C from the LNG pump 1 outs...

Embodiment 2

[0035] A method for cascade utilization of liquefied natural gas cold energy to generate electricity, the process flow is as follows figure 1 As shown, it includes three parts including the first-stage direct expansion A of the natural gas medium, the first-stage ternary mixed working medium Rankine cycle B, and the second-stage propane working medium Rankine cycle C.

[0036] The molar composition of liquefied natural gas (LNG) at the receiving station is: 91% methane, 5% ethane, 2.5% propane, 1% isobutane, 0.1% isopentane, and 0.4% nitrogen; The volume is 201t / h, and the refrigerant selected for the first-stage Rankine cycle is a ternary mixed working medium, which is composed of methane, ethane, and propane, and the flow rate is 139t / h; the refrigerant selected for the second-stage Rankine cycle is a single working medium, propane , the flow rate is 96t / h.

[0037] The LNG (first stream I) with an outlet pressure of 10.0MPa (gauge pressure) and -157.4°C from the LNG pump 1...

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Abstract

The invention provides a power generation system and a generating method based on the same. The power generation system comprises a mixed working medium Rankine circulation expansion acting portion, a propane working medium Rankine circulation expansion acting portion and a natural gas direct expansion generating portion. The generating method comprises steps of natural gas medium one-grade direct expansion, first grade Rankine circulation and second grade Rankine circulation. The generating method is advantageous in that based on the principle of energy temperature orientation and step utilization and on the premise that the complexity of the system is not greatly increased, the cold energy of LNG is utilized step by step through two Rankine circulation in series, the loss of available energy can be reduced when the LNG exchanges heat with the Rankine circulation, the generating efficiency using the cold energy is higher. The pressure energy of the LNG can be fully utilized through the disposed natural gas one-grade direct expansion, on the premise that needed pressure can be supplied to a pipe network and users.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and low temperature, and specifically relates to a power generation system and a power generation method based on the system, in particular to a power generation system using a two-stage Rankine cycle of mixed working fluid and propane working fluid to obtain the cooling capacity of liquefied natural gas systems and methods”. Background technique [0002] Liquefied Natural Gas (LNG) is a colorless, odorless, non-toxic and transparent low-temperature liquid formed by deacidification and dehydration of normal temperature natural gas, and then liquefied by freezing process. LNG cold energy mainly refers to the energy recovered during the equilibrium process by using the temperature difference and pressure difference between LNG and the surrounding environment (such as air and sea water). Based on the temperature of LNG at -162°C and the cold content of 840kJ / kg, one ton of LNG arrives on t...

Claims

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Application Information

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IPC IPC(8): F01K23/00F01K25/06F01K25/08F01K27/00
CPCY02E20/16
Inventor 陈煜巨永林
Owner SHANGHAI JIAO TONG UNIV
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