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Integrating and optimizing method for improving generation efficiency of liquefied natural gas cold energy

A technology of liquefied natural gas and power generation efficiency, which is applied in ocean energy power generation, gas turbine devices, machines/engines, etc., can solve the problems of consuming circulating cooling water for cooling, low-temperature waste heat is not utilized, etc., and achieves the improvement of cooling utilization and power generation , Improve the effect of cooling recovery rate

Inactive Publication Date: 2012-03-28
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

At the same time, there is a large amount of low-temperature waste heat in the gas-fired power plant that is not used, but consumes a large amount of circulating cooling water for cooling

Method used

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  • Integrating and optimizing method for improving generation efficiency of liquefied natural gas cold energy
  • Integrating and optimizing method for improving generation efficiency of liquefied natural gas cold energy
  • Integrating and optimizing method for improving generation efficiency of liquefied natural gas cold energy

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Embodiment 1

[0054] Such as Figure 4 As shown, this embodiment is a certain LNG receiving station, 70% of the LNG received by the receiving station is used for power generation, and 30% is used for city gas; there is a 450MW gas-fired combined cycle power plant adjacent to the receiving station, and the LNG enters the delivery pipe after vaporization The pressure of the net is 80kg / cm 2 , while the inlet pressure of the gas turbine in the combined cycle power plant is only 20kg / cm 2 About; the processing capacity of LNG is 150.0t / h, and the molar composition of LNG is: methane 88.78%, ethane 7.54%, propane 2.59%, isobutane 0.56%, n-butane 0.45%, n-pentane 0.01%, nitrogen 0.07% %; Embodiment adopts the integrated optimized power generation process of Rankine cycle and direct expansion combined method of the present invention, to utilize the cold energy and pressure energy of LNG, wherein the refrigerant working medium of Rankine cycle is propane, heating natural gas and Rankine cycle prop...

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Abstract

The invention discloses an integrating and optimizing method for improving the generation efficiency of liquefied natural gas (LNG) cold energy, which comprises a natural direct expansion generating system, a refrigerant Rankine cycle generating system and an ice water system. The method improves the recovery rate of liquefied natural gas cold capacity. By the invention , an ice water cooling system is designed; the cold energy of the LNG is indirectly used for cooling cold water, so that the process not only can save the consumption of sea water of the traditional system, but also can obtaina certain amount of ice water which is provided for an air conditioner for air feeding and cooling, cooling among compressors, air feeding and cooling of combustion gas turbines and the like in plants and buildings in a receiving station area and save the electrical power consumption for compression and refrigeration of the traditional freezing ice water machine. By recycling low-temperature waste heat, the generation efficiency of cold energy of the LNG can be improved; and by introducing the low-temperature waste heat of a gas-fired power plant into a system for heating natural gas and a refrigerant working medium, the invention improves the temperature of the natural gas and the refrigerant working medium entering a turbine expansion machine and thereby improves the generation efficiency of the system.

Description

technical field [0001] The invention belongs to the field of liquefied natural gas (LNG) cold energy power generation, in particular to an integrated method for improving the efficiency of liquefied natural gas (LNG) cold energy power generation. Background technique [0002] Natural gas is an important energy resource to realize high-quality and diversified energy supply in China. According to the national energy strategy plan, about 10 LNG receiving stations will be built in the Yangtze River Delta, Bohai Rim, and Pan-Pearl River Delta regions before 2010 to increase the proportion of natural gas in my country's energy consumption structure. In order to facilitate large-scale storage and ocean transportation, after natural gas is extracted, impurities are usually removed, liquefied at low temperature, and turned into liquid natural gas to improve the efficiency of transportation and storage. Under normal pressure, LNG is a liquid with a temperature as low as -162.0°C. Due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03G7/04F03G7/05F01K25/10F01D15/10F02C6/18
CPCY02E10/34Y02E10/30
Inventor 李亚军金光陈行水
Owner SOUTH CHINA UNIV OF TECH
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