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Mixed working medium cascade power generation and remaining cooling capacity output system and method utilizing liquefied natural gas (LNG) cold energy

A technology of mixing working fluid and output system, applied in the direction of combined combustion mitigation, machine/engine, steam engine installation, etc., can solve the problems of complex structure, influence of temperature and pressure deviation, huge system, etc., to improve heat exchange matching performance and avoid high The effect of reducing damage and improving cycle efficiency

Active Publication Date: 2017-07-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The integration of multiple cold energy utilization methods makes the whole system relatively large and complex in structure, and when the technology is implemented, the temperature and pressure deviation of the previous stage will have an impact on the subsequent stage, which puts forward higher requirements for the stability of the system

Method used

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  • Mixed working medium cascade power generation and remaining cooling capacity output system and method utilizing liquefied natural gas (LNG) cold energy

Examples

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Embodiment 1

[0085] A mixed working fluid cascade power generation and residual cooling capacity output system using LNG cold energy, the process flow is as follows figure 1 As shown, it includes LNG vaporization side A, the first-stage ternary mixed refrigerant Rankine cycle B, the second-stage ternary mixed refrigerant Rankine cycle C, and the third-stage two-element mixed refrigerant Rankine cycle D. .

[0086] The molar composition of liquefied natural gas (LNG) at the receiving station is simplified as follows: 93% methane, 4% ethane, 1.5% propane, 1% isobutane, 0.1% isopentane, and 0.4% nitrogen; LNG used for cold energy power generation The evaporation capacity is 191t / h, and the first-stage ternary mixed working medium in Rankine Cycle B is selected as the first-stage circulating medium, which is composed of methane, ethylene and propane (the mass percentage of the three is 0.21:0.29 :0.50), the flow rate is 128.7t / h; the second-stage circulating medium in the second-stage ternary...

Embodiment 2

[0095] A mixed working fluid cascade power generation and residual cooling capacity output system using LNG cold energy, the process flow is as follows figure 1 As shown, it includes LNG vaporization side A, the first-stage ternary mixed refrigerant Rankine cycle B, the second-stage ternary mixed refrigerant Rankine cycle C, and the third-stage two-element mixed refrigerant Rankine cycle D. .

[0096]The molar composition of liquefied natural gas (LNG) at the receiving station is simplified as follows: 93% methane, 4% ethane, 1.5% propane, 1% isobutane, 0.1% isopentane, and 0.4% nitrogen; LNG used for cold energy power generation The evaporation capacity is 191t / h, and the first-stage ternary mixed working medium in Rankine Cycle B is selected as the first-stage circulating medium, which is composed of methane, ethylene and propane (the mass percentage of the three is 0.18:0.39 :0.43), the flow rate is 122.8t / h; in the second-stage ternary mixed working medium Rankine cycle C...

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Abstract

The invention relates to a mixed working medium cascade power generation and remaining cooling capacity output system and method utilizing liquefied natural gas (LNG) cold energy. The system comprises an LNG vaporizing side, a primary ternary mixing working medium Rankine cycle, a secondary ternary mixing working medium Rankine cycle and a third-level two-element mixing working medium Rankine cycle. The secondary ternary mixing working medium Rankine cycle is embedded in the primary ternary mixing working medium Rankine cycle, and the third-level two-element mixing working medium Rankine cycle is independent from the primary ternary mixing working medium Rankine cycle and the secondary ternary mixing working medium Rankine cycle. Compared with the prior art, the system has the beneficial effects that the whole LNG cold energy utilizing system structure is not too complex, meanwhile, organic mixing working media are adopted, the available energy loss existing in the heat exchanging process of all links is reduced as much as possible, a refrigerant heat exchanging link is introduced into the system, the cold capacity loss problem caused by the fact that the working media and LNG directly exchange heat with a hot source is relieved, and the cooling capacity acquired from the system by refrigerant can be used for other cold capacity demand approaches.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and low temperature, and in particular relates to a mixed working fluid cascade power generation and residual cooling output system and method utilizing LNG cold energy. Background technique [0002] Liquefied Natural Gas (LNG) is a low-temperature liquid with methane as the main component formed by purifying and liquefying natural gas at normal temperature. Since impurities such as sulfur, carbon dioxide and water have been removed during the liquefaction process of LNG, the pollutant gas emitted after combustion is more than 50% less than that of diesel oil and heavy oil. Therefore, with the increasing awareness of environmental protection, LNG has become a global The first choice for pure, environmentally friendly and pollution-free energy. [0003] LNG is usually used after gasification. Assuming that the temperature of LNG is -162°C, the cooling capacity that will be released when ...

Claims

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Application Information

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IPC IPC(8): F01K25/10F01K23/04
CPCY02E20/16F01K25/10F01K23/04
Inventor 巨永林薛菲尔陈煜
Owner SHANGHAI JIAO TONG UNIV
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