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
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[0084] Example 1
[0085] A mixed working medium cascade power generation and residual cold output system using LNG cold energy, and its process flow is as follows figure 1 As shown, it includes four parts: LNG vaporization side A, first-stage ternary mixed working fluid Rankine cycle B, second-stage ternary mixed working fluid Rankine cycle C and third-stage binary mixed working fluid Rankine cycle D .
[0086] The molar composition of liquefied natural gas (LNG) at the receiving terminal is simplified as follows: 93% methane, 4% ethane, 1.5% propane, 1% isobutane, 0.1% isopentane, and 0.4% nitrogen; LNG used for cold power generation by LNG The evaporation capacity is 191t / h. The first-stage circulating medium in Rankine cycle B is a ternary mixed working 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 ternary mixed working medium Rankine cycle C selects the ternary mix...
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[0094] Example 2
[0095] A mixed working medium cascade power generation and residual cold output system using LNG cold energy, and its process flow is as follows figure 1 As shown, it includes four parts: LNG vaporization side A, first-stage ternary mixed working fluid Rankine cycle B, second-stage ternary mixed working fluid Rankine cycle C and third-stage binary mixed working fluid Rankine cycle D .
[0096] The molar composition of liquefied natural gas (LNG) at the receiving terminal is simplified as follows: 93% methane, 4% ethane, 1.5% propane, 1% isobutane, 0.1% isopentane, and 0.4% nitrogen; LNG used for cold power generation by LNG The evaporation capacity is 191t / h, the first-stage ternary mixed working fluid Rankine cycle B selects the ternary mixed working medium 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; the second-stage ternary mixed wo...
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