LNG cold energy power generation and comprehensive utilization system and method for mixed working medium
A technology of mixed working fluid and cold energy, which is applied in the direction of container discharge, steam application, machine/engine, etc., can solve the problems of high temperature of waste heat heat source, low utilization rate of cold energy, and low heat exchange efficiency, etc., to achieve Significant economic and social benefits, high-efficiency thermoelectric conversion, and the effect of realizing thermoelectric conversion
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Embodiment 1
[0087] This embodiment provides a mixed working fluid LNG cold energy power generation and comprehensive utilization system, the system is as follows figure 1 As shown, it includes LNG gasification unit, cold energy delivery unit and cycle power generation unit.
[0088] Along the LNG flow direction, the LNG gasification unit includes a first heat exchange device 1 and a second heat exchange device 2 connected in sequence.
[0089] The cold energy delivery unit includes a fourth heat exchange device 4 and a fifth heat exchange device 5, the fifth heat exchange device 5 is connected to the second heat exchange device 2, and the LNG is sequentially exchanged through the first heat exchange device 1 and the second heat exchange device 2 After the heat is heated, it enters the fifth heat exchange device 5 to exchange heat with the brine.
[0090] The cycle power generation unit includes a power conversion device 9 and a gas-liquid separation device 6. Along the flow direction of ...
Embodiment 2
[0093] Adopt the comprehensive utilization system that embodiment 1 provides to carry out comprehensive utilization to the cold energy of LNG, described comprehensive utilization method comprises:
[0094] (1) The 10MPa, -150°C LNG transported from the LNG receiving station is sent to the first heat exchange device 1, and in the first heat exchange device 1, it exchanges heat with the gas-phase working medium discharged from the gas-phase outlet of the gas-liquid separation device 6, The temperature of LNG after heat exchange is raised to -100°C;
[0095] The heated LNG enters the second heat exchange device 2, and exchanges heat with the mixed working fluid discharged from the outlet of the electric energy conversion device 9 in the second heat exchange device 2. into low-temperature natural gas;
[0096] The gasified natural gas enters the fifth heat exchange device 5 to exchange heat with the 10°C refrigerant ethylene glycol delivered by the cooling user, and the temperatu...
Embodiment 3
[0102] This embodiment provides a mixed working fluid LNG cold energy power generation and comprehensive utilization system, the system is as follows figure 2 As shown, it includes LNG gasification unit, cold energy delivery unit and cycle power generation unit.
[0103] Along the LNG flow direction, the LNG gasification unit includes a first heat exchange device 1 and a second heat exchange device 2 connected in sequence.
[0104] The cold energy delivery unit includes a fourth heat exchange device 4 and a fifth heat exchange device 5, the fifth heat exchange device 5 is connected to the second heat exchange device 2, and the LNG is sequentially exchanged through the first heat exchange device 1 and the second heat exchange device 2 After the heat is heated, it enters the fifth heat exchange device 5 to exchange heat with the brine.
[0105] The cycle power generation unit includes a power conversion device 9 and a gas-liquid separation device 6 . Along the flow direction ...
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