Two-Phase (Liquid-Dominated) Systems

Two-phase systems are liquid-dominated systems. In two-phase geothermal systems, the geothermal fluids contain both water and steam at roughly an equal weight ratio (i. e., dryness, x~0.5) at the wellhead. The water phase needs to be removed by a separator, and the steam is piped to the steam turbines (Fig. 3). The separated water can be reinjected directly or, depending on the fluid pressure, can be flashed to produce a lower pressure steam for power generation before being reinjected (Fig. 4).

Two-Phase (Liquid-Dominated) Systems

FIGURE 3 Power cycle for single-pressure hot water or two – phase geothermal systems. B, barometric leg; C, condenser; G, generator; H, hot well; PW, production well; RW, reinjection well; S, separator; ST, steam turbine.

Two-Phase (Liquid-Dominated) Systems

FIGURE 4 Power cycle for dual-pressure hot water or two – phase geothermal systems. B, barometric leg; C, condenser; G, generator; H, hot well; HPS, high-pressure separator; LPS, low – pressure separator; PW, production well; RW, reinjection well; ST, steam turbine.

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