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How do Non-condensable gases escape from geothermal plant?

(a) Air vents

(b) Trap holes

(c) Condenser ejectors

(d) Centrifugal Filters

This question was addressed to me in an internship interview.

My query is from Problems Associated with Geothermal Conversion in chapter Ocean Energy & Geothermal Energy of Energy Engineering

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Correct option is (c) Condenser ejectors

The explanation: The non condensable gas content varies from 0.2 – 0.4 percent depending upon the particular well and its age. The non condensable themselves are mostly CO2 plus varying amount of methane CH4, hydrogen H2, nitrogen, ammonia and hydrogen sulfide. Besides finding way with the fluid into the plant equipment the non condensable partly escape to atmosphere via condenser ejectors.

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