Degas conductivity

Degas conductivity is measured after the water sample has flowed through a resin and has had carbon dioxide removed by a degassing process.

Conductivity measurements in the water/steam cycle of power stations are commonly used as indicators of the quality of the water used in the process.

(Refer VGB-S-010-T-00;2011-12.EN-ebook) (2) Calculated CO2 values (Refer ASTM D4519 Standard) After the ions have been removed from the conditioning of the circulating water (e.g. ammonium NH4+) in the cation exchanger, ions resulting from gaseous components must be removed in order to determine degas conductivity.

Of all gases occurring in the atmosphere, typically only carbon dioxide (CO2) dissolves chemically into ions in circulating water.

[1] Manufacturers of reboiler systems include Swan Analytical, Forbes Marshall, Mettler Toledo, and Sentry Equipment Corp.

Critical for top efficiency is ensuring pure steam reaches the second stage quickly.

That means a gas-turbine combined cycle plant would be burning fuel at 100%, but only achieving a 70% output and venting the excess heat and exhaust.

At $0.50/MW-minute ($30/MWH), a 750MW coal plant starting three hours faster each cycle could theoretically generate an additional $133,875 of annual revenue from the same fuel.

If a dynamic system similar to Gronowski's is used, in the nearly 30 minutes of start-up time saved over a reboiler method, the typical combined cycle plant will generate even more income from the same fuel consumed with each and every system start, especially using typical “peak” electricity pricing.