| 摘要 |
In a method of condensate polishing in which substantially all sodium is removed from cation resin during regeneration so that residual sodium cannot be displaced by ammonium ions during service by exhaustion of cation resins by ammonium ions derived from ammonia conditioning of the boiler feedwater, or from any other source there is diverted from the mainflow 10 a pilot flow of feedwater 16 which is continuously fed to a pilot cation resin exchanger 18 containing strongly acidic cation resin. The total flow leaving the pilot exchanger is continuously monitored as is the conductivity of the flow and the results are integrated. A value is derived indicative of the total of sodium ions which have passed in the main service flow. Thus the correct amount of acid required to elute that sodium from the cation resin in the polisher for regeneration can be derived. <IMAGE> |
