Method for identifying the unit causing a raw water leak in a condenser of a thermal power plant

Patent metadata

Field	Value
Publication number	US-11227698-B2
Application number	US-201816772352-A
Country	US
Kind code	B2
Filing date	Dec 14, 2018
Priority date	Dec 15, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

The present invention relates to a method for identifying the unit causing a raw water leak in a condenser of a thermal power plant consisting of n units.

First claim

The invention claimed is:

1. A method for identifying the unit causing a raw water leak in a condenser of a thermal power plant consisting of n units,
wherein n is an integer comprised between 2 and 15,
wherein each of the n units is equipped with a cartridge intended to contain an ion-exchange resin in a volume comprised between 50 and 150 mL,
comprising the following steps:
a) for each of the n units, purifying the ion-exchange resin to be placed in the cartridge;
b) for each of the n units, placing the purified ion-exchange resin obtained from step a) in the cartridge;
c) for each of the n units, passing a volume of condensate comprised between 500 and 1500 L, into the cartridge containing the purified ion-exchange resin put in place in step b);

d) for each of the n units, collecting the ion-exchange resin obtained at the end of step c);
e) for each of the n units, regenerating the ion-exchange resin collected in step d) by elution with an aqueous regeneration solution;
f) for each of the n units, collecting the eluate obtained at the end of step e) followed by determining the nature of the ionic species present in the eluate and the amount of each ionic species present in said eluate; and
g) for each of the ionic species identified in step f), comparing the amounts of the ionic species determined in each of the n eluates.

2. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 1 , wherein the ion-exchange resin has a total exchange capacity greater than 1.0 eq/L.

3. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 1 , wherein the raw water contains Na + and/or Ca 2+ ions, and the ion-exchange resin is a cationic resin.

4. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 3 , wherein step a) is carried out by elution of the cationic resin with a volume of acidic solution at least 2 times the volume of resin.

5. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 4 , wherein the acidic solution is a strong acidic solution which has a concentration of Na + and Ca 2+ ions of less than 1 ppb.

6. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 3 , wherein step e) is carried out by elution of the cationic resin with a volume of aqueous regeneration solution at least 2 times the volume of resin.

7. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 6 , wherein the aqueous regeneration solution is a strong acidic solution which has a concentration of Na + and Ca 2+ ions of less than 1 ppb.

8. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 1 , wherein the raw water contains Cl − ions, and the ion-exchange resin is an anionic resin.

9. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 1 , wherein n is an integer comprised between 3 and 8.

10. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 1 , wherein the cartridge is intended to contain an ion-exchange resin in a volume comprised between 80 and 120 mL.

11. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 1 , wherein in step c), the passed volume of condensate is comprised between 800 and 1 200 L.

12. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 1 , wherein the ion-exchange resin has a total exchange capacity greater than 1.5 eq/L.

13. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 3 , wherein step a) is carried out by elution of the cationic resin with a volume of acidic solution at least 4 times the volume of resin.

14. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 3 , wherein step a) is carried out by elution of the cationic resin with a volume of acidic solution at least 5 times the volume of resin.

15. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 4 , wherein the acidic solution is a strong acidic solution which has a concentration of Na + and Ca 2+ ions of less than 0.5 ppb.

16. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 4 , wherein the acidic solution is a strong acidic solution which has a concentration of Na + and Ca 2+ ions of less than 0.2 ppb.

17. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 3 , wherein step e) is carried out by elution of the cationic resin with a volume of aqueous regeneration solution at least 4 times the volume of resin.

18. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 3 , wherein step e) is carried out by elution of the cationic resin with a volume of aqueous regeneration solution at least 5 times the volume of resin.

19. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 6 , wherein the aqueous regeneration solution is a strong acidic solution which has a concentration of Na + and Ca 2+ ions of less than 0.5 ppb.

20. The method for identifying the unit causing a raw water leak in a condenser of a thermal power plant according to claim 6 , wherein the aqueous regeneration solution is a strong acidic solution which has a concentration of Na + and Ca 2+ ions of less than 0.2 ppb.

Assignees

• Electricite De France

Inventors

• Bourgeois Christophe
• Rioury Estelle

Classifications

• B01J49/07

  containing anionic exchangers · CPC title

• Y02E30/30

  Nuclear fission reactors · CPC title

• G21C17/0225 Primary

  Chemical surface treatment, e.g. corrosion (corrosion prevention in presence of water from scale removal or by modification of the properties of the liquid C02F5/00; inhibiting corrosion by adding corrosion inhibitors C23F11/00) · CPC title

• G21C19/30 Primary

  with continuous purification of circulating fluent material, e.g. by extraction of fission products {deterioration or corrosion products, impurities, e.g. by cold traps (purification of circulating fluid fuels G21C19/50; separation in general B01D)} · CPC title

• B01J49/57

  for anionic exchangers · CPC title