Gas stripper system
A gas stripper system for purification of a primary coolant contaminated in cooling a nuclear reactor is provided. The gas stripper system includes a gas stripper column and a condenser arrangement. The column is adapted to receive the liquid phased contaminated primary coolant. The column defines top, bottom and middle sections and includes a distributor member, a re-boiler member and a separation member disposed therealong. The distributor member, a re-boiler member and a separation member with structured packing are configured such that maximum contact between the liquid phased primary coolant and gaseous phased primary coolant is made. Moreover, the condenser arrangement is configured to the gas stripper column to receive and condense the vapour phased primary coolant.
1. A gas stripper system for purification of a primary coolant contaminated in cooling a nuclear reactor, the gas stripper system comprising:
a column configured to receive a liquid phased contaminated primary coolant, the column comprising:
at least a top section;
a bottom section;
a middle section;
a distributor member disposed in the top section of the column and configured to evenly distribute the liquid phased contaminated primary coolant as it flows from the top section to the bottom section of the column;
a re-boiler disposed in the bottom section of the column configured to heat the liquid phased contaminated primary coolant to a gaseous phase;
a separation element disposed in the middle section of the column, the separation element comprising structured packing;
a condenser configured to receive the gaseous phased contaminated primary coolant, condense the gaseous phased contaminated primary coolant, provide for non-condensable gases to be discharged, and return a condensate to the column; and
a return line provided between the bottom section of the column and the distributor member, and a pump, a heat exchanger, a cooler and a three-way valve along the return line;
wherein the three-way valve is configured to allow impurity-free primary coolant to exit the return line.
2. The gas stripper system as claimed in claim 1 , wherein the distributor member comprises a plurality of conduits arranged in parallel and crosswise manner, each of the conduits comprising an outlet configured to discharge the liquid phased contaminated primary coolant onto the separation element.
3. The gas stripper system as claimed in claim 1 , wherein the re-boiler comprises a plurality of tubes stacked in a circular or rectangular bundle so as to circulate heated fluid to heat the liquid phased contaminated primary coolant at the bottom of the column to convert the liquid phased contaminated primary coolant to the gaseous phase.
4. The gas stripper system as claimed in claim 3 , wherein each of the tubes is U-shaped.
5. The gas stripper system as claimed in claim 1 , wherein the condenser comprises a plurality of tubes that enables a steam/gas mixture of the gaseous phased contaminated primary coolant to be entered therein, wherein in the tubes, a portion of the steam/gas mixture is condensed and non-condensable/radioactive gases are vented.
6. A column for a gas stripper system for purification of a primary coolant contaminated in cooling a nuclear reactor, the column comprising:
a top section;
a bottom section;
a middle section;
a distributor member disposed in the top section and configured to evenly distribute the liquid phased contaminated primary coolant as it flows from the top section to the bottom section;
a re-boiler disposed in the bottom section and configured to heat the liquid phased contaminated primary coolant to a gaseous phase; and
a separation element disposed in the middle section and comprising corrugated metallic sheets and structured packing; and
a return line provided between the bottom section of the column and the distributor member, and a pump, a heat exchanger, a cooler and a three-way valve along the return line;
wherein the three-way valve is configured to allow impurity-free primary coolant to exit the return line.