TEA Dilution Process

Study Notes

NAOU-1797 receives 100% TEA from an off-site supplier via tank truck.
The 100% TEA and C24-C28 diluent from Unit 1795 TK-52 are pressured into D-700 (Catalyst Storage Drum) by blocking in the suction valve on P-700A/B (Catalyst Transfer Pumps) and routing it backward through the suction line.
The 100% TEA is diluted to a 25% blend with C24-C28 diluent.
Mixing occurs in D-700 with P-700A/B using internal eductors Z-700A-F (Catalyst Storage Drum Eductors).
E-700 (Catalyst Storage Drum Plate Coil) maintains the temperature of the 25% TEA blend using 100 psig steam.
Steam condensate from E-700 is routed to the Steam Condensate Header.
The 25% TEA blend is pumped by P-700A/B to TK-710A/B (Catalyst Mix Tanks).
More C24-C28 is added in TK-710A/B to reduce the TEA strength to 5 wt%.
Internal mixers M-710A/B (Catalyst Mix Tank Mixers) are used in TK-710A/B.
E-710A/B (Catalyst Mix Tank Plate Coils) maintain the temperature of the 5 wt% TEA blend, using 100 psig steam.
Steam condensate from E-710A/B is routed to the Steam Condensate Header.
E-711A/B (Catalyst Mix Tank Bayonet Exchangers) are used in cold weather emergencies if E-710A/B fails or can't supply enough heat.
The 5 wt% TEA blend is pumped by P-710A/B (Catalyst Transfer Pumps) to D-210 after mixing in TK-710A/B, ensuring constant feed for R-201-205.
E-210 (Catalyst Surge Drum Plate Coil) maintains the temperature of the 5wt% TEA blend using 60 psig steam.
Steam condensate from E-210 is routed to the Steam Condensate Header.
An 80-85 psig nitrogen dry gas seal is maintained on D-210.
D-700 and TK-710A/B have nitrogen blankets on pressure control.
Vapors from D-700 and TK-710A/B are routed through D-701 (Catalyst Vent K.O. Drum) to the catalyst burn pit.
A C16 material level in D-701 seals the vent system, preventing air and moisture from entering and reacting with the TEA catalyst.
NOTE: E-711A/B are normally blinded from service due to the risk of tube rupture and 100-psig condensate leaking into the 5wt% TEA blend.
High TEA concentrations react violently with water.
Low TEA concentrations mean the TEA is deactivated.

D-700 (Catalyst Storage Drum)

D-700 (12’D x 35’6”L) is equipped with a plate coil and eductors.
D-700 receives 100% TEA from an off-site supplier and mixes it with C24-C28 to create a 25% dilution.
100% TEA and C24-C28 enter the top of the drum.
25% TEA exits the top of the drum.

Z-700A-F (Catalyst Storage Drum Eductors)

Z-700A-F are installed to keep the TEA and C24-C28 diluent mixture blended inside of D-700.

E-700 (Catalyst Storage Drum Plate Coil)

E-700 maintains the temperature of the TEA and C24-C28 diluent mixture inside of D-700 using 100 psig steam as the heating medium.

P-700A/B (Catalyst Transfer Pumps)

P-700A/B are single-stage centrifugal pumps.
They are driven by 24.5 HP 3440 RPM horizontally-mounted, induction electric motors.
They transfer the catalyst blend mixture from D-700 to TK-701A/B.

TK-710A/B (Catalyst Mix Tanks)

TK-710A/B (20’D x 40’L) is equipped with a cone roof, plate coils, and mixers.
TK-710A/B are installed to mix the 25% TEA with C24-C28 to a dilution of 5 wt%.
The 25% TEA and the C24-C28 enter the bottom of the tank.
The 5% TEA exits the bottom of tank.

M-710A/B (Catalyst Mix Tank Mixers)

M-710A/B mix the 25% TEA with C24-C28 inside of TK-710A/B.
M-710A/B are driven by 2HP 1540 GPM induction electric motors.

E-710A1/A2/B1/B2 (Catalyst Mix Tanks Plate Coil)

E-710A1/A2/B1/B2 maintain the temperature of the 5wt% TEA blend inside of TK-710A/B using 100 psig steam as the heating medium.

E-711A/B (Catalyst Mix Tank Bayonet Exchangers)

E-711A/B maintain the temperature of the 5wt% TEA blend inside of TK-710A/B using 100 psig steam as the heating medium.
These exchangers are used only during cold weather in emergency situations when the plate coil cannot supply enough heat or if a failure occurs in E-710A/B.

P-710A/B (Catalyst Transfer Pumps)

P-710A/B are single-stage centrifugal pumps.
They are driven by 15 HP 3500 RPM horizontally-mounted, induction electric motors.
They transfer the 5wt% TEA from TK-710A/B to D-210.