Design and evaluation of gaseous tritium recovery system using commercially available membrane type dehumidifier

Figures & data

Figure 1. System flow of test apparatus.

Table 1. Operating conditions.

Item	Actual system	Mockup system
Feed pressure (MPa(G))	0.6–0.8	0.6–0.8
Permeate side pressure (MPa(G))	0.1	0.1
Treatment flow rate (m^3(NTP)/h)	200–300	18–27
Number of applied modules	12	1

Figure 2. Transitional change of the dew point under PID control operation.

Figure 3. Transitional change of the dew point under fixed purge ratio operation at (1) 0.6 MPa(G) and (2) 0.8 MPa(G).

Figure 4. Transitional change of the dew point under optimal fixed purge ratio operation.

Figure 5. Detailed transitional change of the dew point upon an increase in purge gas flow rate (1) with overshooting and (2) without overshooting.

Figure 6. Detailed transitional change of the dew point upon an increase in purge gas flow rate (1) with undershooting and (2) without undershooting.

Figure 7. Differential model for membrane dehumidifier module.

Figure 8. Relationship between dew point and purge ratio at (1) 0.6 MPa(G), (2) 0.7 MPa(G), and (3) 0.8 MPa(G).

Figure 9. Relationship between penetration gas flow rate and purge ratio.

Figure 10. Relationship between moisture recovery ratio and purge ratio at (1) 0.6 MPa(G), (2) 0.7 MPa(G), and (3) 0.8 MPa(G).

Figure 11. Dependency of product gas dew point on inlet moisture concentration.

Figure 12. Axial distribution of moisture concentration inside and outside a hollow-fiber membrane module at 0.8 MPa(G).

Figure 13. Design and flow of detritiation system for the LHD.

Table 2. Design conditions.

Treatment flow rate (m^3(NTP)/h)	300 (max.)
Operation time (h/year)	4,000
Tritium generation rate (GBq/year)	55.5
Tritium conc. in treatment gas (Bq/cm^3)	0.05
Tritium recovery rate (%)	≥95
Humidity of treatment gas (ppm)	1,000 (min.)

Table 3. Design specifications for the system with the membrane module.

Component	Spec.	Number	Size (mm)
Compressor	Inverter control 300 m^3(NTP)/h at 0.8 MPa(G)	1	1,780×980 × H 2,100
Air tank	0.7 m^3	1	OD 800×H 2,000
Membrane	UM-C10	12	OD 90×H 1,110

Table 4. Design specifications for the system with the MS adsorption column.

Component	Spec.	Number	Size (mm)
MS column	MS-5A, 1,300 kg	4	OD 1,630×H 2,800
Blower	300 m^3(NTP)/h at 20 kPa	1	1,360×600×H 720