29/09/2004steinbeis transfercentre biomedical engineering 1 ozone-safe innovative system for...
TRANSCRIPT
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
1
OZONE-SAFE
Innovative system for Haemodialysis Equipment
Disinfection
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
2
OZONE-SAFE
Innovative system for haemodialysis equipment disinfection:
Compact, integrated, totally pre-assembled instrument
Easy to be integrated in haemodialysis equipment
Quick installation in little space
Compact container, mounted on table, wall or ground
Electrical / mechanical section easily accessible
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
3
OZONE-SAFE operational requirements
6 Fresenius haemodialysis machines
2 distribution ringpipes: RO water / ozonated water
Ozonated water circulating
Consumption of ozonated water: 6 x 0.6 L/min = 0.216 m3/h
Dose: 3 mg/L ozone in water
Ozone production: 0.65 g/h => 2 g/h designed
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
4
HDM
buffertank
RO-plant
OzoneSafe
HDM
HDM
HDM
HDM
HDM
waste water
tap water
HDM…haemodialysis machine
OZONE-SAFE System Concept
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
5
OZONE-SAFE components
Dry air
Waste water
Heat
Water+ ozone
Feed gas+ ozone
RO water
Ozonegenerator
Contact system
Ozonedestruct.
Haemodialysisequipment
Off-gas
Electric power
Measurement& Control unit
Prototype
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
6
Dielectric barrier discharge
High Voltage Electrode
Discharge Gap Dielectric Barrier
Ground Electrode
High
Voltage
AC
Generator
Micro discharges: Duration 10 ns, Diameter 100 m
~
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
7
OZONE-SAFE ozone generator
High-voltagetransformer
Electricpower
Feed gas+ ozone
Dry air /oxygen
Discharge cell
Coolingsystem
Frequencyconverter
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
8
OZONE-SAFE PrototypeFlow diagram
diaphragmpump
air dryer
air
gas flowmeter filter
0.3, 5
dischargetubes (ozone)
ozoneconc.meter
air + ozone
ozonedestruction backpressure
valve air
membranecontactsystem
pressuresensor
inlet valve
gearpump
waterflow
ringfeed
ring reflux
ROwater
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
10
OZONE-SAFE tests:ozone production
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
0 0,5 1 1,5
air flow SL/min
O3 % wt 1 bar
prod rate g/h 1 bar
O3 % wt 1,7 bar
prod rate g/h 1,7 bar
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
11
OZONE-SAFE tests:test setup
RO water inlet (6 bar gauge)
OZONE SAFE
prototype
V3
V1
V2
Ring pipe
Stub 1
Stub 2
RO water0.5 – 1.5 bar g
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
12
OZONE-SAFE tests:ozone concentration in water, stubs closed
0
2
4
6
8
10
12
0 10 20 30 40 50 60
Cgas [g/Nm³]
Cli
qu
id [
mg
/L]
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
13
OZONE-SAFE tests:typical photometer readout
-0,01
0,09
0,19
0,29
0,39
0,49
0,59
190 210 230 250 270 290 310 330 350
wavelength [nm]
exti
nct
ion
A
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
14
OZONE-SAFE tests:draining via stubs
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7
drain flow [L/min]
Cli
qu
id [
mg
/L]
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
15
-0,05
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
0,4
0,00 100,00 200,00 300,00 400,00 500,00 600,00 700,00
time [s]
exti
nct
ion
OZONE-SAFE tests:ozone conc. in water, step response
29/09/2004 Steinbeis Transfercentre Biomedical Engineering
16
OZONE-SAFEadvantages
• Complete electric and hydraulic system contained in small cabinet
• Gas cylinders for feed gas not required
• Cooling water for ozone generator not required
• Lightweight membrane contactor produces bubblefree ozonated water
• Supply of up to 6 haemodialysis machines with Cliquid > 3 mg/L