Post on 21-Jan-2016
description
A.I.BalitskiiKarpenko Physico-Mechanical Institute National Academy of Sciences of Ukraine, Lviv, Ukraine
INFLUENCE OF WORKING HYDROGEN ENVIRONMENTS ON CRACK PROPAGATION IN HIGH
NITROGEN STEELS OF ENERGETIC EQUIPMENTS
PMI-2007
Parameters of hydrogen
and hydrogen-containing environmen
ts in modern
turboagregates with
100…1000 MW output
Hydrogen cooling system of modern turboagregate
Technological scheme of electrolyzer equipment (EU) SEU-4Мх2 with distributed regulators of
pressure and gas washer: 1 – electrolyzer; 2 – distributed columns for hydrogen; 3 – distributed columns for oxygen; 4 – hydrogen washer; 5 – oxygen washer; 6 – hydrogen
pressure regulators; 7 – oxygen pressure regulators; 8 – surge tank; 9 – tank for alkali; 10 – check valve; 11 – refractory; 12 – pump; 13 – expander; 14 – nitrogen manifold; 15 – freezer; 16 – hydrogen for drying; 17- oxygen pressure regulator; 18 - protecting valve. Pipe-line: 4,5 - hydrogen; 4,5пр –
hydrogen blow- through; 3,7 -oxygen; 3,7пр - oxygen blow- through; 5,1 - nitrogen; 1,8 - condensate;
7,2 - electrolyte; 1,2 – cooling water.
Technological scheme of hydrogen drying adsorption equipment: 1 – steam heater; 2 –
dryer; 3 – freezer; 4 – separator; 5 – condensate accumulator; 6 – condensate evacuator; 7 – hydrogen to receivers; 8 – hydrogen from
electrolyzer; Main pipe-line: 4,5 - hydrogen; 1,2 – cooling water; 1,0 – waste water; 2,3 –
overheated steam; 2,0 – waste steam.
Scheme of hydrogen equipment drying cooling method: 1 – flash steam; 2 – expander; 3 – freezer-compressor plant item; 4 – Freon; 5 – to pressure
instrument relay; 6 – to manometer; 7 –to minimum pressure relay; 8 – to monovacuummeter ; 9 –
hydrogen from pressure regulator; 10 – hydrogen to receivers.
Hydrogen distribution through the
pressure vessel thickness (1) and bottom
wall (2) of
distribution hydrogen
electrolyzer
column 0.35
0.45
0.55
0.65
0.75
0.85
0.95
1.05
0 2 4 6 8 10
Δb, mm
CH
, pp
m
1
2
Technological scheme of
hydrogen drying
adsorption equipment:
1 –steam heater;
2 – dryer; 3 – freezer;
4 – separator;
5 – condensate
accumulator;
6 – condensate evacuator;
7 – hydrogen to receivers;
8 – hydrogen from
electrolysers; Main pipe
line: 4,5 - hydrogen; 1,2 –
cooling water; 1,0 –
waste water; 2,3 –
overheated steam; 2,0 –
waste steam.
Technological scheme of hydrogen drying adsorption equipment with vacuum-thermal
sorbent regeneration: 1 –
rotameter; 2 – pressure regulator; 3
– desiccator; 4 – vacuum pump; 5 –
fire stop; 6 – monovakuummetr; 7 – check valve; 8, 15 –
valve stop; 9 – hydrogen from
electrolyses; 10 – hydrogen to до receiver; 11 - в
output in atmosphere; 12 – gas flow direction; 13 -
liquid flow direction; 14 – outage hopper;
16 – reworkable waste valve. Pipe-line: 1,2 – cooling water; 1,0 - outage cooling water; 2,3 - steam; 2,0 – steam
waster ; 4,5 - hydrogen; 4,5пр – hydrogen blow-through; 5,1 –
nitrogen.
Recommended scheme of permanent blowing and automatic hydrogen feeding of generators: 1
– filter; 2 – generator; 3 – regulator; 4, 8 – rotameter; 5 – protecting valve; 6 – reworkable
waste valve; 7 – oil evacuator.
Modern evaporator: 1 –
outer (hydrogen)
zone; 2 – inner (cooling
accumulated) zone; 3 –
serpentane; 4 – gathering
water; 5, 6 - pipes; 7 –
drainage valve; 8 – removing
lid; 9 – pipe; 10 – entrance
liquid Freon; 11, 13 – entrance
hydrogen; 12 - outlet steam
Freon.
Modern scheme of hydrogen drying: 1 – turbogenerator core; 2 – heat exchanger „pipe in pipe”; 3 – evaporator; 4 – gathering water; 5 – pump; 6 – reciver; 7 – thermoregulating valve; 8 – sensitive thermo-vessel; 9 – valve; 10, 11 – pipes; 12 – drainage valve; 13 –temperature relay core ; 14 – magnetic starter electric motor ХКА; 15 – sensitive thermo-vessel relay.
Hydrogen induced damages and cracks locations after long term service
In service control of hydrogen, structure materials and vibration states of FPP and NPP turbogenerators components
UTS after long term service in hydrogen
0
200
400
600
800
1000
1200
1400
σв, МПа σ0,2, МПа 10•δ, % 10•ψ, %
14
17
18
Influence of Influence of electrolyte electrolyte hydrogen saturation hydrogen saturation (strengthening (strengthening levels 14, 17) and levels 14, 17) and gaseous hydrogen gaseous hydrogen on the standard on the standard mechanical mechanical properties of HNSproperties of HNS
Comparison of in service crack propagation velocities and experimental data
Comparison of crack length extension during 1 year
2006 2007
Methodical recommendations of technical state evaluation of turbogenerator rotor retainingrings(normative document SNOU-N TT45.301:2006)/ Loshak O.S., Balitskii A.I., Pulkas L.G., Lozunov S.O., Ripey I.V., Gurina O.V. // Ministry of fuel and energetic of Ukraine.- Decision of Minister N 432, 9.11.2006.- Kyiv, Ukraine, GRIFRE.- 32 PMethodical recommendations of technical state diagnostic and evaluation of life time of steam turbine cast vessel details (normative document)/ Loshak O.S., Balitskii A.I., Pulkas L.G., Lozunov S.O., Ripey I.V., Gurina O.V. // Ministry of fuel and energetic of Ukraine.- Decision of Minister N 124, 1.03.2007.- Kyiv, Ukraine, GRIFRE.- 39 P.
Cryteria of
materials
selections for
advanced
energetic
equipment
50
90
130
170
210
250
Air Hydrogen
K1c*UTS, (MPa)2*m
NitronicCromanite18Mn18Cr