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