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7/29/2019 Chetan Ad Materials

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ADVANCE MATERIALS USAGE & ITS BENEFITSIN

ULTRA SUPER CRITICAL TECHNOLOGYAPPLICATION IN

COAL BASED POWER PLANTS

GROUP No:10

Chetan Patil (12126008)

Vivek Deshmukh (12126009)

Sitikantha Das (12126028)IIT ,KANPUR

Submitted to:

Prof . Anish Upadhyaya


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In the 21st Century, the world facing the critical

challenge of providing abundant, cheap electricity

to meet the needs of a growing global population &

economy .

Technical constraints in traditional technology

from material POV .

Need of advance materials .


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Heat absorption in differentstages in super critical boilers


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Advance alloy used presently inUSC


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ALLOWABLE STRESS AS FUNCTION OF TEMPERATURE FOR ALLADVANCE ALLOYS

Actual stresses at several steam pressures The nickel-based alloys Inconel

740, Haynes 230,Inconel 625, Inconel 617, and HR 120 have much higher

temperature capability, in decreasing order as listed compared to austenitic

steels, followed by the ferritic steels.


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Scope of advance material

usage

Evaluation includes

Mechanical properties

Steam-side oxidation

Fireside corrosion

Weldability

Fabricability

Review of applicable design codes and standards


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Creep strength:

100,000 hr rupture life for Nickel

based tubing and plates .

CCA 617 shows improved strength

compared to ordinary 617

Inconel 740 shows heat to heat

and heat treatment variations.

Heat B has 100Mpa 100000 Hrrupture life at temperature 760 C

which meets the aggressive

strength requirements .

MECHANICAL PROPERTIES


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All of the austenitic and Ni-

based materials tested formed a

dense layer of chromium oxide

that will result in low oxidation

rates at this temperature &enhanced tube life .

Among the diffusion coatings

tested, SiCr and FeCr coatings

perform much better than AlCr

coatings.

STEAM SIDE OXIDATION PREVENTION


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The testing involved the

corrosive environmentsrepresentative of different coal

types depending on the coarse

& constituents (moisture

%,sulphur% & ash %)

Corrosion behaviour is a

function of Cr level, with

corrosion decreasing rapidly as

the chromium level increased

to 22-27%.

Diffusion coatings of Cr and

Cr-Si displayed better

corrosion resistance than Al-Cr

and were comparable to weld

Fire side corrosion Resistance


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Preliminary results indicate that submerged arc welding

(SAW), a high deposition rate process favoured by boilermanufacturers for thick sections, might not be feasible for Ni-

based materials;

Tests on Haynes 230 and Inconel 740 have beenunsuccessful.

Hot wire gas tungsten arc welding tests conducted on 2-

inch thick Inconel 740 plates using a 25% Helium/75% Argon

shielding gas and matching filler wire gives encouraging

results.

An orbital gas-tungsten arc welding (GTAW) process has

been qualified for Super 304H

WELDABILITY PERFORMANCE OF ADVANCE ALLOYS


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Fabrication capabilities with alloys of interest for an USC steam boiler


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FERRITIC STEEL OR AUSTENITIC STEEL TUBES AFTER 1YEARS OF USAGE

NICKEL ALLOY STEEL TUBES AFTER 1 YEARS OF USAGE


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Efficiency improvement of pulverized coal-

fired power plants by as much as 9 %(from

35% to 45%)

Reduction of CO2 emissions by about 22%

compared to current subcritical steam

power plants & by increasing the operating

temperature and pressure to 760C(1400F) and 35 Mpa.

Less fuel consumption, Less Operation &

maintenance cost

BENEFITS


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References

www.asminternational.org

www.netl.doe.gov/publications/factsheets/project/proj463.pdf

www.fwc.com/publications/tech_papers/files/TP_CCS_07_04.pdf

asminternational.org/portal/site/csc/Details/?vgnextoid...

www.power.alstom.com
http://www.asminternational.org/http://www.netl.doe.gov/publications/factsheets/project/proj463.pdfhttp://www.netl.doe.gov/publications/factsheets/project/proj463.pdfhttp://www.fwc.com/publications/tech_papers/files/TP_CCS_07_04.pdfhttp://www.fwc.com/publications/tech_papers/files/TP_CCS_07_04.pdfhttp://www.asminternational.org/portal/site/csc/Details/?vgnextoidhttp://www.asminternational.org/portal/site/csc/Details/?vgnextoidhttp://www.power.alstom.com/http://www.power.alstom.com/http://www.asminternational.org/portal/site/csc/Details/?vgnextoidhttp://www.asminternational.org/portal/site/csc/Details/?vgnextoidhttp://www.asminternational.org/portal/site/csc/Details/?vgnextoidhttp://www.asminternational.org/portal/site/csc/Details/?vgnextoidhttp://www.fwc.com/publications/tech_papers/files/TP_CCS_07_04.pdfhttp://www.fwc.com/publications/tech_papers/files/TP_CCS_07_04.pdfhttp://www.netl.doe.gov/publications/factsheets/project/proj463.pdfhttp://www.netl.doe.gov/publications/factsheets/project/proj463.pdfhttp://www.asminternational.org/


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