The Sulphidation Behaviour of Vanadium, Niobium and Molybdenum

Strafford, K.N.; Hampton, A.F.; Jenkinson, D.

doi:10.1007/978-94-009-1347-9_16

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“…17 This type of composition, in which the aluminium content was quite low, was used as the basis for all of the early experimental alloys at Newcastle Polytechnic. 18,19 In the initial tests on the cobalt based alloys 18,19 the H 2 S content of the test gas was very high (10%), to give a pS 2 value of 10 -6 atm at 750uC. The water content of the gas was 3%, giving a pO 2 value of 10 -18 atm.…”

Section: British Gas Activities and The Uk University Based Programmementioning

confidence: 98%

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Materials challenges and gasifier choices in IGCC processes for clean and efficient energy conversion

Starr¹,

Cormoş

2011

Materials Research Innovations

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In the 1970 and 1980s, gasifiers were envisaged for synthesising substitute natural gas (SNG) as well for IGCC (integrated gasification combined cycle) systems. Component temperatures were above 700uC, but stainless alloys did not have the required corrosion resistance. Experimental alloys developed in the UK were alumina formers, incorporating Ta, W, and Mo as gettering elements for sulphidation resistance. Sulphidation corrosion is solvable, but attack by HCl in gasification environments seems intractable. The supposed materials problems of gasification, plus the complexity of IGCC, have led to them being sidelined for power generation. However, commercial IGCC plants are not dependent on high temperature materials and offer higher efficiency than Rankine cycle steam. Best near term prospects for IGCC are for CO 2 capture, but this constrains the type of gasifier. Gasifiers incorporating carbon capture and storage produce hydrogen, or with less capture, SNG. Such systems will supply SNG for space heating as well as electricity, and can cope with the intermittency of wind energy. High efficiency IGCCs will need very advanced gas turbines with 100 bar, 1500-1600uC turbine inlet conditions. Key requirements will be thermal barrier coatings and catalytic combustor materials. Such gas turbines would offer efficiencies of 70% in straight CCGTs, or 50% when used in carbon capture IGCCs.

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Section: British Gas Activities and The Uk University Based Programmementioning

confidence: 98%

“…17 Subsequently, the good behaviour of other refractory elements, including Mo, Nb, Ta, W and V, was confirmed by Strafford and colleagues. 18,19 Results for vanadium, molybdenum and niobium at 850 and 950uC in a water free H 2 /H 2 S atmosphere are shown in Fig. 5.…”

Section: British Gas Activities and The Uk University Based Programmementioning

confidence: 98%

Materials challenges and gasifier choices in IGCC processes for clean and efficient energy conversion

Starr¹,

Cormoş

2011

Materials Research Innovations

View full text Add to dashboard Cite

show abstract

The Sulphidation Behaviour of Vanadium, Niobium and Molybdenum

Cited by 1 publication

References 2 publications

Materials challenges and gasifier choices in IGCC processes for clean and efficient energy conversion

Materials challenges and gasifier choices in IGCC processes for clean and efficient energy conversion

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