Process Equipment Update
A steam accumulator in situ
in the boiler output in combination with load stabilisation. In all cases, there are prospects for energy savings emanating from: the elimination of excess steam generating capacity and part-loading that causes a low load factor, the removal of a rapidly fluctuating demand and idle live capacity that increases standing heat and power losses. Therefore the possibility of a steam accumulator meeting a fluctuating steam demand with a smaller boiler operated at a higher load factor and at constant output with higher efficiency is real.
Expectations on energy savings will vary depending upon individual circumstances, so predictions on these and operational gains can only be generalised. However, a conservative expectation of improved combustion efficiency for a modern boiler and burner equipment using the latest accumulator control methods could be between 2 to 4%, and potentially higher for older plant. The data from which to obtain the information will likely be readily obtainable from the existing energy management system but with older plants
20
www.engineerlive.com
where scant information is available, the addition of the necessary instrumentation could easily be acquired.
Standing heat and power losses resulting from excess online steam generating capacity could equate to a further 1 to 3% of maximum boiler rating, again depending on the type and age of the boiler. Where a boiler is of large refractory construction, savings on maintenance could have an even greater impact on the case for investment.
Operational gains
Fewer boilers online-operated under steady load conditions would mean less wear and tear and lower maintenance costs. The potential for labour and material savings may be easily examined but it’s safe to say that a reduction in operating costs would contribute greatly to the decision to invest in the technology of steam accumulation. l
David Oakland is principal consultant at David Oakland Associates, a specialist steam accumulation design provider.
www.steamacc.co.uk
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25