TY - JOUR
TI - Energy savings and emission reductions in industrial boilers
AU - Saidur Rahman
JN - Thermal Science
PY - 2011
VL - 15
IS - 3
SP - 705
EP - 719
PT - Article
AB - In this paper energy use of boiler fan motors has been estimated using energy  audit data. Energy savings using VSD by modulating fan speed has been  estimated as well. Bill savings and associated emission reductions using VSD  have been estimated and presented in this paper. It has been found that  139,412 MWh, 268,866, 159,328 MWh, and 99,580 MWh electrical energy can be  saved for 40%, 60%, 80% and 100% motor loadings, respectively for 60% speed  reduction. Corresponding bill savings for the aforementioned energy savings  have been found to be US$7,318,335, US$14,113,933, US$8,363,812, and  US135,911,944 for 40%, 60%, 80% and 100% motor loadings, respectively for 60%  speed reduction. Along with energy savings, 69,770,744 kg, 134,558,329 kg,  79,738,065 kg, 49,836,603 kg of CO2 emission can be avoided for the  associated energy savings as a result of energy savings using VSD for 40%,  60%, 80% and 100% motor loadings. Moreover, 32,503,558 GJ of fossil fuel can  be saved for the flue gas temperature reduction as a result of reducing fan  motor speed reduction. Flue gas energy savings for oxegen trim system has  been estimated and found to be 549,310,130 GJ for 16.9% of excess air  reduction with payback period less than a day.