In an ammonia plant, often one or more boilers are kept on standby in case of failure of the operating boiler. By modifying the burner, combustion air supply and boiler feedwater supply, this steam production at standby can be reduced to virtually zero. By installing an automatic control system the boiler can reach full capacity within 12 minutes (Worrell and Galitsky, 2005 p.39).
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| Energy Savings Potential |
Energy savings up to 85% of the standby boiler are achieved by installing the control system and modifying the boiler. Actual figures depend on the use pattern of the boiler (Worrell and Galitsky, 2005 p.39).
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This guide, prepared by Worrell, E. and C. Galitsky, provides detailed information on energy efficiency measures applicable to petroleum refineries, along with their energy and cost implications.
By applying this system, a plant in Netherlands reduced standby steam consumption from a small 40 t/hr steam boiler from 6 t/hr to 1 t/hr. This resulted in energy savings of 57 PJ/year (