Steam - Energy Efficiency Handbook by R. Zeitz

By R. Zeitz

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By R. Zeitz

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Extra resources for Steam - Energy Efficiency Handbook

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Maintain correct cycle of concentration. Maintain tower equipment to run at design conditions. Compressed Air (Chapter 11) KW/100 SCFM (Kilowatts per 100 Standard Cubic Feet per Minute) should be <19 for 100PSI and <24 for 160 PSI. Operate minimum number of compressors for the load. Keep antisurge valves closed. Control antisurge valves with flow rather than pressure. Base load centrifugals and carry swings (types of air compressors) on reciprocal compres­ sors. Reduce the system pressure to the minimum necessary.

These motors represent another exces­ sive energy consumption area. Some surveys have shown as many as 60% of all motors in in­ dustrial facilities to be oversized. Electronic Motor Drives A promising area for saving energy and reducing maintenance is the marrying of energy-efficient electric motors to the latest generation of elec­ tronic motor drives. These drives can make mo­ tors more productive by controlling starting, stopping, speed regulation, reversing and even positioning. The new drives offer protective features for the motor.

Above: Separate steam and elec­ tric cogeneration. Below: Combined industrial steam and electric cogeneration. temperature processes to generate electricity by generating steam in a waste heat (heat recovery) boiler. Sale of Excess Electricity A further economic consideration for Cogenera­ tion is the ability to sell excess power generated to the local utility. Federal regulations, intended to encourage cogeneration, compel the utility to purchase a cogenerator’s excess power at a price determined by the utilities (called “avoided cost”) or cost of power displaced by the cogenerator’s output.

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