Category Archives for Waste Heat Recovery

Water Treatment General Considerations

Water treating requirements vary significantly with incoming water quality and the final uses. Water must be treated to economically satisfy the following types of users: 1. Water for cooling in the middle of a superheater: When reducing the temperature in … Continue reading

12. June 2018 by sam
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Heat Recovery Steam Generators

Steam boiler drums and systems should be designed to insure that, with a boiler water total solids content as recommended by the American Boiler Manufacturers Association Standards (ABMA), the boiler carryover will not exceed ½ parts per million (ppm) solids … Continue reading

12. June 2018 by sam
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Economizers and Air Preheaters General Considerations

For economizers and air preheaters on boilers and fired heaters, the pressure drop is normally limited to about 4 inches of water. For Heat Recovery Steam Generators at the back end of gas turbines, the pressure drop superimposed on the … Continue reading

12. June 2018 by sam
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Waste Heat Recovery General Considerations

Some general considerations are: 1. All waste heat recovery options, if installed, should be done with full consideration of: – Simplicity of operations – Ease of maintenance – Prevention of corrosion – Proven technology 2. Dewpoint and corrosion of waste … Continue reading

12. June 2018 by sam
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Waste Heat Recovery Basic Data

For both the waste heat stream, and the stream receiving the heat, the data (in addition to ambient conditions) needed to evaluate waste heat recovery are: • The flow rate • The specific gravity of the fluid • Temperature • … Continue reading

12. June 2018 by sam
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Hydrocracking Waste Heat Recovery

Figure 3300-6 illustrates the principle of power recovery in a Hydrocracker. The 2500 PSIG process streams would have to be let-down through a control valve to lower pressure at three locations. The 3300 kW recovered from the three units shown … Continue reading

12. June 2018 by sam
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Alternative Waste Heat Recovery Systems

Figure 3300-4 shows several alternative waste heat recovery systems available to a Crude Unit. Along with showing the process steam generated on E-68 and E-24, it highlights that: 1. The Crude Fired Heaters, (F10), instead of generating 40,500 pound/hour of … Continue reading

12. June 2018 by sam
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Fired Heaters with Steam Generation and Air Preheat

Figure 3300-3 shows the stack temperature, after a steam generating economizer, being reduced from 700°F to 300°F while heating the combustion air from 60°F to 600°F. Fired Heater efficiency is improved from 79.7% to 89.3%. This is an example of … Continue reading

12. June 2018 by sam
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Fired Heaters With An Air Preheater

Figure 3300-2 shows the stack temperature being reduced from 850°F to 300°F while heating combustion air from 60°F to 750°F. Fired Heater efficiency is improved from 76% to 89.3%.

12. June 2018 by sam
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Fired Heaters with Steam Generation

Figure 3300-1 shows several items: 1. When 150 PSIG steam is generated (F10), the stack temperature is reduced to 450°F. 2. When 600 PSIG steam is generated (F20), the stack temperature is reduced to 600°F. 3. The higher the pressure … Continue reading

12. June 2018 by sam
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