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Waste Heat Recovery Air Compressor Economic Benefit Analysis

Time: 2021-12-27 17:58:54

Air compressor through the air cooler or water cooler to discharge a large amount of waste heat to nature, if we use electric water heater and diesel boiler to heat these heat required electricity and oil costs to calculate, we can clearly know the value of these waste heat.

Below we use a 100HP (75kW) air compressor, working 8 hours a day, 300 days a year to calculate.

100HP air compressor, power 75kW, oil flow 75L/min, oil temperature 80℃, cooling temperature 58℃
Heat generated :75× (80-58) ×0.45×0.85×60=37868kcal/hr

  1. The amount of heat required by the electric water heater to heat the air compressor for a year is calculated according to 0.8 yuan per kilowatt hour, and the efficiency of the electric water heater is 80%, which needs to be used:
    1 KWH = 1 KWH = 860.42 kcal
    37868 kcal ÷ (860.421 kcal/degree ×0.8) ×0.8 yuan/degree =44 yuan/hour
    Based on 8 hours a day, 300 days a year: 44×8×300=105600 yuan

  2. The calorific value of diesel oil is 1×104 kcal per kilogram, and the total efficiency of diesel boiler and heat exchanger is calculated with 0.75, so the effective calorific value of diesel oil obtained by combustion of the boiler is about 7,500kcal per kilogram of diesel oil.It takes five kilograms of diesel to generate 37,868 kilocalories.
    Based on 8 hours a day, 300 days a year, 5.5 yuan per kilogram of diesel
    5 kg/h ×8 hours/day ×300 days/year ×5.5 yuan/kg = 66,000 yuan/year

Boiler maintenance and management also need a full-time staff, according to 20,000 yuan a year, the total cost of 66,000 yuan/year + 20,000 yuan/year = 86,000 yuan/year. It can be seen that the energy wasted by air compressors is converted into electricity or oil costs every year. If these heat can be used, no small benefit will be created

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