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Waste heat recovery

Waste heat recovery

With the rapid development of machinery industry, the source energy crisis and environmental pollution have become a serious problem to be solved urgently in the world. China pays more and more attention to environmental protection, and energy conservation and emission reduction are regarded as the important work of the government.

Air compression equipment consumes high energy and accounts for a large proportion of energy consumption

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(1) Power consumption analysis

According to the statistics of the U.S. Energy Agency, when the air compressor is running, the electric energy actually consumed to increase the air potential energy only accounts for 15% of the total electric energy consumption. About 85% of the electric energy is converted into heat and discharged into the air through air cooling or water cooling

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(2) Thermal energy analysis

These heat are directly discharged, which not only wastes a large amount of heat energy, but also aggravates the "greenhouse effect" of the atmosphere and causes thermal pollution. In fact, 85% of the wasted heat can be recycled by using the air compressor heat recovery technology, which is equivalent to about 60-70% of the shaft power of the compressor.

How to make good use of these waste heat is an important work for enterprises to save energy and reduce emissions. It can create good benefits for enterprises and also contribute to environmental protection.


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Waste heat recovery

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

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Principle and Application

The waste heat recovery of air compressor is to recover and utilize the heat generated during the operation of the air compressor, mainly to recover the heat generated by the conversion of electrical energy into mechanical energy of the air compressor.

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The heat generated during the operation of the air compressor can be recovered by hrs (waste heat recovery system). The hot water is directly discharged to the insulation water tank through the circulating pump. If hot water is needed, it is directly taken from the insulation water tank through the hot water pump.

Ruiqi science and technology air compressor waste heat recovery unit is a new type of waste heat utilization equipment. As the main role of waste heat recovery, it uses the high-temperature oil and gas heat of the compressor to collect the heat generated during the operation of the air compressor through energy exchange and energy saving control, and improve the operating conditions of the air compressor. It is an energy-saving equipment with waste heat utilization and zero cost operation.


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Application of air compressor waste heat recovery system

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Characteristics of waste heat recovery system of air compressor

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● Make the air compressor "work at constant temperature" (equivalent to water cooling works for the air compressor)

● Extend the "service life" of air compressor

● Improve the "pumping capacity" of the air compressor

● Provide continuous "hot water" (domestic water or industrial water)

● Extend the replacement cycle of "consumables" of the air compressor.

空压机余热回收系统的优势

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Application examples

Parameter table of heat production water volume of waste heat recovery system of screw air compressor:

(the operating pressure of the air compressor is greater than 7.6kgf/cm2)

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Calculation of heat production water of waste heat recovery system of screw air compressor: ※ 100hp (75kW) air compressor.

※ one 100hp (75kW) air compressor.

※ operation time: 24 hours.

※ temperature rise 20 ℃ - 55 ℃ (see table for water yield). 
※ water consumption per barrel is 20L / person / day. 
Water yield q = 24 hours / day × 1.92m3/h = 46m3 / day = 46t / day.

Number of water users n = 46m3 / day ÷ 20L / person · day = 46000l / day ÷ 20L / person · day = 2300 people.
The 100hp air compressor can meet the water consumption of 2300 people for 24 hours.

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