Centrifugal Air Compressor Waste Heat Recovery Case Study

Centrifugal Air Compressor Waste Heat Recovery Case Study

The following is a case study of waste heat recovery from centrifugal air compressors:

A power generation company has two C700 Ingersoll Rand 670kW and one C400 Ingersoll Rand 370kW centrifugal air compressors, and the units run continuously for 24 hours. The average valve opening of the two C700 centrifuges is 80%, and the average valve opening of the one C400 centrifuge is 48%, and a large amount of electricity is converted into high-temperature waste heat and discharged through the circulating water cooling system during operation.

Through analysis and evaluation, the company's air compressor system operating characteristics have a good basis for waste heat recovery and utilisation. Therefore, the enterprise carried out the centrifugal air compressor waste heat recovery transformation, used to produce hot water for washing machines required by the enterprise.

The specific process is as follows:

Pre-heater: absorbs the waste heat of the cooling water of the primary and secondary compression of the compressor.

Waste heat recovery machine: absorbs the waste heat of high temperature compressed air produced by three-stage compression.

Heat exchange: hot water is generated by heat exchange through water-water heat exchange and air-water heat exchange.

After the transformation, users can set the constant temperature water production according to the use demand, and the water temperature is adjustable in the range of 50~80℃. The hot water is stored to the holding tank through the insulated pipeline, and when the user needs hot water, the hot water is supplied by the storage tank for hot water to be used in the workshop cleaning machine.

Through the centrifugal air compressor waste heat recovery transformation, the enterprise has achieved the goal of energy saving and emission reduction, reduced energy consumption and costs, and also reduced the impact on the environment.