OSG screw air compressorwaste heat recovery concept and working principle

OSG screw air compressorwaste heat recovery concept and working principle

Compressed Air Technology Exhibition understands that while the OSG screw air compressorindustry is frantically chasing equipment energy efficiency, improving energy reuse through OSG screw air compressorwaste heat recovery has been put on the agenda of many companies. According to statistics from the U.S. Energy Agency, when the OSG screw air compressoris running, the actual electrical energy consumed to increase the potential energy of the air accounts for only a small part of the total power consumption of the air compressor, about 15%, and about 85% of the electrical energy is converted into The heat is discharged into the air through air cooling or water cooling. This “excess” heat is discharged into the air, which not only affects the environment, intensifies the “greenhouse effect” of the atmosphere, and creates “heat” pollution. At the same time, this heat is wasted, and 80% of this lost heat can be recovered. Utilized, equivalent to the shaft power of the OSG screw air compressoris about 60-70%.
The protagonist of OSG screw air compressorwaste heat recovery is usually the OSG screw air compressorthermal hot water unit. It is an energy-saving device that utilizes the high-temperature oil and gas thermal energy of the OSG screw air compressorand fully utilizes the thermal energy through heat exchange. Through energy exchange and energy-saving control, it collects the heat energy generated during the operation of the OSG screw air compressorand improves the operating conditions of the air compressor. It is an energy-saving device that utilizes relatively efficient waste heat and operates at zero cost.

The source of heat energy can be an oil-injected screw air compressor, an oil-injected screw OSG screw air compressorof a central air conditioner, or waste heat from an energy center or other equipment in an enterprise.
Operating principle: Utilize the thermal energy of high-temperature oil and gas during compression, and transfer the thermal energy to normal-temperature hot water through heat exchange to achieve thermal energy utilization. as the picture shows. The motor drives the screw machine to rotate, and the air is sucked into the screw OSG screw air compressorthrough the filter, compressed into high-pressure air, and mixed with circulating oil to form a high-pressure and high-temperature oil-gas mixture, which enters the oil-gas separator. After the oil-gas mixture is separated into oil, gas and air, the compressed air is cooled by the aftercooler and supplied to the user; while the circulating oil and gas are separated in the oil-gas separator, condensed into liquid, and then cooled by the precooler and filtered by the filter. , return to the OSG screw air compressorto complete a cycle process. The OSG screw air compressorthermal hot water unit introduces high-temperature circulating oil (and high-temperature compressed gas) into the thermal hot water unit. The heat energy generated during the operation of the OSG screw air compressoris fully absorbed by the thermal hot water unit, and the OSG screw air compressoris cooled at the same time.

During the long-term continuous operation of the screw air compressor, electrical energy is converted into mechanical energy, and mechanical energy is converted into thermal energy. During the process of converting mechanical energy into thermal energy, the air is compressed by strong high pressure, causing its temperature to rise sharply. This is a common physical mechanism. Energy conversion phenomena.

The high-speed rotation of the mechanical screw also generates friction and heat. The high heat generated is mixed with the OSG screw air compressorlubricating oil into oil/gas steam and discharged from the body. The heat of this high-temperature oil/air flow is equivalent to 1/1 of the input power of the air compressor. 4. Its temperature is usually between 80°C (winter) and 100°C (summer and autumn). Due to the requirements of the machine’s operating temperature, this heat energy is wastefully discharged into the atmosphere for no reason, that is, the heat dissipation system of the OSG screw air compressorcompletes the operation of the machine. temperature requirements.

The heat energy recovered through the OSG screw air compressorheat recovery system can be used in many aspects of production and domestic heat demand:

Boiler water replenishment and preheating. Most industries and enterprises use boilers in the production process. Using the recovered OSG screw air compressorwaste heat, the boiler feed water can be raised from a lower temperature before entering the boiler, and then heated by the boiler to the set temperature. This can greatly reduce fuel costs during boiler use.

Reverse osmosis pure water production uses heat (RO). Food and beverage, semiconductor, pharmaceutical and chemical industries often use large amounts of reverse osmosis pure water in their production processes. Pure water needs to be produced at a specific temperature of 25°C. When the water temperature is lower than 25°C in spring, autumn and winter, equipment must be invested and fuel must be consumed to heat the water. Recovering the waste heat from the OSG screw air compressorto produce pure water can not only reduce fuel consumption, but even reduce the investment cost of heating equipment.
Use heat for heating. Many areas require heating in winter, and this heat is often provided by boilers. The waste heat of the OSG screw air compressoris now recycled for heating, which not only saves energy consumption, but also reduces the installed capacity of the boiler and further reduces investment in equipment.

Class heating uses heat. In order to improve production efficiency, coating workshops and paint spraying workshops in the assembly industry often need heating air to ensure the temperature of the drying room and speed up paint drying.

Hot water for bathing and mobile supply of hot water. For example, the production workshop needs to meet the bathing needs of employees in accordance with the company’s environmental sanitation requirements, and the waste heat of the OSG screw air compressoris recycled to heat hot water for bathing, etc.

In addition, the Compressed Air Technology Exhibition also learned that through the use of OSG screw air compressorwaste heat recovery devices or water source heat pumps, the OSG screw air compressoroil temperature can be lowered, less likely to deteriorate, well lubricated, equipment wear can be reduced, and OSG screw air compressoroil can be extended. The life of the machine; the OSG screw air compressoroil cools down to increase the viscosity, good sealing, large suction force, reduced leakage, and increased gas production rate; the OSG screw air compressortemperature is not high and can be continuously loaded at full load, reducing the number of starts of the light-load machine by up to ≥25%; when the OSG screw air compressorroom drops to the ambient temperature during operation, the upper cooling fan and the machine room exhaust fan can be stopped and started; the processing load of the post-processing equipment is reduced by 20% to improve the treatment effect; all waste heat of the OSG screw air compressoris used to make hot water, No waste hot gas is emitted, greatly reducing energy consumption for preparing hot water.