During the food processing, steaming, baking and other processes generate a large amount of humid and hot air. If directly discharged, it will cause energy waste and may affect the surrounding environment. In the ventilation system of food processing plants, plate heat exchangers can recover heat from humid and hot exhaust air for preheating fresh air or heating production water. For example, in the bread baking workshop, plate heat exchangers are used to transfer the heat from the exhaust air to the fresh air entering the workshop, which not only ensures air circulation in the workshop but also reduces the energy consumption of heating the fresh air. In addition, in the ventilation of food cold storage, plate heat exchangers can prevent external hot air from directly entering, reduce the loss of cold storage capacity, maintain a low temperature environment in the cold storage, and reduce the operating costs of the refrigeration system.
Application of waste heat recovery refrigeration in the chemical industry
During the chemical production process, a large amount of waste heat is generated, such as heat dissipation from reaction vessels and exhaust gas from distillation towers. The refrigeration system driven by industrial waste heat can recover and convert this waste heat into cold energy, which can be used for cooling, crystallization, separation and other processes of chemical products. For example, in urea production, the high-temperature gas discharged from the synthesis tower is recovered through a heat exchanger to drive an absorption refrigeration system, providing cooling capacity for the crystallization of urea solution and improving product quality and production efficiency.
The research and development prospects of new technologies for waste heat recovery
Efficient heat exchanger technology: Developing heat exchangers with higher heat transfer efficiency, lower resistance, and smaller volume, such as plate heat exchangers and heat pipe heat exchangers designed with new materials and optimized structures, to improve the efficiency and economy of industrial heat recovery.
Intelligent control system: Develop an intelligent industrial heat recovery control system using technologies such as the Internet of Things, big data, and artificial intelligence. By monitoring and analyzing the thermal parameters in the production process in real-time, automatically adjusting the operating status of the heat recovery equipment, optimizing the control of heat recovery, and improving the stability and energy utilization efficiency of the system.
New energy storage technology: Research and apply new energy storage technologies such as phase change energy storage materials and thermochemical energy storage to solve the problems of industrial waste heat discontinuity and instability. By storing heat during the generation of waste heat and releasing it when needed, flexible utilization of waste heat can be achieved, improving the overall performance of the heat recovery system.
New application areas of waste heat recovery
Data center heat recovery: With the rapid development of data centers, their energy consumption and heat dissipation issues are becoming increasingly prominent. Recovering the waste heat generated by data center servers and other equipment for heating, hot water supply, or preheating of other industrial processes in surrounding buildings, achieving green and energy-saving operation of data centers.
Thermal management of electric vehicle batteries: During the charging and discharging process of electric vehicle batteries, a large amount of heat is generated. Developing an efficient battery thermal management system to recover the waste heat generated by the battery for energy supply to in car heating or other auxiliary equipment can not only improve the performance and lifespan of the battery, but also enhance the overall energy utilization efficiency of electric vehicles.
Industrial waste heat driven refrigeration system: Utilizing industrial waste heat to drive absorption refrigeration, adsorption refrigeration and other systems, providing cooling capacity for the cooling needs in industrial production processes. This method can reduce the energy consumption of traditional electric refrigeration systems, achieve cascade utilization of waste heat, and improve the comprehensive utilization efficiency of energy.
Kiln waste heat recovery and reuse system
The kiln waste heat recovery and reuse system aims to fully utilize the high-temperature heat in the kiln exhaust gas, and achieve a win-win situation of energy conservation and environmental protection through gas stainless steel cross flow heat exchangers. The core of this solution lies in the use of a stainless steel cross flow heat exchanger, which efficiently exchanges heat between high-temperature exhaust gas and cold air, generating hot air that can be reused.
Working principle: The exhaust gas and cold air flow in a cross flow manner inside the heat exchanger and transfer heat through the stainless steel plate wall. After releasing heat from exhaust gas, it is discharged. Cold air absorbs the heat and heats up into hot air, which is suitable for scenarios such as assisting combustion, preheating materials, or heating.
Advantages:
Efficient heat transfer: The cross flow design ensures a heat transfer efficiency of 60% -80%.
Strong durability: Stainless steel material is resistant to high temperatures and corrosion, and can adapt to complex exhaust environments.
Flexible application: Hot air can be directly fed back to the kiln or used for other processes, with significant energy savings.
System process: Kiln exhaust gas → Pre treatment (such as dust removal) → Stainless steel heat exchanger → Hot air output → Secondary utilization.
This solution is simple and reliable, with a short investment return cycle, making it an ideal choice for kiln waste heat recovery, helping enterprises reduce energy consumption and improve efficiency.
Aluminum oxide powder drying waste heat recovery and reuse system
During the drying process of alumina powder, a large amount of high-temperature exhaust gas is generated. If it is directly discharged, it not only wastes heat energy but also increases environmental load. The waste heat recovery and reuse system for drying aluminum oxide powder effectively recovers heat from exhaust gas through a gas stainless steel cross flow heat exchanger, achieving energy-saving and environmental protection goals.
Working principle: The system utilizes a stainless steel cross flow heat exchanger to exchange heat between the high-temperature exhaust gas emitted during the drying process and cold air. The exhaust gas and cold air cross flow in the heat exchanger, and the heat is transferred through the stainless steel plate wall. The cold air is heated into hot air, while the exhaust gas is cooled and discharged.
Program features:
Efficient recycling: The cross flow design has a high heat exchange efficiency, reaching 60% -80%, fully utilizing the waste heat of exhaust gas.
Durable: Made of stainless steel material, it is resistant to high temperatures and corrosion, and suitable for the characteristics of aluminum oxide powder drying exhaust gas.
Widely used: Recycled hot air can be used for preheating raw materials, drying assistance, or heating, reducing energy consumption.
Process description: Drying exhaust gas → Dust removal pretreatment (if necessary) → Stainless steel cross flow heat exchanger → Hot air output → Reuse.
This solution has a compact structure and stable operation, making it a practical choice for recovering waste heat from drying aluminum oxide powder, helping enterprises save energy, reduce emissions, and improve efficiency.