The biomass pellet hot air furnace will generate a lot of waste heat during operation, and it is of great significance to effectively recycle it. The following is an optimization plan for the waste heat recovery system.
First, the key is to reasonably design the structure of the waste heat recovery device. Use efficient heat exchangers, such as finned tube heat exchangers or heat pipe heat exchangers. Finned tube heat exchangers increase the heat transfer efficiency by increasing the heat exchange area; heat pipe heat exchangers use their unique heat transfer principle to achieve rapid heat transfer under a small temperature difference. Optimize the pipeline layout of the heat exchanger to ensure that the hot air has a long enough contact time and sufficient contact area with the heated medium, so as to maximize the recovery of heat.
Secondly, select a suitable heated medium. It can be water, air or other process fluids. If water is used as the medium, the recovered heat can be used for heating, domestic hot water supply or preheating in industrial production. By accurately calculating the water flow and temperature change requirements, matching the waste heat output of the biomass pellet hot air furnace, efficient use of heat is achieved. For air medium, the preheated air can be sent back to the hot air furnace to assist combustion, improve combustion efficiency, and reduce the consumption of biomass pellets.
Furthermore, an intelligent control system is introduced. According to the operating status, waste heat temperature and flow rate of the biomass pellet hot air furnace, the operation of the waste heat recovery device is adjusted in real time. For example, when the hot air furnace load is low and the waste heat temperature is not high, the flow rate of the heated medium is appropriately reduced to ensure the heat exchange effect; when the waste heat temperature is too high, the cooling system or bypass valve is automatically adjusted to prevent equipment damage and ensure stable heat recovery.
In the waste heat transportation link, optimize the insulation measures of the pipeline. Use high-quality insulation materials such as rock wool and polyurethane foam to reduce heat loss during transportation. At the same time, reasonably plan the direction of the pipeline to avoid too long transportation distance and too many elbows, reduce thermal resistance, and improve waste heat transportation efficiency.
In addition, consider the multi-stage utilization of waste heat. For example, first use high-temperature waste heat to generate high-temperature steam to drive steam turbines for power generation or for high-temperature process requirements in industrial production; then use the waste heat after steam condensation to heat water or air, realize the cascade utilization of energy, and further improve the waste heat recovery rate.
Regularly maintain and clean the waste heat recovery system. Prevent scaling and clogging on the heat exchanger surface, which will affect the heat exchange efficiency. Develop a detailed maintenance plan, including checking whether the pipe connection is loose, whether the valve is working properly, whether there is impurity accumulation inside the heat exchanger, etc., and clean and repair it in time.
By optimizing the biomass pellet hot air furnace waste heat recovery system in terms of structural design, selection of heated media, intelligent control, pipeline insulation, multi-stage utilization and maintenance, the waste heat recovery efficiency can be significantly improved, energy consumption can be reduced, and the economy and environmental protection of the entire hot air furnace system can be improved.
