Application Research About PVDF Tubular Heat Exchanger In The Waste Heat Recovery

Way for high temperature flue gas waste heat recycling is mature in industrial enterprises.With respect to large number of medium and low temperature flue gas waste heat recycling research,the studyfalls behind obviously,and the development and utilization is insufficient.Florien plastic heat exchanger has unique advantages in the low temperature waste heat recovery and utilization.The paper focuses onindustrial flue gas waste heat,and emphasizes on application researchabout PVDF heat exchanger(聚偏氟塑料换热器)in the low temperature waste heat recovery.The paper analyzes the potential of low temperature flue gas waste heat from the aspects of theory, and then analyzes the heat transfer rule on the flue side and heat absorption rule on the water side in PVDF heat exchanger, and explains the economic performance of PVDF heat exchanger in the low temperature flue gas waste heat recycling. The paper also design the experiment of PVDF heat exchanger in flue gas waste heat recycling, studies economic performance of the heat transfer status of PVDF heat exchanger in different flue gas conditions.The analysis in theory and experiment aspects indicates that the flue gas inlet temperature, cooling water flow, flue gas flow have impact on PVDF heat exchanger. With the increase of cooling water flow and flue gas flow, the ability of heat exchanging in exchanger enhances. With the increase of the flue gas inlet temperature, the ability of heat exchanging in exchanger weakens. In the experiment, the heat releasing of flue gas side, the ability of releasing in latent heat is stronger than sensible heat. In the condition of 83℃ of smoke temperature, 13% of water vapor concentration in flue gas, the proportion of heat releasing of talent heat in flue gas side in exchanger is 65% in total heat releasing, and the proportion of sensible heat is 35%. The experiment indicates that the increase of flue gas flow and cooling water flow result in the increase of exergy from flue gas emission, and the impact of the increase of flue gas flow is greater than cooling water flow. With the increase of the entry gas temperature, the increasing ra nge of entry gas temperature is less than the range of export gas temperature, causing the of exergy from flue gas emission increases first and then begins to decline. Relative to metal exchanger, the PVDF heat exchanger is more suitable for corrosive flue gas waste heat recovery at low temperature. Through the analysis of the heat exchanger efficiency, the payback period of PVDF heat exchanger is 2~3 years, and service life is more than 15 years. Compared with the metal heat exchanger, the PVDF heat exchanger has more advantages.The subject aims at developing low temperature flue gas waste heat recovery device which can meet the requirements of environment and energy conservation, making full use of flue gas low temperature waste heat, enhancing the energy efficiency, fulfilling the urban sustainable development. Urban sustainable development provides sustainable, safe, stable and clean energy supply system, and also provides ecological green livable environment.