Experimental Study On The Integrated Performance Of Heat Exchange And Dust Removal Of Industrial Flue Gas

With the rapid development of economy,energy demand is increasing rapidly.Meanwhile,China’s "multi coal,less oil and less gas" energy structure makes flue gas emissions increasing.The emission of dusty flue gas in the industry not only causes serious air pollution,but also makes the low-grade waste heat directly discharged from the flue gas,which not only pollutes the environment,but also wastes energy.The existing industrial technology is used to separate the heat and dust from the flue gas separately,which makes the area of the equipment large and the cost of investment is high.Therefore,how to efficiently recycle the low grade heat in the flue gas and remove the fine dust in the flue gas is of great significance to the energy saving and emission reduction.Through the experiment of laboratory,preliminary study of inlet velocity,the exhaust pipe insertion depth,pressure drop,dust concentration,inlet temperature,cooling medium flow rate on the heat transfer and dust removal performance of cyclone separator,and then in the industrial field,the pilot experiment on the integration of heat exchange and dust removal in the FCC waste heat boiler incineration flue gas is carried out.The best process parameters are determined in accordance with the actual conditions,and the following conclusions are drawn:1.Under the experimental conditions,the pressure drop of the cyclone separator increases with the increase of inlet velocity,and the ratio of increments is accelerating.The pressure drop increases slightly with the increase of inlet gas temperature.2.Under the experimental conditions,the heat transfer coefficient of cyclone separator increased with cooling medium increased rapidly at first,when the flow rate of the cooling medium approach 0.6 m3/h,the heat transfer coefficient reaches the maximum,then with the increase of cooling medium flow rate,heat transfer coefficient remained basically unchanged.3.Under the experimental conditions,the dust removal efficiency of the cyclone separator increases first and then decreases with the increase of the inlet velocity.When in the conditions of industry sideline experiment,the dust removal efficiency reach the maximum when the inlet velocity is 50 m3/h.4.When in the industry sideline experiment,the recovery rate of condensed water increased with inlet velocity first and then decreased,when the inlet velocity is 80 m3/h reached maximum.The recovery of condensed water increased with the flow rate of the cooling medium.