Optimization Design Of Steam Generator For Sulfuric Acid Low Temperature Waste Heat Recovery

As the core equipment in the sulfuric acid low-temperature waste heat recovery device,the steam generator is the key to ensure the reliable,stable and long-term operation of the entire device.In order to improve the efficiency of low-temperature waste heat recovery in the process of sulfuric acid production,this project carried out the design and optimization of the steam generator of an annual output of 600 thousand tons sulfuric acid low-temperature waste heat recovery device,The research content and results are as follows:(1)Based on theoretical analysis of sulfuric acid low-temperature waste heat recovery process flow,steam generator structure principle,performance influencing factors,etc.,the main design parameters of the steam generator are proposed,and the overall structure of the equipment is designed in conjunction with relevant technical standards The calculation results show that the steam generator of the sulfuric acid low-temperature waste heat recovery device designed in this paper can meet the process requirements.(2)In order to improve the heat transfer performance of the steam generator,a typical U-shaped tube in the U-shaped tube bundle was selected as the research object,and the internal mechanism of the improved heat transfer characteristics was analyzed by introducing the pitted tube technology.The numerical results show that the heat transfer capacity of the U-shaped tube is improved by 16.83% after the improved design.If this technology is popularized and applied to the U-shaped tube bundle of the steam generator,the cumulative effect of its heat transfer characteristics will surely greatly improve the heat transfer performance of the steam generator.(3)In order to improve the steam quality at the outlet of the steam generator,the effects of different inlet angles of the cyclone separator and the number of openings of the gas collection pipe on the vapor-liquid separation efficiency were analyzed by numerical simulation.The results show that: when the inlet angle is 45 °and the when the number of openings in the trachea is 4,the three-dimensional flow lines inside the separator are relatively neat,and the airflow is baffled through the arc wall surface to form a relatively strong centrifugal force,which can effectively promote the effective separation of the vapor-liquid two phases.In this paper,the design of the steam generator for the low-temperature waste heat recovery unit with an annual output of 600 thousand tons of sulfuric acid is carried out,and the structure of the heat exchange tube and cyclone separator is optimized in terms of improving heat exchange performance and outlet steam quality,which effectively improves the overall performance of the equipment.The research work carried out in this subject has a role in promoting the development of low-temperature waste heat recovery technology for sulfur-based acids.