The Influence Rule Of Fouling In Tube To Heat Transfer Of The JIN-91 Steam Generator

Steam flooding is an important technology for the exploitation of heavy oil reservoirs.The steam injection boiler is the core equipment in the heavy oil extraction.The fouling of the furnace tube is the main factor affecting the thermal efficiency of the steam boiler.However,the steam boiler is complicated and fouling.The mechanism of heat transfer is difficult to predict,relying entirely on theoretical analysis and experimental aspects of the study more difficult and it is difficult to grasp the internal fluid mass transfer and heat transfer details.Therefore,based on the computational fluid dynamics software Fluent and Workbench software,it is very important to analyze and analyze the heat transfer analysis of the fouling of the boiler.In this paper,the Jin-91 steam injection boiler is used as the research object,and the scale of the furnace tube is analyzed.The results show that there are many kinds of fouling components in the radiation section,and the thermal conductivity of the different components is different.But the common structural components are mainly carbonate scale and adhere to the inner wall of the furnace tube.In this paper,the fouling of boiler tubes in the radiation section is mainly analyzed.Based on the three thermal conduction laws of engineering heat transfer,the heat transfer law of the furnace tube under the condition of fouling of the furnace tube is analyzed.Considering the characteristics of the combustion system of the steam boiler,the two-dimensional numerical simulation of the combustion of the furnace is carried out.The temperature field distribution in the furnace is obtained by the simulation results,which lays the foundation for the further simulation of the fluid-solid coupling heat transfer.Through the simulation of the fluid-solid coupling heat transfer process of the furnace tube,the change rule of the steam generation quality of the boiler tube with different fouling thickness and heat transfer coefficient is obtained.The heat transfer coefficient is large and the steam generation increase,the fouling thickness is large,and the amount of steam generated is reduced.In addition,the flue gas temperature of the furnace was increased with the increase of the fouling thickness and the heat transfer coefficient.The temperature of firepot outlet increases as the increase of the fouling thickness.And the tempreture reduces as the increase of the heat transfer coefficient.The simulation analysis of the steam injection boiler under different load is also analysized.The steam boiler with different load increases with the increase of the fouling thickness,and the steam production is reduced and the flue gas temperature of the furnace is increased.The more of steam production,the more sensible the boiler is effected.The heat transfer process of the furnace tube under different fouling thickness and different thermal conductivity can be seen through the analysis of the local heat transfer and heat transfer of the furnace tube.The temperature from the furnace outside the high temperature space inward fluid transmission process is the process of uneven temperature decline,The temperature in the pipe wall is more uniform transmission,encountered scale,the rapid decline in temperature,the greater the thermal conductivity,the more uniform temperature drop.The thickness of the furnace tube is different,the larger the fouling thickness,the less obvious the influence of the heat transfer coefficient changing.