Steam Injection Boiler Working Condition Analysis And Research On Improving Thermal Efficiency

Using high temperature and high pressure steam which steam injection boiler produce to recover heavy oil is the main way of heavy oil recovery now.Steam injection boiler is the main energy comsumption equitpment in oil field.Considering the convenience and selectivity of steam injection boiler for fuel,we use crude oil that oil field produce itself as fule.In order to save crude oil which is produced by oil field itself, these years oilfield begin to use heavy oil to replace crude oil.After modified,several problems successively appear such as flame turns yellow,smoke becomes black,dust increases,soot cleaning cycle shortens,steam temperature decreases and thermal efficiency of boiler becomes low. To solve these problems.We simplify the complex heat transfer working conditions into three links to analyse such as energy conversion transmission,energy utilization and energy recovery. we use four kinds of advanced technologies to solve each problem of these links.They are watered fuel emulsification, oxygen-enriched combustion,soot blowing of convection section and waste heat recovery. We write a MATLAB program for working conditions of burning crude oil and heavy oil in boiler to simulate and analyse.We do simulation analysis of conditions when four kinds of advanced technologies are used.We also do simulation analysis of conditions when the first two,the first three and all of four advanced technologies are composited.In order to present combustion conditions in combustion chamber of steam injection boiler better, on the basis of MATLAB simulation,we do FLUENT simulation on radiation section of steam injection boiler.After simulation we get the best water blending ratio,the best oxygen-enriched concentration and the best smoke exhaust temperature. We get operation chart of integration transforming in boiler after simulating of integration condition.These provide guidance for site operation of boiler.