Analysis And Research On Two-phase Flow Field In Phosphate Engineering Reactor

Phosphoric acid reactor where phosphate rock powder and sulphuric acid reacts with phosphoric acid,is one of the key equipment of its devices production process. Mechanical stirring is used in phosphoric acid reactor, so as to force the feed liquid move along particular direction and flow rate and finally have compound reaction adequately. Mechanical stirrer is also a key equipment of the phosphoric acid process.The purpose of this article is to solve the energy optimisation problem ofφ6500×7500 phosphoric acid reactor in Yunnan Phosphate Fertilizer Plant (selectφ2500PBT impeller which is a four-hinge stirrer) during production. It already have taken several years for the phosphoric acid reactor from design construction to putting into use. The plant hopes to reduce rotate speed, lower the power and lessen electric energy on condition of mixing effect rationally. However, traditional agitator speed design is largely come from engineering experiences,which consider the most important thing is agitator axis power , phosphoric acid characteristics and so on,while they know little about interior flow field and concentratio distribution of solids etc. Hence the design of agitator speed is lack of theoretical foundation. So this paper expects to find out the relationship among interior flow field, concentration distribution of solids and power by software simulating the truths of phosphoric acid reactor, to accomplish the reactor stirs through minimum energy consumption.The energy optimisation problem is theoretically analysed and researched by combining Computation Software Fluent and experimental analysis in this paper. It is simulated and studied the flow field problem of phosphoric acid reactor in the cold water simulated environment, contrasted the findings between the simulated environment and practical environment of phosphoric acid reactor, confirmed that simulated results are reasonable. Meanwhile, the improvement of reactor evolving speed design is proposed in the paper from the comparison results.This research is valuable to the rotational speed design of phosphoric acid reactor.