Simulation And Analysis Of Phosphogypsum And Acid Producing Cement Based On Aspen Plus

Phosphorus chemical industry is a traditional process industry with high energy consumption and high pollution.with its rapid development,the emissions of phosphorus gypsum as a by-product also increase year by year.therefore,how to effectively manage and use phosphogypsum has become a major international challenge.the technology of phosphogypsum acid-producing cement is a typical method of resource recycling,but the equipment and process route of the process are complex,and various technical problems often occur in the actual plant operation.therefore,based on the above difficulties,this paper puts forward the idea of simulating the process of phosphogypsum acid-producing cement,aiming at providing theoretical and data support for actual industrial production through process analysis and simulation calculation,and breaking through the technical bottleneck of the current plant operation test.this paper takes the industrial production process of phosphogypsum raw material with a processing capacity of 1 ton/hour as an example.based on the analysis of the process of phosphogypsum acid co-production cement,the process model of phosphogypsum acid co-production cement system is established based on Aspen Plus chemical simulation software,and the system is simulated and analyzed.the main content is as follows.At first,the simulation foundation of Aspen Plus chemical software is analyzed.the working principle and process model of preheater,predecomposition furnace and rotary kiln are analyzed.Then,the simulation analysis of the system technological process is carried out.based on the software of Aspen Plus,the theoretical hypothesis and modeling analysis of the four-stage cyclone preheating,predecomposition and rotary kiln firing process of raw materials are made,and the reliability of the simulation results of three parts is verified.according to the analysis of Aspen Plus'sensitivity tool,the raw material decomposition rate in the pre-decomposition furnace is the highest when the three-time air flow is 4300kg/h and the fuel coal flow is 130kg/h.Finally,the process of the whole system is analyzed and optimized with Aspen Plus software.the sensitivity tool analysis module was established for the important parameter variables of the process.the results showed that when the proportion of coal distribution was 2.7,the proportion of secondary and tertiary air distribution was 1.75,and the proportion of sulphur and coal was 0.3,the concentration of SO₂ in the system outlet waste gas reached the highest.the optimal operation parameters above were input into the whole process system,and the result was obtained through the simulation calculation of Aspen Plus.at this time,the concentration of SO₂ reached 11.87%,which fully met the requirement of acid production.