Simulation Optimization and Revamping of QILU SM Unit for the Energy-saving Purpose
|Keywords||Styrene Energy-saving Reflux ratio Simulation and Optimization|
Styrene is an important organic raw materials for the production of plastics and synthetic rubber, it is after the polyethylene (PE), polyvinyl chloride (PVC), ethylene oxide (EO), the fourth largest ethylene derivatives. Due to the huge gaps and continued strong growth in domestic demand, China's styrene production capacity growth. China Petrochemical Qilu Plastic Factory styrene plant renovation and expansion is completed, the high energy consumption. In order to further reduce energy consumption, energy recovery, to improve existing processes and Optimal Synthesis has important practical significance. This article uses the chemical process simulation software PRO / II existing styrene production process simulation, a number of simulation optimization and energy saving devices. This paper discusses the major the styrene production line, combined with the expansion of Qilu 200,000 tons / year styrene plant, and introduced the styrene plant simulation and optimization and energy-saving. According to the process, the appropriate selection of the operating unit module and the thermodynamic method, create a process model for steady-state simulation. Using PRO / II process simulation software process simulation and sensitivity analysis, process parameters were optimized to obtain the optimum operating conditions; simulation based on styrene heat exchanger network optimization, eliminating the steam vent waste; ethylbenzene / water steam superheater rehabilitation programs, eliminating the bottleneck affecting plant operation; T-203 tower and T-402 tower latent heat of condensation is not fully utilized problem, an improved heat exchanger network, increase the heat exchanger preheating benzene and dehydrogenation solution revamping scheme, after the transformation of production, reduce the steam consumption of the device 2.6t / h, the recovery of the latent heat of condensation of the device; analysis device process stream and equipment structure, increase the F-301 boiler water preheating section and increase air preheater energy-saving program, after the transformation of the actual operating results show that the decrease in the amount of fuel gas 50kg/hr to increase steam production 0.4t / h, the energy saving effect is remarkable; through simulation analysis for the problem of insufficient capacity of the E-301 heat exchanger, E-301 exist, and rehabilitation programs, production of more than six months that the heat transfer capacity of the heat exchanger significantly improved, the transformation was a complete success. Optimization and transformation, an increase of economic benefits of 14 million yuan. The set of styrene plant simulation and optimization and energy saving experience of similar devices process optimization.