Application Of Heat Exchanger Network And Steam Power Optimization Technique For Ethylene Plant

The energy resoucres supply is hard up in our country. The consumption of the energyutilization for single product is greater than that in the developed countries, which is thebaffle for the development consumption of the national economy. So saving and cuttingdown the consumption of energy is the clever behavior. Chinese industrial energyconsumption is more than70%of the national total energy consumption.Energyconsumption of petroleum chemical industry is15.2%of the national total energyconsumption,22.6%of the energy consumption of the Chinese industry. In the petroleumchemical industry,ethylene device not only is "bibcock" device, but also energy-hungry,therefore the energy saving in the ethylene plant of the national total energy consumptiondecline has important significance.Faced to the strict power consumption requirements in the national12th Five-YearDevelopment Plan, China Petrochemical Corporation carried out technology projects ofcost reduction and efficiency energy conservation. Optimal technology applicationproject of heat exchanger network and steam power system in ethylene plant ofGuangzhou Branch is one of the important energy saving projects.In this paper, aimed to high energy consumption in ethylene plant of the SinopecGuangzhou, process design parameters and actual production parameters were collectedand process modeling was simulated and optimized by software, to identify the cause ofthe high energy use. Based on the results of software simulation, optimal operation isproposed to reduce the energy consumption and maximize economic benefits.The paper has worked in the following aspects:(1) Researching for of steam power system, refrigeration system and separation system ofthe ethylene plant; collecting the designing parameters and the manufacturing parameter.Constructing the process model and simulating it with AspenPlus software, in order toobtain thermodynamic information of all process streams and the process parameterswhich can not be measured accurately.(2) Under the prerequisite of process simulation results being the same with actualproduction operation, each system was optimized by DIST-int software;(3) Focused on the equipment and flow of the low temperature zone in separation system, the theoretical minimum amount of public works and the actual usage was comparativelyanalyzed combined simulation results of the Dist-int, Cryo-int, Heat-int and AspenPlussoftware;（4）After the analysis of energy use to identify the high energy consumption, theoptimal operation of device energy system and energy saving program was proposed.