Research On Energy Consumption Analysis And Energy Saving Optimization Of Natural Gas Purification System

With the increasing global environmental problems,energy conservation and consumption reduction have become an inevitable topic in human society.Natural gas is one of the most important conventional energy sources today,and natural gas purification is a high-energy-consuming industry.At present,the research depth of domestic energy-saving technologies is quite different from that of foreign studies.The development of natural gas purification and energy conservation work is of great significance.This paper takes the purification device and auxiliary device of a natural gas purification plant in Ordos 400×104m3·d-1,as the research object,and analyzes the energy consumption based on the survey data.Based on this,the Aspen HYSYS simulation software is used to construct a process simulation for the device including the purification device,the methanol recovery device and the sulfur recovery device.Based on the verified process models of each device,energy-saving optimization was carried out from multiple aspects and multiple sets of devices.Firstly,the heat transfer network was optimized according to the pinch technology using Aspen Energy Analyzer software,and secondly from the operating parameters or Optimization of equipment transformation.HTRI software design and selection for the heat exchanger involved in the replacement,statistical optimization effect,and comparison with the field application effect of the energy saving scheme.Finally,the software development was carried out according to the research process using Visual Basic6.0 programming tool.Specific research results include:(1)Through the large amount of data collection and finishing work carried out in the early stage,the actual energy consumption data before the purification plant transformation is obtained,wherein the energy consumption of the purification device is 66.7634kgce/104m3,and the energy consumption of the methanol recovery device is 10.9914kgce/104m3,and the sulfur recovery device The total production capacity is 9.1137kgce/104m3.(2)Process simulation study was carried out on each device,using Aspen HYSYS to establish the basic simulation model of the device,verifying the feasibility of the model through simulation data and actual device operating parameters.(3)The energy-saving optimization result of the purification device,the heat exchange network is reasonable,and then the operation parameters are optimized.The results show that under the condition that the other parameters are unchanged:the circulation of MDEA solution is reduced from 180m3·h-1 to 150m3·h-1 The unit energy consumption can be saved by 2.3452kgce/104m3;after the TEG circulation is from 6.05 m3/h to 5.5 m3/h,the unit energy consumption is 0.5960kgce/104m3;the temperature of the TEG circulating fluid is lowered from 50 ? to 54 ?,the energy saving per unit is 1.3596 kgce/104m3.(4)The energy-saving optimization result of the methanol recovery unit,the heat exchange network is reasonable,and then the energy-saving scheme of the pump-frequency conversion and power-saving is proposed.The estimated construction investment of the plan is 60,600 yuan,and the static recovery period is expected to be 0.18 years,which can save The unit energy consumption is 1.6692kgce/104m3.(5)The heat recovery network of the sulfur recovery unit is reasonable,and then the heat exchange network between the sulfur recovery and purification unit,the sulfur recovery and the methanol recovery unit is optimized,and two optimization schemes are determined.One is sulfur recovery medium pressure steam and The TEG rich liquid heat exchange in the dewatering section,the second is the heat exchange between the sulfur recovery low pressure steam and the methanol recovery tower bottom water;the design and selection of the preheater by HTRI software,the calculation of the two optimization scheme construction investment is 1,796,300 yuan,and the optimization income It is 2,572,500 yuan per year,and the estimated payback period is 0.71 years,which can save 16.0914kgce/104m3.(6)On-site application effect of energy-saving optimization scheme shows that the total energy consumption of the purification plant after renovation is 50.4794kgce/104m3,which is 18.2073kgce/104m3 lower than the total energy consumption of the unit before the transformation of 68.6667kgce/104m3.(7)Using Visual Basic 6.0 software programming tool,combined with the methods involved in the research,developed the petrochemical plant benchmarking energy-saving optimization software,with energy consumption analysis,pinch analysis and parameter optimization features,which can be used for reference by other enterprises.