Heat Recovery And Utilization Of Condensed Water Of A Refinery

Petro-chemical industry can generate a large number of condensated water during production process.However,the heat of condensate water and the water resource cannot be used reasonably which can cause the vast waste of the heat resource and the water resource.A refinery in Shandong Province has four factory sites which include the first,the second,the third site of east petrochemical industry and the site of west petrochemical industry.The output of condensate water adds up to 312.32t/h from those four factory sites.The unreasonable using of condensate water causes the large waste at present.Based on this company condensate system,using relevant original design data,process operating procedures,calibration reports and DCS-related operational data,the analysis found that the heat exchange system of C-101,E401,E408 and E103 in the first site of east petrochemical industry’s dehydrogenized equipment can be transformed.By drawing the original system process inside equipment and using Aspen Plus software to stimulate the heat exchange process of C-101,E401,E408 and E103,this article found that the steam of 0.35 MPa,from the original heat source of E401,E408 and E103,can be replaced by the condensate water of 120 ℃generated by the equipment.The result indicated that the formal heat exchange area can satisfy the process requirement of condensate water’s heating.This kind of technical transformation not only recovered the heat of condensate water but also decreased condensate water’s temperature which can enter the precision processing equipments of degreasing and deironing directly by leaving out the heat exchange of water recycle.It can save 32004 t steam each year.This transformation can recover high quality water and recovered condensate water can be directly fed to boiler without pollution which can decrease the usage of demineralized water,save the cost of wastewater treatment,recover condensate water and decrease the output of condensate water.The transformation can save 12.04 million Yuan each year.After the transformation of condensate water’s heat exchange system,Hazop analysis method is used to analyze the risk factors existing in heat exchange process,and relevant measures are taken to ensure the essential safety of heat exchanger network.