Heat Exchanger Network Thermal Analysis Using Hybrid Pinch Technology
Ongoebi Maureen Orubide Etebu,
Joy Ejayeta Abraham-Igwemoh
Issue:
Volume 5, Issue 2, June 2020
Pages:
14-22
Received:
24 April 2020
Accepted:
25 May 2020
Published:
28 June 2020
Abstract: This research employs hybrid pinch analysis method to evaluate the heat exchanger network (HEN) of an existing refining plant for thermal design bottlenecks. The pinch rules and thermodynamic models were used to analyze the existing network design using available heat flow data to and from each cascade to determine the pinch temperature on incremental heat changes. The pinch point was discovered at the 6th and 7th temperature interval corresponding to a process pinch of 188°C with temperature above and below pinch at 193°C and 183°C respectively. The temperature profile showed two distinct regimes: exponential and linear trend lines within 0°C and 110°C which indicated an initial uneven temperature rise that later stabilized with increment proportional to the heat flow quantity within the heat exchanger with time. Furthermore, the temperature of the crude after it passed through the preheat exchanger network in the base case was found to be 242°C but through the retrofit method 275°C was achieved resulting in 33°C temperature differential. By this approach, the base case number of heat exchangers and trains were reduced from 36 and 20 to 30 and 10 respectively and an energy saving of about 19255KJ was achieved for each second the plan was operated.
Abstract: This research employs hybrid pinch analysis method to evaluate the heat exchanger network (HEN) of an existing refining plant for thermal design bottlenecks. The pinch rules and thermodynamic models were used to analyze the existing network design using available heat flow data to and from each cascade to determine the pinch temperature on incremen...
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Inventory Control of Tellus 68 Oil and Tellus 46 By Using Economic Order Quantity Method (Case Study at Pama Persada Nusantara, Kpcs Sangatta District, East Borneo)
Irnanda Pratiwi,
Winny Andalia,
Hazairin Samaullah
Issue:
Volume 5, Issue 2, June 2020
Pages:
23-27
Received:
6 June 2020
Accepted:
19 June 2020
Published:
6 July 2020
Abstract: Inventory is a companies asset that has an important role in business operations, so companies need to proactive management, which means companies should be able to anticipate the circumstances and challenges that exist in inventory management to achieve the ultimate goal, namely to minimize the total costs to be incurred by the company for handling inventory. Research conducted at Pama Persada Nusantara District KPCS aims to find out the amount of economical supply procurement in the effort to meet the procurement of Tellus 68 and Tellus 46 oil supplies to support the company's operational activities continuously. The analysis method used is EOQ (Economic Order Quantity), the total cost of inventory obtained from EOQ for Tellus 68 oil is Rp. 3.435.607.950 and Tellus Oli 46 is Rp. 8.424.243.631. The cost of the company for Tellus 68 Oil is Rp. 3.542.953.830 and Tellus 46 Oil is Rp. 9.065.390.370 so that the cost efficiency comparison between company policy and EOQ is Rp. 748.492.619. The results of this study showed that the most economical inventory by comparing the amount of ordering time, the number of purchases, the cost of ordering, storage costs, and the minimum total inventory cost of the company.
Abstract: Inventory is a companies asset that has an important role in business operations, so companies need to proactive management, which means companies should be able to anticipate the circumstances and challenges that exist in inventory management to achieve the ultimate goal, namely to minimize the total costs to be incurred by the company for handlin...
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