Water pinch analysis for water and wastewater minimization in Tehran oil refinery considering three contaminants

Kilang penapisan minyak sawit lazimnya melibatkan proses penggunaan tenaga yang tinggi. Peningkatan kecekapan tenaga adalah amat penting bagi memastikan keuntungan tercapai. Kertas kerja ini menggunakan teknik analisis jepit bagi memaksimumkan penggunaan semula haba dan meningkatkan kecekapan sistem rangkaian haba sedia ada di kilang penghasilan minyak sawit, tertakluk kepada kekangan–kekangan proses. Langkah–langkah yang terlibat ialah penetapan sasaran guna semula haba maksimum diikuti dengan reka bentuk rangkaian haba yang ekonomik. Aplikasi teknik berkenaan kepada kilang penghasilan minyak sawit telah menghasilkan pengurangan penggunaan haba panas dan sejuk sebanyak 700 kW (21%), atau penjimatan kos utiliti sebanyak RM370,787, dengan pelaburan kapital sebanyak RM656,293 dan jangka pulangan balik selama 1.77 tahun. Kata kunci: Analisis jepit; minyak kelapa sawit; sedia ada; rangkaian pemindahan haba; kitar semula haba maksimum A palm oil refinery involves energy–intensive processes. Maximizing thermal efficiency of palm oil refinery is crucial for the plant profitability. This work implements a pinch analysis retrofit technique to maximize heat recovery and thermal efficiency of a palm oil refinery, subject to the existing process constraints. The procedures involve setting the maximum heat recovery targets and cost–effective retrofit of the heat exchanger network (HEN). Application of the technique on a palm oil refinery results in reduction of 700 kW (21%) heating and cooling loads or a saving of RM370,787, incurring a capital investment of about RM656,293 and a payback period of 1.77 years. Key words: Pinch analysis; palm oil; retrofit; heat exchanger network; maximum heat recovery

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Water Footprint and Water Pinch Analysis in Ethanol Industrial Production for Water Management

Water ◽

10.3390/w11030518 ◽

2019 ◽

Vol 11 (3) ◽

pp. 518 ◽

Cited By ~ 3

Author(s):

Heng Liu ◽

Lijun Ren ◽

Huimin Zhuo ◽

Sanze Fu

Keyword(s):

Water Management ◽

Environmental Pollution ◽

Water Reuse ◽

Water Footprint ◽

Fuel Ethanol ◽

Pinch Analysis ◽

Energy Demands ◽

Analysis Technique ◽

Ethanol Plant ◽

Water Pinch

Fuel ethanol is considered to be a clean alternative fuel to meet increasing energy demands and mitigate environmental pollution. Faced with challenges in terms of energy security and environmental pollution, China is vigorously developing fuel ethanol. However, ethanol-manufacturing is a water-intensive industry; it consumes large volumes of fresh water and generates a corresponding amount of waste water. Expansion of this industry can reduce water quality and cause water stress. This study aims to combine the water footprint (WF) with a water pinch analysis technique to manage water consumption and sewage discharge systematically in an ethanol plant. A well-operated cassava ethanol plant in China was chosen as a case study. The WF of industrial ethanol production was evaluated. The total WF was 17.08 L/L ethanol, comprised of a 7.69 L blue water footprint (BWF), and a 9.39 L gray water footprint (GWF). The direct WF was 16.38 L/L ethanol, and the indirect WF was 0.70 L/L ethanol. Thereafter, a water pinch analysis was conducted, and the optimal direct water reuse scheme was studied. After the water network was optimized, the BWF was reduced by 0.98 L/L ethanol, while the GWF was reduced by 1.47 L/L ethanol. These results indicate that the combined use of WF and pinch analysis can provide the starch-based ethanol industry with an effective tool to improve its water management.

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6 Introduction to Water Pinch Analysis

Spark ◽

10.1515/spark.99.8 ◽

2019 ◽

Author(s):

Klemeš Jiří Jaromír ◽

Varbanov Petar Sabev ◽

Wan Alwi Sharifah Rafidah ◽

Manan Zainuddin Abdul

Keyword(s):

Pinch Analysis ◽

Water Pinch

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Industrial wastewater minimization using water pinch analysis: a case study on an old textile plant

Water Science & Technology ◽

10.2166/wst.2002.0720 ◽

2002 ◽

Vol 46 (11-12) ◽

pp. 77-84 ◽

Cited By ~ 9

Author(s):

Z. Ujang ◽

C.L. Wong ◽

Z.A. Manan

Keyword(s):

Textile Industry ◽

Industrial Wastewater ◽

Design Method ◽

Operating Cost ◽

Integrated Design ◽

Pinch Analysis ◽

Water Usage ◽

Water Pinch ◽

Wastewater Generation

Industrial wastewater minimization can be conducted using four main strategies: (i) reuse; (ii) regeneration-reuse; (iii) regeneration-recycling; and (iv) process changes. This study is concerned with (i) and (ii) to investigate the most suitable approach to wastewater minimization for an old textile industry plant. A systematic water networks design using water pinch analysis (WPA) was developed to minimize the water usage and wastewater generation for the textile plant. COD was chosen as the main parameter. An integrated design method has been applied, which brings the engineering insight using WPA that can determine the minimum flowrate of the water usage and then minimize the water consumption and wastewater generation as well. The overall result of this study shows that WPA has been effectively applied using both reuse and regeneration-reuse strategies for the old textile industry plant, and reduced the operating cost by 16% and 50% respectively.

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