EG-208 Process Design And Simulation Supplementary Q&A Sample

Component 1: Pinch Analysis Process Design And Simulation Supplementary

Question 1: Both the “Composite” and “Shifted Composite” curves for the hot and cold streams

Figure 1: Composite and shifted composite diagram

(Source: Self-created in Excel)

Question 2: The “Problem Table” and “Heat Cascade” for this process

Using the information in Table 1, based on the fact that you are using a ΔTmin of 20oC, perform a pinch analysis to present the following:

From the problem table, the graph is produced. It makes the inclination towards (Riadi et al. 2021). It has an upward direction. It meets some specific values that are needed to complete the graph.

Table 1: Problem table

(Source: Self-created in Excel)

Question 3: The “Grand Composite” curve for this process.

Figure 2: Grand Composite

(Source: Self-created in Excel)

This diagram shows the series 1 and series 2 the

In the framework of a heat exchanger, the grand composite refers to a thorough depiction of the system's performance for its whole operational range, which ranges from 0 to 100% capacity (Schlosser et al. 2019). To get a comprehensive understanding of the behaviour of a heat exchanger under various operating situations, it is necessary to analyze some characteristics, particularly the transfer of heat rates, temperature profiles, and the flow of fluid rates. Using this thorough study, it is possible to pinpoint the best heat exchange sites as well as pinch points and potential inefficiencies (Wahab et al. 2022). The grand composite provides a thorough knowledge of a heat exchanger's thermal properties by combining data from multiple scenarios, allowing scientists and engineers to make educated judgments and raise the heat exchanger's overall effectiveness.

Question 4: The minimum hot & cold utilities required for this process.

Figure 3: The minimum hot & cold utilities

(Source: Self-created in Excel)

Hot streams:

T_int= T_act-(T_min/2)

Cold streams:

T_int= T_act+(T_min/2)

The minimal hot and cold utilities needed for a given operation are determined using pinch analysis. By examining the heat transfer between the hot and cold streams, it seeks to minimize energy usage.

• Pinch Point Identification: After determining the minimal temperature differential (T min) across the hot and cold streams, the next step is to locate the "pinch point." The T min value in this situation is 20°C.
• Heat Exchanger Network construct: To enable the movement of heat from hot streams to cold streams, engineers construct a heat exchanger network (Li et al. 2019). The network seeks to maximize heat recovery while minimizing the temperature differential between these streams.
• Heat Integration: At the pinch point, the heated flows cool to the same temperature as the cold streams. Through this integration, the surplus heat through the hot streams may effectively warm up the cold streams.
• Optimal Heat Exchanger Configuration: The goal is to set up the heat exchanger network such that the temperatures of the hot and cold streams are as near to one another as possible. As a result, fewer extra exterior hot- or cold-water utilities are required.
• Reduced Energy Consumption: The process uses less energy since it is closer to the pinch point, which lowers operating costs and improves energy efficiency.
• Environmental Benefits: Lessening the consumption of external utilities also improves the sustainability of the environment. It lessens the process's overall emissions of greenhouse gases and negative environmental effects.
• Industrial Applications: Pinch Analysis is frequently used to optimize energy utilization and improve overall process performance in a variety of sectors, including petroleum products, refineries, and chemical processing.
• Process Integration: Using pinch analysis to combine hot and cold streams guarantees effective energy use and encourages energy-saving techniques.

In order to determine the minimal both hot and cold utility needed for a process, pinch analysis is extremely important. Engineers can improve the process's energy effectiveness, lower expenses, and environmental advantages by getting near to the pinch point and maximising heat exchange.

Question 5: The pinch temperature for this process

Figure 4: The pinch temperature

(Source: Self-created in Excel)

In the heat exchange systems design, the pinch temperature denotes the crucial location where the cold and hot composite curves connect or are most converging (Nyong-Bassey et al. 2020). It indicates the minimal temperature 0 to 500 it is differential (Tmin) that is necessary for effective heat exchange at the separation among both the cold and hot process streams.

Engineers determine the pinch temperature throughout the pinch analysis to maximize the performance of the heat exchanger (Andiappan et al. 2019). Heat exchange takes place at the heat recovery zone below a pinch temperature, where the stream that is hot heats the cold stream. The heat removal zone, on the other hand, is where the heat exchange takes place below the pinch temperature when the cold stream drains heat out of the hot stream.

Engineers can establish the minimal approach temperature required for efficient heat transmission by analyzing the pinch temperature.

When designing, modifying, or retrofitting heat exchangers, engineers use the pinch temperature as a critical design parameter to ensure the most effective heat transfer and process optimization (Jain et al. 2022). Engineers may minimize energy usage, save operating costs, and improve the continued existence of industrial processes by focusing on the pinch point.

Question 6: Heat exchange network diagram

In H1 the initial temperature is 265 and the final temperature is 70. After pinch it becomes to initial temperature is 70 and the final temperature is 60. In H2, the initial temperature is 520 and the final temperature is 215. After pinch it becomes the initial temperature is 215 and the final temperature is 30. In C1, the initial temperature is 280 and the final temperature is 80. After pinch it becomes the initial temperature is 80 and the final temperature is 70. In C2, the initial temperature is 450 and the final temperature is 150. After pinch it becomes the initial temperature is 150 and the final temperature is 100.

Reference list

Journal

• Schlosser, F., Arpagaus, C. and Walmsley, T., 2019. Heat pump integration by Pinch analysis for industrial applications: a review. Chem. Eng. Trans, 76.
• Andiappan, V., Foo, D.C. and Tan, R.R., 2019. Process-to-Policy (P2Pol): using carbon emission pinch analysis (CEPA) tools for policy-making in the energy sector. Clean Technologies and Environmental Policy, 21, pp.1383-1388.
• Li, B.H., Castillo, Y.E.C. and Chang, C.T., 2019. An improved design method for retrofitting industrial heat exchanger networks based on Pinch Analysis. Chemical Engineering Research and Design, 148, pp.260-270.
• Nyong-Bassey, B.E., Giaouris, D., Patsios, C., Papadopoulou, S., Papadopoulos, A.I., Walker, S., Voutetakis, S., Seferlis, P. and Gadoue, S., 2020. Reinforcement learning based adaptive power pinch analysis for energy management of stand-alone hybrid energy storage systems considering uncertainty. Energy, 193, p.116622.
• Abdul-Latif, N.I.S., Ong, M.Y., Nomanbhay, S., Salman, B. and Show, P.L., 2020. Estimation of carbon dioxide (CO2) reduction by utilization of algal biomass bioplastic in Malaysia using carbon emission pinch analysis (CEPA). Bioengineered, 11(1), pp.154-164.
• Liu, H., Ren, L., Zhuo, H. and Fu, S., 2019. Water footprint and water pinch analysis in ethanol industrial production for water management. Water, 11(3), p.518.
• Van Fan, Y., Klemeš, J.J. and Chin, H.H., 2019. Extended waste management pinch analysis (E-WAMPA) minimising emission of waste management: EU 28. CHEMICAL ENGINEERING, 74.
• Salman, B., Nomanbhay, S. and Foo, D.C., 2019. Carbon emissions pinch analysis (CEPA) for energy sector planning in Nigeria. Clean Technologies and Environmental Policy, 21, pp.93-108.
• Varbanov, P.S., Chin, H.H., Klemeš, J.J. and Cucek, L., 2022. Sustainability of a Plastic Recycling/Symbiosis Network via Energy Quality Pinch Analysis. Chemical Engineering Transactions, 94, pp.97-102.
• Kong, K.G.H., Multi-Period Modelling for Multi-Entities Energy Planning in Malaysia using Pinch Analysis.
• Riadi, I., Putra, Z.A. and Cahyono, H., 2021. Thermal integration analysis and improved configuration for multiple effect evaporator system based on pinch analysis. Reaktor, 21(2), pp.74-93.
• Xinglong, S.M.Z.F.L. and Lanyi, S., 2021. Heat Exchanger Network Retrofit of Diesel Hydrotreating Unit Using Pinch Analysis. China Petroleum Processing & Petrochemical Technology, 23(2), p.34.
• Jain, S., Bandyopadhyay, S., Varbanov, P.S. and Klemeš, J.J., 2022. Pinch Analysis Approach for Segregated Targeting Networks with Forbidden Matches. Chemical Engineering Transactions, 94, pp.103-108.
• Wahab, A.S.A., Liew, P.Y., Rozali, N.E.M., Alwi, S.R.W. and Klemeš, J.J., 2022. Spatial Total Site Heat Integration Targeting using Cascade Pinch Analysis. Chemical Engineering Transactions, 94, pp.643-648.