tailieunhanh - ARNOLD, K. (1999). Design of Gas-Handling Systems and Facilities (2nd ed.) Episode 1 Part 5

Tham khảo tài liệu 'arnold, k. (1999). design of gas-handling systems and facilities (2nd ed.) episode 1 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 86 Design of Gas-HANDIJNG Systems and Facilities I t. a I mt inued from page 83 Generally the following design criteria should be provided to the manufacturers or vendors for sizing an exhaust heat recovery unit. 1. Total heat duty required to heat the fluid 2. Properties of the fluid to be heated 3. The outlet temperature of the heated fluid 4. Operational relationships between heat sources and users . which users continue to operate when sources shut down 5. Exhaust gas flow rates at anticipated ambient and at various loads from maximum to minimum 6. Exhaust gas temperature at anticipated ambient and at various loads 7. Maximum exhaust back pressure 8. Ambient temperature range The design of heaters and waste heat recovery units is beyond the scope of this book. Sizing and design are best left to manufacturers. However the concepts discussed in this chapter and in Chapter 2 can be used to verify the manufacturer s proposals. HEAT EXCHANGER EXAMPLE PROBLEM Design a seawater cooler to cool the total stream from the example Held in its later stages of life from a flowing temperature of 175 F to a temperature of 100 F to allow further treating. Given Inlet 100 MMscfd at SG from Table 2-10 6 000 bopd at SG 15 bbl water MMscf T 175 F P 1 000 psig Water vapor in gas 60 Ib MMscf See Chapter 4. Outlet T2 100F p2 990 psig Water vapor in gas 28 Ib MMscf See Chapter 4. Seawater T3 7 5 F Limit temperature rise to 10 F Use 1-in. OD 10 BWG Tubes on 1 -in. Pitch Heat Exctiangers 87 Problem 1. Calculate water flow rate in outlet and water vapor condensed. 2. Calculate heat duty. 3. Determine seawater circulation rate. 4. Pick a type of exchanger and number of tubes required. Solution 1. Calculate free water and water vapor flow rates. Water flow rate in inlet Free water 100 MMscfd 15 bbl MMscfd - 1 500 bwpd Water flow rate in outlet Free water - 1 500 bwpd Water vapor condensed 60 - 28 lb 100 MMscf n i X 3 200 lb d MMscf D X 9 bwpd d 350 lb Water flow rate in .

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