46 Questions on 10 Years of Professional Knowledge

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46. Three users in a continuous polymerization process require heating using heat transfer oil at three different temperatures: 240°C, 260°C, and 280°C. Which of the following methods can meet this requirement? A. Use a heat transfer oil furnace with an outlet temperature of 280°C, and install separate circulation pumps at each user site. B. Use a heat transfer oil furnace with an outlet temperature of 240°C, and heat the sites at 260°C and 280°C using 1.3 Mpa saturated steam. C. Use three heat transfer oil furnaces with outlet temperatures of 240°C, 260°C, and 280°C respectively to supply heat to three different users. D. Use a heat transfer oil furnace with an outlet temperature of 280°C; cool the site at 240°C using circulating water, and heat it at 280°C using 1.3 Mpa saturated steam. What I want to ask is: in option A, since the temperature of the heat transfer oil is 280°C, shouldn’t the circulation pumps at each user site also be set to 280°C? Isn’t it required that the temperatures be 240°C and 260°C?