How to calculate the outlet temperature of superheated steam
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The design of the dilution steam generator for pyrolysis furnaces involves process conditions as follows: 1. The dry saturated steam is produced at a pressure of 0.95–1.0 MPa, with a feedwater temperature of 110°C℃； 2. The heating medium is superheated steam, with a pressure of 3.6–4.0 MPa and a temperature of 340°C℃ ； 3. The wastewater volume is 20% of the evaporation volume. 4. Evaporation rate: 25 tons per hour. How to calculate the outlet temperature of superheated steam
Do we still need to calculate the superheated steam outlet temperature? ? In the medium-pressure steam reboilers of the dilution steam systems in ethylene plants, saturated steam is generally used. Even when superheated steam is employed, it still condenses at its saturation pressure within the reboiler. For example, if the steam pressure is 4.0 MPaG and the saturation temperature is 251°C, then the temperature of the condensed liquid will also be 251°C; so what does the concept of a \"superheated steam outlet temperature\" even mean? Are you trying to make use of the sensible heat of superheated steam? Then the area of your reboiler must be really large. . The parameters of your steam generator are a bit strange; the parameters for dry saturated steam are quite high, at 1.0 MPaG and 184°C. How high must be the temperature of the quench oil in your quench oil reboiler? As I recall, the temperature at the bottom of the quench oil tower is around 220°C, while the temperature of the returned oil is between 170 and 180°C. The pressure of the dilution steam generated is generally around 0.6 MPaG; your values seem a bit high. .
What is the approximate overall heat transfer coefficient?....................................
Also, what does medium-pressure steam become in the end: saturated steam, saturated water, or superheated steam? . . I’m going to trouble you. .
I’m sorry; my foundation is a bit weak at the moment, and I’ve caused you trouble. . . .