620Documents/com-apple-CloudDocs/Downloads/Process\%20Design\%20Coursework\%2 Practice session 9. Solutions to Apple. Db [Exam Duration] (3) Our Solutions FREE Design Problem 1 Figure 1 shows an existing steam systom servicing a procoss oite. High pressure steam is generated at 40 bar and 350C by heat rocovered trom the heat of roaction of an exothermic reactor being coolod by molen salt. Steam is also generated in a high-pressure steam boiler buming natural gas. also generatiog steam at 40 bar and 350C trom boler feedwater at 105C at a pressure above saturation pressure. Both sources of steam are led into a highpressure oteam main. This high-pressure steam is distributed around the site to service a total heating duty at that pressure of 5MW. Sieam from the high-pressuro main is let down through a back pressure steam turbine to the low-pressure main with an isentropic efficiency of 0.8. The low-pressure steam main operates at 10 bar. Steam is also expanded from the high-pressure main through a condensing turbine to generate 10MW of power with an isentropic efficiency of 0.75. The turbine condenser operates at 0.20 bar, corresponding with a condensate tomperature of 60.1C. The llowrate through the let-down station is kept to be a minimum of 5 th- in order to maintain pressure control. The expansion in the let-down station can be assumed to be isenthalpic. Low-pressure stoam is distributed around the site to service a total heating duty at that pressure of 25MW. Figure 1 Exdating utiliy system. For the ateam system in Figure 1: wethess in the oultet for both isentropic and real outlet conditions [6 Marks] b) Using mass and energy balances around the low pressure stoam heating and the low pressure stoam main, calculate the flowrate of slearn regured to fow throuph the back preseure steam lubbine in kgs1 to sabisty the aite low pressure steam hoaling. Then cabcutate the corrosponding power generation from the slean turbine. Staan heatry from the lowpressure main will use stain direety from the low pressure man for procoss healing [7 Marks] c) Calculate the outlet conditions of the steam at the condensing turbine outlet. Check for wetness in the outlet for both isentropic and real outiet conditions. Comment on whether the conditions are acceptable at the outlet of the turbine. If the steam conditions were not acceptable, what could be done to adjust them without changing the configuration? [12 Marks] d) Calculate the flowrate of steam required to flow through the condensing steam turbine in kgs1 to generate 10MW power. [2 Marks] e) Steam heating for the high-pressure main is to be desuperheated locally by injection of boiler feedwater at 105C to a temperature 5C above saturation. Using mass and energy balances around the steam desuperheating and high-pressure steam heating. calculate the flowrate of boiler feedwater injection in kg1s1 and steam required from the high pressure steam main in kgs1 for the high-pressure steam heating duty. [8 Marks] f) Calculate the flowrate of steam generation for the reactor heat recovery in kg1. [3 Marks] g) Calculate the flowrate of steam required to be generated by the steam boiler in kg1s1. [2 Marks] h) If the low pressure steam heating is to be desuperheated locally by injection of boiler feedwater at 105C to a temperature 5C above saturation, explain qualitatively the changes in the phower generation expected. [5 Marks] 620Documents/com-apple-CloudDocs/Downloads/Process\%20Design\%20Coursework\%2 Practice session 9. Solutions to Apple. Db [Exam Duration] (3) Our Solutions FREE Design Problem 1 Figure 1 shows an existing steam systom servicing a procoss oite. High pressure steam is generated at 40 bar and 350C by heat rocovered trom the heat of roaction of an exothermic reactor being coolod by molen salt. Steam is also generated in a high-pressure steam boiler buming natural gas. also generatiog steam at 40 bar and 350C trom boler feedwater at 105C at a pressure above saturation pressure. Both sources of steam are led into a highpressure oteam main. This high-pressure steam is distributed around the site to service a total heating duty at that pressure of 5MW. Sieam from the high-pressuro main is let down through a back pressure steam turbine to the low-pressure main with an isentropic efficiency of 0.8. The low-pressure steam main operates at 10 bar. Steam is also expanded from the high-pressure main through a condensing turbine to generate 10MW of power with an isentropic efficiency of 0.75. The turbine condenser operates at 0.20 bar, corresponding with a condensate tomperature of 60.1C. The llowrate through the let-down station is kept to be a minimum of 5 th- in order to maintain pressure control. The expansion in the let-down station can be assumed to be isenthalpic. Low-pressure stoam is distributed around the site to service a total heating duty at that pressure of 25MW. Figure 1 Exdating utiliy system. For the ateam system in Figure 1: wethess in the oultet for both isentropic and real outlet conditions [6 Marks] b) Using mass and energy balances around the low pressure stoam heating and the low pressure stoam main, calculate the flowrate of slearn regured to fow throuph the back preseure steam lubbine in kgs1 to sabisty the aite low pressure steam hoaling. Then cabcutate the corrosponding power generation from the slean turbine. Staan heatry from the lowpressure main will use stain direety from the low pressure man for procoss healing [7 Marks] c) Calculate the outlet conditions of the steam at the condensing turbine outlet. Check for wetness in the outlet for both isentropic and real outiet conditions. Comment on whether the conditions are acceptable at the outlet of the turbine. If the steam conditions were not acceptable, what could be done to adjust them without changing the configuration? [12 Marks] d) Calculate the flowrate of steam required to flow through the condensing steam turbine in kgs1 to generate 10MW power. [2 Marks] e) Steam heating for the high-pressure main is to be desuperheated locally by injection of boiler feedwater at 105C to a temperature 5C above saturation. Using mass and energy balances around the steam desuperheating and high-pressure steam heating. calculate the flowrate of boiler feedwater injection in kg1s1 and steam required from the high pressure steam main in kgs1 for the high-pressure steam heating duty. [8 Marks] f) Calculate the flowrate of steam generation for the reactor heat recovery in kg1. [3 Marks] g) Calculate the flowrate of steam required to be generated by the steam boiler in kg1s1. [2 Marks] h) If the low pressure steam heating is to be desuperheated locally by injection of boiler feedwater at 105C to a temperature 5C above saturation, explain qualitatively the changes in the phower generation expected. [5 Marks]