Air ejectors and DC heaters 2023//2024

Air ejectors and DC heaters 2023//2024 With the steam control valve wide open during normal operation, the rate of steam flow from the auxiliary exhaust steam line to the DC heater is actually a function of __________. a. rate of condensation in the DC heater b. spring pressure of the spray valves c. water level in the DC heater reservoir d. rate of evaporation in the DC heater - ANSWER A In order to test the lifting pressure of the deaerating feed heater relief valve, you would __________. I. close the auxiliary exhaust dump valve to the main and auxiliary condensers II. increase the set point of the make-up steam regulator to the auxiliary exhaust system a. I only b. II only c. Both I and II d. Neither I nor II - ANSWER C The DC Heater functions to __________. a. store, heat, and deaerate feed water b. chemically treat feed water to remove carbonic gas c. ensure recirculation in the feed water system d. remove the major amount of non-condensable gases from the main condenser - ANSWER A If the DC heater relief valve lifts frequently, the cause can be excessive __________. a. condensate supplied to the DC heater b. auxiliary exhaust steam pressure c. feed water recirculated from the feed pump d. makeup feed introduced to the system - ANSWER B If the boiler water and condenser hot well levels are normal, but the DC heater level is only 30% of full, you should __________. a. increase the speed of the condensate pump b. open the feed pump recirculating valve wide c. open the makeup feed d. bypass the vent condenser and third-stage feed heater - ANSWER C Condensate is pumped from the condenser to the DC heater instead of directly to the boiler because __________. a. boiler feed pumps must operate with a negative suction head b. suspended solids in the condensate must be eliminated c. condensate should be deaerated before entering the boiler d. condensate at condensing temperature is too hot and will cause thermal stress in the boiler - ANSWER C If the boiler water level is normal, the main condenser hot well level is normal, and the DC heater level is 40% full, you should __________. a. prime the condensate pump b. bypass the vent condenser c. slow the main