Dissolved minerals in the boiler feedwater system include metallic salts and calcium carbonates that cause scale, corrosion, and turbine blade deposits. Boiler feedwater is treated with __________ to precipitate these minerals from the water.
a. lime
b. salt
c. lemon
d. ethanol
a. Correct. Boiler feedwater must be treated with lime or soda ash to precipitate these minerals from the water, and recirculated condensate must be deaerated to remove dissolved gases.
b. Incorrect. Boiler feedwater must be treated with lime or soda ash to precipitate these minerals from the water, and recirculated condensate must be deaerated to remove dissolved gases.
c. Incorrect. Boiler feedwater must be treated with lime or soda ash to precipitate these minerals from the water, and recirculated condensate must be deaerated to remove dissolved gases.
d. Incorrect. Boiler feedwater must be treated with lime or soda ash to precipitate these minerals from the water, and recirculated condensate must be deaerated to remove dissolved gases.
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