【Daily Question】20150718 Knowledge of water treatment in furnaces (2 wealth points for replies + additional 3 wealth points for correct answers)
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To increase popularity in the boiler area and meet the demands of the region, the 【One Question per Day】 activity is launched to foster technical exchanges, liven up the atmosphere, and offer rewards; all colleagues are welcome to participate actively. Calcium ions in the boiler water react with phosphate ions to form basic calcium phosphate, which is a soft type of slag that can be easily removed through the boiler’s blowdown process; it does not adhere to the inside of the boiler and turn into scale. ( ) Reply in the comments with the answer you think is correct (for true/false questions, an additional 3 points will be given for a correct response). 1. Participating in answering questions + 2 wealth points (set to automatically add wealth) ； 2. No additional points will be given for incorrect answers; comments will provide the correct answer for reference ； 3. +3 points to wealth if the answer given is correct ； 4. When responding, provide a detailed explanation and analysis of the question or answer; depending on the quality of the response, an additional reward of 3 to 15 points in wealth will be given ； 5. Replies with correct answers and accurate explanations will be designated as the best reply (best assistance). Note: We will close this post after 72 hours to reveal the answers and explanations, as well as the best response (the best help).
Correct answer: Calcium ions in the boiler water react with phosphate ions to form basic calcium phosphate, which is a soft type of sludge that can be easily removed through the boiler’s blowdown process; it does not stick to the inside of the boiler and turn into scale. ( √ )
The principle behind phosphate treatment in the water of drum boilers is to maintain a certain level of phosphate ions (PO43-) in the boiler water by adding phosphate solutions. Since the boiler water is under boiling conditions and has a high alkalinity (with a pH value typically ranging from 9 to 11), calcium ions in the water react with phosphate ions as follows: 10Ca2+ + 6PO43- + 2OH- → Ca10(OH)2(PO4)6 (calcium hydroxide phosphate). The calcium hydroxide phosphate that is formed is a soft type of sludge that can be easily removed through the boiler’s blowdown process, and it does not adhere to the inside of the boiler to form scale
Calcium ions in the boiler water react with phosphate ions to form basic calcium phosphate, which is a soft type of slag that can be easily removed through the boiler’s blowdown process; it does not adhere to the inside of the boiler and turn into scale. ( ) Answer: Incorrect.
Calcium ions in the boiler water react with phosphate ions to form basic calcium phosphate, which is a soft type of slag that can be easily removed through the boiler’s blowdown process; it does not adhere to the inside of the boiler and turn into scale. (Yes)
Answer: Correct. Principle: By adding a phosphate solution to the boiler water, a certain amount of PO43‑ is maintained. Under conditions of boiling and high alkalinity (pH value = 9–11), calcium ions in the boiler water react with phosphate ions as follows: 10Ca2+ + 6PO43- + 2OH- = Ca10(OH)2(PO4)6. The resulting basic calcium phosphate is a soft type of sludge that can be easily removed through the boiler’s blowdown process, thereby keeping the concentration of Ca2+ in the boiler water very low.
Calcium ions in the boiler water react with phosphate ions to form basic calcium phosphate, which is a soft type of slag that can be easily removed through the boiler’s blowdown process; it does not adhere to the inside of the boiler and turn into scale. (Correct)
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