What is the typical concentration of phosphate added to boilers to improve water quality?
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What is the typical concentration of phosphate added to boilers to improve water quality?
A phosphate solution is added to the boiler water, with the concentration of phosphate ions (PO43-) being controlled. Under alkaline conditions, the following reaction occurs: 10Ca2++6 PO43-+2OH→Ca10(OH)2(PO4)6. The compound resulting from this reaction, Ca10(OH)2(PO4)6, is known as basic calcium phosphate; it is a soft type of slag that can be easily removed through the boiler’s waste discharge process. In actual production, trisodium phosphate or sodium acid phosphate is typically used to prepare a solution with a mass fraction of 5%–8%; after filtration to remove residues, this solution is diluted to 3% using make-up water, and then added directly to the furnace water or to the feed water. The amount of addition is related to the Ca2+ content in the feed water. In actual use, it still needs to be determined through debugging.
Very detailed, thank you:victory: :loveliness: