【Daily Question】Chemical Engineering Principles 532: Furnace Water Phosphate Treatment (March 19)
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The Chemical Engineering Theory section is launching the \"One Question per Day\" campaign starting today, aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering,\" \"Mass Transfer and Separation,\" \"Thermodynamics in Chemical Engineering,\" and \"Chemical Process Engineering.\" We hope for your active support~~~ Answers to the \"One Question per Day\" questions can be viewed directly here; the topic will be closed after 1 day! ! To encourage continued participation from everyone this year! Participation earns 3 wealth points, with an additional 4 wealth points for correct answers~~~ Short answer question: What issues should be considered when performing phosphate treatment in molten steel? Answer: Phosphate treatment has anti-scaling benefits, but it also increases the salt content in the boiler water, which in turn affects the quality of steam and can even promote metal corrosion. Therefore, when using phosphate treatment, the following points must be taken into consideration: 1) The hardness of the feed water should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content, and this can severely affect the quality of steam. 2) The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the operation of the boiler. 3) The dosing rate should not be too fast, and it must be uniform to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4) Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heated surfaces or block the pipes. 5) Boilers that are already scaled need to have their scale removed first before phosphate treatment can be carried out. 6) Quality inspection should be carried out before drugs are stored to ensure that they meet quality standards; otherwise, the misuse of substandard products can lead to catastrophic accidents. The industrial trisodium phosphate currently in use must meet the following requirements: its purity should be greater than 92%, and the amount of insoluble impurities should be less than 0.5%.
1) The feed water hardness should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content in it, and in severe cases this can affect the quality of the steam. 2) The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the operation of the boiler. 3) The dosing rate should not be too fast, and it must be uniform to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4) Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heated surfaces or block the pipes. 5) Boilers that are already scaled need to have their scale removed first before phosphate treatment can be carried out. 6) Quality inspection should be carried out before drugs are stored to ensure that they meet quality standards; otherwise, the misuse of substandard products can lead to catastrophic accidents. The industrial trisodium phosphate currently in use must meet the following requirements: its purity should be greater than 92%, and the amount of insoluble impurities should be less than 0.5%.
1. The hardness of the feed water should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content in it, and in severe cases this can affect the quality of the steam； 2. The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the proper operation of the boiler ； 3. The dosing rate must not be too fast, and it needs to be uniform, in order to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam ； 4. Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heating surfaces or block the pipes ； 5. Boilers that are already scaled must have the scale removed first before phosphate treatment can be carried out ； 6. Quality inspections should be conducted on drugs before they are stored, to ensure that they meet quality standards; otherwise, the use of substandard products could lead to disastrous consequences.
1) The feed water hardness should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content in it, and in severe cases this can affect the quality of the steam. 2) The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the operation of the boiler. 3) The dosing rate should not be too fast, and it must be uniform to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4) Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heated surfaces or block the pipes. 5) Boilers that are already scaled need to have their scale removed first before phosphate treatment can be carried out. 6) Quality inspection should be carried out before drugs are stored to ensure that they meet quality standards; otherwise, the misuse of substandard products can lead to catastrophic accidents. The industrial trisodium phosphate currently in use must meet the following requirements: its purity should be greater than 92%, and the amount of insoluble impurities should be less than 0.5%.
(l) The water hardness should meet the quality standards (the hardness of water supplied to low-pressure boilers should not exceed 35 μmol/L)； The hardness of the feed water for medium-pressure boilers shall not exceed 5 μmol/L ； The hardness of the feed water for high-pressure boilers should not exceed 3 μmol/L, to prevent excessive hardness from causing the formation of large amounts of sludge in the boiler water, thereby affecting the quality of the steam. (2) To maintain a stable level of excess phosphate in the boiler water, chemical dosing should be carried out continuously. (3) Carry out continuous boiler blowdown and periodic drum blowdown correctly and in a timely manner to reduce the salt content in the boiler water and remove the resulting sludge. (4) For boilers that are already fouled, the scale must be removed completely before applying phosphate treatment, in order to prevent the scale from reacting with excess phosphate ions and causing large amounts of scale to fall off. This can result in turbid boiler water in mild cases, and pipe blockages in severe cases. (5) The industrial trisodium phosphate used shall meet the following standards: the purity of Na3PO4·12H2O shall be not less than 92% ； The insoluble residue is not more than 0.5%.
Phosphate treatment has anti-scaling benefits, but it also increases the salt content in the boiler water, which in turn affects the quality of steam and can even promote metal corrosion. When using phosphate treatment, the following points must be taken into account: 1) The hardness of the feedwater should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content there, and in severe cases this can affect the quality of steam. 2) The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the proper operation of the boiler. 3) The dosing rate should not be too fast, and it must be uniform to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4) Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heated surfaces or block the pipes. 5) Boilers that are already scaled need to have their scale removed first before phosphate treatment can be carried out. 6) Quality inspection should be carried out before drugs are stored to ensure that they meet quality standards; otherwise, the misuse of substandard products can lead to catastrophic accidents. The industrial trisodium phosphate currently in use should meet the following requirements: its purity must be greater than 92%, with insoluble impurities at less than 0.5%.
1. The water hardness should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content in it, and in severe cases this can affect the quality of the steam. 2. The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the proper operation of the boiler. 3. The dosing rate must not be too fast, and it needs to be uniform, in order to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4. Waste discharge must be carried out properly in order to remove the slag that is formed; otherwise, this slag will adhere to the heated surfaces or block the pipes. 5. Boilers that are already scaled must have the scale removed first before phosphate treatment can be carried out. 6. Quality inspection should be conducted on drugs before they are stored, to ensure that they meet quality standards; otherwise, the use of substandard products could lead to disastrous consequences. The industrial trisodium phosphate currently in use must meet the following requirements: its purity should be greater than 92%, and the amount of insoluble impurities should be less than 0.5%.
1) The feed water hardness should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content in it, and in severe cases this can affect the quality of the steam. 2) The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the operation of the boiler. 3) The dosing rate should not be too fast, and it must be uniform to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4) Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heated surfaces or block the pipes. 5) Boilers that are already scaled need to have their scale removed first before phosphate treatment can be carried out. 6) Quality inspection should be carried out before drugs are stored to ensure that they meet quality standards; otherwise, the misuse of substandard products can lead to catastrophic accidents. The industrial trisodium phosphate currently in use must meet the following requirements: its purity should be greater than 92%, and the amount of insoluble impurities should be less than 0.5%.
1) The feed water hardness should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content in it, and in severe cases this can affect the quality of the steam. 2) The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the operation of the boiler. 3) The dosing rate should not be too fast, and it must be uniform to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4) Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heated surfaces or block the pipes. 5) Boilers that are already scaled need to have their scale removed first before phosphate treatment can be carried out. 6) Quality inspection should be carried out before drugs are stored to ensure that they meet quality standards; otherwise, the misuse of substandard products can lead to catastrophic accidents. The industrial trisodium phosphate currently in use must meet the following requirements: its purity should be greater than 92%, and the amount of insoluble impurities should be less than 0.5%.
1) The feed water hardness should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content in it, and in severe cases this can affect the quality of the steam. 2) The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the operation of the boiler. 3) The dosing rate should not be too fast, and it must be uniform to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4) Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heated surfaces or block the pipes. 5) Boilers that are already scaled need to have their scale removed first before phosphate treatment can be carried out. 6) Quality inspection should be carried out before drugs are stored to ensure that they meet quality standards; otherwise, the misuse of substandard products can lead to catastrophic accidents. The industrial trisodium phosphate currently in use must meet the following requirements: its purity should be greater than 92%, and the amount of insoluble impurities should be less than 0.5%.
1) The feed water hardness should not exceed 5.0 umol/L; otherwise, a large amount of sludge will form in the boiler water, increasing the suspended solids content in it, and in severe cases this can affect the quality of the steam. 2) The specified range for excess phosphate levels in the boiler water must be strictly controlled; otherwise, either too high or too low phosphate levels are detrimental to the operation of the boiler. 3) The dosing rate should not be too fast, and it must be uniform to prevent a sudden increase in the salt content of the boiler water, which could affect the quality of the steam. 4) Waste discharge must be carried out properly in order to remove the resulting sludge; otherwise, this sludge will adhere to the heated surfaces or block the pipes. 5) Boilers that are already scaled need to have their scale removed first before phosphate treatment can be carried out. 6) Quality inspection should be carried out before drugs are stored to ensure that they meet quality standards; otherwise, the misuse of substandard products can lead to catastrophic accidents. The industrial trisodium phosphate currently in use must meet the following requirements: its purity should be greater than 92%, and the amount of insoluble impurities should be less than 0.5%.