Wastewater parameters for sulfur production furnaces using sulfur
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For sulfur production furnaces using sulfur as raw material, what level should the phosphate content in boiler water be controlled at?
The wastewater discharged from the main boiler and tail boiler drum, along with that from stages 1, 2, and 3 of the sulfur coolers, is combined and sent to the salt-containing wastewater tank. After being cooled by water, this salt-containing wastewater meets the following specifications: phosphate level < 25 ppm, and conductivity < 8000 μs/cm. Is this conductivity value correct? Isn’t 8000 a bit high? (The drum produces medium-pressure steam at 4.0 MPa)
The water discharged from a boiler cannot have such a high conductivity; it is estimated to be at most 200 uS/cm. If the conductivity were that high, the salt content would be over 1%. If a boiler operating under a pressure of 4 MPa can still function properly, then that boiler must be blessed by some supernatural force.
The specification given in our process design document is a conductivity of <8000. Could this be a mistake? What are the specifications for the wastewater discharged from your boilers?
This post was last edited by qugd on 2019-3-13 at 15:45. I am unable to assess the data in your process design documentation; perhaps your boiler is special and different from other boilers. Process instructions must be prepared by people with high technical expertise, and it is advisable to trust them. Do you work on the design of thermal instruments for boilers and similar equipment? You can look up standards and specifications. We don’t have a boiler here, so there is no boiler drainage either; therefore we are unable to answer your question.
Analysis Sample, Analysis Item, Unit, Analysis Frequency, Analysis Method, Indicator: Deoxygenated Water – pH: 2 times per day; GB/T 6904.3-93; Range: 8.8–9.3. Hardness: μmol/L; 2 times per day; Limit: ≤2. Dissolved Oxygen: μg/L; 2 times per day; Limit: ≤15. Reaction Furnace Water – pH: 2 times per day; GB/T 6904.3-93; Range: 9–11. Phosphates: mg/L; 2 times per day; GB/T 1576-2008; Range: 5–15. Conductivity: μs/cm; 2 times per day; No specific limit specified. Burning Furnace Water – pH: 2 times per day; Range: 9–11. Phosphates: mg/L; 2 times per day; GB/T 1576-2008; Range: 5–15. Conductivity: μs/cm; 2 times per day; No specific limit specified. Reaction Furnace Steam – Sodium Ions: μg/L; 2 times per day; Limit: ≤15. Conductivity: μs/cm; 2 times per day. Silica: μg/L; 1 time per day; Limit: ≤20. Fe3+: μg/L; 1 time per week; Determined by o-phenanthroline titration; Limit: ≤20. Cu2+: μg/L; 1 time per week; Limit: ≤5. Condensate Water – pH: 1 time per day; GB/T 6904.3-93; Minimum value: ≥7. Conductivity: μs/cm; 1 time per day; Limit: ≤10. These are the control parameters for the water and steam in a sulfur recovery unit. It is generally the conductivity of boiler water that is monitored, while the control parameters for wastewater are not very clear. But you guys are really too tall! I’ll go check some information!