High sodium ion concentration in the saturated steam of the external heat drum
Thread Content
Regenerator charring occurs during oxygen-enriched regeneration; excess heat is removed through steam generation in an external heat extraction drum to maintain thermal balance. Over the past year, the water quality parameters of the external heat recovery steam generator have been satisfactory, but when the steam production exceeds 30 t/h, the sodium ion level in the steam becomes extremely high. Previously, drainage was carried out once a week; now it has been increased to once a day, yet the effect is not significant – with higher steam production, the levels still exceed the allowed limits. Dear HaiChuan community members, has this situation occurred with your external heat steam drums after several cycles of operation?
Was it qualified before? During this period of exceeding the limits, was the phosphate level controlled at a higher level than before? It is recommended to keep the phosphate level at the lower limit of the acceptable range, and also try lowering the liquid level slightly
The unit has been in operation for three cycles; this issue only appeared after 6 to 7 years of operation. The phosphate levels are normal, as is the pH value. The liquid control level is at 40, and when the steam generation volume is slightly high, the sodium ion levels increase. It is now suspected that salts have accumulated at the bottom of the heat exchange tubes, and when the amount of steam is high, it exacerbates disturbances in the tubes at the very bottom