Design of the pre-filter in the condensate polishing system?
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In power plant operations, when a new unit is started up, the pre-filters in the condensate water polishing system use startup filter elements with a pore size of 10 microns. However, as the pressure at the outlet of the condensate water pump increases, so does the flow rate; the inlet flow rate to both pre-filters exceeds 500 T/H. If the flow rate is above the designed level, it may be that after backwashing the filters, no improvement is achieved, and the pressure difference between the inlet and outlet approaches the limit set for such filters in a short time, rendering backwashing ineffective. We are seeking advice from expert designers on this issue.
As the flow rate increases and the pressure rises, the pressure difference across the filter certainly increases. As for whether this pressure difference will reach its maximum value in a short time, it depends on the extent to which the flow rate and pressure deviate from the design values； You can ask the filter manufacturer to do the calculation.
I found out later that the designed output of the filter is 700 T/H, which is within the acceptable range; I’m still investigating why this situation occurred...