I have a problem with the wet flue gas desulfurization system and would like to seek advice from experts

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Using soda ash as the absorbent and cobalt cyanide as the catalyst, with a solution flow rate of 850 cubic meters per hour, spray regeneration is employed; the nozzle pressure is 0.56 aPM. Twenty nozzles are used, the solution temperature is 43 degrees, and the flow rate per nozzle is 50 cubic meters (the design flow rate). Question: When the machine was first started, the solution circulation rate was 960 cubic meters per hour; 16 nozzles were in use, and the nozzle pressure was 0.48 aPM. In other words, why is the resistance in the solution system so high? What’s the problem? We suspect that the nozzle is blocked (nothing was found wrong when it was opened and cleaned), and we also suspect that the valve isn’t fully open (no problems were detected upon inspection). Why is there such high resistance from the solution pump to the nozzle? What is the cause of this problem? We hope experts can provide an answer!