Problems with crude oil heating furnaces

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Our unit’s crude oil heating furnace normally maintains an outlet temperature of 120 degrees, a flow rate of 90 tons per hour, and a pressure of 1000 KAP, with the valves in the fully open position. Now, the leaders need to increase the workload, raising the processing capacity to 100 tons per hour. But a strange phenomenon occurred: when the processing rate reached 100 tons per hour, the outlet temperature was above 128 degrees and the pressure was at 1200 KAP. After a month, the output from the heater’s outlet pipes decreased. Calcium sludge was removed from the pipes, and after acid cleaning and restart, the system was able to reach its previous capacity. However, it didn’t take long before the output started to decline again. Once the temperature exceeded 124 degrees, the output gradually decreased day by day, until the outlet temperature dropped to 120 degrees and the output was 90 tons per hour, with the pressure remaining stable at 1000 KAP. When the control room reduced the temperature to 115 degrees, the output increased slightly to 92 tons per hour. I’ve been thinking about this problem for almost half a year without finding the reason. Therefore, I seek the guidance of experts to correct my mistakes. Thank you! https://attach01.hcbbs.com/forum/202207/03/172719uc8hqbb848b24b2l.jpg Pipe blockage