Issues with use and manufacturing of spiral plate heat exchangers with two inlets and two outlets

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Hello everyone. Our factory has newly installed two spiral plate heat exchangers with a heat exchange area of 8㎡ each, featuring two inlets and two outlets, along with large flange end caps at both ends ； It is used to cool the heavy-phase liquid at the bottom of the tower (containing a high amount of solid impurities at 95°C), while heat exchange takes place with the light-phase liquid at room temperature (a clean liquid at 20°C) on the other side. Previously, plate heat exchangers were used in the heat exchange equipment; cleaning, disassembly, and reassembly were required frequently, resulting in high workload and costs. However, after modifying the spiral plates, it was found that clearing blockages was not as easy as expected; there were many columns used to secure the layers of plates, which made the process of clearing blockages very troublesome, and the solidified materials were difficult to remove ； During this process, it was found that the partition layer between the inlet and outlet on one side of the spiral plate cannot be sealed using large gaskets to enable circumferential flow between the various layers on that side; instead, some of the fluid on the inlet side can flow directly from the inlet to the outlet without passing through the circumferential interlayer. Is there a problem with the manufacturing design standards for spiral plates in this regard? For operating conditions like ours, where cleaning and maintenance are required every 20 days, are there any good heat exchange designs that could serve as a reference? Thank you