Graphite Heat Exchanger

Heat exchanger series is the most advanced design of polyblock heat exchangers. These are constructed from identically formed impervious graphite blocks with two types of passages viz short radial passages of 100 to 150mm length converging into a central cavity and short length axial passages with remixing of all the axial tube fluids in a mixing cum redistribution channel every 150 to 300 mm travel of the axial fluid. This particular feature of hydraulic design gives abundant turbulence even at low flow rates and enhances the 'u' and reduces the fouling & scaling drastically. The effect of high 'u' and lower fouling coefficient 's' is that for the same heat duty the hta value is lower. Due to their main features of robustness, high mechanical strength and exceptionally long working life, these heat exchangers are widely used in pharmaceutical industries, pesticide and fumigant sectors, dye stuffs, other chemical process industries, petrochemicals, phosphate fertilisers and pickling lines of steel rolling mills etc.

Construction Details

The heat exchanger assembly is made from a stack of cylindrical impervious graphite blocks, depending upon the hta requirement and the desirable fluid flow rates.the stack of blocks is fitted with headers at both the ends.the graphite blocks and headers are housed in an ms shell for service fluid passage and also to impart protection and mechanical strength to the assembly. To separate the blocks and isolate the flows, teflon gaskets are used between each blocks. The stack of blocks is held tightly under compressive load using disc or spring washers on long pin bolts and nuts assembly. Deflector plates are used on entry nozzles to avoid direct impingement.
isolating bellows are require on each of the inlet/outlet nozzles.