»
»
»
Plate Heat Exchangers
Titanium-Palladium Alloy Titanium palladium alloy is an alloy formed by adding a small amount of precious metal Pd to pure titanium , which has excellent corrosion resistance to acidic media . And due to the addition of Pd element , the resistance to crevice corrosion in high chloride ion concentration media has been greatly improved . Titanium palladium alloy is highly suitable for high temperature , high concentration , and low pH chloride solutions .
Hastelloy C276 Ultra-low carbon nickel alloy is almost unaffected by chloride ions in low pH media . It is widely used in organic acids , hydrofluoric acid hydrochloric acids , phosphoric acid , chloride and fluoride and so on . It also has excellent corrosion resistance to various sulfuric acids especially for 98 % sulfuric acid below 95 º C .
Nickel 200 / 201 Pure nickel plate containing more than 99 % nickel . Mainly used for high temperatures ( up to boiling point ) and high concentration ( 50 % -70 %) caustic solutions ( NaOH , KOH , etc .)
The corrugation shape : the core of heat transfer The corrugated form is important because it will determine the flow of the fluid and therefore , the turbulence and the pressure drop that the fluids will be subjected to , which affects the efficiency they exchange heat .
Herringbone corrugation The herringbone corrugation is a highly optimized corrugation design in plate heat exchangers . Its main feature is that the ripples present alternating V-shaped or inverted V-shaped patterns , forming a pattern similar to a herringbone . This design has a significant impact on heat transfer performance and fluid flow . 1 . Enhance turbulence effect : The herringbone corrugations create complex flow paths for fluid between heat exchange plates through staggered corrugation directions . The staggered ripples will increase the turbulence level of the fluid . The enhancement of turbulence helps to break the boundary layer of fluid on the plate surface , promoting the efficiency of heat transfer from hot fluid to cold fluid . This makes the heat transfer
performance of the herringbone ripple very superior , especially in situations where efficient heat transfer is required .
2 . Reduce fouling accumulation : Due to the ability of herringbone ripples to increase the turbulence level of fluids , the turbulence formed on the surface of the ripples can reduce the deposition of dirt . This characteristic makes the herringbone corrugation particularly effective in handling fluids with high fouling coefficients , reducing the cleaning frequency and maintenance costs of the heat exchanger .
3 . High mechanical strength : The staggered corrugated structure enables the plate to distribute stress more evenly when subjected to fluid pressure , reducing the possibility of plate deformation . Therefore , the herringbone ripple is particularly suitable for high-pressure and hightemperature environments .
4 . Design optimization : In the design and manufacturing process , the angle ( usually between 60 ° and 120 °) and depth of the herringbone corrugation can be optimized according to specific applications . This customized design enables the heat exchanger to achieve optimal performance in practical applications . Therefore , it is widely used in petrochemical , natural gas , food and beverage , HVAC , marine and other occasions .
Wide gap channel shape The wide gap plate heat exchanger is a type of heat exchanger specifically designed to handle fluids with high viscosity , containing particles or fibers . Compared with traditional plate heat exchangers , the plate design of wide channel plate heat exchangers is significantly different to meet special application requirements . Large channel : The ripple shape of this type of plate is usually relatively gentle to ensure that a certain turbulence effect can still be maintained in a wider channel . The channel width between the plates is generally between 5 millimeters and 20 millimeters , depending on the properties of the fluid and application requirements . Compared to the deep ripple design of traditional plate heat exchangers , the ripples on the plates of wide gap plate heat exchangers may be closer to parallel ripples or shallow V-shaped ripples . This design can effectively prevent blockage of high viscosity fluids and reduce pressure drop , making wide channel heat exchangers particularly suitable for handling fluids containing particles , fibers , mud , or other difficult to handle fluids .
Low angle corrugation plate pattern . High angle corrugation plate pattern .
Wide gap channel design in the plate . www . heat-exchanger-world . com Heat Exchanger World December 2024
31