The modified welded plate heat exchanger belongs to the plate-frame heat exchanger. It is suitable for chemical plants and pharmaceutical industries requiring repeated heating and cooling of various chemicals. It is also widely used in heating, cooling, condensation and evaporation of petroleum and coalbed methane.
Performance and advantages of modified welded plate heat exchanger
(1) Thermal efficiency: Because the hydraulic diameters of plate and shell side are very small, and the two media reach high speed, the heat transfer coefficient is more than three times of that of tube type.
(2) Low resistance: the improved welded plate heat exchanger has no corner holes relative to the plate heat exchanger, the flow cross-section area is more than three times larger, and the resistance is 1/3-1/2 of the plate heat exchanger.
(3) Compact structure: optimum 250m²/m³, maximum installed area 600m² and maximum capacity 2000m³/h. Under the same conditions, the heat transfer volume is 1/3 of the shell-and-tube type.
(4) Strong structure and high pressure resistance: Because the beam elements support each other and are rigid, they can withstand higher pressure or vacuum. The maximum pressure is 2.5 MPa and the temperature is 450 C.
(5) Not easy to plug, easy to clean: due to high media flow rate, smooth between the plates and other factors, dirt is not easy to accumulate, that is, combined scaling open the cover plate is also easy to clean by mechanical or chemical methods. It is suitable for occasions with high viscosity and impurity quality.
Working principle of modified welded plate heat exchanger
The main plate bundles (heat transfer elements) of the modified welded plate heat exchanger are stamped into trapezoidal herringbone corrugated plates or vertical corrugated plates and welded together along the seams of both sides to form an inter-plate passage; the two ends of multiple groups of plate bundles are welded together to form a plate path; the shell path is formed between the plate bundles and the plate bundles, and the cold and hot media are heat exchanged through the plates by countercurrent or cross-flow.