With its good structure and heating effect, plate heat exchangers are often used in many heat exchangers. What is the structure and principle of plate heat exchangers? Today, I will introduce it to you. Understanding his knowledge makes it easier for everyone to choose.
The plate heat exchanger is composed of upper and lower guide beams, fixed pressure plates, movable pressure plates, pipe interfaces, heat exchange plates, plate seals, compression bolts and other components.
The heat exchange plates are assembled according to the process requirements. Seals are glued around the holes of the fixed platen and the movable platen. During assembly, the side of the heat exchange plate with the sealing member facing the movable platen, the plate groups that are alternately combined form cold and hot fluid channels on both sides. The channel communicates with the corresponding medium through an external pipe interface, and realizes heat transfer between the two mediums to meet predetermined overflow control requirements.
The heat transfer plate is the core component of the heat exchanger. The forming process and material characteristics of the plate will directly affect the sealing and heat exchange efficiency. The heat exchanger usually uses water as the cooling medium. Most of the plates are made of stainless steel thin plates. Corrugated flow tips are pressed on the plates. The space between two adjacent plates is the medium flow channel. Cold and hot fluids are on the two plates. For side flow, heat is exchanged through the plates.
The special flow channel formed by the ripple makes the fluid turbulence under the condition of extremely low flow rate (Reynolds coefficient R. about 200). The turbulence at low Reynolds coefficient has its own descaling effect, which effectively destroys the insulation boundary layer and reduces Thermal resistance of the liquid film at the interface. In general, the heat transfer coefficient K of the plate heat exchanger is in the range of 3 000-6 000 W / m '° C. At the same time, the two media are almost completely countercurrent flow, and the heat transfer efficiency is high. At the same heat exchange efficiency, the plate heat exchanger only needs 1 / 2-1 / 4 of the area of the shell and tube heat exchanger to achieve the same heat exchange effect.
After using the plate heat exchanger for a period of 1 to 2 years (depending on the actual operating conditions), it is necessary to perform the necessary disassembly inspection, cleaning, and pressure testing. Defective or perforated plates need to be replaced in a timely manner. In the process, the assembly of heat sink plates must be arranged strictly according to the flowchart. The flow chart is designed according to the cooling process. The plates are connected in parallel or in series. Common single-flow and dual-flow (or multi-flow combination) heat exchangers are used. The outflow nozzle is usually fixed on one side of the platen, and the hot and cold media are arranged on one side of the vertical axis of the fixed platen respectively, and the same medium is on the left side or on the right side at the same time.
The plate heat exchanger is introduced here today. We need to know the relevant knowledge of the plate heat exchanger so that we can choose more conveniently and choose according to our actual needs. After that, I will continue to share the relevant knowledge of plate heat exchangers, and everyone can continue to pay attention.