A plate heat exchanger with an insert support

Abstract

The invention relates to a plate heat exchanger provided with internally-inserted supports. The plate heat exchanger comprises a plate heat exchange unit, the intra-plate supports, a shell, seal plugs, separation fences and side connectors. The plate heat exchange unit is composed of a plurality of parallel plates partitioning the space in the shell into two runners, wherein the two runners do not communicate. Different from existing corrugated plates, the plates are supported by the intra-plate supports instead of making direct contact with one another, and the pressure on the two sides of each plate is balanced. The intra-plate supports are integral plates of spiral twisted band structures, are arranged between the plates, and are preferably arranged on the sides, with the lower pressure, of the plates, or the two sides of the plates. The spiral twisted band structures interfere with fluid to facilitate heat transfer. The plate heat exchanger provided with the internally-inserted supports has the advantages that high pressure and high pressure differences are borne, the reliability is improved, cleaning and maintenance are convenient, and the manufacturing cost is lowered.

Description

technical field [0001] The invention relates to industrial heat exchange equipment, in particular to a plate heat exchanger. Background technique [0002] Since the plate heat exchanger came out in 1878, it has developed rapidly in recent decades and has been widely used in various industries such as food, pharmaceuticals, chemicals, metallurgy, and electric power. Plate heat exchangers usually stack metal sheets with odd and even plates with opposite corrugation directions, and press them at both ends to form heat exchange channels. Compared with the traditional shell-and-tube heat exchanger, the plate heat exchanger has the advantages of compact structure, large average temperature difference of heat transfer, high heat transfer efficiency at low flow rate, convenient installation and maintenance, etc., especially suitable for the recovery of low-grade heat energy, high Viscous fluid heat transfer. But there are also the following problems: [0003] 1. It is difficult t...

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Problems solved by technology

[0003] 1. It is difficult to withstand high pressure and high pressure difference. Limited by the pressure resistance of the sealing gasket, the working pressure of the detachable plate heat exchanger is generally not higher than 2.0MPa. The fully welded plate developed by Finland VAHTERUS and China Gansu Lanke Petrochemical, etc. A plate-and-shell heat exchanger is formed in a cylindrical shell, and the pressure resistance can reach 8.0MPa, but the welding range is large, and at the same time it loses the advantages of easy cleaning and maintenance, and the application field is limited.

[0004] 2. Sensitive to dirt. Since the peak contact of adjacent plates forms a support and the distance between the plates is small, scaling will easily increase the flow resistance or block the flow channel, resulting in a decrease in heat transfer efficiency or frequent disassembly and cleaning, so it is not applicable Liquids with solid particles or fibers (such as sewage, flue gas) or solutions that are prone to crystallization during heat exchange

[0005] 3. Not suitable for high flow rate occasions (such as gas heat exchange)

Because the flow channel is too narrow and the gas flow resistance is high, the plate heat exchanger is rarely used in gas heat exchange (such as flue gas waste heat recovery, compressor inter-stage cooler) and other occasions.

[0006] 4. Not suitable for surface evaporation occasions (such as evaporative condensers)

The convex points pressed by the plate are used as support, the fluid is not easy to distribute evenly in the wedge-shaped flow channel, and the ability to withstand the pressure difference is weak

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