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Different Types of Plate Heat Exchangers Application

Different Types of Plate Heat Exchangers Application

  • Categories:Industry News
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  • Time of issue:2021-08-23
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(Summary description)The heat transfer surface from a gasketed plate and frame heat exchanger is constituted by a series of plates, see Figs. and containing portholes, for fluid entry and exit

Different Types of Plate Heat Exchangers Application

(Summary description)The heat transfer surface from a gasketed plate and frame heat exchanger is constituted by a series of plates, see Figs. and containing portholes, for fluid entry and exit

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2021-08-23
  • Views:0
Information
Around 1850, French wine producers invited Louis Pasteur to solve a problem related with wine deterioration. Comparing samples of good wine with samples of deteriorated wine, Pasteur found several strains of microorganisms. Therefore, pasteurization was invented, this operation being widely used nowadays in the dairy and food industries. Later on, Pasteur broaden his studies to beer and, in 1857, he published one work showing that milk sours due to the presence of some micro-organisms.
The first patent for a plate heat exchanger was granted, in 1878, to Albretch Dracke, a German inventor, but the commercial embodiment of these equipments has become available from APV International, England, in 1923. 
In 1996, the total market for heat exchangers in Europe amounted to USD 3.6 billion and the plate heat exchanger had a market share of 13%. Modernplate heat exchangers provide higher working temperatures, larger working pressures, higher resistance to chemicals, etc.. Due to this, different types of plate heat exchangers are nowadays applied in a very broad range of industrial heat exchanger needs.
The heat transfer surface from a gasketed plate and frame heat exchanger is constituted by a series of plates, see Figs. and containing portholes, for fluid entry and exit, in the four corners. When the plates are pressed together, the portholes form continuous tunnels, leading two fluids (for instance) from the inlet into the plate package, the different fluids being distributed to alternate narrow passages, always in counter-current flow. The presence of gaskets prevents the leakage of fluid from the passages to the surrounding atmosphere.
Brazed plate heat exchangers were developed in the late 1970's . However, copper brazed units did not start selling until the early 80's. Nickel brazing came to market around ten years later, since copper presents compatibility problems with some streams (e.g. ammonia). Copper or nickel foils are placed in between each of the stainless steel plates and a pile of plates is placed in a furnace just above the melting temperature of the foils.
The all-welded and semi-welded plate heat exchangers were developed during the 1980’s and early 90's . All-welded plate heat exchangers use plates similar to those in gasketed plate and frame heat exchangers, the laser welds being applied along the edges, in the plane of the plates. Since the plate edges are all sealed by welded joints, this allows the increase of typical maximum operating temperatures and pressures (350ºC and 40 bar). Brazed and all-welded plate heat exchangers has a same drawback since they cannot be dismantled for mechanical cleaning and, therefore, their use is restricted to applications where fouling does not occur
. The all-welded plate heat exchangers are intended for thermal processes with severe duty requirements that often involve handling of highly aggressive and corrosive fluids. 
In years to come, with increased choice of better heat exchange equipment, the impetus of adopting equipment that a different industry already uses will decrease. 
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