US2014311718A1PendingUtilityA1

Block-type plate heat exchanger with anti-fouling properties

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Assignee: ALFA LAVAL CORP ABPriority: Nov 28, 2011Filed: Nov 15, 2012Published: Oct 23, 2014
Est. expiryNov 28, 2031(~5.3 yrs left)· nominal 20-yr term from priority
Inventors:Mats NilssonJonas Anehamre
F28F 3/08F28F 9/001F28D 9/0037F28F 2245/00F28F 19/02
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Claims

Abstract

An block-type plate that has a stack of heat transfer plates which includes a first heat transfer plate and a second heat transfer plate. At least a part of each of the first heat transfer plate and the second heat transfer plate comprises a coating that i) has a layer thickness of 1-30 μm, ii) is prepared by sol-gel processing, iii) comprises silicon oxide (SiOx) having an atomic ratio of O/Si>1, and iv) comprises ≧10 atomic percent carbon (C).

Claims

exact text as granted — not AI-modified
1 . A plate heat exchanger comprising:
 a top head, a bottom head and four side panels that are bolted together with a set of corner girders to form a sealed enclosure, and a stack of heat transfer plates that is arranged in the sealed enclosure, the stack of heat transfer plates comprising:   pairs of heat transfer plates that are stacked such that a flow path for a first fluid is formed between the stacked pairs of heat transfer plates, wherein a pair of the stacked pairs of heat transfer plates comprises a first heat transfer plate and a second heat transfer plate that are joined such that a flow path for a second fluid is formed between the first and second heat transfer plates, the first heat transfer plate and the second heat transfer plate comprising a coating that   has a layer thickness of 1-30 μm;   is prepared by sol-gel processing;   comprises silicon oxide (SiOx) having an atomic ratio of O/Si>1; and   comprises ≧5 atomic percent carbon (C).   
     
     
         2 . A heat exchanger according to  claim 1 , wherein the first heat transfer plate and the second heat transfer plate has a thickness (m1) of 0.6-1.4 mm. 
     
     
         3 . A heat exchanger according to  claim 1 , wherein each of the first heat transfer plate and the second heat transfer plate has a heat transfer area (m2) of 0.05-0.30 m 2 . 
     
     
         4 . A heat exchanger according to  claim 1 , wherein any of the top head and the bottom head has a thickness (m3) of 45-145 mm. 
     
     
         5 . A heat exchanger according to  claim 1 , wherein each of the four side panels has a thickness (m4) of 35-85 mm. 
     
     
         6 . A heat exchanger according to  claim 1 , wherein each of the corner girders comprises a cross-sectional side (m5) that measures 35-85 mm. 
     
     
         7 . A heat exchanger according to  claim 1 , wherein the sealed enclosure has a volume of 0.02-0.40 m 3 . 
     
     
         8 . A heat exchanger according to  claim 1 , wherein the layer thickness of the coating is 1.5-25 μm. 
     
     
         9 . A heat exchanger according to  claim 1 , wherein the silicon oxide, SiOx, has an atomic ratio of O/Si=1.5-3. 
     
     
         10 . A heat exchanger according to  claim 1 , wherein the coating has a content of carbon of 20-60 atomic %. 
     
     
         11 . A heat exchanger according to  claim 1 , comprising a gasket that is at least partially coated with the coating. 
     
     
         12 . A heat exchanger according to  claim 1 , wherein the first heat transfer plate and the second heat transfer plate are made of stainless steel. 
     
     
         13 . A heat exchanger according to  claim 1 , wherein the layer thickness of the coating is 2-20 μm. 
     
     
         14 . A heat exchanger according to  claim 1 , wherein each of the first heat transfer plate and the second heat transfer plate has a heat transfer area (m2) of 0.6-1.8 m 2 . 
     
     
         15 . A heat exchanger according to  claim 1 , wherein any of the top head and the bottom head has a thickness (m3) of 190-250 mm. 
     
     
         16 . A heat exchanger according to  claim 1 , wherein the layer thickness of the coating is 3-10 μm. 
     
     
         17 . A heat exchanger according to  claim 1 , wherein the silicon oxide, SiOx, has an atomic ratio of O/Si=2-2.5. 
     
     
         18 . A heat exchanger according to  claim 1 , wherein the coating has a content of carbon of 30-40 atomic %. 
     
     
         19 . A heat exchanger according to  claim 1 , wherein the first heat transfer plate and the second heat transfer plate has a thickness (m1) of 0.8-1.2 mm. 
     
     
         20 . A heat exchanger according to  claim 1 , wherein each of the four side panels has a thickness (m4) of 65-175 mm.

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