Block-type heat exchangers
A block-type graphite heat exchanger represents one or several rectangular/cylindrical blocks having two sets of non-intersecting perpendicular openings that for minter secting routing for heat–carrying media. The apparatus possess arrange of valuable properties: they are effective since graphite’s thermal conductivityis 4 times as high as that of corrosion-resisting steel; they are highly resistant to aggressive media (acids, alkalis (special resin is used), organic and nonorganic solvents); relatively cheap, compact and easy for maintenance. The main method to connect graphite-based components is adhesion with the use of special structures. Each set of openings is provided with graphite covers for working media input and output. Metalplates arelaidontop of the covers and the system is tightened with bolt screating least critical compressing stresses for graphite. Rectangular block-type graphite heat exchangers are used asboilers, condensers and coolers. Neutral medium is not conveyed through a steel shell but is transferred from one block to another by means of cast-iron screens. This system is very convenient for maintenance. The apparatus has a vertical design. Block-type heat exchangers are widely used at chemical industry works.
Block-type heat exchangers can be easily mounted in consecutive and parallel rows due to which it is possible to select the required throughput capacity of heat exchangers as well as the necessary differential pressure for heat-carrying media.
In single aggressive medium apparatus the medium is supplied into vertical channels and the inert atmosphere is supplied into horizontal channels. Single aggressive medium apparatus have a one or two pass design for the aggressive medium and a multiple pass design for the neutral medium.
In double aggressive medium apparatus media are supplied into channels of any direction. Such apparatus have a single, double and quadruple pass design for vertical direction and a multiple-pass design for horizontal direction.
The heat exchange surface quantity of the apparatus depends on the type, number of blocks and the diameter of the channels. The heat exchange surface is formed by rectangular blocks. Mutually perpendicular nonintersecting channels are designed for the conveyance of working media inside the blocks.
Main parameters of block-type heat exchangers*
|Conventional designationof the apparatus||Engineering documentation set index||Heat exchange surface, m2||Working pressure,МPa(kgf/cm2)||Calculated pressure,МPа(kgf/cm2)||Working media temperature, °С||Calculated pressure, °С||Max. weight, kg|
|HG-B/V1-22B1-14.6||16.0001||14.6||0.7(7.0)||0.8(0.8)||between -30and +250||270||964|
*The apparatus configuration can be changed upon a customer’s request.
Conventional designation (example): HG-B/V1-1B1-10.8
HG –heat exchanger,graphite
B – block-type
V1 – vertical-type, one pass
B1 – type of block
10.8 – heat exchange surface, m2