Welded board heat exchangers

Principle of welded exchanger

Welded board heat exchanger consists of a set of boards, lined one after another and welded using the WIG method not using any additional material.

The boards are embossed so that an extensive turbulence is created in the flowing media which enhances the heat transfer and prevents creation of sediments.

It can be stated that the board heat exchangers have several times higher effectiveness than the tube exchangers.

Boards:

ST boards as the basic build elements render the excellent thermodynamic properties to the TENEZ exchangers. The functional surface is polished which together with highly turbulent circulation creates conditions for minimised creation of sediments and pollution.

The routes of media in the set of boards depend on the thermodynamic requirements for the exchanger. To meet the requirements of customers and the operational conditions of technologies, the ST boards with several types of embossing are used. The combination of various perforated boards and variety of sizes with parallel or serial sequence of inter-board channels enables to reach the optimum parameters in operation of the equipment. The exchanger’s body itself is jacketed depending on the pressure.

Application

  • Chemical industry
  • Pharmaceutics
  • Industrial cooling
  • Hot-water stations
  • regulation of chemical and reactive processes
  • tempering of chemical inter-products and final products
  • cooling, heating of cleaning agents
  • cooling and heating of DEMI water
  • recuperation in chemical or refinery processes
  • evaporation or condensation of coolants

Advantages – application and experience from practice

  • welded joint instead of sealing
  • temperatures up to 300 °C
  • working pressures up to 70 bar
  • compact way of construction
  • highly effective transfer of heat
  • negligible volume
  • high resistance to static or dynamic load (pressure, temperatures)
  • high reliability, e.g. steam, thermic oils, edible oils
  • condensation/evaporation
  • heating/cooling
  • high compactness
  • possibility of counter-flowing and parallel flowing of a stream, homogenization influence
  • suitable with respect to the control of the process
  • high reliability at the dangerous media
  • advanced structure, long year experience from operation in the broad spectra of applications

Comparison of performance

Structural design

Materials

  • parts in contact with the product - standard materials : 1.4404/ 1.4571 / 1.4306
  • welded jacketing: 1.4571
  • above-standard materials : 1.4539, Titan – NEW MATERIAL
  • Necks
  • ST 3 DN 25
  • ST 12 / 18 DN 50
  • ST 30 / 40 DN 150
  • all common types of connection

Technical data

Welded board exchangers of serial product line ST 3 ST 12 ST 18 ST 30 ST 40
Number of boards pc 12-120 16-120 16-120 16-200 16-200
Heat-exchanging surface m2 0,2 - 2,7 2,0 - 16,5 3,4 - 25,3 4,8 - 60,8 7,3-91,6
Maximum operational overpressure bar 10/25 10/25 10/25 10/25 10/25
Minimum operational overpressure bar -1 -1 -1 -1 -1
Maximum operational temperature °C 250 250 250 250 250
Minimum operational temperature °C -195 -195 -195 -195 -195
Maximum flow rate m3/h 8,5 35 35 450 450
Length A mm 50-340 100-385 100-385 150-770 150-770
Length B mm 140-420 230-495 230-495 410-1260 410-1260
Connection DN/G mm / " 25 / 1" 50 / 2" 50 / 2" 150 / 6" 150 / 6"
Internal volume I dm3 0,3-2,7 2,1-16,0 2,9-21,7 6,8-85 9,36-117
Internal volume II dm3 0,2-2,7 1,9-15,7 2,5-21,4 5,9-84,1 8,2-115,8
Weight kg 9-25 100-177 136-247 400-1050 500-1310

Cleaning and maintenance:

Compactness of exchangers of this type is their big advantage – exchanger is welded using only one type of material suitable for that application (there is no sealing, copper, nickel)

The cleaning can be performed chemically by flushing with chemical agent; with respect to the structure of an exchanger,the cheapest media can be used, i.e. caustic soda or nitric acid.

Individual approach to customers :

To be able to calculate the type of exchanger for that given application, TENEZ a.s. owns an extensive software. If the request for proposal of exchanger is placed, we are pleased to offer you by return the calculation which is executed with high accuracy using the calculation programs based on sound thermodynamic and hydrodynamic measurements.

The following parameters create basis for calculations:

  • operational heat mode
  • flowing-through quantity or the quantity of the heat passed on
  • operational pressure mode, possible limitations of admissible pressure losses
  • flowing-through media or their physical properties

1.10.2008 - Administrator

Attachment

Welded heat exchangers

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