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Westcome develops and sells heat exchangers for high viscose flow such as sludge from sewage
treatment plants and slurry from biogas plants and similar substances. Our heat exchangers are compact
and flexible in all lengths, widths and heights. Westcome heat exchangers are delivered as standard as
insulated heat exchangers in stainless steel, or black steel tailored to the job
Self-cleaning sludge / Sludge heat exchanger
The shown heat exchanger V3 is designed to treat
sludge/sludge and/or sludge/water
Sludge/sludge heat
exchangers are
available as selfcleaning when
mounting the shown
valve system on
WWTP
Westcome
FOULING
Fouling (or baking, as it is also called) can occur, if the mean difference temperature inside the heat
exchanger is too high, resulting in proteins, sugars or other parts of the sludge fouling on the insides of
the heat exchanger, reducing the heat exchange between the two flows and increasing the pressure
drop over the heat exchanger. Fouling is prevented by eliminating a hot zone or ensuring that the heat
exchanger efficiency is high enough.
Westcome heat exchangers are designed for heat exchange on
flow with high viscosity, high efficiency and low operation
costs.
Westcome heat exchangers are designed completely without
seals or moving parts. Based on more than 10 years of
experience, we regard the maintenance cost to be non-existing.
Patent DK 178 079 B1 – Patent Pending EP 3 037766 A1
Registered in USA - China
Forced turbulence
Low flow rates and implementation of baffles in the heat exchange tubes, keep the mass turbulent down to 0.25
m/sec. by means of forced stirring instead of using high speeds.
The tubes throughout the
exchanger have the same
cross section, which means
that the flow rate remains
the same, eliminating the
risk of ”hot zones” and
”dead zones”, thus the risk
of clogging due to fouling.
Westcome heat exchangers are designed with ”near quadratic”, rectangular channels, meaning that the flow
remains nearly the same throughout the cross section due to the low flow rate. The baffles result in forced stirring,
both rotating the mass inside the tube and blending the mass. The stirring effect can be designed to the mass
viscosity by means of angle, size and design of the baffles.
Westcome heat exchangers at biogas plants
Biogas plants with added sludge and other
biomass such as straw, corn,
slaughterhouse offal etc. will have
ammonia, phosphorus, magnesium etc.
Slurry/water - 6 - 8m3/h / flow /0.3–0.6m/
sec. U-value W/m2*k 416 / effect 384 KW
Back pressure / 0.2 - 0.6 Bar
Cleaning of heat exchangers at biogas plants
Polymer can be injected in the hot outgoing,
degassed mass from the digestion tanks, prior
to the heat exchangers in order to keep the
heat exchangers clean and free from struvite
and avoid deposits that reduce the efficiency
between the channels of the heat exchanger
and further increase the pressure drop over
the heat exchanger.
Polymer KEM Guard 5872 is added
with 20 ppm at a ratio of 1 ton/biomass.
Flexibility of the heat exchanger
In case of difficult accessibility, the heat exchanger can be delivered in customised elements, making it possible to
install them in the buildings.If the location, where the heat exchanger is to be installed, is inappropriate as to
length or width, we can fully adapt it to the conditions existing at the installation site.
Operation with different heat exchanger flow rates is possible.
It may in terms of process be favourable to operate with different flow rates on the two circuits. This is possible, if the
operating pressure of the heat exchanger is not exceeded. The option of using different flow rates is e. g. possible when
using a heat exchanger in combination with heat pumps, resulting in increased efficiency. The results of using this option
are illustrated below.
14 m³/h Ingoing cold flow with a temperature of 12 C
̊ .
Velocity Press loss. Mean⁰C. Effect KW U Value
14 m³ / - 12 ⁰- 54 ⁰ – 37 ⁰ - 36⁰
28 m³ / - 12-⁰ 54 ⁰ – 39 ⁰ - 39 ⁰
45 m³ / - 12-⁰ 54 ⁰ - 43 ⁰ - 42 ⁰
0.31
0.61
0.97
0.36
1.47
3.77
21
20
18
350
422
457
347
375
389
Westcome heat exchangers in
combination with heat pumps deliver
process heat, replacing biogas or other
kind of energy for the plant process
heat etc.
Such an installation includes 3 HEX
1. 1 x slurry/slurry
2. 1 x slurry/brine
3. 1 x brine/slurry
The plant COP will be from 8 – 14.
Layout drawings of different combinations of biogas plants that reduce the costs for process energy and further
reduce the temperature of the degassed mass, resulting in reduced ammonia evaporation.
Preben Jensen CEO
+45 28 11 91 05
Mail pj@westcome.com
Skype:Prebenjensen.615
Tom Pallisgaard Jensen CTO
+ 45 20 99 51 30
Mail tpj@westcome.com
Skype: tompallis
Werner Schildorfer / Consultant
Germany
+ 49 176 544 36 939
Mail ws@westcome.com
Skype: Schildorfer