Optimize Industrial Evaporators

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How to Optimize Industrial Evaporators?

• Alaquainc.com

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An evaporator is a heat exchanger that is
designed to heat a certain compound while still
separating water by evaporation. Alaqua Inc
supplies different kinds of evaporators
technology for food, pharmaceutical, and other
processing industries to fulfil the industrial
processing equipment demands.
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Evaporators have traditionally been used in
manufacturing processes. In the food industry,
for example, water is removed from foods to
maximize the concentration of the solid portion,
achieve the optimal flavor and appearance, and
extend shelf life. Another example is the
pharmaceutical industry, where eliminating
humidity improves the chemical stability of the
finished product. Evaporators have begun to be
used for energy generation in recent years. In
this scenario, the steam is expanded in a reactor
after it has been evaporated.
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This form of an evaporator, also known as
calandria or Robert, was the first to be commonly
used in manufacturing and is still used today. At
the bottom of the shell, inside a small tube
evaporator, a bundle of heat exchange tubes is
enclosed in another steel cylinder (also known as
calandria). Steam enters the cylinder and heats
the tubes, and heats the compound, which must be
dehumidified. The steam and the dehumidified
compound will escape from the upper and lower
parts, respectively, at the end of the
evaporation period.
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A heating section (also known as a steam chest)
and a vapor/liquid separation section are found
in any evaporator. The heating component can be
external to the vessel that houses the
vapor/liquid separation section, or it can be
housed within a single vessel (body).Evaporators
may be made up of one or more results, each of
which consists of one or more bodies acting at
the same boiling point. The vapour from one body
heats a second body with a lower boiling
temperature in a multiple-effect evaporator. The
first effect is directly heated by steam, and the
bodies after that are arranged according to their
boiling temperatures (or pressure).
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To lower the boiling temperature, evaporator
bodies are usually worked under a vacuum. To
generate a vacuum, steam ejectors or mechanical
vacuum pumps are often used. A single pump or a
series of pumps can be used, depending on the
amount of vacuum needed for the last result,
which has the lowest boiling point.
Non-Condensable gases that emerge as dissolved
gases in the feed or from air escaping into the
evaporator body are often removed by vacuum
systems. To condense the vapour leaving the last
evaporator effect, most evaporation systems have
either a direct or indirect water-cooled
condenser. This raises the system's vacuum. Since
the vapours produced are completely condensed
inside the heating portion of the evaporator,
mechanical vapour recompression (MVR) (discussed
later) evaporators do not need an external
condenser.
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The primary way to improve an evaporator's steam
economy is to reuse the latent heat of the water
vapour. The water vapour from one effect is used
as the heating medium for the next effect, which
has a lower boiling point. The latent heat in
water vapour may also be reused by compressing it
to a higher pressure and temperature, either
thermally or mechanically. These three methods of
increasing performance, however, have limitations
that are determined by the physical properties of
the liquid feed being evaporated.
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