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DELLOK YONGHUI Sanitary SS304 or SS316L Heat Exchange Condenser shell heat exchanger stainless steel stainless steel heat exchanger
Introduction
Shell and tube heat exchanger, also known as tube heat exchanger, is a widely used heat exchange equipment.
Shell and tube heat exchanger is mainly composed of the following
components:
Shell: mostly cylindrical, with internal tube bundles to provide a
closed environment for the heat transfer process.
Heat transfer tube bundle: is the core component of the heat
exchanger, determines the thermal performance of the heat
exchanger, hot and cold fluids through which heat is exchanged.
Tube plate: used to fix the ends of the heat transfer tube bundle
to ensure the stability of the bundle in the shell.
Folding plate (baffle): installed in the shell, used to change the
direction of the shell process fluid, improve the flow rate,
increase the degree of turbulence of the fluid flow, thereby
enhancing the heat transfer effect.
Pipe boxes: located at both ends of the heat transfer bundle, used
for connecting pipes and distributing fluids.
Working principle
Shell and tube heat exchanger belongs to the inter-wall heat
exchanger, its working principle is: tube and shell process through
two different temperatures of the fluid, the higher temperature
fluid through the wall of the heat exchanger tube heat transfer to
the lower temperature fluid, the higher temperature fluid is
cooled, the lower temperature fluid is heated to achieve the
purpose of the process of two fluid heat transfer.
The type and characteristics
Shell and tube heat exchanger has a variety of types, each type has
its own unique characteristics and applicable occasions:
Fixed tube and plate heat exchanger: simple structure, high
pressure, but may produce large thermal stress, suitable for hot
and cold fluid temperature difference is not occasions.
Floating head type heat exchanger: no thermal stress, between the
tubes and tube cleaning is convenient, but the structure is
relatively complex and costly. One end of the tube bundle of the
tube plate can float freely, completely eliminating thermal stress;
and the entire tube bundle can be extracted from the shell, easy
mechanical cleaning and maintenance.
U-shaped tube heat exchanger: each heat exchanger tube are bent
into a U-shape, the two ends were fixed in the same tube plate up
and down the two areas, with the help of the tube box partition
into the import and export of the two rooms. This heat exchanger
completely eliminates thermal stress, the structure is simpler than
the floating head type, but the pipe process is not easy to clean.
It is the only heat exchanger can be used for high temperature,
high pressure, high temperature difference in the heat exchanger,
suitable for shell and tube wall temperature difference is large or
shell process media scaling need to be cleaned, and is not suitable
for floating head type and fixed tube and plate occasions.
In addition, there are shell and tube with expansion joints steam -
water heat exchanger, wave section type shell and tube steam -
water heat exchanger, segmented water - water heat exchanger and
other types. The main features of shell and tube heat exchanger
include:
Simple structure: easy to manufacture and install.
Low cost: due to its simple structure, the manufacturing cost is
relatively low.
Wide flow cross-section: helps to reduce pressure drop.
Easy scale cleaning: the design makes scale cleaning relatively
easy.
Low heat transfer coefficient: limits its application to some
extent.
Large footprint: due to structural characteristics.
Widely applicable: can be used for high temperature, high pressure
and a variety of media heat exchange occasions.
Field of application
Shell and tube heat exchanger is widely used in industrial
production due to its stable and energy-saving, compact structure,
low maintenance costs and other characteristics. Specific
application areas include:
Oil and gas field: for heat recovery, cooling, heating,
condensation, dehydration and re-cooking process, applicable to
gas, light oil and heavy oil products.
Petrochemical sector: for condensation, heating, cooling, heat
recovery and recooking processes, which can handle a wide range of
organics.
Food industry: for heating and cooling processes of vegetable oils
(e.g. palm oil).
Pharmaceutical and special chemical processes: for condensation and
demisting processes, gas condensation processes for sanitary
grades, recovery processes for water vapor and solvents, and
cooling processes for ammonia synthesis.
HVAC, district heating: for circulating water heating processes,
steam heating, heat recovery processes, etc.
Energy and other fields: such as the seed decomposition process in
alumina production, etc.
Chemical production: as heaters, coolers, condensers, evaporators
and reboilers, etc.
Domestic hot water supply: commonly used in hot water heating
system, low-temperature water air-conditioning system and
continuous hot water production process water.
Selection and maintenance
In the selection of shell and tube heat exchanger, the following
factors need to be considered:
Heating area: according to the flow of hot and cold fluids, the
initial and final temperature and the specific heat capacity of the
fluid to determine.
Heat medium parameters: including the temperature and pressure of
the fluid.
Pressure rating: the use of temperature and the connection
conditions of the interface.
Flow rate control: the flow rate in the tube should take a moderate
range to avoid too large or too small pressure drop and fluid
viscosity effects.
In terms of maintenance, shell and tube heat exchangers require
regular inspection, cleaning and repair to ensure their normal
operation and prolong service life.
FAQ
Q1: How can I prevent tube leaks in tube heat exchangers?
A1: Ways to prevent tube leakage include regular inspection of the
tubes, replacement of damaged tubes, and anti-corrosion measures to
extend the service life of the tubes.
Q2: What are the precautions for routine maintenance of tubular
heat exchangers?
A2: Precautions for routine maintenance of tube heat exchangers
include regular inspection of the condition of the tubes and tubes
and timely replacement of damaged parts; maintaining the
cleanliness of the tubes and regular cleaning of deposits and dirt
in the tubes; and paying attention to insulation and anticorrosion
measures for the tubes and equipment.
Q3:How to choose the suitable tube heat exchanger?
A3: Selecting a suitable tubular heat exchanger requires
consideration of a number of factors, including operating
conditions (such as temperature, pressure, fluid properties, etc.),
heat transfer efficiency requirements, floor space limitations, and
cost budget. When making a selection, you can consult a
professional heat exchanger manufacturer or supplier to customize
the selection according to specific needs.