Safety Considerations for Plate Heat Exchanger Design
During the process, there are some safety
considerations you should notice:
1. Design specifications. The design
specifications of heat exchangers include the types of working fluid and flow,
import and export temperature, working pressure and heat exchanger efficiency. Aerospace
heat exchangers should also include permissible pressure drop, size and quality.
2. Overall arrangement. First you should
choose the type and structure of heat exchangers, the form of fluid flow and
the materials, and then choose the type of heat surface, to consider the
operating temperature and pressure, etc.
3. Heat design. The thermal design of the
heat exchanger includes heat transfer calculation, flow calculation and
determination of size. In addition to technical performance indicators, thermal
design also need heat transfer characteristics (including heat transfer
characteristics, flow characteristics and structural parameters) and fluid and
material thermal activity parameters. According to the design goal, for the
selected variety of forms and heat transfer surfaces, through different angles
to optimize the analysis, provide centralized options.
4. Structure design.
(1) According to the maximum operating
temperature and maximum working pressure, as well as thermal design and
resistance calculation results, determine the material and size of each part to
ensure the performance of the heat exchanger in stable operation.
(2) Depending on the operating temperature,
pressure and fluid properties, choose the welding methods and sealing materials.
(3) To ensure the uniformity of fluid
distribution as the goal, do the head, header, adapter and partition design.
(4) In order to meet the structural design
of thermal and resistance performance, the main components have to be checked
for strength to avoid waste in the extreme working conditions due to lack of
strength.
(5) Consider requirements of maintenance
(including cleaning, repair and maintenance, etc.) and shipping.
For some heat exchangers operating under
special conditions, it is also need to calculate the thermal stress during
start-up and stop periods, calculate structural vibrations due to fluid flow,
or calculate flow rates to reduce corrosion and structure. In short, structural
design and thermal design are same important, the design of heat exchangers
need to be considered two or more things, and should be coordinated
5. Design choice. After complete the
thermal design and structural design of the heat exchangers, provide options,
and then based on the evaluation criteria make decisions. The conditions of the
selection are qualitative, such as mold manufacturing conditions, brazing
furnace size, transport restrictions, delivery date, company policy and
competitive strength, which all will affect the final choice.
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The first system cleaning in place or chemical washing is decidedly simpler but does not always allow you to obtain the desired effect it may not address deeply embedded or inaccessible residues and contaminants, leading to incomplete cleaning outcomes. In such cases, during Plate Type Heat Exchanger Maintenance work, disassembly and complete regeneration is a must.
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