I. Basic Product Category Knowledge Q&A (Essential for Import Procurement)
1. What are the main types of industrial heat exchangers? What are their core application scenarios?
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- Shell and tube heat exchangers: These have the strongest industrial versatility, consisting of a shell, heat exchange tube bundle, and tube sheet. They are robust, pressure-resistant, high-temperature resistant, and impact-resistant, suitable for high-pressure, high-temperature, and high-viscosity media. They are mainly used in heavy industries such as petrochemicals, power generation, metallurgy, large-scale HVAC systems, and shipbuilding, and are the preferred choice for large-scale overseas engineering projects.
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Plate heat exchangers: Composed of metal heat exchange plates, gaskets, and clamps, they have high heat exchange efficiency, are compact in size, and are easy to assemble and disassemble. They are suitable for medium and low pressure and medium and low temperature working conditions and are widely used in food and beverage, pharmaceutical, HVAC, light industry, water treatment and other industries. They are the mainstream product category for small and medium-sized overseas trade orders.
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Spiral heat exchanger: Utilizing a spiral flow channel structure, it offers excellent fluid turbulence, is less prone to scaling, and has strong self-cleaning capabilities. Suitable for high-viscosity, easily scaling, and impurity-containing media, it is widely used in chemical waste treatment, oil processing, and sewage treatment.
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Air-cooled heat exchanger: Using air as the cooling medium, it requires no water resources, making it suitable for water-scarce areas and outdoor working conditions. Primarily used in oil and gas industries, power plants, remote mining areas, and other overseas projects in water-scarce regions.
2. What are the core advantages of imported heat exchangers compared to locally produced equipment?
- Enhanced process stability: Precision welding and mature flow channel design ensure consistent heat exchange efficiency, resulting in lower energy consumption over long-term operation and a significantly lower failure rate than ordinary low-end domestic equipment.
- Superior material corrosion resistance: Utilizing high-end stainless steel, titanium alloys, and duplex steel, it is suitable for complex acid and alkali environments and corrosive media, offering a longer service life and adaptability to harsh overseas operating conditions.
- Comprehensive compliance standards: Generally compliant with international industry standards, it comes with a complete set of certification documents, meeting the acceptance requirements of projects in Europe, America, the Middle East, Southeast Asia, and other countries.
II. Q&A on Core Selection Parameters (Core Basis for Procurement)
1. What are the key operating parameters that must be confirmed when selecting an imported heat exchanger?
For all foreign trade purchase orders, five core parameters must be verified in advance to avoid mismatched selections, returns, and rework. The details are as follows:
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Medium parameters: Type of hot or cold fluid (water, steam, heat transfer oil, acid/alkali solutions, crude oil, etc.), medium concentration, viscosity, corrosiveness, scaling tendency, and presence of impurities or particulate matter.
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- Temperature parameters: Inlet and outlet temperatures of hot and cold media, maximum withstand temperature, allowable temperature rise, distinguishing between normal and extreme operating conditions.
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- Pressure parameters: Rated working pressure, maximum pressure bearing capacity, allowable pressure drop; shell-and-tube structures must be preferred for high-pressure applications.
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Flow parameters: Normal flow rate of the medium, maximum/minimum fluctuating flow rate, directly determining the heat exchange area and dimensions of the equipment.
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Operating conditions: Continuous/intermittent operation, load fluctuation range, installation environment (indoor/outdoor, dry/wet, corrosive atmosphere).
2. What are the main reasons for substandard heat exchange power and poor heat exchange effect?
- Selection parameter deviation: The heat exchange load was not calculated based on the actual maximum operating conditions, resulting in undersized equipment that cannot meet heat exchange requirements during full-load operation.
- Improper flow channel matching: The medium flow velocity does not match the equipment flow channel, preventing the fluid from forming effective turbulence and significantly reducing heat exchange efficiency.
- Scaling and clogging issues: The medium is prone to scaling, but anti-scaling structures were not selected. Long-term operation leads to scaling on the plates and tube bundles, hindering heat transfer.
- Installation and commissioning errors: Inverted inlet and outlet pipe connections or tilted equipment installation result in uneven fluid distribution and reduced heat exchange utilization.
III. Material Selection Q&A (Key to Corrosion Resistance and Service Life)
What are the commonly used materials and suitable media scenarios for imported heat exchangers?
Our free service hotline:400-1234-567
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- 304 Stainless Steel: A general-purpose basic material, resistant to normal water quality and mild acids and alkalis, suitable for HVAC, general water treatment, and clean water heat exchange scenarios. High cost-performance ratio, the first choice for regular export orders.
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- 316L Stainless Steel: Better corrosion resistance than 304, resistant to chloride ions and mild acid and alkali corrosion, suitable for seawater, food and beverage, pharmaceutical, and chemical lightly corrosive media scenarios.
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- Duplex Steel: High strength and high corrosion resistance, suitable for high chloride ion, high salt, and moderately corrosive media, often used in marine engineering and chemical wastewater projects.
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