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JIANGSU ZHONGNENG CHEMICAL TECHNOLOGY CO., LTD, located in Chemical Industry Park of Jiangsu Province, is one of the three global top manufacturers of heat transfer fluids and biphenyl products. Zhongneng specializes in the development, production and sales of SCHULTZ® fluid series and DYNOVA® functional chemical series with over 10,000 tons annual capacity per each. As a global chemical enterprise, Zhongneng has established the affiliate in North America -- Schultz Chemical (Canada), which promotes products and expands international market. Up to now, Zhongneng has sales network in 8 countries and regions. Based on its growing creativity, flexible customization and gradually improved delivery performance, Zhongneng gains the trust and collaboration from customers all over the world.

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SCHULTZ® S740 is a gas/liquid phase high temperature synthetic heat transfer fluid with outstanding thermal stability, which is operated in temperature range of 12℃～400℃. SCHULTZ® S740 has the highest operation temperature among synthetic heat transfer fluids due to its incomparable and irreplaceable high temperature performances, which is widely used in CSP industry. SCHULTZ® S740 is the same product as Dowtherm A and Therminol VP-1, which can be mixed together in any ratio.

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Heat Transfer Oil

There are two types of heat transfer fluid (HTF) systems – opened and closed systems. The opened system is that the expansion tank and exhaust pipes are connected directly to the atmosphere; while for the closed system the expansion tank is shielded from the atmosphere. The features and principles of two systems are presented below:

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Heat Transfer Oil-dynovacn

Heat transfer fluid is the well-performed heat transfer medium playing important role in many industrial manufactures. However, many users are lack of specialized knowledge and operate system improperly, which speeds up fluid deterioration and shortens fluid service life, increasing production costs. Periodic testing of in-use fluid is the crucial measure to keep system in good condition.

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Common Misconception of Heat Transfer Fluid Flash Point

Common Misconception of Flash Point

In the process of technical support and after-sale service, technical engineers of Schultz ® heat transfer fluids find that many fluid users have the common misconception of fluid flash point. A lot of users think the higher flash point means higher temperature resistance. Instead of paying attention to fluid thermal stability, oxidation stability and thermal conductivity, many users only value the fluid flash point and make it to be the leading indicator for choosing the fluid.

Tips:

Thermal stability is the most important indicator of heat transfer fluid.

What’s the Flash Point?

Flash point is a safety indicator of heat transfer fluid during usage and storage. There are different requirements of flash point of different fluids based on the various usage modes. Unsafe factors occur when fluid flash point doesn’t meet the requirements. According to the Chinese heat transfer fluid regulation of GB23971-2009, the closed-cup flash point should not be below 100℃. But this regulation only sets the standard of open-cup flash point of L-QB fluids used in open-type system and has no standard of open-cup flash point in closed-type system.

Flash points of synthetic heat transfer fluids sold on market are generally below 200℃. According to statistics, flash points of heat transfer fluids in common use in China are between 160～200℃.

Operation temperature of heat transfer fluid is general above 250℃. The maximum operating temperature reaches 350℃ in fluid liquid phase and 400℃ in gas phase. Although system temperature is higher than fluid flash point, fluid is operated in a closed circulation system with no burning conditions (fuel, temperature and oxygen) and cannot be on fire, which has no influence on fluid furnace and system security. However, once system leaks, it’s easy to cause fire or explosion when high temperature fluid is exposed to flame or electrostatic spark even if the fluid flash point is very high.

Flash point is not the leading indicator to measure fluid safety. Higher flash point doesn’t mean higher operation temperature. According to the Chinese heat transfer fluid regulations, heat transfer fluid does not belong to the flammable fluid category. The regulations demand that closed-cup flash point of heat transfer fluid should not be below 100℃.

Tips from Schultz Heat Transfer Fluid Experts

The leading indicator of fluid quality is thermal stability. Fluid thermal stability is the assessment index to evaluate fluid performance and safety. When choosing fluid, users should pay attention to fluid thermal stability and focus on thermal stability test conducted by national authorities. Please be out of the misunderstanding of fluid flash point.

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Heat transfer fluids play a crucial role in making chemical fiber and polyester products. Processes such as polymerization, melting, extension and drying during synthesizing PET, PU, PA6 and PA all require high temperatures. Except for providing stable and accurate heat, fluids used in these processes shall also meet the strict safety demands.

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