For heat transfer oil furnaces, what kind of oil should be used as the heat transfer oil?

Based on their composition and manufacturing processes, heat transfer oils can be divided into synthetic heat transfer oils and mineral heat transfer oils. 1. Synthetic heat transfer oils 1) Alkylbenzene-type (benzene-ring type) heat transfer oils. These types of heat transfer oils are compounds in which a benzene ring is attached to alkane side chains; they are products resulting from the combination of short-chain alkyl groups (including methyl, ethyl, and isopropyl groups) with the benzene ring. Its boiling point is between 170–180°C, and its freezing point is below -80°C; therefore, it can be used as an antifreeze. The advantage of such products is that they do not tend to form precipitates within their applicable range, with compounds containing isopropyl side chains being particularly suitable. 2) Alkylnaphthalene-type heat transfer oils are compounds in which alkyl side chains are attached to benzene rings. The side chains attached to it are generally methyl, dimethyl, isopropyl, etc.; the type and number of these attached side chains determine the properties of the compound. Alkylnaphthalene with a methyl group attached to the side chain, used in gas-phase heating systems operating in the range of 240–280°C. 3) Alkylbiphenyl-type heat transfer oils are compounds in which alkyl side chains are attached to the biphenyl ring. It is composed of short-chain alkyl groups (ethyl, isopropyl) combined with biphenyl rings, and the type and quantity of alkyl groups determine its properties. The greater the number of alkyl groups, the poorer its thermal stability. Among such products, heat transfer oils synthesized from the meta and para isomers of isopropyl along with biphenyl offer the best quality; they have a boiling point of >330°C and good thermal stability, making them ideal for use in the 300–340°C range. 4) Biphenyl and biphenyl ether low-melting mixture-type heat transfer oil: This type of heat transfer oil is a low-melting mixture of biphenyl and biphenyl ether, composed of 26.5% biphenyl and 73.5% biphenyl ether. Its melting point is 12°C. The first synthetic aromatic heat transfer oil used in the world was Dowtherm, which is characterized by good thermal stability and a high operating temperature of 400°C. Such products have the best heat resistance among organic heat carriers because there are no alkyl side chains attached to the benzene ring. This low-freezing mixture with a freezing point of 12.3°C is economical to use at room temperature, as its boiling temperature lies within the range of 256–258°C. This is because the melting points of both substances are high (biphenyl is

This post was last edited by Yafeiling on 2018-1-24 at 10:49. What are the things to pay attention to when changing oil in an electric heating heat transfer oil furnace? 　　(1) The entire oil circulation system of the electric heating heat transfer oil furnace should be designed to ensure smooth operation. Minimize elbows and valves. Choose a high-efficiency circulation pump. Clean the filter in a timely manner, and it is essential to ensure that the flow rate of the heat transfer oil at high temperatures is not less than 2 m/s. 　　(2) For electric heat transfer oil furnaces, select the heating furnace appropriately (generally choose type III at 1.5 times the nominal capacity) to avoid overloading and the inefficiency that results from an excessively large scale. Whether the heating capacity of the heating furnace is selected appropriately not only affects its safety and lifespan, but also influences the service life of the heat transfer oil and the production costs. 　　(3) For electric heat transfer oil furnaces, transfer oil with good thermal stability and oxidation resistance, as well as strong anti-coking properties, should be used. When selecting heat transfer oil for a heat transfer oil furnace, be careful not to choose oil that has an odor or a dark color. The service life of heat transfer oil is evaluated using four parameters: residual carbon, acid value, flash point, and viscosity (Table 1). Conduct oil quality tests every six months to ensure proper control of the quality of the heat transfer oil in use. Upon detecting the problem, replace the heat transfer oil promptly, and identify the reasons for its premature deterioration as well as preventive measures. At the same time, it is essential to strictly avoid mixing different types of heat transfer oil. I would like to recommend Zhengzhou Yafiling Electric Boiler Manufacturer: http://www.yflgl.com/【15346582356】. The company specializes in electric steam boilers, electromagnetic heating boilers, electric heat transfer oil furnaces, and other similar products. The prices of Yafiling’s electric boilers are 15% lower than those of competitors, and their electric steam boilers have won the favor of 5,000 customers! Feel free to contact them for more information.

Choose the type of heat transfer oil based on the outlet temperature of your equipment; according to market feedback, mineral-based heat transfer oils have a service life of at most 3–5 years. There’s not much to say about this model; it comes in 300 and 320 versions. The optimal operating temperature is below 300, with the best temperature for use being below 260. The synthetic types include hydrogenated types, aromatic types, diphenylbenzene, dibenzyltoluene, and hydrogenated terphenyls; these are the most commonly used synthetic thermal conductive oils. The operating temperature can reach 300 degrees. Among them, dibenzyl and hydrogenated terphenyl can reach 350 degrees. It’s fine to choose products that meet national standards based on the temperature at which you will use them. It is recommended to choose a rating that is 30 degrees higher than your highest temperature. For example, temperatures between 280 and 300 degrees can be chosen; oils such as hydrocarbons, hydrogenated types, and diphenyl ether-based heat transfer oils can all meet the requirements. The above is typed manually – no copying allowed! If it is electric heating, then it depends on the specific circumstances. Feel free to call for inquiries