What are the types of heat transfer fluid and protection methods?

Heat transfer oil is the former name of "heat carrier oil" in GB T 4016-1983 "Terminology of Petroleum Products", and the English name is heat transfer oil, which is used to indirectly transfer heat A special oil with good thermal stability. Because of its uniform heating, accurate temperature control, high temperature under low vapor pressure, good heat transfer effect, energy saving, convenient transportation and operation, etc., it has been widely used in various occasions in recent years, and its use and dosage are increasing. The main characteristics are 1

In the allowable temperature range, the thermal stability is good, the coking is less, and the service life is long. 2.Within the allowable temperature range, the thermal conductivity, fluidity and pumpability performance are good.

3.Low toxicity, tasteless, does not corrode equipment, and has little impact on the environment. 4.

The freezing point is lower, the boiling point is higher, and the content of low-boiling point components is less. Within the allowable temperature range, the vapor pressure is not high, and the evaporation loss is small. 5.

When the temperature is higher than 70, it will be strongly oxidized in contact with the air, and its heated working system needs to be sealed, and only allow it to contact with the air at a temperature below 70. 6.After heating, the volume expands significantly, and the expansion rate is much greater than that of water.

The temperature rise is 100, and the volume expansion rate can reach 8% 10%. 7.Cracking or condensation occurs when overheated, and coking or carbon deposits occur in vessels and pipes.

8.When mixed with water or low-boiling components, the vapor pressure increases significantly when heated. 9.

The flash point, ignition point and spontaneous ignition point are all high, and it will not catch fire and burn at the allowable temperature and in a closed state. 10.According to the area where the user lives and the working environment of the equipment, it is recommended to choose a suitable heat transfer oil with low temperature performance.

Depending on the composition and manufacturing process, heat transfer fluids can be divided into synthetic heat transfer fluids and mineral heat transfer fluids. Before selecting a heat transfer oil, the appropriate heating process should be determined first, and it is best to entrust a professional department to do the system design. If the system has coked and needs to be selected again, the cause of coking should be carefully identified, the problems in system design, component setting and operation management should be corrected, and the system should be carefully cleaned.

Protection of heat transfer oil in the use process 1, avoid oxidation of heat transfer oil Because the heat transfer oil is prone to oxidation reaction in the case of high temperature operation in the heat carrier, resulting in the deterioration and deterioration of the heat transfer oil, so the high temperature expansion tank usually is equipped with nitrogen for nitrogen protection to ensure the closure of the heat carrier system, avoid contact between heat transfer oil and air, and prolong the service life of heat transfer oil. 2. Avoid the coking of the heat transfer oil When the operating temperature of the heat transfer oil exceeds the maximum use temperature, there will be coking on the oil guide pipe wall, with the thickening of the coking layer, the high temperature of the oil guide pipe wall promotes adhesion and coking, and the temperature of the thickening pipe wall is further improved, and with the continuous thickening of the pipe wall, the heat transfer performance deteriorates, and the pipe burst accident may occur at any time. Therefore, the temperature of the heat transfer oil at the outlet of the heat carrier should not exceed the maximum use temperature, and the maximum film temperature of the heat carrier should be less than the allowable oil film temperature.

Alkylbenzene type (benzene ring type) heat transfer oil is a compound with a benzene ring attached to the branched chain of paraffin, which belongs to the product of the combination of short branched alkane groups (including methyl, ethyl, and isopropyl) and benzene rings. Its boiling point is 170 180, the freezing point is below -80, so it can be used as antifreeze, this kind of product is characterized by not easy to precipitate in the scope of application, isopropyl chain compounds are particularly good. Alkyl naphthalene type heat transfer oil: The structure of this type of heat transfer oil is a compound connected to the alkane branch chain on the benzene ring.

The side chains to which it is attached generally include methyl, dimethyl, isopropyl, etc., and the type and quantity of the additional side chains determine the properties of the compound. Alkyl naphthalene with side chain single methyl link for use in gas phase heating systems in the 240 280 range.

Oleochemical industry: fatty acid distillation, oil decomposition, distillation, concentration, nitrification. Chemical Fiber Industry:

Fine chemicals: synthesis of pharmaceuticals, pesticide intermediates, antioxidants, surfactants, spices, etc. <

1. Oleochemical industry: fatty acid distillation, oil decomposition, distillation, concentration, nitrification.

3. Gongsong Fu Hunger Industry: Application Industry and Equipment Rubber and Plastic Industry, Hot Pressing, Calendering, Extrusion, Vulcanization, Artificial Leather Processing, Film Processing.

4. Fine chemicals: medicine, pesticides, antioxidants, surfactants, spices, etc.

5. Electrical processing: wire and cable manufacturing.

6. Energy industry: waste heat, solar energy utilization, reactor heating.

7. Food industry: grain drying, food baking.

8. Air conditioning industry: household heating chemical industry.

9. Paper industry: hot melt machine, corrugated plate processing machine, dryer.

10. Wood processing: composite panel pressing, dryer.

There are six kinds of heat transfer oils, namely alkylbenzene type (benzene ring type) heat transfer oil, which is the product of the combination of short branched alkane groups (including methyl, ethyl, and isopropyl) and benzene rings; Alkyl naphthalene type and biblic heat transfer oil; and diphenyl ether low melting point mixed heat transfer fluid; Alkyl diphenyl ether type heat transfer fluid; Mineral heat transfer oil alkylbenzene (benzene ring type) heat transfer oil: It is the product of the combination of short branched alkane groups (including methyl, ethyl, and isopropyl) and benzene ring. Its boiling point is 170-180, and the freezing point is below -80, which can be used as an antifreeze.

Alkyl naphthalene type heat transfer fluid: the type and number of side chains attached to it determine the performance of this compound. Alkyl naphthalene with side chain linked to methyl group is used in 240-280 gas phase heating system biphenyl type heat transfer fluid

It is composed of short-chain alkyl groups (ethyl, isopropyl) combined with biphenyl rings, and the type and number of alkyl groups determine their properties. The more alkyl groups, the worse their thermal stability. and diphenyl ether low melting point mixture heat transfer fluids:

Since the benzene ring is not attached to the alkane side chain, this type of product has the best heat resistance among organic heat carriers. This mixture with a low freezing point is economical to use at room temperature and boiling temperature range of 256-258. Alkyl diphenyl ether type heat transfer fluid;

This hybrid heat transfer oil has low kinematic viscosity and good fluidity at low temperature, which is suitable for use in the cold areas of northern China. It is recommended that the maximum temperature should not exceed 330 °C and the freezing point should be -54 Virtual Type I Mineral Heat Transfer Oil: The product of a certain distillation range in the process of petroleum refining, the main components are different from the base oil.

It is generally a mixture of long-chain alkanes and naphthenes.

There are three main types of heat transfer fluids:

1.Mineral oil heat transfer oil: Extracted from petroleum, ** low, but cautious easy to oxidize, flammable, volatile, short service life. Sleepy.

2.Synthetic heat transfer oil: It is chemically synthesized, with good stability and long service life, but ** high.

3.Aromatic Heat Transfer Oil: Made of aromatic hydrocarbon compounds, it has high thermal and chemical stability, but ** is higher.

You can learn about the excellent heat transfer oil with medium energy temperature control, and the quality is guaranteed!

Generally speaking, heat transfer fluids have a certain oxidation function, and the most basic heat transfer efficiency is outstanding, which can heat up quickly and cool down quickly. In the case of normal pressure, we can obtain a relatively high temperature, which can continuously improve the reliability of the entire operating system and the reliability of the equipment, and can meet the heating or cooling practices of different manufacturers in industrial production.

Why use heat transfer fluid? In our work, there will definitely be a heating or cooling system operation, but such an operation is very troublesome, which will undoubtedly increase the work procedure and reduce the work efficiency, so what kind of work should be done at this time? In fact, it is also very simple, the rational use of heat transfer oil, basically this part of the problem no longer exists.

In fact, although the use of heat transfer oil is good, there may also be certain drawbacks, that is, the use of heat transfer oil is more dangerous. If there is a leakage of heat transfer oil, it is easy to cause fire, and if there is a problem with the quality of the heat transfer oil, it may be that the machine is also prone to the first situation, which is also very serious.

In the petroleum industry, it is mainly used for the heating of natural gas and the processing, storage and transportation of mineral oil. Refineries use heat transfer oil to preheat cold materials and have been successfully used to heat solvent and extractant evaporation units in lubricant manufacturing.

In the chemical industry, it is mainly used for distillation, evaporation, polymerization, condensation, demulsification, lipidization, drying, melting, dehydrogenation, forced heat preservation and heating of synthetic devices such as pesticides, intermediates, antioxidants, surfactants, spices, etc.

In the oil industry, it is mainly used for the heating of oil decomposition, fatty acid distillation, lipidization, nitrification, hydrogenation reaction, concentration, vacuum deodorization and other devices.

In the food industry, it is mainly used for the heating of bread baking devices, biscuit food baking devices, candy production devices, grain drying devices, edible oil pressing and refining devices, cooking pots, autoclaves, and conveyor belt dryers.

In the textile printing and dyeing industry, it is mainly used for drying and setting packaging, hot melt dyeing packaging, dyeing and printing equipment, dryers, dryers, calenders, flattening machines, washing machines, cloth rolling machines, ironing machines, hot air stenters, etc.

Ad. What kind of hazards and precautions will occur during the use of heat transfer fluid.

Clark lubricants.

Subscribe. In today's industrial production, heat transfer oil is widely used, designed in many industries, such as ship transportation, road construction, chemical industry, etc., as a heat transfer medium, heat transfer oil, good stability, strong oxidation resistance, convenient transportation, cost-effective. So everyone will choose it, but will there be any danger in the use of heat transfer oil, and how to pay attention to protection?

First, mainly in the heating system, when part of it is overheated, there are serious consequences - under the action of pyrolysis reaction, oligomers begin to appear in large quantities, volatile and also have a low flash point, it eventually generates polymers, which are difficult to melt and dissolve, which will not only affect the fluidity of the oil, but also reduce the thermal conductivity. In the long run, this can cause many hazards, such as corrosion, blockage, explosion, and leakage of the pipeline.

2. How to avoid it?

1. Measures should be taken to reduce the oxidation rate of heat transfer oil. In the process of operation of the heat transfer oil, its carrier - the expansion tank is treated, such as filling nitrogen to protect or seal it, so that it can reduce the amount of contact with oxygen in the air, thereby slowing down the generation of oxidation reaction, and prolonging the working life of the heat transfer oil.

2. It is necessary to reduce the occurrence of coking on the pipe wall. Care should be taken to avoid the occurrence of excessive temperature during use, especially not to exceed the maximum limit temperature of heat transfer oil, so as to avoid danger.

3. It is necessary to avoid the occurrence of the leakage point phenomenon of the heat conduction tubing wall. Regularly check the leakage point to strengthen on-site monitoring, ensure that the heat carrier system is intact, regularly check the corrosion and leakage of the equipment, and repair the leakage in time. Therefore, the heat carrier system should be reasonably designed, the wall thickness and compressive strength of the equipment should be regularly tested during use, and pressure gauges, safety valves and venting pipes should be installed on the equipment and pipelines.

4. It is necessary to avoid the occurrence of rapid heating. If the heat transfer oil heats up too quickly, then there may be moisture mixed in it, and it may suddenly expand too quickly, so that the sudden increase in internal pressure may lead to the occurrence of phenomena such as pipe bursts. Therefore, we must remember to heat it slowly, so that the moisture in the heat transfer oil will gradually vaporize and be discharged, and the danger can be effectively avoided.

5. The quality of heat transfer oil should be tested in time. Any substance will have a certain retention period, and heat transfer fluids are no exception. Therefore, in order to ensure that the quality of heat transfer oil does not change, we should regularly test its acid number, melting point and other quality values, so as to test on time and update in time to ensure the stability of heat transfer oil quality and related properties.

In this way, we can ensure that it has a reliable quality assurance during use.

Some of the hazards and measures that occur in the process of leading to the use of oil should be protected during transportation, and special materials should be used for one year.