Did your high-power thermal oil furnace go wrong during use? Are you still annoyed by failure to work out a heat conduction oil solution? Amer, with 20-year experience in serving boiler manufacturers, welcomes you to consult any problems difficult to solve of heat conduction oil! Mr. Lin, senior engineer of heat conduction oil from Amer Group, will share with you the application case of heat conduction oil in fine chemistry industry.
I. Briefly Introduce the Use at the Client Site:
Oil-using equipment: 80W kcal gas thermal oil furnace
Oil-using type: Amer DR320K+Amer HT340
Dosage of heat conduction oil: 15t
Site conditions: Customers are mainly engaged in the production of LED packaging glue and used the mold temperature controller for heating before, and our HT340 mold temperature controller oil. But now all the mold temperature controllers have been replaced with an 80W kcal gas thermal oil furnace due to capacity expansion. While the old oil is continued, add 70 barrels of our DR320K heat conduction oil. After it's used for 4 months, the temperature never goes up and only rises slowly, and the smell is great. Many complaints have been received from the surrounding factories. Lots of heat conduction oil is also ejected from the exhaust port of expansion tank, which directly affects the normal operation of the customers' factory.
The main thermal equipment at the client site is chemical reaction still, 8 enamel stills, and 10 stainless steel stills (the temperature of the enamel still cannot exceed 150 ℃, and the stainless steel still can withstand high temperature). The heated reaction still needs to be cooled down as soon as possible due to process requirements, so the heat conduction oil is divided into cold oil system and hot oil system.
When the reaction still needs to be heated up, close the cold oil valve. When the reaction still needs to be cooled, close the hot oil valve. This creates the exchange of cold oil and hot oil in the reaction still. The result of prolonged use is that the cold oil and the hot oil are continuously exchanged in the reaction still.
II. Reasons found after Testing:
The tests revealed: Hot oil moisture content is 300ppm and cold oil moisture content is 3,000ppm
Moisture source: The boiler tube is subject to water pressure test after being installed, resulting in lots of moisture in the system. After the hot oil is heated, the moisture can be discharged through the exhaust system, while the cold oil needs no heating, so the moisture can't be discharged. The cold oil and hot oil are replaced in the reaction still, so as long as the customer uses the cold oil, the system instability, oil injection and other incidents will occur.
As the moisture of the cold oil is often replaced into the hot oil, the boiler pressure is often unstable, leading to failure to close the auxiliary exhaust valve of the expansion tank.
If the auxiliary exhaust valve can't be closed, the temperature in the expansion tank will be very high, and then lots of high-temperature gas will be discharged. That's why customers complain about the great smell of heat conduction oil.
III. Understand the Hazards of Moisture in Heat Conduction Oil
If there is moisture in heat conduction oil or the light components are out of limits, the moisture will vaporize, resulting in rapid volume expansion during the heating operation of the system, increased system pressure fluctuation and "cavitation" phenomenon in the circulating pump. In the meantime, the increase in the air displacement of the elevated tank may even flush out the heat conduction oil from the exhaust pipe, causing an accident and making the heat conduction oil system fail to work.
The moisture not only affects the safe operation of the heating system, but also relates to the aging and deterioration of the heat conduction oil. For example, moisture exists in a gaseous form in the heating system, which increases the surface area of the heat conduction oil. The oxygen molecules in the water provide conditions for the oxidation of the heat conduction oil, which accelerates the aging of the heat conduction oil and shortens the service life of the heat conduction oil.
IV. Final heat conduction oil solution
The customer's enamel kettle and some parts in the cold oil system cannot withstand high temperature, so it is not possible to simply exchange and circulate the cold oil and hot oil to increase the temperature and drain away water.
Scheme: all the heat conduction oil in the cold oil system and the enamel reactor is discharged, and the discharged heat conduction oil is put into the customer's production reaction still for vacuum dehydration treatment, and the dehydrated heat conduction oil is added back to the cold oil system.
(vacuum degree: -0.09Mpa temperature: 120℃)
After the moisture is discharged from the system, the temperature slowly rises to 260°C, and the auxiliary exhaust valve of the expansion tank is closed after the temperature is attained. The temperature of the expansion tank drops below 70°C. Now the customer's heat conduction oil has achieved normal use, the pressure is stable, the temperature can meet the process requirements, and no odor is discharged.
Moisture discharged from heat conduction oil in vacuum reaction still