Hering’s winning solution

Hering’s Adsorbent Mineral Polishing System improves color, odor and properties of the transformer oil without use of bleaching clay. Hering Phonix Green is known for its performance and environment compatibility and for highest surface area of lube oil polishing process.

Hering Phonix Green is a naturally occurring mineral devoid of the environmental hassles posed by chemically activated clays. It works efficiently on oils pretreated by vacuum distillation or wipe film evaporation.

The clay by itself can be reactivated and reused for 500 times in Hering AMPS equipment and gives high quality group I and group II base oils. The polishing process removes unstable sulphurized and oxidised compounds, fetching maximum quality. It is also devoid of chemicals, and chemically activated substances like conventional bleaching clays.

Hering’s AMPS avoids high capital expenses and environmental problems of traditional clay based treatments. The AMPS system works on oil processing capacities ranging from 50 liters per hour to 27,000 liters per hour. It works in conjunction with Hering Waste Oil Recycling Plant and Add-on in existing plants.

The Adsorbent Mineral Polishing System is an effective and economic alternative for hydrogen treatment plants. It is applicable in final polishing stages of all types of oil refineries and combats undesirable polar components in the oil. It decreases sulfur content from 2000 PPM to less than 300 PPM in single pass without harming the viscosity index of the oil.

Besides low operating costs, Hering’s Reactivation Clay Polishing System is compatible with flexible operating modes such as parallel mode operation which single pass and fast processing in less time. It also is available in a modular system in flexible layouts which minimize shipping costs. It works in global voltages and frequencies and minimizes oil loss.

Hering’s century old reputation and German precision is enhanced by quality assurance and awareness amongst the entire team. Owing to this, Hering is lauded with numerous quality certificates across the globe.

Points to note while choosing adsorbents

While choosing adsorbents, one should focus on aspects including reduction of oil reclamation costs after using adsorbent, expenses in adsorbent disposal, number of cycles depending on contamination, physical process and selection of processing conditions. The amount of oil processed would decrease after each cycle of adsorbent usage.

Commonly used adsorbents in treating transformer oil

Adsorption method uses specialized adsorbents like bleaching clays, silica gel, aluminum oxide, bauxite and natural zeolites which trap contaminants. Also known as Fuller’s Earth, bleaching clay has a tremendous impact on the final product. The silica content in the treated transformer oil is more than 32.5 per cent and the moisture content is less than 10 per cent. The acid number is reduced by 45 per cent while the grit grains size is within 3 to 7 mm.

Kaolin clay enhances the physical and electrical properties of aged transformer oils and removes unwanted gasses in oil which is used for more than 10 years.

Silica gel which is used as breather is known for its moisture adsorption attributes. Silica gel which is available in various grades and mesh sizes is chosen and used as per requirements. The gel turns from blue to pink while absorbing moisture.

Oxidation, which is part of the degradation process, forms acid and polar compounds which form sludges. The sludge increases heat transfer in the apparatus which in turn increases the operating temperature in the system and promotes degradation of the oil.

Activated bauxite which is low cost adsorbent restores the transformer oil from such degradation, but produces large amounts of wastes. However, micro particles of carbonated amorphous calcium phosphate CACP, bound by biopolymers of chitosan polysaccharide reclaims the oil more effectively than bauxite.

Activated bentonite is efficient in removing aminophenazone, a harmful additive, from the transformer oil. Aminophenazone affects the insulation properties of the oil and results in substation accidents.