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Diesel Particulate Filter (DPF)

The Diesel Particulate Filter (DPF) was initially introduced in the 1970s due to concerns about the inhalation effects of particulate matter. Its application for off-road vehicles began in the 1980s and expanded to heavy-duty diesel vehicles since 2006. While there is no mandatory requirement for installing particulate filters on diesel vehicles, tightening regulations have positioned DPFs as the most effective tool for achieving Euro 6 emissions standards for diesel vehicles.
فیلتر جاذب ذرات معلق (DPF) از دسته محصولات سیستم پس پالایش دیزل شرکت آداک
DPFs prevent the release of particulate matter into the atmosphere by channeling the flow containing particles through porous walls. The majority of solid particles collected in the filter are combustible. Under suitable conditions (temperature and oxidizer), they undergo combustion (regeneration). The temperature required for soot combustion by oxygen is approximately 550-600 degrees Celsius, a temperature seldom reached during normal diesel vehicle operation. Consequently, achieving complete regeneration within the filter under typical conditions is impractical, leading to eventual clogging of the filter based on the vehicle’s emission levels and causing substantial engine damage. The primary challenge associated with particulate filters pertains to the regeneration process. Depending on the regeneration type, it is broadly classified into active and passive regenerations.
فیلتر جاذب ذرات معلق (DPF) از دسته محصولات سیستم پس پالایش دیزل شرکت آداک
Active regeneration involves supplying the necessary temperature for material combustion from an external source, while passive regeneration allows combustion at a lower temperature by reducing activation energy or utilizing oxidizers other than oxygen, facilitated by a catalyst. The mechanism of a particulate filter comprises two components: filtration and regeneration.

Passive Regeneration

In this approach, the temperature necessary for the combustion of trapped particles within the filter is lowered to the operational temperature of the engine. Key methods to achieve this include:
  • Metal-based Catalyst Additives to Fuel
  • Coating the Filter with Precious Metals (CDPF - Coated Diesel Particulate Filter)
  • Continuous Regeneration Trap (CRT) Filters
Continuous Regeneration Trap (CDPF-CRT) filters utilize nitrogen dioxide (NO2) instead of oxygen to combust the trapped particulates. Nitrogen dioxide, unlike oxygen, can oxidize the particulates at considerably lower temperatures. Naturally, the level of NO2 in the exhaust gases is low. The DOC core in CRT filters and the catalytic coating in CDPF filters, besides reducing hydrocarbons (HC) and carbon monoxide (CO), convert NO, which is present in high percentages in the exhaust gases, into NO2. This enables the regeneration of the DPF core under the temperature conditions of the exhaust gases.

Active Regeneration

In the active regeneration process, the required energy to combust the trapped materials in the filter is generated using an external agent. The primary methods of active regeneration include:

  • Fuel injection into the filter chamber.
  • Installing a secondary combustion chamber upstream of the filter.
  • Electric heater upstream of the filter.
  • Incorporating radiant elements inside the filter.
  • Using a localized air-fuel ratio control system to increase the exhaust gas temperature.

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Adak Sanat Polymer is the only Iranian team that has competed with a big company like VOLVO in the manufacture and production of catalysts and has won many honors for localization and reducing the need and dependence on foreign countries. Obtaining the SAPCO method approval certificate, ISO 9001 and obtaining official representation from KAILONG company in Iran are some of the achievements of the organization.

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Adak Sanat Polymer is the only Iranian team that has competed with a big company like VOLVO in the manufacture and production of catalysts and has won many honors for localization and reducing the need and dependence on foreign countries. Obtaining the SAPCO method approval certificate, ISO 9001 and obtaining official representation from KAILONG company in Iran are some of the achievements of the organization.

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لوگوی آداک صنعت پلیمر
Adak Sanat Polymer Company was established in 2015. After three years of study, research, and achieving the technology to produce catalytic converter heat shield, it obtained the knowledge-based certificate and ranked first in the industry.

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All rights of this website belong to Adak Sanat Polymer.