Why and How Diesel Particulate Filters are Cleaned

As is well known, the principle of operation for diesel engines is significantly different from that of gasoline engines. This, in particular, leads to the emission of a highly harmful carcinogen in the exhaust gases of diesel vehicles: soot, which consists of incompletely combusted carbon atoms. In principle, soot is also combustible, but the temperatures from burning diesel fuel are often insufficient to burn it off. Therefore, to comply with emissions standards, the exhaust system of modern vehicles includes a special component: the diesel particulate filter. This filter not only traps soot but also burns it off periodically.
This process is called regeneration and occurs in two main ways:
1. Heating the exhaust gases to 600-800°C.
2. Combustion of soot at normal exhaust gas temperature using a special liquid.
Regeneration is the standard cleaning system for the diesel particulate filter. Ideally, this system should make the filter's lifespan roughly equal to that of the vehicle itself. However, many conditions must be met for self-cleaning to initiate, and as a result, the filter gradually clogs, stops burning soot, and eventually fails to pass gases through.
Vehicle owners typically resolve problems with the diesel particulate filter by washing it. However, they often use highly toxic fluids that dissolve soot in a very unsafe manner instead of using professional DPF cleaning equipment. The advantages of using caustic chemicals are quite clear: they can be poured directly into the sensor hole, which allows the filter to be cleaned without disassembly.
The disadvantages are equally obvious. The spent chemicals can harm both the environment and the personnel performing the cleaning. Additionally, it is very difficult to determine how well the exhaust system has been cleaned and how much soot remains in the filter. Although the large amount of dirt pouring out of the exhaust can give the impression of a thorough cleaning, the actual result is hidden from view.
Nevertheless, there is a safe, effective, and informative method for cleaning the diesel particulate filter. This is the use of our unique equipment, the MS900 stand. 

MS900 – Specialized Stand for Cleaning Diesel Particulate Filters

To thoroughly clean soot-clogged filters, using "nuclear" chemicals is not necessary. They can be effectively replaced with simple water and air. By combining directional changes of water flow and pneumatic impulses, the stand cleans all types of particulate filters: DPF, FAP, GPF. The MS900 is not only a piece of equipment for cleaning diesel particulate filters; it also allows diagnosing the condition of these parts, providing reports both in printed form and on electronic media, and drying the cleaned filters.
Since the stand has three units, A, B, and C, it is possible to perform multiple actions simultaneously, and a high degree of automation allows one person to operate the stand. Besides working with particulate filters, the MS900 can also be used as equipment for cleaning catalytic converters.
Regarding water, there are some interesting details. First, it is heated to approximately 60°C for washing. Second, it is not running water but is drawn from an internal 250-liter tank and continuously undergoes cyclic three-stage purification: through coarse, medium, and fine filters. The first filter is installed at the tank inlet, the medium filter is a hydrocyclone designed for about 50 DPFs, and finally, the fine stage is implemented using three BB20 polypropylene filters, which are typically replaced after cleaning three particulate filters.
This allows for economical use of water resources and proper and safe disposal of carcinogenic substances removed from the diesel particulate filter. Another feature of our diesel particulate filter cleaning equipment is the software that optimizes the process and makes it independent of the human factor. Two working units of the MS900, modules A and B, can be programmed. In the settings menu of these modules, you can adjust the washing and drying times, the temperature of the water for washing and the air for drying, control the intervals of pneumatic impulses, and many other parameters. All the capabilities of the stand are described in the user manual provided to the customer upon purchase.
However, the main value of the MS900 stand is the quality with which it cleans diesel particulate filters. After the complete cleaning procedure, the cleaned filter becomes practically identical to a new one: both in terms of its ability to pass exhaust gases and capture soot particles, as well as in its residual lifespan.

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