Modular SMF® System

SMF® technology has been developed specifically for applications in the medium to high power range. As a rule, the systems replace the original silencer, and they can be customised as required to match specific machines and stationary applications. The modular SMF® systems require no extra regeneration aids, additives or intervention in the engine management system. The HJS Service Unit constantly displays the system’s instantaneous operating state and indicates when the filter is in need of cleaning.

Catalytic coating

For low-temperature applications, the Sintered Metal Filter can be given a special coating in order to promote the regeneration process (CSMF = Coated Sintered Metal Filter).

Application examples for SMF® systems:

Construction machinery, construction vehicles and construction equipment, such as industrial forklift trucks, wheel loaders, backhoe loaders, track loaders, special vehicles, power generating sets and district heating plants

Functional description

The hot exhaust-gases from the engine – which contain soot particles – are fed into the housing of the SMF®. The gaseous  components flow through the microscopic pores of the filter pockets; the soot particles, including the fine particulate matter, are trapped on the surface and deposited on the individual filter
pockets.
The CRT* (Continuous Regeneration Technology) effect is used to break down the soot that collects in the SMF®. The HJS system combines a highly efficient, upstream diesel oxidation catalyst (DOC) with an SMF®. Optimised tuning of the system results in the filter being continuously and effectively freed from the deposited soot.

Application examples for SMF® systems:

Construction machinery, construction vehicles and construction equipment, such as industrial forklift trucks, wheel loaders, backhoe loaders, track loaders, special vehicles, power generating sets and district heating plants

Benefits

✔ No need for time-consuming and costly replacement of mobile machinery and stationary applications
✔ Reduction of soot particles and fine particulate matter by more than 99%
✔ Catalytic coating provides extended temperature window
✔ Flexible adaptation to different machines and engine power outputs

Technical data and requirements

✔ Max. safe temperature operation for SMF®*: 650°C exhaust-gas temperature
✔ Max. safe temperature operation for CSMF**: 450°C (max. 3% of operating time 450°C < T < 500°C)
✔ Filter material: high-temperature-resistant chrome-nickel steel

Application and operating conditions

The following application and operating conditions must be complied with in order to ensure the modular SMF®/CSMF systems from HJS function optimally:

  • Engine fulfils Stage II, Stage IIIA or B in Europe, Tiers 2, 3 and 4 in the USA
  • Fuels used comply with DIN EN 590 (max. 50 ppm sulphur), DIN 51628 or DIN 14214 with a maximum phosphor concentration of 2 ppm and a maximum alkali concentration of 1 ppm
  • Low-ash engine oils
  • Exhaust-gas temperatures between 250°C and 450°C for > 35% of operating time for regeneration
  • Strain-free, vibration-isolated installation of the systems and secure, gas-tight connection to the existing exhaust system
  • Systems never mounted on the engine-gearbox unit

Perfect connection of the system pipework ensures low exhaust backpressure. HJS offers insulating components for all its systems to reduce their surface temperature.

The systems must only ever be operated in conjunction with the HJS Service Unit and HJS insulation (included in the scope of delivery).

In order to ensure the systems operate as intended, HJS and its authorised partners offer a temperature-measurement service and one-on-one application consulting.

Dimensioning the filter

HJS offers modular SMF®/CSMF systems with filter surface areas ranging from 1.2 m2 to 10.2 m2. To help you choose the right size of filter, the diagram below shows the exhaust backpressure generated by each size of filter (not taking the inlet and outlet modules into account).

Example calculation

In the case of a construction machine with a power output of e.g. 250 kW and a maximum permissible exhaust backpressure of 200 mbar (as specified by the engine manufacturer), a filter with a surface area of 5.4 m² can be installed. In this simplified example, it should be noted that the backpressure flow of the inlet
and outlet modules is not taken into account. The modules tend to result in a slightly higher backpressure. Further technical data are required if the filter is to be dimensioned more precisely

Dimensioning the catalytic converter

The vehicle and engine data (plus some other data) are required in order to determine the size of catalytic converter (3-inch or 6- inch cat) required. In order to ensure catalytic converters operate as intended, HJS and its authorised partners offer one-on-one assistance.

Considering the installation space available

After determining the size of the filter and catalytic converter, it’s time to see how much space is available for installing them. As a rule, the filter system replaces the original silencer. Alternatively, the particulate filter system can be installed at a different position in the exhaust system. When selecting the installation position, make sure that there is sufficient clearance between the filter and other components and that the filter can be removed easily for servicing and maintenance work.

The filter unit can be installed horizontally or vertically. The matching inlet and outlet modules must be selected in line with the amount of installation space available in the machine (AXIALAXIAL, AXIAL-RADIAL, RADIAL-AXIAL, RADIAL-RADIAL). To secure the filter, system mounts must be used.

Dimensioning the catalytic converter

The vehicle and engine data (plus some other data) are required in order to determine the size of catalytic converter (3-inch or 6- inch cat) required. In order to ensure catalytic converters operate as intended, HJS and its authorised partners offer one-on-one assistance.

Dimension tables

The dimension tables contain all dimensions of relevance to installation. All dimensions are stated in millimetres (mm). This section describes and illustrates the different versions of filter systems with a surface area of 1.2 m2 to 10.2 m2.

Content of dimension tables

  • Inlet module
  • 3-inch or 6-inch cat module
  • SMF® (uncoated filter) or CSMF (coated filter)
  • Outlet module

Scope of delivery

The item numbers listed describe fully assembled filter units with inlet and outlet module, system clamp, gasket set and HJS Service Unit. In addition, all relevant technical documentations, such as the installation guidelines and maintenance manual, are included in the scope of delivery. The system mounts and insulation set must be ordered separately.

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