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MIRATECH Solutions Guide

MIRATECH is the expert in providing fully integrated, proven exhaust compliance solutions for anyone using industrial engines in a Power Generation, Gas Compression and Mechanical Drives.

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  1. Gas Compression
  2. Power Generation
  3. Rail
  4. NESHAP Regulations
  5. Industrial
  6. Air Compression
  7. Liquids Pumping
  8. Bio-Gas
  9. Greenhouse CO2 Enrichment
  10. Industrial Marine

Engine Type

  1. Bi-Fuel Diesel and Natural Gas
  2. Diesel
  3. Natural Gas Lean Burn
  4. Natural Gas Rich Burn

Noise Control

  1. Yes
  2. No

Engine Size

  1. 20 to 200 hp
  2. 200 to 1350 hp
  3. 1350 to 10,000 hp
  4. 10,000 hp and above

Regulated Pollutants

  1. NOx
  2. NO2
  3. CO
  5. HAP's
  6. Particulate Matter (PM)

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Rich Burn Air MEC-R9

MIRATECH’s MEC-R9 Rich Burn Air/Fuel Ratio Control is a multi-set point controller that uses a heated oxygen sensor mounted in the engine’s exhaust (upstream of the catalyst) to detect drift in the engine’s air/fuel ratio over time.  It provides operators with 9 set points across the engines operating load to ensure compliance in dynamic operating environments and to maximize emission-control efficiency.

To understand the MEC-R9, it is helpful to first consider a single set point controller. With a single set point controller, the same air/fuel set point is used regardless of engine load. This style of controller is sufficient for many applications. However, in some applications the optimum air/fuel value for one operating load may not be the optimum value for a different load.

In areas where emission limits are particularly tight, the MEC-R9 provides a means for entering multiple air/fuel targets to be matched with specific engine loads. The MEC-R9 does this by providing the user with a two dimensional table consisting of three RPM points and three manifold pressure points creating nine possible air/fuel targets.

During operation, the controller determines engine load by monitoring both manifold pressure and engine speed. Using these, the MEC-R9 interpolates an air/fuel set point from among the nearest corresponding points of the table.

As an additional option, the MEC-R9 offers the ability to run a post catalyst oxygen sensor. In many cases, a post catalyst oxygen sensor can enable the MEC-R9 to compensate for slight changes in the system over time.

Post catalyst control may be thought of as a separate controller unto itself. The post catalyst control loop adjusts the pre catalyst targets in order to richen or lean the engine as needed.

For optimum performance, MIRATECH’s MEC-R9 Rich Burn Air/Fuel Ratio Control is the right choice to use in conjunction with a 3-way catalyst.

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  • Gas Compression
  • Power Generation
  • NESHAP Regulations
  • Air Compression
  • Liquids Pumping
  • Bio-Gas