Combustion boiler fuel efficiency

Introduction

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Controller Atmosphere Monitoring

ll combustion processes require the correct ratio of fuel and Oxygen (O₂). Incomplete combustion directly affects the performance and operational costs of a system.

The result of incorrect combustion include fuel waste, an increased level of toxic emissions and a possibly damaging use of he overheads of fuel consumption and system value are high in large scale industrial and commercial boilers/furnaces carry. In order to see return of investment and minimal running costs the operation must be kept at peak efficiency.

Complete combustion requires the ideal ratio of fuel to air. This is optimised and maintained by measuring the output O₂ level of the exhaust/flue gas by using an SST Zirconia (ZrO₂) sensor in a closed loop feedback system to a controller for regulating the input mix. This is especially useful when the quality of fuel supplied may vary (i.e. gas from different sources)

The diagram to the right is an example of a combustion process using the SST ZrO₂ sensor (OXY-Flex) as a feedback signal into the controller system. The graph above shows how combustion efficiency and emissions against the air to fuel ratio.

SST Sensing designs and manufactures solutions with a unique type of ZrO₂ sensor and interface electronics that ensures failsafe operation:

SST Sensing designs and manufactures solutions with a unique type of ZrO₂ sensor and interface electronics that ensures failsafe operation:

  • Accurate and selectable measurement range, up to 25% or 100%
  • Established, long operating life technology – non-depleting sensor cell
  • Low maintenance and easy assembly
  • Calibrate in fresh air (20.7%) or other known O₂ concentration
  • Gas temperature up to 400⁰C
  • Fast response time (as low as 4s)
  • Robust stainless steel construction
  • Complete solutions available – sensor + interface electronics
  • Industry standard output options: 0-10V, 4-20mA and RS232/RS485 RTU
  • Expert technical/application support and customised solutions available
  • RohS compliant

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