Cleaning system optimization and research

 

 

 

 

 

 

 

 

Different types of emission control techniques are available to reduce emissions from large and medium scale energy production plants. Commonly used techniques include scrubbers, bag house filters and ESPs (Electrostatic precipitators) and often these are combined together to ensure effective removal of particulate matter and other pollutants from the flue gas. Besides measuring emissions to the environment directly from the outlet of the power plant stack, particle measurements can also be used as tool to develop and optimize the operation of the flue gas cleaning and treatment devices as well as the actual combustion process. Particle measurements, and especially real-time size-resolved particle measurements, are a fast and cost effective way to adjust after treatment devices for optimal use of energy and water yet achieving low emissions into the environment. These adjustments can ultimately lead to reductions in the plant operation costs and postpone or avoid investment costs related to repair and renewal of the flue gas cleaning devices.

 

Electrostatic precipitator optimization

  • Optimize ESP power consumption while keeping emissions as low as possible
  • Understand the link between plant operating conditions, ESP operating parameters and ESP particle size resolved penetration.
  • Achieve by performing real-time size resolved particle measurements after the ESP while adjusting parameters.

Baghouse filter optimization

  • Optimize power consumption of the flue gas fans and frequency of the filter bag changes
  • Balance the filter cleaning cycles, particle penetration and pressure drop of the filter
  • Achieve by performing real-time size resolved particle measurements after the filter

Scrubber optimization

  • Optimize scrubber water consumption while lowering penetration of PM.
  • Understand the effect of water droplet size and mixing of the water with flue gas in the scrubber to the emissions. Water droplet size is affected by nozzle design and water injection pressure while mixing is driven by the turbulence of the gas flow.
  • Achieve by direct real-time particle measurements in the wet stack.

Sorbent injection optimization

  • Optimize sorbent consumption while keeping the emissions low.
  • Optimize sorbent material surface area for maximal effect and verify stability and dispersion of the sorbent in the stack
  • Achieve by measuring active surface area and size of the sorbent particles in real-time

 

The efficiencies of these emission treatment and cleaning devices are dependent on the particle size and should therefore be determined separately for different sized particles. The most efficient way to determine proper operation of the cleaning devices in different conditions is to use a real-time particle size distribution measurement method, such as the ELPI®+ which measures particle size distribution 6 nm - 10 µm. Compared to traditional gravimetric methods, the real-time measurement enables immediate detection of the effect of even small time-scale changes in the process.

The Dekati® ELPI®+ is a superior tool for filter efficiency studies but it can also be used to optimize the filter, ESP or scrubber operation e.g. for new fuels and different sorbents. At best the ELPI®+ data can be used to increase the life time of the cleaning devices, decrease the energy consumption of the cleaning devices and reduce the amount of water used by the scrubbers.

Dekati® particle measurement solutions include: