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Modernization

The scope of revamping projects undertaken by Energotechnika Energorozruch SA includes:

  • NOx emission reduction
  • Deep NOx emission reduction less than 200 mg/std.m3
  • Biomass boiler feeding systems
  • Boiler efficiency improvement
  • Reduction of boiler technical minimum output
  • Revamping of mills and fans
  • Introduction of biomass co-burning systems with direct furnace injection
  • Research on new boiler processes

In each of the above scopes we guarantee complete engineering, from concept, through modelling and design, supervision over fabrication and erection, commissioning, optimization and final acceptance tests. 

We have reduced NOx emissions in more than 65 power boilers, including 6 where emission was reduced to less than 200/300 mg/std.m3.

Implementation of our modern processes enables us to achieve high operating efficiency, including:

  • NOx emissions within 180-200 mg/std.m3 calculated for 6% O2 in boilers with tangential furnaces
  • NOx emissions within 230-300 mg/std.m3 calculated for 6% O2 in boilers with swirl burners
  • CO emissions less than 50 mg/std. m3 calculated for 6% O2
  • Maximum use of existing furnace system
  • Maintain temperature of final and superheated steam in a wide operating range
  • Maintain combustibles content in fly ash within 2-5%, in bottom ash within 3-8%.
  • Efficient protection of waterwalls against low-oxygen corrosion 

The applied concept of biomass burning or co-burning improved the boiler efficiency by:

  • stable boiler and mill operation during biomass feeding
  • possibility of continuous biomass feeding with no loss in mill output
  • reduction of load in mills due to reduced fuel demand
  • increased proportion of biomass burned in boiler
  • reduced NOx emission from boiler

Boiler operation with biomass co-burning or other fuel quality variation may deteriorate mill operating conditions. This may lead to deterioration of combustibles content and/or reduction of mill output.

Moreover, the deep NOx emission reducing combustion systems now introduced require high quality of coal dust.


This requires the revamping of mill systems, which includes:

  • Adjustment of coal dust quality by remotely controlled size classifier deflectors
  • Modification of air feed systems in mills
  • Modification of pulverizing systems in mills
  • Installation of controllable dust separators

The above means enable improvement of mill operation and fuel quality attained with various grade of biomass added.

 

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