Milling Circuits

Our company deals with milling systems for the treatment of pulverized coal of the dry and wet bottom boilers.

Engineering of milling circuits, together with the combustion system and coal-fired boiler design, ensure effective cooperation and guarantee complex solutions from raw fuel bunkers up to the steam supply to the turbine. Technical designs are primarily focused on the milling systems with fan, hammer, vertical, and drum mills. Our team experts can also find solutions focusing on older milling circuits, and adjust their parameters to the new requirements of the customer.

Offered services
  • adjustment of mills to changes in fuel
  • improved performance of mills
  • improved pulverized coal fineness
  • extended mill control range
  • optimized milling process
  • thermal calculations of milling circuits
  • flow modelling FLUENT
  • strength calculations ANSYS
  • measurement of milling circuits including pulverized coal fineness
  • complete design and delivery of new mill rooms
  • design and delivery of anti-explosion measures
New Milling Circuits

We offer projects and installations of new milling equipment to fire lignite and bituminous coal. Primarily, we use the most widespread types of mills, i.e., fan and hammer mills to mill lignite, and vertical and drum mills to mill bituminous coal. The design of milling equipment and transportation routes always take into account the requirements of the entire combustion system with regard to the NOx emission and unburned carbon. To design the most effective alternative, high emphasis is laid on the entire lifetime of the equipment and future costs of maintenance and operation of the equipment. Special attention is also paid to the fire/explosion protection safety equipment, constituting an integral part of each milling equipment, and transportation routes.

Adjustment of the Existing Milling Circuits

Adjustment of the existing mills to new requirements is a frequently used alternative that, to the greatest possible extent, exploits the potential of the applied design, thus becoming a more economical option. Firstly, the original equipment is technically analyzed as the necessary precondition for the right choice of the new solution. A feasibility study, comparing several technical options including investment cost estimation, is the output.

Offered services
  • advisory and consultancy services
  • feasibility study
  • optimization of the existing equipment
  • project and engineering
  • deliveries of complete systems
  • assembly and putting of equipment into operation
  • servicing activities
Benefits for the customer
  • improved boiler efficiency
  • improved operating parameters
  • improved equipment reliability
  • reduced operating costs

A new solution is always based on the output and thermal calculations of the entire milling circuit, thus taking into account local operating conditions. Milling equipment design is closely connected to CFD modelling of flow. Applying this tool, milling processes can be optimized, in particular, sorting in the classifiers. The technical solution is always designed to emphasize the most appropriate used materials, and needs of the customer. Measurement of the operating parameters including pulverized coal sampling with the isokinetic probe is an integral part of the engineering.

Benefits for the customer
  • lower investment costs
  • individualized approach
  • improved mill performance
  • extended control range
  • improved milling fineness
  • reduced backfire

Technical problem – Measurement – Proposal for the solution – Feasibility study - Implementation