Sylvamo
Rotating Grate
With the objective of increasing its energy self-sufficiency, Sylvamo signed a contract with HPB for the supply of a new steam generating unit, to be installed at the Mogi Guaçú plant, in the state of São Paulo, Brazil.
The steam generator will be designed, manufactured, and assembled under the technology of The Babcock and Wilcox Company, USA, and will feature state-of-the-art Spreader Stoker combustion system for high energy conversion efficiency with low environmental impact.
Technical Features:
Natural circulation boiler, single drum, convection bank with plain tubes, superheater divided into two modules—the first in counterflow and the second in parallel flow with the flue gases—suspended by steel structures and furnace built with membrane wall tubes.
Spreader Stoker combustion system over a rotary grate, for continuous ash discharge, equipped with an inertial collection system with multicyclones, sand separation and classification system, and recirculation of unburned material to the furnace.
Heat recovery will be carried out through an economizer, installed at the boiler outlet, followed by an air preheater divided into two (2) modules.
An Electrostatic Precipitator, installed before the induced draft fan, ensures particulate emissions remain below 100 mg/Nm³.
Location: Mogi Guaçú - São Paulo - Brazil
Operation: November 2012
Boiler Technical Data:
Technology and Engineering: HPB Engenharia e Equipamentos Ltda. | B&W
Maximum Steam Flow: 210,000 kg/h
Steam Operating Pressure: 87 bar
Final Steam Temperature: 485 °C
Start-up Fuel: Natural Gas
Auxiliary Fuel: Natural Gas
Main Fuel: Biomass residues with an average moisture content of 50%
Boiler Thermal Efficiency: 87.15% (LHV) burning biomass | 93.22% (LHV) burning Natural Gas
Guaranteed Emissions: @8% OF O2CO: < 50 mg/Nm³ | Particulates < 100 mg/Nm³ NOx < 250 mg/Nm³