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Case Studies

Eliminating De-Rate and Maximizing Fuel Flexibility

EES conducted a successful demonstration on a 750MW tangential fired PC boiler using EES© CoalTreat™ technology for controlling slag in PRB boilers. The objective of the demonstration was to reduce molten slag and prevent plugging on the front face of the reheat section.

KLeeNwater ELG demonstration unit

A five gallon per minute KLeeNwater ELG demonstration unit was installed at a major utility to determine the most cost effective treatment program to meet ELG limits for either treat and discharge or zero liquid discharge (ZLD) scenarios.

Boiler Tuning for Emissions Compliance
An international chemical company needed to reduce NOx/CO emissions on their package boiler to meet state permit limits.

Burner Vibration of an Oil Fired Industrial Air Heater
A mineral supplier with an industrial air heater used for spray drying was experiencing problematic vibration.  After unsuccessful attempts to eliminate the vibration through tuning and OEM recommended changes, the customer contacted STEP for an onsite evaluation.

Combustion Diagnostic Testing
A utility boiler was de‐rated due to elevated opacity levels during high load operation.  STEP was contracted to provide field diagnostics in order to evaluate the root cause of the elevated opacity as well as to provide an action plan for opacity mitigation and future preventative measures.

Package Boiler Burner and Induced Flue Gas Recirculation System
A utility needed to convert their single fuel (heavy oil) to dual fuel (heavy oil and natural gas) boilers and reduce NOx emissions.

 Dual Fuel Wall‐Fired Boiler (230t/h)
An overseas industrial high‐tech materials manufacturer needed dual fuel burners and additional equipment for their new coal and natural gas fired boiler.

 Electrostatic Precipitator Capture Efficiency Improvements
A utility boiler equipped with a cold‐side electro‐static precipitator (ESP) is subject to chronic elevated opacity levels.

Sound Attenuation Analysis
A marine customer had to reduce the NOx emissions of a quad engine ferry utilizing a selective catalytic reduction (SCR) system.  The SCR catalyst and housing would replace the existing silencer, and the customer needed to verify that noise levels would remain the same.

Transient Piping Analysis
A utility boiler was experiencing regular opacity spiking during start‐up, along with burner trips and instability. Recent operation as a peaking unit with a high frequency of starts and stops, the utility needed to improve the opacity and reliability  during light‐off and warm‐up.

 Gas Conversion and Low NOx Retrofit of a 450 kpph Tangentially Fired Boiler
A North American utility company needed to convert a tilting tangential oil‐fired boiler to a dual fuel (natural gas and oil) unit. Additionally, heavy oil NOx emissions were to be reduced from the current low NOx burner levels.