Innovative Combustion Technologies provides combustion-side technical expertise to power plants, enabling them to resolve operational and maintenance challenges, optimise combustion, improve unit capacities and reduce emissions. Drawing on its 20-plus-years' experience, the company develops methods and guidelines to address the challenges that face the power industry.
Optimum combustion can contribute to significant improvements in heat rates and emissions. It occurs when combustion is completed in the lower furnace, while achieving emissions standards and reducing slagging propensity.
Optimum combustion results in the following:
ICT employs the following services to optimise combustion:
The primary contributors to elevated NOx emissions are inadequate pulveriser performance, improper airflow management and an unclean furnace. ICT takes a methodical approach to optimising combustion and reducing NOx emissions by optimising airflow management and improving pulveriser performance, and through burner tuning. To optimise airflow management, ICT offers calibration/design of airflow measurement devices. It improves pulveriser performance through recommendations that include adjustments to mechanical variables/tolerances (inside the pulveriser) to enhance fuel fineness and burner-line air/fuel balances. Burner tuning is performed as a part of an iterative process consisting of burner adjustments and furnace exit HVT (high-velocity thermocouple) traverses, until an optimal condition is obtained.
ICT has found that slag prevention is more effective than managing slag incidents. Combustion should be completed lower in the furnace, allowing water walls to absorb more heat, which reduces furnace exit-gas temperatures to below ash-softening temperatures. Slag prevention can also be achieved by maintaining an oxidising furnace atmosphere, since ash-fusion temperatures are lower in a reducing atmosphere. Managing raw coal size, fineness and air-to-fuel ratios assists with the self-cleaning of pendant and platens.
To aid slag prevention, ICT performs pulveriser performance optimisation, verification testing of plant instrumentation (O2 probes, pressure transmitters and coal feeder rate) and evaluation of operating practices when slagging occurs.
ICT has developed a list of prerequisites imperative to optimum combustion: