Uniform temperature distribution
A uniform temperature distribution in the combustion chamber has many advantages. It allows stronger operation modes and thus higher efficiency. It reduces corrosion and slagging of the steam generator and is a prerequisite for high denitrification and low fuel consumption values in the SNCR.
The local gas temperatures above the furnace are a sensitive and reliable indicator for the local stoichiometry. Thereby they provide important information about the necessary oxygen input as temperature imbalances always indicate imbalances of the oxygen ratio.
Reduced imbalances – more uniform oxygen concentration – reduction of exhaust gas losses
Temperature imbalances are compensated by active balancing control. The consequence is a more uniform oxygen concentration in the combustion chamber. Areas with oxygen deficiency disappear. Now the average oxygen excess can be reduced – without compromising the burnout quality. As with active balancing control permanently less combustion air is required, the exhaust gas losses of the boiler decrease and the efficiency of the plant increases.
Strict combustion control possible
The reduction of the air volume is the key to a strict combustion control in incineration plants. With the primary air operation, grates equipped with agam can be operated at a stoichiometry close to 1. The gas burnout is ensured by an active temperature-controlled secondary air control.
Reduced amount of injection water due to more uniform steam parameters
In addition to lower exhaust gas losses, even more uniform steam parameters can be achieved by active balancing control. The amount of injection water decreases and the efficiency increases. The power plants Schwarze Pumpe, Lippendorf and Boxberg with a performance of 800-950 MW each have achieved significant improvements with agam. The coal-fired power plant Rybnik indicates a reduction of the amount of injection water of up to 0.4 t/h.
Efficiency improvement of 0.5 %
In the EDF power plant Rybnik agam is operated together with an optimization system of Emerson. The system moves the fireball such that CO and NOx emissions, air ratio and steam parameters are within the operating optimum. EDF Polska mentions an efficiency increase of 0.5% and reduced emissions and less unburned residues in the ash. For the Rybnik power plant this corresponds to savings of 3,000 tons of coal and 6,000 tons of CO2 per year.
Reduction of SNCR additives of up to 40 %
A uniform temperature distribution and a resulting improved combustion always lead to a reduction of the additive consumption in the SNCR. Savings of 20-40% are observed regularly. In the RDF power plant Weener the additive consumption was reduced by 30% due to a reduction of the temperature imbalance in the combustion chamber by 80°C.
Improvements in the waste incineration plant Moerdijk
The waste incineration plant Moerdijk uses an automated active balancing control, thus achieving the following improvements:
- 60-90 % less corrosion
- 8 % more throughput
- 6 % higher availability
- 54 % less natural gas consumption
- 2 % lower on-site power requirement
- 29 % less ammonia consumption for the SNCR
Precise, high-resolution gas temperatures allow optimum active balancing
Our acoustic gas temperature measurement system agam provides precise and reliable values regarding the distribution of the gas temperature above the furnace. agam shows a two-dimensional image of the gas temperature and thus diagnoses imbalances in the combustion chamber. Fast and accurately so that countermeasures can be taken early in time to balance the temperatures accordingly.