Excerpt: White paper – Influencing factors and measurement parameters for burner and boiler systems and their importance for optimizing efficiency and emissions
Heat generation in burner and boiler systems H3>
Boiler systems provide the necessary thermal energy for power generation, the heating of buildings, cement and glass manufacture and many other industrial applications. With fuels such as coal, oil or gas, they are capable of generating large quantities of energy with good overall efficiency.
Because large quantities of fuel are used for heat generation and large amounts of flue gases arise from the combustion, setting boiler systems involves achieving a high level of efficiency along with the lowest possible pollutant emissions – especially as the statutory emission limit levels for pollutants such as NOx, CO and CO₂ are becoming stricter and stricter.
For this reason, the emission values are determined during the commissioning and maintenance of boilers and burners, as well as for official measurements. The cost-effectiveness of the system and the setting of the burner can be comprehensively assessed using these data. It is important to know the basic principles of the combustion process and to understand the influence of the individual measurement and control parameters on performance and pollutant emissions in order to optimize the efficiency of the boiler system and to be able to adjust the emissions to the legal requirements.
The combustion process in burner and boiler systems
The other system components ensure the supply and distribution of the fuel, the transfer and dissipation of the heat and the discharge of combustion gases and combustion residues, such as ash and slag.
Combustion gives rise to numerous substances which are discharged from the combustion chamber as flue gas. Water vapour and carbon dioxide (CO₂) constitute the largest proportion of the flue gas or exhaust gas. These arise as reaction products from fuel and combustion air. Depending on the air supply, the flue gas also contains nitrogen oxides (NOx) or carbon monoxide (CO) and incompletely combusted fuel components. Impurities in the fuels may also mean the flue gas contains hydrogen sulphide, sulphur oxides, hydrofluoric acid (HF) and hydrochloric acid (HCI), and in addition soot, heavy metals and particulate matter are often to be found.
Chemical reactions during the combustion process H3>
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