Fossil fuel consumption and greenhouse gas carbon dioxide emissions continue to increase in the world. Efficient use of energy, economic management and quality production are essential in industry. In addition, the production made by reducing the greenhouse gas CO2 emission improves the environmental quality of the companies. A significant amount of waste heat is thrown into the atmosphere with the hot flue gases released as a result of the process and combustion in industrial facilities. It is possible to economically recover a certain part of this waste heat in a way that will increase the energy efficiency of the enterprise and reuse it for waste energy efficiency.
It is very important to increase energy efficiency, reduce fossil fuel consumption and greenhouse gas CO2 emissions by recovering the high-temperature waste heat generated as a result of combustion and process in furnaces and using it for preheating the combustion air. These works can be done with central recuperators and recuperative burners.
Recuperative burners: These are used as flues to preheat the exhaust gas heat of the combustion air. Since modern recuperative burner systems have significantly higher efficiency than older systems, savings can be achieved by replacing old or aging recuperative burners.
If it is used in recuperative burners as a process or combustion temperature of 900 °C in the furnace, the exhaust gas temperature at the heat exchange inlet, the preheated air temperature, the combustion air is heated up to 400 °C and the combustion air provides energy savings up to 40% compared to the unpreheated cold burners.
Recuperative Burners, as part of the burner design, have heat exchanger surfaces that receive the heated heat passing through the burner body. The recuperative burner uses the heat of the exhaust gas to heat the combustion air before mixing it with fuel. Recuperative burners consist of an internal heat exchanger with various features such as pipes, chutes, countercurrent flow and fins used to provide thermal contact between the heat of the waste exhaust gases and the combustion air from the supply pipe. The design works by collecting both exhaust gas and waste heat from the body of the recuperative burner nozzle and using both to transfer them to the combustion air. Preheating the combustion air results in increased combustion efficiency and thus more heating from the nozzle. It should be noted that the burner and nozzle are located in the furnace body and the waste heat is transferred from the exhaust gases to the burner by convection.
CLASSIFICATION OF SELF-RECUPERATIVE RECUPERATIVE BURNERS
It can be classified as convectional, radiation, combined, ceramic, metallic, high efficiency, compact, high speed flame, Low NOx.
Burners with a recuperative system use the same principle of heat exchangers as they recycle the heat of the exhaust gases to preheat the combustion air before it mixes with the fuel. The heat exchanger can be made of metallic or ceramic materials placed inside the burner.
Self-recuperative high-speed burners are free flame, long or straight flame. However, it is also available in an indirect fire version for radiant pipes. The limiting conditions are that the burner and nozzle must be placed in the furnace body.
USAGE AREAS OF RECUPERATIVE BURNERS
Aluminum melting furnaces for aluminum recovery, EAF furnaces, Rolling mills, annealing furnaces, melting furnaces, fiberglass, metal casting, gas incineration furnaces, radiant tube systems. Reheating furnaces, enamel furnaces, polymer industry, glass melting furnaces, food drying, ceramics and metallurgy industries are used intensively. In addition, many furnaces as bright annealing, curing, carbonization, austenitization, tempering, hardening, carbonitration, normalization, crucible drying, ladle heating, frying furnaces, homogenizing furnaces etc. are used.
Capacity Range: Power ranges suitable for 4 kw-650 kw process
Metal or ceramic barrel applications
Use with temperature dependent ceramic or metallic radiant tubes
Fuels: Natural gas, propane, LPG, low calorie gases.