Heat recovery system

Waste heat generated in industrial processes or power plants is recovered and heating water or steam is produced with waste heat boilers. If there is waste heat to be recovered, waste heat boiler is specially designed according to flow rate, temperature and other waste heat parameters. While waste heat boilers can be designed as smoke tube design, for example, waste heat boilers can be designed as water tube design to meet the high steam pressure requirement for much higher flow rate exhaust gases formed as a result of the combustion process of turbines in power plants. This type of steam boiler systems is called "HRSG- Heat Recovery Steam Generator)". HRSGs are high-efficiency heat exchangers that are used to extract heat from an exhaust gas stream to convert water into steam for use in combined cycle generation, or to produce steam for use in industrial processes. They consist of a complex arrangement of pipes with water flowing through them while exhaust gases are passing exterior surfaces of the water tubes. When water exchanges heat with the hot gas, it is converted into steam. The primary components within the HRSG are the superheater, the evaporator, and the economizer. Duct burners are usually installed before the superheaters, while selective catalytic reduction (SCR) units are often deployed to reduce NOx levels.