The recovery boiler is designed for use in the production of heat, which is extracted from gases obtained by the operation of various industrial units and internal combustion engines. Such devices are not connected to any furnace and receive temperature exclusively from the exhaust gas. Some boiler utilizers act as process gas coolers in the production of sulfuric acid.
Typically, a steam recovery boiler is used in the metallurgical industry. In it, the gas temperature reaches +400 ° C, and when working with steelmaking furnaces - +1500 ° C. If the productivity of the enterprise is not so high, then equipment with forced circulation will be quite effective. Due to its design, the steam recovery boiler is practically safe for the environment, as it emits a minimum of pollutants into the atmosphere. In addition, it is economical, because the cost of gas cleaning is incredibly low, and uses fuel efficiently.
A steam recovery boiler is usually installed in diesel and gas power plants, microturbines, diesel boilers, etc. In the oil industry, carbon monoxide generated during the operation of engines is burned to generate energy. The resulting water turns into steam and is released to the outside. This method of gas processing is also valid in the metallurgical industry. Steam is sometimes used for technological needs in those enterprises where it is necessary. There is also a reduction in the cost of hot water (by obtaining it from a steam boiler). Residues of the spent substance are discharged through the chimney.
The design of the waste heat boilers is different. In addition to the above model, forced circulation, there is a model with natural circulation. Also distinguish the mechanism with a drum and without it. Some companies develop custom-made models taking into account the specifics of the installation site (for example, indoors or outdoors).
Depending on the purpose, the utilizers are hot-water and steam, having a afterburner, with one, two or three pressure levels, requiring horizontal or vertical installation, and many others. There are many types of utilizers that differ in converters (for ferrous and non-ferrous metallurgy) or used resources (coke, glass, sponge iron, steel and other materials).
It should be noted a modular steam recovery boiler, which is integrated into the flue gas installation easier than others, and does not require large expenses. It functions reliably with frequent load fluctuations, and also transfers heat very well.
Before installation, it is necessary to find out what power a particular waste heat boiler consumes . The usual power of the equipment is from 120 kW to 1700 kW. To do this, it is advisable to contact the specialists of the company installing the boilers so that they can tell in advance which model is best to purchase. Ladders and platforms are provided for servicing utilizers.