Regenerative heating furnace is essentially a combination of high-efficiency regenerative heat exchanger and conventional heating furnace, which is mainly composed of furnace body, regenerative chamber, reversing system, fuel, air supply and smoke exhaust system. Regenerator is the main body of waste heat recovery from flue gas of regenerative heating furnace. It is the chamber space filled with the regenerator and a part of the flue gas and air flow channel. In the heating furnace, the regenerative chambers are always used in pairs. One furnace can use one pair, several pairs or even dozens of pairs. More than 40 pairs can be used in some large domestic heating furnaces.
Advantages of regenerative waste heat recovery: uniform furnace temperature. As the furnace temperature distribution is uniform, the heating quality is greatly improved, and the product qualification rate is greatly increased. The fuel selection range is large for light oil, heavy oil, natural gas, liquefied petroleum gas and other fuels, especially for low calorific value blast furnace gas and producer gas, which has a good preheating and combustion supporting effect, expanding the application range of fuel. Therefore, the fuel consumption of the furnace is greatly reduced. For general large-scale heating furnace, energy can be saved by 25%~30%; For heat treatment furnace, 30%~65% energy can be saved. The traditional energy-saving technology is adopted for low NOx generation. The higher the preheating temperature of combustion supporting air, the greater the NOx content in flue gas; However, with regenerative high temperature air combustion technology, when the preheating temperature of combustion supporting air is up to 800 ℃, the NOx generation in the furnace is greatly reduced. As regenerative combustion is a diffusion combustion in a relatively low oxygen state, without a flame center, there is no condition for generating a large amount of NOx. The NOx content in the flue gas is low, which is conducive to environmental protection. Another advantage of low oxygen combustion of metal oxidation burning loss is to reduce the oxidation burning loss of the heated metal. In addition, regenerative combustion can also improve flame radiation intensity, strengthen radiation heat transfer, and increase furnace output.
