Air and gas two-heat-accumulation heating furnace

Abstract

The invention relates to an air and gas two-heat-accumulation heating furnace. The air and gas two-heat-accumulation heating furnace comprises a heating furnace, 2-20 combustion gas heat accumulators, 2-20 air heat accumulators, combustion gas heat exchangers and air heat exchangers. Each of the combustion gas heat accumulators and the air heat accumulators is provided with a heat accumulation combustion chamber. The combustion gas heat accumulators are divided into two groups of combustion gas heat accumulators, each group of the combustion gas heat accumulators is connected with a combustion gas pipeline and an exhaust gas discharge system through triple valves respectively, the other side of each group of the combustion gas heat accumulators is connected with the combustion gas heat accumulation combustion chambers, and the combustion gas heat accumulation combustion chambers are connected to the combustion gas inlets of flat flame burners through cone valves. The air heat accumulators are divided into two groups, each group of the air heat accumulators is connected with an air pipeline and an exhaust gas discharge system through triple valves respectively, the other side of each group of the air heat accumulators is connected with the air heat accumulation combustion chambers, and the air heat accumulation combustion chambers are connected to the air inlets of the flat flame burners through cone valves. The air and gas two-heat-accumulation heating furnace realizes the stationary heating operation of the heating furnace, optimizes the heating effect and the operation stability and improves the qualities of heated products through the alternative heat ambulation of the two groups of the combustion gas heat accumulators and the two groups of the air heat accumulators and the preheating of air or the combustion gas.

Description

technical field [0001] The invention belongs to the technical field of steel rolling and metal heat treatment equipment, and relates to a heating furnace, in particular to an air gas double regenerative heating furnace. Background technique [0002] In the steel rolling production process, various steel billets and steel materials need to be heated to a given temperature and kept for a certain period of time. Billet heating is an important link in the steel rolling production line, and it is responsible for the task of providing qualified steel billets for the rolling process. The use of low-calorific-value fuels for heating not only purifies the environment but also saves energy, but the low-calorific-value fuels have a low combustion temperature and cannot meet the heating needs of steel billets. The air and gas double heat storage method is used to preheat the air and gas before burning, which can meet the requirements of billet heating. [0003] The regenerative heatin...

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Problems solved by technology

[0003] The regenerative heating furnace of the prior art has two intractable defects: one is that the furnace pressure is unstable due to frequent reversing, and the instability of the furnace pressure has a negative impact on the operation of the heating furnace, such as the furnace head igniting or sucking cold air etc. In severe cases, the equipment will be damaged

The second is the constant change of the combustion atmosphere, which has an impact on the products on the surface of the billet, and the formed oxide scale is difficult to remove, which affects the quality of hot-rolled products

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