An energy-saving heating furnace system for recovering waste heat from flue gas and a method for recovering waste heat from flue gas

Abstract

The invention discloses a heating furnace system for recycling smoke waste heat. The heating furnace system comprises a heating furnace, wherein the heating furnace is communicated with a heat exchange unit by virtue of a high-temperature smoke pipeline, the heat exchange unit is communicated with a chimney by virtue of a low-temperature smoke pipeline, and the heating furnace is communicated with the heat exchange unit by virtue of a high-temperature air pipeline; the heat exchange unit is communicated with a fan by virtue of a low-temperature air pipeline, the heat exchange unit comprises an air mixing chamber and a heat storing chamber, the air mixing chamber is provided with a burner, and the burner is respectively communicated with air and coal gas. The invention also discloses a smoke waste heat recycling method. The system is simple in structure, and coal gas with low heating value is adopted for production, so that the dosage of coal gas with high heating value is reduced, and the heating furnace system is energy-saving and environment-friendly; the smoke waste heat can be recycled by virtue of the energy-saving heating furnace system, so that the energy loss is reduced and the production cost is lowered; the method is simple in technology, high in feasibility and favorable in waste heat utilization effect.

Description

technical field [0001] The invention relates to waste heat recovery of flue gas in the field of metallurgy, in particular to an energy-saving heating furnace system for recovering waste heat of flue gas and a method for recovering waste heat of flue gas. Background technique [0002] In the metallurgical industry, furnaces are used to heat metal blanks to be processed. The heating furnace burns fuel, and the high-temperature flue gas generated by fuel combustion flows in the furnace, and the heat is transferred to the metal billet and the furnace wall through the unsteady heat transfer process, and then discharged out of the heating furnace through the exhaust port. The temperature of the flue gas discharged from the heating furnace is relatively high. In the later stage of the heating period and the holding period, the temperature of the flue gas can reach 1100 ℃ ~ 1250 ℃. Recycling and utilizing a large amount of physical latent heat contained in it is a key technology to ...

AI Technical Summary

Problems solved by technology

However, the regenerative burner needs a fast switching device to match it, and it needs to be switched every few minutes, which requires high equipment level and control level, and because the temperature of the flue gas in the furnace is low in the early stage of heating up, the preheating temperature of the air is also relatively high. Low, high calorific value gas must be used as fuel for rapid heating of metal billets, high operating costs

Waste heat boiler power generation is also applied to the heating furnace of some iron and steel enterprises. The method is to install an evaporator on the flue gas pipeline to produce supersaturated steam, and use the supersaturated steam to drive the steam turbine to work, thereby realizing power generation. The flue gas volume and flue gas temperature are not constant and have the characteristics of discontinuity. Therefore, this method has its limitations in application, and has the disadvantages of large investment and small income.

[0004] Therefore, we urgently need a new flue gas waste heat recovery and utilization system to solve the defects of large investment and high cost of the existing flue gas waste heat recovery system

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