Electric arc furnace smoke radiation type waste heat boiler recovery system

Abstract

The invention discloses an electric arc furnace smoke radiation type waste heat boiler recovery system, which comprises a radiation type waste heat boiler and a heat accumulator. The radiation type waste heat boiler is provided with a smoke homogeneous flow chamber, a water cooling radiation heat exchange chamber, a convection heat exchange chamber, a steam pocket, an ash discharging device and the like. After passing through a settling chamber, the smoke of an electric arc furnace enters the smoke homogeneous flow chamber; after being homogeneous, the smoke enters the water cooling radiation heat exchange chamber; after being exchanged with a water cooling wall and a radiation water cooling screen, the smoke enters the convection heat exchange chamber; after the smoke is exchanged with an evaporator and an economizer, the temperature of the smoke is greatly reduced; then, the smoke is discharged from the boiler system; after being dedusted, the smoke is discharged; and, after entering the heat accumulator to be stabilized, intermittent steam discharged by the steam pocket is changed into continuous steam provided for production or power generation. According to the electric arc furnace smoke radiation type waste heat boiler recovery system disclosed by the invention, the smoke heat of the electric arc furnace can be sufficiently recovered; the heat is up to 70% of the heat of the smoke discharged by the electric arc furnace; the system can be suitable for smoke temperatures of various electric arc furnaces; and equipment of the recovery system has the advantages of steady and reliable operation and low maintenance and operation cost.

Description

technical field [0001] The invention relates to a recovery system for electric arc furnace flue gas radiation type waste heat boiler. Specifically, it can efficiently recover the heat of high-temperature flue gas discharged from the electric arc furnace, reduce the exhaust gas temperature to the greatest extent, ensure the safe operation of dust removal equipment, and reduce the dust removal electricity. consumption, which belongs to the technical field of energy saving and environmental protection produced by electric arc furnaces. Background technique [0002] At present, in the production process of electric arc furnace steelmaking, the temperature of the discharged high-temperature flue gas is very high, generally between 1300°C and 1600°C, and it must be cooled before dust removal. At present, the following cooling methods are usually used: direct mixing of cold air, water-cooled flue, spray cooling, heat pipe boiler and ordinary steel pipe waste heat boiler cooling, et...

AI Technical Summary

Problems solved by technology

There are many disadvantages in the above cooling methods: 1. Directly mixed with cold air cooling method: the air volume after cooling increases greatly, which needs to increase the initial investment and operation cost of the exhaust fan, motor, and dust collector, and wastes the heat in the flue gas

2. Water-cooled flue cooling method: a large amount of cooling water is required for cooling, and cooling equipment for cooling water is required, which not only wastes the heat in the flue gas, but also increases the power consumption of the cooling water system

3. Spray cooling: Consuming cooling water and increasing the water content in the flue gas not only makes the dust bag easy to condense, but also easily causes the bag to fail in hydrolysis, and also wastes the heat in the flue gas

4. Heat pipe waste heat boiler cooling method: Since the heat pipe can only withstand the flue gas temperature of about 850°C, this method can only recover the heat of the part of the flue gas below 850°C; the heat pipe of the heat pipe waste heat boiler has a short service life and high operating costs; The heat pipe waste heat boiler has a large volume, occupies a large area, and requires a large initial investment

5. Ordinary steel pipe waste heat boiler: at the inlet of high-temperature flue gas, the pipeline is easily damaged due to high-speed scouring. In addition, the evaporator and economizer are prone to ash accumulation and blockage, which affects the operation of the system

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