A Rotary Hearth Furnace Combined Waste Heat Recovery System

A technology of waste heat recovery system and rotary hearth furnace, which is applied in the direction of furnace, waste heat treatment, furnace components, etc., can solve the problems of large investment, poor economy, land occupation and large investment, and achieve low operating cost, convenient source, and avoid secondary The effect of secondary oxidation
CN105758205BInactive Publication Date: 2017-11-07JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU PROVINCE METALLURGICAL DESIGN INST
Publication Date
2017-11-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a rotary hearth furnace combined waste heat recovery system which comprises a settling chamber connected with the top end of a rotary hearth furnace and a DRI cooling furnace connected with the bottom end of the rotary hearth furnace.The settling chamber is connected with a waste heat boiler through a settling pipe.Smoke in the waste heat boiler enters an air heat exchanger.The smoke in the air heat exchanger enters an induced draft fan through a bag-type dust collector, and the smoke in the induced draft fan enters a smoke exhaust chimney.The smoke exhaust chimney is connected with a high-pressure fan through a pipeline.An oxygen detecting device, an oxygen treating device and an air supplementing device are sequentially arranged on the portion, between the high-pressure fan and the smoke exhaust chimney, of the pipeline.Cooling air sucked by the high-pressure fan enters a cooling air ring channel of a DRI cooling furnace and penetrates through an air channel to exchange heat with hot materials in the DRI cooling furnace, and air after heat exchange enters the settling chamber through the pipeline.Waste heat in the high-temperature smoke generated by the technology of the rotary hearth furnace and waste heat in the hot materials are recovered at the same time, a part of the purified low-temperature smoke can be circulated by itself to be fed into the DRI cooling furnace as cooling media to conduct heat exchange and cool the hot materials, and the operation cost is low.
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Description

technical field

[0001] The invention relates to a combined waste heat recovery system of a rotary hearth furnace, belonging to the field of mechanical equipment. Background technique

[0002] Rotary Hearth Furnace (Rotary Hearth Furnace) process can be used to pre-reduce iron ore, and can also process dust generated by metallurgical plants, and other metallurgical wastes containing iron, chromium, and zinc. The rotary hearth furnace is equipped with carbon pellets or agglomerates as raw materials. Under the high temperature environment of 1250-1350 ℃, the metal oxides in the carbon-containing pellets are quickly reduced by carbon to form metallized pellets. The discharge temperature of the pre-reduction furnace material produced by the rotary hearth furnace process is generally around 1000 ° C, and it is pushed out of the furnace by a screw discharge machine. The rotary hearth furnace process also produces high-temperature flue gas, which takes away ~50% of the heat of the ...

Claims

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