Pellet shaft furnace waste heat comprehensive recovery device

Abstract

Disclosed is a pellet shaft furnace waste heat comprehensive recovery device. The pellet shaft furnace waste heat comprehensive recovery device comprises a sintered pellet belt cooling machine waste heat recovery device and a steam-water separation device. The sintered pellet belt cooling machine waste heat recovery device comprises a heat exchange device. The heat exchange device comprises a box body, a superheater, an evaporator and an economizer, wherein the superheater, the evaporator and the economizer are arranged in the box body in sequence in the smoke flowing direction. A water outlet and a water inlet of the economizer are communicated with the steam-water separation device and a water supply pipeline through pipelines respectively. A water outlet and a water inlet of the evaporator are communicated with a water inlet and a water outlet of the steam-water separation device through pipelines respectively. A steam outlet and a steam inlet of the superheater are communicated with a steam outlet of the steam-water separation device and a user steam pipeline through pipelines respectively. The pellet shaft furnace waste heat comprehensive recovery device further comprises a drying bed girder waste heat recovery device and an air guide wall girder waste heat recovery device. By the adoption of the pellet shaft furnace waste heat comprehensive recovery device, the smoke waste heat is utilized in a gradient mode, and the heat transfer loss caused by the temperature difference is reduced to the greatest extent; and meanwhile, saturated steam is turned into superheated steam, the quality of the steam is improved, and the follow-up efficient and stable utilization of the steam is achieved.

Description

technical field [0001] The invention relates to a comprehensive recovery device for waste heat of a pellet shaft furnace, which belongs to the technical field of waste heat recovery of metallurgical equipment. Background technique [0002] The pellet shaft furnace is a shaft furnace used for roasting metallurgical pellets; the shaft furnace produces pellets, which are a method of finely grinding iron concentrate or other iron-containing powders to form agglomerates. , pelletizing, roasting, and cooling are composed of six major links. The required equipment includes batching system, grinding system, pelletizing system, drying system, shaft furnace roasting system, and auxiliary gas station, fan system, circulation system, dust removal and Composed of desulfurization system and cooked ball cooling system. [0003] After batching, drying, moistening and pelletizing, the qualified green pellets are sent to the shaft furnace for roasting, and then roasted in an oxidizing atmosp...

AI Technical Summary

Problems solved by technology

But the main problems are: the vaporization cooling system is relatively simple, the waste heat recovery of the cooling components of the shaft furnace body is insufficient, the steam production is small, the thermal inertia is small, the temperature difference between the feed water temperature and the steam-water separation device is large, the feed water is not well controlled, and the system is stable. Poor; at the same time, saturated steam is produced, and the steam quality is poor

However, the main problem is that the flue gas in the shaft furnace and the waste heat carried by the cooked balls are not recovered, and the waste heat is not fully utilized.

[0009] To sum up, the existing waste heat recovery methods for pelletizing shaft furnaces have shortcomings such as small amount, single, insufficient waste heat recovery, poor stability of the recovery system, and poor quality of recovered steam. Therefore, it is necessary to develop a system from the perspective of the system Comprehensive waste heat recovery device to properly solve the above problems

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