Device with griddle and process for generating power by efficiently recycling sinter waste heat

Abstract

A device with a griddle and a process for generating power by efficiently recycling sinter waste heat relate to the technical field of waste heat power generation. The device comprises a sinter cooling system, a waste heat power generation system and a smoke system. The sinter cooling system and the waste heat circulation power generation system are connected through the smoke system to form a loop. The process includes 1) sinter cooling, 2) the smoke system and 3) waste heat power generation. The device and the technological process for waste heat power generation have the advantages of completely utilizing waste heat discharged in the sinter cooling process, obviously increasing power generation quantity, obviously reducing system self power utilization rate and being remarkable in energy-saving effect.

Description

Technical field [0001] The invention belongs to the technical field of waste heat power generation, and in particular relates to a sintered ore waste heat efficient recovery power generation equipment and process with a mine screen. Background technique [0002] The iron and steel industry is an important basic industry of the national economy, and its energy consumption accounts for about 15% of the country's total industrial energy consumption. It is a key industry for energy conservation and emission reduction. In the iron and steel production process, the energy consumption of the sintering process is relatively high, generally 10-12% of the total energy consumption of the iron and steel enterprise, second only to the ironmaking process, and the energy saving potential is huge. In the sintering process, the hot sintered ore discharged from the sintering machine must be cooled to about 150°C before entering the next process. At present, sintered ore is cooled by air medium th...

AI Technical Summary

Problems solved by technology

[0007] 1. Insufficient heat exchange

Cross-flow heat exchange between sinter and cooling air on the belt cooler or ring cooler, the heat transfer effect is poor; the accumulation height of the sinter material layer is low, the heat exchange time between hot sinter and cooling air is short, and the heat exchange is insufficient

[0008] 2. Poor sealing and serious air leakage

The quality of the sealing effect directly determines the performance and power generation of the power generation system. Limited by the structure of the belt cooler or the ring cooler, the seal of the belt cooler or the ring cooler is poor, and the air leakage is serious

[0009] 3. Low utilization efficiency of waste heat

In the existing sintering machine waste heat power generation system, the air is generally taken from the higher temperature sections I and II of the belt cooler or ring cooler, and the heat exchange end difference between the sintering ore and the cooling air is large, the flue gas temperature is low, and the waste heat utilization efficiency is low , the project investment payback period is long

[0010] 4. High power consumption

In addition, because the air leakage problem of the system is difficult to solve, it also increases the cooling power consumption

[0011] 5. Large fluctuations in waste heat parameters affect the safety and stability of waste heat power generation and waste heat power generation system

During the production process of the sintering machine, short-term shutdowns within 30 minutes often occur, resulting in frequent shutdowns of waste heat turbine generators, which seriously affect the power generation and the safety and stability of waste heat power generation systems

[0012] 6. Pollution of the environment

A small part of flue gas with a higher temperature from the ring cooler or with cooler enters the dual-pressure waste heat boiler for utilization. Some of the utilized flue gas is recycled, and some are directly discharged, and most of the rest of the unused flue gas is directly discharged. cause environmental pollution

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