Furnace type efficient recovery system for flue gas waste heat of cooled sinter

Abstract

A furnace type efficient recovery system for flue gas waste heat of cooled sinter comprises an air blower, a cooling furnace, a primary dust remover, an emergency blow-off valve, a waste heat boiler, a secondary dust remover, a draft fan and a chimney. An outlet of the air blower is communicated with a cooling air inlet on the lower portion of the cooling furnace. A flue gas outlet on the upper portion of the cooling furnace is communicated with the primary dust remover, the waste heat boiler, the secondary dust remover, the draft fan and the chimney through pipelines successively. The emergency blow-off valve is arranged on a pipeline between the primary dust remover and the waste heat boiler. A connection pipeline is arranged between the draft fan and the air blower. The furnace type efficient recovery system for flue gas waste heat of cooled sinter has the advantages that the sinter quality is improved, the sinter return rate is reduced, flue gas parameters are stable, the system own power consumption rate is reduced, and the energy-saving effect is apparent.

Description

technical field [0001] The invention belongs to the technical field of waste heat power generation, and in particular relates to a system for efficiently recovering flue gas from furnace-type cooling sinter waste heat. 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 total industrial energy consumption in the country. It is a key industry for energy conservation and emission reduction. In the process of iron and steel production, the energy consumption of the sintering process is relatively high, generally accounting for 10-12% of the total energy consumption of iron and steel enterprises, second only to the ironmaking process, and has a huge potential for energy saving. 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, the sinter is cooled by u...

AI Technical Summary

Problems solved by technology

[0007] 1. Insufficient heat exchange

Cross-flow heat exchange between sinter and cooling air in belt cooler or ring cooler, the heat transfer effect is poor; the accumulation height of 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. The heat exchange end difference between the sintered ore and the cooling air is large, the flue gas temperature is low, and the working capacity is lost. Large, low waste heat utilization efficiency, long project investment payback period

[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

The output, temperature, and composition of sinter fluctuate greatly during the production process, resulting in large fluctuations in flue gas parameters after heat exchange, which has a great impact on the utilization of waste heat

[0012] 6. Pollution of the environment

A small part of flue gas with a high temperature from the ring cooler or with cooler enters the waste heat boiler for utilization. Some of the utilized flue gas is recycled, and some are directly discharged. Most of the rest of the unused flue gas is directly discharged, causing environmental pollution Pollution

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