Device and process for generating power through efficient recovery of waste heat of sintered ores

Abstract

The invention discloses a device and a process for generating power through efficient recovery of waste heat of sintered ores and belongs to the technical field of cogeneration. The device comprises a sintered ore cooling system, a waste heat power generating system and a smoke system, wherein the sintered ore cooling system and the waste heat cycling power generating system are connected through the smoke system to form a loop. The process comprises the steps of 1), cooling of sintered ores; 2) the smoke system; and 3) waste heat power generating. The device and the process for generating power through waste heat have the advantages that discharged waste heat is used fully during cooling of sintered ores, the electric energy production is improved significantly, the power rate of the system is reduced significantly, and the energy-saving effect is significant.

Description

technical field [0001] The invention belongs to the technical field of waste heat power generation, in particular to a sinter waste heat efficient recovery power generation equipment and process. 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 using the air medium thr...

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

The short-term shutdown of the sintering machine within 30 minutes often occurs during the production process, resulting in the frequent shutdown of the waste heat power generation unit, which seriously affects the power generation and the safety and stability of the waste heat power generation system

[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

Images