Sintering cooler flue gas waste heat utilization system and sintering cooler

Abstract

The invention provides a smoke waste heat utilization system of a sintering cooler and the sintering cooler provided with the smoke waste heat utilization system. The sintering cooler comprises a high-temperature cooling section, an intermediate-temperature cooling section and a low-temperature cooling section. The intermediate-temperature cooling section comprises a first intermediate-temperature cooling area, a second intermediate-temperature cooling area, a third intermediate-temperature cooling area and a fourth intermediate-temperature cooling area. The low-temperature cooling section comprises a first low-temperature cooling area and a second low-temperature cooling area. Air-induced covers are arranged above all the cooling areas. The air-induced cover of the high-temperature cooling section communicates with a high-temperature section inlet of a waste heat boiler through a first smoke pipeline. The air-induced covers of the intermediate-temperature cooling section communicate with a low-temperature section inlet of the waste heat boiler through a second smoke pipeline. A third smoke pipeline is in branch connection to the second smoke pipeline. The third smoke pipeline is connected with a low-temperature waste heat utilization mechanism. By the adoption of the smoke waste heat utilization system of the sintering cooler and the sintering cooler provided with the smoke waste heat utilization system, gradient utilization of the smoke energy of the sintering cooler can be achieved, the smoke, entering the waste heat boiler, of the intermediate-temperature cooling section through the third smoke pipeline can be adjusted, and it is guaranteed that the heat entering the waste heat boiler is relatively stable.

Description

technical field [0001] The invention belongs to the technical field of sintering, and in particular relates to a sintering cooler flue gas waste heat utilization system and a sintering cooler equipped with the flue gas waste heat utilization system. Background technique [0002] At present, the waste heat recovery of the sinter cooler is mainly to recover the waste heat of the flue gas above 200°C, which is used to generate steam for power generation; since the flue gas temperature in the high temperature section of the sinter cooler is only 300-400°C, the quality of the steam generated by the waste heat generator set low, leading to low power generation efficiency. However, the flue gas below 200 °C is not used or directly recovered, such as hot air sintering, as combustion air for sintering igniter, etc. The waste heat utilization rate of machine flue gas is low. [0003] At the same time, due to the influence of the sintering operation state of the waste heat power gene...

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Problems solved by technology

[0002] At present, the waste heat recovery of the sinter cooler is mainly to recover the waste heat of the flue gas above 200°C, which is used to generate steam for power generation; since the flue gas temperature in the high temperature section of the sinter cooler is only 300-400°C, the quality of the steam generated by the waste heat generator set low, leading to low power generation efficiency

However, the flue gas below 200 °C is not used or directly recovered, such as hot air sintering, as combustion air for sintering igniter, etc. The waste heat utilization rate of machine flue gas is low

[0003] At the same time, due to the influence of the sintering operation state of the waste heat power generation system of the sintering cooler, the stability of the waste heat power generation unit is poor, and the annual utilization hours are short, about 5000 hours

The main reasons for the unstable operation of the waste heat power generation system of the sinter cooler: First, the particle size of the sinter varies with the amount of sintered carbon, the moisture in the granulation process, and the particle size of the sinter powder, which causes the cooling air volume of the cooler to change, and the waste heat utilization system The input energy fluctuates; the second is that the temperature of the sinter entering the sinter cooler is affected by the sintering operation state. When the sintering process is excessively under-burned or over-sintered, the temperature of the sinter entering the cooler is low; the third is the actual operation process of sintering Due to some reasons, the medium sintering machine often shuts down for a short time, causing the heat input of the sintering cooler to be interrupted, and the generator set is forced to stop

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