A method for improving sintering waste heat efficiency in sintering waste heat power generation

Abstract

The invention provides a technical proposal of a method that improves the efficiency of sintering afterheat in the electricity generation with the sintering afterheat, which is characterized in that a fabric device of a sintering belt cooler adopts a storing structure, and a gap between the blanking chute of a sintering machine and the belt cooler is narrowed, thus leading the material layers of high-temperature sintering ore on the belt cooler to have even thickness and trapezoid cross sections and to be kept continuous; a petticoat pipe in the upper part of the belt cooler is made of refractory materials and adopts the structure that is favorable for the flowing and the mixing of high-temperature air flow in the petticoat pipe, and an intercepting valve is arranged on a chimney that is connected with the petticoat pipe; the gap between the petticoat pipe and the belt cooler is kept with the smallest distance; part of smoke gas that is discharged from an afterheat stove is pressurized by a draft fan, transmitted into a cooling wind system in the high-temperature sintering ore part of the belt cooler and recirculated; the dual pressure afterheat stove is adopted to improve the utilization rate of the afterheat energy, and a steam-turbine electricity generator with steam supplementation and condensation is adopted to increase generated electricity energy.

Description

Technical field: [0001] The invention relates to a method for utilizing sintering waste heat in the iron and steel industry, in particular to a method for improving sintering waste heat efficiency in sintering waste heat power generation. Background technique: [0002] In the iron and steel industry, in order to improve the utilization of energy and reduce the energy consumption coefficient per ton of steel, using sintering waste heat to generate electricity is one of the positive measures. The exhausted flue gas is sent to a traditional heat tube boiler to produce low-pressure saturated steam, which cannot be used for power generation. The reason is that the high-temperature sinter discharged from the sintering machine is not continuously discharged, and the thickness of the material layer is not uniform. Therefore, the temperature of the flue gas after cooling the sinter varies greatly. The gap between the belt cooler and the belt cooler is large, and cold air can easily ...

AI Technical Summary

Problems solved by technology

[0002] In the iron and steel industry, in order to improve the utilization of energy and reduce the energy consumption coefficient per ton of steel, using sintering waste heat to generate electricity is one of the positive measures. The exhausted flue gas is sent to a traditional heat tube boiler to produce low-pressure saturated steam, which cannot be used for power generation

The reason is that the high-temperature sinter discharged from the sintering machine is not continuously discharged, and the thickness of the material layer is not uniform. Therefore, the temperature of the flue gas after cooling the sinter varies greatly. The gap between the belt cooler and the belt cooler is large, and cold air can easily enter, which reduces the temperature of the flue gas, making it difficult to use the sintering waste heat for power generation. This is the deficiency of the existing technology