Novel efficient sinter sensible heat recovery technology

Abstract

The invention discloses a novel efficient sinter sensible heat recovery technology. The novel efficient sinter sensible heat recovery technology comprises a roller type cooler, a waste heat boiler, a cyclone dust remover, a multi-pipe type dust remover and a pre-economizer. After high-temperature sinter with the temperature of 750 DEG C to 850 DEG C enters the roller type cooler, high-temperature smoke with the temperature of 650 DEG C to 750 DEG C enters the waste heat boiler after passing the cyclone dust remover; the waste heat boiler absorbs the sensible heat of the high-temperature smoke and generates overheat steam of 4.5 MPa and 450 DEG C; the temperature of the smoke at the outlet of the boiler is reduced to 160 DEG C to 180 DEG C, secondary dust removing is carried out through the multi-pipe type dust remover, and then the smoke enters the roller type cooler. The high-temperature sinter is cooled in the roller type cooler, the high-temperature hot air is generated and conveyed to the waste heat boiler, and the overheat steam is generated for power generation. Meanwhile, a full-closed form is adopted in a cooling circulation system, and the quality of recycled waste heat is improved. The two-level dust removing technology mode is adopted, the recycling rate of mineral powder is increased, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of physical heat (sensible heat) of solid high-temperature materials, in particular to a novel high-efficiency sinter sensible heat recovery process. Background technique [0002] In iron and steel enterprises, the energy consumption of the sintering process is second only to ironmaking, and the waste heat of sintering accounts for about 10-20% of the energy consumption of the sintering process, ranking second, generally accounting for about 10% of the total energy consumption of iron and steel enterprises. Although my country's sintering energy consumption has declined in recent years, the average energy consumption of sintering processes in key enterprises is 66.42kgce / t, but it is still higher than the level of advanced countries in the world by about 30% (20kgce / t). Therefore, the efficient use of sintering waste heat resources The utilization of energy saving and consumption r...

AI Technical Summary

Problems solved by technology

[0006] 1. The heat exchange between the mineral material and the cooling air is not sufficient. The heat exchange between the cooling air and the sintered ore material depends on the penetrating ability of the fan to the material layer. The thick material layer is generally cooled by blasting, and the cooling air Only sufficient air pressure and air volume can achieve a good cooling effect, resulting in high power consumption of the fan; the induced air cooling method adopts the form of a thin material layer, and the cooling air directly passes through the material layer, and the heat exchange time is short, which cannot achieve a good cooling effect. The heat exchange effect seriously affects the quality and quantity of heat

[0007] 2. The structure of the belt cooler or ring cooler is poorly sealed, and the air leakage is serious, so that the heat extraction quality is not high

[0008] 3. The environmental pollution is serious. After the hot air from the ring cooler enters the waste heat boiler for heat exchange, most of the flue gas is discharged into the atmosphere through the chimney

[0009] 4. Large cooling air volume per ton of mineral material, high fan power consumption

[0010] 5. The heat extraction section of the ring cooler is small, and a large amount of waste heat resources are wasted

Due to the low energy quality of sinter waste heat recovery, in order to effectively recover and utilize the most possible heat energy, most of the existing sinter waste heat boilers in China currently use dual-pressure technology, which produces medium-pressure superheated steam for steam turbine power generation, and produces part of low-pressure steam for boiler feed water. It is used for deoxidation, or incorporated into the pipe network for production, preheating sintering mixture and heating, etc., but the dual-pressure waste heat boiler adopts a double steam-water system, and the amount of steel used in the boiler is also large, which makes its control system more complicated. High-quality steam The evaporation capacity is small, the thermal efficiency is low, and it cannot meet the growing requirements of the large-scale sintering device

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