Method and device for recovering after heat of grates of drying grate

Abstract

The invention discloses a method and a device for recovering the after heat of grates of a drying grate and relates to the equipment manufacturing of metallurgical industry. The method and the device are mainly used for a drying grate-rotary kiln-circle-cooling machine process to produce spheric agglomeration. The method adopts the technical scheme that a grate back stroke section on the lower part of the drying grate is additionally provided with at least three grate after heat recovering sections sequentially comprising an after heat recovering section I, an after heat recovering section II, an after heat recovering section III and the like which correspond to the moving direction of the grates, wherein each after heat recovering section is provided with a wind cover above the grate to be cooled and a wind box below the grate so as to ensure that low-temperature hot wind sequentially passes through the wind box and the wind cover from the higher after heat covering section to the lower after heat covering section until reaching the after heat recovering section I, namely, the low-temperature hot wind is subjected to at least three times of heat exchange with the grates; the grates are cooled sequentially; the temperature of the hot wind is raised gradually; and finally the high-temperature hot wind is discharged so as to achieve the high-efficiency recovery of the after heat of the grates, reduce ineffective release of heat during the cooling of the grates, improve the heat energy utilization rate and save the energy resource.

Description

technical field [0001] The invention relates to a method and a device for recovering waste heat from a grate bed of a grate, belonging to the technical field of equipment manufacturing in the metallurgical industry, and is mainly used in the production of pellets by a grate-rotary kiln-ring cooler process. Background technique [0002] Energy is an important material basis for people to produce and survive. With the development of society, energy consumption continues to increase, and people are increasingly aware of the importance of energy issues. In my country's iron and steel smelting industry, energy consumption is high and pollution is high, which is not conducive to my country's sustainable development. The implementation of new technologies for energy conservation and environmental protection is the goal pursued by our country. It is very important for my country to achieve the overall goal of energy conservation and emission reduction in the "Eleventh Five-Year Plan"...

AI Technical Summary

Problems solved by technology

[0005] Without changing the structure of the grate plate, the present invention proposes a method and device for recovering waste heat from the grate bed of the grate machine, which reduces the ineffective release of heat in the cooling of the grate bed, and overcomes the fact that the existing grate machine does not use the waste heat of the grate bed and other devices Low efficiency of waste heat utilization method and other defects, to achieve the purpose of saving energy

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