Recovery device for sensible heat of powdery solid

Abstract

The invention discloses a recovery device for the sensible heat of powdery solid. The device comprises a coal economizer, evaporators, pipelines, a material inlet and a material outlet. The evaporators are vertically connected in turn above the coal economizer through the pipelines. A top opening of the top-layer evaporator is the material inlet. A bottom opening of the bottom-layer coal economizer is the material outlet. A support frame is covered around the outside of the coal economizer and the evaporators. The coal economizer and evaporator of each layer are welded to the support frame. The coal economizer and the evaporator have the same structure, and consist of an inner tube and an outer tube respectively. The coaxial inner tube is arranged in the outer tube. The inner and outer tubes are welded and formed through an upper end enclosure and a lower end enclosure to form an annular tube. One end of a heat pipe is inserted into an interlayer between the inner and outer tubes, andthe other end of the heat pipe is positioned in the inner tube. The lower ends of the outer tubes of the coal economizer and the evaporator are communicated with a water inlet pipe, and the upper ends of the outer tubes of the coal economizer and the evaporator are communicated with a water outlet pipe. The device has the advantages of rational structure, convenience of use, heat exchange uniformity and stability, safety, reliability and the like.

Description

technical field [0001] The invention relates to a waste heat recovery device, in particular to a device for recovering powdery solids in the smelting industry. Background technique [0002] It is known that in the smelting industry, a large amount of waste heat resources will be generated, such as the waste heat resources generated in the magnesia and alumina production industries. This kind of waste heat is mainly composed of two parts: 1. Calcined waste gas from kilns; 2. Sensible heat from the powdery solid product produced after calcination. At present, the use of waste heat is only to introduce the calcination waste gas into the waste heat boiler to generate steam, and then use the steam to do work; but there is no better way to use the sensible heat of the calcined product, usually by air cooling. The heat of the cooling gas is reused, so that the cooling efficiency is low and a large amount of high-temperature resources are wasted. [0003] At present, in the ex...

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Problems solved by technology

There are certain deficiencies in this method: first, the cross-section of the material inlet is smaller than the cross-section of the heat exchange fluid, so that when the material enters, it is easy to be unevenly distributed, resulting in that the heating surface cannot be fully utilized; second, due to the small particle size of the material, the circulation channel There is no device to promote the flow of materials, which can easily cause the materials to block in the shaft, and the boiler system cannot work normally; third, the materials are in direct contact with the heating surface. When the heating surface leaks, the entire system needs to be stopped for maintenance

Therefore, the powdery solid waste heat utilization device used in this technology is inconvenient to be popularized and used, and cannot meet the needs of industry and environmental protection

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