Converter deep waste heat recovery boiler

Abstract

The invention discloses a converter deep waste heat recovery boiler. The boiler comprises an upper collecting box, a lower collecting box, a boiler outer wall and a boiler flue, wherein the boiler outer wall is isolated and connected with the upper collecting box and the lower collecting box; the boiler flue with a smoke inlet and a smoke outlet is formed among the upper collecting box, the lowercollecting box and the boiler outer wall; the boiler outer wall is of a cylindrical structure, and is composed of a plurality of outer wall pipes which are vertically arranged and a plurality of flatsteel bars, and the outer wall pipes are vertically communicated between the upper collecting box and the lower collecting box, and are evenly distributed at intervals along a circle, and a flat steelbar is hemetically welded between every two adjacent outer wall pipes; the boiler flue is internally provided with convection heating surface tubes, and the end parts of the convection heating surface tubes hemetically penetrate out of the boiler outer wall, and is hemetically communicated with the outer wall pipes. The converter deep waste heat recovery boiler has strong anti-explosion performance and good sealing performance.

Description

technical field [0001] The invention relates to the technical field of boilers, especially waste heat boilers, in particular to a converter deep waste heat recovery boiler. Background technique [0002] Converter steelmaking is the main steelmaking process in the world today. 80% of the world's steel output is produced by converters. There are about 900 converters in my country's key iron and steel enterprises. The converter will produce a large amount of furnace gas with a temperature as high as 1600°C in the steelmaking process. On the one hand, these furnace gases contain a large amount of sensible heat, and on the other hand, the composition contains CO with a concentration of up to 80%, which also contains a large amount of chemical heat. Generally, the furnace gas recovery process is adopted. The existing furnace gas recovery processes are mainly divided into two categories: vaporization cooling + wet dedusting process (abbreviated as OG method); vaporization cooling ...

AI Technical Summary

Problems solved by technology

[0006] 1) The sensible heat of the high-temperature furnace gas at 800-1000°C is not recovered, and high-quality waste heat resources are wasted;

[0007] 2) In the process of cooling and dust removal, a large amount of water and electricity are consumed;

[0008] 3) Due to the use of water spraying to cool down, the water content of the converter gas increases, resulting in a decrease in the low-level calorific value of the converter gas, and the comprehensive utilization is affected;

[0009] 4) Due to the increase in water content of the dust in the furnace gas, even after washing with water, its characteristics change, and the original high-priced resource becomes waste, resulting in a huge waste of resources

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