An explosion-proof device and method for nitrogen protection of converter flue gas waste heat boiler

Abstract

The invention relates to a nitrogen protection explosion-proof device and method for a converter flue gas waste heat boiler, and belongs to the technical field of converter flue gas waste heat boiler. The technical solution is: at least one set of external upper support (20) and external lower support (21) are arranged on the outer circumference of the waste heat boiler outer wall (2), the outer wall of the waste heat boiler (2), the outer sealing layer (19), the outer upper support A relatively closed space is formed between (20) and the outer lower bracket (21), which is filled with protective layer insulation material (18); the nitrogen branch pipe (23) enters the protective layer through the outer sealing layer (19). The invention has beneficial effects: preventing air from entering the converter flue gas waste heat boiler, and timely alarming the perforation of the outer wall of the converter flue gas waste heat boiler, discovering air leakage from the converter flue gas waste heat boiler in time, and eliminating hidden dangers of explosion and gas leakage. Avoid serious impact on converter steelmaking, and prevent major safety production accidents.

Description

technical field [0001] The invention relates to a nitrogen protection explosion-proof device and method for a converter flue gas waste heat boiler, and belongs to the technical field of converter flue gas waste heat boiler. Background technique [0002] At present, water spraying and atomization cooling converter high-temperature flue gas treatment process (temperature between 1000~800°C) is widely used at home and abroad, which consumes a lot of precious water resources, and the resulting converter flue gas recovery process is complicated and the equipment failure rate is high. High, high maintenance costs, excessive emissions, resulting in waste of converter flue gas heat and converter ash (very good industrial raw materials). In order to solve the above problems, the converter flue gas waste heat boiler is used to recover the heat of the high temperature flue gas of the converter by the pure dry method. The waste heat boiler operates under negative pressure at variable t...

AI Technical Summary

Problems solved by technology

[0002] At present, water spraying and atomization cooling converter high-temperature flue gas treatment process (temperature between 1000~800°C) is widely used at home and abroad, which consumes a lot of precious water resources, and the resulting converter flue gas recovery process is complicated and the equipment failure rate is high. High, maintenance cost is high, emissions exceed the standard, resulting in waste of converter flue gas heat energy and converter ash (very good industrial raw materials)

In order to solve the above problems, the converter flue gas waste heat boiler is used to recover the heat of the high temperature flue gas of the converter by the pure dry method. The waste heat boiler operates under negative pressure at variable temperature (1000°C to 170°C), and the dust content of converter flue gas is extremely high, about 150-200mg / Nm 3 , the waste heat boiler is affected by the alternating stress and the erosion of soot particles for a long time, which may easily cause cracks or perforations in the outer wall, and the outside air can easily enter the waste heat boiler. Or the risk of explosion; in addition, during the use of the converter flue gas waste heat boiler, it is in the working state of negative pressure and high temperature (1000°C--170°C) for a long time, and the welded joints are prone to cracks and leaks, and the sealing performance of the equipment is reduced. If the oxygen leaks into the waste heat boiler, an explosion will occur, which will have a serious impact on the production order of converter steelmaking, and at the same time, there will be a risk of major safety production accidents

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