Nitrogen protection anti-explosion device and method of converter flue gas waste heat boiler

Abstract

The invention relates to a nitrogen protection anti-explosion device and method of a converter flue gas waste heat boiler, and belongs to the technical field of converter flue gas waste heat boilers.According to the technical scheme, one set of outer upper support (20) and outer lower support (21) are at least arranged on the circumference of the outer side of a waste heat boiler outer wall (2),a relatively closed space is formed between the waste heat boiler outer wall (2), an outer sealing layer (19), the outer upper support (20) and the outer lower support (21), and the space is filled with a protection layer insulation material (18); and nitrogen branch pipes (23) penetrate through the outer sealing layer (19) to enter protection layers. The device and method have the beneficial effects that air is prevented from entering the converter flue gas waste heat boiler, an alarm can be given in time for outer wall perforating of the converter flue gas waste heat boiler, the air leakingphenomenon of the converter flue gas waste heat boiler can be found in time, and the hidden danger of exploding and gas leaking can be eliminated. Severe influence is prevented from being generated onconverter steel making, and huge safety production accidents are eradicated.

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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