Metallurgical furnace dedusting waste heat recovery machine and method

Abstract

The invention relates to a metallurgical furnace dedusting waste heat recovery machine and a metallurgical furnace dedusting waste heat recovery method. A technical scheme is that: the metallurgical furnace dedusting waste heat recovery machine comprises high-temperature smoke generating equipment, a draught fan and an exhaust cylinder which are connected with one another sequentially through pipelines. A waste heat utilization facility is placed behind a dust catcher, and the dust content of heat source smoke is low and is not taken into consideration when the equipment is designed and manufactured, so the space between heat exchange core unit fins can be designed to be small and dust-unloading, dust-cleaning and dust-conveying facilities are unnecessary; and the volume of the waste heat utilization facility is reduced, so the maintenance quantity of the waste heat utilization facility is reduced and the service life of the waste heat utilization facility is prolonged.

Description

Technical field [0001] The invention belongs to the field of dust removal waste heat recovery of metallurgical furnaces, and relates to dust removal and waste heat recovery of metallurgical furnace flue gas. Background technique [0002] Metallurgical furnace (electric furnace, converter, rotary hearth furnace) steelmaking flue gas temperature is very high, after being captured, the temperature entering the pipeline is generally around 1500 °C, and the dust concentration is up to 25g / Nm 3 , The ash less than 10um accounts for more than 70% of the total amount of dust, the amount of dust is large, and it is sticky and fine. At present, the method of heat exchange and cooling is usually adopted first (heat exchange and cooling methods include: mechanical cooler heat exchange, spray cooling heat exchange, waste heat boiler heat exchange, etc.) and then dust removal method. There are many disadvantages in the method of heat exchange and cooling before dust removal: [0003] 1....

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Problems solved by technology

[0003] 1. Dust removal after heat exchange of the mechanical cooler: the cooling effect is poor, the temperature of the imported flue gas should not be greater than 500°C, the cooling range is limited, and the tube wall of the mechanical cooler is easy to be blocked with ash, resulting in burning cloth bags and the system cannot operate normally

[0004] 2. Dust removal after spray cooling and heat exchange: increasing the water content in the flue gas will not only harden the bag, but also easily cause water and dust to bond, resulting in blockage of system equipment

[0005] 3. Dust removal after heat exchange of the waste heat boiler: Since the flue gas contains a large amount of dust, the sticky and fine dust will accumulate dust and blockage even on the heat pipe elements of the light pipe. Ash and clogging are more serious. At the same time, in order to prevent ash formation, the fin spacing of heat exchange core components in waste heat utilization facilities is large, which not only affects heat exchange efficiency, but also causes insufficient steam production of waste heat boilers. The unstable operation of the system caused the smelting production to be unable to proceed normally and was forced to stop production for maintenance

[0006] Due to the above shortcomings, many soot blowing methods are used in the project: such as shock wave soot blowing, steam soot blowing, falling shot cleaning, etc., but because the dust is fine and sticky, and the amount of dust is large, 30kg of dust will be generated for every ton of steel produced. , these dust removal methods have little effect and cannot fundamentally solve the problem of dust accumulation and blockage

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