Metallurgical furnace high ash-laden gas multi-level organic Rankine cycle cogeneration method

Abstract

Provided is a metallurgical furnace high ash-laden gas multi-level organic Rankine cycle cogeneration method. The metallurgical furnace high ash-laden gas multi-level organic Rankine cycle cogeneration method is characterized in that smoke evacuation air inside a metallurgical furnace is discharged, after cold-blast air is mixed through a water-cooling sliding sleeve, the smoke evacuation air enters into a combustion settling chamber. Exhaust gas which passes through the combustion settling chamber enters a high-temperature dust remover, after the dust extraction, the exhaust gas enters into a thermal storage heat exchange chamber, a heat exchange is finished, the temperature falls to 90 DEG C, and the exhaust gas is pressed into an air exhaust funnel and discharged into the atmosphere through a main air blower. Meanwhile, an organic working medium absorbs heat in a low-pressure stage evaporator, an intermediate-pressure stage evaporator, and a high-pressure stage evaporator to form steam through a low-stage working medium pump, an intermediate-pressure stage evaporator and a high-pressure stage evaporator. A working medium steam expands and works in a multilevel organic turbine to drive a generator to generate electricity. The metallurgical furnace high ash-laden gas multi-level organic Rankine cycle cogeneration method is further characterized in that R500 is utilized as a recycling organic working medium. For the evaporator, dust is not easy to accumulate, and the evaporator is not easy to block up. The evaporator is capable of recovering the heat energy of the exhaust gas and directly conversing into the high grade electric energy, and the efficiency is improved by 10%-20% compared with a single-stage evaporation organic Rankine.

Description

Technical field [0001] The invention relates to a multi-stage organic Rankine cycle waste heat power generation method for high dust-containing flue gas of a metallurgical furnace. Specifically, it can maximize the recovery of heat energy in the flue gas and convert it into high-grade electric energy, and can improve the dust removal ability. It belongs to the dust removal method for metallurgical furnaces. technology field. Background technique [0002] The temperature of flue gas from metallurgical furnace steelmaking is very high. After being captured, the temperature entering the pipeline is generally around 1100°C, and the dust concentration reaches 35g / 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 exchan...

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Problems solved by technology

[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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