Converter gas wet cooling and dedusting method

Abstract

The invention relates to a converter gas wet cooling and dedusting method which is characterized in that the method comprises the following steps: 1) evaporative cooling: flue gas at the temperature of about 900 DEG C is cooled by evaporation; the water droplets of the flue gas are cooled by spraying and then mixed with hot flue gas, so that the temperature of the flue gas is further reduced to 70-80 DEG C after the evaporative cooling; 2) spray dedusting: the sprayed water droplets of the cooled flue gas are used for capturing dust particles, and the captured dust particles are discharged from a pollutant discharge outlet; the gas after the treatment of spray dedusting enters an annular scrubber; 3) dedusting by the annular scrubber: the water droplets are sprayed, so as to lead the water droplets to pass through an annular throat together with the dust-containing flue gas, then, the dust particles in the flue gas are captured when the flow rate of the flue gas is in the range of 80-120m / s. The method has the advantages that 1) the temperature and dust can be rapidly and greatly reduced; 2) power and water can be saved obviously; 3) the dedusting efficiency can be improved, so that the emission concentration of the flue gas can keep below 50mg / Nm<3>.

Description

technical field [0001] The invention relates to a cooling and dust removal treatment method for metallurgical furnace flue gas, in particular to a wet cooling and dust removal method for converter gas. Background technique [0002] The flue gas produced by the steelmaking converter during the smelting process has a high concentration of dust and carbon monoxide, but it can be recycled after cooling and dust removal, which not only protects the environment, but also avoids energy waste. At present, domestic steelmaking converter flue gas purification systems mostly use two-stage venturi tube dust collectors to cool down and remove dust from the flue gas. [0003] Among them, the cooling and dedusting principle of the first-stage venturi tube is: when the flue gas passes through the throat part of the venturi tube, the speed reaches about 60 m / s, which forms a large contrast with the cooling water sprayed into the throat part. speed, so that the cooling water is atomized; the...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a converter gas wet cooling and dedusting method to solve the disadvantages of the existing method, such as large power consumption, high water consumption, many equipment units, easy blockage of RD throat, and small adjustment range of throat flow area; The method of the invention can not only quickly and greatly reduce the temperature, significantly save power and water consumption, but also improve dust removal efficiency and ensure that the emission concentration of flue gas is 50mg / Nm 3 Below, reach the international advanced level

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