Combined dust removal device and method for nickel-iron alloy smelting plant

Abstract

The invention discloses a combined dust removal device and method for a nickel-iron alloy smelting plant. The method comprises the following steps that a main flue is divided into two branch flues which are respectively connected with a submerged arc furnace and a rotary kiln; a cyclone dust collector is connected with the main flue, is a two-stage cyclone dust collector and is used for separating and filtering flue gas twice; a centrifugal fan is used for feeding the flue gas into a wet dust collector, carrying out water bath washing and spray washing on the flue gas, and discharging the demisted clean air into the atmosphere; a wet dust collector comprises a water bath area, a spray washing area and a demisting water collecting area which are sequentially arranged from bottom to top, an automatic overflow port is formed in the side wall of the water bath area, and a water inlet is formed in the side wall of the spray washing area; a buffer pool provides circulating water for the circulating pump, a circulating pump conveys the circulating water to the wet dust collector through the water inlet, a circulating water returns to the buffer pool through the automatic overflow port, and reciprocating circulation is achieved. The method can be used for treating high-temperature flue gas of a rotary kiln and a submerged arc furnace in a ferronickel smelting plant, and is short in process, low in investment cost, good in dust removal effect and high in efficiency.

Description

technical field [0001] The invention relates to an environmental protection dust removal technology, in particular to a combined dust removal device and method used in nickel-iron alloy smelters. Background technique [0002] In the industrial production process of using laterite nickel ore to smelt ferroalloy, a large amount of flue gas will be produced. The flue gas temperature at the outlet of the rotary kiln is about 300°C, and the temperature of the flue gas in the submerged arc furnace is about 400°C. These high-temperature flue gases contain a lot of toxic and harmful Dust must be treated before it can be discharged. Since the current high-temperature dust collection bag can reach a maximum temperature resistance of 280°C, it cannot be used directly. Most of the industry applications are to first enter the high-temperature flue gas into the air cooler for cooling, and then connect it to the bag filter for purification. [0003] For nickel-iron alloy smelters, the hig...

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Problems solved by technology

[0003] For nickel-iron alloy smelters, the high-temperature flue gas emissions from rotary kilns and submerged arc furnaces are both 7×10 4 N m 3 About / h, multiple air coolers and bag filters are needed, which requires a lot of capital costs and increases a lot of floor space

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