A sintered bellows exhaust gas waste heat recycling device and method

Abstract

The invention relates to a sintering air bellow exhausting gas waste heat circulating utilization device and method. The device comprises a sintering machine trolley, a big gas flue and a chimney, wherein air bellows distributed on the sintering machine trolley side by side are connected with the big gas flue arranged below the air bellows; the big gas flue is connected with the chimney; three-way switching valves are mounted on a smoke pipe positioned between the air bellows, positioned between a nose section and a tail section, of the sintering machine trolley, and the big gas flue; the other passages of the three-way switching valves are connected with smoke collectors; the smoke collectors are connected with a smoke mixing pipeline through pipelines; dust settling chambers are mounted inside the smoke mixing pipeline; the smoke mixing pipeline passes through a two-stage integrated dust collection unit and a circulating fan through a backflow smoke pipe and is connected with a sealing cover arranged in the middle of the upper end of the sintering machine trolley. According to the invention, waste gas with high oxygen content in the nose section and waste gas with high temperature in the tail section are mixed and enter a sintering machine, so that the heat energy of the waste gas is effectively utilized; repeated dust collection, desulfuration and cooling technologies are adopted, so that the emission of pollutants in the waste gas can be reduced.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting equipment, and in particular relates to a sintering bellows exhaust gas waste heat recycling device and method. Background technique [0002] The iron ore sintering production process of iron and steel enterprises will produce a large amount of waste gas, which contains a variety of complex environmental pollutants, such as dust, SO2, NOX, heavy metals (such as Cd, Hg, As, Pb, etc.), HCl, HF, volatile persistent organic pollutants (VOC), polycyclic aromatic hydrocarbons (PAHs), dioxin-like persistent organic pollutants (POPs), etc. The country's new "Emission Standards of Air Pollutants for the Iron and Steel Industry" has specified the latest emission control standards for pollutants such as SO2, NOX and dioxins in sintering flue gas. [0003] The energy consumption of the sintering process accounts for about 10% of the total energy consumption of iron and steel production. Realizing energ...

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Problems solved by technology

Among them, the temperature of the flue gas is 100-200 °C, and the temperature of the wind box at the end of the sintering production reaches above 200 °C. At present, the commonly used waste gas utilization methods are mostly used for power generation or ignition of steam boilers. The utilization rate of the waste gas heat is still not high for these methods. High, the flow rate and utilization rate of exhaust gas cannot be adjusted according to industrial and mining parameters, and the most important thing is that the content of harmful substances in exhaust gas cannot be reduced while using heat

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