Gas dust collector

Abstract

The invention discloses a gas dust collector, wherein the upper cone of a shell is provided with a gas inlet and a water inlet pipe, the end of the water inlet pipe is connected with a nozzle and then inserted in the upper part of a Venturi tube; the lower part of the Venturi tube is provided with a vortex plate; the lower outlet end of the Venturi tube is connected with a dust-mud trap; the upper part of the dust-mud trap is provided with a clean gas discharge pipe, the bottom of the dust-mud trap is provided with an inclined mud discharge pipe which extends outside the shell; the bottom of the shell is provided with a dust discharge hole, the shell is internally provided with an air flow drainage instrument; the air flow drainage instrument comprises a rotatable barrel; the inner wall of the barrel is provided with a spiral drainage body; the upper part of the Venturi tube is arranged in the barrel; the upper end of the spiral drainage body is lower than the inlet of the Venturi tube; and the top of the shell is provided with a driving motor which drives the barrel to rotate. By adopting the gas dust collector, the coal gas which is through gravitational dust collection can enter the Venturi tube in a high speed to be mixed with water effciently, thus the efficiency of dust collection is easy to increase.

Description

technical field [0001] The invention relates to a gas dust collector. Background technique [0002] Blast furnace ironmaking produces about 1800-2000Nm per ton of pig iron 3 gas, which contains 20-24% CO and 2% H 2 , calorific value is about 3500-3800kJ / m 3 , is the main fuel for blast furnace hot blast stoves, coke ovens, heating furnaces, power generation boilers, etc. in iron and steel plants. The dust content of gas discharged from the top of the blast furnace is 40-100g / m 3 , general industrial burners require dust content less than 5-10mg / m 3 , so the blast furnace gas must be dedusted to meet the requirements of use. [0003] Common blast furnace gas dedusting system devices and arrangements include: ①The former Soviet Union used more gravity gas dust collectors-scrubbing towers-venturi tubes-electrostatic precipitators; - Venturi tube - electrostatic precipitator; ③ Japan's Nippon Steel and China's Baosteel used gravity gas dust collector - 1-stage Venturi tube ...

AI Technical Summary

Problems solved by technology

However, practice has proved that there are still some problems in this system. The main disadvantage is that the gravity gas dust collector and the wet gas dust collector are set separately, and the gas that has been coarsely dedusted by the gravity gas dust collector must be discharged from it, and then enter the wet gas dust collector. Fine dust removal with a device, long process, large floor area, complex equipment, and large investment

Although the Chinese patent literature with the publication number CN1508269A discloses a dry-wet integrated gas dust collector, this gas dust collector first carries out gravity coarse dust removal to the gas, and then carries out water-gas mixing to the gas through the Venturi tube to further remove all impurities in the gas. However, before the water-gas mixing, the gas enters the Venturi tube through its own diffusion, therefore, the diffusion speed of itself is very low, and the efficiency of the water-gas mixing will be greatly reduced, and , when the pressure in the shell does not reach equilibrium, the gas that has not been mixed with water and gas will stay in the shell, causing it to be discharged directly without being treated. Therefore, the treatment efficiency of this gas dust collector needs to be improved

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