Dust catcher for blast furnace gas

Abstract

This dust catcher for blast furnace gas (10) has: a settling chamber (12) which is formed inside a vessel (11); an inlet pipe (13) for introducing a blast furnace gas into the settling chamber (12); a distribution chamber (15) which is provided above the settling chamber (12) and communicates with the upper part of the settling chamber (12); and multiple cyclones (16) which are arranged around the settling chamber (12) and have an air intake port (163) communicating with the inside of the distribution chamber (15).

Description

technical field [0001] The invention relates to a method and equipment for purifying blast furnace gas produced in a blast furnace, in particular to a dust collector for blast furnace gas. Background technique [0002] Since the blast furnace gas discharged from the top of the blast furnace is in a state of high temperature and high pressure, the energy (heat and pressure) of the gas is usually recovered by the top pressure recovery turbine power generation device (TRT). However, blast furnace gas cannot be directly used for TRT because it contains dust and the like scattered from raw materials charged in the blast furnace. Therefore, the exhaust gas is treated by the gas purification system equipped with the blast furnace to make it purified. The blast furnace gas processed by TRT is used as fuel gas for heating furnaces, boilers, etc. in ironworks. [0003] Generally speaking, coarse dust is removed by a dust collector as a primary dust collector (a dust collector that r...

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Problems solved by technology

[0008] The dust collector in the above-mentioned patent document 2 can obtain higher dust collection performance by utilizing the settling chamber to collect dust and utilizing the cyclone dust collector to collect dust, but it will cause the following problems due to the following reasons: The recovery rate of coarse-grained dust is reduced by gravity sedimentation, and a part of coarse-grained dust is mixed with medium-grained dust and fine-grained dust to be recovered.

However, as shown in Patent Document 2, if the suction port of the cyclone dust collector is directly connected to the settling chamber, the high-speed blast furnace gas that is about to be sucked into the cyclone dust collector may drive the powder that settles near the suction port due to gravity. And make it sucked into the cyclone dust collector, which hinders the function of separating coarse dust by gravity settling

[0011] Third, in Patent Document 2, the cyclone dust collector is installed in the settling chamber, which may reduce the cross-sectional area of ​​the settling chamber, increase the velocity of the upwelling flow of blast furnace gas, and disturb the flow of blast furnace gas in the settling chamber

Therefore, it may also lead to the separation performance of coarse dust by gravity settling in the settling chamber.

[0012] Also, in Patent Document 2, the cyclone dust collector is arranged inside the dust collector, so that the air inlet of the cyclone dust collector will be located at the middle height position of the settling chamber, limiting the height of the cyclone dust collector itself

Since the cyclone is limited like this, there is also a possibility that the cyclone will not obtain sufficient dust collection performance

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