SU1274744A1 - Method of cooling and cleaning blast-furnace gas - Google Patents

Abstract

The invention relates to methods for cooling and cleaning blast furnace gas from dust, used in a series of metallurgy, and allowing water consumption to be reduced. Hot dusty blast furnace gas is fed to a dry compactor in the form of a chamber of gravitational-inertial deposition, then to a fluidized bed cooler with wet coal concentrate or granulated blast-furnace slag, then to a wet dust separation s Venturi tube, a droplet separator and a choke. The residual dust content is 5 mg / nm, the temperature is up to. Water consumption in wet dust deposition 3.91-4.68 kg / nm gas. (Ls

Description

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The invention relates to methods for cleaning blast furnace gas from dust and cooling it, and may find application in the iron and steel industry.

The purpose of the invention is. reduced water consumption.

Example 1. A blast furnace gas at a pressure of 1.9 kg / cm, temperature and dust content of 50 g / nm is supplied at a flow rate of 200 thousand to a dry dust collector in the form of a gravitational-inertial deposition chamber, in which the dust content of the gas decreases to 10 g / nm, and temperature - up to 300 ° C. Then the gas is fed to the fluidized bed cooler under the grate, into which the coal concentrate of the fraction is loaded with a 1–8 mm moisture content of 11% at a rate of 117 t / h. At the outlet of the cooler, the coal concentrate has a humidity of 2% and a temperature of 120 ° C, and the blast furnace gas has a temperature and pressure of 1.84 kg / cm with a constant dust content. Next, the blast furnace gas is directed to the Venturi tube, the droplet separator to the throttle device, where the gas is reduced to 5 mg / nm, the temperature is up to, the pressure to 0.06 kg / cm. At the same time, the water consumption in the wet stage of cleaning is 3.91 kg / im5, without coal concentrate - 5.16 kg / nm

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P n. And m e p 2. With the initial data of example 1 using granulated blast furnace slag with a flow rate of 62.3 t / h at a humidity of 20%. At the exit of the cooler, the blast furnace slag has zero humidity and temperature 1, and the blast furnace gas has a temperature of 120 C and a pressure of 1.84 kg / cm with a constant dust content. Next, the blast furnace gas is directed to the Venturi tube, the drop catcher body and the throttle device, where the dust content of the gas is reduced to 5 mg / nm, temperature to 50 ° C, pressure to 0.06 kg / cm. At the same time, the water consumption in the wet cleaning is 4.68 kg / nm.

Dried coal concentrate is sent to coke ovens, and granulated slag to cement plants.

Claims (1)

Invention Formula A method of cooling and purifying blast furnace gas, including the stages of dry and wet dust separation and contact cooling of the gas with a wet solid heat carrier prior to the wet separation stage, characterized in that, in order to reduce water consumption, coal concentrate or granulated domain donkey is used as a solid heat carrier.