SU1254022A1 - Apparatus for purifying blast furnace gas - Google Patents

Description

The invention relates to the purification of gases in the ferrous metallurgy and can be used for the removal, cooling and purification of blast furnace blast furnace gases.

The purpose of the invention is to reduce metal consumption, capital and operational costs and reduce the occupied area, and gas cleaning during blast furnace gas cleaning.

FIG. 1 shows schematically a gas cleaning; in fig. 2 shows nodes I and 11 in FIG. one; in fig. 3 - horizontal gas duct with a swirler; in fig. 4 — front swirler with a series of baffle plates; in fig. 5 rear swirler with a second row of baffle plates; in fig. 6 is a view A of FIG. 5 (the angle of inclination of the plates 60); in fig. 7 is a view B in FIG. five; in fig. 8 is a view of B in FIG. four"

The blast furnace gas cleaning device consists of an irrigated gas duct 1 inclined at an angle of at least 30 to the horizontal, connected to a non-irrigated lined gas duct 2 of impure gas, and nozzles 3 (mainly involute) installed by several dries in the gas duct 1.

The duct 1 is provided with a water jacket 4, which is a hollow cylindrical shell with a perforated inner wall adjacent to the duct and installed outside the irrigated duct 1 at the place of its connection with the non-irrigable duct 2.

At the site of the water jacket, the duct I has openings 5 communicating with openings in the inner wall of the water jacket.

The advantage of the shell is that the water constantly washes the wall of the non-lined gas duct outside to provide effective cooling and heat removal. At the very beginning of the gas duct, pressurized water flows through openings with a diameter of about 10 mm. the flue to wash off the solid precipitation and prevent the formation of mechanical plugs that can lead to the exit of the flue. To precipitate dust and further cool the gas.

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nozzles (fig. 1) are installed in kefuterovannogo flue.

The diameter of the holes in the shell should be such that the total total area of the holes is 10% smaller than the cross-sectional area of the collector supplying water to the shell. This is necessary to create a head sufficient to flush out the deposits on the walls of the duct. Advantageously, the diameter of the holes in the shell should be at least 10 mm to avoid rapid evaporation of water under conditions of high gas temperatures at the beginning of the gas duct.

In order to align the holes in the shell and the gas duct, the holes are drilled from the inside of the gas duct when the shell is mounted. This is not a problem considering the large diameter of the flue (from 2 to 2.5 m).

The pressure of the blast furnace gas in the gas flue gas duct is up to 2.5 atm. To provide kinetic energy of the jet, sufficient to flush sediment, at the beginning of the non-lined gas duct, the pressure of the water supplied to the shell should be at least 4 atm (without taking into account the necessary pressure to supply water to the height of the shell from the ground surface).

In the lower part of the duct 1, there is a sludge trap 6 with a hydraulic shutter, a shlazmotvodchik 7 and sludge trap 8. After the sludge trap, the inclined duct 1 is connected to horizontally installed throttle group 9 and the flue gas 0 of clean gas in which there is a swirler 11 with two rows of fender plates 12 installed at the end of the zone of moisture capture towards each other at an angle of about 50 to the horizontal.

Optimum results in capturing droplet moisture with the least pressure loss are provided by plates, the length of which is 0.25 - 0.35 of the diameter of the flue and the width 0.5-0.6 of the diameter of the flue. The angle of inclination of the plates to the horizontal axis of the swirl is 40-60 °, the angle of inclination of the plates relative to each other in adjacent rows is 40-60. At the same time, the number of plates with one row, depending on the hydraulic resistance, is 6–9 pcs.

The duct 10 at the site of installation of the swirler is equipped with a sludge trap 13, pshamootvodchik 14 and sludge trays 15.

Water for jacket 4 provides compensation for temperature differences between the opomaeMbiM gas duct 1 and the non-irrigated gas duct 2.

The device works as follows.

Dusty blast furnace gas from a dust collector with a dust content of 5 g / m and with a temperature of 300-4.00 ° C enters through the flue 2 into the irrigated flue 1. Irrigation is carried out by injecting water through nozzles and water coming from the water jacket through communicating holes in the walls of water Noah shirt and flue, causing the gas is cooled to ZO-BS C.

Water from the dust collected in the duct 1 flows into the sludge disposal plant 7 and is removed to the sludge channel 8.

The gas from the flue duct enters the throttle group 9, where it is cleaned of dust residues, and then into the clean gas duct 10, where the droplet moisture is removed by means of a swirler, which is removed through the slurry dumper 14 to the slurry tray 15. Purified and dried gas enters the consumer.

The dust content of the gas after gas cleaning is 4 mg / m.

The invention makes it possible to reduce the metal content of the structure by eliminating the scrubber in the blast furnace gas cleaning system and replacing it with a sludge trap, as well as replacing the lined gas flue duct with an unlined irrigated gas duct, the existing drift catcher with a horizontal flue gas duct.

The cooling efficiency is achieved by jet cooling the inner wall of the non-lined gas duct with water coming from the water jacket through the holes in the duct walls, and surrounded by the outer wall with water entering the water jacket and by adjusting the amount of water supplied to the cooling.

It eliminates the need to install mechanical compensators, additional track turns for self-compensation, which reduces the metal structure, simplifies maintenance and increases the reliability of the pipeline design.

FIG. 2

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Editor L. Povhan

Compiled by V. Korobov Tehred- L. Kravchuk

Order 4689/30 Circulation 552Subscription

VNIIPI USSR State Committee

for inventions and discoveries N3035, Moscow, Zh-355, Raushsk nab, 4/5

Production and printing company, Uzhgorod, st. Project, 4

Phie.

Proof-reader I. Erdeyi

Claims (1)

DEVICE FOR CLEANING A DOMAIN-GAS, containing a lined dirty gas duct and an irrigated inclined gas duct with nozzles, a sludge trap and a water trap, a throttle group, a clean gas duct and a swirl with baffle plates, characterized in that, in order to reduce the metal consumption, capital and operating costs and reduce the occupied area, the irrigated inclined gas duct at its junction with the dirty gas duct is equipped with a water jacket mounted outside the duct in the form of a hollow cylindrical shell kits with a perforated inner wall, the holes of which are in communication with the holes made in the walls of the irrigated gas duct in the section flax, both covered by a water jacket, and the swirl set the gas duct of clean gas and equipped with a second row of baffle plates, a number of baffle plates are installed at the end of the moisture collection zone at an angle of 40-60 towards each other. 254022>