SU1284583A1 - Installation for combination cleaning of high-temperature gases - Google Patents

Abstract

The invention relates to devices used in the ferrous metallurgy and energy industry, and allows to increase the efficiency of gas cleaning, reduce energy costs and simplify the design. The device contains a high-temperature gas duct 1 connected to Venturi tubes 2, a droplet separator 3, a mixing duct 4, a gas apparatus 5 connected to the chimney 6, a pipe 7, two cyclones of a dust concentrator 8 and 9, the first of which is an inlet pipe 10 by means of the duct is connected to the duct 1, and the bypass duct 11 and the nozzle 12 are connected to the droplet separator 3, an ejector 13 is installed in the duct 1, connected to the pipe 14, the latter is connected to the dust collectors S (L

Description

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The invention relates to the purification of gases in the ferrous metallurgy and can be used in the energy industry.

The purpose of the invention is to increase the gas cleaning efficiency, reduce energy costs and simplify the design.

FIG. 1 shows a diagram of the proposed device; in fig. 2 is a diagram of the placement of the slope inside the trap.

Installation for the combined treatment of high-temperature gases Dfig. 1) consists of a flue pipe 1 of high-temperature hazardous gases, connected with Venturi pipes 2, a drift catcher 3, connected by means of a flue 4 mixed with a blowing device 5 connected to chimney 6, pipeline 7 connected to the Venturi pipes and to the catcher, serially connected main 8 and additional 9 concentrators of a pie, the inlet 10 of the first of which is connected by means of an additional gas duct of high-temperature hazardous gases to gas duct 1, a bypass gas duct It of high-temperature chi of gas connected to the outlet pipe 12 an additional hub 9 dust and mist eliminators axial region; 3, equipped with an ejector 13 of a pipeline 14 for supplying a pie-gas concentrate connected to dust extraction pipes 15 of concentrators 8 and 9 and a gas duct 1 directly in front of the Venturi pipes, shut-off and control valves 16, shell 17 of high-temperature clean gases associated with the bypass gas duct 11 and gas duct 4 mix it up

In the layout diagram of the cyclone 18 inside the drip pan 3 (Fig. 2), the curved nozzle 19 of the cyclone 18 is located

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at an angle t to the axis of the drop catcher, the cyclone 18 is provided with a double outer wall 20 of the housing 21 and a plug with a DZim branch pipe 22. The nozzles 19 and 22 are in communication with the space of a drop distributor 3 equipped with nozzles 23. The installation works in the following way.

Produced gas with a temperature of 600- 650 C from the source of dust and gas gaps through the duct 1 is fed to the hydro-mechanical cleaning (Venturi pipe 2 and the drop catcher 3), which also receives water for irrigation through pipeline 7, the temperature of the gases that have passed cleaning is reduced to 60-65 °. 3.5-5.0% of the dusty gases with a temperature of 600-650 C are taken from the flue 1 and fed through the flue to the inlet 10 ocHOBHot o of the cyclone-type dust concentrator 8. In each of the concentrators, dust is concentrated in a small volume of gas (4-6% of the amount of gas being purified). The gas and gas concentrate through the dust outlet pipes 15 enters the pipeline 14, through which the ejector 13 is continuously ejected into the venturi pipes 2. The use of serially connected high-speed concentrators 8 and 9 with the removal of the dust-gas concentrator allows achieving gas purification efficiency comparable to the efficiency hydromechanical cleaning apparatus. High temperatures and rarefaction of gases, in dust concentrators, reduce the density of gases by three or more times, and, consequently, the resistance of these devices (compared to normal conditions), which even with their multi-stage layout allows working in high-speed mode. In concentrators 8 and 9 in the field of large centrifugal forces occurs in

Intensive coagulation of dust, thus supplying the inlet of the Venturi tube through pipeline 14, the gas and gas concentrate contains a large amount of drink, which contributes to additional coagulum of dust after mixing the flows through the ducts 1 and pipeline 14. As an energy carrier in the ejector water, compressed air, steam, or a combination of them can be used. The use of an ejector placed inside the duct 1 and oriented in the direction of gas flow also makes it possible to improve the draft from the source of pypegases. scheleny. The purified high-temperature gas from the outlet nozzle 12 of the additional concentrator 9 through the free-flow duct 11 with the temperature C enters the axial region (free of droplet moisture) of the drip pan 3. Thus, the mixing of the high-temperature and low-temperature gases begins already in the volume of the droplet separator and continues in the gas duct 4 mixes. If there is a shell 17, the high-temperature gases purified in the pus concentrators are divided into two parts, one of which is fed into the axial region of the drip pan 3, and the other into the shell 17. Moving along the annular cavity, the high-temperature gases heat the wall of the duct 4, excluding the possibility condensation of water vapor on it. The gases then enter the gas duct 4 through a specially designed vacuum duct 4 and are mixed with the heated gases leaving the drift catcher. When the cyclone is placed inside the drift hood, the gases (94-96%) cleaned in it fall into the volume of the chessel cooler through the bent nozzle 19. Dust-gas concentrate containing 4-6% of the gases being cleaned, through the nozzle 22 falls into the axial region of the drift catcher. The dust contained in the concentrate is captured by water droplets coming from the nozzles 23, under the influence of centrifugal forces is thrown against the wall of the catcher and in the form of sludge flows into the hopper. The double wall 20 of the casing 21 of the cyclone 18 prevents the ingress of moisture on its walls and the cooling of the gases leaving the cyclones through the outlet 19. Removal of dust concentrate by dust removal

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The nozzle 22 occurs due to the use of a swirling flow property such as a change in the pelvic pressure along the twist radius. The share of gases discharged through the pipe 22, depends on the angle about and

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all other things being equal, it increases with increasing angle about from 0 to 90 °. Placing the cyclone inside the drift catcher, as well as placing any streamlined body along the axis of a swirling flow, does not increase the hydraulic resistance of the drift catcher.

The mixed stream, having a temperature of 85-90 ° C, enters the t-unit apparatus 5, in which, when gases are compressed from -10-15 kPa to + 100-200 Pa, there is an additional increase in gas temperature 0 to 95-100 ° C. Purified and heated gases, having a temperature of about 100 ° C and a relative humidity of 25-30%, are emitted through the chimney 6 into the atmosphere.

Thus, the simplification of the installation design is achieved by the exclusion of an additional discharge unit and the removal of gas from the dry gas cleaning apparatus and susceptible to destruction by drop moisture and overgrowing of low-temperature gases by the flue gas duct.

Improving gas cleaning efficiency and reducing energy consumption is achieved by organizing a more efficient mixing of gas streams, using serially connected high-speed dust concentrators and additional coagulation of the spray gas at the inlet and outlet of the Venturi tube.

Claims (3)

1. Installation for combined cleaning of high-temperature gases, containing a high-temperature gas duct, Venturi tubes, a drip catcher, a fuel-jet apparatus, a high-temperature gas mixing duct located in front of the heavy-duty apparatus, a cyclone-type concentrator with a high-temperature gas duct, a high-temperature bypass gas duct, and different incentives; that, in order to increase the gas cleaning efficiency, reduce energy consumption, simplify the installation design, it is equipped with an additional concentrator cyclone type, sequentially connected to the main, with an outlet nozzle, communicated with the axial region of the drip pan by means of a high-temperature gas bypass duct, a piezo-gas concentrate supply pipeline and an ejector placed inside the duct of high-temperature gases, oriented in the direction of flow and connected with a dust collector. supply pipe gas concentrate. 2. Installation pop 1, characterized in that it is supplied 12845836 shell, located coaxially to the gas duct displacement of high-temperature and low-temperature gases, communicated with it and with the bypass gas duct 5 high-temperature gases. ten 15 3.- Installation according to PP.1,2, that is, it is equipped with a cyclone placed at the end of the bypass duct inside the drip tray, the wall of the body of which is double, and the outlet and the exhaust pipe are communicated drift catcher, with the cyclone tube bent at an acute angle to the axis of the drift catcher. 3.- Installation according to PP.1,2, that is, it is equipped with a cyclone placed at the end of the bypass duct inside the drip tray, the wall of the body of which is double, and the outlet and the exhaust pipe are communicated drift catcher, with the cyclone tube bent at an acute angle to the axis of the drift catcher. 7