RU2027483C1 - Flue gas cleaning device - Google Patents

Abstract

FIELD: cleaning of flue gases in power engineering; scrubbing of gases in processing plants with large-section gas conduits in metallurgy, chemical and other industries. SUBSTANCE: installation has inlet gas conduit 1, nozzle 2, and condenser 5. Nozzle is made in form of collector. Round-section collector is installed on cut of gas conduit. Through slot 3 is made on inner side of collector. Fume flow coming out of slot 3 attains conical shape. Nozzle 2 provides wetting of gas flow, its turbulization and creates additional draught in gas conduit owing to ejection. Section of gas flow at inlet into branch pipe 6 of condenser 5 is reduced from 10 to 25 times which provides most intensive condensation of gases at small consumption of water. EFFECT: enhanced cleaning of gases. 4 dwg

Description

 The invention relates to energy, in particular to the wet cleaning of flue gases in technological installations with large cross-sections of flues, and can be used in metallurgical, chemical and other industries.

 A device for cleaning gases, containing a Venturi pipe, in front of which are installed steam and water injection chambers with nozzles [1].

 The specified technical solution cannot be used for cleaning flue gases at high gas and smoke costs due to its design features.

 The closest in technical essence to the proposed one is a device for gas purification, selected as a prototype and containing an inlet duct with a pipe for supplying steam and a condenser with a receiving nozzle in communication with the inlet duct and located at a distance from the latter, and the outlet for gas [2 ].

 The disadvantage of this technical solution is the limited scope of its application - low-power smoke and gas-generating sources with small cross-sections of flues, since their large cross-sections will require economically unjustified and technically difficult conditions to supply a large quantity through the ejector at a significant air velocity, which would be sufficient for intensive turbulization of the gas stream and, especially, for foaming of the gas-cleaning liquid. Thus, this technical solution is impractical, since it is almost impossible to use for cleaning flue gases in flues with a large cross section.

 The purpose of the invention is the expansion of operational capabilities and increased efficiency.

 The goal is achieved by the fact that the device for cleaning flue gases containing an inlet duct with a pipe for supplying steam and a condenser with a receiving pipe in communication with the inlet duct and placed at a distance from the latter, and an outlet pipe for gas, the pipe for supplying steam is equipped with a nozzle in the form an annular collector installed along the edge of the duct and made on the inside with an annular slot placed at an angle to the axis of the duct and oriented in depth into the receiving pipe of the condenser, while the area ratio echeniya receiving pipe and the flue pipe is 0.04-0.4.

 In FIG. 1 shows a gas duct with a collector, section; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 - diagram of the operation of the device; in FIG. 4 is a diagram of a two-stage cleaning.

 The device contains an inlet duct 1, along the edge of which a nozzle 2 is installed, made in the form of an annular collector with an annular slot 3 placed at an angle to the axis of the duct, a steam supply pipe 4, a condenser 5 with a receiving pipe 6 located at a distance from the duct 1, the outlet pipe 7 capacitors. Steam cone torch 8 is oriented deep into the pipe 6.

 A dusted device operates as follows (Fig. 3).

 Wet steam under pressure through the pipe 4 enters the nozzle 2 and after flowing out of it through the slot 3, having received a cone-shaped directivity in the form of a cone torch 8, it concentrates the flue gases when the latter enters the receiving pipe 6 into a bundle with a cross section 10-25 times smaller compared to the nozzle section. This contributes to a more intense supersaturation of flue gases with vapors and their displacement, and also allows you to accelerate the process of condensation of the steam-smoke mixture at a lower flow rate of condensing water (due to a decrease in the volume of the condenser).

 The steam nozzle 2 in this device solves four problems: it forms and moistens the gas stream, contributes to its turbulization and forms additional thrust in the gas duct due to ejection.

 The ratio of the cross-sectional area of the receiving pipe and the gas duct 0.4-0.04 is most acceptable to ensure optimal condensation of gases at low water flow rates. The purified gas is discharged through the outlet pipe 7.

With powerful smoke-emitting sources, the flue gas cross section of which is more than 20 m ² , it is necessary to apply a two-stage cleaning scheme (Fig. 4), in which the capacitor is installed after the second stage. This setup allows you to achieve a sufficiently small cross section of the flue gas beam without the need for steam under high pressure.

 Capacitors can be used surface and scrubber types.

 Thus, the present invention can be used in large ducts with low steam consumption.

Claims (1)

 DEVICE FOR CLEANING SMOKE GASES, containing an inlet gas duct with a pipe for supplying steam and a condenser with a receiving pipe in communication with the inlet gas duct and located at a distance from the latter, and an outlet pipe for gas, characterized in that the steam supply pipe is equipped with a nozzle in the form of an annular a collector installed along the edge of the duct and made on the inside with an annular gap placed at an angle to the axis of the duct and with the orientation of the steam torch in the form of a cone into the depth of the receiving pipe, condenser, at volume ratio of the cross-sectional area of the receiving pipe and the cross-sectional area of the gas duct is 0.04 - 0.4.

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