SU1452560A1 - Apparatus for wet cleaning of gas - Google Patents

Abstract

The invention relates to the process of wet gas cleaning of finely dispersed cement dust and can be used in the chemical, metallurgical, industrial building materials and other industries. The aim of the invention is to increase the time of inter-station operation of the apparatus and reduce the specific flow rate of the liquid. The apparatus for wet gas cleaning has a housing 1 with a bottom 2, a crush 4 in the form

Description

J The invention relates to j wet gas cleaning processes from finely dispersed cementing dust and may find application in the chemical industry, metallurgy and construction materials industry 5, as well as in other industries.

The aim of the invention is to increase the time of inter-stop operation of the apparatus and reduce the specific consumption of ⁴ ® fluid.

In FIG. 1 shows the proposed apparatus, a General view in section; in FIG. 2 - the same, a top view in section. ’

The device has a housing 1 with a conical: bottom 2, inlet pipe 3, a spherical cap 4 and an exhaust pipe

5. The conical bottom 2 ends with a cylindrical chamber. 6 with a drain-pipe sludge tube 7, covered from above by a conical visor 8. Inside the apparatus body, a guide plate 9 with perforated in-line pipes 10 for irrigation of the gas stream and an S-shaped partition are placed along the gas. 11, connected to the precipitation plate 12. The guiding element 13, the elastically fixed partitions 14 and the spiral nozzles 15 ras-30 are placed in the zone of the gas stream exit.

The sludge forced circulation line 16 consists of a discharge nozzle 17, a slurry pump and a tangential input nozzle 18. If the number of nozzles is more than one, the line also contains a collector for distributing sludge, installed after the pump. The number of tangentially introduced fittings for supplying sludge to the cylindrical chamber can be different and they are introduced at a different level at an angle of 15-35 ° to the plane tangent to the cylindrical surface at the input point and simultaneously to the flat bottom.

The device operates as follows.

Dusty gas through an inlet inclined inlet pipe 3 enters the apparatus and is irrigated with liquid supplied from pipes perforated into the line 10. In addition to humidifying the gas, the inlet liquid supply helps to flush away dust deposits in the inlet section of the pipe and from the guide plate, 9. The dusty stream bends around the guide plate , captures part of the liquid when the direction of movement changes and passes along the S-shaped septum 11, on the wet surface of which the dust collection shock mechanism is realized. In the area of the spherical lid 4, a liquid film formed on an S-shaped septum 11 breaks off from it in the form of fine droplets, forming a water curtain under the hemispherical lid. In this zone of the apparatus, moistened dust is captured by the inertial trapping mechanism. Further, the gas flow, enveloping the S-shaped baffle 11, again changes the direction of movement and hits the liquid surface between the elastically fixed partitions 14 located between the side walls 19 and 20 of the spiral nozzle 15, which prevent the liquid from reaching the exhaust pipe 5, and capture its part in the form of splashes and foam, as well as the entrainment of the apparatus. The gas stream swirls through the spiral nozzle 15 and enters the exhaust pipe. The guide element 13 deflects the gas stream and contributes to the creation of turbulence at the outlet.

The irrigation fluid is fully supplied to the gas inlet to the apparatus and from there enters the housing. Its level is usually maintained automatically and in a static state provides a deepening of the guide plate 9 and the elastically fixed partitions 14 to a depth of 0.6-0.7 of their height. In working condition, the liquid level deviates from horizontal under the influence of the pressure of the gas stream. Therefore, the sludge is drawn into the forced circulation line from the area under the exhaust pipe 5 by the outlet fitting 17. The slurry pump pumps the sludge into the cylindrical chamber 6 into which it is tangentially fixed; · the nozzle 18. The sludge moves in the annular gap between the shell of the chamber 6 and drain pipe 7 with high speed, providing a high degree of mixing. During mixing, erosion of lump deposits also occurs. The finely dispersed suspension rises to the upper part of the apparatus, and part of it is discharged through the drain pipe 7 from the apparatus.

The described device eliminates the violation of the apparatus due to unstable removal of sludge. A portion of the sludge dispersed by the pump can be recycled as an irrigation fluid.

The presence of a forced circulation line in the apparatus qualitatively changes the mode of its operation. This line makes it possible to obtain a slurry representing a uniform highly dispersed suspension with a constant concentration at any point in the system. High multiplicity of circulation makes it possible to increase the concentration of sludge by solid output 4-5 times compared with the sludge formed in the apparatus with their internal circulation. All this completely eliminates the formation of deposits in the zone of discharge of sludge from the apparatus and significantly reduces the consumption of fresh water consumed by the apparatus by supplying sludge to re-irrigate the gas stream. A fitting for the discharge of sludge to the forced circulation line is located in the apparatus body under the exhaust pipe and is buried in the liquid, which makes it possible to equalize the liquid level in the apparatus due to the formation of a funnel in the liquid layer under the exhaust pipe. The presence in the bottom of the apparatus of a cylindrical chamber, inside which there is a drain pipe and a tangentially fixed fitting for introducing circulating sludge into the apparatus, allows you to create a turbulent swirl flow in the annular gap, which helps to wash out dust deposits in the form of pieces, to obtain a homogeneous highly dispersed suspension for forced circulation, and also to withdraw part of the concentrated sludge from the drain pipe. A visor is installed above the drain pipe to prevent pieces from falling into the pipe. This arrangement of the drain pipe allows you to continuously remove the sludge and eliminates its clogging, guarantees a constant liquid level in the apparatus and, therefore, the constancy of its hydraulic resistance.

Due to the high values of the sludge circulation rate and a high degree of mixing, its deposits in the area of the outlet pipe and emergency stops on cleaning the apparatus are excluded, and the utilization rate of the apparatus operating time is increased. So, the mileage between cleaning internal surfaces from dust deposits increases by 4-5 times and amounts to ΙΟΙ 2 days. The penetration of elastically fixed partitions into the liquid only by 0.6-0.7 of their height reduces the rise in the liquid level at the gas outlet and its entrainment from the apparatus, eliminates wave formation on the liquid surface, which helps to optimize the process of sludge extraction through fitting '17, while the hydraulic resistance of the apparatus is of the least importance, all other things being equal. The depth of penetration of the elastically fixed partitions in the apparatus is chosen based on the lowest value of its hydraulic resistance, the increase of which is caused by a rise in the liquid level at the outlet of the apparatus when the Partitions are immersed and the resistance of the partitions itself increases (table).

f Organization of forced circulation reduces the consumption of fresh water for irrigation by 2 times.

I Additionally installed elastically fixed partitions reduce the fixed partitions of Sryzgunos by 2–3 times.

a nozzle, a spiral nozzle with side walls, an S-shaped partition connected to the precipitation plate, elastically fixed partitions, characterized in that, in order to increase the inter-stop operation time of the apparatus and reduce the specific fluid flow rate, it is equipped with a cylindrical chamber attached to the bottom of the bottom , a line for forced circulation of the sludge with a sludge outlet fitting deepened under the liquid level, and a sludge inlet fitting tangentially led to the cylindrical chamber, while the inlet end Foot sleeve disposed over .tsilindricheskoy chamber and uprugr mounted between the side walls Credited eral nozzle.

walls ustaspi-.

inventions

Claims (2)

one The invention relates to processes for wet gas cleaning of finely dispersed cementitious pipes and can be used in chemical industry, metallurgical and production of construction materials, as well as in other industrial sectors. The invention is an increase in the inter-station operation time of the apparatus and a reduction in the specific fluid flow rate. FIG. 1 image: the wives of the proposed apparatus, a general view in section; in fig. 2 - the same, top view in section. The apparatus has a housing 1 with a tapered bottom 2, an inlet nozzle 3, a spherical cover 4 and an exhaust pipe 5. The tapered bottom 2 ends in a cylindrical chamber. 6 with a drain pipe with a 7 pshama tube covered with a conical visor 8. A guide plate 9 with perforated in-line pipes 10 for irrigation of the gas flow and an S-shaped partition 11 connected to the settling plate 12 are arranged along the gas body. The guide element 13, the resiliently fixed partitions 14 and the spiral nozzles 15 are located in the exit zone of the gas stream. Line 16 of forced circulation of sludge consists of an outlet nozzle 17, a slurry pump and a tangent 0 five five  . 35, Inlet nozzle 18. When the number of nozzles of more than one line also contains a collector for the distribution of sludge, installed after the pump. The number of tangentially inserted fittings for feeding the slit into the cylindrical chamber can be different and is inserted at different heights at an angle of 15-35 to the plane tangential to the cylindrical surface at the insertion point and at the same time to the flat bottom. The device works as follows. The dusty gas through the inclined inlet nozzle 3 enters the apparatus and is irrigated with liquid supplied from the perforated pipes 10. In addition to moistening the gas, the inlet liquid helps to flush out dust deposits in the inlet section of the nozzle and from the guide plate, 9. The written stream bends around the guide plate captures a part of the liquid when the direction of movement is changed and passes along the S-shaped partition 1-1, on the wet surface of which the percussion mechanism is realized. In the area of the spherical edge 4, a film of liquid formed on the S-shaped partition 115 is torn off of it in the form of fine droplets, forming a water curtain under the hemispherical edge. In this area of the apparatus, the moistened dust is trapped by the inertial capture mechanism. Further, the gas flow, bending the S-shaped partition 11, again changes the direction of movement and hits the surface of the fluid between the elastic fixed partitions 14 placed between the side walls 19 and 20 of the spiral nozzle 15, which prevent the surge of fluid into the zone of the insulation pipe 5 , to seize its parts in the form of splashes and foam, as well as to carry it out of the apparatus. The gas flow is twisted, the passage spiral nozzles 15, and enters the exhaust pipe. The guide element 13 deflects the gas flow and contributes to the creation of an outlet swirl, anywhere in the system. The high multiplicity of circulation makes it possible to increase the concentration of sludge over the solid at the outlet by 4-5 times in comparison with the sludge formed in the apparatus. with their internal circulation. All this completely eliminates the formation of deposits in the zone of removal of sludge from the apparate and substantially reduces the consumption of fresh water consumed. apparatus due to the supply of slime for re-irrigation of the gas stream. A fitting for the discharge of sludge into the line of forced circulation is located in the body of the apparatus under the exhaust pipe and buried in the liquid, which makes it possible to equalize the liquid level in the apparatus due to the formation of a crowding liquid in the full volume of 20 ki in the fluid layer under the exhaust flue to the gas inlet into the apparatus and from there into the body. Its level is usually maintained automatically and in a static state ensures the penetration of the guide plate 9 and the elastically fixed partitions 14 to a depth of 0.6-0.7 of their height. In working condition, the liquid level deviates from the horizontal under the action of the pressure of the gas stream. Therefore, in the forced circulation line, the sludge is withdrawn from the area under the exhaust pipe 5 by the outlet fitting 17. The sludge pump pumps the sludge into the cylindrical chamber 6, into which it is introduced through the tangentially fixed fitting 18. The sludge moves in the annular gap between the sidewall of chamber 6 and drain pipe 7 at high speed, ensuring a high degree of mixing. During mixing, lump deposits are also eroded. The finely dispersed suspension rises to the upper part of the apparatus, and a part of it is re-circulated through the drain pipe 7 from the apparatus. The described device eliminates the violation of the mode of the apparatus due to non-stationary conditions at any point of the system. The high multiplicity of circulation makes it possible to increase the concentration of sludge over the solid at the outlet by 4-5 times in comparison with the sludge formed in the apparatus with their internal circulation. All this completely eliminates the formation of deposits in the zone of sludge withdrawal from the apparatus and substantially reduces the consumption of fresh water consumed by the apparatus by supplying scrap for re-irrigation of the gas stream. A fitting for the discharge of sludge into the forced circulation line is located in the body of the apparatus under the exhaust pipe and is buried in the fluid, which makes it possible to equalize the fluid level in the apparatus due to the formation of a crow. The presence in the bottom of the apparatus of a cylindrical chamber, inside which is located the drain pipe and a tangentially fixed fitting for input 5 of the circulating sludge in the apparatus, allows the turbulent flow to be created in the annular gap, which contributes to the thickening of the sediments in the form of pieces, to obtain a homogeneous highly dispersed suspension for forced circulation, and also to withdraw part of the concentrated sludge from the discharge nozzle. A visor is installed above the drain nozzle to prevent the pieces from entering the nozzle. This arrangement of the drain pipe allows continuous removal of sludge and clogs it, ensures a constant level of fluid in the apparatus and, consequently, the constancy of its hydraulic resistance. Due to the high values of the circulation rate of sludge and the high mixing pressure, its deposits in the outlet nozzle and emergency stops for cleaning the apparatus are eliminated, the utilization rate of the apparatus operation time is increased. So, five 0 Bil removal of sludge. Part of the dispersion-g-range between internal cleaning Sludge can be pumped for reuse as a spray liquid. The presence of a forced circulation line in the apparatus qualitatively changes its mode of operation. This line makes it possible to obtain slots, which are a homogeneous highly dispersed suspension with a constant concentration of 55 surfaces from dust deposits is increased 4-5 times and is 10-12 days. The penetration of fixed partitions into the liquid only by 0.6–0.7 in their height reduces the level of the liquid at the outlet of the hectare and its entrainment from the apparatus, eliminates wave formation on the surface of the cavity, which helps to optimize run between internal cleansing surfaces from dust deposits increase 4-5 times and amount to 10-12 days. The depth of the elastically fixed partitions into the liquid only by 0.6-0.7 of their height reduces the rise of the liquid level at the gas outlet and its discharge from the apparatus, eliminates wave formation on the surface of the liquid, which helps to optimize The process of sludge removal through the nozzle 17, in this case the value of the hydraulic-g0 resistance of the apparatus is of the greatest importance under all other conditions being equal. The depth of the fixed partitions in aijinapaTe is chosen based on the smallest value of its hydraulic resistance, the increase of which is caused by a rise in the level of fluid in the I code; 3 apparatus when immersed in a city and the increase in the resistance of the partitions proper (table). a nozzle, spiral nozzles with side walls, an S-shaped partition connected to the settling plate, elastically fixed partitions, characterized in that, in order to increase the inter-station operation time of the apparatus and reduce the specific flow rate, it is equipped with a cylindrical chamber attached to the bottom of the bottom , forced sludge circulation line with a sludge outlet pipe buried beneath the liquid level, and a nipple , .Gi., ™ "v- .S.: G - :: Ti ™ g This allows you to reduce the consumption of light, ". times: r „-gg, r„ 1st.; ... " between the side walls of the spi-ral attachment. The fixed partitions reduce Sryzgounos by 2-3 times. 20 formula of invention I J 1. Apparatus for wet cleaning of gas- 4a, including the housing, partially behind- 1) filled with liquid, with a bottom, roof in the shape of a half-cylinder, inlet ijtaTpy6KOM, exhaust pipe, drain Note, h is the height of the partitions. a nozzle, spiral nozzles with side walls, an S-shaped partition connected to the settling plate, elastically fixed partitions, characterized in that, in order to increase the inter-station operation time of the apparatus and reduce the specific flow rate, it is equipped with a cylindrical chamber attached to the bottom of the bottom , forced sludge circulation line with a sludge outlet pipe buried beneath the liquid level, and a nipple .: g - :: Ti ™ g 2. The apparatus according to claim. one This is due to the fact that, in order to reduce the flow resistance, the resiliently fixed partitions are recessed into the liquid at 0.6-0.7 of their height. Fi &.