FR2517691A1 - Coke oven ascension pipe nozzle - with vortex chamber for gas cleaning has extra vortex chamber for charging gases ejection - Google Patents

Abstract

A nozzle to atomize a liquid in the ascension pipe of a coke oven consists of at least one additional cylindrical vortex chamber which has a separate tangential inlet for the liquid and a separate axial nozzle opening from the first. The two vortex chambers have a different diameter and are joined to each other by an overflow port in the partition between them. This ensures both an ejection of the coal charging gases and a cleaning of the coke oven gases from floating resin and tar particles. (First major country equivalent to CS8109629).

Description

 The present invention relates to the equipment of coking plants and in particular relates to an injector used to spray a liquid into the chimney of a coke oven.

 The design of iajcteus of known types used to spray a liquid into the chimney of a coke oven is such that the sprayed liquid leaves in a single jet at constant opening angle.

 For example, there is an injector for spraying a liquid (see USSR author's certificate NO 345936) comprising a body in which is formed a swirl chamber having tangential and axial liquid inlet passages and a spray nozzle.

 The liquid arrives in the swirl chamber through the two passages simultaneously. Most of the liquid is brought in through the tangential passage in the swirl chamber, from which, after having swirled on its walls, it exits by spray nozzle forming a hollow jet The remaining part of said liquid, that which is the smallest, arrives in the swirl chamber by the axial passage and leaves this chamber, still by said spray nozzle, in a jet formed in the hollow of the previous jet. In this way a single, full spray jet is formed. In coking plants, where they are normally installed in the toggle (or elbow) of the coke oven chimney, the liquid spray injectors are used to entrain the charging gases. from the coke oven chimney in the gas collector and, for this reason, are only put into operation during supply, the duration of which varies between 3 and 4 min. During the coking, which normally lasts from 15 to 18 hours, the injector does not work. During this time, the knee joint of the chimney is traversed, below the injector, by the hot gases resulting from the coking, which transport resinous particles and other suspended solid particles, the deposition of which on the walls of the chimney, under the injector} gives rise to resinous agglomerations, and the penetration of which, through the spray nozzle, into the swirl chamber and the deposition inside thereof, during said 15 to 18 hours, lead to the obstruction of this chamber.

 This drawback can be overcome by constant purification of the coke oven gases with a view to ridding them of said resinous and solid particles which are in suspension therein.

 To this end, the chimney brace must be the seat of a permanent spraying of liquid, operated so that this liquid forms a jet with an opening angle greater than that of the jet intended to entrain the charging gases, this which allows the purification of the coke oven gas under the injector, along the entire passage section and the entire height of the toggle of the chimney of the coke oven. This spray of liquid spray must be produced in such a way that it either confused with the jet of liquid intended to bring in the charging gases, or else must be as close as possible to the latter, and this, so as not to affect the entrainment of the charging gases and so that the two jets of liquid, obtained simultaneously, can give the maximum yield.

Arranged next to each other in the knee joint of the chimney, the injectors for spraying the liquid, which are provided with swirl chambers of different diameters and which produce jets of liquid with different opening angles, do not allow to make these jets coincide or else to bring them one towards the other in a suitable manner, owing to the fact that their vortex chambers and, thereby mime, the spray nozzles thereof are very far apart the other because of the overall dimensions of the inåectdursX
It has therefore been proposed to develop an injector intended to spray a liquid into the chimney of a coke oven, which, by the design of its swirl chamber, would be characterized by perfect reliability in terms of l entrainment gas from the chimney of the coke oven0
This problem is solved using an injector to spray a liquid into the chimney of a coke oven, of the type comprising a body in which is formed a swirl chamber of cylindrical shape - having an inlet passage for tangential liquid and an axial spray nozzle, which injector is characterized, according to the invention, in that at least one additional cylindrical swirl chamber is provided in said body and in that it has a liquid inlet passage and an individual spray nozzle, the two swirl chambers being of different diameters and communicating with each other via a bypass channel.

During the entire coking period, a spray of liquid is sprayed in the knee joint of the chimney of the coke oven, using said additional swirl chamber, which makes it possible to purify the coke oven gas passing through the zone situated under the injector and arriving in the collector, freeing it of its resinous and solid particles in suspension0
Then, the other swirling chamber, the one which only works during charging in order to entrain the resulting gases, is traversed year-round by a liquid arriving in this chamber by the bypass channel from the additional swirl chamber.This avoids the obstruction of this swirl chamber by the particles contained in the coke oven gas and makes its operation reliable during charging0
Because the two swirl chambers are arranged in a same body and are of different diameters, the liquid leaves the injector by forming two jets close to each other and which have different opening angles. This makes it possible to rid the coke oven gas passing through the toggle of its resinous and solid particles over the entire height of this toggle and during the entire coking period and, at the same time, to entrain the gases resulting from the charging.

 On the other hand, the fact of permanently spraying the inside of the knuckle-joint of the chimney of the coke oven using one of the swirl chambers prevents the agglomeration of the resinous materials on the walls of this knuckle-joint. and on the surface of a plate valve housed therein and reduces the temperature of the coke oven gas by 10-150C.

 It is rational to produce one injector so that its bypass channel is tangential to the cylindrical walls of the swirl chambers.

 Carried out in this way, the bypass channel contributes to the fact that the liquid arrives in the respective swirl chamber by swirling therein and, thereby, contributes to the cleaning of this chamber, or else, during the operation of all the chambers improves the entrainment of the charging gases by the appearance of an additional spray of liquid.

 It is also rational to provide in the swirl chambers mentioned swirlers in the form of cylindrical linings in which are inclined lateral passages whose angles of inclination vary from one swirl to another.

 This embodiment makes it possible to vary the opening angle of the spray of liquid spray leaving the spray chambers if necessary.

The invention will be better understood and other objects, details and advantages thereof will appear from the description description of the ixRure which will follow from an embodiment given solely by way of nonlimiting example with reference to the nonlimiting drawings appended in which
- Figure 1 is a sectional view of an injector for spraying a liquid into the chimney of a coke oven, according to the invention
- Figure 2 is a sectional view along Il-Il of Figure 1
- Figure 3 is a sectional view along III -III of Figure I
- Figure 4 shows a coke oven chimney in which is mounted an injector according to the invention.

 As shown in FIG. 1, the injector for spraying a liquid into the chimney of a coke oven comprises a cylindrical body 1 in which is arranged a swirl chamber 2 of cylindrical shape used to spray the liquid in order to entrain charging gases. According to the invention, there is seen in the body I another swirl chamber 3 (called additional) whose function is to spray the liquid for the purification of coke oven gas.

Each of the swirl chambers 2, 3 is provided with a whirlpool, respectively, 4 and 5, in the form of a cylindrical lining having inciinated lateral passages 6 and 7, respectively (see FIGS. 1 and 2) o
The angles d! the inclination of the passages 6 and 7 made in the swirling linings 4 and 5 are different.

 Each of the swirl chambers 2 and 3 individually has a tangential inlet passage 8 and 9, respectively (FIG. 2) and an axial spray nozzle, respectively 10 and II (FIG. 1).

The swirl chambers 2 and 3 communicate with each other via a bypass channel
pass 12 (see FIGS. 1 and 2), which is produced in the body 1 above the swirlers 4 and 5 (see FIG. 1). The bypass channel 12 is produced along a tangent to the cylindrical walls of the swirl chambers 2 and 3.

 The body 1 (see FIG. 1) of the injector is provided with a removable cover 13 with a seal 14.

 As shown in Figure 4, the injector 14 for spraying the liquid is mounted on the gas chimney, which consists of a vertical section 16 whose lower part is connected to the interior of the coke oven (not shown ) and a toggle (or elbow) 17 in which is mounted a plate valve 18 connected to a gas manifold (not shown in Figure 4).

The injector 15 communicates via pipes 8, 9 (see FIG. 2) with a high pressure water pipe 19, by a hydraulic injection valve 20, and with a low pressure water pipe 21, respectively.

 The injector for spraying the liquid into the chimney of a coke oven operates as follows.

 Before proceeding with charging, the valve 20 is operated so that the conduit 19 (FIG. 4) begins to supply the swirl chamber 2 (FIG. 1) of the injector 15 (FIG. 4) with ammonia water, which arrives in this chamber by the tangential passage 8 under a pressure between 15.17 and 20.26.1O: Pa.

Once in the turbocharging chamber 2, the ammonia water falls on the whirlpool 4, passes through its inclined lateral passages 6 and, by swirling, leaves through the spray nozzle 10, forming a jet with an opening angle of 300 in the kneepad 17 of the chimney (see FIG. 4). This jet of sprayed water covers the entire passage section of the kneepad 17 in the vicinity of the plate valve 18 mounted in the lower part of this kneepad and causes the entrainment of the charging gas from the vertical section 16 of the chimney into the gas manifold (not shown) by the toggle switch 17 during the entire charging operation
The charging being finished, that is to say after 3-4 min, the valve 20 is closed and the supply of ammonia water stalls in the swirl chamber 2 ceases.

 To obtain a spray of water spray with an opening angle of 300, the angle of inclination of the lateral passages 6 in the swirler 4 and the dimensions of these passages, as well as the diameters of the chamber, are suitably chosen. swirl 2 and spray nozzle 10.

 During the entire charging and coking period, the ammonia water arrives at a pressure of 2.03 to 3.04.îO5Pa in the swirl chamber 3 (Figure 1). Provided by the conduit 21, it arrives there by the tangential passage 9 and, once in this chamber, it crosses the inclined lateral passages 7 of the swirler 5 and leaves by swirling through the axial spray nozzle 11 in the toggle joint 17 (FIG. 4 ), while forming a jet with an opening angle of 60.

 To obtain a spray of water spray with an opening angle of 600, the angle of inclination of the lateral passages 7 in the swirler 5 and the dimensions of said passages, as well as the diameters of the swirl chamber 3, are suitably chosen. and the spray nozzle 11.

 This spray of water spray covers the entire passage section of the knee lifter 17 (FIG. 4), in the vicinity of the injector 15, by spraying the coke oven gas which passes through this knee lifter towards the gas collector (not shown) and by ridding this gas, over the entire height of the toggle joint 17, of resinous and solid particles in suspension, In mye time, this spray of water spray helps to reduce the temperature of this gas by 10-150C. All of this ensures reliable operation of the injector.

On the other hand, this spray of water spray prevents agglomeration of resinous materials and graphite on the walls of the kneepad.
Because the ammonia water is only brought into the swirl chamber 3 (Figure 1) and that the swirl chamber 2 does not work at this time, the ammonia water arrives in this chamber 2 through the by channel -pass 12 (Figures 1 and 3). Since the bypass channel 12 is produced at a tangent to the cylindrical walls of the swirl chambers 2 and 3, the ammonia water passing through this channel under a pressure of 2-3 atm begins to swirl as soon as it reaches the swirl chamber 2. As a result, it flutters on the walls of the swirl chamber 2 while cleaning the latter and exits through the spray nozzle 10 in the knuckle of the chimney.

The same channel 12 is crossed by ammoniacal water coming from the swirl chamber 2, where it arrives under a pressure of 15.17 to 20.26.105 Pa during the charging operation () oven is not shown in the drawings) with a view to entraining the charging gases from the vertical section i6 of the chimney in the toggle 17of the latter and, then, in the gas manifold which, too, is not shown in the drawings0
The ammoniacal water passes from the swirl chamber 2 into the swirl chamber 3, through the channel 12, in the opposite direction to that of the swirling of the water during its tangential feed into the swirl chamber 3 slows the swirl of the stream of ammoniacal water in this chamber 3 and, thereby, contributes to the formation of an additional spray of water spray with an opening angle of 300. This additional spray of water, which is observed at the outlet from the swirl chamber 3, makes it possible to reinforce the entrainment of the charging gas during the operation of the swirl chamber 2o This improvement in the entrainment of the gas in the manifold in turn makes it possible to reduce the water pressure applied to injector 150

Claims (3)

 1.- Injector for spraying a liquid into the chimney of a coke oven, of the type comprising a body (1) in which is formed a swirl chamber (2) of cylindrical shape having an inlet passage for tangential liquid (8) and an axial spray nozzle (10), characterized in that at least one additional cylindrical swirl chamber (3) is provided in the body (1) and has a tangential liquid inlet passage ( 9) and an individual axial spray nozzle (11), the two swirl chambers (2, 3) being of different diameters and communicating with each other via a bypass channel> ( 12).  2.- Injector according to claim 1--, characterized in that the bypass channel (12) is tangential to the cylindrical walls of the swirl chambers (2,3) *  3.- Injector according to one of claims 1 and 2, characterized in that in the swirl chambers (2, 3) are provided swirls (4, 5) in the form of cylindrical linings in which are made lateral inclined passages (6, 7) whose angles of inclination vary from one vortex to another.