RU2115744C1 - Device for control of flow rate of converter waste gases - Google Patents

Abstract

FIELD: ferrous metallurgy; wet gas cleaning. SUBSTANCE: device includes gas line with Venturi tube fitted in it on detachable module; confuser and diffuser parts of Venturi tube nozzle are made in form of drive blinds articulated in nozzle throat. Edges of blinds are movably secured on surface of detachable module. Blinds are used as drive adjusting unit for control of Venturi tube nozzle throat. In some versions, pairs of blinds are provided with motion synchronizers connected with blind motion drive by means of rods. EFFECT: reduction of toxic effluents; enhanced ecological safety; simplified construction and facilitated mounting. 14 cl, 11 dwg

Description

 The invention relates to steelmaking and can be used for wet gas cleaning of converter gases from oxygen-converter shops of metallurgical plants. In addition, the invention relates to the protection of the environment, since it increases the efficiency of the apparatus for wet gas purification of exhaust gases from metal processing.

 The prior art design of systems for wet gas purification of exhaust converter gases. These systems are characterized by explosion safety, a high degree of purification of gases from converter dust and reliability in operation, in connection with which they are equipped with most oxygen-converter shops (see Grigoryev V.P. et al. Design and engineering of steelmaking units. - M .: MISIS, 1995, pp. 64-72).

 Wet gas purification systems include devices designed to control the flow rate of exhaust converter gases (see Czechoslovak Patent No. 135390, 1970).

 The design of this device contains a control unit in the form of an element that is connected to the drive rod and blocks the bore of the Venturi pipe, the vertical movement of which adjusts the gap between the walls of the pipe in the area of its neck (critical section of the nozzle) and the blocking element. The overlapping element is hollow, with longitudinal outlet slots provided at the interface between the side surfaces of the pipe and the overlapping element. The liquid sprayed during dust deposition, falling into the neck, continuously flows out of it through the outlet slots located in the zone with the highest flow rate of the gas to be cleaned. This ensures the most uniform distribution of the working fluid over the cross section of the venturi. However, this device does not have a wide control range, since effective gas atomization requires relatively high gas flow rates (up to 120 - 180 m / s).

 For the prototype of the invention, a large Venturi pipe with a rectangular cross section and an adjustable neck size was selected, the adjusting means of which are made in the form of rotary dampers.

 The main disadvantage of the prototype is the unreliability of the means for regulating the bore of the pipe neck, which is due to the structural impossibility of corrosion protection in a highly aggressive environment (exhaust gases) of all moving parts of the adjusting mechanism and its drive, as well as difficult installation during repair or replacement.

 The objective of the invention is to increase reliability, simplify the design and installation of the node to change the flow area of the venturi.

 The solution to this problem is due to the fact that in a device for controlling the flow rate of exhaust converter gases containing a gas pipeline with a venturi pipe having confuser and diffuser parts and a node for controlling the critical section of the nozzle of the venturi pipe connected to the drive, according to the invention, confuser and diffuser parts Venturi pipes are made in the form of drive shutters pivotally interconnected in a critical section of the nozzle, the edges of which are movably fixed to the surface of the removable module, anovlennyh in the pipeline, wherein the shutter assembly function is performed to regulate the nozzle throat of the Venturi.

In embodiments according to the invention:
- the length of the confuser curtain is 0.15-0.6 the length of the diffuser curtain;
- the edges of the confuser and diffuser shutters are movably fixed to the removable module by means of hinges and sliders;
- the device is equipped with a second removable module, while the shutters of both modules are oppositely mounted in the gas pipeline; shutters in the critical section of the nozzle are connected to the actuator rod by means of a hinge link;
- movable curtains of both removable modules mounted opposite on the gas pipeline are interconnected by a synchronizer of their mutual movement for convergence or divergence of the curtains;
- the synchronizer of mutual movement of the blinds is made in the form of a quick-release bar connected to the curtains, for example, at the level of the outlet cut of the venturi nozzle, while the bar is connected to the cable rods of the drive;
- the gas pipeline is made with a Y-shaped branch, in the central branch of which the branching of the gas pipeline is placed, a node for regulating the critical section of the venturi nozzle is placed, made in the form of at least two movable, opposed pairs of shutters fixed in the central branch of the gas pipeline, in which at the same level, additional opposed pairs of shutters are installed, made in the form of hinged parallelogram links with a fixed upper link fixed in the area of convergence of gas pipeline branches and;
- the lower link of the articulated parallelogram is movable and connected to diffuser shutters by means of a quick-release bar mounted at the level of the outlet cut of the venturi nozzle, as well as with the drive by means of a traction;
- the node for controlling the critical section of the nozzle of the Venturi pipe is made in the form of opposed pairs of shutters mounted on a removable module, pivotally connected at the exit section of the nozzle with a spring-loaded rod, while in the critical section of the nozzle, in the bend zone, the hinged connection of the shutters is constantly supported on the drive axisymmetric elongated cam mounted on a rotary axis;
- the removable module is made in the form of a section of a gas pipeline fixed to the gas pipeline by means of hinged clamps with consoles rigidly connected to each other by means of adjustable rods with screw jacks;
- Opposite pairs of shutters of the drive unit for controlling the critical section of the venturi at the level of the outlet cut of the nozzle are pivotally connected to rods mounted on roller bearings connected to the drive;
- the edges of the shutters are equipped with sealing and knife elements installed with the possibility of their interaction with the gas pipeline walls adjacent to the edges of the shutters;
- in the cavities between the walls of the gas pipeline and each pair of shutters placed elastic easily deformable material with closed pores, such as foam.

 In FIG. 1 shows a general view of a removable module (longitudinal section, front view); in FIG. 2 is a general view of an embodiment (longitudinal section); in FIG. 3 - the same embodiment; in FIG. 4 - the same, an embodiment (general view axonometry); in FIG. 5 is a part of a general view of an embodiment (longitudinal section); in FIG. 6 is a general view of an embodiment (longitudinal section); in FIG. 7 - the same (embodiment); in FIG. 8 is a plan view of FIG. 7; in FIG. 9 is a general view of an embodiment (longitudinal section); in FIG. 10 is the same embodiment; in FIG. 11 is a plan view of FIG. ten.

 A device for controlling the flow rate of exhaust converter gases contains (see Fig. 2) a gas pipeline 1 with a Venturi pipe located inside the gas pipeline.

 The nozzle 2 of the venturi pipe (Fig. 6) is configured to control its critical section 3. In this case, the confuser and diffuser parts of the nozzle 2 are made in the form of a venturi of the confusor 4 and diffuser 5 shutters pivotally connected to each other in the critical section of the nozzle, the edges of which are movably fixed on the surface of the removable module 6. Both shutters 4 and 5 are connected to the drive for moving them.

 In embodiments of the device, the length of the confuser curtain 4 is 0.15-0.6 the length of the diffuser curtain 5. It is preferable that the edges of the confuser and diffuser shutters 4 and 5 be movably fixed to the removable module 6 by means of hinges 7 and sliders 8 (Fig. 1) . In this case, depending on the specific conditions, the confuser curtain 4 can be fixed on the removable module 6 or only rotary (on the hinge, 7, see Fig. 3), or with an additional limited possibility of translational movement (through the hinge 7 and the slider 8, see Fig. 1). This allows, if necessary, to more smoothly change the configuration of the nozzle 2 of the venturi.

 In the embodiment (Fig. 2), the device is made in the form of two removable modules 6 and 9, mounted opposite on the gas pipeline 1, and their shutters 4 and 5 are interconnected by hinges 10 and 11 located in the region of the critical section of the nozzle 2. In the same the nozzle region, both pairs of shutters of modules 6 and 9 are pivotally connected to the corresponding hinged links 12 and 13 connected to the rods 14 and 15 of the drives (moving the shutters) 16 and 17.

 In the embodiments of the invention (Figs. 4-7, 9-11), the movable curtains of removable modules mounted opposite to the gas pipeline are equipped with a movement synchronizer for synchronous convergence or divergence of the shutters. Said synchronizer may be made, for example, in the form of a quick-release rod 18 connected to the lower edges of both diffuser shutters 5 at the level of the outlet cut of the nozzle 2, while the rod 18 is connected to the drive cable mechanism 19 by means of cable rods 20 and 21 (Fig. 6 )

 In an embodiment (for a gas pipeline with a Y-shaped branch), the node for regulating the critical section of the nozzle of the Venturi pipe is made in the form of at least two pairs of movable, opposed shutters 4 and 5, mounted on removable modules 6 and 9 in the central branch of the gas pipeline 1, uniting branching of the gas pipeline, in which at the same level opposite pairs of shutters 22 and 23 are installed, made in the form of hinged parallelogram units with a fixed upper hinge 24 fixed in the area of convergence of the gas pipeline branches (fi 2).

 In a similar embodiment (Fig. 9), the lower movable link 25 of the hinged parallelogram is connected to the synchronizer, a quick-release bar 18, connected at the level of the nozzle exit edges to the edges of the diffuser shutters 5, while the movable link 25 is connected to the drive via a link 26 (to the drawing). conditionally not shown).

 In the embodiment (Fig. 7), the removable module is designed as a removable section of the gas pipeline, mounted on the gas pipeline using hinged clamps 27 with consoles 28, rigidly fixed to each other by means of adjustable rods 29 with screw jacks 30.

 In FIG. 7 also depicts one of the possible synchronizer embodiments in the form of a spring-loaded rod 31 pivotally connected at the nozzle exit section to the edges of the diffuser shutters 5, while the hinged connection of the shutters 4 and 5 is constantly supported due to the force of the springs 32 on the axisymmetric elongated cam 33 installed on the drive rotary axis 34.

 In the embodiment of FIG. 4, the synchronizer of the relative position of the shutters is made in the form of rods 36 mounted on roller bearings 35, connected through a plug 37 to a common drive (not shown conventionally in the drawing).

 In all embodiments, the edges of the shutters are preferably provided with sealing 38 and knife elements 39.

 In the embodiment (Fig. 5), in order to prevent premature failure of the assembly for regulating in its cavities between the walls of the gas pipeline and each pair of valves, elastic easily deformed material 40 with closed pores, for example foam rubber, can be placed.

 In FIG. 10 and 11 show an embodiment of a device for circular gas pipelines.

 In this embodiment, the synchronizer is made in the form of a rod polygon 41 connected to the lower edges of the diffuser shutters 5. Moreover, based on the specific conditions, the shutters 4 and 5 can be mounted either on separate removable modules (their number must be even), or on a common removable module similar to that shown in FIG. 7. In these embodiments, individual pairs of curtains in the plan should form a polygon with an even number of sides.

 The operation of the device is as follows.

 When it becomes necessary to change the gas flow rate through the nozzle of the venturi, for example, an actuator 16 is included, the driving force from which is transmitted through the rod 14 and the hinge link 12 to the shutters 4 and 5, making them move. When moving the blinds 4 and 5 have the ability to make a complex movement - turning around the hinges 7, mounted on the sliders 8, and the reciprocating movement together with these sliders (in embodiments, the curtain 4 has the ability to perform only rotational movement). This leads to a decrease or increase in the critical section of the nozzle 2.

 In embodiments, due to the additional connection of the lower edges of the opposed diffuser shutters 5, which are connected by a synchronizer of the relative position of the shutters, the pairs of shutters are synchronously moved and symmetrically installed in the nozzle 2 when its critical section changes. In the embodiments (Figs. 6, 7, 9, 10) due to the fact that the synchronizer is a link of the articulated multi-linker, there is no need for through slots in the module cases (Figs. 1, 2, 4) for the sliders 8. In these embodiments, the upper - the confuser blinds are pivotally mounted directly on the surface of the module (without sliders). This option of fixing the confuser curtains is also possible for the above options (Fig. 1, 2). Also in these embodiments, besides the one shown in FIG. 7, the movement of the synchronizer 18 leads to a corresponding movement of the shutters 5 and 4 and, accordingly, to a change in the orifice of the neck of the pipe (the critical area of the nozzle 2).

 In the embodiment (Fig. 4), the movement of the synchronizer, made in the form of an external plug 37, leads to a change in the position of the shutters and a corresponding change in the critical section of the nozzle.

 When the embodiment of the device is operating (Fig. 6), the synchronizer 18 is moved under the action of the drive cable rods 20 and 21. The intermediate rollers 42 and 43 are mounted on the intermediate supports 44 and 45, which, like the synchronizer 18, must be quick-detachable, for example, the cross-shaped tip of the supports during assembly is inserted into the mating cross-shaped socket fixed on the surface of the module. To prevent the possibility of losing quick-detachable elements during installation and dismantling, all quick-detachable elements can be equipped with safety elements 46, as shown in FIG. 6.

 During the operation of the embodiment of the device (Fig. 7), turning the cam 33 leads to a change in the position of the shutters, the hinge of which is constantly pressed to the cam 33 due to the force of the springs 32, which is transmitted to the diffuser shutters through the synchronizer (rod 31).

 When the embodiment of the device (Fig. 9) is operating, under the influence of the traction 26, the position of the shutters 4, 5, 22, 23 — the links of the closed articulated poly-linker — is changed, which ensures a synchronous change in the critical sections in both nozzles located at the outputs of the branches of gas pipeline 1. Resizing the articulated multi-linker in this embodiment occurs relative to the fixed link in the form of a frame 47 fixed to the branching mouth of the gas pipeline 1.

 The operation of the device variant (Fig. 10) is carried out similarly to the above, however, unlike the previous ones, in this embodiment the nozzle is made not slotted, but polyhedral, i.e. the application of the proposed device is possible on gas pipelines with a circular cross-sectional shape.

 The placement in the cavities between the surface of the module and the shutters of an elastic easily deformable material 40 with closed pores can reduce the amount of dust clogging in the cavity between the shutters and the module body, this is also facilitated by the installation of sealing elements 38 on the edges of the shutters.

 The shutters 4 and 5 can be made in the form of metal plates installed in the gas pipeline with a minimum clearance, while the lateral edges of the plates are also provided with sealing elements 38 along the entire length.

 Performing 7 knife edges on the sliders or supplying the device with separate knife elements 39 (sliders and knife elements can also be installed on synchronizers 18, see, for example, Fig. 6) allows you to clean the adhering dust layer when moving the curtains, as well as carry out preventive cleaning gas pipeline.

 In embodiments (see Fig. 6, 7, 9, 10), the device is equipped with one drive, due to which the loads arising from the movement of the curtains are symmetrical.

 When using the above-described variants of the proposed device, the repair of the regulating nodes of the gas pipelines is not difficult. Failed nodes mounted on the module are easily dismantled and can be repaired in stationary conditions. The installation of new units also does not present any difficulties. Due to this, equipment downtime is reduced and harmful dust and gas emissions into the atmosphere are reduced. It should be noted that for effective cleaning of gases from dust, it is necessary that the rate of entry of the dust and gas stream into the apparatus is optimal for specific conditions (for example, the concentration of dust in the gas, its fractional composition, etc.). In the process of metal processing, the mass and fractional composition of dust in gases and the amount of exhaust gases change, which leads to the need to quickly change the parameters of the gas cleaning system. The proposed device allows in the process to effectively control the feed rate of the dust and gas stream into the wet gas purification apparatus and, due to this, ensure the transfer of especially dangerous dust from gas to the treatment liquid, followed by the neutralization of toxic and hazardous substances in the liquid by known methods.

 Thus, the proposed device can significantly reduce harmful and toxic emissions into the environment, create the prerequisites for the disposal of these wastes and improve the ecology of production.

Claims (14)

 1. A device for controlling the flow rate of the exhaust converter gases, comprising a gas pipeline with a venturi pipe having confuser and diffuser parts, and a node for controlling the critical section of the nozzle of the venturi pipe connected to the drive, characterized in that the confuser and diffuser parts of the venturi drive shutters pivotally connected to each other in a critical section of the nozzle, the edges of which are movably fixed on the surface of a removable module installed in the gas pipeline, while the shutters perform the function tion of the drive unit to control the critical section of the venturi nozzle.  2. The device according to claim 1, characterized in that the length of the confuser curtain is 0.15-0.6 the length of the diffuser curtain.  3. The device according to any one of claims 1 and 2, characterized in that the edges of the confuser and diffuser are movably fixed to the removable module by means of hinges and sliders.  4. The device according to any one of claims 1 to 3, characterized in that it is equipped with a second removable module, while the shutters of both modules are oppositely mounted in the gas pipeline.  5. The device according to any one of claims 1 to 4, characterized in that the shutters in the region of the critical section of the nozzle are connected to the actuator rod by means of a hinge link.  6. The device according to claim 4, characterized in that the movable curtains of both removable modules opposite mounted on the gas pipeline are interconnected by a synchronizer of their mutual movement for convergence or divergence of the curtains.  7. A device according to any one of claims 4 to 6, characterized in that the synchronizer for mutual movement of the shutters is made in the form of a quick-release bar connected to the shutters, for example, at the level of the outlet cut of the venturi nozzle, while the bar is connected to the drive traction rods.  8. The device according to any one of claims 1 and 2, characterized in that the gas pipeline is made with a Y-shaped branch, in the central branch of which, combining the branching of the gas pipeline, there is a unit for regulating the critical section of the nozzle of the Venturi pipe, made in the form of at least two movable opposed pairs of curtains fixed in the central branch of the gas pipeline, in which additional opposed pairs of curtains are installed at the same level, made in the form of hinged parallelogram links with a fixed upper link, fixed in the area of convergence of the branches of the pipeline.  9. The device according to claim 8, characterized in that the lower link of the hinged parallelogram is movable and connected to diffuser shutters by means of a quick-release bar mounted at the level of the outlet cut of the venturi nozzle, and also with a drive by means of a traction.  10. The device according to any one of claims 5 to 6, characterized in that the node for regulating the critical section of the nozzle of the Venturi pipe is made in the form of opposed pairs of curtains mounted on a removable module, pivotally connected at the level of the exit section of the nozzle with a spring rod, critical nozzle section, in the bend zone, the hinged connection of the shutters is constantly supported by an axially symmetric elongated drive cam mounted on the rotary axis.  11. The device according to claim 1, characterized in that the removable module is made in the form of a section of a gas pipeline fixed to it by means of articulated clamps with consoles rigidly connected to each other by means of adjustable rods with screw jacks.  12. The device according to any one of claims 1 to 11, characterized in that the opposed pairs of shutters of the critical section section of the nozzle of the venturi at the level of the outlet cut of the nozzle are pivotally connected to rods mounted on roller bearings connected to the drive.  13. The device according to any one of claims 1 to 11, characterized in that the edges of the shutters are equipped with sealing and knife elements with the possibility of their interaction with the walls of the gas pipeline adjacent to the edges of the shutters.  14. The device according to any one of paragraphs.1 to 12, characterized in that in the cavities between the walls of the gas pipeline and each pair of shutters placed elastic easily deformable material with closed pores, such as foam.

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