JP2012532018A - Electrostatic filter - Google Patents

Abstract

  The present invention is an electrostatic filter provided with a housing having at least a substantially circular cross-sectional section, the section having a longitudinal direction perpendicular to said cross-section for a gas flow containing particles. A large number of dust collecting plates (3) are arranged in the housing, and the dust collecting plates (3) are directed parallel to each other and extend in the longitudinal direction (L). The present invention relates to an electrostatic filter of the type that forms a plurality of passages and in which the dust collecting plate (3) can be struck by at least one hammering rod (8) for the purpose of dust removal. In the configuration of the present invention, at least some of the dust collecting plates (3) are respectively supported by the upper partial plate (3a) supported in a suspended manner and in a standing manner. The lower partial plate (3b) is formed as a plate pair.

Description

  The invention is provided with an electrostatic filter (Elektrofilter) of the type described in the superordinate concept of claim 1, i.e. a housing with a section of at least a substantially circular cross section, the section comprising particles. A number of dust collecting plates are arranged in the housing, and the dust collecting plates are directed parallel to each other in the longitudinal direction. The invention relates to an electrostatic filter of the type forming a plurality of extending passages, wherein the dust collecting plate can be struck by at least one hammering rod for the purpose of dust removal.

  EP 0 252 371 describes an electrostatic filter in the form of an electrostatic dust collector. In this electrostatic precipitator, a gas stream containing particles or dust is guided between parallel dust collecting plates into a substantially cylindrical housing section. A plurality of passages extending in the longitudinal direction are provided between the dust collection plates aligned in parallel, and discharge electrodes (Spruehelektrode) stretched on the frame are disposed in these passages. .

  The object of the present invention is to provide an electrostatic filter which has a simple manufacturability and at the same time has a high operational safety and efficiency.

  According to the present invention, according to the invention, in the electrostatic filter of the type described at the outset, the features according to claim 1, i.e. at least some of the dust collecting plates, The problem is solved by being formed as a plate pair consisting of an upper partial plate supported in a suspended manner and a lower partial plate supported in a standing manner. An improved means of flexible plate support and dedusting by dividing the dust collecting plate into an upper partial plate supported in a suspended manner and a lower partial plate supported in a standing manner Is obtained.

  Such a configuration has various advantages depending on the requirements and the embodiments to be described in detail. First, for example, in the case of the known prior art, displacement or runout of the plate bearing, which is caused by hammering in a plate that is tightly screwed, is avoided. In addition, the problem of mechanical distortion of rigidly screwed plates or consistent plates, such as those caused by thermal expansion, is also avoided. This leads to an improved lifetime while at the same time making the spacing for the electrodes leading to the voltage more constant, for example.

  Furthermore, the invention makes it possible to form the beating means more simply than in the case of, for example, a tightly screwed plate. In particular, it may be sufficient to provide a single strike shaft with a plurality of hammers on one end face of the plate field.

  An advantageous main area of use of the electrostatic filter according to the invention is the dust removal of the converter gas. Based on the discontinuous mode of operation of the converter, the gas purification plant is alternately flowed by combustible converter gas containing dust and ambient air containing only light dust. During the converter blowing stage, the generated combustible converter gas is collected in a gas container after dust separation. A switching station installed downstream of the electrostatic filter allows non-combustible exhaust air to be diverted to the environment through the flue. If the converter gas and the oxygen-containing exhaust air are mixed with each other during the suspension of blowing, an explosive gas mixture may be generated. Such explosive gas mixtures may ignite in the electrostatic filter and cause an explosion. Such an explosion may cause a dust impact that impairs the separation capability of the electrostatic filter. In addition, the dust impact hinders converter operation. This is because dust impact can cause interruption of the blowing process. The electrostatic filter according to the invention is therefore particularly suitable for such a use area due to the sum of its features, which means that the circular housing shape allows a particularly convenient flow while at the same time Even more so as it allows for good mechanical strength of the entire filter.

  In a particularly advantageous embodiment of the invention, each partial plate of a plate pair is itself arranged flexibly, in particular swingable. As a result, particularly effective beating on the partial plate can be realized. In this case, in particular, striking takes place at the respective free end ranges of the partial plates, ie the lower end of the suspended partial plate and the upper end of the standing partial plate.

  In order to be able to advantageously construct all dust collecting plates as much as possible and to be struck by a simple structure, in an advantageous configuration of the invention, the boundary between each upper partial plate and each lower partial plate is , Extending to approximately half the height of the housing. In general, this also captures the lateral plate, ie the lateral plate, which is the shortest plate based on the circular housing cross section, as viewed laterally.

  In another advantageous embodiment, the multiple dust collecting plates, which consist of an upper partial plate and a lower partial plate, form a single plate wall as a whole, the plate wall being only on one side. It is hit by a driven hammer rod. This eliminates the need for cumbersome mechanisms for striking on both sides, such as known, for example, in accordance with the known prior art, in order to be able to strike a non-divided, rigidly screwed dust collecting plate sufficiently effectively. Can be.

  In general, the dust collecting plate consisting of an upper partial plate and a lower partial plate is guided by a single striking rod, so that this striking rod produces a blow and at the same time at least partly In addition, the plate can be reliably adjusted or held in operation.

  In general, it is advantageous that a plurality of reinforcing rings are arranged one after the other in the longitudinal direction in the housing, and one field (dust collecting plate region) of the dust collecting plate is arranged between the two reinforcing rings. Yes. Such a field may consist, for example, of a number of plate walls that are parallel to each other, the plate walls being oriented parallel to the height direction and the longitudinal direction of the housing, respectively. It consists of a number of dust collecting plates or partial plate pairs arranged one after the other. With such a reinforcing ring, the housing can be formed in a significantly more pressure-resistant and statically stable manner than before. In this case, the support elements for the dust collecting plate and / or the electrode frame may be accommodated in these reinforcing rings.

  In a further advantageous refinement, at least one of the reinforcing rings is formed rotationally asymmetric. This means in particular that the reinforcing ring has at least two effective length sections with cross-sectional shapes that are significantly different from one another over its entire circumference.

  Particularly advantageously, in this case, a supporting frame for accommodating a lower partial plate supported in a standing manner is accommodated in the lower section of the reinforcing ring.

  Furthermore, it is advantageous if the lower section of the reinforcing ring has a weakened cross-sectional profile compared to the upper section. This provides enough space to support the support frame for the stand-supported partial plate in the lower section of the reinforcing ring, for example without significantly reducing the free passage cross section of the housing. Can be provided.

  In a further advantageous embodiment, the reinforcing ring comprises a tensile material, which in an advantageous variant is arranged in the range of horizontal diameters. It is particularly advantageous if the tensile material is formed as a lattice frame in order to obtain a lightweight structure. In general, the tensile material may be advantageously formed as a walkable path, so that the tensile material allows easy access to the dust collecting plate for maintenance purposes.

  Further advantages and features of the invention are described in the embodiments described below as well as in claim 2.

  In the following, advantageous embodiments of the invention will be described in detail with reference to the drawings.

It is a perspective view which shows 1 field of the several dust collecting plate of the electrostatic filter by this invention. It is a perspective view which shows four reinforcement rings of an electrostatic filter.

  An electrostatic filter or electrostatic precipitator according to the present invention has a housing (not shown) having a substantially constant and substantially circular cross section in a cylindrical section. In this case, the longitudinal direction L of the electrostatic filter extends in the direction of the cylinder axis, and the electrostatic filter is also circulated by a gas containing particles or dust in this direction.

  The cylindrical housing section is provided with four reinforcing rings 1 that are spaced apart from each other in the longitudinal direction L. These reinforcing rings 1 serve first to support the housing and second to hold the field (dust collection plate area) 2 of the dust collection plate 3.

  One such field 2 is illustrated in FIG. The field 2 has a plurality of parallel plate walls 4 extending in the longitudinal direction L and the height direction H, respectively. Each of these plate walls 4 is composed of a plurality of dust collecting plates 3 arranged one after the other in the longitudinal direction L. Passages for gas conduction extend between the plate walls 4, and electrode frames are arranged in these passages (not shown).

  Each of the dust collecting plates 3 has an upper partial plate 3a and a lower partial plate 3b. The upper partial plate 3 a is supported in a suspended manner on the upper support strip 5 of each plate wall 4. These support strips 5 project slightly beyond the field 2 on the end face side and are supported in corresponding housings 6 provided in the upper section 1a of the support ring or reinforcement ring 1.

  The lower partial plate 3b is accommodated in the lower support frame 7 or is supported in a standing manner. The lower support frame 7 has curved end arch portions 7a and rib members 7b extending along the longitudinal direction L between the arch portions 7a. The rib members 7b The lower partial plate 3b is accommodated.

  It can be understood that the upper partial plate 3a and the lower partial plate 3b are the dust collecting plates 3 divided in the middle when viewed as a whole. In this case, both partial plates are supported in a swingable and flexible manner. The dividing plane extends to a height that is approximately ½ of the height of the dust collection plate 3 or the electrostatic filter. Due to the structure, the partial plates 3a, 3b or the dust collecting plate 3 located on the edge side when viewed in the width direction B are arranged at the center portion when viewed in the width direction B, and the maximum free inner height of the electrostatic filter. It is formed shorter than the partial plates 3a and 3b or the dust collecting plate 3 extending over the plate.

  In the middle of the dividing plane, a device consisting of a plurality of hammering rods 8 is provided. These striking rods 8 are struck in the longitudinal direction L by a single single striking mechanism (not shown) per field. The striking rods 8 of one field 2 are connected to one another by a transverse rod 9. Since each individual partial plate 3a, 3b is located between two striking blocks 8a of one striking rod 8, each of the movably supported partial plates 3a, 3b is subjected to striking by the first striking block. It is displaced in one direction and then collides with the second striking block. This provides an effective knock-down of the collected dust from the dust collection plate. At the same time, the hammering rod 8 serves as a guide for the movably supported partial plates 3a, 3b.

The mounting of the hammering rod is as required
a) by means of a single pin provided at the lower end of two suspension-supported partial plates (not shown), or b) each with a support structure at each end face (not shown) This is done by one swing joint (Pendelgelenk).

  The double-suspension type is known in a similar form from the electrostatic filter having a square structure, but in this case, the dust collecting plate is not divided and is exclusively supported by the suspension type. The lower end of the consistently extending plate is hit.

  The arch portion 7 a of the lower support frame 7 is accommodated in the lower section 1 b of the reinforcing ring 1. For this purpose, the lower section 1b has a cross-sectional profile (cross-sectional profile) that is weakened relative to the upper section 1a. In a specific case, the upper section 1a has a square cross section and the lower section 1b has a T-shaped cross section.

  Based on the fact that the upper and lower sections 1a, 1b of the support ring or the reinforcing ring 1 have different cross-sectional profiles, the reinforcing ring 1 is formed rotationally asymmetrically. The lower section 1b extends only over a circumference slightly smaller than ½ of the entire circumference of the reinforcing ring 1. Further, from the upper section 1a, lateral vertical support portions 1c are continued in a tangential direction, and these support portions 1c can provide additional support for the electrostatic precipitator or the entire electrostatic filter. .

  One tensile member 10 is provided at a height corresponding to approximately ½ of the height of the reinforcing ring 1. The tensile material 10 extends along the horizontal diameter of the reinforcing ring 1. The tensile material 10 is processed and molded as a lattice frame and is formed as a walking path through which the electrostatic filter can be satisfactorily passed for maintenance purposes.

  Of course, a plurality of electrode frames (not shown) for conducting voltage (conducting electricity) are provided between the dust collecting plates constructed in accordance with the present invention in a known manner.

  A scraper or a scraping device (not shown) is provided below the field. The scraping device is also constructed in a known manner (see, for example, FIG. 2 of EP 0252371). The scraping device can reciprocate under the support frame 7. As a reminder, the configuration of the present invention allows a larger surface to be covered by the scraping device. This allows for improved dust removal, which reduces the risk of dust impact and improves the overall separation capacity.

  The invention is provided with an electrostatic filter (Elektrofilter) of the type described in the superordinate concept of claim 1, i.e. a housing with a section of at least a substantially circular cross section, the section comprising particles. A number of dust collecting plates are arranged in the housing, and the dust collecting plates are directed parallel to each other in the longitudinal direction. The invention relates to an electrostatic filter of the type forming a plurality of extending passages, wherein the dust collecting plate can be struck by at least one hammering rod for the purpose of dust removal.

EP 0 252 371 describes an electrostatic filter in the form of an electrostatic dust collector. In this electrostatic precipitator, a gas stream containing particles or dust is guided between parallel dust collecting plates into a substantially cylindrical housing section. A plurality of passages extending in the longitudinal direction are provided between the dust collecting plates aligned in parallel, and discharge electrodes (Spruehelektrode) stretched on the frame are disposed in these passages. .
German Offenlegungsschrift 29222224 describes a roll-type electrostatic filter for removing and purifying suspended particles contained in a gas from a gas. In this case, the dust collecting strip electrode and the discharge strip electrode are arranged in the housing in the form of Archimedes spirals wound around the frame. The frame of each electrode is rotated 180 ° relative to each other. Both electrodes have one common winding center point.
French patent application 2 363 373 describes a horizontally arranged filter installation configured as an electrostatic filter for purifying gas. The gas to be purified is guided through the container through this electrostatic filter. In this container, a plurality of electrodes are arranged at intervals. The electrode system consists of an upper frame and a lower frame, which are connected to each other by studs. In order to obtain a constant spacing between adjacent electrodes, the ends of the electrodes are guided in combs. In order to remove dust, the electrode is moved by a suitable vibration device, and in this case, dust is separated from the surface of the electrode.
German Offenlegungsschrift 29 49 722 describes a discharge field for use in high temperature, high pressure electrostatic filters with a housing having a circular cross section. The housing is erected to rise at an angle of 50-70 ° with respect to the horizontal line. In the housing, there is provided at least one field of a plurality of plate-like dust collecting electrodes arranged in the vertical direction and extending over substantially the entire gas flow cross section.

  The object of the present invention is to provide an electrostatic filter which has a simple manufacturability and at the same time has a high operational safety and efficiency.

  According to the present invention, according to the invention, in the electrostatic filter of the type described at the outset, the features according to claim 1, i.e. at least some of the dust collecting plates, The problem is solved by being formed as a plate pair consisting of an upper partial plate supported in a suspended manner and a lower partial plate supported in a standing manner. An improved means of flexible plate support and dedusting by dividing the dust collecting plate into an upper partial plate supported in a suspended manner and a lower partial plate supported in a standing manner Is obtained.

  Such a configuration has various advantages depending on the requirements and the embodiments to be described in detail. First, for example, in the case of the known prior art, displacement or runout of the plate bearing, which is caused by hammering in a plate that is tightly screwed, is avoided. In addition, the problem of mechanical distortion of rigidly screwed plates or consistent plates, such as those caused by thermal expansion, is also avoided. This results in an improved lifetime while at the same time making the spacing for the electrode through which the voltage passes, for example, more constant.

Claims (12)

  An electrostatic filter is provided having a housing with at least a substantially circular cross-sectional section, which section allows a gas flow containing particles in a longitudinal direction (L) perpendicular to said cross-section. A large number of dust collecting plates (3) are arranged in the housing, and the dust collecting plates (3) are directed parallel to each other and have a plurality of passages extending in the longitudinal direction (L). In an electrostatic filter of the type, wherein the dust collecting plate (3) is struck by at least one hammering rod (8) for the purpose of dust removal, the dust collecting plate (3) At least some of the dust collecting plates (3) are each composed of an upper partial plate (3a) supported in a suspended manner and a lower partial plate (3b) supported in a standing manner. Formed as a pair Electrostatic filter, characterized in that there.   2. The electrostatic filter according to claim 1, wherein each partial plate (3a, 3b) of a pair of plates is arranged flexibly, in particular swingably.   3. Static according to claim 1 or 2, wherein the boundary between each upper partial plate (3a) and each lower partial plate (3b) extends to approximately half the height of the housing. Electric filter.   The dust collecting plate (3) composed of the upper partial plate (3a) and the lower partial plate (3b) forms a whole plate wall (4), and the plate wall (4) 4. The electrostatic filter according to claim 1, wherein the electrostatic filter is struck by a striking rod (8) driven only on one side. 5.   The dust collecting plate (3) consisting of an upper partial plate (3a) and a lower partial plate (3b) is guided by a single hammer rod (8). The electrostatic filter according to claim 1.   A plurality of reinforcing rings (1) are arranged one after the other in the longitudinal direction in the housing, and one field (2) of the dust collecting plate is arranged between two reinforcing rings (1). The electrostatic filter according to any one of claims 1 to 5.   The electrostatic filter according to claim 6, wherein at least one of the reinforcing rings (1) is formed rotationally asymmetric.   The support frame (7) for accommodating the lower partial plate (3b) supported in a standing manner is accommodated in the lower section of the reinforcing ring (1). Electrostatic filter.   The lower section (1b) of the reinforcing ring (1) has a weakened cross-sectional profile compared to the upper section (1a). Electrostatic filter.   10. The reinforcement ring (1) according to any one of claims 6 to 9, wherein the reinforcement ring (1) comprises a tensile material (10), which is arranged in particular in the range of the diameter in the horizontal direction. The electrostatic filter according to item 1.   The electrostatic filter according to claim 10, wherein the tensile material is formed as a lattice frame.   The electrostatic filter according to claim 10 or 11, wherein the tensile material (10) is formed as a walkable path.

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