JP5553895B2 - Electrostatic filter - Google Patents

Description

  The invention provides an electrostatic filter of the type described in the superordinate concept of claim 1, ie a housing with at least a substantially circular cross section, which guides the 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. A plurality of extending passages, each having at least one electrode frame disposed in at least some of the passages, the electrode frame comprising a plurality of elongated electrodes, The present invention relates to an electrostatic filter of a type in which particles guided in a gas flow are separated on a dust collecting plate by applying a high voltage to an electrode.

  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. . Such a discharge electrode stretched on the frame is formed as a wire and receives a corresponding mechanical stress when the temperature changes. In addition to the possibility of breaking the electrode wire that may cause a short circuit, the electrode frame may be further distorted by mechanical stress. This distortion also causes a disadvantage that the distance between the electrode frame to which a high voltage is applied and the adjacent dust collecting plate is changed. In the actual operation of the electrostatic filter having such a structure, when the electrode wire is broken, it is often the case that only the individual electrode wire that has been broken is removed because maintenance is troublesome. The performance of a simple electrostatic filter will be reduced in stages until complete maintenance is performed.

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

  According to the present invention, according to the invention, in the electrostatic filter of the type mentioned at the outset, the features according to the features of claim 1, i.e. the electrodes are fixed only on the support beam provided on the electrode frame. Is solved.

  By fixing the electrode only at one position of the support beam of the electrode frame, it is not necessary to tighten or tension the electrode, so that even in the case of a larger temperature change, the corresponding mechanical expansion of the electrode frame will eventually occur. In some cases, electrode damage and frame distortion are avoided. In a particularly advantageous embodiment of the invention (but not limited to this), the electrodes protrude downwards and upwards from the support beam. This makes it easy to adapt to a housing structure having a substantially circular cross section.

  The main use area is dust removal of 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 can lead to dust impacts that impair 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, the electrode is formed in a shape-rigidity (a shape that increases rigidity) with self-supporting properties at least in the vertical direction, so that it is easy to tighten or tension the electrode. Can be made unnecessary. In an advantageous embodiment (not necessarily limited to this), the electrode is, for example, a tube-shaped discharge electrode known per se, as an electrode having a square cross section or as an electrode having a cross-shaped cross section. It may be formed.

  In general, it is advantageous if the electrode frame has at least one further stiffening beam in addition to the support beam, so that the electrode frame obtains better support. In a particularly advantageous embodiment, the electrode is guided in a stiffening beam, but in this case the electrode is not fixedly attached to the stiffening beam. This avoids over-swinging or mechanical distortion of the electrode without having multiple points of fixed position that cause mechanical stresses over the length of the electrode during large thermal stresses. it can.

  In a generally advantageous embodiment, at least some of the electrode frames are located at their positions in the substantially circular cross section of the housing in order to take advantage of the configuration space provided in the housing of the circular cross section. There are different heights associated with each other.

  In order to take advantage of the width of the housing by means of a simple means to fill with the electrode and the dust collecting plate, the support beam is spaced in the height direction from the upper and lower ends of the housing, respectively, as the diameter of the housing cross section. It is advantageous to have a distance corresponding to at least 1/4, particularly preferably at least 1/3.

  In general, the support beam is preferably formed as a beating rod for the electrode frame. This makes it possible to easily hit the electrode for dust removal. However, on the basis of the support of the electrode according to the invention, it is usually sufficient to hit the hammered rod only from one side.

  In a simple and effective arrangement of the electrostatic filter according to the invention, the support beams of a number of electrode frames have at least two, in particular exactly two cross members (transverse supports) arranged one after the other in the longitudinal direction. ) And is held by the cross member. In an advantageous refinement, the cross member is mounted in the housing via an electrical insulator. In this case, it is particularly advantageous if the cross members are each suspended on the reinforcing ring of the housing. Such a reinforcing ring is known in particular in the construction of electrostatic filters having a circular cross section, in which case a plurality of dust collecting plates and a plurality of electrode frames are respectively provided between the two reinforcing rings of the housing. One field is arranged.

  In a generally advantageous embodiment, at least two of the electrode frames are joined to one another laterally via free-floating positioning girders, and in an advantageous embodiment, they are viewed in the longitudinal direction. Are connected in front of and / or behind the field of the dust collecting plate. Such a positioning girder reduces the relative swing of the individual electrode frames by simple means without significantly increasing the weight or construction effort.

  Further advantages and features of the invention are apparent from the embodiments described below and from claim 2 onwards.

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

It is the figure which looked at the electrode frame of the electrostatic filter by this invention from the side in the state without the inserted electrode. It is the figure which looked at arrangement | positioning of the electrode frame shown in FIG. 1 from the end surface side in the state in which the electrode was inserted.

  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 two or more reinforcing rings (not shown) spaced apart from each other in the longitudinal direction L. These reinforcing rings serve primarily to support the housing and secondly to hold a plurality of dust collecting plate fields (dust collecting plate areas). Furthermore, a plurality of electrode frames 1 are attached to the reinforcing ring. These electrode frames 1 are fixed in parallel to each other on a cross member 2 extending through the housing in the lateral direction. The position of the cross member 2 is fixed by one end range of the support beam 3 of each electrode frame 1. In this case, each end range of the support beam 3 is mounted on one of the two cross members 2 and is fixed to the cross member 2 by another means.

  In addition to the support beam 3 extending in the longitudinal direction L of the housing, the electrode frame 1 includes two vertical beams 4 extending in the vertical direction or the height direction H and a vertical parallel to the support beam 3 in the longitudinal direction L. A plurality of other stiffening beams 5 extending between the beams 4 are provided. Since the stiffening beam 5, the vertical beam 4, and the support beam 3 are fixed to each other in a fixed position, a single ladder-like frame is formed (see FIG. 1).

  The electrode frame 1 in the form of a ladder frame is attached to the cross member 2 via the end range of the support beam 3. The cross member 2 itself is suspended by a vertical anchor 6 via a insulator 7 on a reinforcing ring (not shown) of the housing. A voltage is applied to the entire electrode frame 1 during operation. In this case, an adjacent dust collecting plate (not shown) is grounded.

  The electrode frame 1 shown in FIG. 1 is shown without attached electrodes for the sake of clarity of the drawing. In order to attach the electrodes, the support beam 3 is shown with a corresponding attachment 3a. In particular, as can be seen from the cross-sectional view of FIG. 2, the electrode 8 fixed only at the attachment portion 3a of the support beam 3 of the electrode frame 1 protrudes vertically from the support beam 3 both upward and downward. These electrodes 8 are guided to the stiffening beam 5 by, for example, a plurality of holes or longitudinal slits arranged in the stiffening beam 5. The position of the stiffening beam 5 is not fixed. In the illustrated embodiment, the electrode 8 protrudes beyond the end of the electrode frame 1 in the height direction, so that particularly good utilization of the cylindrical space through which the gas flows is obtained.

  FIG. 2 shows a view of the entire device comprising the cross member 2 and the electrode frame 1 suspended from a housing (not shown) of the electrostatic filter as viewed from the end face side. In the figure, a free-floating position fixing cross 9 is shown. Each of the position-fixing cross beams 9 couples several electrode frames 1 to each other, thereby preventing the electrode frames 1 from swinging in directions away from each other during operation of the electrostatic filter. The dust collecting plate extending between the electrode frames 1 of this electrostatic filter is not shown. Free passages remain between the dust collecting plates that are aligned parallel to each other, and the electrode frame 1 is disposed in these passages.

  In this case, the electrode 8 is formed as a tubular discharge electrode. In particular, the electrode 8 has a cross section that is sufficiently large to be held in a shape-rigid shape (a shape that increases rigidity) with self-supporting properties at least in the illustrated vertical direction. There is no clamping or tensioning of the electrode over the length of the electrode. Moreover, it is not necessary to equip the electrode 8 extending downward from the support beam 3 with a weight. This is because such an electrode 8 is formed on the one hand in a shape-rigidity (a shape that increases the rigidity) and guided on the stiffening beam 5 on the other hand.

  In order to knock down the particles deposited on the electrode frame 1 and the electrode 8, each support beam 3 is hit using a hammer shaft and a hammer by a mechanism known per se. In this case, based on the structure of the present embodiment, it is sufficient to strike the support beam 3 only from one side. But of course you can also set the hit from both sides.

  As can be seen from the scale drawing shown in FIG. 2, the cross member 2 corresponds to at least about 1/3 of the overall diameter of the substantially circular housing from the upper end of the housing (not shown) in the height direction H. It is arranged at intervals of such a size. As a result, the cross member 2 is formed in the lateral direction Q to have a length sufficient to accommodate a large number of electrode frames 1 parallel to each other and to optimally use the housing width. As a result, the cross member 2 has a sufficient length in the lateral direction Q to accommodate a large number of electrode frames 1 parallel to each other and to optimally use the housing width. As can be seen directly from FIG. 2, the electrode frame 1 has various heights depending on the arrangement in the lateral direction Q. In this case, a total of three types of configuration heights of the electrode frame 1 are set. . The stepping of the length of the inserted electrode 8 as a function of the position in the transverse direction Q is much more than the stepping of the frame height in order to make optimal use of the construction space of the electrostatic filter for particle separation. It is finely formed.

Claims (12)

An electrostatic filter for dust removal from a converter gas in a gas purification facility alternately flowed by combustible converter gas containing dust and ambient air containing relatively light dust, A housing is provided with a section of circular cross section, which section serves to conduct a gas flow guiding the particles in a longitudinal direction (L) perpendicular to the cross section, within the housing. A number of dust collecting plates are disposed, the dust collecting plates being oriented parallel to each other to form a plurality of longitudinally extending passages, and in at least some of the passages, At least one electrode frame (1) is disposed, and the electrode frame (1) includes a number of elongated electrodes (8). By applying a high voltage to the electrodes (8), Flow In the electrostatic filter of the type in which the guided particles are separated on the dust collecting plate, the position of the electrode (8) is fixed only to the support beam (3) provided on the electrode frame (1). Electrostatic filter characterized by being made.   The electrostatic filter according to claim 1, wherein the electrode (8) protrudes downward and upward from the support beam (3).   The electrostatic filter according to claim 1 or 2, wherein the electrode (8) is formed so as to have shape rigidity with self-supporting property at least in a vertical direction.   4. The electrostatic filter according to claim 3, wherein the electrode (8) is formed as a tubular discharge electrode, as an electrode having a square cross section, or as an electrode having a cross-shaped cross section. Electrode frame (1) it is, in addition to the support beam (3) has at least one further stiffening beam (5), and pre-Symbol electrode is guided to該補rigid beam (5), 5. The electrostatic filter according to claim 1, wherein the position of the electrode is not fixed to the stiffening beam.   6. The electrode frame according to claim 1, wherein at least some of the electrode frames (1) have different heights relative to their position in the substantially circular cross section of the housing. The electrostatic filter according to item 1. Support beam (3) is, as the interval from the upper and lower ends of the respective height direction (H) a housing, and has a distance corresponding to at least 1/4 of the diameter of the housing cross-section, according to claim 1 The electrostatic filter of any one of Claim 6.   8. The electrostatic filter according to claim 1, wherein the support beam (3) is formed as a beating rod for the electrode frame (1). Support beams of a number of electrode frames (1) (3), extend between the at least two click Rosumenba arranged one behind in the longitudinal direction (2), held by the cross member (2) The electrostatic filter according to any one of claims 1 to 8.   10. The electrostatic filter according to claim 9, wherein the cross member (2) is mounted in the housing via an electrical insulator (7).   11. The electrostatic filter according to claim 10, wherein the cross members (2) are each suspended from the reinforcing ring of the housing. At least two electrodes frame of the electrodes frames (1) (1) is coupled to each other in the transverse direction via a free floating position fixing the crossbeam (9), viewed in the long side direction (L) The electrostatic filter according to claim 1, wherein the electrostatic filter is coupled before and / or behind the field of the dust collecting plate.

Images