DD215479A2 - DESIGN OF SHEET OR STRIPE FERROUS LOW HAZARD ELECTRODES FOR HORIZONTAL ELECTRIC SEPARATORS - Google Patents

Abstract

The invention relates to the design of plate or streifenfoermigen precipitation electrodes for Elektroabschneider with horizontal gas passage through the form-stabilized V-shaped webs, the d. Tip of the bridge have a gutter, which has a concave kink in the middle, can be made against rotation. This is ensured by the fact that all angles at V-shaped web are the same size and during deformation no different residual stresses caused by work hardening. Except the very good stacking and transportability reduces the assembly costs.

Description

Title of the invention

Design of plate-shaped or strip-shaped collecting electrodes.

Field of application of the invention

The invention relates to the design of plate or st ripe EnfÖrmiger collecting electrodes for electrostatic precipitator with horizontal gas passage.

Characteristic of the known technical solutions

There are plate or strip-shaped collecting electrodes for electrostatic precipitator with horizontal gas passage known and described in the DD-WP 118 234 and the main patent DD-WP (official file number WP B OJ G / 229 379/3), which in cross section on both sides and alternately symmetrical arranged and symmetrically formed V-shaped bars have »

In each case between two in-plane V-shaped webs is a low-flow dust collecting chamber whose length to the height · of the web in DD-TO 118 234 in any and in the main patent DD-WP 1SSOO3, official file reference B 03 0/229 379 / 3, in a defined ratio. The lateral termination of the collecting electrode is realized in the main patent by a double web, the amplitude of which has a different height, and which ends in a definite edge strip lying in the median plane.

In addition, web formers for plat tenf örmige precipitation electrodes are known and described in GB patent 1 145 770, which are formed box or trapezoidal ·

The in the main pat ent DD-WP 15% 007) (official file number WP B 03 0/229 379/3) and the DD-WP 118 234 executed Vf örmigen. Webs have 'at the top of the web a bending angle much smaller 90 °, whereas at the base of the web

shaped ridge angle greater 9P ° arise. Due to the bending angle at the top of the web smaller than 90 °, the forming steps are determined during profiling. The disadvantage of this V-shaped web shape is that when profiling the collecting electrode at the top of the V-shaped web, caused by the rolling of the plate thickness im.Radius, - a higher work hardening than at the bending angles of the base of the V-shaped web , As a result of this unequal distribution of stress in the collecting electrode cross-section, twists and deviations from the straight line occur, which must be eliminated by a message from the collecting electrodes. In terms of deformation, when profiling for the angle <90 ° at the point of the V-shaped web there are more forming steps e, more than 90 °. Although the embodiment known in GB patent 1 145 770 with trapezoidal webs produces equal bending angles in the middle section of the cross-sectional profile, angles at the ends of the base of the trapezoidal web are <90 °, both by the bead shape and by the strip strip bent inward. which also have different strain hardening in the radii with respect to the fiadien in the middle piece and lead to uneven stress distribution over the entire profile Quersohnitt, so that twists and bulges of the collecting electrode * are the result. In addition, the stacking of the profiles one above the other by the inwardly curved sand strip eh questioned} and it is therefore a complex transport technology required. Another disadvantage of this cross-sectional shape is that the straight surfaces of the trapezoidal web are so wide that these surfaces, based on the length of the collecting electrode wall, significantly reduce the dust collecting space and thus reduce the separation efficiency. V

Object of the invention

The aim of the invention is to provide a plate-shaped or strip-shaped collecting electrode for horizontal electric cut-offs.

wrap, which has a high degree of dimensional stability at a high intrinsic stiffness in the longitudinal and transverse direction and with optimal profiling technology and reduces the assembly effort.

Explanation of the essence of the invention

The. The invention has for its object to find a strip or plate-shaped collecting electrode, which also has a high dimensional stability in both profile cross-section and in the longitudinal direction of the collecting electrode and thereby does not reduce the effective dust collecting spaces and flow-technically and electrically with optimum field line distribution vibrational , has technically good properties.

According to the invention the object is achieved in that the V-shaped web of the plate or strip-shaped low-impact electrodes at the top of the web has a folded-in intermediate piece.

This shaping, which for all precipitation electrode]! can be found with V-shaped webs application brings, in addition to the advantages listed in the main patent DD-WP 15ßOQ3 (official file number WP, B 05 0/229 379/3) and DDr-WP 118 234 according to the invention at the top of the, the web same bending angle as at the base of the web, so that the work hardening at all baths of the profile cross-section is the same and no impermissible voltage peaks occur that trigger a twisting effect of the collecting electrode. By limiting the length of the intermediate piece, the dust collecting chamber is substantially retained and additionally stabilizes the V-shaped web by the bent-in intermediate piece. Through the intermediate piece, the moment of inertia of the collecting electrode is substantially increased and the assembly costs are further reduced. Another advantage consists in the fact that in the manufacture of the collecting electrode according to the invention by profiling, conditionally equal bending angle in the profile cross-section, less forming steps are required and a

gentle bending process is ensured while the'Maßhaltigkeit the collecting electrode is increased.

embodiment

The invention will be explained in more detail below with reference to an example «The accompanying drawings show:

1s shows a cross section through the V-shaped web according to the invention;

! 'Ig. 2j shows a cross section through a collecting electrode according to DD-WP 118 254 with the V-shaped web according to the invention;

Figo Ji a cross section through a collecting electrode according to DD-WP sfzx003 (official file reference MP B 03 C / 229 579/3) with the V-shaped web according to the invention;

4 shows a cross section through a collecting electrode according to DD-WP (official file reference WP B 05 0/254 797-6, Fig. 1) with the V-shaped web according to the invention,

In Fig. 1 of the V-shaped land 1 of the invention is the plate- or strip-shaped collecting electrode 2 shown This V-shaped web 1 is provided at the tip 3 with an intermediate piece 4, which is about ^1/5 of the width of 5 the open side of Bridge is 1 long. In this intermediate piece 4, an inwardly directed concave bend 6 is arranged, which is about 1/5 of the length 7 of the intermediate piece 4 deep. The V-shaped web 1 preferably has the geometric shape of an isosceles to equilateral triangle, wherein the radii 8 in the base angle 9 and in the transition to the intermediate piece 4 are approximately equal and correspond to the depth 10 of the concave bend 6. The height 11 of the V-shaped web 1 is, as well as the base angle 9 »variable.

By the center located in the arranged in the top 3 of the V-shaped web 1 spacer 4 concave

Knick 6 is achieved by exploiting the resulting during rolling of the precipitation electrode 2 strain hardening in the region of the web tip 5 an increase in stability, whereby a reduction of the material thickness by about 20 % is possible. In addition, due to the broadening of the web 1 and the presence of two peaks improves the electrical behavior of the collecting electrode. 2

Claims (1)

invention claims 1. Design of plate-shaped or strip-shaped collecting electrodes for horizontal electrostatic precipitators Main patent DB-WP 158 OO3 ι. \ with mutually and symmetrically arranged, in each case between two in a plane adjacent, a dust collecting space forming, defined in height, V-shaped webs, wherein the outermost edge and lying in the same plane webs are formed so that the outer leg extends beyond the center out into the other plane is, so that a smaller, in its height defi ned web arises whose outer leg ends in a likewise defined narrow edge strip, characterized in that the V-shaped webs (1) are formed so that at the top (3 ) of the web (1) an intermediate piece (4) having a length (7) of about 1/5 of the width (5) of the open side of the V-shaped web (1) is arranged, that the intermediate piece (4) one after the center of the collecting electrode (2) directed concave bend (6) whose depth (10) amounts to about 1/5 of the length (7) of the intermediate piece (4) and that the radii (8) in the base angle (9) and in Transition to the intermediate piece (4) are approximately equal and correspond to the depth (10) of the concave bend (6). 2β Design of plate or strip-shaped collecting electrodes for Horizontalelektroabscheider, characterized in that the height (11) of the V-shaped web (1) and the base angle (9) are variable. For this 1 sheet drawings