DE102021206742A1 - Electrostatic precipitator - Google Patents

Abstract

The present application relates to an electrostatic precipitator (1), comprising a hollow-shaped insulating body (3) arranged in a housing (2) of the precipitator (1) and connected at its lower end to a protective tube (8) which extends into a chamber (6) of the separator (1), the separator (1) having a ring device (9) arranged between the hollow-shaped insulating body (3) and the protective tube (8) which has a plurality of individual slot nozzles (10) arranged around the circumference comprises, through which a cleaning gas can flow into the chamber (6) of the separator (1).

Description

The present invention relates to an electrostatic precipitator, comprising a hollow-shaped insulating body which is arranged in a housing of the precipitator and which is connected at its lower end to a protective tube which opens into a chamber of the precipitator.

Electrostatic precipitators are known in principle from the prior art. This is what the document reveals UK888,953 a generic electrostatic precipitator which has a hollow-shaped insulating body arranged in a housing of the precipitator. A cylindrical ring element is arranged at the lower end of the insulating body and opens into a cylindrical protective tube. During operation, a protective gas is introduced via inlet openings in a cover plate of the insulating body, which is intended to prevent the inflow of a gas contaminated with dirt particles from the deposition chamber. However, the undirected gas flow of the protective gas causes turbulence in such a cylindrical protective tube and thus the dirt particles are transported upwards into the insulating body, which are then deposited on the inner wall of the insulating body.

In order to prevent the development of turbulence, the disclosure document proposes DE 29 14 241 A1 proposes a protective tube for an insulating body of an electrostatic precipitator, which is convex in shape. The specific shape of the protective tube is also intended to prevent a contaminated gas from flowing from the deposition chamber into the interior of the insulating body.

In practice, however, it has been shown that the previous design variants known from the prior art cannot effectively prevent dirt particles from being deposited in the insulating body.

The present invention is therefore based on the object of providing an improved electrostatic precipitator, in particular providing an electrostatic precipitator whose protective tube prevents the upward transport of a gas contaminated with dirt particles from the separation chamber and a deposit of dirt particles on the inner wall of the protective tube.

Description of the invention

According to the invention, the object is achieved by an electrostatic precipitator having the features of patent claim 1.

The electrostatic precipitator according to the invention comprises a hollow-shaped insulating body which is arranged in a housing of the precipitator and which is connected at its lower end to a protective tube which opens into a chamber of the precipitator. The separator is characterized in that it has a ring device arranged between the hollow insulating body and the protective tube, which comprises a plurality of individual slit nozzles arranged around the circumference, through which a cleaning gas can flow into the chamber of the separator.

The several individual slit nozzles arranged around the circumference generate a uniform flow of cleaning gas directed in the direction of the separator chamber over the entire cross-sectional area of the protective tube, so that penetration of the dirt particles into the interior of the insulating body is effectively prevented. Due to the fact that the flow is directed downwards, the inner wall of the protective tube is also continuously flushed with the cleaning gas, so that a deposit of dirt particles on the inner wall of the protective tube is also effectively prevented.

Further advantageous refinements of the invention are specified in the dependently formulated claims. The features listed individually in the dependent claims can be combined with one another in a technologically meaningful manner and can define further refinements of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, with further preferred configurations of the invention being presented.

In the context of the present invention, the cleaning gas is understood to be an inert gas. The cleaning gas is therefore advantageously selected from the series comprising nitrogen, argon, carbon dioxide, lean air and/or mixtures thereof. The term “lean air” is understood by the person skilled in the art to mean an air mixture of air and carbon monoxide which has a reduced proportion by volume of oxygen, preferably an oxygen proportion of less than 2.0% by volume. The cleaning gas is particularly preferably nitrogen, since this increases the dielectric strength.

In a minimum configuration, the ring device has the multiple circumferentially disposed single slot nozzles in only one vertical plane. As an alternative and/or in addition, the ring device can have the plurality of individual slit nozzles arranged over the circumference in two, three or more vertical planes. The single slot nozzles can then be vertical to each other and be arranged in a row or offset to one another.

In a further advantageous embodiment variant, the several individual slit nozzles arranged over the circumference can be connected to form a continuous slit nozzle, so that the ring device then comprises at least one ring-shaped slit nozzle extending over the entire circumference in a minimal configuration. Alternatively and/or additionally, the ring device can comprise several of these slotted nozzles, which are then arranged in two, three or more vertical planes of the ring device.

The at least one or more annular slot nozzles and/or each of the plurality of individual slot nozzles is/are aligned at an angle of 5 to 85°, preferably at an angle of 20 to 50°, relative to the horizontal. This creates a further improved, directed, uniform flow of the cleaning gas over the entire cross-sectional area of the protective tube in the direction of the separator chamber.

character list

• 1 eine Ausführungsvariante des erfindungsgemäßen elektrostatischen Abscheiders,
• 2 eine Ausführungsvariante der Ringvorrichtung in einer perspektivischen Darstellung, und
• 3 die in 2 gezeigte Ausführungsvariante der Ringvorrichtung in einer Schnittdarstellung.

The invention and the technical environment are explained in more detail below with reference to the figures. It should be pointed out that the invention should not be limited by the exemplary embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description and/or figures. In particular, it should be pointed out that the figures and in particular the proportions shown are only schematic. The same reference symbols designate the same objects, so that explanations from other figures can be used as a supplement if necessary. Show it:

• 1 a variant of the electrostatic precipitator according to the invention,
• 2 a variant embodiment of the ring device in a perspective view, and
• 3 in the 2 shown variant of the ring device in a sectional view.

In 1 an embodiment variant of the electrostatic precipitator 1 according to the invention is shown in a partial sectional illustration. On the one hand, a housing 2 can be seen, in which a hollow-shaped insulating body 3 is arranged. The insulating body 3 is made of an electrically non-conductive material, such as porcelain or a ceramic, and is conical in shape in the present case. At its upper end, the insulating body 3 has a cover element 4 on which a rod-shaped electrode 5 is arranged in a hanging manner. The electrode 5 extends into a chamber 6 of the electrostatic precipitator 1, which is only indicated with the reference number 6 in the present case.

The housing 2 of the electrostatic precipitator 1 has an annular base element 7 at its lower end, from which a protective tube 8 also extends into the chamber 6 . According to the invention, the electrostatic precipitator 1 has a ring device 9 between the hollow insulating body 3 and the protective tube 8 the chamber 6 of the separator 1 can be inflowed (see 2 and 3 ). The cleaning gas, for example nitrogen, is fed to the ring device 9 via a feed line 11 .

The ring device 9 is described below with reference to the 2 and 3 explained in more detail. In the 2 the ring device 9 is shown in a perspective view, with a ring segment being cut out.

The ring device 9 comprises an outer ring-shaped gas chamber 12, which in the present case is divided into two and is therefore formed from two semicircular segments 13 (see Fig 3 ). Each of the two outer segments 13 is fluidically connected to the feed line 11 via an opening 14 . Furthermore, the ring device 9 comprises an inner ring-shaped gas chamber 15 which is divided into four inner segments 16 in the present case. Both gas chambers 12, 15 are separated from one another by a partition wall 17. Four openings 18 are provided in the partition wall 17, via which a fluidic connection between the outer and inner gas chambers 12, 15 or the respective segments 13, 16 is formed. Furthermore, the ring device 9 has a plurality of webs 19 which are arranged between the individual slot nozzles 10 and which circumferentially separate the plurality of individual slot nozzles 10 from one another.

The present plurality of single slot nozzles 10 are each aligned at an angle of 40° with respect to a horizontal.

Reference List

1

electrostatic precipitator

2

Housing

3

insulator

4

cover element

5

electrode

6

chamber

7

floor element

8th

protective tube

9

ring device

10

single slot nozzles

11

supply line

12

outer gas chamber

13

outer segments

14

opening

15

inner gas chamber

16

inner segments

17

partition wall

18

openings in the partition wall

19

webs

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• GB888953 [0002]
• DE 2914241 A1 [0003]

Claims (7)

Electrostatic precipitator (1), comprising a hollow-shaped insulating body (3) arranged in a housing (2) of the precipitator (1) and connected at its lower end to a protective tube (8) which extends into a chamber (6) of the precipitator (1), characterized in that the separator (1) has a ring device (9) which is arranged between the hollow-shaped insulating body (3) and the protective tube (8) and which comprises a plurality of individual slit nozzles (10) arranged over the circumference, via which a cleaning gas can flow into the chamber (6) of the separator (1). Electrostatic precipitator (1) after claim 1 , wherein the ring device (9) comprises at least one annular slot nozzle extending over the entire circumference. Electrostatic precipitator (1) after claim 1 or 2 , wherein the at least one ring-shaped slot nozzle, or each of the plurality of individual slot nozzles (10) is aligned at an angle of 5 to 85 ° based on a horizontal. Electrostatic precipitator (1) according to one of the preceding claims, wherein the ring device (9) has a ring-shaped gas chamber (12, 15) which is fluidically connected to the at least one ring-shaped slot nozzle, or each of the plurality of individual slot nozzles (10), preferably directly , connected is. Electrostatic precipitator (1) according to one of the preceding claims, in which the ring device (9) is connected in a fluid-tight manner to the lower end of the hollow-shaped insulating body (3), preferably via its end face. Electrostatic precipitator (1) according to one of the preceding claims, wherein the ring device (9) has at least one gas connection for the cleaning gas. Electrostatic precipitator (1) according to one of the preceding claims, in which the hollow-shaped insulating body (3) has a conical or cylindrical shape.

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