CN2205248Y

CN2205248Y - High efficiency static dust separator

Info

Publication number: CN2205248Y
Application number: CN 94221875
Authority: CN
Inventors: 郑天安
Original assignee: ZHENG TIAN AN
Current assignee: ZHENG TIAN AN
Priority date: 1994-09-13
Filing date: 1994-09-13
Publication date: 1995-08-16
Anticipated expiration: 2004-09-13

Abstract

The utility model relates to a high efficiency static dust remover. A dust collecting pole plate arranged in the operating chamber of the dust remover forms a dovetail groove shape. A set of auxiliary electrodes is transversely arranged along the flowing direction of fume between adjacent corona poles. The dust remover simultaneously has high corona intensity and high and uniform electric field intensity, and the dust removing efficiency of the utility model is increased.

Description

High efficiency static dust separator

The utility model belongs to environmental technology field, relate generally to a kind of can be in the coal-burning power plant or the electrostatic precipitator that is used for gas purification of other Industrial Stoves configuration.

Electrostatic precipitator is the cleaner that is provided with dust collector pole (positive pole) plate and corona discharge electrode (negative pole) in a kind of operating room.Its operation principle is to cause suitable non-uniform electric field with negative extra-high voltage direct-current power supply, utilize the corona discharge of this electric field, make electric charge on the dust in flue gas particle band, by electric field force (Coulomb force) these charged dust are shifted onto on the dust collecting pole plate then, at last by the mode of mechanical vibrator, make the dust stratification layer from the sur-face peeling of dust collecting pole plate and fall in the ash bucket of electrostatic precipitator bottom and discharge.

The most basic course of work of electric precipitation is the charged process of dust, and dust only by after fully charged, could obtain a driving force that moves towards dust collecting pole plate under the effect of electric field force.This driving force is to make one of principal element that dust separates from air-flow, and it is directly proportional with the size and the electric-field intensity of dust charge electric weight.

But the process of gathering dust of the charged process of dust and deduster is again the process of a pair of contradiction each other.The corona intensity that charged needs are stronger, make gas ionization, dust could obtain electric charge sufficiently like this, and the process of gathering dust does not need stronger corona intensity, what it required is higher and uniform electric-field intensity, so that charged dust can be pushed on the dust collecting pole plate rapidly.In the ordinary course of things, the physicochemical property of various dust that enters the deduster operating room is all inequality, and also difference to some extent of required corona intensity and electric-field intensity when it is carried out dedusting especially is in less than 10 when dust specific resistance ⁴Ω-cm and greater than 10 ¹²During the polarization situation of Ω-cm, dust is charged just to seem more outstanding in the contradiction aspect corona current and the electric-field intensity with gathering dust.

In the electrostatic precipitator of routine, dust collecting pole plate and the corona discharge electrode set-up mode in the operating room is vertical disposed at equal distance along the flue gas inflow direction, may obtain higher corona intensity like this.Because flowing into the electron ion that is produced after the interior gas of deduster is ionized is not negative ion entirely, in normal dust removal process, electronegative dust major part is collected by dust collecting pole plate, the positively charged dust of a part then moves to the corona discharge electrode direction, is received long-pendingly by corona discharge electrode, and another part and anion institute comprehensively, become neutral ion, then in electric field by further charged, if positively charged dust is more for a long time, will be rolled into corona wire bar-shaped or amasss into grey knurl.Then will produce corona blocking if there is not timely vibration dust-cleaning this moment, and the supplied character of electric cleaner is descended, and may directly threaten the normal operation of electric cleaner like this.Under can effectively that part is positively charged dust collection in same operating room, prior art have also adopted the frame mode of setting up auxiliary electrode in the original corona discharge electrode of deduster system.The operation principle structure of this equipment is as shown in Figure 1: be provided with some groups and be dust collecting pole plate 2 and the corona discharge electrode 3(that vertical equidistant row puts along the flue gas inflow directions and form the multichannel gas channel in deduster operating room 1), between every adjacent corona polar line 3, be provided with one group of auxiliary electrode 4, auxiliary electrode 4 and corona discharge electrode 3 equipotentials, its set-up mode also set-up mode with corona discharge electrode 3 is identical, for vertically being provided with along the flue gas inflow direction.The electric cleaner of band auxiliary electrical polar form can be considered two-region type electric cleaner, from see it in form the charging area of dust is separated with collecting region, and plays the effect of collecting the positive charge dust simultaneously.But because auxiliary electrode 4 also vertically is provided with for suitable flue gas inflow direction in the prior art, identical to the pole span of dust collecting pole plate 2 by its pole span (heteropole apart from) with corona discharge electrode 3 to dust collecting pole plate 2, so it also can not solve most effectively and makes electric cleaner have the higher corona intensity and the problem of stronger and uniform electric-field intensity simultaneously.The shape of the dust collecting pole plate 2 in the conventional in addition electrostatic precipitator is more smooth, is unfavorable for that charged dust in the adhering to of dust collecting pole plate surface, easily produces reentrainment of dust, and the efficiency of dust collection of equipment is reduced.

The purpose of this utility model is according to the existing existing defective of electrostatic precipitator product, and a kind of high-efficiency electrostatic dust remover that can satisfy the charged novel structure with the two kinds of requirements of gathering dust of dust in high quality simultaneously is provided.

In order to realize above-mentioned goal of the invention, the utility model designer has mainly made 2 improvement to prior art: the first is changed system into dovetail groove shape with the shape of dust collecting pole plate 2, like this at identical heteropole under condition, the effective area that gathers dust of dust collecting pole plate can increase about 20%; It two is that the form that is provided with auxiliary electrode 4 changes into along flue gas inflow direction horizontally set.Through after the above improvement, utilize the combination anyway of dovetail groove shape dust collecting pole plate, charging area (contraction section) and dust collection section (diffuser) two class zones (referring to label in the accompanying drawing 25,6) will be divided in the deduster passage, corona discharge electrode 3 is arranged in charging area, and horizontal auxiliary electrode 4 is arranged in dust collection section, and the two also can be changed according to the condition of the physicochemical property of different dust.In deduster, the charging area and the dust collection section stagger arrangement of each road gas passage and adjacent gas passage are arranged, in each electric field length zone, unit, just formed multiunit charging area and dust collection section like this.The charging area 5 of this deduster has stronger corona intensity, and it is stronger and sufficient charged that dust is obtained; And in dust collection section 6,, be difficult for producing corona discharge in the zone of gathering dust, thereby this regional electric-field intensity is increased because the radius of curvature of horizontal auxiliary electrode 4 is bigger; Again because dust collection section also is subjected to induction from the corona discharge electrode field intensity of two adjacent passages, the electric-field intensity that so just makes dust collection section more Gao Binggeng becomes evenly, so can reach the purpose that charged dust is collected rapidly; Simultaneously because horizontal auxiliary electrode 4 is equipotential negative high voltage systems with corona discharge electrode 3, make the also dust of collecting belt positive charge effectively of deduster.In addition, have a groove in the structure because of dust collecting pole plate 2 and horizontal auxiliary electrode 4 is complementary, it can control the generation of reentrainment of dust again well, and also has and be beneficial to machinery and separate and collect the collision dust and prolong the effects such as the time of staying of dust in electric field.

Below with reference to accompanying drawing the utility model content is described further.

Fig. 1 is the structural representation of state of the art product.

Fig. 2 is the structural representation of a specific embodiment of the utility model.

As shown in Figure 2, in the operating room 1 of this high-efficiency electrostatic dust remover, form the dust collector pole system along the flue gas inflow direction by polylith dovetail groove shape dust collecting pole plate 2, the dust collector pole system is divided into charging area 5 and dust collection section 6 again; In each charging area unit, match comparatively ideal corona discharge electrode 3 and one group or a horizontal auxiliary electrode 4 are installed according to different dust physicochemical properties, form multichannel electric cleaner at the dust collection section central part.The wide A in upper plate outer of every dovetail groove type dust collecting pole plate 2 is 385～750mm, dovetail groove bottom width B is 0.35～0.7A, the dark C of groove is 0.1～0.2A, angle α is 45～115 ° in the dovetail groove, wherein, the utmost point of choosing the physicochemical property of mainly considering dust and the corona discharge electrode relation of joining of wide B of bottom land and interior angle α value is complementary.Horizontal auxiliary electrode 4 is installed in the centre of each dust collection section unit, and direction is set for it and operating room's flue gas inflow direction intersects by 45～90 ° of angles (θ angle), and choose and the dovetail groove interior angle value and the corona discharge electrode pattern at θ angle are complementary; In concrete the enforcement, the planform of auxiliary electrode 4 can be made into straight-plate-type, wave or pipe row formula.

High-efficiency electrostatic dust remover device described in the utility model can be widely used in the gas purification aspect of all types of industries kilns such as the flue gas ash removal of large, medium and small capacity boiler of coal-burning power plant and metallurgy, building materials, chemical industry, is particularly suitable for using in the production environment and the area of those environmental protection requirement strictnesses.Compared with prior art, this device especially contrasts resistance and is in less than 10 the physicochemical property wide accommodation of dust ⁴Ω-cm and greater than 10 ¹²The dust of the two poles of the earth situation of Ω-cm has excellent adaptability.Technology of the present utility model is simple, easy construction, has obvious social and economic benefit.

Claims

1, a kind of high-efficiency electrostatic dust remover, has an operating room (1) and some suitable flue gas inflow directions that is mounted in the operating room (1) are dust collecting pole plate (2) and the corona discharge electrode (3) that vertical equidistant row puts, between every adjacent corona discharge electrode (3), be provided with one group of auxiliary electrode (4), it is characterized in that:

1.1 dust collecting pole plate (2) be shaped as dovetail groove shape;

1.2 the form that is provided with of auxiliary electrode (4) is suitable flue gas inflow direction horizontally set.

2, high-efficiency electrostatic dust remover as claimed in claim 1, the wide A in upper plate outer that it is characterized in that dovetail groove type dust collecting pole plate (2) is 385～750mm, dovetail groove bottom width B is 0.35～0.7A, and the dark C of groove is 0.1～0.2A, and angle α is 45～115 ° in the dovetail groove.

3, high-efficiency electrostatic dust remover as claimed in claim 1 is characterized in that be provided with direction and operating room's flue gas inflow direction of auxiliary electrode (4) intersects by 45～90 ° of angles.

4, high-efficiency electrostatic dust remover as claimed in claim 1, the planform that it is characterized in that auxiliary electrode (4) is a straight-plate-type.

5, high-efficiency electrostatic dust remover as claimed in claim 1, the planform that it is characterized in that auxiliary electrode (4) is a wave.

6, high-efficiency electrostatic dust remover as claimed in claim 1 is characterized in that the planform of auxiliary electrode (4) is pipe row formula.