CN110496707A - An electrostatic precipitator with a coulomb lens anode - Google Patents

Abstract

The present invention relates to an electrostatic precipitator with a Coulomb lens anode, which may include a housing and at least one Coulomb lens electric field arranged in the housing, and the Coulomb lens electric field is arranged alternately and at intervals along the smoke advancing direction There are multiple columns of cathodes and Coulomb lens anodes, and the channel between two adjacent Coulomb lens anodes is a flue gas flow channel, wherein the Coulomb lens anode has a relatively closed cavity around, and the lower end of the cavity is connected with a collector Dust hopper, the dust in the flue gas flow channel is charged by gas ionization, and the charged dust is trapped in the cavity under the action of Coulomb force of the electric field, and further condenses and settles or shakes off into the dust hopper. The invention can realize the complete separation of air flow and dust flow, effectively avoid secondary dust raising by rapping, greatly improve dust removal efficiency, and continuously meet ultra-low emission.

Description

An electrostatic precipitator with a coulomb lens anode

technical field

The invention belongs to the technical field of electrostatic dust removal, and in particular relates to an ultra-low-emission electrostatic dust collector with a Coulomb lens anode.

Background technique

High-voltage electrostatic precipitator is a device that collects dust in flue gas by electrostatic purification method. It has the advantages of high dust removal efficiency, low system resistance, reliability and durability, and is the most commonly used dust control technology among all dust removal technologies. A dust collector that uses the adsorption of charged dust by a high-voltage electric field to separate the dust from the dust-containing gas. That is, in the high-voltage electric field, the dust suspended in the dust-containing gas is charged by the ionization of the gas, and the charged dust moves to the electrode with the opposite polarity under the action of the Coulomb force of the electric field, and is adsorbed on the electrode. Vibrating, brushing, etc. make it fall off the surface of the electrode, and fall into the dust collector of the ash hopper under the action of gravity. However, since the closed C480 anode plate is generally used in active electrostatic precipitators, the flue gas dust is adsorbed on the surface of the C480 anode plate after charging, and still resides in the flue gas channel, as shown in Figure 7. The dust falling off the surface of the plate returns to the flue gas channel again, and escapes to the electric field of the rear stage or the outlet of the electrostatic precipitator under the influence of the air flow, generating secondary dust by vibration, causing instantaneous excessive emission, affecting the dust removal efficiency, and cannot meet the increasingly stringent new environmental protection regulations. Require.

Contents of the invention

The present invention aims to provide an ultra-low emission electrostatic precipitator to solve the above problems. For this reason, the concrete technical scheme that the present invention adopts is as follows:

An electrostatic precipitator with a Coulomb lens anode, the electrostatic precipitator includes a casing and at least one Coulomb lens electric field arranged in the casing, and the Coulomb lens electric field is arranged alternately and at intervals along the smoke advancing direction There are multiple columns of cathodes and Coulomb lens anodes, and the channel between two adjacent Coulomb lens anodes is a flue gas flow channel, wherein the Coulomb lens anode has a relatively closed cavity around, and the lower end of the cavity is connected with a collector Dust hopper, the dust in the flue gas flow channel is charged by gas ionization, and the charged dust is trapped in the cavity under the action of Coulomb force of the electric field, and further condenses and settles or shakes off into the dust hopper.

In one embodiment, the Coulomb lens anodes on both sides are composed of the side wall of the housing, an anode plate row and flow blocking plates at both ends, and the Coulomb lens anode in the middle is composed of anode plate rows on both sides and flow blocking plates at both ends .

In one embodiment, the cavity has a width of 100-300 mm, preferably 150 mm.

In one embodiment, the width of the channel between the two adjacent Coulomb lens anodes is 300-600 mm, preferably 450 mm.

In one embodiment, the inclination directions of two adjacent anode plate rows are opposite, and each anode plate row includes 6-10 transparent louvered coulomb anode plates, preferably 8 transparent louvered coulomb anode plates.

In one embodiment, each permeable louvered anode plate includes 8-15 louvered plates arranged at equal intervals, preferably 11 louvered plates.

In one embodiment, the width of the louver plate is 50-80mm, preferably 60mm.

In one embodiment, the inclination angle of the louvered plates is 30-60 degrees, preferably 45 degrees.

In an embodiment, the cross section of the blocking plate may be triangular, semicircular or square. Preferably square.

In one embodiment, the cathode is a BS prickly wire, adopting the double corona power supply mode of front and rear small partitions, two BS prickly wires are arranged corresponding to each transparent louvered Coulomb plate in the first half area, and each piece of BS prickly wire in the second half area The transparent louvered coulomb plate is correspondingly arranged with a BS prickly wire.

In one embodiment, the cathode adopts a top electromagnetic rapping structure, and the Coulomb lens anode adopts a top electromagnetic rapping structure or a side arm-wrapping hammer rapping structure.

In one embodiment, the electrostatic precipitator further includes two conventional electric fields and one horizontal rotating plate electric field, the two conventional electric fields are close to the flue gas inlet, the horizontal rotating plate electric field is close to the flue gas outlet, and the Coulomb lens The electric field is arranged between the conventional electric field and the horizontal rotating plate electric field.

The beneficial effects of the present invention are as follows:

1) When the flue gas dust enters the electric field, under the action of negative DC high voltage, the flue gas dust is quickly ionized into negatively charged dust particles. Under the action of the Coulomb force of the electric field, the two dust streams of two adjacent channels focus and move towards the anode of the Coulomb lens from both sides, and a large amount of dust passes through the channel of the louver plate and enters the relatively closed cavity of the anode of the Coulomb lens, focusing and colliding , Mix and condense into large particles of dust. Since there is no air flow in the cavity, the large particles of dust will settle by their own weight and fall into the dust collection hopper to realize dust collection. Moreover, due to the guiding effect and cross coverage of the louver plates, once the dust particles enter the anode cavity, they will not flow out in the reverse direction and escape into the airflow channel, realizing the complete separation of the airflow and dust flow.

2) A small part of the dust adsorbed on the louver plate is guided into the cavity by the angle of the louver plate during rapping, and falls into the ash hopper, which effectively avoids the secondary dust of rapping and greatly improves the dust removal efficiency. , continue to meet the new emission standards.

3) After the active electrostatic precipitator is transformed with the electrostatic precipitator with Coulomb lens anode of the present invention, the area of the dust collection plate is nearly doubled, which is particularly beneficial for the ultra-low emission transformation of the active electric precipitator with limited expansion space.

Description of drawings

To further illustrate the various embodiments, the present invention is provided with accompanying drawings. These drawings are a part of the disclosure of the present invention, which are mainly used to illustrate the embodiments, and can be combined with related descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should understand other possible implementations and advantages of the present invention. Components in the figures are not drawn to scale, and similar component symbols are generally used to denote similar components.

1 is a schematic diagram of an electrostatic precipitator with a Coulomb lens anode according to an embodiment of the invention;

Fig. 2 is the plan view of the electrostatic precipitator with Coulomb lens anode shown in Fig. 1;

Fig. 3 is the plan view of the Coulomb lens electric field in the electrostatic precipitator with Coulomb lens anode shown in Fig. 1;

Fig. 4 is the perspective view of the Coulomb lens anode of the Coulomb lens electric field shown in Fig. 3;

Fig. 5 is the perspective view of the see-through louver coulomb anode plate of the coulomb lens anode shown in Fig. 4;

Fig. 6 is the dust removal schematic diagram of Coulomb lens electric field;

Fig. 7 is a schematic diagram of dust removal in a conventional electric field.

Detailed ways

The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

Figures 1 and 2 show an electrostatic precipitator with a Coulomb lens anode according to an embodiment of the present invention, which may include a housing 1, four electric fields arranged in sequence along the flue gas flow direction, and a corresponding dust collector arranged at the lower end of each electric field Device (dust collecting ash hopper) 5. Among them, the first and second electric fields adopt the conventional C480 plate electric field 2, the third electric field adopts the Coulomb lens electric field 3, and the fourth electric field adopts the horizontal rotating plate electric field 4. The specific structures of the shell 1, the conventional C480 plate electric field 2, the horizontal rotating plate electric field 4 and the dust collection device 5 can be found in the Chinese utility model patent 208321093U of the same applicant of the present application, and will not be described here. It should be understood that the number of the above-mentioned various electric fields is not limited to the illustrated embodiment, but at least one Coulomb lens electric field 3 is included. The structure of the Coulomb lens electric field 3 will be described in detail below.

As shown in Figures 3 to 5, the Coulomb lens electric field 3 is alternately arranged with multiple columns of cathodes 31 and Coulomb lens anodes 32 along the flue gas advancing direction (the number is designed according to the size of the dust collector). Wherein, the cathode 31 is arranged in the middle of the channel between two adjacent Coulomb lens anodes 32 . The channel width between two adjacent Coulomb lens anodes 32 is 300-600 mm, preferably 450 mm. The Coulomb lens anode 32 has a relatively closed cavity 323, and the lower end of the cavity 323 is connected with a dust collecting hopper 5 (see Figs. 1 and 2). Specifically, the Coulomb lens anode 32 on both sides is composed of the housing side wall 11, an anode plate row 321 and blocking plates 322 at both ends, and the Coulomb lens anode 32 in the middle is composed of the anode plate row 321 on both sides and the blocking plates 322 at both ends. Flow plate 322 constitutes. The distance between the casing sidewall 11 of the Coulomb lens anode 32 on both sides and the anode plate row 321 or the two anode plate rows 321 of the Coulomb lens anode 32 in the middle (that is, the width of the cavity 323 ) is 100-300 mm, Preferably 150mm. Each anode plate row 321 can arrange 6-10 transparent louvered coulomb plates 3211 , preferably 8 transparent louvered coulomb plates 3211 . The frame of each transparent louvered coulomb anode plate 3211 is composed of a square tube 32111 and upper and lower hanging plates 32112 . Between the square tubes 32111, 8-15 louver plates 32113, preferably 11 louver plates 32113, are arranged at equal intervals. The width of the louver plate 32113 is 50-80 mm, preferably 60 mm; it forms an angle of 30-60 degrees with the plane of the plate frame, preferably 45 degrees. In this embodiment, each permeable louvered coulomb anode plate 3211 is also provided with several reinforcing ribs 32114 (four are shown) spaced apart in the height direction. The reinforcing rib 32114 can prevent the louver plate 32113 from being blown and deformed by the flue gas flow, thereby preventing the dust in the cavity from returning to the flue gas flow. The blocking plate 322 seals the anode plate row 321 from both ends, so that the flue gas flow can only flow through the passage between the adjacent two Coulomb lens anodes 32 (that is, the passage between the adjacent two Coulomb lens anodes 32 is the flue gas flow channel) and there is no air flow in the cavity. The cross section of the blocking plate 322 can be triangular, semicircular or square, preferably square.

In this embodiment, the cathode 31 is a BS prickly wire, and adopts the double corona power supply mode of the front and rear small partitions, in which two BS prickly wires are arranged corresponding to each transparent louvered Coulomb anode plate 3211 in the first half area, and each A transparent louvered coulomb anode plate 3211 is correspondingly arranged with a BS barbed wire, as shown in FIG. 3 .

In this embodiment, both the cathode 31 and the Coulomb lens anode 32 adopt a top electromagnetic rapping structure 33 , see FIG. 1 . Of course, the Coulomb lens anode 32 may also adopt a side-wound arm hammer vibration structure. It should be noted that both the top electromagnetic rapping structure and the side arm-wrapping hammer rapping structure are well known and will not be described here.

The working principle of the Coulomb lens electric field 3 is briefly described below, as shown in Figure 6, where the black dots in the figure represent dust. When the flue gas dust enters the Coulomb lens electric field 3, the flue gas dust is quickly ionized into negatively charged dust particles under the action of negative DC high voltage. Under the action of the Coulomb force of the electric field, the two dust flows of two adjacent channels focus and move toward the anode 32 of the Coulomb lens from both sides. This phenomenon is similar to the focusing effect of a lens on light, so this electric field is called the Coulomb lens electric field, and its anode is called the Coulomb lens anode accordingly. A large amount of dust passes through the gap between the louver plates 32113 and enters the relatively closed cavity 323 of the coulomb lens anode 32, focuses, collides, mixes and condenses into large particles of dust. Since there is no air flow in the cavity 323, the large particles of dust will It settles under its own weight and falls into the dust collecting hopper to realize dust collection. Moreover, due to the guiding effect and cross coverage of the louver plate 32113, once the dust particles enter the cavity 323 of the coulomb lens anode 32, they will not flow out in the opposite direction and escape into the flue gas flow channel, realizing the complete separation of the air flow and the dust flow. A small part of the dust adsorbed on the louver plate 32113 is guided into the cavity 323 of the coulomb lens anode 32 by means of the inclination angle of the louver plate 32113 when vibrating, and falls into the ash hopper, effectively avoiding secondary dust from rapping. Greatly improved dust removal efficiency Greatly improved dust removal efficiency and continued to meet the new emission standards.

The flue gas of the electrostatic precipitator with Coulomb lens anode of the present invention firstly performs preliminary dust removal through two conventional C480 plate electric fields 2, then performs secondary dust removal through the Coulomb lens electric field 3, and finally performs final dust removal through the horizontal rotating plate electric field 4 , can achieve ultra-low emissions, and can meet increasingly stringent environmental protection requirements.

Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Making various changes is within the protection scope of the present invention.

Claims (10)

1. An electrostatic precipitator with a Coulomb lens anode, characterized in that the electrostatic precipitator comprises a housing and at least one Coulomb lens electric field arranged in the housing, and the Coulomb lens electric field advances along the flue gas A plurality of columns of cathodes and Coulomb lens anodes are alternately arranged at intervals in the direction, and the channel between two adjacent Coulomb lens anodes is a flue gas flow channel, wherein the Coulomb lens anode has a relatively closed cavity around it, and the The lower end of the cavity is connected with a dust hopper, and the dust in the flue gas flow channel is charged by the ionization of the gas, and the charged dust is trapped in the cavity under the action of the Coulomb force of the electric field, and further condenses And settle or vibrate and fall into the described dust collecting ash hopper. 2. The electrostatic precipitator as claimed in claim 1, characterized in that, the Coulomb lens anodes on both sides are made of casing sidewalls, an anode plate row and blocking plates at both ends, and the Coulomb lens anodes in the middle are composed of two sides The anode plate row and the blocking plate at both ends are composed. 3. The electrostatic precipitator according to claim 1 or 2, characterized in that the width of the cavity is 100-300mm. 4. The electrostatic precipitator with a Coulomb lens anode as claimed in claim 1 or 2, wherein the channel width between two adjacent Coulomb lens anodes is 300-600mm. 5. The electrostatic precipitator according to claim 2, wherein the inclination directions of two adjacent anode plate rows are opposite, and each anode plate row includes 6-10 permeable louver coulomb anode plates. 6. The electrostatic precipitator according to claim 5, wherein each permeable louvered anode plate comprises 8-15 louvered plates arranged at equal intervals. 7. The electrostatic precipitator according to claim 6, characterized in that, the width of the louver plate is 50-80mm. 8. The electrostatic precipitator according to claim 6, characterized in that, the inclination angle of the louver plate is 30-60 degrees. 9. The electrostatic precipitator as claimed in claim 5, wherein the cathode is a BS prickly wire, adopts the double corona power supply mode of the front and rear small partitions, and each transparent louver coulomb anode plate in the first half area is correspondingly arranged with two One BS prickly wire, and one BS prickly wire for each transparent louvered coulomb anode plate in the second half area. 10. The electrostatic precipitator according to claim 1, wherein the cathode adopts a top electromagnetic rapping structure, and the Coulomb lens anode adopts a top electromagnetic rapping structure or a side arm-wrapping hammer rapping structure.