Anode plate with dust collecting hood

Abstract

The present invention proposes an anode plate with a dust collection hood, comprising an anode plate, wherein the anode plate is composed of a 480C plate and a metal filter plate welded on one side thereof, wherein the metal filter plate comprises a steel plate arranged in the middle position along its length direction and a first half metal mesh and a second half metal mesh welded on both sides of the steel plate, wherein the 480C plate and the steel plate are welded and fixed by a plurality of steel pipes arranged at intervals along the length direction of the steel plate. Compared with conventional anode plates, it is more efficient in capturing fine particles escaping along the side of the anode plate, and solves the problem of dust concentration limiting the outlet of the electrostatic precipitator and the problem of low collection efficiency of ultrafine particles and particles that are difficult to charge, so the dust removal efficiency is increased, and the minimum outlet dust concentration breaks through the existing bottleneck, and can stably achieve 10mg / m 3 Even 5 mg / m 3 The dust concentration at the outlet of the electrostatic precipitator is as follows.

Description

[Technical field]

[0001] The invention relates to the technical field of dust removal equipment, in particular to an anode plate with a dust collecting cover. [Background technology]

[0002] The anode plate is a key component of the electrostatic precipitator. It collects charged dust in the electric field of the electrostatic precipitator. Under the influence of the flue gas flow in the electrostatic precipitator, the re-collection effect of secondary dust is decisive to ensure the dust removal efficiency and reduce the dust concentration at the outlet of the electrostatic precipitator. Since the anode plate under the existing conventional pole matching type has almost no collection effect on secondary dust, the electrostatic precipitator has the problem of secondary dust limiting the dust concentration at the outlet, and the capture efficiency of ultrafine particles and low-charged particles is low, and there is a problem of low collection efficiency of ultrafine particles and difficult-to-charge particles.

[0003] The anode plates of existing conventional electrostatic precipitators generally use 480C anode plates or corrugated plates, which have almost no effect on the collection of vibration-prone dust, and cannot capture ultrafine particles and low-charged particles that are close to but not adsorbed on the anode plates. [Summary of the invention]

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose an anode plate with a dust collection hood, which can solve the problem of dust concentration limiting the outlet of the electrostatic precipitator and the problem of low collection efficiency of ultrafine particles and difficult-to-charge particles.

[0005] To achieve the above-mentioned purpose, the present invention proposes an anode plate with a dust collection hood, comprising an anode plate, wherein the anode plate is composed of a 480C plate and a metal filter disc welded on one side thereof, wherein the metal filter disc comprises a steel plate arranged in the middle position along its length direction and a first half metal mesh and a second half metal mesh welded on both sides of the steel plate, and the 480C plate and the steel plate are welded and fixed by a plurality of steel pipes arranged at intervals along the length direction of the steel plate.

[0006] Preferably, the pore diameters of the first half metal mesh and the second half metal mesh are larger on the side away from the steel plate and smaller on the side close to the steel plate, and there are no pores on the steel plate.

[0007] Preferably, the metal filter disc is parabolic in shape as a whole, and the first half metal mesh and the second half metal mesh are symmetrically arranged on both sides of the steel plate.

[0008] Preferably, the 480C plate is welded and fixed to both sides of the metal filter disc by a plurality of tie rods, and the tie rods are arranged at intervals along the length direction of the metal filter disc.

[0009] Preferably, side connecting plates are symmetrically provided on both sides of the metal filter plate, and the side connecting plates are welded and fixed to the 480C plate through a plurality of tie rods, one end of the tie rod is welded to the side connecting plate, and the other end of the tie rod is welded to one side of the 480C plate welded to the metal filter plate.

[0010] Preferably, the anode plates are arranged in the last row in the flue gas flow direction of each electric field of the electrostatic precipitator.

[0011] Preferably, the metal filter disc is welded to the side of the 480C plate close to the gas outlet end in the direction of smoke flow.

[0012] Preferably, the 480C plate is made of SPCC, and the metal filter disc is made of stainless steel.

[0013] Beneficial effects of the present invention: The anode plate of the present invention is arranged at the end of each dust collecting partition to collect vibration dust, non-vibration dust and particulate matter not captured on the anode plate. Compared with conventional anode plates, the anode plate can more efficiently capture fine particulate matter escaping along the side of the anode plate, solve the problem of dust concentration limiting the outlet of the electrostatic precipitator and the problem of low collection efficiency of ultrafine particles and difficult-to-charge particles, so the dust removal efficiency is increased, and the minimum outlet dust concentration breaks through the existing bottleneck, which can stably achieve 10mg / m 3 Even 5 mg / m 3 The dust concentration at the outlet of the electrostatic precipitator is as follows.

[0014] Compared with the existing device, the present invention has the following advantages:

[0015] 1. The structural type greatly improves the efficiency of dust removal and the collection efficiency of ultrafine particles and difficult-to-charge particles, solves the problem of anode plate dust limiting the outlet dust concentration and the problem of low collection efficiency of ultrafine particles and difficult-to-charge particles, so the dust removal efficiency is increased and the minimum outlet dust concentration breaks through the existing bottleneck.

[0016] 2. Good adaptability to transformation. Most of the cathode lines of existing electrostatic precipitators use 480C anode plates or corrugated anode plates. The transformation of this part of the power plant is simple. Only the last row needs to be replaced. There is no need to change the cathode system and other anode plates, and the transformation cost is low.

[0017] 3. It has good adaptability to industries such as metallurgy and cement, especially in flue gas conditions where flue gas particles are difficult to charge and are not suitable for bag-type dust collectors. This invention can fill the gap in these fields where ultra-low dust emissions cannot be achieved.

[0018] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0019] Figure 1The figure shows the dust collection principle diagram of the anode plate for efficient capture of low dust and hard-to-charge particles;

[0020] Figure 2 The figure shows the schematic diagram of the force on the particles;

[0021] Figure 3 Shown is a schematic diagram of the concentration distribution of "dust" and "fine particles and difficult-to-charge particles";

[0022] Figure 4 Shown is a schematic diagram of an electrostatic precipitator equipped with anode plates for low dust emission and high efficiency capture of hard-to-charge particles;

[0023] Illustration Description:

[0024] The figures with arrows are electric lines, indicating the direction of the electric force E;

[0025] Black dots represent particulate matter (dust);

[0026] The curve connecting the black dots represents the movement trajectory of the particles. [Specific implementation method]

[0027] See also Figure 1 The present invention discloses an anode plate with a dust collecting hood, comprising an anode plate, wherein the anode plate is composed of a 480C plate 1 and a metal filter disc 2 welded on one side thereof. The conventional anode plate and the metal filter disc are an integrated structure, and the dust cleaning vibration force of the metal filter disc is transmitted through the anode plate, so that there is no need to specially set up a vibration system. In addition, the strength of the metal filter disc in the length direction is guaranteed by the anode plate, and the strength and rigidity in the length direction can be guaranteed. The metal filter disc 2 comprises a steel plate arranged in the middle position along the length direction thereof and a first half metal mesh 21 and a second half metal mesh 22 welded on both sides of the steel plate. By dividing the metal mesh into two pieces, the processing difficulty is reduced, and the fixing strength and stability of the metal mesh and the bracket can be improved. A steel plate is arranged in the middle of the metal mesh, and the half metal mesh is welded to the steel plate, thereby improving the fixing strength of the metal mesh, reducing the fixing difficulty, and ensuring the overall rigidity. The 480C plate 1 and the steel plate are welded and fixed by a plurality of steel pipes arranged at intervals along the length direction of the steel plate, thereby improving the fixing strength of the metal mesh, reducing the fixing difficulty, and ensuring the overall rigidity.

[0028] The pore diameters of the first half metal mesh 21 and the second half metal mesh 22 are larger on the side away from the steel plate and smaller on the side close to the steel plate, and there are no pores on the steel plate. The pore setting of the metal filter disc is related to collecting escaping particulate matter. The metal mesh is set to have larger pores on the outside, so that the airflow is more reasonable, particulate matter is easier to enter the metal filter disc, and the smoke resistance is lower, thereby reducing energy consumption.

[0029] The metal filter disc 2 is parabolic in shape as a whole, and the first half metal mesh 21 and the second half metal mesh 22 are symmetrically arranged on both sides of the steel plate. The parabolic shape of the metal filter disc is related to the collection of escaped particles. This structural shape has better adsorption of escaped particles, and particles are more easily adsorbed onto the metal mesh, and the adsorption force is better.

[0030] The 480C plate 1 and the two sides of the metal filter disc 2 are welded and fixed by a plurality of tie rods 23, and the tie rods 23 are arranged at intervals along the length direction of the metal filter disc 2. The two sides of the metal filter disc 2 are symmetrically provided with side connection plates 24, and the side connection plates 24 and the 480C plate 1 are welded and fixed by a plurality of tie rods 23, one end of the tie rod 23 is welded to the side connection plate 24, and the other end of the tie rod 23 is welded to the side of the 480C plate 1 welded to the metal filter disc 2. The tie rod has a low obstruction effect on the smoke and good strength. The tie rod is welded and fixed to the steel plates on both sides, which can ensure the overall strength of the metal filter disc.

[0031] Furthermore, the anode plates are arranged in the last row in the flue gas flow direction of each electric field of the electrostatic precipitator. The metal filter disc 2 is welded to one side of the 480C plate 1 close to the gas outlet end in the flue gas flow direction.

[0032] Furthermore, the 480C plate 1 is made of SPCC, and the metal filter plate 2 is made of stainless steel.

[0033] Working principle of the present invention:

[0034] The working process of conventional dust removal:

[0035] (1) Electric field force in the electrostatic precipitator: The cathode wire is connected to a high-voltage power supply to form a negative potential (about -30kV to -70kV), and the anode plate is grounded (about 0kV). An electric field is formed between the cathode wire and the anode plate. The direction of the electric field force is as follows: Figure 1 The curve shown.

[0036] (2) The process of capturing conventional particulate matter by an electrostatic precipitator: Flue gas carrying particulate matter (dust) flows into the electric field of the electrostatic precipitator. The particles are adsorbed to their surface by the charge of the cathode corona discharge in the electric field space, so that the particles are negatively charged.

[0037] (3) Conventional particle capture process: After most particles are charged, the negatively charged particles are subjected to force in the electric field. Figure 2 As shown, F 电场力 Towards the anode plate, it is the main effective force for particle capture. 惯性力 、F 重力 The combined effect of equal forces and the Brownian motion of particles exist. The direction of the combined force on the particles changes with time. 电场力When it reaches the anode plate from the f state (particulate matter in the flue gas), the particulate matter is adsorbed on the anode plate to form a powder cake layer, and becomes the g state (particulate matter adsorbed on the anode plate). When the anode plate is vibrated, the powder cake layer falls into the ash hopper, and the particulate matter is removed.

[0038] The problems with conventional dust removal are as follows:

[0039] (4) The process of "dust limiting the dust concentration at the outlet" in conventional dust removal: Figure 1 The a→b→c process, where a→b is the same as the f→g process above, the particles are adsorbed onto the anode plate, but under the action of airflow scraping, ion wind and other forces, the particles are blown back into the flue gas on the anode plate, from state b (the particles are adsorbed on the anode plate) to state c (the particles are in the flue gas again, raising dust). After the particles reach the flue gas, they move toward the rear end of the electric field of the electrostatic precipitator under the action of the airflow, and make a nearly parabolic motion under the action of the electric field force (c→d process), among which some ultrafine particles do not reach the anode plate due to the action of Brownian motion and other factors, and fly out of the electric field.

[0040] (5) The process of "low collection efficiency of fine particles and hard-to-charge particles" in conventional dust removal: Figure 1 h→i→j→k process, the particles are Figure 2 Under the effect of:

[0041] Due to the large Brownian motion effect of ultrafine particles, ultrafine particles cannot be captured on the anode plate by the electric field force.

[0042] Since the charge of hard-to-charge particles is low (Q 荷电量 Small), F 电场力 =Q 荷电量 ×E 电场强度 , so the electric field force is very small and the particles cannot be captured by the electric field force to the anode plate.

[0043] Therefore, the particles with “low collection efficiency of fine particles and hard-to-charge particles” do not reach the anode plate and fly out of the electric field.

[0044] The principle of the anode plate of the present invention to solve the above problems of "dust raising" and "low collection efficiency of fine particles and hard-to-charge particles" is as follows:

[0045] The common characteristics of the two difficult-to-capture c→d process and j→k process mentioned above (4) and (5) are that the particles approach the anode plate, and most of the particles move along the position close to the anode plate, such as Figure 3 .

[0046] The principle of the present invention is: by setting an anode plate with a dust collection cover at the end of the electric field, the particles close to the anode plate (particles that are difficult to capture by conventional electrostatic precipitators) are intercepted by a metal mesh, thereby capturing "dust" and "fine particles and particles that are difficult to charge", such as the d→e process and the k→l process.

[0047] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. An anode plate with a dust collection hood, characterized in that: The invention comprises an anode plate, wherein the anode plate is composed of a 480C plate (1) and a metal filter disc (2) welded to one side thereof, wherein the metal filter disc (2) comprises a steel plate arranged in the middle along the length direction thereof and a first half metal mesh (21) and a second half metal mesh (22) welded to both sides of the steel plate, wherein the 480C plate (1) and the steel plate are welded and fixed via a plurality of steel pipes arranged at intervals along the length direction of the steel plate, wherein the pore diameters of the first half metal mesh (21) and the second half metal mesh (22) are larger on the side away from the steel plate and smaller on the side close to the steel plate, wherein the steel plate has no pores, and the metal filter disc (2) is in a parabolic shape as a whole, and the first half metal mesh ( 21), the second half metal mesh (22) is symmetrically arranged on both sides of the steel plate, the 480C plate (1) and the two sides of the metal filter plate (2) are welded and fixed by a plurality of tie rods (23), the tie rods (23) are arranged at intervals along the length direction of the metal filter plate (2), and the two sides of the metal filter plate (2) are symmetrically provided with side connecting plates (24), the side connecting plates (24) and the 480C plate (1) are welded and fixed by a plurality of tie rods (23), one end of the tie rod (23) is welded to the side connecting plate (24), and the other end of the tie rod (23) is welded to one side of the 480C plate (1) welded to the metal filter plate (2).

2. An anode plate with a dust collection cover as claimed in claim 1, characterized in that: The anode plates are arranged in the last row in the flue gas flow direction of each electric field of the electrostatic precipitator.

3. An anode plate with a dust collection cover according to any one of claims 1 to 2, characterized in that: The metal filter disc (2) is welded to a side of the 480C plate (1) close to the gas outlet end in the direction of smoke flow.

4. The anode plate with a dust collecting cover according to claim 1, characterized in that: The material of the 480C plate (1) is SPCC, and the material of the metal filter plate (2) is stainless steel.

Images