Wet-type electrostatic dust collector cathode and anode configuration structure

A technology of wet electrostatic and configuration structure, applied in the direction of electrode structure, external electrostatic separator, electrostatic separation, etc., can solve the problems of corrosion, burning through the plate, and many discharge cusps, and achieve good corrosion resistance and corona inception voltage Low, long service life effect

Inactive Publication Date: 2015-10-07
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of the existing technology are: (1) The horizontal plate anode uses expensive stainless steel alloy materials due to structural strength limitations, and is severely corroded in strong acidic wet flue gas; the vertical quadrilateral mostly uses corrosion-resistant flexible cloth as the anode , under the condition of high wind speed above 3m / s, the shaking is obvious, the electric field parameters fluctuate greatly, and the life of the flexible cloth is only one overhaul cycle
These two anode arrangements have a large proportion of dust collection "blind areas", which cannot evenly capture the electrons emitted by the cathode and the defects of charged pollutants
(2) The sharpness (that is, curvature) of the long-line pointed shape and the saw-tooth pointed shape is small, and the discharge intensity is difficult to meet the saturated charging requirements of wet flue gas dust in the thermal power industry, while the pointed shape of the thorn is large and has many discharge points. The phenomenon of excessive corona burning through the plates is easy to occur locally, and the discharge tips of these three cathodes all adhere to the fine dust and gypsum in the flue gas to inhibit the discharge
(3) The cathode discharge intensity and divergence of the existing anode-cathode configuration structure do not match the wet flue gas conditions, and the spatially uneven electric field strength of the anode and cathode is low
The above deficiencies seriously reduce the efficiency of wet electrostatic precipitator to remove pollutants

Method used

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  • Wet-type electrostatic dust collector cathode and anode configuration structure

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Embodiment 1

[0025] Such as Figure 1-Figure 6 As shown, the cathode and anode configuration structure of the wet electrostatic precipitator of the present invention includes a cathode 2 and an anode 1. The cathode is installed on the cathode frame, the anode 1 is installed on the anode frame, and the anode 1 is a regular hexagonal cylinder; The cathode is a cathode 2 with a discharge needle 3. The discharge needles 3 are arranged in layers on the cathode 2, with three evenly distributed in each layer, the dislocation angle between adjacent layers is 60°, and the layer spacing is 50mm (25-100mm is acceptable) The discharge needle 3 is vertically connected to the cathode 2, and each discharge needle 3 points to the cylindrical corner of the positive six sides of the anode 1, which is similar to the pole matching structure of the fishbone-shaped six-needle cathode 2 and the hexagonal cylindrical anode 1, The electric field intensity in the space between the two is improved and the anode surfac...

Embodiment 2

[0033] A 2*1000MW coal-fired thermal power unit in an eastern coastal area added a wet electrostatic precipitator after the wet FGD system to remove the fine dust, gypsum and acid mist entrained in the flue gas. The coal-burning condition of this unit is good, and the dust content at the inlet of wet removal is ≤20mg / Nm 3 , The droplet concentration is less than ≤40mg / Nm 3 ,Required that the dust content of the wet removal outlet ≤ 5mg / Nm 3 , The droplet concentration is less than ≤20mg / Nm 3 . In this project, the anode 1 adopts the anode 1 tube bundle assembly with an inscribed circle of φ300mm, the tube length is 5m, the cathode adopts φ15mm TA2 material wire, the cathode 2 is 6.1m long; the length of the discharge needle 3 is 10mm, the diameter is 3 mm, and the needle tip 4 The angle is 90°, and the interlayer spacing of the discharge needle 3 is 60mm. The measured dust content of the wet removal outlet is 3-4mg / Nm 3 , The droplet concentration is 16-18mg / Nm 3 .

Embodiment 3

[0035] A certain northern 2*300MW unit added a wet electrostatic precipitator after the wet FGD system. The environmental protection facilities behind the boiler are in general operation, the coal quality conditions are not good, and the dust content at the inlet of wet removal is ≤100mg / Nm 3 , The droplet concentration is less than ≤75mg / Nm 3 ,Required that the dust content of the wet removal outlet ≤25mg / Nm 3 , The droplet concentration is less than ≤20mg / Nm 3 . In this project, the anode 1 also uses the anode 1 tube bundle assembly with an inscribed circle of φ300mm, the tube length is 4.5m, the cathode is made of TA2 material with φ15mm, the cathode 2 is 5.5m long; the length of the discharge needle 3 is 12mm, The diameter is 3 mm, the angle of the needle tip 4 is 80°, and the layer spacing of the discharge needle 3 is 60 mm. . The measured dust content of the wet removal outlet is 18-22mg / Nm 3 , The droplet concentration is 16-18mg / Nm 3 .

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Abstract

The invention discloses a wet-type electrostatic dust collector cathode and anode configuration structure. The wet-type electrostatic dust collector cathode and anode configuration structure comprises a cathode and an anode, wherein the cathode is installed on a cathode framework, the anode is installed on an anode framework, and the anode is in a regular-hexagonal tubular shape; the cathode is a cathode with discharging pins, the discharging pins are distributed on the cathode in a layering manner, each layer is provided with three discharging pins, adjacent layers are staggered to form an angle of 60 degrees, and the inter-layer distance is 25mm to 100mm; the discharging pins are vertically connected to the cathode, and each discharging pin points to the regular-hexagonal tubular corner of the anode. By adopting the wet-type electrostatic dust collector cathode and anode configuration structure, the anode can uniformly and effectively trap electrons and charged pollutants; voltage corona inception and corona stability of the cathode can be reduced, the discharging position of the cathode can be set according to the anode form, the length of each cathode discharging pin can be set according to the medium condition, the discharge intensity can be adjusted according to the angle, and simplicity and easiness can be realized; moreover, a needlepoint-shaped discharge point does not have the problem that the discharging is suppressed by the coating of dust and gypsum in the wet smoke; the cathode-anode configuration structure can be adaptive to a wet-type dust collector, and the application is wide.

Description

technical field [0001] The invention relates to a cathode-anode arrangement structure of a wet dust collector of a coal-fired thermal power unit, in particular to an arrangement structure of a hexagonal cylindrical anode and a six-pin herringbone cathode. Background technique [0002] In September 2014, the National Development and Reform Commission, the Ministry of Environmental Protection and the Energy Bureau issued the "Coal Power Energy Conservation and Emission Reduction Upgrade and Transformation Action Plan (2014-2020)", which proposed that the dust emission of new coal-fired units in the east, central and west up to 5mg / Nm 3 The emission limit requirements of gas turbine units, the coal-fired thermal power units in the eastern region have already implemented this ultra-low emission standard. The wet electrostatic precipitator is installed after the WFGD system of the thermal power unit to coordinate and efficiently remove a small amount of fine dust, gypsum, acid m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C3/16B03C3/40
Inventor 陆小成许芸李志强叶毅科
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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