CN104492603A - Wire-plate matching model of metal ceramic electric dust remover and ash removal mode - Google Patents

Abstract

The invention provides a pole matching type of a cermet electric dust collector and a dust cleaning method thereof. Its characteristics are: the dust collection pole and corona pole are made of cermet materials with high temperature resistance, corrosion resistance, high strength and good conductivity. The micropores can be used for high temperature and normal temperature flue gas dust removal. The interior of the corona electrode is a hollow structure, and the air blowing device is used to spray and clean the corona electrode in reverse; the dust collection electrode can adopt two cleaning methods: dry air blowing and wet microporous water seepage; During wet cleaning, the microporous structure of the dust collecting pole produces capillary action on the cleaning water, which ensures the uniform distribution of the cleaning water film on the surface of the plate and avoids the corrosion of the plate.

Description

A metal-ceramic electrostatic precipitator pole matching type and cleaning method

Technical field

The invention belongs to environmental protection equipment, in particular to a pole matching type of a cermet electric dust collector and a dust cleaning method thereof.

Background technique

The wet electrostatic precipitator uses a layer of water film formed on the dust collecting plate to clean the dust collected on the plate. Compared with the dry electrostatic precipitator: the wet electrostatic precipitator does not require a rapping device, thereby eliminating the secondary dust caused by the rapping, and also preventing the secondary dust caused by the air flow and corona wind; because the electrode plate is always distributed With the water film flowing downward, the dust (smoke) captured on the plate is immediately washed away by the water film, so for high specific resistance dust (smoke), no back corona will occur, avoiding the resulting Secondary dust: For low specific resistance dust (smoke dust), the trapped particles will not escape from the plate and return to the airflow again. Due to the above advantages, the wet electrostatic precipitator has a very high dust removal efficiency, can adapt to dust with various specific resistances, and meets quite stringent particle emission standards.

Most of the existing wet electrostatic precipitators are plate type or cylinder type. Since the water film in the wet electrostatic precipitator flows downward on the pole plate by gravity, if it encounters obstacles or geometric changes on the surface of the pole plate, the flow direction will be changed, and phenomena such as "convergence" and "fork flow" will occur. A complete and uniform dust-removing water film cannot be formed under the plate. The dust in these places cannot be cleaned in time, and the accumulation will become thicker, which will cause the corona electrode to discharge the accumulated dust, and even affect the power supply of the electrostatic precipitator, causing the precipitator to fail to operate normally. The current coal-fired power generation units are often large, which also puts forward greater requirements on the amount of flue gas treated by the dust collector, which also leads to a relatively large design size of the corresponding wet electrostatic precipitator, with a plate length of more than ten meters or even more than twenty meters. The height will make it more difficult to evenly distribute the water film on the plates. Traditional wet electrostatic precipitators use steel dust collection plates, and steel dust collection plates themselves account for a large part of the cost input. In addition, the wet dust collection environment will cause severe corrosion to ordinary steel plates. In addition, wet electrostatic precipitators often need a large amount of ash cleaning water in order to collect the collected dust, which cannot meet the requirements for intensive utilization of water resources, and will produce a large amount of ash cleaning water, causing secondary pollution to the environment. Secondary pollution is also not conducive to the comprehensive utilization of fly ash.

Contents of the invention

The invention provides a metal-ceramic electrostatic precipitator pole matching type and its cleaning method to solve the problems that a complete and uniform water film cannot be formed on the dust collecting plate of the wet electrostatic precipitator and the body is corroded, so that the electric precipitator can be used On the basis of stable operation of coal-fired power plants, investment costs can be reduced, corrosion can be reduced, water consumption can be saved, and dust removal efficiency can be improved. Especially, the invention can be applied to high-temperature flue gas environments.

To achieve the above object, the present invention adopts the following technical solutions:

A metal-ceramic electrostatic precipitator pole matching type, the dust-collecting plate and the corona wire are made of metal-ceramic materials. It can withstand high temperature and corrosive flue gas environment. The surface of the plate is smooth and flat, and it has good rigidity and mechanical strength, which meets the performance requirements of hanging and running in the electrostatic precipitator. Material similar to the conductive idiosyncratic.

An electrode type of a cermet electrostatic precipitator, the cermet dust collecting electrode and the corona electrode are evenly distributed with air-permeable, water-permeable but dust-blocking micropores to meet the needs of electrode dust removal.

A metal-ceramic electrostatic precipitator pole matching type, the dust collecting pole and the corona pole are both hollow structures.

A cermet electrostatic precipitator dust removal method, the corona electrode is sprayed and cleaned from the hollow tube along the micropores through the air blowing device; Wet microporous water seepage two cleaning methods.

The dust collection pole and the corona pole are equipped with a pneumatic blowback device, which can perform reverse pneumatic blowing and dust removal on the electrode according to the operation requirements, and at the same time prevent the micropore structure of the electrode from being blocked by dust.

The dust collecting pole is equipped with a dust cleaning water uniform distribution device, which can evenly distribute water to the surface of the pole plate through the hollow part through the micropores.

The dust collector is provided with a cleaning water recycling device, which can recycle the cleaning water.

The beneficial effects of the present invention are:

(1) The dust-collecting pole plate of the present invention can effectively solve the problem of uniform distribution of dust-cleaning water film on the pole plate surface of the wet electrostatic precipitator by utilizing the microporous structure evenly distributed on the surface of the pole plate.

(2) Adopting the corona wire structure of the dust collector of the present invention can ensure that the dust adsorbed on the surface of the corona wire can be removed in time, and avoid the influence of the dust deposited on the surface of the corona wire on the dust collection electric field.

(3) High temperature resistance, the dust collection plate and corona wire of cermet material have the characteristics of high temperature resistance, and can be used for dust removal of high temperature flue gas.

(4) Corrosion resistance, the dust collector plates and corona wires of cermet materials have the characteristics of corrosion resistance, especially the acid corrosion produced by coal-fired flue gas.

(5) Save water. The dust collection plate of the dust collector can promote the uniform distribution of the ash cleaning water film. Compared with the traditional metal dust collection plate, it can significantly reduce the water film uniform distribution effect. Water Consumption.

Description of drawings

Figure 1 is a schematic diagram of the internal structure of a cermet electrostatic precipitator;

Fig. 2 is a schematic diagram of a cermet dust collection plate;

Fig. 3 is the schematic diagram of cermet corona pole;

Fig. 4 is a cross-sectional schematic diagram of a corona electrode of a cermet electrostatic precipitator.

Among them: 1 is the shell of metal ceramic electrostatic precipitator; 2 is metal ceramic dust collecting plate; 3 is flue gas inlet; 4 is flue gas outlet; 5 is ash hopper; Corona electrode; 8 is the dust cleaning water uniform distribution device; 9 is the air blowing device; 10 is the micro-hole of the cermet dust collecting plate; 11 is the discharge thorn of the cermet corona electrode; 12 is the cermet corona micro hole.

Detailed ways

Embodiment: As shown in Figure 1, it mainly includes: 1. Metal-ceramic electrostatic precipitator shell; 2. Metal-ceramic dust collecting plate; 3. Smoke inlet; 4. Smoke outlet; 7 Metal ceramic corona pole; 8 Cleaning water uniform distribution device; 9 Pneumatic injection device. The metal-ceramic dust-collecting pole plate 2 is connected with the shell 1 of the metal-ceramic electrostatic precipitator, and is well sealed. The cermet corona electrode 7 is placed in the center of the top of the cermet electrostatic precipitator shell 1 . The ash removal water uniform distribution device 8 is arranged on the top of the cermet dust collection plate 2, and supplies ash removal water thereto. The pneumatic blowing system 9 is connected with the inner hollow part of the cermet dust collecting plate 2 and the cermet corona electrode 9 . The ash removal water treatment device 6 is connected to the ash hopper 5 . As shown in FIG. 2 , micropores 10 of the metal-ceramic dust-collecting plate are opened on the surface of the cermet dust-collecting plate 2 . As shown in FIG. 3 , the surface of the cermet corona electrode 7 is provided with micropores 12 of the cermet corona electrode and discharge thorns 11 of the cermet corona electrode. As shown in FIG. 4 , the interior of the cermet corona electrode 7 is a hollow structure.

During operation, dusty gas enters the interior of the dust collector and is charged. Driven by the electric field force, the charged dust particles move to the metal-ceramic dust collecting plate 2, are captured by the ash-cleaning water film on its surface, and are collected by the ash hopper 5 to the ash-cleaning water recovery treatment device 6 . The ash removal water treatment device 6 treats the collected ash removal water for reuse or discharge. The ash removal water used by the dust collector is supplied to the cermet dust collection pole plate 2 by the ash removal water uniform distribution device 8 . The dust-cleaning water passes through the micropores 10 of the metal-ceramic dust-collecting pole plate 2 to form a uniform dust-cleaning water film. The dust on the surface of the metal-ceramic dust-collecting plate 2 can also be cleaned by dry pneumatic blowing through the hollow part through the micro-holes 10 of the metal-ceramic dust-collecting plate. The cermet corona electrode 7 is sprayed in reverse direction along the micropores 12 of the cermet corona electrode through the air blowing system 9 to remove dust from the hollow tube.

Claims (4)

1. cermet electric cleaner pole distribution type formula and a purge mode, is characterized in that, comprising:

The dust collector pole be made up of cermet material and corona discharge electrode;

For the strength blowing device of dust collector pole and corona discharge electrode deashing;

For the water-distributing device of dust collector pole deashing.

2. cermet electric cleaner pole according to claim 1 distribution type formula, is characterized in that dust collector pole and corona discharge electrode are evenly distributed with micropore that is ventilative, permeable but resistance dirt.

3. cermet electric cleaner pole according to claim 1 distribution type formula, is characterized in that dust collector pole and corona discharge electrode are hollow structure.

4. cermet electric cleaner purge mode according to claim 1, is characterized in that, corona discharge electrode passes through strength blowing device by hollow tube along the reverse jetting deashing of micropore; Dust collector pole adopts the winding-up of dry type strength and wet type micropore to seep water two kinds of purge modes by hollow part through micropore.