CN106139869A - Integrated wet electrostatic precipitator desulfurization and denitrification system - Google Patents

Abstract

The invention discloses an integrated wet electrostatic dust removal desulfurization and denitrification system, which comprises a treatment tower, wherein at least one humidifying treatment cavity and an electrostatic dust removal cavity are sequentially arranged in the treatment tower from bottom to top, and a filter packing layer is arranged between the humidifying treatment cavity and the electrostatic dust removal cavity for separation; a first electrostatic dust removal device and a first spraying device are arranged in the electrostatic dust removal cavity, and the first spraying device is arranged above the first electrostatic dust removal device; the treating tower is provided with a flue gas inlet and a gas outlet, the flue gas inlet is communicated with the humidification treating cavity, and the gas outlet is communicated with the electrostatic dust removal cavity. The desulfurization and denitrification and the electrostatic dust collection are integrated in the treatment tower, the mechanism is ingenious, and the occupied volume is small; the electrostatic precipitator sets up in the top of carrying out desulfurization denitrogenation module, can carry out the humidification to the air when removing nitrogen to flue gas desulfurization, improves electrostatic precipitator efficiency, can effectually get rid of the fine dust below 0.01 um.

Description

Integrated wet electrostatic precipitator desulfurization and denitrification system

technical field

The invention relates to a waste gas treatment device, in particular to an integrated wet electrostatic dedusting desulfurization and denitrification system.

Background technique

In the industrial manufacturing industry, large-scale boilers are required to generate power. Existing boilers burn fuel during the production process to produce flue gas containing soot, sulfur dioxide and carbon dioxide. Many of these flue gases are directly discharged into the air through chimneys. This will directly affect the air quality around the factory. Some factories will purify their flue gas, but many of them have not really converted harmful gases, and their exhaust gas temperature is generally not lower than 180°C, and the highest can reach 250°C. This high-temperature flue gas emission not only causes a large amount of waste of heat energy, but also causes air pollution represented by smoke and sulfur dioxide.

Contents of the invention

In order to overcome the shortcomings mentioned in the prior art, the present invention provides an integrated wet electrostatic dedusting desulfurization and denitrification system.

The technical solution adopted by the present invention to solve the technical problem is: an integrated wet electrostatic dedusting desulfurization and denitrification system, including a treatment tower, in which at least one humidification treatment chamber and electrostatic dust removal chamber are arranged sequentially from bottom to top , the humidification treatment chamber and the electrostatic precipitator chamber are separated by a layer of filter packing; a first electrostatic precipitator and a first spray device are arranged in the electrostatic precipitator chamber, and the first spray device is installed on the Above the first electrostatic precipitator; the processing tower is provided with a flue gas inlet and a gas outlet, the flue gas inlet is connected to the humidification treatment chamber, and the gas outlet is connected to the electrostatic dust removal chamber.

A second spraying device is provided on the humidification treatment chamber, and a treatment liquid pool is provided at the bottom of the treatment tower, and the second spraying device is connected to the treatment liquid pool through a delivery pipe and a water pump.

The first spraying device or the second spraying device includes a spiral coil installed in the electrostatic dust removal chamber or humidification treatment chamber, and several spray heads are arranged on the spiral coil to make the flue gas and the treatment Effective contact with liquid spray to maximize the removal of sulfide and nitrogen oxides in the flue gas.

The humidification treatment chamber is arranged in stages, and the humidification treatment chamber is divided into at least two sub-humidification treatment chambers through the auxiliary filter packing layer; .

The thickness of the filter packing layer is 20-50 cm, which is fixed on the side wall of the treatment tower. Raschig rings are filled in the filter packing layer. The size of the Raschig ring is 35mm-55mm. The ceramic Raschig ring is preferred, the ceramic wall thickness is 2.5mm-9.5mm, the price is low, and the filtering effect is obvious. Most preferably, the thickness of the filter packing layer is 30-40cm.

The thickness of the auxiliary filter packing layer is 12-30 cm, which is fixed on the side wall of the treatment tower. Pall rings are filled in the auxiliary filter packing layer. Using the Pall ring can effectively save 20%-40% of packing volume.

A first electrostatic precipitator is arranged in the electrostatic precipitator chamber. The first electrostatic precipitator includes a dust collecting electrode plate connected to the positive pole of the power supply and a discharge electrode connected to the negative pole of the power supply. A number of irregular burrs with a height of 5-10mm are arranged on the discharge electrode to increase the contact area between the discharge electrode and the air. Wherein the distance between the discharge electrode and the dust collecting electrode plate is 250-600cm. The dust-collecting electrode plate may be cylindrical, and the discharge electrode is placed at the center of the cylindrical dust-collecting electrode plate. In addition, the distance between adjacent dust-collecting electrode plates is 400-700 mm. Wherein, the voltage between the dust-collecting electrode plate and the discharge electrode is 40,000-60,000 volts. The high-voltage electric field is used to ionize the flue gas, and the charged dust in the airflow is separated from the airflow under the action of the electric field; it can capture fine dust below 1um. In the upper part of the electrostatic dust removal chamber, a humidifying and spraying device is arranged above the electrostatic dust removal device. The humidifying and spraying device is connected with the water storage tank through a delivery pipe and a humidifying water pump. The wet spraying device atomizes the clear water in the water storage tank to improve the conductivity of the flue gas in the high-voltage electric field, which is more conducive to the separation of dust and airflow, and can effectively remove fine dust below 0.01um.

A flow equalizer is installed in the gas outlet of the treatment tower. The flow equalizing device includes a number of corrugated curved plates, and a tortuous flow equalizing air channel is formed between adjacent corrugated curved plates. The air flow of the electrostatic dust removal passes through the equalizing air channel, and after contacting the plate wall in the air equalizing air channel, The water vapor in the air flow is removed, and dust can be further removed.

It also includes a secondary electrostatic dust removal tower, and the gas outlet of the treatment tower is connected with the secondary electrostatic dust removal tower through a pipeline. The secondary electrostatic precipitator is provided with a secondary electrostatic precipitator, and the secondary electrostatic precipitator includes a dust collection electrode plate connected to the positive pole of the power supply and a discharge electrode connected to the negative pole of the power supply; the discharge electrode is provided with several Irregular burrs with a height of 5-10mm are used to increase the contact area between the discharge electrode and the air. Wherein the direct distance between the discharge electrode and the dust collecting electrode plate is 250-600cm. The dust-collecting electrode plate may be cylindrical, and the discharge electrode is placed at the center of the cylindrical dust-collecting electrode plate. In addition, the distance between adjacent dust-collecting electrode plates is 400-700 mm. Wherein, the voltage between the dust-collecting electrode plate and the discharge electrode is 40,000-60,000 volts. A heat exchanger is arranged at the air outlet end of the secondary electrostatic precipitator. The high-temperature exhaust flue gas passes through the heat exchanger and then enters the treatment tower through the flue gas inlet for treatment. The residual heat of the exhaust flue gas heats the purified airflow to separate the water and gas.

The flue gas inlet of the treatment tower and the humidification treatment chamber are directly provided with a uniform air divider, which is used to disperse the flue gas flow so that it is evenly distributed in the chamber of the humidification treatment chamber to receive the treatment liquid. Spraying, the effect of desulfurization and denitrification is more obvious. The air equalizing partition includes a base plate, on which several air equalizing holes are arranged. The air equalizing hole includes a main air outlet and auxiliary pores evenly arranged in four directions of the main main air outlet, so that the smoke can pass through easily, and the downstream processing liquid will not block the air equalizing hole.

The humidification treatment chamber is filled with a desulfurization treatment liquid, and the treatment tower is provided with a desulfurization treatment liquid inlet and a desulfurization treatment liquid discharge port, and the desulfurization treatment liquid inlet and the desulfurization treatment liquid discharge port are connected to the humidification treatment chamber , an air duct is installed in the humidification treatment chamber, and several air caps are installed on the air duct, the air outlet of the air cap is arranged on the side wall of the air cap, and the air duct and the air cap are soaked in the desulfurization treatment liquid, The air duct communicates with the flue gas inlet, and a one-way valve is installed on the air duct to prevent the desulfurization treatment liquid from flowing out of the flue gas inlet. The flue gas enters the air duct from the flue gas inlet, and then emerges evenly from the hood, and is bathed by the treatment liquid, which can greatly remove sulfides and nitrogen oxides.

The beneficial effects of the present invention are: the desulfurization and nitrogen removal and electrostatic dust removal are concentrated in the processing tower for integrated treatment, the mechanism is ingenious, and the occupied volume is small; At the same time, it can humidify the air, improve the efficiency of electrostatic dust removal, and effectively remove fine dust below 0.01um; recycle the waste heat of the flue gas to dry the exhaust air, making the exhaust air cleaner.

Description of drawings

Fig. 1 is the structural schematic diagram of Embodiment 1 of the integrated wet electrostatic dedusting desulfurization and denitrification system of the present invention;

Fig. 2 is the structural schematic diagram of Embodiment 2 of the integrated wet electrostatic dedusting desulfurization and denitrification system of the present invention;

Fig. 3 is a structural schematic diagram of Embodiment 3 of the integrated wet electrostatic dedusting desulfurization and denitrification system of the present invention;

Fig. 4 is a schematic plan view of the structure of the air-uniform partition in Embodiment 3 of the integrated wet electrostatic precipitator desulfurization and denitrification system of the present invention;

Fig. 5 is a schematic structural view of Embodiment 4 of the integrated wet electrostatic dedusting desulfurization and denitrification system of the present invention.

detailed description

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

Example 1

The integrated wet electrostatic dedusting desulfurization and denitrification system, as shown in Figure 1, includes a treatment tower 1, and at least one humidification treatment chamber 11 and electrostatic dust removal chamber 12 are arranged sequentially in the treatment tower 1. A filter packing layer 13 is arranged between the humidification treatment chamber 11 and the electrostatic precipitator chamber 12; a first electrostatic precipitator 21 and a first spray device 53 are arranged in the electrostatic precipitator chamber, and the first spray device 53 Installed above the first electrostatic precipitator 21; the first spray device 53 includes a spiral coil pipe provided with the electrostatic precipitator chamber, and several shower heads are arranged on the spiral coil pipe. The showering device 53 is connected to the water storage tank 51 through a delivery pipe and the first water pump 52; the treatment tower 1 is provided with a flue gas inlet near the bottom side wall, with a drain outlet 15 at the bottom, and an air outlet at the top of the upper part, and the flue gas inlet is connected to the The humidification treatment chamber, the air outlet communicates with the electrostatic precipitator chamber.

A treatment liquid pool 41 is provided at the bottom of the treatment tower 1 for collecting the treatment liquid flowing down from the water outlet 15 . The drain port 15 can be placed below the liquid level in the treatment liquid pool 41, so as to avoid the overflow of flue gas. The upper part of the humidification treatment chamber 11 is provided with a second spray device 43, and the second spray device 43 is connected to the treatment liquid pool 41 through a delivery pipe through a second water pump 42 to recycle the treatment in the treatment liquid pool 41. The liquid sprays the flue gas entering from the flue gas inlet with a water bath to effectively remove sulfide and active nitrogen oxides in the flue gas. The spraying device 43 includes a spiral coil in the humidification treatment chamber 11, and a number of spray heads are arranged on the spiral coil, so that the smoke can be effectively contacted with the spray of the treatment liquid, and the dust in the smoke can be removed to the greatest extent. Sulfides and nitrogen oxides.

Wherein, the treatment liquid pool 41 is filled with a recyclable treatment liquid, and the treatment liquid may be an alkali solution, preferably lime water. A water level monitoring sensor is provided in the treatment liquid pool 41, and when the water level of the treatment liquid in the treatment liquid pool 41 drops to a certain level, an alarm is issued or a treatment liquid is added.

The thickness of the filter packing layer 13 is 20-50 cm, which is fixed on the side wall of the treatment tower 1 . The filter packing layer 13 is filled with Raschig rings. The size of the Raschig ring is 35mm-55mm. The ceramic Raschig ring is preferred, the ceramic wall thickness is 2.5mm-9.5mm, the price is low, and the filtering effect is obvious. Most preferably, the thickness of the filter packing layer 13 is 30-40 cm.

A first electrostatic precipitator 21 is arranged in the electrostatic precipitator chamber 12 . The first electrostatic precipitator includes a dust-collecting electrode plate connected to the positive pole of the power supply and a discharge electrode connected to the negative pole of the film. A number of irregular burrs with a height of 5-10mm are arranged on the discharge electrode to increase the contact area between the discharge electrode and the air. Wherein the direct distance between the discharge electrode and the dust collecting electrode plate is 250-600cm. The dust-collecting electrode plate may be cylindrical, and the discharge electrode is placed at the center of the cylindrical dust-collecting electrode plate. In addition, the distance between adjacent dust-collecting electrode plates is 400-700 mm. Wherein, the voltage between the dust-collecting electrode plate and the discharge electrode is 40,000-60,000 volts. The high-voltage electric field is used to ionize the flue gas, and the charged dust in the airflow is separated from the airflow under the action of the electric field; it can capture fine dust below 1um. The first spraying device 53 atomizes the clear water in the water storage tank to improve the conductivity of the flue gas in the high-voltage electric field, which is more conducive to the separation of dust and airflow, and can effectively remove fine dust below 0.01um.

A flow equalizer 4 is installed in the gas outlet of the treatment tower 1 . The flow equalizing device 4 includes a number of corrugated curved plates arranged therein, and tortuous flow equalizing air passages are formed between adjacent corrugated curved plates. , remove the water vapor in the airflow, and can further remove dust.

It also includes a secondary electrostatic precipitator 3, the gas outlet of the treatment tower 1 is connected to the secondary electrostatic precipitator 3 through a pipeline. The secondary electrostatic precipitator 31 is provided with a secondary electrostatic precipitator 31 in the secondary electrostatic precipitator 3, and the secondary electrostatic precipitator 31 includes a dust collection electrode plate connected to the positive pole of the power supply and a discharge electrode connected to the negative pole of the power supply; A number of irregular burrs with a height of 5-10mm are provided to increase the contact area between the discharge electrode and the air. Wherein the direct distance between the discharge electrode and the dust collecting electrode plate is 250-600cm. The dust-collecting electrode plate may be cylindrical, and the discharge electrode is placed at the center of the cylindrical dust-collecting electrode plate. In addition, the distance between adjacent dust-collecting electrode plates is 400-700 mm. Wherein, the voltage between the dust-collecting electrode plate and the discharge electrode is 40,000-60,000 volts. A heat exchanger 2 is provided at the air outlet end of the secondary electrostatic precipitator tower 3 . The high-temperature exhaust flue gas passes through the heat exchanger and then enters the treatment tower through the flue gas inlet for treatment. The residual heat of the exhaust flue gas heats the purified airflow to separate the water and gas.

Example 2

The integrated wet electrostatic dedusting desulfurization and denitrification system, as shown in Figure 2, on the basis of Example 1, preferably, the humidification treatment chamber 11 is arranged in stages, and the humidification treatment chamber 11 passes through the auxiliary filter packing layer 14 is divided into at least two sub-humidification treatment chambers (first-level sub-humidification treatment chamber 111 and second-level sub-humidification treatment chamber 112). The spraying device 43 is respectively arranged in the first-level sub-humidification treatment chamber 111 and the second-level sub-humidification treatment chamber 112 . The flue gas is sprayed through the primary humidification treatment chamber first, filtered through the auxiliary filter packing layer 14, and then enters the secondary humidification treatment chamber for spray treatment, then humidified through the filter packing layer 13, and then enters the electrostatic precipitator chamber 12 for dust removal treatment .

The thickness of the auxiliary filter packing layer 14 is 12-30 cm, which is fixed on the side wall of the treatment tower 1 . Pall rings are filled in the auxiliary filter packing layer 14 . Using the Pall ring can effectively save 20%-40% of packing volume. Most preferably, the thickness of the filter packing layer 13 is 15-25 cm.

Example 3

The integrated wet electrostatic dedusting desulfurization and denitrification system, as shown in Figure 3 and Figure 4, on the basis of Embodiment 1, preferably, the flue gas inlet of the treatment tower 1 and the humidification treatment chamber 11 are directly provided with The air equalizing partition 6 is used to disperse the flue gas flow, so that it is evenly distributed in the chamber of the humidification treatment chamber 11 to receive the treatment liquid spray, so that the effect of desulfurization and nitrogen removal is more obvious. The air equalizing partition 6 includes a base plate, on which several air equalizing holes 61 are arranged. The air equalizing holes 61 include main air outlet holes and auxiliary fine holes uniformly arranged in four directions of the main main air outlet holes, so as to facilitate the passage of smoke and prevent the downstream treatment liquid from blocking the air equalizing holes.

Example 4

The integrated wet electrostatic dedusting desulfurization and denitrification system, as shown in Figure 5, includes a treatment tower 1, the humidification treatment chamber 11 is filled with a desulfurization treatment liquid, and the treatment tower 1 is provided with a desulfurization treatment liquid inlet 113 and a desulfurization treatment liquid. The treatment liquid discharge port 114, the desulfurization treatment liquid inlet 113 and the desulfurization treatment liquid discharge port 114 are connected to the humidification treatment chamber 11, the humidification treatment chamber 11 is equipped with an air duct 71, and the air duct 71 is installed There are several wind caps 72, the air outlets of the wind caps 72 are arranged on the side walls of the wind caps and arranged in a downward slope, the air ducts 71 and the wind caps 72 are soaked in the desulfurization treatment liquid, and the air ducts 71 communicate with all The flue gas inlet, the air duct 71 is equipped with a one-way valve 73 to prevent the desulfurization treatment liquid from flowing out of the flue gas inlet. The flue gas enters the air duct from the flue gas inlet, and then emerges evenly from the hood, and is bathed by the treatment liquid, which can greatly remove sulfides and nitrogen oxides.

The above are only preferred embodiments of the present invention, and should not limit the scope of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the description of the invention are all Still belong to the scope that the patent of the present invention covers.

Claims (10)

1. An integrated wet electrostatic dedusting desulfurization and denitrification system, comprising a treatment tower, characterized in that at least one humidification treatment chamber and electrostatic dust removal chamber are arranged in sequence from bottom to top in the treatment tower, and the humidification treatment chamber and The electrostatic precipitator chambers are separated by filter packing layers; a first electrostatic precipitator and a first spray device are arranged in the electrostatic precipitator chamber, and the first spray device is installed above the first electrostatic precipitator ; The processing tower is provided with a flue gas inlet and a gas outlet, the flue gas inlet is connected to the humidification treatment chamber, and the gas outlet is connected to the electrostatic precipitator chamber. 2. The integrated wet electrostatic dedusting desulfurization and denitrification system according to claim 1, characterized in that, a second spray device is provided on the humidification treatment chamber, and a treatment liquid pool is provided at the bottom of the treatment tower, The second spraying device is connected to the treatment liquid pool through a water pump through a delivery pipe; the first spraying device or the second spraying device includes a spiral coil pipe arranged in the electrostatic dust removal chamber or humidification treatment chamber, Several shower heads are arranged on the spiral coil pipe. 3. The integrated wet electrostatic dedusting desulfurization and denitrification system according to claim 2, characterized in that, the humidification treatment chamber is arranged in stages, and the humidification treatment chamber is divided into at least two sub-humidification chambers by an auxiliary filter packing layer Processing chamber: the second spraying device is respectively set in the first-level sub-humidification treatment chamber and the second-level sub-humidification treatment chamber. 4. The integrated wet electrostatic dedusting desulfurization and denitrification system according to claim 3, characterized in that, the filter packing layer is filled with Raschig rings; the auxiliary filter packing layer is filled with Bauer rings. ring. 5. The integrated wet electrostatic precipitator desulfurization and denitrification system according to claim 1, further comprising a secondary electrostatic precipitator, the gas outlet of the treatment tower is connected to the secondary electrostatic precipitator through a pipeline, A second electrostatic precipitator is installed in the secondary electrostatic precipitator, and a heat exchanger is arranged at the air outlet end of the secondary electrostatic precipitator. 6. The integrated wet electrostatic precipitator desulfurization and denitrification system according to claim 5, characterized in that, the first electrostatic precipitator or the second electrostatic precipitator includes a dust collection electrode plate connected to the positive pole of the power supply and connected to the power supply Negative connection to the discharge electrode. 7. The integrated wet electrostatic precipitator desulfurization and denitrification system according to claim 6, characterized in that, the discharge electrode is provided with some burrs of irregular height, and the voltage between the dust collecting electrode plate and the discharge electrode is 40,000-60,000 volts. 8. The integrated wet electrostatic dedusting desulfurization and denitrification system according to claim 1, characterized in that a flow equalization device is installed in the gas outlet of the treatment tower, and the flow equalization device includes several arranged The corrugated curved plates form a tortuous flow equalizing air passage between adjacent corrugated curved plates. 9. The integrated wet electrostatic dedusting desulfurization and denitrification system according to claim 1, characterized in that, the flue gas inlet of the treatment tower and the humidification treatment chamber are directly provided with an air-distributing partition, and the air-equalizing The separator includes a base plate on which several air equalization holes are arranged, and the air equalization holes include main air outlet holes and auxiliary fine holes evenly arranged in four directions of the main main air outlet holes. 10. The integrated wet electrostatic dedusting desulfurization and denitrification system according to claim 1, characterized in that, the desulfurization treatment liquid is filled in the humidification treatment chamber, and the desulfurization treatment liquid inlet and the desulfurization treatment liquid are provided on the treatment tower. The desulfurization treatment liquid inlet and the desulfurization treatment liquid discharge port are connected to the humidification treatment chamber. An air duct is installed in the humidification treatment chamber, and several air caps are installed on the air duct. The air duct and The air cap is soaked in the desulfurization treatment liquid, the air duct is connected to the flue gas inlet, and a one-way valve is installed on the air duct to prevent the desulfurization treatment liquid from flowing out of the flue gas inlet.