CN209378749U - Flue gas dewhitening treatment device - Google Patents

Abstract

A flue gas dewhitening treatment device belongs to the technical field of environmental treatment. The utility model aims to solve the problem that the existing industrial waste gas has poor dewhitening treatment effect and affects the environment. The utility model comprises a tower body and a tower base, the tower body is a circular tower body, the lower end of the tower body is installed on the tower base, the side wall of the tower body has a smoke inlet pipe and a liquid discharge pipe, and the top of the tower body has a gas At the outlet, the inner layer of the tower body is arranged with a flue gas spraying layer, a flue gas dehydration and demisting layer, and a flue gas adsorption layer in sequence from bottom to top. A flue gas spraying device is installed in the flue gas spraying layer, and the flue gas dehydration A flue gas defogging device is installed in the fog layer, and a flue gas adsorption device is installed in the flue gas adsorption layer. After being treated by the gas spraying device, the flue gas demisting device and the flue gas adsorption device, it is discharged through the gas outlet. The utility model can effectively improve the air quality and is beneficial to lighten the haze.

Description

Flue gas dewhitening treatment device

technical field

The utility model relates to a flue gas dewhitening treatment device, which belongs to the technical field of environmental treatment.

Background technique

In my country's thermal power, steel, building materials, nonferrous metals, cement, glass, petrochemical, coking and other industries, wet desulfurization processes are mostly used for flue gas desulfurization, especially limestone-gypsum and ammonia desulfurization processes. After the flue gas is purified by the desulfurization system, it will generally form a low-temperature saturated wet flue gas at 45-55°C. The wet flue gas is directly discharged into the atmosphere through the chimney. Due to the temperature drop, part of the gaseous water will soon condense into liquid with the pollutants in the flue gas (dust, SO ₃ aerosol, NH ₃ aerosol, gypsum slurry, etc.) Drops, forming a mist of water vapor around the chimney. Scattering occurs under sunlight, forming what is often called a "colored plume". Under different viewing angles, it generally appears white, off-white, blue or yellow. In severe cases, it will form gypsum rain or ammonia escape nearby.

At present, while promoting ultra-low emissions in thermal power and non-electric fields in various places, the control of "colored plume" has been included in local environmental protection policies.

The colored smoke plume will cause troubles to the lives of the surrounding residents, and the Environmental Protection Agency often receives similar complaints. Therefore, many enterprises equipped with wet flue gas desulfurization devices regard the elimination of "white plume" as one of the important contents of ultra-low emission transformation. Guodian Environmental Protection Research Institute surveyed 95 thermal power plants across the country, involving 235 units. Of the 122 chimneys investigated, 107 had wet plumes, accounting for 88%. Power plants that did not have wet plumes mostly used semi-dry chimneys. desulfurization, flue gas heating technology or "tower integration" technology.

Generally speaking, after desulfurization, denitrification and dust removal, the flue gas has reached the emission standard required by the state, but the droplets of the colored plume still carry nitrogen oxides, sulfides, various soot particles, SO ₃ aerosols, Pollutants such as NH ₃ aerosol and ultrafine crystalline salt particles are dewhitened for flue gas. While removing most of the fog droplets, it can also remove a large number of pollutants, which is conducive to reducing smog.

Utility model content

The utility model provides a flue gas whitening treatment device aiming at the above-mentioned deficiencies in the prior art. A brief overview of the present invention is given below in order to provide a basic understanding of certain aspects of the present invention. It should be understood that this summary is not an exhaustive summary of the invention. It is not intended to identify the key or important part of the present invention, nor is it intended to limit the scope of the present invention.

Technical scheme of the utility model:

The flue gas dewhitening treatment device includes a tower body and a tower base. The tower body is a circular tower body. The lower end of the tower body is installed on the tower base. There are flue gas inlet pipes and liquid discharge pipes on the side walls of the tower body. The top of the tower has a gas outlet, and the inner layer of the tower body is arranged in sequence from bottom to top with a smoke spray layer, a smoke dehydration and demisting layer, and a smoke adsorption layer, and a smoke spray device is installed in the smoke spray layer. A flue gas demisting device is installed in the flue gas dehydration and demisting layer, and a flue gas adsorption device is installed in the flue gas adsorption layer. The flue gas inlet pipe is connected with the flue gas spraying device, and the flue gas entering the tower body is After the gas enters the flue gas spraying device, the flue gas demisting device and the flue gas adsorption device in sequence, it is discharged through the gas outlet.

Further, the flue gas spraying device includes a flue gas circulation box, a spray pipe, a spray head and a connecting pipe, and a plurality of spray pipes are installed at the center of the interior of the flue gas circulation box, adjacent to each other. The two spray pipes are connected through the connecting pipe, the side wall of the flue gas circulation box is installed with a spray liquid connecting pipe, the spray liquid connecting pipe is connected with the connecting pipe, and the outer walls of the spray pipes are staggered A plurality of spray heads are installed, the air inlet of the flue gas circulation box communicates with the flue gas inlet pipe, and the gas outlet of the flue gas circulation box communicates with the inside of the tower body.

Further, the flue gas circulation box includes a box body and a box cover plate, the box cover plate is buckled on the box body, and the cross section of the box cover plate is bent into a compound paraboloid shape.

Further, the flue gas demisting device includes a supporting beam, a bearing seat, a transmission shaft, a driven pulley, a flue gas defogging wheel body, a rotating motor and a driving pulley, and the supporting beam is installed on the inner wall of the tower body Above, a bearing seat is installed at the center of the support beam, a drive shaft is installed inside the bearing seat, a driven pulley is installed at one end of the drive shaft, and a smoke defogging wheel body is installed at the other end of the drive shaft. A rotating motor is also installed on the outer wall of the tower body, and a driving pulley is installed on the output shaft of the rotating motor, and the driving pulley is installed by a belt and a driven pulley.

Further, the described flue gas defogging wheel body includes an upper plate, a lower plate and a wheel piece, the upper plate and the lower plate are circular plates, the upper plate and the lower plate form a mist treatment cavity, and the mist treatment cavity A bent corrugated plate is installed inside the cavity, and the upper plate is arranged with a plurality of wheels counterclockwise. The upper plate is processed with a gas flow inlet, and the lower plate is processed with a gas flow inlet. Export.

Further, the wheel includes a root of the wheel, an arc portion of the wheel and a top of the wheel, and the thickness of the wheel tends to decrease from the root of the wheel to the top of the wheel in the radial direction.

Further, the gas circulation inlet is provided between two adjacent wheels.

Further, the bottom end of the tower body is installed with an inclined deflector.

Further, the flue gas adsorption device includes a circular adsorption box, the upper and lower ends of the circular adsorption box are processed with a number of ventilation holes, and the inside of the circular adsorption box is equipped with activated carbon.

The flue gas dewhitening treatment method comprises the following steps:

Step 1. The flue gas enters the flue gas spraying device and is fully mixed and contacted with lye and undergoes a chemical reaction to remove NO ₂ , SO ₂ , HCl, HF acid gas and soluble organic gas in the flue gas;

Step 2. The flue gas processed in step 1 enters the flue gas demisting device, and the moisture in the exhaust gas is reduced through the flue gas demisting device;

Step 3. The flue gas treated in step 2 enters the flue gas adsorption device, and under the action of the flue gas adsorption device, the residual nitrogen oxides, sulfides, and various dusts entrained in the flue gas after the treatment in step 1 and step 2 are removed. Particulate matter, SO ₃ aerosol, NH ₃ aerosol, ultrafine crystalline salt particles.

Step 4: The flue gas treated in Step 3 is discharged from the gas outlet of the tower body.

The utility model has the following beneficial effects:

1. The utility model realizes flue gas dewhitening through three methods of flue gas spray treatment, mist treatment and adsorption treatment in sequence. The structure of the flue gas spray treatment device can fully mix the flue gas and lye to realize Chemical reaction to remove NO ₂ , SO ₂ , HCl, HF acid gas and soluble organic gas in flue gas;

2. The utility model has the advantages of simple and compact structure, low operation failure rate, stable and reliable operation and low cost, which is conducive to reducing the capital investment of enterprises and improving the economic benefits of enterprises;

3. The utility model can thoroughly purify the emissions of alkanes, aromatic hydrocarbons, esters, and aldehydes, effectively improving people's requirements for air quality;

4. The flue gas defogging device of the utility model can separate and recover the moisture brought into the atmosphere by the flue gas, and recover a large amount of precious water resources.

Description of drawings

Fig. 1 is the overall structural layout diagram of the utility model;

Fig. 2 is a structural schematic diagram of the flue gas spraying device;

Fig. 3 is a structural view of the flue gas demisting runner body;

Fig. 4 is a side sectional view of the flue gas demisting runner body;

Fig. 5 is a schematic diagram of the structural installation of the lower plate and the corrugated plate;

Fig. 6 is a schematic structural view of the smoke adsorption device;

In the figure: 1- tower body, 2- tower base, 3- flue gas inlet pipe, 4- liquid discharge pipe, 5- gas outlet, 6- flue gas spray layer, 7- flue gas dehydration and defogging layer, 8 - Smoke adsorption layer, 9 - smoke spraying device, 10 - smoke demisting device, 11 - smoke adsorption device, 12 - smoke circulation box, 13 - spray pipe, 14 spray head, 15 - Connecting pipe, 16-spray liquid connection pipe, 17-support beam, 18-bearing seat, 19-transmission shaft, 20-driven pulley, 21-smoke defogging wheel body, 22-rotating motor, 23-driving pulley , 24-upper plate, 25-lower plate, 26-wheel piece, 27-mist treatment cavity, 28-corrugated plate, 29-gas flow inlet, 30-gas flow outlet, 31-wheel root, 32-wheel Arc portion, 33-wheel top, 34-deflector, 35-circular adsorption box, 36-air vent, 121-box body, 122-box cover plate.

Detailed ways

Specific Embodiment 1: This embodiment is described in conjunction with FIGS. 1-6 . The flue gas dewhitening treatment device of this embodiment includes a tower body 1 and a tower base 2. The tower body 1 is a circular tower body. The lower end of the tower body 1 Installed on the tower base 2, the side wall of the tower body 1 has a flue gas inlet pipe 3 and a liquid discharge pipe 4, the top of the tower body 1 has a gas outlet 5, and the inner layer of the tower body 1 is arranged in sequence from bottom to top. Gas spraying layer 6, flue gas dehydration and defogging layer 7 and flue gas adsorption layer 8, flue gas spraying device 9 is installed in the flue gas spraying layer 6, and flue gas demisting is installed in the flue gas dehydration and defogging layer 7 Device 10, a smoke adsorption device 11 is installed in the smoke adsorption layer 8, the smoke gas inlet pipe 3 communicates with the smoke gas spraying device 9, and the flue gas entering the tower body 1 through the smoke gas inlet pipe 3 enters the flue gas in sequence After being treated by the spraying device 9 , the flue gas demisting device 10 and the flue gas adsorption device 11 , it is discharged through the gas outlet 5 . In this way, the flue gas discharged from the industry enters the tower body 1 through the flue gas inlet pipe 3, and is sprayed by the flue gas spraying device 9, so that acid gases such as NO ₂ , SO ₂ , HCl, HF in the flue gas and The soluble organic gas reacts chemically with the treatment liquid (lye) sprayed by the flue gas spraying device 9 to remove harmful substances, and the treated flue gas is discharged from the flue gas spraying device 9 and enters the flue gas dehydration and defogging layer 7 In the flue gas demisting device 10, the separation of flue gas and moisture is realized, and the flue gas inside the exhaust air is effectively reduced to be mixed with a large amount of water. After the dehydration treatment, the flue gas then enters the flue gas adsorption layer 8 and passes through the flue gas After the adsorption treatment by the adsorption device 11, pollutants doped in the flue gas such as dust, SO ₃ aerosol, NH ₃ aerosol, and gypsum slurry are removed, thereby realizing the dewhitening treatment of the flue gas.

Specific embodiment two: this embodiment is described in conjunction with Fig. 1-Fig. The shower head 14 and the communication pipe 15. A plurality of shower pipes 13 are installed in the center of the flue gas circulation box 12. Two adjacent spray pipes 13 are connected through the communication pipe 15. The flue gas The side wall of the circulation box 12 is installed with a spray liquid connection pipe 16, which establishes communication with the communication pipe 15, and the outer wall of the spray pipe 13 is staggered with a plurality of spray heads 14, so that the smoke flows The air inlet of the box body 12 communicates with the flue gas inlet pipe 3 , and the gas outlet of the flue gas circulation box body 12 communicates with the inside of the tower body 1 . In this way, in order to fully explain the installation of the flue gas circulation box 12 and the spray pipe 13, this embodiment makes the following description:

First, the flue gas circulation box 12 is a circular box, and the side wall of the flue gas circulation box 12 is welded and fixed on the inner wall of the tower body 1 by welding; secondly, the spray pipe 13 is welded to the flue gas circulation box 12 and the adjacent spray pipe 12 communicates through the communication pipe 15, the communication pipe 15 and the spray liquid connection pipe 16, when the treatment liquid is sprayed, the treatment liquid is pumped by the pump outside the tower body 1 Extract it into the spray pipe 13 and pressurize it to realize the spray operation;

In order to further illustrate the second embodiment, as shown in Figure 1, the arrangement of the flue gas circulation box 12 in the tower body is an inclined arrangement, which facilitates the flow of flue gas in the flue gas circulation box 12. At the same time, the flow velocity of the flue gas is slowed down by an inclined method, and the contact time between the flue gas and the treatment liquid is increased, so that the harmful substances mixed in the flue gas can fully contact with the lye sprayed from the spray pipe, and the Realize chemical reaction and remove harmful impurities in flue gas.

Specific embodiment three: this embodiment is described in conjunction with Fig. 1-Fig. Buckled on the box body 121, the cross section of the box cover plate 122 is bent into a compound paraboloid shape. So set, the cross-section of the box cover plate 122 adopts the advantages of being bent into a compound paraboloid shape design as follows:

1. After the flue gas enters the flue gas circulation box 12, under the action of the compound parabolic-shaped box cover 122, the flue gas is gathered around the spray pipe 13, and after the spray pipe 13 sprays the treatment liquid, the flue gas It can fully contact and react with the treatment liquid, which increases the treatment effect of harmful gases in the flue gas and saves treatment time;

2. Since the tank cover 122 adopts a compound paraboloid shape, a diversion groove structure is also formed on the top of the tank cover 122, so that the water droplets after the separation of moisture in the flue gas by the flue gas demisting device 10 are scattered on the tank. The top of the cover plate 122 is beneficial for water droplets to flow to the bottom of the tower body 1 along the diversion groove formed on the top of the tank cover plate 122 .

Specific Embodiment Four: This embodiment is described in conjunction with Fig. 1-Fig. The moving pulley 20, the smoke demisting wheel body 21, the rotating motor 22 and the driving pulley 23, the support beam is installed on the inner wall of the tower body 1, and the center position of the support beam 17 is equipped with a bearing seat 18. A transmission shaft 19 is installed inside the bearing seat 18, a driven pulley 20 is installed on one end of the transmission shaft 19, and a smoke defogging runner body 21 is installed on the other end of the transmission shaft 19, and the outer wall of the tower body 1 is also installed There is a rotating motor 22, a driving pulley 23 is installed on the output shaft of the rotating motor 22, and the driving pulley 23 is installed with the driven pulley 20 through a belt; the described smoke demist runner body 21 includes an upper plate 24 and a lower plate 25 And the wheel 26, the upper plate 24 and the lower plate 25 are circular plates, the upper plate 24 and the lower plate 25 form a mist treatment cavity 27, and the inside of the mist treatment cavity 27 is equipped with a bent corrugated plate 28, The upper plate 24 is provided with a plurality of wheels 26 counterclockwise, the upper plate 24 is processed with a gas circulation inlet 29 , and the lower plate 25 is processed with a gas circulation outlet 30 . In such a setting, an air passage is formed between two adjacent wheels 26, which facilitates the passage of the flue gas after spraying treatment, and at the same time adopts the structural design of the wheel-type flue gas demisting runner body 21. The advantages are as follows:

1. The wheel piece 26 can increase the gas swirl in the tower body 1, thereby increasing the efficiency of moisture separation in the flue gas;

2. The wheel 26 can increase the hitting area of the mist mixed in the flue gas after the spray treatment, and the hit mist forms water droplets on the wheel, and falls to the bottom of the tower body 1, and then passes through the liquid Discharge pipe 4 discharges;

3. A gas circulation outlet 30 is processed on the body of the lower plate 26. The flue gas passing through the wheel 26 enters the inside of the mist treatment cavity 27, and under the action of the rotation of the flue gas demisting runner body 21, the flue gas is mixed with Miscellaneous mist water is continuously combined under the continuous impact of the corrugated plate 22 to form water droplets, and flows into the tower again along the wheel blade 26, thereby realizing the dehydration treatment of the flue gas.

Specific embodiment five: This embodiment is described in conjunction with Fig. 1-Fig. 6, the flue gas dewhitening treatment device of this embodiment, the wheel 26 includes the root 31 of the wheel, the arc portion 32 of the wheel and the top 33 of the wheel , the thickness of the wheel shows a thinning trend from the root 31 of the wheel to the top 33 of the wheel along the radial direction. Set in this way, the wheel 26 includes the root 31, the arc 32 and the top 33 of the wheel. The structural design of the wheel 26 can realize the full contact and impact of the gas into the liquid, and the water droplets formed after the impact It can flow into the tower again along the wheel blade 26, which is convenient for the recycling of liquid water.

Embodiment 6: This embodiment is described with reference to FIGS. 1-6 . In the flue gas dewhitening treatment device of this embodiment, the gas circulation inlet 29 is provided between two adjacent wheel pieces 26 .

Embodiment 7: This embodiment is described with reference to FIGS. 1-6 . In the flue gas dewhitening treatment device of this embodiment, an oblique deflector 34 is installed at the bottom of the tower body 1 . So set, the role of the inclined deflector 34 at the bottom of the tower is to have a guiding effect, to facilitate the detached water to flow toward the discharge port, and to improve the discharge speed and discharge effect.

Embodiment 8: This embodiment is described in conjunction with FIGS. 1-6 . The flue gas dewhitening treatment device of this embodiment, the flue gas adsorption device 11 includes a circular adsorption box 35, and the upper and lower end surfaces of the circular adsorption box 35 Processing has some ventilation holes 36, and the inside of circular adsorption box 35 is equipped with gac. So set, the inside of the circular adsorption box 35 is equipped with activated carbon, which can absorb the dust, SO3 aerosol, _{NH3 aerosol} , gypsum slurry and other residual pollutants that affect the air quality that are still mixed in the flue gas after treatment.

Ninth specific embodiment: This embodiment is described in conjunction with Figures 1-6. The flue gas dewhitening treatment device and the flue gas dewhitening treatment method of this embodiment include the following steps:

Step 1. The flue gas enters the flue gas spraying device 9 and is fully mixed and contacted with lye and undergoes a chemical reaction to remove NO ₂ , SO ₂ , HCl, HF acid gas and soluble organic gas in the flue gas;

Step 2, the flue gas processed in step 1 enters the flue gas demisting device 10, and the moisture in the exhausted smoke is reduced through the flue gas demisting device 10;

Step 3: The flue gas treated in step 2 enters the flue gas adsorption device 11, and under the action of the flue gas adsorption device 11, the residual nitrogen oxides, sulfides, and various A variety of soot particles, SO ₃ aerosol, NH ₃ aerosol, ultrafine crystalline salt particles.

Step 4: The flue gas treated in Step 3 is discharged from the gas outlet 5 of the tower body 1 .

This embodiment is only an exemplary description of this patent, and does not limit its protection scope. Those skilled in the art can also make partial changes to it, as long as it does not exceed the spirit and essence of this patent, all within the protection scope of this patent.

Claims (9)

1. flue gas takes off white processing unit, it is characterised in that: including tower body (1) and tower seat (2), tower body (1) is round tower body, tower body (1) lower end is mounted on tower seat (2), on the side wall of tower body (1) there is flue gas to enter tracheae (3) and liquid discharge tube (4), tower body (1) top has gas discharge outlet (5), and the internal layer of tower body (1) has been sequentially arranged flue gas spraying layer (6), flue gas from the bottom to top Dehydrating demisting layer (7) and flue gas adsorption layer (8), flue gas spraying layer (6) is interior to be equipped with flue gas spray equipment (9), and fume-dehydrating removes It is equipped with flue gas demister (10) in mist layer (7), flue gas adsorption device (11) is installed in flue gas adsorption layer (8), flue gas enters Tracheae (3) is connected to flue gas spray equipment (9), is entered the flue gas that tracheae (3) enters in tower body (1) via flue gas and is sequentially entered cigarette After gas blowout shower device (9), flue gas demister (10) and flue gas adsorption device (11) processing, it is discharged by gas discharge outlet (5).

2. flue gas according to claim 1 takes off white processing unit, it is characterised in that: flue gas spray equipment (9) packet Flue gas circulation cabinet (12), spray tube (13), spray head (14) and communicating pipe (15) are included, flue gas circulation cabinet (12) is interior Portion center is equipped with multiple spray tubes (13), and two adjacent spray tubes (13) establish connection, institute by communicating pipe (15) Spray liquid adapter tube (16) is installed, spray liquid adapter tube (16) is built with communicating pipe (15) on the side wall for flue gas circulation cabinet (12) stated Vertical connection, the outer wall of the spray tube (13) are interleaved and installed with multiple spray heads (14), the air inlet of flue gas circulation cabinet (12) Mouth enters tracheae (3) with flue gas and is connected to, and is connected to inside the gas outlet of flue gas circulation cabinet (12) and tower body (1).

3. flue gas according to claim 2 takes off white processing unit, it is characterised in that: flue gas circulation cabinet (12) packet Case ontology (121) and cover plate (122) are included, cover plate (122) spiral-lock is on case ontology (121), the cross section of cover plate (122) Using bending to composite parabolic shape.

4. flue gas according to claim 1 takes off white processing unit, it is characterised in that: flue gas demister (10) packet Include supporting beam (17), bearing block (18), transmission shaft (19), driven pulley (20), flue gas demisting web (21), rotary electric machine (22) it is mounted on the inner wall of tower body (1) with drive pulley (23), the supporting beam, the center peace of supporting beam (17) Is equipped with transmission shaft (19) equipped with bearing block (18), inside the bearing block (18), one end of transmission shaft (19) be equipped with from Dynamic belt pulley (20), the other end of transmission shaft (19) are equipped with flue gas demisting web (21), on the tower body (1) lateral wall It is also equipped with rotary electric machine (22), drive pulley (23), drive pulley is installed on the output shaft of rotary electric machine (22) (23) it is established and is installed by belt and driven pulley (20).

5. flue gas according to claim 4 takes off white processing unit, it is characterised in that: the flue gas demisting web (21) Including upper plate (24), lower plate (25) and wheel piece (26), upper plate (24) and lower plate (25) are round plate body, upper plate (24) and lower plate (25) fog processing cavity (27) is formed, the corrugated plating (28) of bending-like, institute are installed inside fog processing cavity (27) In multiple wheel pieces (26) are disposed with counterclockwise on the upper plate (24) stated, gas circulation entrance is machined on the plate body of upper plate (24) (29), gas flow outlets (30) are machined on the plate body of lower plate (25).

6. flue gas according to claim 5 takes off white processing unit, it is characterised in that: the wheel piece (26) includes wheel piece root At the top of portion (31), wheel piece curved portion (32) and wheel piece (33), the thickness of piece is taken turns radially from wheel piece root (31) to wheel piece Top (33) is in the trend that is thinned.

7. flue gas according to claim 5 takes off white processing unit, it is characterised in that: gas circulation entrance (29) is set Between two neighboring wheel piece (26).

8. flue gas according to claim 1 or 4 takes off white processing unit, it is characterised in that: pacify the bottom end of the tower body (1) Equipped with a deflector being obliquely installed (34).

9. flue gas according to claim 1 takes off white processing unit, it is characterised in that: flue gas adsorption device (11) packet It includes round adsorption box (35), the upper and lower end face of round adsorption box (35) is machined with several ventholes (36), round adsorption box (35) Inside be equipped with active carbon.